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| author | David Gibson <david@gibson.dropbear.id.au> | 2023-09-28 11:20:53 +1000 |
|---|---|---|
| committer | Stefano Brivio <sbrivio@redhat.com> | 2023-09-30 12:40:30 +0200 |
| commit | ca6e94702cfbe29b279cf18f39a0fe492fae6f83 (patch) | |
| tree | 2422a255629f810d9cdbe1617860d444feceaea6 /siphash.c | |
| parent | c1d2a070f282a95316e8f045e8959856518ab2f0 (diff) | |
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siphash: Make siphash functions consistently return 64-bit results
Some of the siphas_*b() functions return 64-bit results, others 32-bit
results, with no obvious pattern. siphash_32b() also appears to do this
incorrectly - taking the 64-bit hash value and simply returning it
truncated, rather than folding the two halves together.
Since SipHash proper is defined to give a 64-bit hash, make all of them
return 64-bit results. In the one caller which needs a 32-bit value,
tcp_seq_init() do the fold down to 32-bits ourselves.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'siphash.c')
| -rw-r--r-- | siphash.c | 17 |
1 files changed, 7 insertions, 10 deletions
@@ -61,7 +61,6 @@ uint64_t v[4] = { 0x736f6d6570736575ULL, 0x646f72616e646f6dULL, \ 0x6c7967656e657261ULL, 0x7465646279746573ULL }; \ uint64_t b = (uint64_t)(len) << 56; \ - uint32_t ret; \ int __i; \ \ do { \ @@ -93,8 +92,6 @@ v[2] ^= 0xff; \ SIPROUND(4); \ b = (v[0] ^ v[1]) ^ (v[2] ^ v[3]); \ - ret = (uint32_t)(b >> 32) ^ (uint32_t)b; \ - (void)ret; \ } while (0) /** @@ -132,12 +129,12 @@ uint64_t siphash_8b(const uint8_t *in, const uint64_t *k) * @in: Input data (two addresses, two ports) * @k: Hash function key, 128 bits * - * Return: 32 bits obtained by XORing the two halves of the 64-bit hash output + * Return: the 64-bit hash output */ /* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */ __attribute__((optimize("-fno-strict-aliasing"))) /* See siphash_8b() */ /* cppcheck-suppress unusedFunction */ -uint32_t siphash_12b(const uint8_t *in, const uint64_t *k) +uint64_t siphash_12b(const uint8_t *in, const uint64_t *k) { uint32_t *in32 = (uint32_t *)in; uint64_t combined; @@ -151,7 +148,7 @@ uint32_t siphash_12b(const uint8_t *in, const uint64_t *k) b |= *(in32 + 2); POSTAMBLE; - return ret; + return b; } /** @@ -194,7 +191,7 @@ uint64_t siphash_20b(const uint8_t *in, const uint64_t *k) /* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */ __attribute__((optimize("-fno-strict-aliasing"))) /* See siphash_8b() */ /* cppcheck-suppress unusedFunction */ -uint32_t siphash_32b(const uint8_t *in, const uint64_t *k) +uint64_t siphash_32b(const uint8_t *in, const uint64_t *k) { uint64_t *in64 = (uint64_t *)in; int i; @@ -217,11 +214,11 @@ uint32_t siphash_32b(const uint8_t *in, const uint64_t *k) * @in: Input data (two addresses, two ports) * @k: Hash function key, 128 bits * - * Return: 32 bits obtained by XORing the two halves of the 64-bit hash output + * Return: the 64-bit hash output */ /* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */ __attribute__((optimize("-fno-strict-aliasing"))) /* See siphash_8b() */ -uint32_t siphash_36b(const uint8_t *in, const uint64_t *k) +uint64_t siphash_36b(const uint8_t *in, const uint64_t *k) { uint32_t *in32 = (uint32_t *)in; int i; @@ -239,5 +236,5 @@ uint32_t siphash_36b(const uint8_t *in, const uint64_t *k) b |= *in32; POSTAMBLE; - return ret; + return b; } |