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Use aesni_gcm_mult() if available

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-12-26 16:09:58 +01:00
parent d333f67f8c
commit 80637c7520
1 changed files with 29 additions and 4 deletions
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33
library/gcm.c
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@ -39,6 +39,10 @@
#include "polarssl/gcm.h"
#if defined(POLARSSL_AESNI_C)
#include "polarssl/aesni.h"
#endif
/*
* 32-bit integer manipulation macros (big endian)
*/
@ -82,10 +86,7 @@ static int gcm_gen_table( gcm_context *ctx )
if( ( ret = cipher_update( &ctx->cipher_ctx, h, 16, h, &olen ) ) != 0 )
return( ret );
/* 0 corresponds to 0 in GF(2^128) */
ctx->HH[0] = 0;
ctx->HL[0] = 0;
/* pack h as two 64-bits ints, big-endian */
GET_UINT32_BE( hi, h, 0 );
GET_UINT32_BE( lo, h, 4 );
vh = (uint64_t) hi << 32 | lo;
@ -98,6 +99,16 @@ static int gcm_gen_table( gcm_context *ctx )
ctx->HL[8] = vl;
ctx->HH[8] = vh;
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
/* With CLMUL support, we need only h, not the rest of the table */
if( aesni_supports( POLARSSL_AESNI_CLMUL ) )
return( 0 );
#endif
/* 0 corresponds to 0 in GF(2^128) */
ctx->HH[0] = 0;
ctx->HL[0] = 0;
for( i = 4; i > 0; i >>= 1 )
{
uint32_t T = ( vl & 1 ) * 0xe1000000U;
@ -178,6 +189,20 @@ static void gcm_mult( gcm_context *ctx, const unsigned char x[16],
unsigned char lo, hi, rem;
uint64_t zh, zl;
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
if( aesni_supports( POLARSSL_AESNI_CLMUL ) ) {
unsigned char h[16];
PUT_UINT32_BE( ctx->HH[8] >> 32, h, 0 );
PUT_UINT32_BE( ctx->HH[8], h, 4 );
PUT_UINT32_BE( ctx->HL[8] >> 32, h, 8 );
PUT_UINT32_BE( ctx->HL[8], h, 12 );
(void) aesni_gcm_mult( output, x, h );
return;
}
#endif
memset( z, 0x00, 16 );
lo = x[15] & 0xf;