RustCrypto: Formats 
Cryptography-related format encoders/decoders (e.g. PKCS, PKIX)
| Name | crates.io | Docs | Description |
|---|---|---|---|
base16ct |  |  | Constant-time hexadecimal encoder/decoder |
base32ct |  |  | Constant-time Base32 encoder/decoder |
base64ct |  |  | Constant-time Base64 encoder/decoder with support for several variants |
cms |  |  | Implementation of the Cryptographic Message Syntax (CMS) as described in RFC 5652, RFC 5911, and in RFC 3274. |
const‑oid |  |  | Const-friendly implementation of the ISO/IEC Object Identifier (OID) standard as defined in ITU X.660 |
der |  |  | Decoder and encoder of the Distinguished Encoding Rules (DER) for Abstract Syntax Notation One (ASN.1) as described in ITU X.690 |
pem‑rfc7468 |  |  | Strict PEM encoding for PKIX/PKCS/CMS objects |
pkcs1 |  |  | Implementation of PKCS#1: RSA Cryptography Specifications Version 2.2 (RFC 8017) |
pkcs5 |  |  | Implementation of PKCS#5: Password-Based Cryptography Specification Version 2.1 (RFC 8018) |
pkcs7 |  |  | Implementation of PKCS#7: Cryptographic Message Syntax v1.5 (RFC 5652 and RFC 8933) 🚨 Deprecated in favor of cms |
pkcs8 |  |  | Implementation of PKCS#8(v2): Private-Key Information Syntax Specification (RFC 5208) and asymmetric key packages (RFC 5958) |
pkcs10 |  |  | Implementation of PKCS#10: Certification Request Syntax Specification (RFC 2986) |
sec1 |  |  | SEC1: Elliptic Curve Cryptography encoding formats |
spki |  |  | X.509 Subject Public Key Info (RFC 5280 Section 4.1) describing public keys as well as their associated AlgorithmIdentifiers (i.e. OIDs) |
tai64 |  |  | TAI64(N) Timestamps |
tls_codec |  |  | TLS codec as defined in RFC 8446 Section 3 as well as some extensions required by MLS. |
x509-cert |  |  | X.509 Public Key Infrastructure Certificate format as described in RFC 5280 |
All crates licensed under either of
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