From 9a65a570fab1bf2e907d593631a6b588a821d365 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Tue, 11 Jul 2023 09:54:06 +0100 Subject: crypto: Add generic 32-bit carry-less multiply routines Reviewed-by: Ard Biesheuvel Signed-off-by: Richard Henderson --- crypto/clmul.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'crypto/clmul.c') diff --git a/crypto/clmul.c b/crypto/clmul.c index 2c87cfbf8a..36ada1be9d 100644 --- a/crypto/clmul.c +++ b/crypto/clmul.c @@ -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; +} -- cgit v1.2.3