aead: extract AeadCore trait#508

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tarcieri merged 1 commit into from
Jan 30, 2021
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aead: extract AeadCore trait #508

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124 changes: 44 additions & 80 deletions aead/src/lib.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
}
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
/// The length of a nonce.
type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
/// The upper bound amount of additional space required to support a
/// ciphertext vs. a plaintext.
type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
/// Encrypt the given plaintext payload, and return the resulting
/// ciphertext as a vector of bytes.
///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
/// ciphertext message.
fn encrypt<'msg, 'aad>(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
plaintext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
/// ciphertext message.
fn decrypt<'msg, 'aad>(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
ciphertext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
/// The length of a nonce.
type NonceSize: ArrayLength<u8>;

/// The maximum length of the nonce.
type TagSize: ArrayLength<u8>;

/// The upper bound amount of additional space required to support a
/// ciphertext vs. a plaintext.
type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
/// Encrypt the given plaintext slice, and return the resulting ciphertext
/// as a vector of bytes.
///
/// See notes on [`Aead::encrypt()`] about allowable message payloads and
/// Associated Additional Data (AAD).
fn encrypt<'msg, 'aad>(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
plaintext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
/// message payloads and Associated Additional Data (AAD).
fn decrypt<'msg, 'aad>(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
ciphertext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

let tag_pos = $buffer.len() - Self::TagSize::to_usize();
let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
$aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
$aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
$buffer.truncate(tag_pos);
Ok(())
}};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
/// The length of a nonce.
type NonceSize: ArrayLength<u8>;

/// The maximum length of the nonce.
type TagSize: ArrayLength<u8>;

/// The upper bound amount of additional space required to support a
/// ciphertext vs. a plaintext.
type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
/// Encrypt the given buffer containing a plaintext message in-place.
///
/// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
/// resulting ciphertext message.
fn encrypt_in_place(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut dyn Buffer,
) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
/// Encrypt the data in-place, returning the authentication tag
fn encrypt_in_place_detached(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
) -> Result<Tag<Self::TagSize>, Error>;
) -> Result<Tag<Self>, Error>;

/// Decrypt the message in-place, returning an error in the event the
/// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
/// message upon success.
fn decrypt_in_place(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut dyn Buffer,
) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
/// is modified/unauthentic)
fn decrypt_in_place_detached(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
tag: &Tag<Self::TagSize>,
tag: &Tag<Self>,
) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
/// The length of a nonce.
type NonceSize: ArrayLength<u8>;

/// The maximum length of the nonce.
type TagSize: ArrayLength<u8>;

/// The upper bound amount of additional space required to support a
/// ciphertext vs. a plaintext.
type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
/// Encrypt the given buffer containing a plaintext message in-place.
///
/// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
/// resulting ciphertext message.
fn encrypt_in_place(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut impl Buffer,
) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
/// Encrypt the data in-place, returning the authentication tag
fn encrypt_in_place_detached(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
) -> Result<Tag<Self::TagSize>, Error>;
) -> Result<Tag<Self>, Error>;

/// Decrypt the message in-place, returning an error in the event the
/// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
/// message upon success.
fn decrypt_in_place(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut impl Buffer,
) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
/// is modified/unauthentic)
fn decrypt_in_place_detached(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
tag: &Tag<Self::TagSize>,
tag: &Tag<Self>,
) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
type NonceSize = Alg::NonceSize;
type TagSize = Alg::TagSize;
type CiphertextOverhead = Alg::CiphertextOverhead;

fn encrypt<'msg, 'aad>(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
plaintext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error> {
let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

fn decrypt<'msg, 'aad>(
&self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
ciphertext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error> {
let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
type NonceSize = Alg::NonceSize;
type TagSize = Alg::TagSize;
type CiphertextOverhead = Alg::CiphertextOverhead;

fn encrypt<'msg, 'aad>(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
plaintext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error> {
let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

fn decrypt<'msg, 'aad>(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
ciphertext: impl Into<Payload<'msg, 'aad>>,
) -> Result<Vec<u8>, Error> {
let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
type NonceSize = Alg::NonceSize;
type TagSize = Alg::TagSize;
type CiphertextOverhead = Alg::CiphertextOverhead;

fn encrypt_in_place(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut impl Buffer,
) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

fn encrypt_in_place_detached(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
) -> Result<Tag<Self::TagSize>, Error> {
) -> Result<Tag<Self>, Error> {
<Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
}

fn decrypt_in_place(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut impl Buffer,
) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

fn decrypt_in_place_detached(
&mut self,
nonce: &Nonce<Self::NonceSize>,
nonce: &Nonce<Self>,
associated_data: &[u8],
buffer: &mut [u8],
tag: &Tag<Self::TagSize>,
tag: &Tag<Self>,
) -> Result<(), Error> {
<Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
}
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aead: extract AeadCore trait#508

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 Merged

tarcieri
merged 1 commit into

from

Jan 30, 2021
 Merged


aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
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aead: extract AeadCore trait#508

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aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
Expand Down
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aead: extract AeadCore trait#508

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tarcieri
merged 1 commit into

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Jan 30, 2021
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aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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aead: extract AeadCore trait#508

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merged 1 commit into

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Jan 30, 2021
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aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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aead: extract AeadCore trait#508

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privacy statement. We’ll occasionally send you account related emails.

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 Merged

tarcieri
merged 1 commit into

from

Jan 30, 2021
 Merged


aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
Expand Down
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tarcieri
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Jan 30, 2021
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aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
Expand Down
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style = document.createElement('style');
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background: #2d2d44 !important;
border-color: #444 !important;
}
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::-webkit-scrollbar { background: #1a1a2e !important; }
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/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
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aead: extract AeadCore trait#508

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tarcieri
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Jan 30, 2021
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aead: extract AeadCore trait
#508
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124 changes: 44 additions & 80 deletions
aead/src/lib.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -68,10 +68,10 @@ impl std::error::Error for Error {}
pub type Key<A> = GenericArray<u8, <A as NewAead>::KeySize>;

/// Nonce: single-use value for ensuring ciphertexts are unique
pub type Nonce<NonceSize> = GenericArray<u8, NonceSize>;
pub type Nonce<A> = GenericArray<u8, <A as AeadCore>::NonceSize>;

/// Tag: authentication code which ensures ciphertexts are authentic
pub type Tag<TagSize> = GenericArray<u8, TagSize>;
pub type Tag<A> = GenericArray<u8, <A as AeadCore>::TagSize>;

/// Instantiate either a stateless [`Aead`] or stateful [`AeadMut`] algorithm.
pub trait NewAead {
Expand All@@ -96,13 +96,11 @@ pub trait NewAead {
 }
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
/// Authenticated Encryption with Associated Data (AEAD) algorithm core trait.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead {
/// Defines nonce, tag, and overhead sizes that are consumed by various other
/// `Aead*` traits.
pub trait AeadCore {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

Expand All@@ -112,7 +110,15 @@ pub trait Aead {
 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;
}

/// Authenticated Encryption with Associated Data (AEAD) algorithm.
///
/// This trait is intended for use with stateless AEAD algorithms. The
/// [`AeadMut`] trait provides a stateful interface.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait Aead: AeadCore {
 /// Encrypt the given plaintext payload, and return the resulting
 /// ciphertext as a vector of bytes.
 ///
Expand All@@ -138,7 +144,7 @@ pub trait Aead {
 /// ciphertext message.
 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -161,33 +167,23 @@ pub trait Aead {
 /// ciphertext message.
 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}

/// Stateful Authenticated Encryption with Associated Data algorithm.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub trait AeadMut {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMut: AeadCore {
 /// Encrypt the given plaintext slice, and return the resulting ciphertext
 /// as a vector of bytes.
 ///
 /// See notes on [`Aead::encrypt()`] about allowable message payloads and
 /// Associated Additional Data (AAD).
 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;

Expand All@@ -198,7 +194,7 @@ pub trait AeadMut {
 /// message payloads and Associated Additional Data (AAD).
 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error>;
}
Expand All@@ -216,7 +212,7 @@ macro_rules! impl_decrypt_in_place {

 let tag_pos = $buffer.len() - Self::TagSize::to_usize();
 let (msg, tag) = $buffer.as_mut().split_at_mut(tag_pos);
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::from_slice(tag))?;
 $aead.decrypt_in_place_detached($nonce, $aad, msg, Tag::<Self>::from_slice(tag))?;
 $buffer.truncate(tag_pos);
 Ok(())
 }};
Expand All@@ -225,17 +221,7 @@ macro_rules! impl_decrypt_in_place {
/// In-place stateless AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -247,7 +233,7 @@ pub trait AeadInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -259,10 +245,10 @@ pub trait AeadInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -271,7 +257,7 @@ pub trait AeadInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut dyn Buffer,
 ) -> Result<(), Error> {
Expand All@@ -283,27 +269,17 @@ pub trait AeadInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

/// In-place stateful AEAD trait.
///
/// This trait is both object safe and has no dependencies on `alloc` or `std`.
pub trait AeadMutInPlace {
 /// The length of a nonce.
 type NonceSize: ArrayLength<u8>;

 /// The maximum length of the nonce.
 type TagSize: ArrayLength<u8>;

 /// The upper bound amount of additional space required to support a
 /// ciphertext vs. a plaintext.
 type CiphertextOverhead: ArrayLength<u8> + Unsigned;

pub trait AeadMutInPlace: AeadCore {
 /// Encrypt the given buffer containing a plaintext message in-place.
 ///
 /// The buffer must have sufficient capacity to store the ciphertext
Expand All@@ -315,7 +291,7 @@ pub trait AeadMutInPlace {
 /// resulting ciphertext message.
 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -327,10 +303,10 @@ pub trait AeadMutInPlace {
 /// Encrypt the data in-place, returning the authentication tag
 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error>;
 ) -> Result<Tag<Self>, Error>;

 /// Decrypt the message in-place, returning an error in the event the
 /// provided authentication tag does not match the given ciphertext.
Expand All@@ -339,7 +315,7 @@ pub trait AeadMutInPlace {
 /// message upon success.
 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -351,22 +327,18 @@ pub trait AeadMutInPlace {
 /// is modified/unauthentic)
 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error>;
}

#[cfg(feature = "alloc")]
impl<Alg: AeadInPlace> Aead for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -378,7 +350,7 @@ impl<Alg: AeadInPlace> Aead for Alg {

 fn decrypt<'msg, 'aad>(
 &self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -390,13 +362,9 @@ impl<Alg: AeadInPlace> Aead for Alg {

#[cfg(feature = "alloc")]
impl<Alg: AeadMutInPlace> AeadMut for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 plaintext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = plaintext.into();
Expand All@@ -408,7 +376,7 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {

 fn decrypt<'msg, 'aad>(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 ciphertext: impl Into<Payload<'msg, 'aad>>,
 ) -> Result<Vec<u8>, Error> {
 let payload = ciphertext.into();
Expand All@@ -419,13 +387,9 @@ impl<Alg: AeadMutInPlace> AeadMut for Alg {
}

impl<Alg: AeadInPlace> AeadMutInPlace for Alg {
 type NonceSize = Alg::NonceSize;
 type TagSize = Alg::TagSize;
 type CiphertextOverhead = Alg::CiphertextOverhead;

 fn encrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -434,16 +398,16 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn encrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 ) -> Result<Tag<Self::TagSize>, Error> {
 ) -> Result<Tag<Self>, Error> {
 <Self as AeadInPlace>::encrypt_in_place_detached(self, nonce, associated_data, buffer)
 }

 fn decrypt_in_place(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut impl Buffer,
 ) -> Result<(), Error> {
Expand All@@ -452,10 +416,10 @@ impl<Alg: AeadInPlace> AeadMutInPlace for Alg {

 fn decrypt_in_place_detached(
 &mut self,
 nonce: &Nonce<Self::NonceSize>,
 nonce: &Nonce<Self>,
 associated_data: &[u8],
 buffer: &mut [u8],
 tag: &Tag<Self::TagSize>,
 tag: &Tag<Self>,
 ) -> Result<(), Error> {
 <Self as AeadInPlace>::decrypt_in_place_detached(self, nonce, associated_data, buffer, tag)
 }
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