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Refactor Scalar::hash_from_bytes to allow streaming input to the hash.

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Henry de Valence 2017-02-28 19:08:37 -08:00
parent a89177f80e
commit eca28fd3e8
1 changed files with 12 additions and 0 deletions
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12
src/scalar.rs
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@ -173,6 +173,8 @@ impl Scalar {
/// Takes a type parameter `D`, which is any `Digest` producing 64
/// bytes (512 bits) of output.
///
/// Convenience wrapper around `from_hash`.
///
/// # Example
///
/// ```
@ -193,6 +195,16 @@ impl Scalar {
where D: Digest<OutputSize=U64> + Default {
let mut hash = D::default();
hash.input(input);
Scalar::from_hash(hash)
}
/// Construct a scalar from an existing `Digest` instance.
///
/// Use this instead of `hash_from_bytes` if it is more convenient
/// to stream data into the `Digest` than to pass a single byte
/// slice.
pub fn from_hash<D>(hash: D) -> Scalar
where D: Digest<OutputSize=U64> + Default {
// XXX this seems clumsy
let mut output = [0u8;64];
output.copy_from_slice(hash.result().as_slice());