43 lines
1 KiB
Rust
43 lines
1 KiB
Rust
use blake2::{Blake2b512, Digest};
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use crate::crypto::CryptoError;
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use crate::enc;
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/// A Blake2b512 digest
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub struct Blake2Sum([u8; 64]);
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impl Blake2Sum {
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/// Create a Blake2Sum object by passing the digest as bytes directly
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pub fn from_bytes(bytes: [u8; 64]) -> Self {
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Self(bytes)
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}
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/// Compute the Blake2b512 digest of a byte slice
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pub fn compute(buf: &[u8]) -> Self {
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let mut hasher = Blake2b512::new();
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hasher.update(buf);
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Self(hasher.finalize()[..].try_into().unwrap())
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}
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/// Check that this digest corresponds to a given slice
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pub fn verify(&self, buf: &[u8]) -> Result<(), CryptoError> {
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if Self::compute(buf) == *self {
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Ok(())
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} else {
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Err(CryptoError::InvalidHash)
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}
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}
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/// Return a reference to the inner byte slice
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pub fn as_bytes(&self) -> &[u8] {
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&self.0[..]
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}
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}
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impl enc::Encode for Blake2Sum {
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fn term(&self) -> enc::Term<'_> {
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enc::bytes(self.as_bytes())
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}
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}
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