crypto/evp/e_aes.c

   1 /* ====================================================================
   2  * Copyright (c) 2001-2011 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  *    openssl-core@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
  51 #define OPENSSL_FIPSAPI
  52
  53 #include <openssl/opensslconf.h>
  54 #ifndef OPENSSL_NO_AES
  55 #include <openssl/evp.h>
  56 #include <openssl/err.h>
  57 #include <string.h>
  58 #include <assert.h>
  59 #include <openssl/aes.h>
  60 #include "evp_locl.h"
  61 #include "modes_lcl.h"
  62 #include <openssl/rand.h>
  63
  64 typedef struct
  65         {
  66         AES_KEY ks;
  67         } EVP_AES_KEY;
  68
  69 typedef struct
  70         {
  71         AES_KEY ks;             /* AES key schedule to use */
  72         int key_set;            /* Set if key initialised */
  73         int iv_set;             /* Set if an iv is set */
  74         GCM128_CONTEXT gcm;
  75         unsigned char *iv;      /* Temporary IV store */
  76         int ivlen;              /* IV length */
  77         int taglen;
  78         int iv_gen;             /* It is OK to generate IVs */
  79         int tls_aad_len;        /* TLS AAD length */
  80         } EVP_AES_GCM_CTX;
  81
  82 typedef struct
  83         {
  84         AES_KEY ks1, ks2;       /* AES key schedules to use */
  85         XTS128_CONTEXT xts;
  86         } EVP_AES_XTS_CTX;
  87
  88 typedef struct
  89         {
  90         AES_KEY ks;             /* AES key schedule to use */
  91         int key_set;            /* Set if key initialised */
  92         int iv_set;             /* Set if an iv is set */
  93         int tag_set;            /* Set if tag is valid */
  94         int len_set;            /* Set if message length set */
  95         int L, M;               /* L and M parameters from RFC3610 */
  96         CCM128_CONTEXT ccm;
  97         } EVP_AES_CCM_CTX;
  98
  99 #define MAXBITCHUNK     ((size_t)1<<(sizeof(size_t)*8-4))
 100
 101 #if     defined(AES_ASM) && !defined(I386_ONLY) &&      (  \
 102         ((defined(__i386)       || defined(__i386__)    || \
 103           defined(_M_IX86)) && defined(OPENSSL_IA32_SSE2))|| \
 104         defined(__x86_64)       || defined(__x86_64__)  || \
 105         defined(_M_AMD64)       || defined(_M_X64)      || \
 106         defined(__INTEL__)                              )
 107 /*
 108  * AES-NI section
 109  */
 110 extern unsigned int OPENSSL_ia32cap_P[2];
 111 #define AESNI_CAPABLE   (1<<(57-32))
 112
 113 int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
 114                         AES_KEY *key);
 115 int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
 116                         AES_KEY *key);
 117
 118 void aesni_encrypt(const unsigned char *in, unsigned char *out,
 119                         const AES_KEY *key);
 120 void aesni_decrypt(const unsigned char *in, unsigned char *out,
 121                         const AES_KEY *key);
 122
 123 void aesni_ecb_encrypt(const unsigned char *in,
 124                         unsigned char *out,
 125                         size_t length,
 126                         const AES_KEY *key,
 127                         int enc);
 128 void aesni_cbc_encrypt(const unsigned char *in,
 129                         unsigned char *out,
 130                         size_t length,
 131                         const AES_KEY *key,
 132                         unsigned char *ivec, int enc);
 133
 134 void aesni_ctr32_encrypt_blocks(const unsigned char *in,
 135                         unsigned char *out,
 136                         size_t blocks,
 137                         const void *key,
 138                         const unsigned char *ivec);
 139
 140 void aesni_xts_encrypt(const unsigned char *in,
 141                         unsigned char *out,
 142                         size_t length,
 143                         const AES_KEY *key1, const AES_KEY *key2,
 144                         const unsigned char iv[16]);
 145
 146 void aesni_xts_decrypt(const unsigned char *in,
 147                         unsigned char *out,
 148                         size_t length,
 149                         const AES_KEY *key1, const AES_KEY *key2,
 150                         const unsigned char iv[16]);
 151
 152 void aesni_ccm64_encrypt_blocks (const unsigned char *in,
 153                         unsigned char *out,
 154                         size_t blocks,
 155                         const void *key,
 156                         const unsigned char ivec[16],
 157                         unsigned char cmac[16]);
 158
 159 void aesni_ccm64_decrypt_blocks (const unsigned char *in,
 160                         unsigned char *out,
 161                         size_t blocks,
 162                         const void *key,
 163                         const unsigned char ivec[16],
 164                         unsigned char cmac[16]);
 165
 166 static int aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 167                    const unsigned char *iv, int enc)
 168         {
 169         int ret;
 170
 171         if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
 172             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
 173             && !enc)
 174                 ret = aesni_set_decrypt_key(key, ctx->key_len*8, ctx->cipher_data);
 175         else
 176                 ret = aesni_set_encrypt_key(key, ctx->key_len*8, ctx->cipher_data);
 177
 178         if(ret < 0)
 179                 {
 180                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
 181                 return 0;
 182                 }
 183
 184         return 1;
 185         }
 186
 187 static int aesni_cbc_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 188         const unsigned char *in, size_t len)
 189 {
 190         aesni_cbc_encrypt(in,out,len,ctx->cipher_data,ctx->iv,ctx->encrypt);
 191
 192         return 1;
 193 }
 194
 195 static int aesni_ecb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 196         const unsigned char *in, size_t len)
 197 {
 198         size_t  bl = ctx->cipher->block_size;
 199
 200         if (len<bl)     return 1;
 201
 202         aesni_ecb_encrypt(in,out,len,ctx->cipher_data,ctx->encrypt);
 203
 204         return 1;
 205 }
 206
 207 static int aesni_ofb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 208         const unsigned char *in,size_t len)
 209 {
 210         CRYPTO_ofb128_encrypt(in,out,len,ctx->cipher_data,
 211                         ctx->iv,&ctx->num,
 212                         (block128_f)aesni_encrypt);
 213         return 1;
 214 }
 215
 216 static int aesni_cfb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 217         const unsigned char *in,size_t len)
 218 {
 219         CRYPTO_cfb128_encrypt(in,out,len,ctx->cipher_data,
 220                         ctx->iv,&ctx->num,ctx->encrypt,
 221                         (block128_f)aesni_encrypt);
 222         return 1;
 223 }
 224
 225 static int aesni_cfb8_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 226         const unsigned char *in,size_t len)
 227 {
 228         CRYPTO_cfb128_8_encrypt(in,out,len,ctx->cipher_data,
 229                         ctx->iv,&ctx->num,ctx->encrypt,
 230                         (block128_f)aesni_encrypt);
 231         return 1;
 232 }
 233
 234 static int aesni_cfb1_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 235         const unsigned char *in,size_t len)
 236 {
 237         if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
 238                 CRYPTO_cfb128_1_encrypt(in,out,len,ctx->cipher_data,
 239                         ctx->iv,&ctx->num,ctx->encrypt,
 240                         (block128_f)aesni_encrypt);
 241                 return 1;
 242         }
 243
 244         while (len>=MAXBITCHUNK) {
 245                 CRYPTO_cfb128_1_encrypt(in,out,MAXBITCHUNK*8,ctx->cipher_data,
 246                         ctx->iv,&ctx->num,ctx->encrypt,
 247                         (block128_f)aesni_encrypt);
 248                 len-=MAXBITCHUNK;
 249         }
 250         if (len)
 251                 CRYPTO_cfb128_1_encrypt(in,out,len*8,ctx->cipher_data,
 252                         ctx->iv,&ctx->num,ctx->encrypt,
 253                         (block128_f)aesni_encrypt);
 254
 255         return 1;
 256 }
 257
 258 static int aesni_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 259                 const unsigned char *in, size_t len)
 260 {
 261         unsigned int num;
 262         num = ctx->num;
 263
 264         CRYPTO_ctr128_encrypt_ctr32(in,out,len,
 265                         ctx->cipher_data,ctx->iv,ctx->buf,&num,
 266                         (ctr128_f)aesni_ctr32_encrypt_blocks);
 267
 268         ctx->num = (size_t)num;
 269         return 1;
 270 }
 271
 272 static int aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 273                         const unsigned char *iv, int enc)
 274         {
 275         EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
 276         if (!iv && !key)
 277                 return 1;
 278         if (key)
 279                 {
 280                 aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
 281                 CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
 282                                 (block128_f)aesni_encrypt);
 283                 /* If we have an iv can set it directly, otherwise use
 284                  * saved IV.
 285                  */
 286                 if (iv == NULL && gctx->iv_set)
 287                         iv = gctx->iv;
 288                 if (iv)
 289                         {
 290                         CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
 291                         gctx->iv_set = 1;
 292                         }
 293                 gctx->key_set = 1;
 294                 }
 295         else
 296                 {
 297                 /* If key set use IV, otherwise copy */
 298                 if (gctx->key_set)
 299                         CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
 300                 else
 301                         memcpy(gctx->iv, iv, gctx->ivlen);
 302                 gctx->iv_set = 1;
 303                 gctx->iv_gen = 0;
 304                 }
 305         return 1;
 306         }
 307
 308 static int aesni_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 309                 const unsigned char *in, size_t len)
 310         {
 311         EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
 312         /* If not set up, return error */
 313         if (!gctx->iv_set && !gctx->key_set)
 314                 return -1;
 315         if (!ctx->encrypt && gctx->taglen < 0)
 316                 return -1;
 317         if (in)
 318                 {
 319                 if (out == NULL)
 320                         {
 321                         if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
 322                                 return -1;
 323                         }
 324                 else if (ctx->encrypt)
 325                         {
 326                         if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm,
 327                                         in, out, len,
 328                                         aesni_ctr32_encrypt_blocks))
 329                                 return -1;
 330                         }
 331                 else
 332                         {
 333                         if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm,
 334                                         in, out, len,
 335                                         aesni_ctr32_encrypt_blocks))
 336                                 return -1;
 337                         }
 338                 return len;
 339                 }
 340         else
 341                 {
 342                 if (!ctx->encrypt)
 343                         {
 344                         if (CRYPTO_gcm128_finish(&gctx->gcm,
 345                                         ctx->buf, gctx->taglen) != 0)
 346                                 return -1;
 347                         gctx->iv_set = 0;
 348                         return 0;
 349                         }
 350                 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
 351                 gctx->taglen = 16;
 352                 /* Don't reuse the IV */
 353                 gctx->iv_set = 0;
 354                 return 0;
 355                 }
 356
 357         }
 358
 359 static int aesni_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 360                         const unsigned char *iv, int enc)
 361         {
 362         EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
 363         if (!iv && !key)
 364                 return 1;
 365
 366         if (key)
 367                 {
 368                 /* key_len is two AES keys */
 369                 if (enc)
 370                         {
 371                         aesni_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
 372                         xctx->xts.block1 = (block128_f)aesni_encrypt;
 373                         }
 374                 else
 375                         {
 376                         aesni_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
 377                         xctx->xts.block1 = (block128_f)aesni_decrypt;
 378                         }
 379
 380                 aesni_set_encrypt_key(key + ctx->key_len/2,
 381                                                 ctx->key_len * 4, &xctx->ks2);
 382                 xctx->xts.block2 = (block128_f)aesni_encrypt;
 383
 384                 xctx->xts.key1 = &xctx->ks1;
 385                 }
 386
 387         if (iv)
 388                 {
 389                 xctx->xts.key2 = &xctx->ks2;
 390                 memcpy(ctx->iv, iv, 16);
 391                 }
 392
 393         return 1;
 394         }
 395
 396 static int aesni_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 397                 const unsigned char *in, size_t len)
 398         {
 399         EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
 400         if (!xctx->xts.key1 || !xctx->xts.key2)
 401                 return -1;
 402         if (!out || !in)
 403                 return -1;
 404 #ifdef OPENSSL_FIPS
 405         /* Requirement of SP800-38E */
 406         if (FIPS_module_mode() && !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW) &&
 407                         (len > (1L<<20)*16))
 408                 {
 409                 EVPerr(EVP_F_AES_XTS, EVP_R_TOO_LARGE);
 410                 return -1;
 411                 }
 412 #endif
 413         if (ctx->encrypt)
 414                 aesni_xts_encrypt(in, out, len,
 415                         xctx->xts.key1, xctx->xts.key2, ctx->iv);
 416         else
 417                 aesni_xts_decrypt(in, out, len,
 418                         xctx->xts.key1, xctx->xts.key2, ctx->iv);
 419
 420         return len;
 421         }
 422
 423 static int aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 424                         const unsigned char *iv, int enc)
 425         {
 426         EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
 427         if (!iv && !key)
 428                 return 1;
 429         if (key)
 430                 {
 431                 aesni_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
 432                 CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
 433                                         &cctx->ks, (block128_f)aesni_encrypt);
 434                 cctx->key_set = 1;
 435                 }
 436         if (iv)
 437                 {
 438                 memcpy(ctx->iv, iv, 15 - cctx->L);
 439                 cctx->iv_set = 1;
 440                 }
 441         return 1;
 442         }
 443
 444 static int aesni_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 445                 const unsigned char *in, size_t len)
 446         {
 447         EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
 448         CCM128_CONTEXT *ccm = &cctx->ccm;
 449         /* If not set up, return error */
 450         if (!cctx->iv_set && !cctx->key_set)
 451                 return -1;
 452         if (!ctx->encrypt && !cctx->tag_set)
 453                 return -1;
 454         if (!out)
 455                 {
 456                 if (!in)
 457                         {
 458                         if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,len))
 459                                 return -1;
 460                         cctx->len_set = 1;
 461                         return len;
 462                         }
 463                 /* If have AAD need message length */
 464                 if (!cctx->len_set && len)
 465                         return -1;
 466                 CRYPTO_ccm128_aad(ccm, in, len);
 467                 return len;
 468                 }
 469         /* EVP_*Final() doesn't return any data */
 470         if (!in)
 471                 return 0;
 472         /* If not set length yet do it */
 473         if (!cctx->len_set)
 474                 {
 475                 if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
 476                         return -1;
 477                 cctx->len_set = 1;
 478                 }
 479         if (ctx->encrypt)
 480                 {
 481                 if (CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len,
 482                                 aesni_ccm64_encrypt_blocks))
 483                         return -1;
 484                 cctx->tag_set = 1;
 485                 return len;
 486                 }
 487         else
 488                 {
 489                 int rv = -1;
 490                 if (!CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len,
 491                                 aesni_ccm64_decrypt_blocks))
 492                         {
 493                         unsigned char tag[16];
 494                         if (CRYPTO_ccm128_tag(ccm, tag, cctx->M))
 495                                 {
 496                                 if (!memcmp(tag, ctx->buf, cctx->M))
 497                                         rv = len;
 498                                 }
 499                         }
 500                 if (rv == -1)
 501                         OPENSSL_cleanse(out, len);
 502                 cctx->iv_set = 0;
 503                 cctx->tag_set = 0;
 504                 cctx->len_set = 0;
 505                 return rv;
 506                 }
 507
 508         }
 509
 510 #define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
 511 static const EVP_CIPHER aesni_##keylen##_##mode = { \
 512         nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
 513         flags|EVP_CIPH_##MODE##_MODE,   \
 514         aesni_init_key,                 \
 515         aesni_##mode##_cipher,          \
 516         NULL,                           \
 517         sizeof(EVP_AES_KEY),            \
 518         NULL,NULL,NULL,NULL }; \
 519 static const EVP_CIPHER aes_##keylen##_##mode = { \
 520         nid##_##keylen##_##nmode,blocksize,     \
 521         keylen/8,ivlen, \
 522         flags|EVP_CIPH_##MODE##_MODE,   \
 523         aes_init_key,                   \
 524         aes_##mode##_cipher,            \
 525         NULL,                           \
 526         sizeof(EVP_AES_KEY),            \
 527         NULL,NULL,NULL,NULL }; \
 528 const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
 529 { return (OPENSSL_ia32cap_P[1]&AESNI_CAPABLE)? \
 530   &aesni_##keylen##_##mode:&aes_##keylen##_##mode; }
 531
 532 #define BLOCK_CIPHER_custom(nid,keylen,blocksize,ivlen,mode,MODE,flags) \
 533 static const EVP_CIPHER aesni_##keylen##_##mode = { \
 534         nid##_##keylen##_##mode,blocksize, \
 535         (EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
 536         flags|EVP_CIPH_##MODE##_MODE,   \
 537         aesni_##mode##_init_key,        \
 538         aesni_##mode##_cipher,          \
 539         aes_##mode##_cleanup,           \
 540         sizeof(EVP_AES_##MODE##_CTX),   \
 541         NULL,NULL,aes_##mode##_ctrl,NULL }; \
 542 static const EVP_CIPHER aes_##keylen##_##mode = { \
 543         nid##_##keylen##_##mode,blocksize, \
 544         (EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
 545         flags|EVP_CIPH_##MODE##_MODE,   \
 546         aes_##mode##_init_key,          \
 547         aes_##mode##_cipher,            \
 548         aes_##mode##_cleanup,           \
 549         sizeof(EVP_AES_##MODE##_CTX),   \
 550         NULL,NULL,aes_##mode##_ctrl,NULL }; \
 551 const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
 552 { return (OPENSSL_ia32cap_P[1]&AESNI_CAPABLE)? \
 553   &aesni_##keylen##_##mode:&aes_##keylen##_##mode; }
 554
 555 #else
 556
 557 #define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
 558 static const EVP_CIPHER aes_##keylen##_##mode = { \
 559         nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
 560         flags|EVP_CIPH_##MODE##_MODE,   \
 561         aes_init_key,                   \
 562         aes_##mode##_cipher,            \
 563         NULL,                           \
 564         sizeof(EVP_AES_KEY),            \
 565         NULL,NULL,NULL,NULL }; \
 566 const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
 567 { return &aes_##keylen##_##mode; }
 568
 569 #define BLOCK_CIPHER_custom(nid,keylen,blocksize,ivlen,mode,MODE,flags) \
 570 static const EVP_CIPHER aes_##keylen##_##mode = { \
 571         nid##_##keylen##_##mode,blocksize, \
 572         (EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
 573         flags|EVP_CIPH_##MODE##_MODE,   \
 574         aes_##mode##_init_key,          \
 575         aes_##mode##_cipher,            \
 576         aes_##mode##_cleanup,           \
 577         sizeof(EVP_AES_##MODE##_CTX),   \
 578         NULL,NULL,aes_##mode##_ctrl,NULL }; \
 579 const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
 580 { return &aes_##keylen##_##mode; }
 581 #endif
 582
 583 #define BLOCK_CIPHER_generic_pack(nid,keylen,flags)             \
 584         BLOCK_CIPHER_generic(nid,keylen,16,16,cbc,cbc,CBC,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)     \
 585         BLOCK_CIPHER_generic(nid,keylen,16,0,ecb,ecb,ECB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)      \
 586         BLOCK_CIPHER_generic(nid,keylen,1,16,ofb128,ofb,OFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)   \
 587         BLOCK_CIPHER_generic(nid,keylen,1,16,cfb128,cfb,CFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)   \
 588         BLOCK_CIPHER_generic(nid,keylen,1,16,cfb1,cfb1,CFB,flags)       \
 589         BLOCK_CIPHER_generic(nid,keylen,1,16,cfb8,cfb8,CFB,flags)       \
 590         BLOCK_CIPHER_generic(nid,keylen,1,16,ctr,ctr,CTR,flags)
 591
 592 static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 593                    const unsigned char *iv, int enc)
 594         {
 595         int ret;
 596
 597         if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
 598             || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
 599             && !enc)
 600                 ret = AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 601         else
 602                 ret = AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
 603
 604         if(ret < 0)
 605                 {
 606                 EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
 607                 return 0;
 608                 }
 609
 610         return 1;
 611         }
 612
 613 static int aes_cbc_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 614         const unsigned char *in, size_t len)
 615 {
 616         AES_cbc_encrypt(in,out,len,ctx->cipher_data,ctx->iv,ctx->encrypt);
 617
 618         return 1;
 619 }
 620
 621 static int aes_ecb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 622         const unsigned char *in, size_t len)
 623 {
 624         size_t  bl = ctx->cipher->block_size;
 625         size_t  i;
 626
 627         if (len<bl)     return 1;
 628
 629         if (ctx->encrypt) {
 630                 for (i=0,len-=bl;i<=len;i+=bl)
 631                         AES_encrypt(in+i,out+i,ctx->cipher_data);
 632         } else {
 633                 for (i=0,len-=bl;i<=len;i+=bl)
 634                         AES_decrypt(in+i,out+i,ctx->cipher_data);
 635         }
 636
 637         return 1;
 638 }
 639
 640 static int aes_ofb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 641         const unsigned char *in,size_t len)
 642 {
 643         CRYPTO_ofb128_encrypt(in,out,len,ctx->cipher_data,
 644                         ctx->iv,&ctx->num,
 645                         (block128_f)AES_encrypt);
 646         return 1;
 647 }
 648
 649 static int aes_cfb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 650         const unsigned char *in,size_t len)
 651 {
 652         CRYPTO_cfb128_encrypt(in,out,len,ctx->cipher_data,
 653                         ctx->iv,&ctx->num,ctx->encrypt,
 654                         (block128_f)AES_encrypt);
 655         return 1;
 656 }
 657
 658 static int aes_cfb8_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 659         const unsigned char *in,size_t len)
 660 {
 661         CRYPTO_cfb128_8_encrypt(in,out,len,ctx->cipher_data,
 662                         ctx->iv,&ctx->num,ctx->encrypt,
 663                         (block128_f)AES_encrypt);
 664         return 1;
 665 }
 666
 667 static int aes_cfb1_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
 668         const unsigned char *in,size_t len)
 669 {
 670         if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
 671                 CRYPTO_cfb128_1_encrypt(in,out,len,ctx->cipher_data,
 672                         ctx->iv,&ctx->num,ctx->encrypt,
 673                         (block128_f)AES_encrypt);
 674                 return 1;
 675         }
 676
 677         while (len>=MAXBITCHUNK) {
 678                 CRYPTO_cfb128_1_encrypt(in,out,MAXBITCHUNK*8,ctx->cipher_data,
 679                         ctx->iv,&ctx->num,ctx->encrypt,
 680                         (block128_f)AES_encrypt);
 681                 len-=MAXBITCHUNK;
 682         }
 683         if (len)
 684                 CRYPTO_cfb128_1_encrypt(in,out,len*8,ctx->cipher_data,
 685                         ctx->iv,&ctx->num,ctx->encrypt,
 686                         (block128_f)AES_encrypt);
 687
 688         return 1;
 689 }
 690
 691 static int aes_ctr_cipher (EVP_CIPHER_CTX *ctx, unsigned char *out,
 692                 const unsigned char *in, size_t len)
 693 {
 694         unsigned int num;
 695         num = ctx->num;
 696 #ifdef AES_CTR_ASM
 697         void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
 698                         size_t blocks, const AES_KEY *key,
 699                         const unsigned char ivec[AES_BLOCK_SIZE]);
 700
 701         CRYPTO_ctr128_encrypt_ctr32(in,out,len,
 702                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
 703                 ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
 704 #else
 705         CRYPTO_ctr128_encrypt(in,out,len,
 706                 &((EVP_AES_KEY *)ctx->cipher_data)->ks,
 707                 ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
 708 #endif
 709         ctx->num = (size_t)num;
 710         return 1;
 711 }
 712
 713 BLOCK_CIPHER_generic_pack(NID_aes,128,EVP_CIPH_FLAG_FIPS)
 714 BLOCK_CIPHER_generic_pack(NID_aes,192,EVP_CIPH_FLAG_FIPS)
 715 BLOCK_CIPHER_generic_pack(NID_aes,256,EVP_CIPH_FLAG_FIPS)
 716
 717 static int aes_gcm_cleanup(EVP_CIPHER_CTX *c)
 718         {
 719         EVP_AES_GCM_CTX *gctx = c->cipher_data;
 720         OPENSSL_cleanse(&gctx->gcm, sizeof(gctx->gcm));
 721         if (gctx->iv != c->iv)
 722                 OPENSSL_free(gctx->iv);
 723         return 1;
 724         }
 725
 726 /* increment counter (64-bit int) by 1 */
 727 static void ctr64_inc(unsigned char *counter) {
 728         int n=8;
 729         unsigned char  c;
 730
 731         do {
 732                 --n;
 733                 c = counter[n];
 734                 ++c;
 735                 counter[n] = c;
 736                 if (c) return;
 737         } while (n);
 738 }
 739
 740 static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 741         {
 742         EVP_AES_GCM_CTX *gctx = c->cipher_data;
 743         switch (type)
 744                 {
 745         case EVP_CTRL_INIT:
 746                 gctx->key_set = 0;
 747                 gctx->iv_set = 0;
 748                 gctx->ivlen = c->cipher->iv_len;
 749                 gctx->iv = c->iv;
 750                 gctx->taglen = -1;
 751                 gctx->iv_gen = 0;
 752                 gctx->tls_aad_len = -1;
 753                 return 1;
 754
 755         case EVP_CTRL_GCM_SET_IVLEN:
 756                 if (arg <= 0)
 757                         return 0;
 758 #ifdef OPENSSL_FIPS
 759                 if (FIPS_module_mode() && !(c->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)
 760                                                  && arg < 12)
 761                         return 0;
 762 #endif
 763                 /* Allocate memory for IV if needed */
 764                 if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen))
 765                         {
 766                         if (gctx->iv != c->iv)
 767                                 OPENSSL_free(gctx->iv);
 768                         gctx->iv = OPENSSL_malloc(arg);
 769                         if (!gctx->iv)
 770                                 return 0;
 771                         }
 772                 gctx->ivlen = arg;
 773                 return 1;
 774
 775         case EVP_CTRL_GCM_SET_TAG:
 776                 if (arg <= 0 || arg > 16 || c->encrypt)
 777                         return 0;
 778                 memcpy(c->buf, ptr, arg);
 779                 gctx->taglen = arg;
 780                 return 1;
 781
 782         case EVP_CTRL_GCM_GET_TAG:
 783                 if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
 784                         return 0;
 785                 memcpy(ptr, c->buf, arg);
 786                 return 1;
 787
 788         case EVP_CTRL_GCM_SET_IV_FIXED:
 789                 /* Special case: -1 length restores whole IV */
 790                 if (arg == -1)
 791                         {
 792                         memcpy(gctx->iv, ptr, gctx->ivlen);
 793                         gctx->iv_gen = 1;
 794                         return 1;
 795                         }
 796                 /* Fixed field must be at least 4 bytes and invocation field
 797                  * at least 8.
 798                  */
 799                 if ((arg < 4) || (gctx->ivlen - arg) < 8)
 800                         return 0;
 801                 if (arg)
 802                         memcpy(gctx->iv, ptr, arg);
 803                 if (c->encrypt &&
 804                         RAND_bytes(gctx->iv + arg, gctx->ivlen - arg) <= 0)
 805                         return 0;
 806                 gctx->iv_gen = 1;
 807                 return 1;
 808
 809         case EVP_CTRL_GCM_IV_GEN:
 810                 if (gctx->iv_gen == 0 || gctx->key_set == 0)
 811                         return 0;
 812                 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
 813                 if (arg <= 0 || arg > gctx->ivlen)
 814                         arg = gctx->ivlen;
 815                 memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
 816                 /* Invocation field will be at least 8 bytes in size and
 817                  * so no need to check wrap around or increment more than
 818                  * last 8 bytes.
 819                  */
 820                 ctr64_inc(gctx->iv + gctx->ivlen - 8);
 821                 gctx->iv_set = 1;
 822                 return 1;
 823
 824         case EVP_CTRL_GCM_SET_IV_INV:
 825                 if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt)
 826                         return 0;
 827                 memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
 828                 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
 829                 gctx->iv_set = 1;
 830                 return 1;
 831
 832         case EVP_CTRL_AEAD_TLS1_AAD:
 833                 /* Save the AAD for later use */
 834                 if (arg != 13)
 835                         return 0;
 836                 memcpy(c->buf, ptr, arg);
 837                 gctx->tls_aad_len = arg;
 838                         {
 839                         unsigned int len=c->buf[arg-2]<<8|c->buf[arg-1];
 840                         /* Correct length for explicit IV */
 841                         len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;
 842                         /* If decrypting correct for tag too */
 843                         if (!c->encrypt)
 844                                 len -= EVP_GCM_TLS_TAG_LEN;
 845                         c->buf[arg-2] = len>>8;
 846                         c->buf[arg-1] = len & 0xff;
 847                         }
 848                 /* Extra padding: tag appended to record */
 849                 return EVP_GCM_TLS_TAG_LEN;
 850
 851         default:
 852                 return -1;
 853
 854                 }
 855         }
 856
 857 static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 858                         const unsigned char *iv, int enc)
 859         {
 860         EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
 861         if (!iv && !key)
 862                 return 1;
 863         if (key)
 864                 {
 865                 AES_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
 866                 CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, (block128_f)AES_encrypt);
 867                 /* If we have an iv can set it directly, otherwise use
 868                  * saved IV.
 869                  */
 870                 if (iv == NULL && gctx->iv_set)
 871                         iv = gctx->iv;
 872                 if (iv)
 873                         {
 874                         CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
 875                         gctx->iv_set = 1;
 876                         }
 877                 gctx->key_set = 1;
 878                 }
 879         else
 880                 {
 881                 /* If key set use IV, otherwise copy */
 882                 if (gctx->key_set)
 883                         CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
 884                 else
 885                         memcpy(gctx->iv, iv, gctx->ivlen);
 886                 gctx->iv_set = 1;
 887                 gctx->iv_gen = 0;
 888                 }
 889         return 1;
 890         }
 891
 892 /* Handle TLS GCM packet format. This consists of the last portion of the IV
 893  * followed by the payload and finally the tag. On encrypt generate IV,
 894  * encrypt payload and write the tag. On verify retrieve IV, decrypt payload
 895  * and verify tag.
 896  */
 897
 898 static int aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 899                 const unsigned char *in, size_t len)
 900         {
 901         EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
 902         int rv = -1;
 903         /* Encrypt/decrypt must be performed in place */
 904         if (out != in)
 905                 return -1;
 906         /* Set IV from start of buffer or generate IV and write to start
 907          * of buffer.
 908          */
 909         if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ?
 910                                 EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV,
 911                                 EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
 912                 goto err;
 913         /* Use saved AAD */
 914         if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len))
 915                 goto err;
 916         /* Fix buffer and length to point to payload */
 917         in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
 918         out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
 919         len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
 920         if (ctx->encrypt)
 921                 {
 922                 /* Encrypt payload */
 923                 if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
 924                         goto err;
 925                 out += len;
 926                 /* Finally write tag */
 927                 CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN);
 928                 rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
 929                 }
 930         else
 931                 {
 932                 /* Decrypt */
 933                 if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
 934                         goto err;
 935                 /* Retrieve tag */
 936                 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf,
 937                                         EVP_GCM_TLS_TAG_LEN);
 938                 /* If tag mismatch wipe buffer */
 939                 if (memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN))
 940                         {
 941                         OPENSSL_cleanse(out, len);
 942                         goto err;
 943                         }
 944                 rv = len;
 945                 }
 946
 947         err:
 948         gctx->iv_set = 0;
 949         gctx->tls_aad_len = -1;
 950         return rv;
 951         }
 952
 953 static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 954                 const unsigned char *in, size_t len)
 955         {
 956         EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
 957         /* If not set up, return error */
 958         if (!gctx->key_set)
 959                 return -1;
 960
 961         if (gctx->tls_aad_len >= 0)
 962                 return aes_gcm_tls_cipher(ctx, out, in, len);
 963
 964         if (!gctx->iv_set)
 965                 return -1;
 966         if (!ctx->encrypt && gctx->taglen < 0)
 967                 return -1;
 968         if (in)
 969                 {
 970                 if (out == NULL)
 971                         {
 972                         if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
 973                                 return -1;
 974                         }
 975                 else if (ctx->encrypt)
 976                         {
 977                         if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
 978                                 return -1;
 979                         }
 980                 else
 981                         {
 982                         if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
 983                                 return -1;
 984                         }
 985                 return len;
 986                 }
 987         else
 988                 {
 989                 if (!ctx->encrypt)
 990                         {
 991                         if (CRYPTO_gcm128_finish(&gctx->gcm,
 992                                         ctx->buf, gctx->taglen) != 0)
 993                                 return -1;
 994                         gctx->iv_set = 0;
 995                         return 0;
 996                         }
 997                 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
 998                 gctx->taglen = 16;
 999                 /* Don't reuse the IV */
1000                 gctx->iv_set = 0;
1001                 return 0;
1002                 }
1003
1004         }
1005
1006 #define CUSTOM_FLAGS    (EVP_CIPH_FLAG_DEFAULT_ASN1 \
1007                 | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
1008                 | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT)
1009
1010 BLOCK_CIPHER_custom(NID_aes,128,1,12,gcm,GCM,
1011                 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
1012 BLOCK_CIPHER_custom(NID_aes,192,1,12,gcm,GCM,
1013                 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
1014 BLOCK_CIPHER_custom(NID_aes,256,1,12,gcm,GCM,
1015                 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
1016
1017 static int aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
1018         {
1019         EVP_AES_XTS_CTX *xctx = c->cipher_data;
1020         if (type != EVP_CTRL_INIT)
1021                 return -1;
1022         /* key1 and key2 are used as an indicator both key and IV are set */
1023         xctx->xts.key1 = NULL;
1024         xctx->xts.key2 = NULL;
1025         return 1;
1026         }
1027
1028 static int aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
1029                         const unsigned char *iv, int enc)
1030         {
1031         EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
1032         if (!iv && !key)
1033                 return 1;
1034
1035         if (key)
1036                 {
1037                 /* key_len is two AES keys */
1038                 if (enc)
1039                         {
1040                         AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
1041                         xctx->xts.block1 = (block128_f)AES_encrypt;
1042                         }
1043                 else
1044                         {
1045                         AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
1046                         xctx->xts.block1 = (block128_f)AES_decrypt;
1047                         }
1048
1049                 AES_set_encrypt_key(key + ctx->key_len/2,
1050                                                 ctx->key_len * 4, &xctx->ks2);
1051                 xctx->xts.block2 = (block128_f)AES_encrypt;
1052
1053                 xctx->xts.key1 = &xctx->ks1;
1054                 }
1055
1056         if (iv)
1057                 {
1058                 xctx->xts.key2 = &xctx->ks2;
1059                 memcpy(ctx->iv, iv, 16);
1060                 }
1061
1062         return 1;
1063         }
1064
1065 static int aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
1066                 const unsigned char *in, size_t len)
1067         {
1068         EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
1069         if (!xctx->xts.key1 || !xctx->xts.key2)
1070                 return -1;
1071         if (!out || !in)
1072                 return -1;
1073 #ifdef OPENSSL_FIPS
1074         /* Requirement of SP800-38E */
1075         if (FIPS_module_mode() && !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW) &&
1076                         (len > (1L<<20)*16))
1077                 {
1078                 EVPerr(EVP_F_AES_XTS, EVP_R_TOO_LARGE);
1079                 return -1;
1080                 }
1081 #endif
1082         if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len,
1083                                                                 ctx->encrypt))
1084                 return -1;
1085         return len;
1086         }
1087
1088 #define aes_xts_cleanup NULL
1089
1090 BLOCK_CIPHER_custom(NID_aes,128,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
1091 BLOCK_CIPHER_custom(NID_aes,256,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
1092
1093 static int aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
1094         {
1095         EVP_AES_CCM_CTX *cctx = c->cipher_data;
1096         switch (type)
1097                 {
1098         case EVP_CTRL_INIT:
1099                 cctx->key_set = 0;
1100                 cctx->iv_set = 0;
1101                 cctx->L = 8;
1102                 cctx->M = 12;
1103                 cctx->tag_set = 0;
1104                 cctx->len_set = 0;
1105                 return 1;
1106
1107         case EVP_CTRL_CCM_SET_IVLEN:
1108                 arg = 15 - arg;
1109         case EVP_CTRL_CCM_SET_L:
1110                 if (arg < 2 || arg > 8)
1111                         return 0;
1112                 cctx->L = arg;
1113                 return 1;
1114
1115         case EVP_CTRL_CCM_SET_TAG:
1116                 if ((arg & 1) || arg < 4 || arg > 16)
1117                         return 0;
1118                 if ((c->encrypt && ptr) || (!c->encrypt && !ptr))
1119                         return 0;
1120                 if (ptr)
1121                         {
1122                         cctx->tag_set = 1;
1123                         memcpy(c->buf, ptr, arg);
1124                         }
1125                 cctx->M = arg;
1126                 return 1;
1127
1128         case EVP_CTRL_CCM_GET_TAG:
1129                 if (!c->encrypt || !cctx->tag_set)
1130                         return 0;
1131                 if(!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg))
1132                         return 0;
1133                 cctx->tag_set = 0;
1134                 cctx->iv_set = 0;
1135                 cctx->len_set = 0;
1136                 return 1;
1137
1138         default:
1139                 return -1;
1140
1141                 }
1142         }
1143
1144 static int aes_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
1145                         const unsigned char *iv, int enc)
1146         {
1147         EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
1148         if (!iv && !key)
1149                 return 1;
1150         if (key)
1151                 {
1152                 AES_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
1153                 CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
1154                                         &cctx->ks, (block128_f)AES_encrypt);
1155                 cctx->key_set = 1;
1156                 }
1157         if (iv)
1158                 {
1159                 memcpy(ctx->iv, iv, 15 - cctx->L);
1160                 cctx->iv_set = 1;
1161                 }
1162         return 1;
1163         }
1164
1165 static int aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
1166                 const unsigned char *in, size_t len)
1167         {
1168         EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
1169         CCM128_CONTEXT *ccm = &cctx->ccm;
1170         /* If not set up, return error */
1171         if (!cctx->iv_set && !cctx->key_set)
1172                 return -1;
1173         if (!ctx->encrypt && !cctx->tag_set)
1174                 return -1;
1175         if (!out)
1176                 {
1177                 if (!in)
1178                         {
1179                         if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,len))
1180                                 return -1;
1181                         cctx->len_set = 1;
1182                         return len;
1183                         }
1184                 /* If have AAD need message length */
1185                 if (!cctx->len_set && len)
1186                         return -1;
1187                 CRYPTO_ccm128_aad(ccm, in, len);
1188                 return len;
1189                 }
1190         /* EVP_*Final() doesn't return any data */
1191         if (!in)
1192                 return 0;
1193         /* If not set length yet do it */
1194         if (!cctx->len_set)
1195                 {
1196                 if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
1197                         return -1;
1198                 cctx->len_set = 1;
1199                 }
1200         if (ctx->encrypt)
1201                 {
1202                 if (CRYPTO_ccm128_encrypt(ccm, in, out, len))
1203                         return -1;
1204                 cctx->tag_set = 1;
1205                 return len;
1206                 }
1207         else
1208                 {
1209                 int rv = -1;
1210                 if (!CRYPTO_ccm128_decrypt(ccm, in, out, len))
1211                         {
1212                         unsigned char tag[16];
1213                         if (CRYPTO_ccm128_tag(ccm, tag, cctx->M))
1214                                 {
1215                                 if (!memcmp(tag, ctx->buf, cctx->M))
1216                                         rv = len;
1217                                 }
1218                         }
1219                 if (rv == -1)
1220                         OPENSSL_cleanse(out, len);
1221                 cctx->iv_set = 0;
1222                 cctx->tag_set = 0;
1223                 cctx->len_set = 0;
1224                 return rv;
1225                 }
1226
1227         }
1228
1229 #define aes_ccm_cleanup NULL
1230
1231 BLOCK_CIPHER_custom(NID_aes,128,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
1232 BLOCK_CIPHER_custom(NID_aes,192,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
1233 BLOCK_CIPHER_custom(NID_aes,256,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
1234
1235 #endif