Mercurial > dropbear
view libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 1772:0cc85b4a4abb
Move fuzzer-kex initialisation into a constructor function
Hopefully this can avoid hitting AFL timeouts
https://github.com/google/oss-fuzz/pull/2474
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 29 Oct 2020 23:00:52 +0800 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ /** @file gcm_mult_h.c GCM implementation, do the GF mult, by Tom St Denis */ #include "tomcrypt.h" #if defined(LTC_GCM_MODE) /** GCM multiply by H @param gcm The GCM state which holds the H value @param I The value to multiply H by */ void gcm_mult_h(gcm_state *gcm, unsigned char *I) { unsigned char T[16]; #ifdef LTC_GCM_TABLES int x; #ifdef LTC_GCM_TABLES_SSE2 asm("movdqa (%0),%%xmm0"::"r"(&gcm->PC[0][I[0]][0])); for (x = 1; x < 16; x++) { asm("pxor (%0),%%xmm0"::"r"(&gcm->PC[x][I[x]][0])); } asm("movdqa %%xmm0,(%0)"::"r"(&T)); #else int y; XMEMCPY(T, &gcm->PC[0][I[0]][0], 16); for (x = 1; x < 16; x++) { #ifdef LTC_FAST for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&gcm->PC[x][I[x]][y])); } #else for (y = 0; y < 16; y++) { T[y] ^= gcm->PC[x][I[x]][y]; } #endif /* LTC_FAST */ } #endif /* LTC_GCM_TABLES_SSE2 */ #else gcm_gf_mult(gcm->H, I, T); #endif XMEMCPY(I, T, 16); } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */