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