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elliptic-curve: add sec1::EncodedPoint::identity()#408

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Merged
tarcieri merged 1 commit into from
Dec 17, 2020
Merged

elliptic-curve: add sec1::EncodedPoint::identity()#408

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14 changes: 14 additions & 0 deletions elliptic-curve/src/sec1.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -143,6 +143,12 @@ where
.to_encoded_point(compress)
}

/// Return [`EncodedPoint`] representing the additive identity
/// (a.k.a. point at infinity)
pub fn identity() -> Self {
Self::from_bytes(&[0]).unwrap()
}

/// Get the length of the encoded point in bytes
pub fn len(&self) -> usize {
self.tag().message_len(C::FieldSize::to_usize())
Expand DownExpand Up@@ -647,6 +653,14 @@ mod tests {
assert_eq!(compressed_point.as_bytes(), &COMPRESSED_BYTES[..]);
}

#[test]
fn identity() {
let identity_point = EncodedPoint::identity();
assert_eq!(identity_point.tag(), Tag::Identity);
assert_eq!(identity_point.len(), 1);
assert_eq!(identity_point.as_bytes(), &IDENTITY_BYTES[..]);
}

#[cfg(feature = "alloc")]
#[test]
fn to_bytes() {
Expand Down