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sha512: Move from_engine functions 

Make a step towards making the `sha512` module have its code layed out
the same as the rest of the hash modules.

Code move only, no other changes.
This commit is contained in:
Tobin C. Harding 2023-11-03 10:14:05 +11:00
parent 071208ccdd
commit d51c1857fd
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GPG Key ID: 40BF9E4C269D6607
1 changed files with 28 additions and 28 deletions
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56
hashes/src/sha512.rs
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@ -12,6 +12,34 @@ use crate::{FromSliceError, HashEngine as _};
crate::internal_macros::hash_trait_impls!(512, false);
#[cfg(not(hashes_fuzz))]
pub(crate) fn from_engine(mut e: HashEngine) -> Hash {
// pad buffer with a single 1-bit then all 0s, until there are exactly 16 bytes remaining
let data_len = e.length as u64;
let zeroes = [0; BLOCK_SIZE - 16];
e.input(&[0x80]);
if e.length % BLOCK_SIZE > zeroes.len() {
e.input(&zeroes);
}
let pad_length = zeroes.len() - (e.length % BLOCK_SIZE);
e.input(&zeroes[..pad_length]);
debug_assert_eq!(e.length % BLOCK_SIZE, zeroes.len());
e.input(&[0; 8]);
e.input(&(8 * data_len).to_be_bytes());
debug_assert_eq!(e.length % BLOCK_SIZE, 0);
Hash(e.midstate())
}
#[cfg(hashes_fuzz)]
pub(crate) fn from_engine(e: HashEngine) -> Hash {
let mut hash = e.midstate();
hash[0] ^= 0xff; // Make this distinct from SHA-256
Hash(hash)
}
pub(crate) const BLOCK_SIZE: usize = 128;
/// Engine to compute SHA512 hash function.
@ -95,34 +123,6 @@ impl Hash {
fn internal_engine() -> HashEngine { Default::default() }
}
#[cfg(not(hashes_fuzz))]
pub(crate) fn from_engine(mut e: HashEngine) -> Hash {
// pad buffer with a single 1-bit then all 0s, until there are exactly 16 bytes remaining
let data_len = e.length as u64;
let zeroes = [0; BLOCK_SIZE - 16];
e.input(&[0x80]);
if e.length % BLOCK_SIZE > zeroes.len() {
e.input(&zeroes);
}
let pad_length = zeroes.len() - (e.length % BLOCK_SIZE);
e.input(&zeroes[..pad_length]);
debug_assert_eq!(e.length % BLOCK_SIZE, zeroes.len());
e.input(&[0; 8]);
e.input(&(8 * data_len).to_be_bytes());
debug_assert_eq!(e.length % BLOCK_SIZE, 0);
Hash(e.midstate())
}
#[cfg(hashes_fuzz)]
pub(crate) fn from_engine(e: HashEngine) -> Hash {
let mut hash = e.midstate();
hash[0] ^= 0xff; // Make this distinct from SHA-256
Hash(hash)
}
#[allow(non_snake_case)]
fn Ch(x: u64, y: u64, z: u64) -> u64 { z ^ (x & (y ^ z)) }
#[allow(non_snake_case)]