diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 18:34:58 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 18:34:58 +0000 |
commit | 1d5bb90cb0a1b457570019845fed207faed67a99 (patch) | |
tree | d95f8ea0fb9c9c4eb9ae55c70faa2bc02a7bcea4 /third_party/rust/ahash/src/hash_quality_test.rs | |
parent | Adding upstream version 115.9.1esr. (diff) | |
download | firefox-esr-upstream/115.10.0esr.tar.xz firefox-esr-upstream/115.10.0esr.zip |
Adding upstream version 115.10.0esr.upstream/115.10.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/ahash/src/hash_quality_test.rs')
-rw-r--r-- | third_party/rust/ahash/src/hash_quality_test.rs | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/third_party/rust/ahash/src/hash_quality_test.rs b/third_party/rust/ahash/src/hash_quality_test.rs index 4cd3156afe..17228d4716 100644 --- a/third_party/rust/ahash/src/hash_quality_test.rs +++ b/third_party/rust/ahash/src/hash_quality_test.rs @@ -1,5 +1,5 @@ use core::hash::{Hash, Hasher}; -use std::collections::HashMap; +use std::collections::{HashMap}; fn assert_sufficiently_different(a: u64, b: u64, tolerance: i32) { let (same_byte_count, same_nibble_count) = count_same_bytes_and_nibbles(a, b); @@ -326,6 +326,28 @@ fn test_length_extension<T: Hasher>(hasher: impl Fn(u128, u128) -> T) { } } +fn test_sparse<T: Hasher>(hasher: impl Fn() -> T) { + let mut buf = [0u8; 256]; + let mut hashes = HashMap::new(); + for idx_1 in 0..256 { + for idx_2 in idx_1+1..256 { + for value_1 in [1, 2, 4, 8, 16, 32, 64, 128] { + for value_2 in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 17, 18, 20, 24, 31, 32, 33, 48, 64, 96, 127, 128, 129, 192, 254, 255] { + buf[idx_1] = value_1; + buf[idx_2] = value_2; + let hash_value = hash_with(&buf, &mut hasher()); + let keys = hashes.entry(hash_value).or_insert(Vec::new()); + keys.push((idx_1, value_1, idx_2, value_2)); + buf[idx_1] = 0; + buf[idx_2] = 0; + } + } + } + } + hashes.retain(|_key, value| value.len() != 1); + assert_eq!(0, hashes.len(), "Collision with: {:?}", hashes); +} + #[cfg(test)] mod fallback_tests { use crate::fallback_hash::*; @@ -392,6 +414,12 @@ mod fallback_tests { fn fallback_length_extension() { test_length_extension(|a, b| AHasher::new_with_keys(a, b)); } + + #[test] + fn test_no_sparse_collisions() { + test_sparse(|| AHasher::new_with_keys(0, 0)); + test_sparse(|| AHasher::new_with_keys(1, 2)); + } } ///Basic sanity tests of the cypto properties of aHash. @@ -480,4 +508,10 @@ mod aes_tests { fn aes_length_extension() { test_length_extension(|a, b| AHasher::test_with_keys(a, b)); } + + #[test] + fn aes_no_sparse_collisions() { + test_sparse(|| AHasher::test_with_keys(0, 0)); + test_sparse(|| AHasher::test_with_keys(1, 2)); + } } |