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refactor Sha256 methods

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This commit is contained in:
Ishan Jain 2022-03-30 13:22:14 +05:30
parent f23e0bc759
commit c36e7d669f
1 changed files with 15 additions and 25 deletions
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40
src/main.rs
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@ -22,7 +22,7 @@ fn main() -> Result<(), std::io::Error> {
let mut s256 = Sha256::new();
loop {
let read = s256.sum(&mut stdin)?;
let read = s256.update(&mut stdin)?;
if read != 64 {
break;
}
@ -30,7 +30,7 @@ fn main() -> Result<(), std::io::Error> {
}
// Compute hash
for c in s256.state() {
for c in s256.sum() {
for b in c.to_be_bytes() {
print!("{:02x?}", b);
}
@ -40,10 +40,10 @@ fn main() -> Result<(), std::io::Error> {
Ok(())
}
struct Sha256 {
state: [u32; 8],
message_length: usize,
buffer: [u8; 128],
block_read: usize,
}
@ -58,31 +58,25 @@ impl Sha256 {
}
}
const fn state(&self) -> [u32; 8] {
self.state
}
fn sum_existing_buffer(&mut self) {
if self.block_read != 64 {
self.pad();
}
self.compress();
}
fn sum<R: Read>(&mut self, r: &mut R) -> Result<usize, std::io::Error> {
fn update<R: Read>(&mut self, r: &mut R) -> Result<usize, std::io::Error> {
let read = r.read(&mut self.buffer[..64])?;
self.block_read = read;
self.message_length += read;
if read != 64 {
self.compress();
Ok(read)
}
fn sum(&mut self) -> [u32; 8] {
if self.block_read != 64 {
self.pad();
}
self.compress();
Ok(read)
self.state
}
fn pad(&mut self) {
@ -109,7 +103,7 @@ impl Sha256 {
let mut state = self.state;
for i in 0..64 {
state = round(state, ROUND_CONSTANT[i], msg[i])
state = round(state, ROUND_CONSTANT[i], msg[i]);
}
self.state[0] = self.state[0].wrapping_add(state[0]);
@ -259,9 +253,7 @@ fn sha256_test() {
2018687061,
];
s256.sum_existing_buffer();
assert_eq!(expected_compression, s256.state());
assert_eq!(expected_compression, s256.sum());
}
#[test]
@ -311,7 +303,5 @@ fn sha256_test2() {
3050570844, 1061580713, 534957162, 3195609898, 441961969, 83337838, 1903036958, 663347064,
];
s256.sum_existing_buffer();
assert_eq!(expected_compression, s256.state());
assert_eq!(expected_compression, s256.sum());
}