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Align Intel version of pfx_shift_left with the ARM/soft impls

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Frank Denis
2025-12-30 09:47:48 +01:00
parent 4f498b72d4
commit 53f73b51e4
1 changed files with 7 additions and 5 deletions
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src/libsodium/crypto_ipcrypt/ipcrypt_aesni.c
+7 -5
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@@ -316,11 +316,13 @@ pfx_set_bit(uint8_t ip16[16], const unsigned int bit_index, const uint8_t bit_va
static void
pfx_shift_left(uint8_t ip16[16])
{
BlockVec v = LOAD128(ip16);
BlockVec shl = _mm_slli_epi64(v, 1);
BlockVec shr = _mm_srli_epi64(v, 63);
BlockVec car = _mm_slli_si128(shr, 8);
v = _mm_or_si128(shl, car);
BlockVec v = LOAD128(ip16);
const BlockVec mask_fe = _mm_set1_epi8((char) 0xfe);
const BlockVec mask_01 = _mm_set1_epi8(0x01);
const BlockVec shl = _mm_and_si128(_mm_slli_epi16(v, 1), mask_fe);
const BlockVec msb = _mm_and_si128(_mm_srli_epi16(v, 7), mask_01);
const BlockVec carries = _mm_srli_si128(msb, 1);
v = _mm_or_si128(shl, carries);
STORE128(ip16, v);
}