crypto/evp/e_aes_cbc_hmac_sha1.c

   1 /* ====================================================================
   2  * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  */
  49
  50 #include <openssl/opensslconf.h>
  51
  52 #include <stdio.h>
  53 #include <string.h>
  54
  55 #if !defined(OPENSSL_NO_AES) && !defined(OPENSSL_NO_SHA1)
  56
  57 #include <openssl/evp.h>
  58 #include <openssl/objects.h>
  59 #include <openssl/aes.h>
  60 #include <openssl/sha.h>
  61
  62 #ifndef EVP_CIPH_FLAG_AEAD_CIPHER
  63 #define EVP_CIPH_FLAG_AEAD_CIPHER       0x200000
  64 #define EVP_CTRL_AEAD_TLS1_AAD          0x16
  65 #define EVP_CTRL_AEAD_SET_MAC_KEY       0x17
  66 #endif
  67
  68 #if !defined(EVP_CIPH_FLAG_DEFAULT_ASN1)
  69 #define EVP_CIPH_FLAG_DEFAULT_ASN1 0
  70 #endif
  71
  72 #define TLS1_1_VERSION 0x0302
  73
  74 typedef struct
  75     {
  76     AES_KEY             ks;
  77     SHA_CTX             head,tail,md;
  78     size_t              payload_length; /* AAD length in decrypt case */
  79     union {
  80         unsigned int    tls_ver;
  81         unsigned char   tls_aad[16];    /* 13 used */
  82     } aux;
  83     } EVP_AES_HMAC_SHA1;
  84
  85 #if     defined(AES_ASM) &&     ( \
  86         defined(__x86_64)       || defined(__x86_64__)  || \
  87         defined(_M_AMD64)       || defined(_M_X64)      || \
  88         defined(__INTEL__)      )
  89
  90 extern unsigned int OPENSSL_ia32cap_P[2];
  91 #define AESNI_CAPABLE   (1<<(57-32))
  92
  93 int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
  94                               AES_KEY *key);
  95 int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
  96                               AES_KEY *key);
  97
  98 void aesni_cbc_encrypt(const unsigned char *in,
  99                            unsigned char *out,
 100                            size_t length,
 101                            const AES_KEY *key,
 102                            unsigned char *ivec, int enc);
 103
 104 void aesni_cbc_sha1_enc (const void *inp, void *out, size_t blocks,
 105                 const AES_KEY *key, unsigned char iv[16],
 106                 SHA_CTX *ctx,const void *in0);
 107
 108 #define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
 109
 110 static int aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
 111                         const unsigned char *inkey,
 112                         const unsigned char *iv, int enc)
 113         {
 114         EVP_AES_HMAC_SHA1 *key = data(ctx);
 115         int ret;
 116
 117         if (enc)
 118                 ret=aesni_set_encrypt_key(inkey,ctx->key_len*8,&key->ks);
 119         else
 120                 ret=aesni_set_decrypt_key(inkey,ctx->key_len*8,&key->ks);
 121
 122         SHA1_Init(&key->head);  /* handy when benchmarking */
 123         key->tail = key->head;
 124         key->md   = key->head;
 125
 126         key->payload_length = 0;
 127
 128         return ret<0?0:1;
 129         }
 130
 131 #define STITCHED_CALL
 132
 133 #if !defined(STITCHED_CALL)
 134 #define aes_off 0
 135 #endif
 136
 137 void sha1_block_data_order (void *c,const void *p,size_t len);
 138
 139 static void sha1_update(SHA_CTX *c,const void *data,size_t len)
 140 {       const unsigned char *ptr = data;
 141         size_t res;
 142
 143         if ((res = c->num)) {
 144                 res = SHA_CBLOCK-res;
 145                 if (len<res) res=len;
 146                 SHA1_Update (c,ptr,res);
 147                 ptr += res;
 148                 len -= res;
 149         }
 150
 151         res = len % SHA_CBLOCK;
 152         len -= res;
 153
 154         if (len) {
 155                 sha1_block_data_order(c,ptr,len/SHA_CBLOCK);
 156
 157                 ptr += len;
 158                 c->Nh += len>>29;
 159                 c->Nl += len<<=3;
 160                 if (c->Nl<(unsigned int)len) c->Nh++;
 161         }
 162
 163         if (res)
 164                 SHA1_Update(c,ptr,res);
 165 }
 166
 167 #define SHA1_Update sha1_update
 168
 169 static int aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 170                       const unsigned char *in, size_t len)
 171         {
 172         EVP_AES_HMAC_SHA1 *key = data(ctx);
 173         unsigned int l;
 174         size_t  plen = key->payload_length,
 175                 iv = 0,         /* explicit IV in TLS 1.1 and later */
 176                 sha_off = 0;
 177 #if defined(STITCHED_CALL)
 178         size_t  aes_off = 0,
 179                 blocks;
 180
 181         sha_off = SHA_CBLOCK-key->md.num;
 182 #endif
 183
 184         if (len%AES_BLOCK_SIZE) return 0;
 185
 186         if (ctx->encrypt) {
 187                 if (plen==0)
 188                         plen = len;
 189                 else if (len!=((plen+SHA_DIGEST_LENGTH+AES_BLOCK_SIZE)&-AES_BLOCK_SIZE))
 190                         return 0;
 191                 else if (key->aux.tls_ver >= TLS1_1_VERSION)
 192                         iv = AES_BLOCK_SIZE;
 193
 194 #if defined(STITCHED_CALL)
 195                 if (plen>(sha_off+iv) && (blocks=(plen-(sha_off+iv))/SHA_CBLOCK)) {
 196                         SHA1_Update(&key->md,in+iv,sha_off);
 197
 198                         aesni_cbc_sha1_enc(in,out,blocks,&key->ks,
 199                                 ctx->iv,&key->md,in+iv+sha_off);
 200                         blocks *= SHA_CBLOCK;
 201                         aes_off += blocks;
 202                         sha_off += blocks;
 203                         key->md.Nh += blocks>>29;
 204                         key->md.Nl += blocks<<=3;
 205                         if (key->md.Nl<(unsigned int)blocks) key->md.Nh++;
 206                 } else {
 207                         sha_off = 0;
 208                 }
 209 #endif
 210                 sha_off += iv;
 211                 SHA1_Update(&key->md,in+sha_off,plen-sha_off);
 212
 213                 if (plen!=len)  {       /* "TLS" mode of operation */
 214                         if (in!=out)
 215                                 memcpy(out+aes_off,in+aes_off,plen-aes_off);
 216
 217                         /* calculate HMAC and append it to payload */
 218                         SHA1_Final(out+plen,&key->md);
 219                         key->md = key->tail;
 220                         SHA1_Update(&key->md,out+plen,SHA_DIGEST_LENGTH);
 221                         SHA1_Final(out+plen,&key->md);
 222
 223                         /* pad the payload|hmac */
 224                         plen += SHA_DIGEST_LENGTH;
 225                         for (l=len-plen-1;plen<len;plen++) out[plen]=l;
 226                         /* encrypt HMAC|padding at once */
 227                         aesni_cbc_encrypt(out+aes_off,out+aes_off,len-aes_off,
 228                                         &key->ks,ctx->iv,1);
 229                 } else {
 230                         aesni_cbc_encrypt(in+aes_off,out+aes_off,len-aes_off,
 231                                         &key->ks,ctx->iv,1);
 232                 }
 233         } else {
 234                 unsigned char mac[SHA_DIGEST_LENGTH];
 235
 236                 /* decrypt HMAC|padding at once */
 237                 aesni_cbc_encrypt(in,out,len,
 238                                 &key->ks,ctx->iv,0);
 239
 240                 if (plen) {     /* "TLS" mode of operation */
 241                         /* figure out payload length */
 242                         if (len<(size_t)(out[len-1]+1+SHA_DIGEST_LENGTH))
 243                                 return 0;
 244
 245                         len -= (out[len-1]+1+SHA_DIGEST_LENGTH);
 246
 247                         if ((key->aux.tls_aad[plen-4]<<8|key->aux.tls_aad[plen-3])
 248                             >= TLS1_1_VERSION) {
 249                                 len -= AES_BLOCK_SIZE;
 250                                 iv = AES_BLOCK_SIZE;
 251                         }
 252
 253                         key->aux.tls_aad[plen-2] = len>>8;
 254                         key->aux.tls_aad[plen-1] = len;
 255
 256                         /* calculate HMAC and verify it */
 257                         key->md = key->head;
 258                         SHA1_Update(&key->md,key->aux.tls_aad,plen);
 259                         SHA1_Update(&key->md,out+iv,len);
 260                         SHA1_Final(mac,&key->md);
 261
 262                         key->md = key->tail;
 263                         SHA1_Update(&key->md,mac,SHA_DIGEST_LENGTH);
 264                         SHA1_Final(mac,&key->md);
 265
 266                         if (memcmp(out+iv+len,mac,SHA_DIGEST_LENGTH))
 267                                 return 0;
 268                 } else {
 269                         SHA1_Update(&key->md,out,len);
 270                 }
 271         }
 272
 273         key->payload_length = 0;
 274
 275         return 1;
 276         }
 277
 278 static int aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 279         {
 280         EVP_AES_HMAC_SHA1 *key = data(ctx);
 281
 282         switch (type)
 283                 {
 284         case EVP_CTRL_AEAD_SET_MAC_KEY:
 285                 {
 286                 unsigned int  i;
 287                 unsigned char hmac_key[64];
 288
 289                 memset (hmac_key,0,sizeof(hmac_key));
 290
 291                 if (arg > (int)sizeof(hmac_key)) {
 292                         SHA1_Init(&key->head);
 293                         SHA1_Update(&key->head,ptr,arg);
 294                         SHA1_Final(hmac_key,&key->head);
 295                 } else {
 296                         memcpy(hmac_key,ptr,arg);
 297                 }
 298
 299                 for (i=0;i<sizeof(hmac_key);i++)
 300                         hmac_key[i] ^= 0x36;            /* ipad */
 301                 SHA1_Init(&key->head);
 302                 SHA1_Update(&key->head,hmac_key,sizeof(hmac_key));
 303
 304                 for (i=0;i<sizeof(hmac_key);i++)
 305                         hmac_key[i] ^= 0x36^0x5c;       /* opad */
 306                 SHA1_Init(&key->tail);
 307                 SHA1_Update(&key->tail,hmac_key,sizeof(hmac_key));
 308
 309                 return 1;
 310                 }
 311         case EVP_CTRL_AEAD_TLS1_AAD:
 312                 {
 313                 unsigned char *p=ptr;
 314                 unsigned int   len=p[arg-2]<<8|p[arg-1];
 315
 316                 if (ctx->encrypt)
 317                         {
 318                         key->payload_length = len;
 319                         if ((key->aux.tls_ver=p[arg-4]<<8|p[arg-3]) >= TLS1_1_VERSION) {
 320                                 len -= AES_BLOCK_SIZE;
 321                                 p[arg-2] = len>>8;
 322                                 p[arg-1] = len;
 323                         }
 324                         key->md = key->head;
 325                         SHA1_Update(&key->md,p,arg);
 326
 327                         return (int)(((len+SHA_DIGEST_LENGTH+AES_BLOCK_SIZE)&-AES_BLOCK_SIZE)
 328                                 - len);
 329                         }
 330                 else
 331                         {
 332                         if (arg>13) arg = 13;
 333                         memcpy(key->aux.tls_aad,ptr,arg);
 334                         key->payload_length = arg;
 335
 336                         return SHA_DIGEST_LENGTH;
 337                         }
 338                 }
 339         default:
 340                 return -1;
 341                 }
 342         }
 343
 344 static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher =
 345         {
 346 #ifdef NID_aes_128_cbc_hmac_sha1
 347         NID_aes_128_cbc_hmac_sha1,
 348 #else
 349         NID_undef,
 350 #endif
 351         16,16,16,
 352         EVP_CIPH_CBC_MODE|EVP_CIPH_FLAG_DEFAULT_ASN1|EVP_CIPH_FLAG_AEAD_CIPHER,
 353         aesni_cbc_hmac_sha1_init_key,
 354         aesni_cbc_hmac_sha1_cipher,
 355         NULL,
 356         sizeof(EVP_AES_HMAC_SHA1),
 357         EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_set_asn1_iv,
 358         EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_get_asn1_iv,
 359         aesni_cbc_hmac_sha1_ctrl,
 360         NULL
 361         };
 362
 363 static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher =
 364         {
 365 #ifdef NID_aes_256_cbc_hmac_sha1
 366         NID_aes_256_cbc_hmac_sha1,
 367 #else
 368         NID_undef,
 369 #endif
 370         16,32,16,
 371         EVP_CIPH_CBC_MODE|EVP_CIPH_FLAG_DEFAULT_ASN1|EVP_CIPH_FLAG_AEAD_CIPHER,
 372         aesni_cbc_hmac_sha1_init_key,
 373         aesni_cbc_hmac_sha1_cipher,
 374         NULL,
 375         sizeof(EVP_AES_HMAC_SHA1),
 376         EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_set_asn1_iv,
 377         EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_get_asn1_iv,
 378         aesni_cbc_hmac_sha1_ctrl,
 379         NULL
 380         };
 381
 382 const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void)
 383         {
 384         return(OPENSSL_ia32cap_P[1]&AESNI_CAPABLE?
 385                 &aesni_128_cbc_hmac_sha1_cipher:NULL);
 386         }
 387
 388 const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void)
 389         {
 390         return(OPENSSL_ia32cap_P[1]&AESNI_CAPABLE?
 391                 &aesni_256_cbc_hmac_sha1_cipher:NULL);
 392         }
 393 #else
 394 const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void)
 395         {
 396         return NULL;
 397         }
 398 const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void)
 399         {
 400         return NULL;
 401         }
 402 #endif
 403 #endif