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crypto: Add generic 32-bit carry-less multiply routines

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Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-11 09:54:06 +01:00
parent a2c67342ee
commit 9a65a570fa
2 changed files with 20 additions and 0 deletions
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13
crypto/clmul.c
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@ -79,3 +79,16 @@ uint64_t clmul_16x2_odd(uint64_t n, uint64_t m)
{
return clmul_16x2_even(n >> 16, m >> 16);
}
uint64_t clmul_32(uint32_t n, uint32_t m32)
{
uint64_t r = 0;
uint64_t m = m32;
for (int i = 0; i < 32; ++i) {
r ^= n & 1 ? m : 0;
n >>= 1;
m <<= 1;
}
return r;
}

7
include/crypto/clmul.h
View file

@ -54,4 +54,11 @@ uint64_t clmul_16x2_even(uint64_t, uint64_t);
*/
uint64_t clmul_16x2_odd(uint64_t, uint64_t);
/**
* clmul_32:
*
* Perform a 32x32->64 carry-less multiply.
*/
uint64_t clmul_32(uint32_t, uint32_t);
#endif /* CRYPTO_CLMUL_H */