diff options
Diffstat (limited to 'src/Crypto/Sha2Intel.c')
| -rw-r--r-- | src/Crypto/Sha2Intel.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/Crypto/Sha2Intel.c b/src/Crypto/Sha2Intel.c index c926f76a..943115bf 100644 --- a/src/Crypto/Sha2Intel.c +++ b/src/Crypto/Sha2Intel.c @@ -21,6 +21,66 @@ #if CRYPTOPP_SHANI_AVAILABLE +#ifndef _MSC_VER +#include <signal.h> +#include <setjmp.h> + +typedef void (*SigHandler)(int); + +static jmp_buf s_jmpNoSHA; +static void SigIllHandlerSHA(int p) +{ + longjmp(s_jmpNoSHA, 1); +} +#endif + +int TrySHA256() +{ + volatile int result = 0; +#ifdef _MSC_VER + __try +#else + SigHandler oldHandler = signal(SIGILL, SigIllHandlerSHA); + if (oldHandler == SIG_ERR) + return 0; + if (setjmp(s_jmpNoSHA)) + result = 0; + else +#endif + { + // Known input message block + __m128i msg0 = _mm_setr_epi32(0x12345678, 0x9ABCDEF0, 0x87654321, 0x0FEDCBA9); + __m128i msg1 = _mm_setr_epi32(0x11111111, 0x22222222, 0x33333333, 0x44444444); + + // SHA256 message schedule update + __m128i tmp = _mm_sha256msg1_epu32(msg0, msg1); + + // Verify result - these values were pre-computed for the given input +#ifdef _MSC_VER + if (tmp.m128i_u32[0] == 0xD8131B44 && + tmp.m128i_u32[1] == 0x9DE6E22B && + tmp.m128i_u32[2] == 0xA86D643A && + tmp.m128i_u32[3] == 0x74320FED) +#else + if (((uint32_t*)(&tmp))[0] == 0xD8131B44 && + ((uint32_t*)(&tmp))[1] == 0x9DE6E22B && + ((uint32_t*)(&tmp))[2] == 0xA86D643A && + ((uint32_t*)(&tmp))[3] == 0x74320FED) +#endif + result = 1; + } +#ifdef _MSC_VER + __except (EXCEPTION_EXECUTE_HANDLER) + { + // ignore error if SHA instructions not supported + } +#else + signal(SIGILL, oldHandler); +#endif + + return result; +} + // void sha256_intel(void *mp, uint_32t state[8], uint_64t num_blks) { |