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use crate::{Digest, FixedOutput, FixedOutputReset, HashMarker, Update};
use core::fmt::Debug;
/// Fixed-output resettable digest test via the `Digest` trait
pub fn fixed_reset_test<D>(input: &[u8], output: &[u8]) -> Option<&'static str>
where
D: FixedOutputReset + Debug + Clone + Default + Update + HashMarker,
{
let mut hasher = D::new();
// Test that it works when accepting the message all at once
hasher.update(input);
let mut hasher2 = hasher.clone();
if hasher.finalize()[..] != output[..] {
return Some("whole message");
}
// Test if reset works correctly
hasher2.reset();
hasher2.update(input);
if hasher2.finalize_reset()[..] != output[..] {
return Some("whole message after reset");
}
// Test that it works when accepting the message in chunks
for n in 1..core::cmp::min(17, input.len()) {
let mut hasher = D::new();
for chunk in input.chunks(n) {
hasher.update(chunk);
hasher2.update(chunk);
}
if hasher.finalize()[..] != output[..] {
return Some("message in chunks");
}
if hasher2.finalize_reset()[..] != output[..] {
return Some("message in chunks");
}
}
None
}
/// Variable-output resettable digest test
pub fn fixed_test<D>(input: &[u8], output: &[u8]) -> Option<&'static str>
where
D: FixedOutput + Default + Debug + Clone,
{
let mut hasher = D::default();
// Test that it works when accepting the message all at once
hasher.update(input);
if hasher.finalize_fixed()[..] != output[..] {
return Some("whole message");
}
// Test that it works when accepting the message in chunks
for n in 1..core::cmp::min(17, input.len()) {
let mut hasher = D::default();
for chunk in input.chunks(n) {
hasher.update(chunk);
}
if hasher.finalize_fixed()[..] != output[..] {
return Some("message in chunks");
}
}
None
}