mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-09-21 20:40:13 +02:00
237 lines
6.6 KiB
C
237 lines
6.6 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Copyright(c) 2013, Intel Corp. */
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/* Wrapper funcions for Intel optimized implementation of AES-GCM */
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#ifdef USE_HW_AES
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#ifdef FREEBL_NO_DEPEND
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#include "stubs.h"
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#endif
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#include "blapii.h"
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#include "blapit.h"
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#include "gcm.h"
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#include "ctr.h"
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#include "secerr.h"
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#include "prtypes.h"
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#include "pkcs11t.h"
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#include <limits.h>
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#include "intel-gcm.h"
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#include "rijndael.h"
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#if defined(__INTEL_COMPILER)
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#include <ia32intrin.h>
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#elif defined(__GNUC__)
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#include <emmintrin.h>
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#include <tmmintrin.h>
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#endif
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struct intel_AES_GCMContextStr{
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unsigned char Htbl[16*AES_BLOCK_SIZE];
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unsigned char X0[AES_BLOCK_SIZE];
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unsigned char T[AES_BLOCK_SIZE];
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unsigned char CTR[AES_BLOCK_SIZE];
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AESContext *aes_context;
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unsigned long tagBits;
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unsigned long Alen;
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unsigned long Mlen;
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};
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intel_AES_GCMContext *intel_AES_GCM_CreateContext(void *context,
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freeblCipherFunc cipher,
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const unsigned char *params,
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unsigned int blocksize)
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{
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intel_AES_GCMContext *gcm = NULL;
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AESContext *aes = (AESContext*)context;
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const CK_GCM_PARAMS *gcmParams = (const CK_GCM_PARAMS *)params;
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unsigned char buff[AES_BLOCK_SIZE]; /* aux buffer */
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int IV_whole_len = gcmParams->ulIvLen&(~0xf);
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int IV_remainder_len = gcmParams->ulIvLen&0xf;
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int AAD_whole_len = gcmParams->ulAADLen&(~0xf);
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int AAD_remainder_len = gcmParams->ulAADLen&0xf;
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__m128i BSWAP_MASK = _mm_setr_epi8(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0);
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__m128i ONE = _mm_set_epi32(0,0,0,1);
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unsigned int j;
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SECStatus rv;
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if (blocksize != AES_BLOCK_SIZE) {
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PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
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return NULL;
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}
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gcm = PORT_ZNew(intel_AES_GCMContext);
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if (gcm == NULL) {
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return NULL;
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}
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/* initialize context fields */
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gcm->aes_context = aes;
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gcm->tagBits = gcmParams->ulTagBits;
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gcm->Alen = 0;
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gcm->Mlen = 0;
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/* first prepare H and its derivatives for ghash */
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intel_aes_gcmINIT(gcm->Htbl, (unsigned char*)aes->expandedKey, aes->Nr);
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/* Initial TAG value is zero*/
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_mm_storeu_si128((__m128i*)gcm->T, _mm_setzero_si128());
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_mm_storeu_si128((__m128i*)gcm->X0, _mm_setzero_si128());
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/* Init the counter */
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if(gcmParams->ulIvLen == 12) {
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_mm_storeu_si128((__m128i*)gcm->CTR, _mm_setr_epi32(((unsigned int*)gcmParams->pIv)[0], ((unsigned int*)gcmParams->pIv)[1], ((unsigned int*)gcmParams->pIv)[2], 0x01000000));
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} else {
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/* If IV size is not 96 bits, then the initial counter value is GHASH of the IV */
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intel_aes_gcmAAD(gcm->Htbl, gcmParams->pIv, IV_whole_len, gcm->T);
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/* Partial block */
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if(IV_remainder_len) {
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PORT_Memset(buff, 0, AES_BLOCK_SIZE);
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PORT_Memcpy(buff, gcmParams->pIv + IV_whole_len, IV_remainder_len);
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intel_aes_gcmAAD(gcm->Htbl, buff, AES_BLOCK_SIZE, gcm->T);
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}
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intel_aes_gcmTAG
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(
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gcm->Htbl,
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gcm->T,
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gcmParams->ulIvLen,
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0,
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gcm->X0,
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gcm->CTR
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);
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/* TAG should be zero again */
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_mm_storeu_si128((__m128i*)gcm->T, _mm_setzero_si128());
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}
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/* Encrypt the initial counter, will be used to encrypt the GHASH value, in the end */
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rv = (*cipher)(context, gcm->X0, &j, AES_BLOCK_SIZE, gcm->CTR, AES_BLOCK_SIZE, AES_BLOCK_SIZE);
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if (rv != SECSuccess) {
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goto loser;
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}
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/* Promote the counter by 1 */
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_mm_storeu_si128((__m128i*)gcm->CTR, _mm_shuffle_epi8(_mm_add_epi32(ONE, _mm_shuffle_epi8(_mm_loadu_si128((__m128i*)gcm->CTR), BSWAP_MASK)), BSWAP_MASK));
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/* Now hash AAD - it would actually make sense to seperate the context creation from the AAD,
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* because that would allow to reuse the H, which only changes when the AES key changes,
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* and not every package, like the IV and AAD */
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intel_aes_gcmAAD(gcm->Htbl, gcmParams->pAAD, AAD_whole_len, gcm->T);
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if(AAD_remainder_len) {
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PORT_Memset(buff, 0, AES_BLOCK_SIZE);
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PORT_Memcpy(buff, gcmParams->pAAD + AAD_whole_len, AAD_remainder_len);
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intel_aes_gcmAAD(gcm->Htbl, buff, AES_BLOCK_SIZE, gcm->T);
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}
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gcm->Alen += gcmParams->ulAADLen;
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return gcm;
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loser:
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if (gcm) {
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PORT_Free(gcm);
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}
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return NULL;
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}
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void intel_AES_GCM_DestroyContext(intel_AES_GCMContext *gcm, PRBool freeit)
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{
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if (freeit) {
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PORT_Free(gcm);
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}
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}
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SECStatus intel_AES_GCM_EncryptUpdate(intel_AES_GCMContext *gcm,
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unsigned char *outbuf,
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unsigned int *outlen, unsigned int maxout,
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const unsigned char *inbuf, unsigned int inlen,
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unsigned int blocksize)
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{
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unsigned int tagBytes;
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unsigned char T[AES_BLOCK_SIZE];
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int j;
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tagBytes = (gcm->tagBits + (PR_BITS_PER_BYTE-1)) / PR_BITS_PER_BYTE;
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if (UINT_MAX - inlen < tagBytes) {
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PORT_SetError(SEC_ERROR_INPUT_LEN);
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return SECFailure;
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}
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if (maxout < inlen + tagBytes) {
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*outlen = inlen + tagBytes;
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PORT_SetError(SEC_ERROR_OUTPUT_LEN);
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return SECFailure;
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}
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intel_aes_gcmENC(
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inbuf,
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outbuf,
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gcm,
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inlen);
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gcm->Mlen += inlen;
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intel_aes_gcmTAG(
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gcm->Htbl,
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gcm->T,
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gcm->Mlen,
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gcm->Alen,
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gcm->X0,
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T);
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*outlen = inlen + tagBytes;
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for(j=0; j<tagBytes; j++)
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{
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outbuf[inlen+j] = T[j];
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}
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return SECSuccess;
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}
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SECStatus intel_AES_GCM_DecryptUpdate(intel_AES_GCMContext *gcm,
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unsigned char *outbuf,
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unsigned int *outlen, unsigned int maxout,
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const unsigned char *inbuf, unsigned int inlen,
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unsigned int blocksize)
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{
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unsigned int tagBytes;
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unsigned char T[AES_BLOCK_SIZE];
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const unsigned char *intag;
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tagBytes = (gcm->tagBits + (PR_BITS_PER_BYTE-1)) / PR_BITS_PER_BYTE;
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/* get the authentication block */
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if (inlen < tagBytes) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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inlen -= tagBytes;
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intag = inbuf + inlen;
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intel_aes_gcmDEC(
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inbuf,
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outbuf,
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gcm,
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inlen);
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gcm->Mlen += inlen;
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intel_aes_gcmTAG(
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gcm->Htbl,
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gcm->T,
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gcm->Mlen,
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gcm->Alen,
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gcm->X0,
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T);
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if (NSS_SecureMemcmp(T, intag, tagBytes) != 0) {
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/* force a CKR_ENCRYPTED_DATA_INVALID error at in softoken */
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PORT_SetError(SEC_ERROR_BAD_DATA);
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return SECFailure;
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}
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*outlen = inlen;
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return SECSuccess;
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}
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#endif
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