diff options
| -rw-r--r-- | crypto/clmul.c | 21 | ||||
| -rw-r--r-- | include/crypto/clmul.h | 16 |
2 files changed, 37 insertions, 0 deletions
diff --git a/crypto/clmul.c b/crypto/clmul.c index 82d873fee5..2c87cfbf8a 100644 --- a/crypto/clmul.c +++ b/crypto/clmul.c @@ -58,3 +58,24 @@ uint64_t clmul_8x4_packed(uint32_t n, uint32_t m) { return clmul_8x4_even_int(unpack_8_to_16(n), unpack_8_to_16(m)); } + +uint64_t clmul_16x2_even(uint64_t n, uint64_t m) +{ + uint64_t r = 0; + + n &= 0x0000ffff0000ffffull; + m &= 0x0000ffff0000ffffull; + + for (int i = 0; i < 16; ++i) { + uint64_t mask = (n & 0x0000000100000001ull) * 0xffffffffull; + r ^= m & mask; + n >>= 1; + m <<= 1; + } + return r; +} + +uint64_t clmul_16x2_odd(uint64_t n, uint64_t m) +{ + return clmul_16x2_even(n >> 16, m >> 16); +} diff --git a/include/crypto/clmul.h b/include/crypto/clmul.h index 153b5e3057..72672b237c 100644 --- a/include/crypto/clmul.h +++ b/include/crypto/clmul.h @@ -38,4 +38,20 @@ uint64_t clmul_8x4_odd(uint64_t, uint64_t); */ uint64_t clmul_8x4_packed(uint32_t, uint32_t); +/** + * clmul_16x2_even: + * + * Perform two 16x16->32 carry-less multiplies. + * The odd words of the inputs are ignored. + */ +uint64_t clmul_16x2_even(uint64_t, uint64_t); + +/** + * clmul_16x2_odd: + * + * Perform two 16x16->32 carry-less multiplies. + * The even words of the inputs are ignored. + */ +uint64_t clmul_16x2_odd(uint64_t, uint64_t); + #endif /* CRYPTO_CLMUL_H */ |