crypto/openssl/crypto/pkcs7/pk7_doit.c

   1 /* crypto/pkcs7/pk7_doit.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65 #include <openssl/err.h>
  66
  67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  68                          void *value);
  69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  70
  71 static int PKCS7_type_is_other(PKCS7* p7)
  72         {
  73         int isOther=1;
  74
  75         int nid=OBJ_obj2nid(p7->type);
  76
  77         switch( nid )
  78                 {
  79         case NID_pkcs7_data:
  80         case NID_pkcs7_signed:
  81         case NID_pkcs7_enveloped:
  82         case NID_pkcs7_signedAndEnveloped:
  83         case NID_pkcs7_digest:
  84         case NID_pkcs7_encrypted:
  85                 isOther=0;
  86                 break;
  87         default:
  88                 isOther=1;
  89                 }
  90
  91         return isOther;
  92
  93         }
  94
  95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  96         {
  97         if ( PKCS7_type_is_data(p7))
  98                 return p7->d.data;
  99         if ( PKCS7_type_is_other(p7) && p7->d.other
 100                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
 101                 return p7->d.other->value.octet_string;
 102         return NULL;
 103         }
 104
 105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 106         {
 107         BIO *btmp;
 108         const EVP_MD *md;
 109         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 110                 {
 111                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 112                 goto err;
 113                 }
 114
 115         md=EVP_get_digestbyobj(alg->algorithm);
 116         if (md == NULL)
 117                 {
 118                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 119                 goto err;
 120                 }
 121
 122         BIO_set_md(btmp,md);
 123         if (*pbio == NULL)
 124                 *pbio=btmp;
 125         else if (!BIO_push(*pbio,btmp))
 126                 {
 127                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 128                 goto err;
 129                 }
 130         btmp=NULL;
 131
 132         return 1;
 133
 134         err:
 135         if (btmp)
 136                 BIO_free(btmp);
 137         return 0;
 138
 139         }
 140
 141 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
 142                                         unsigned char *key, int keylen)
 143         {
 144         EVP_PKEY_CTX *pctx = NULL;
 145         EVP_PKEY *pkey = NULL;
 146         unsigned char *ek = NULL;
 147         int ret = 0;
 148         size_t eklen;
 149
 150         pkey = X509_get_pubkey(ri->cert);
 151
 152         if (!pkey)
 153                 return 0;
 154
 155         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 156         if (!pctx)
 157                 return 0;
 158
 159         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 160                 goto err;
 161
 162         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 163                                 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
 164                 {
 165                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
 166                 goto err;
 167                 }
 168
 169         if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
 170                 goto err;
 171
 172         ek = OPENSSL_malloc(eklen);
 173
 174         if (ek == NULL)
 175                 {
 176                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
 177                 goto err;
 178                 }
 179
 180         if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
 181                 goto err;
 182
 183         ASN1_STRING_set0(ri->enc_key, ek, eklen);
 184         ek = NULL;
 185
 186         ret = 1;
 187
 188         err:
 189         if (pkey)
 190                 EVP_PKEY_free(pkey);
 191         if (pctx)
 192                 EVP_PKEY_CTX_free(pctx);
 193         if (ek)
 194                 OPENSSL_free(ek);
 195         return ret;
 196
 197         }
 198
 199
 200 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
 201                                PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
 202         {
 203         EVP_PKEY_CTX *pctx = NULL;
 204         unsigned char *ek = NULL;
 205         size_t eklen;
 206
 207         int ret = -1;
 208
 209         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 210         if (!pctx)
 211                 return -1;
 212
 213         if (EVP_PKEY_decrypt_init(pctx) <= 0)
 214                 goto err;
 215
 216         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
 217                                 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
 218                 {
 219                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
 220                 goto err;
 221                 }
 222
 223         if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
 224                                 ri->enc_key->data, ri->enc_key->length) <= 0)
 225                 goto err;
 226
 227         ek = OPENSSL_malloc(eklen);
 228
 229         if (ek == NULL)
 230                 {
 231                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
 232                 goto err;
 233                 }
 234
 235         if (EVP_PKEY_decrypt(pctx, ek, &eklen,
 236                                 ri->enc_key->data, ri->enc_key->length) <= 0)
 237                 {
 238                 ret = 0;
 239                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
 240                 goto err;
 241                 }
 242
 243         ret = 1;
 244
 245         if (*pek)
 246                 {
 247                 OPENSSL_cleanse(*pek, *peklen);
 248                 OPENSSL_free(*pek);
 249                 }
 250
 251         *pek = ek;
 252         *peklen = eklen;
 253
 254         err:
 255         if (pctx)
 256                 EVP_PKEY_CTX_free(pctx);
 257         if (!ret && ek)
 258                 OPENSSL_free(ek);
 259
 260         return ret;
 261         }
 262
 263 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 264         {
 265         int i;
 266         BIO *out=NULL,*btmp=NULL;
 267         X509_ALGOR *xa = NULL;
 268         const EVP_CIPHER *evp_cipher=NULL;
 269         STACK_OF(X509_ALGOR) *md_sk=NULL;
 270         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 271         X509_ALGOR *xalg=NULL;
 272         PKCS7_RECIP_INFO *ri=NULL;
 273         ASN1_OCTET_STRING *os=NULL;
 274
 275         if (p7 == NULL) {
 276                 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
 277                 return NULL;
 278         }
 279         /*
 280          * The content field in the PKCS7 ContentInfo is optional, but that really
 281          * only applies to inner content (precisely, detached signatures).
 282          *
 283          * When reading content, missing outer content is therefore treated as an
 284          * error.
 285          *
 286          * When creating content, PKCS7_content_new() must be called before
 287          * calling this method, so a NULL p7->d is always an error.
 288          */
 289         if (p7->d.ptr == NULL) {
 290                 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
 291                 return NULL;
 292         }
 293
 294         i=OBJ_obj2nid(p7->type);
 295         p7->state=PKCS7_S_HEADER;
 296
 297         switch (i)
 298                 {
 299         case NID_pkcs7_signed:
 300                 md_sk=p7->d.sign->md_algs;
 301                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 302                 break;
 303         case NID_pkcs7_signedAndEnveloped:
 304                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 305                 md_sk=p7->d.signed_and_enveloped->md_algs;
 306                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 307                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 308                 if (evp_cipher == NULL)
 309                         {
 310                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 311                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 312                         goto err;
 313                         }
 314                 break;
 315         case NID_pkcs7_enveloped:
 316                 rsk=p7->d.enveloped->recipientinfo;
 317                 xalg=p7->d.enveloped->enc_data->algorithm;
 318                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 319                 if (evp_cipher == NULL)
 320                         {
 321                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 322                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 323                         goto err;
 324                         }
 325                 break;
 326         case NID_pkcs7_digest:
 327                 xa = p7->d.digest->md;
 328                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 329                 break;
 330         case NID_pkcs7_data:
 331                 break;
 332         default:
 333                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 334                 goto err;
 335                 }
 336
 337         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 338                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 339                         goto err;
 340
 341         if (xa && !PKCS7_bio_add_digest(&out, xa))
 342                         goto err;
 343
 344         if (evp_cipher != NULL)
 345                 {
 346                 unsigned char key[EVP_MAX_KEY_LENGTH];
 347                 unsigned char iv[EVP_MAX_IV_LENGTH];
 348                 int keylen,ivlen;
 349                 EVP_CIPHER_CTX *ctx;
 350
 351                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 352                         {
 353                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 354                         goto err;
 355                         }
 356                 BIO_get_cipher_ctx(btmp, &ctx);
 357                 keylen=EVP_CIPHER_key_length(evp_cipher);
 358                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 359                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 360                 if (ivlen > 0)
 361                         if (RAND_pseudo_bytes(iv,ivlen) <= 0)
 362                                 goto err;
 363                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 364                         goto err;
 365                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 366                         goto err;
 367                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 368                         goto err;
 369
 370                 if (ivlen > 0) {
 371                         if (xalg->parameter == NULL) {
 372                                 xalg->parameter = ASN1_TYPE_new();
 373                                 if (xalg->parameter == NULL)
 374                                         goto err;
 375                         }
 376                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 377                                 goto err;
 378                 }
 379
 380                 /* Lets do the pub key stuff :-) */
 381                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 382                         {
 383                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 384                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
 385                                 goto err;
 386                         }
 387                 OPENSSL_cleanse(key, keylen);
 388
 389                 if (out == NULL)
 390                         out=btmp;
 391                 else
 392                         BIO_push(out,btmp);
 393                 btmp=NULL;
 394                 }
 395
 396         if (bio == NULL)
 397                 {
 398                 if (PKCS7_is_detached(p7))
 399                         bio=BIO_new(BIO_s_null());
 400                 else if (os && os->length > 0)
 401                         bio = BIO_new_mem_buf(os->data, os->length);
 402                 if(bio == NULL)
 403                         {
 404                         bio=BIO_new(BIO_s_mem());
 405                         if (bio == NULL)
 406                                 goto err;
 407                         BIO_set_mem_eof_return(bio,0);
 408                         }
 409                 }
 410         if (out)
 411                 BIO_push(out,bio);
 412         else
 413                 out = bio;
 414         bio=NULL;
 415         if (0)
 416                 {
 417 err:
 418                 if (out != NULL)
 419                         BIO_free_all(out);
 420                 if (btmp != NULL)
 421                         BIO_free_all(btmp);
 422                 out=NULL;
 423                 }
 424         return(out);
 425         }
 426
 427 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 428         {
 429         int ret;
 430         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 431                                 pcert->cert_info->issuer);
 432         if (ret)
 433                 return ret;
 434         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 435                                         ri->issuer_and_serial->serial);
 436         }
 437
 438 /* int */
 439 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 440         {
 441         int i,j;
 442         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 443         X509_ALGOR *xa;
 444         ASN1_OCTET_STRING *data_body=NULL;
 445         const EVP_MD *evp_md;
 446         const EVP_CIPHER *evp_cipher=NULL;
 447         EVP_CIPHER_CTX *evp_ctx=NULL;
 448         X509_ALGOR *enc_alg=NULL;
 449         STACK_OF(X509_ALGOR) *md_sk=NULL;
 450         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 451         PKCS7_RECIP_INFO *ri=NULL;
 452        unsigned char *ek = NULL, *tkey = NULL;
 453        int eklen = 0, tkeylen = 0;
 454
 455         if (p7 == NULL) {
 456                 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
 457                 return NULL;
 458         }
 459
 460         if (p7->d.ptr == NULL) {
 461                 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
 462                 return NULL;
 463         }
 464
 465         i=OBJ_obj2nid(p7->type);
 466         p7->state=PKCS7_S_HEADER;
 467
 468         switch (i)
 469                 {
 470         case NID_pkcs7_signed:
 471                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 472                 if (!PKCS7_is_detached(p7) && data_body == NULL)
 473                         {
 474                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_INVALID_SIGNED_DATA_TYPE);
 475                         goto err;
 476                         }
 477                 md_sk=p7->d.sign->md_algs;
 478                 break;
 479         case NID_pkcs7_signedAndEnveloped:
 480                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 481                 md_sk=p7->d.signed_and_enveloped->md_algs;
 482                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 483                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 484                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 485                 if (evp_cipher == NULL)
 486                         {
 487                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 488                         goto err;
 489                         }
 490                 break;
 491         case NID_pkcs7_enveloped:
 492                 rsk=p7->d.enveloped->recipientinfo;
 493                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 494                 data_body=p7->d.enveloped->enc_data->enc_data;
 495                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 496                 if (evp_cipher == NULL)
 497                         {
 498                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 499                         goto err;
 500                         }
 501                 break;
 502         default:
 503                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 504                 goto err;
 505                 }
 506
 507         /* We will be checking the signature */
 508         if (md_sk != NULL)
 509                 {
 510                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 511                         {
 512                         xa=sk_X509_ALGOR_value(md_sk,i);
 513                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 514                                 {
 515                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 516                                 goto err;
 517                                 }
 518
 519                         j=OBJ_obj2nid(xa->algorithm);
 520                         evp_md=EVP_get_digestbynid(j);
 521                         if (evp_md == NULL)
 522                                 {
 523                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 524                                 goto err;
 525                                 }
 526
 527                         BIO_set_md(btmp,evp_md);
 528                         if (out == NULL)
 529                                 out=btmp;
 530                         else
 531                                 BIO_push(out,btmp);
 532                         btmp=NULL;
 533                         }
 534                 }
 535
 536         if (evp_cipher != NULL)
 537                 {
 538 #if 0
 539                 unsigned char key[EVP_MAX_KEY_LENGTH];
 540                 unsigned char iv[EVP_MAX_IV_LENGTH];
 541                 unsigned char *p;
 542                 int keylen,ivlen;
 543                 int max;
 544                 X509_OBJECT ret;
 545 #endif
 546
 547                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 548                         {
 549                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 550                         goto err;
 551                         }
 552
 553                 /* It was encrypted, we need to decrypt the secret key
 554                  * with the private key */
 555
 556                 /* Find the recipientInfo which matches the passed certificate
 557                  * (if any)
 558                  */
 559
 560                 if (pcert)
 561                         {
 562                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 563                                 {
 564                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 565                                 if (!pkcs7_cmp_ri(ri, pcert))
 566                                         break;
 567                                 ri=NULL;
 568                                 }
 569                         if (ri == NULL)
 570                                 {
 571                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 572                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 573                                 goto err;
 574                                 }
 575                         }
 576
 577                 /* If we haven't got a certificate try each ri in turn */
 578                 if (pcert == NULL)
 579                         {
 580                         /* Always attempt to decrypt all rinfo even
 581                          * after sucess as a defence against MMA timing
 582                          * attacks.
 583                          */
 584                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 585                                 {
 586                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 587
 588                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
 589                                                         ri, pkey) < 0)
 590                                         goto err;
 591                                 ERR_clear_error();
 592                                 }
 593                         }
 594                 else
 595                         {
 596                         /* Only exit on fatal errors, not decrypt failure */
 597                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
 598                                 goto err;
 599                         ERR_clear_error();
 600                         }
 601
 602                 evp_ctx=NULL;
 603                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 604                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 605                         goto err;
 606                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 607                         goto err;
 608                 /* Generate random key as MMA defence */
 609                 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
 610                 tkey = OPENSSL_malloc(tkeylen);
 611                 if (!tkey)
 612                         goto err;
 613                 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
 614                         goto err;
 615                 if (ek == NULL)
 616                         {
 617                         ek = tkey;
 618                         eklen = tkeylen;
 619                         tkey = NULL;
 620                         }
 621
 622                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 623                         /* Some S/MIME clients don't use the same key
 624                          * and effective key length. The key length is
 625                          * determined by the size of the decrypted RSA key.
 626                          */
 627                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
 628                                 {
 629                                 /* Use random key as MMA defence */
 630                                 OPENSSL_cleanse(ek, eklen);
 631                                 OPENSSL_free(ek);
 632                                 ek = tkey;
 633                                 eklen = tkeylen;
 634                                 tkey = NULL;
 635                                 }
 636                 }
 637                 /* Clear errors so we don't leak information useful in MMA */
 638                 ERR_clear_error();
 639                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
 640                         goto err;
 641
 642                 if (ek)
 643                         {
 644                         OPENSSL_cleanse(ek,eklen);
 645                         OPENSSL_free(ek);
 646                        ek = NULL;
 647                         }
 648                 if (tkey)
 649                         {
 650                         OPENSSL_cleanse(tkey,tkeylen);
 651                         OPENSSL_free(tkey);
 652                        tkey = NULL;
 653                         }
 654
 655                 if (out == NULL)
 656                         out=etmp;
 657                 else
 658                         BIO_push(out,etmp);
 659                 etmp=NULL;
 660                 }
 661
 662 #if 1
 663         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 664                 {
 665                 bio=in_bio;
 666                 }
 667         else
 668                 {
 669 #if 0
 670                 bio=BIO_new(BIO_s_mem());
 671                 /* We need to set this so that when we have read all
 672                  * the data, the encrypt BIO, if present, will read
 673                  * EOF and encode the last few bytes */
 674                 BIO_set_mem_eof_return(bio,0);
 675
 676                 if (data_body->length > 0)
 677                         BIO_write(bio,(char *)data_body->data,data_body->length);
 678 #else
 679                 if (data_body->length > 0)
 680                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 681                 else {
 682                         bio=BIO_new(BIO_s_mem());
 683                         BIO_set_mem_eof_return(bio,0);
 684                 }
 685                 if (bio == NULL)
 686                         goto err;
 687 #endif
 688                 }
 689         BIO_push(out,bio);
 690         bio=NULL;
 691 #endif
 692         if (0)
 693                 {
 694 err:
 695                if (ek)
 696                        {
 697                        OPENSSL_cleanse(ek,eklen);
 698                        OPENSSL_free(ek);
 699                        }
 700                if (tkey)
 701                        {
 702                        OPENSSL_cleanse(tkey,tkeylen);
 703                        OPENSSL_free(tkey);
 704                        }
 705                 if (out != NULL) BIO_free_all(out);
 706                 if (btmp != NULL) BIO_free_all(btmp);
 707                 if (etmp != NULL) BIO_free_all(etmp);
 708                 if (bio != NULL) BIO_free_all(bio);
 709                 out=NULL;
 710                 }
 711         return(out);
 712         }
 713
 714 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 715         {
 716         for (;;)
 717                 {
 718                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 719                 if (bio == NULL)
 720                         {
 721                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 722                         return NULL;
 723                         }
 724                 BIO_get_md_ctx(bio,pmd);
 725                 if (*pmd == NULL)
 726                         {
 727                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 728                         return NULL;
 729                         }
 730                 if (EVP_MD_CTX_type(*pmd) == nid)
 731                         return bio;
 732                 bio=BIO_next(bio);
 733                 }
 734         return NULL;
 735         }
 736
 737 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
 738         {
 739         unsigned char md_data[EVP_MAX_MD_SIZE];
 740         unsigned int md_len;
 741
 742         /* Add signing time if not already present */
 743         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
 744                 {
 745                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
 746                         {
 747                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
 748                                         ERR_R_MALLOC_FAILURE);
 749                         return 0;
 750                         }
 751                 }
 752
 753         /* Add digest */
 754         if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
 755                 {
 756                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
 757                 return 0;
 758                 }
 759         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
 760                 {
 761                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 762                 return 0;
 763                 }
 764
 765         /* Now sign the attributes */
 766         if (!PKCS7_SIGNER_INFO_sign(si))
 767                         return 0;
 768
 769         return 1;
 770         }
 771
 772
 773 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 774         {
 775         int ret=0;
 776         int i,j;
 777         BIO *btmp;
 778         PKCS7_SIGNER_INFO *si;
 779         EVP_MD_CTX *mdc,ctx_tmp;
 780         STACK_OF(X509_ATTRIBUTE) *sk;
 781         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 782         ASN1_OCTET_STRING *os=NULL;
 783
 784         if (p7 == NULL) {
 785                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
 786                 return 0;
 787         }
 788
 789         if (p7->d.ptr == NULL) {
 790                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
 791                 return 0;
 792         }
 793
 794         EVP_MD_CTX_init(&ctx_tmp);
 795         i=OBJ_obj2nid(p7->type);
 796         p7->state=PKCS7_S_HEADER;
 797
 798         switch (i)
 799                 {
 800         case NID_pkcs7_data:
 801                 os = p7->d.data;
 802                 break;
 803         case NID_pkcs7_signedAndEnveloped:
 804                 /* XXXXXXXXXXXXXXXX */
 805                 si_sk=p7->d.signed_and_enveloped->signer_info;
 806                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
 807                 if (!os)
 808                         {
 809                         os=M_ASN1_OCTET_STRING_new();
 810                         if (!os)
 811                                 {
 812                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 813                                 goto err;
 814                                 }
 815                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
 816                         }
 817                 break;
 818         case NID_pkcs7_enveloped:
 819                 /* XXXXXXXXXXXXXXXX */
 820                 os = p7->d.enveloped->enc_data->enc_data;
 821                 if (!os)
 822                         {
 823                         os=M_ASN1_OCTET_STRING_new();
 824                         if (!os)
 825                                 {
 826                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 827                                 goto err;
 828                                 }
 829                         p7->d.enveloped->enc_data->enc_data=os;
 830                         }
 831                 break;
 832         case NID_pkcs7_signed:
 833                 si_sk=p7->d.sign->signer_info;
 834                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 835                 /* If detached data then the content is excluded */
 836                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 837                         M_ASN1_OCTET_STRING_free(os);
 838                         os = NULL;
 839                         p7->d.sign->contents->d.data = NULL;
 840                 }
 841                 break;
 842
 843         case NID_pkcs7_digest:
 844                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 845                 /* If detached data then the content is excluded */
 846                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 847                         {
 848                         M_ASN1_OCTET_STRING_free(os);
 849                         os = NULL;
 850                         p7->d.digest->contents->d.data = NULL;
 851                         }
 852                 break;
 853
 854         default:
 855                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 856                 goto err;
 857                 }
 858
 859         if (si_sk != NULL)
 860                 {
 861                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 862                         {
 863                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 864                         if (si->pkey == NULL)
 865                                 continue;
 866
 867                         j = OBJ_obj2nid(si->digest_alg->algorithm);
 868
 869                         btmp=bio;
 870
 871                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 872
 873                         if (btmp == NULL)
 874                                 goto err;
 875
 876                         /* We now have the EVP_MD_CTX, lets do the
 877                          * signing. */
 878                         if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
 879                                 goto err;
 880
 881                         sk=si->auth_attr;
 882
 883                         /* If there are attributes, we add the digest
 884                          * attribute and only sign the attributes */
 885                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
 886                                 {
 887                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
 888                                         goto err;
 889                                 }
 890                         else
 891                                 {
 892                                 unsigned char *abuf = NULL;
 893                                 unsigned int abuflen;
 894                                 abuflen = EVP_PKEY_size(si->pkey);
 895                                 abuf = OPENSSL_malloc(abuflen);
 896                                 if (!abuf)
 897                                         goto err;
 898
 899                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
 900                                                         si->pkey))
 901                                         {
 902                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 903                                                         ERR_R_EVP_LIB);
 904                                         goto err;
 905                                         }
 906                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
 907                                 }
 908                         }
 909                 }
 910         else if (i == NID_pkcs7_digest) {
 911                 unsigned char md_data[EVP_MAX_MD_SIZE];
 912                 unsigned int md_len;
 913                 if (!PKCS7_find_digest(&mdc, bio,
 914                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 915                         goto err;
 916                 if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
 917                         goto err;
 918                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 919                 }
 920
 921                 if (!PKCS7_is_detached(p7)) {
 922                         /*
 923                          * NOTE(emilia): I think we only reach os == NULL here because detached
 924                          * digested data support is broken.
 925                          */
 926                         if (os == NULL)
 927                                 goto err;
 928                         if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
 929                                 char *cont;
 930                                 long contlen;
 931                                 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
 932                                 if (btmp == NULL) {
 933                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 934                                 goto err;
 935                         }
 936                         contlen = BIO_get_mem_data(btmp, &cont);
 937                         /*
 938                          * Mark the BIO read only then we can use its copy of the data
 939                          * instead of making an extra copy.
 940                          */
 941                         BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 942                         BIO_set_mem_eof_return(btmp, 0);
 943                         ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 944                 }
 945         }
 946         ret=1;
 947 err:
 948         EVP_MD_CTX_cleanup(&ctx_tmp);
 949         return(ret);
 950         }
 951
 952 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
 953         {
 954         EVP_MD_CTX mctx;
 955         EVP_PKEY_CTX *pctx;
 956         unsigned char *abuf = NULL;
 957         int alen;
 958         size_t siglen;
 959         const EVP_MD *md = NULL;
 960
 961         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
 962         if (md == NULL)
 963                 return 0;
 964
 965         EVP_MD_CTX_init(&mctx);
 966         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
 967                 goto err;
 968
 969         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 970                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
 971                 {
 972                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 973                 goto err;
 974                 }
 975
 976         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
 977                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 978         if(!abuf)
 979                 goto err;
 980         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
 981                 goto err;
 982         OPENSSL_free(abuf);
 983         abuf = NULL;
 984         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 985                 goto err;
 986         abuf = OPENSSL_malloc(siglen);
 987         if(!abuf)
 988                 goto err;
 989         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 990                 goto err;
 991
 992         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 993                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
 994                 {
 995                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 996                 goto err;
 997                 }
 998
 999         EVP_MD_CTX_cleanup(&mctx);
1000
1001         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
1002
1003         return 1;
1004
1005         err:
1006         if (abuf)
1007                 OPENSSL_free(abuf);
1008         EVP_MD_CTX_cleanup(&mctx);
1009         return 0;
1010
1011         }
1012
1013 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
1014              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
1015         {
1016         PKCS7_ISSUER_AND_SERIAL *ias;
1017         int ret=0,i;
1018         STACK_OF(X509) *cert;
1019         X509 *x509;
1020
1021         if (p7 == NULL) {
1022                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
1023                 return 0;
1024         }
1025
1026         if (p7->d.ptr == NULL) {
1027                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
1028                 return 0;
1029         }
1030
1031         if (PKCS7_type_is_signed(p7))
1032                 {
1033                 cert=p7->d.sign->cert;
1034                 }
1035         else if (PKCS7_type_is_signedAndEnveloped(p7))
1036                 {
1037                 cert=p7->d.signed_and_enveloped->cert;
1038                 }
1039         else
1040                 {
1041                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
1042                 goto err;
1043                 }
1044         /* XXXXXXXXXXXXXXXXXXXXXXX */
1045         ias=si->issuer_and_serial;
1046
1047         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
1048
1049         /* were we able to find the cert in passed to us */
1050         if (x509 == NULL)
1051                 {
1052                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1053                 goto err;
1054                 }
1055
1056         /* Lets verify */
1057         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
1058                 {
1059                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1060                 goto err;
1061                 }
1062         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1063         i=X509_verify_cert(ctx);
1064         if (i <= 0)
1065                 {
1066                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1067                 X509_STORE_CTX_cleanup(ctx);
1068                 goto err;
1069                 }
1070         X509_STORE_CTX_cleanup(ctx);
1071
1072         return PKCS7_signatureVerify(bio, p7, si, x509);
1073         err:
1074         return ret;
1075         }
1076
1077 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1078                                                                 X509 *x509)
1079         {
1080         ASN1_OCTET_STRING *os;
1081         EVP_MD_CTX mdc_tmp,*mdc;
1082         int ret=0,i;
1083         int md_type;
1084         STACK_OF(X509_ATTRIBUTE) *sk;
1085         BIO *btmp;
1086         EVP_PKEY *pkey;
1087
1088         EVP_MD_CTX_init(&mdc_tmp);
1089
1090         if (!PKCS7_type_is_signed(p7) &&
1091                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
1092                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1093                                                 PKCS7_R_WRONG_PKCS7_TYPE);
1094                 goto err;
1095         }
1096
1097         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
1098
1099         btmp=bio;
1100         for (;;)
1101                 {
1102                 if ((btmp == NULL) ||
1103                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
1104                         {
1105                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1106                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1107                         goto err;
1108                         }
1109                 BIO_get_md_ctx(btmp,&mdc);
1110                 if (mdc == NULL)
1111                         {
1112                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1113                                                         ERR_R_INTERNAL_ERROR);
1114                         goto err;
1115                         }
1116                 if (EVP_MD_CTX_type(mdc) == md_type)
1117                         break;
1118                 /* Workaround for some broken clients that put the signature
1119                  * OID instead of the digest OID in digest_alg->algorithm
1120                  */
1121                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1122                         break;
1123                 btmp=BIO_next(btmp);
1124                 }
1125
1126         /* mdc is the digest ctx that we want, unless there are attributes,
1127          * in which case the digest is the signed attributes */
1128         if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
1129                 goto err;
1130
1131         sk=si->auth_attr;
1132         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1133                 {
1134                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1135                 unsigned int md_len;
1136                 int alen;
1137                 ASN1_OCTET_STRING *message_digest;
1138
1139                 if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
1140                         goto err;
1141                 message_digest=PKCS7_digest_from_attributes(sk);
1142                 if (!message_digest)
1143                         {
1144                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1145                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1146                         goto err;
1147                         }
1148                 if ((message_digest->length != (int)md_len) ||
1149                         (memcmp(message_digest->data,md_dat,md_len)))
1150                         {
1151 #if 0
1152 {
1153 int ii;
1154 for (ii=0; ii<message_digest->length; ii++)
1155         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1156 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1157 }
1158 #endif
1159                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1160                                                         PKCS7_R_DIGEST_FAILURE);
1161                         ret= -1;
1162                         goto err;
1163                         }
1164
1165                 if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
1166                         goto err;
1167
1168                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1169                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1170                 if (alen <= 0)
1171                         {
1172                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1173                         ret = -1;
1174                         goto err;
1175                         }
1176                 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1177                         goto err;
1178
1179                 OPENSSL_free(abuf);
1180                 }
1181
1182         os=si->enc_digest;
1183         pkey = X509_get_pubkey(x509);
1184         if (!pkey)
1185                 {
1186                 ret = -1;
1187                 goto err;
1188                 }
1189
1190         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1191         EVP_PKEY_free(pkey);
1192         if (i <= 0)
1193                 {
1194                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1195                                                 PKCS7_R_SIGNATURE_FAILURE);
1196                 ret= -1;
1197                 goto err;
1198                 }
1199         else
1200                 ret=1;
1201 err:
1202         EVP_MD_CTX_cleanup(&mdc_tmp);
1203         return(ret);
1204         }
1205
1206 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1207         {
1208         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1209         PKCS7_RECIP_INFO *ri;
1210         int i;
1211
1212         i=OBJ_obj2nid(p7->type);
1213         if (i != NID_pkcs7_signedAndEnveloped)
1214                 return NULL;
1215         if (p7->d.signed_and_enveloped == NULL)
1216                 return NULL;
1217         rsk=p7->d.signed_and_enveloped->recipientinfo;
1218         if (rsk == NULL)
1219                 return NULL;
1220         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1221         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1222         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1223         return(ri->issuer_and_serial);
1224         }
1225
1226 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1227         {
1228         return(get_attribute(si->auth_attr,nid));
1229         }
1230
1231 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1232         {
1233         return(get_attribute(si->unauth_attr,nid));
1234         }
1235
1236 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1237         {
1238         int i;
1239         X509_ATTRIBUTE *xa;
1240         ASN1_OBJECT *o;
1241
1242         o=OBJ_nid2obj(nid);
1243         if (!o || !sk) return(NULL);
1244         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1245                 {
1246                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1247                 if (OBJ_cmp(xa->object,o) == 0)
1248                         {
1249                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1250                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1251                         else
1252                                 return(NULL);
1253                         }
1254                 }
1255         return(NULL);
1256         }
1257
1258 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1259 {
1260         ASN1_TYPE *astype;
1261         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1262         return astype->value.octet_string;
1263 }
1264
1265 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1266                                 STACK_OF(X509_ATTRIBUTE) *sk)
1267         {
1268         int i;
1269
1270         if (p7si->auth_attr != NULL)
1271                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1272         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1273         if (p7si->auth_attr == NULL)
1274                 return 0;
1275         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1276                 {
1277                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1278                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1279                     == NULL)
1280                         return(0);
1281                 }
1282         return(1);
1283         }
1284
1285 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1286         {
1287         int i;
1288
1289         if (p7si->unauth_attr != NULL)
1290                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1291                                            X509_ATTRIBUTE_free);
1292         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1293         if (p7si->unauth_attr == NULL)
1294                 return 0;
1295         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1296                 {
1297                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1298                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1299                     == NULL)
1300                         return(0);
1301                 }
1302         return(1);
1303         }
1304
1305 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1306              void *value)
1307         {
1308         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1309         }
1310
1311 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1312              void *value)
1313         {
1314         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1315         }
1316
1317 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1318                          void *value)
1319         {
1320         X509_ATTRIBUTE *attr=NULL;
1321
1322         if (*sk == NULL)
1323                 {
1324                 *sk = sk_X509_ATTRIBUTE_new_null();
1325                 if (*sk == NULL)
1326                         return 0;
1327 new_attrib:
1328                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1329                         return 0;
1330                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1331                         {
1332                         X509_ATTRIBUTE_free(attr);
1333                         return 0;
1334                         }
1335                 }
1336         else
1337                 {
1338                 int i;
1339
1340                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1341                         {
1342                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1343                         if (OBJ_obj2nid(attr->object) == nid)
1344                                 {
1345                                 X509_ATTRIBUTE_free(attr);
1346                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1347                                 if (attr == NULL)
1348                                         return 0;
1349                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1350                                         {
1351                                         X509_ATTRIBUTE_free(attr);
1352                                         return 0;
1353                                         }
1354                                 goto end;
1355                                 }
1356                         }
1357                 goto new_attrib;
1358                 }
1359 end:
1360         return(1);
1361         }
1362