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 (at) 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 #include "evp_locl.h" 62 63 #ifndef EVP_CIPH_FLAG_AEAD_CIPHER 64 #define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000 65 #define EVP_CTRL_AEAD_TLS1_AAD 0x16 66 #define EVP_CTRL_AEAD_SET_MAC_KEY 0x17 67 #endif 68 69 #if !defined(EVP_CIPH_FLAG_DEFAULT_ASN1) 70 #define EVP_CIPH_FLAG_DEFAULT_ASN1 0 71 #endif 72 73 #define TLS1_1_VERSION 0x0302 74 75 typedef struct 76 { 77 AES_KEY ks; 78 SHA_CTX head,tail,md; 79 size_t payload_length; /* AAD length in decrypt case */ 80 union { 81 unsigned int tls_ver; 82 unsigned char tls_aad[16]; /* 13 used */ 83 } aux; 84 } EVP_AES_HMAC_SHA1; 85 86 #define NO_PAYLOAD_LENGTH ((size_t)-1) 87 88 #if defined(AES_ASM) && ( \ 89 defined(__x86_64) || defined(__x86_64__) || \ 90 defined(_M_AMD64) || defined(_M_X64) || \ 91 defined(__INTEL__) ) 92 93 extern unsigned int OPENSSL_ia32cap_P[2]; 94 #define AESNI_CAPABLE (1<<(57-32)) 95 96 int aesni_set_encrypt_key(const unsigned char *userKey, int bits, 97 AES_KEY *key); 98 int aesni_set_decrypt_key(const unsigned char *userKey, int bits, 99 AES_KEY *key); 100 101 void aesni_cbc_encrypt(const unsigned char *in, 102 unsigned char *out, 103 size_t length, 104 const AES_KEY *key, 105 unsigned char *ivec, int enc); 106 107 void aesni_cbc_sha1_enc (const void *inp, void *out, size_t blocks, 108 const AES_KEY *key, unsigned char iv[16], 109 SHA_CTX *ctx,const void *in0); 110 111 #define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data) 112 113 static int aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, 114 const unsigned char *inkey, 115 const unsigned char *iv, int enc) 116 { 117 EVP_AES_HMAC_SHA1 *key = data(ctx); 118 int ret; 119 120 if (enc) 121 ret=aesni_set_encrypt_key(inkey,ctx->key_len*8,&key->ks); 122 else 123 ret=aesni_set_decrypt_key(inkey,ctx->key_len*8,&key->ks); 124 125 SHA1_Init(&key->head); /* handy when benchmarking */ 126 key->tail = key->head; 127 key->md = key->head; 128 129 key->payload_length = NO_PAYLOAD_LENGTH; 130 131 return ret<0?0:1; 132 } 133 134 #define STITCHED_CALL 135 136 #if !defined(STITCHED_CALL) 137 #define aes_off 0 138 #endif 139 140 void sha1_block_data_order (void *c,const void *p,size_t len); 141 142 static void sha1_update(SHA_CTX *c,const void *data,size_t len) 143 { const unsigned char *ptr = data; 144 size_t res; 145 146 if ((res = c->num)) { 147 res = SHA_CBLOCK-res; 148 if (len<res) res=len; 149 SHA1_Update (c,ptr,res); 150 ptr += res; 151 len -= res; 152 } 153 154 res = len % SHA_CBLOCK; 155 len -= res; 156 157 if (len) { 158 sha1_block_data_order(c,ptr,len/SHA_CBLOCK); 159 160 ptr += len; 161 c->Nh += len>>29; 162 c->Nl += len<<=3; 163 if (c->Nl<(unsigned int)len) c->Nh++; 164 } 165 166 if (res) 167 SHA1_Update(c,ptr,res); 168 } 169 170 #define SHA1_Update sha1_update 171 172 static int aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 173 const unsigned char *in, size_t len) 174 { 175 EVP_AES_HMAC_SHA1 *key = data(ctx); 176 unsigned int l; 177 size_t plen = key->payload_length, 178 iv = 0, /* explicit IV in TLS 1.1 and later */ 179 sha_off = 0; 180 #if defined(STITCHED_CALL) 181 size_t aes_off = 0, 182 blocks; 183 184 sha_off = SHA_CBLOCK-key->md.num; 185 #endif 186 187 if (len%AES_BLOCK_SIZE) return 0; 188 189 if (ctx->encrypt) { 190 if (plen==NO_PAYLOAD_LENGTH) 191 plen = len; 192 else if (len!=((plen+SHA_DIGEST_LENGTH+AES_BLOCK_SIZE)&-AES_BLOCK_SIZE)) 193 return 0; 194 else if (key->aux.tls_ver >= TLS1_1_VERSION) 195 iv = AES_BLOCK_SIZE; 196 197 #if defined(STITCHED_CALL) 198 if (plen>(sha_off+iv) && (blocks=(plen-(sha_off+iv))/SHA_CBLOCK)) { 199 SHA1_Update(&key->md,in+iv,sha_off); 200 201 aesni_cbc_sha1_enc(in,out,blocks,&key->ks, 202 ctx->iv,&key->md,in+iv+sha_off); 203 blocks *= SHA_CBLOCK; 204 aes_off += blocks; 205 sha_off += blocks; 206 key->md.Nh += blocks>>29; 207 key->md.Nl += blocks<<=3; 208 if (key->md.Nl<(unsigned int)blocks) key->md.Nh++; 209 } else { 210 sha_off = 0; 211 } 212 #endif 213 sha_off += iv; 214 SHA1_Update(&key->md,in+sha_off,plen-sha_off); 215 216 if (plen!=len) { /* "TLS" mode of operation */ 217 if (in!=out) 218 memcpy(out+aes_off,in+aes_off,plen-aes_off); 219 220 /* calculate HMAC and append it to payload */ 221 SHA1_Final(out+plen,&key->md); 222 key->md = key->tail; 223 SHA1_Update(&key->md,out+plen,SHA_DIGEST_LENGTH); 224 SHA1_Final(out+plen,&key->md); 225 226 /* pad the payload|hmac */ 227 plen += SHA_DIGEST_LENGTH; 228 for (l=len-plen-1;plen<len;plen++) out[plen]=l; 229 /* encrypt HMAC|padding at once */ 230 aesni_cbc_encrypt(out+aes_off,out+aes_off,len-aes_off, 231 &key->ks,ctx->iv,1); 232 } else { 233 aesni_cbc_encrypt(in+aes_off,out+aes_off,len-aes_off, 234 &key->ks,ctx->iv,1); 235 } 236 } else { 237 unsigned char mac[SHA_DIGEST_LENGTH]; 238 239 /* decrypt HMAC|padding at once */ 240 aesni_cbc_encrypt(in,out,len, 241 &key->ks,ctx->iv,0); 242 243 if (plen) { /* "TLS" mode of operation */ 244 /* figure out payload length */ 245 if (len<(size_t)(out[len-1]+1+SHA_DIGEST_LENGTH)) 246 return 0; 247 248 len -= (out[len-1]+1+SHA_DIGEST_LENGTH); 249 250 if ((key->aux.tls_aad[plen-4]<<8|key->aux.tls_aad[plen-3]) 251 >= TLS1_1_VERSION) { 252 len -= AES_BLOCK_SIZE; 253 iv = AES_BLOCK_SIZE; 254 } 255 256 key->aux.tls_aad[plen-2] = len>>8; 257 key->aux.tls_aad[plen-1] = len; 258 259 /* calculate HMAC and verify it */ 260 key->md = key->head; 261 SHA1_Update(&key->md,key->aux.tls_aad,plen); 262 SHA1_Update(&key->md,out+iv,len); 263 SHA1_Final(mac,&key->md); 264 265 key->md = key->tail; 266 SHA1_Update(&key->md,mac,SHA_DIGEST_LENGTH); 267 SHA1_Final(mac,&key->md); 268 269 if (memcmp(out+iv+len,mac,SHA_DIGEST_LENGTH)) 270 return 0; 271 } else { 272 SHA1_Update(&key->md,out,len); 273 } 274 } 275 276 key->payload_length = NO_PAYLOAD_LENGTH; 277 278 return 1; 279 } 280 281 static int aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 282 { 283 EVP_AES_HMAC_SHA1 *key = data(ctx); 284 285 switch (type) 286 { 287 case EVP_CTRL_AEAD_SET_MAC_KEY: 288 { 289 unsigned int i; 290 unsigned char hmac_key[64]; 291 292 memset (hmac_key,0,sizeof(hmac_key)); 293 294 if (arg > (int)sizeof(hmac_key)) { 295 SHA1_Init(&key->head); 296 SHA1_Update(&key->head,ptr,arg); 297 SHA1_Final(hmac_key,&key->head); 298 } else { 299 memcpy(hmac_key,ptr,arg); 300 } 301 302 for (i=0;i<sizeof(hmac_key);i++) 303 hmac_key[i] ^= 0x36; /* ipad */ 304 SHA1_Init(&key->head); 305 SHA1_Update(&key->head,hmac_key,sizeof(hmac_key)); 306 307 for (i=0;i<sizeof(hmac_key);i++) 308 hmac_key[i] ^= 0x36^0x5c; /* opad */ 309 SHA1_Init(&key->tail); 310 SHA1_Update(&key->tail,hmac_key,sizeof(hmac_key)); 311 312 return 1; 313 } 314 case EVP_CTRL_AEAD_TLS1_AAD: 315 { 316 unsigned char *p=ptr; 317 unsigned int len=p[arg-2]<<8|p[arg-1]; 318 319 if (ctx->encrypt) 320 { 321 key->payload_length = len; 322 if ((key->aux.tls_ver=p[arg-4]<<8|p[arg-3]) >= TLS1_1_VERSION) { 323 len -= AES_BLOCK_SIZE; 324 p[arg-2] = len>>8; 325 p[arg-1] = len; 326 } 327 key->md = key->head; 328 SHA1_Update(&key->md,p,arg); 329 330 return (int)(((len+SHA_DIGEST_LENGTH+AES_BLOCK_SIZE)&-AES_BLOCK_SIZE) 331 - len); 332 } 333 else 334 { 335 if (arg>13) arg = 13; 336 memcpy(key->aux.tls_aad,ptr,arg); 337 key->payload_length = arg; 338 339 return SHA_DIGEST_LENGTH; 340 } 341 } 342 default: 343 return -1; 344 } 345 } 346 347 static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = 348 { 349 #ifdef NID_aes_128_cbc_hmac_sha1 350 NID_aes_128_cbc_hmac_sha1, 351 #else 352 NID_undef, 353 #endif 354 16,16,16, 355 EVP_CIPH_CBC_MODE|EVP_CIPH_FLAG_DEFAULT_ASN1|EVP_CIPH_FLAG_AEAD_CIPHER, 356 aesni_cbc_hmac_sha1_init_key, 357 aesni_cbc_hmac_sha1_cipher, 358 NULL, 359 sizeof(EVP_AES_HMAC_SHA1), 360 EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_set_asn1_iv, 361 EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_get_asn1_iv, 362 aesni_cbc_hmac_sha1_ctrl, 363 NULL 364 }; 365 366 static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = 367 { 368 #ifdef NID_aes_256_cbc_hmac_sha1 369 NID_aes_256_cbc_hmac_sha1, 370 #else 371 NID_undef, 372 #endif 373 16,32,16, 374 EVP_CIPH_CBC_MODE|EVP_CIPH_FLAG_DEFAULT_ASN1|EVP_CIPH_FLAG_AEAD_CIPHER, 375 aesni_cbc_hmac_sha1_init_key, 376 aesni_cbc_hmac_sha1_cipher, 377 NULL, 378 sizeof(EVP_AES_HMAC_SHA1), 379 EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_set_asn1_iv, 380 EVP_CIPH_FLAG_DEFAULT_ASN1?NULL:EVP_CIPHER_get_asn1_iv, 381 aesni_cbc_hmac_sha1_ctrl, 382 NULL 383 }; 384 385 const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void) 386 { 387 return(OPENSSL_ia32cap_P[1]&AESNI_CAPABLE? 388 &aesni_128_cbc_hmac_sha1_cipher:NULL); 389 } 390 391 const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void) 392 { 393 return(OPENSSL_ia32cap_P[1]&AESNI_CAPABLE? 394 &aesni_256_cbc_hmac_sha1_cipher:NULL); 395 } 396 #else 397 const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void) 398 { 399 return NULL; 400 } 401 const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void) 402 { 403 return NULL; 404 } 405 #endif 406 #endif 407
