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 = 0;
 208
 209         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 210         if (!pctx)
 211                 return 0;
 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                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
 239                 goto err;
 240                 }
 241
 242         ret = 1;
 243
 244         *pek = ek;
 245         *peklen = eklen;
 246
 247         err:
 248         if (pctx)
 249                 EVP_PKEY_CTX_free(pctx);
 250         if (!ret && ek)
 251                 OPENSSL_free(ek);
 252
 253         return ret;
 254         }
 255
 256 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 257         {
 258         int i;
 259         BIO *out=NULL,*btmp=NULL;
 260         X509_ALGOR *xa = NULL;
 261         const EVP_CIPHER *evp_cipher=NULL;
 262         STACK_OF(X509_ALGOR) *md_sk=NULL;
 263         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 264         X509_ALGOR *xalg=NULL;
 265         PKCS7_RECIP_INFO *ri=NULL;
 266         ASN1_OCTET_STRING *os=NULL;
 267
 268         i=OBJ_obj2nid(p7->type);
 269         p7->state=PKCS7_S_HEADER;
 270
 271         switch (i)
 272                 {
 273         case NID_pkcs7_signed:
 274                 md_sk=p7->d.sign->md_algs;
 275                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 276                 break;
 277         case NID_pkcs7_signedAndEnveloped:
 278                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 279                 md_sk=p7->d.signed_and_enveloped->md_algs;
 280                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 281                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 282                 if (evp_cipher == NULL)
 283                         {
 284                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 285                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 286                         goto err;
 287                         }
 288                 break;
 289         case NID_pkcs7_enveloped:
 290                 rsk=p7->d.enveloped->recipientinfo;
 291                 xalg=p7->d.enveloped->enc_data->algorithm;
 292                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 293                 if (evp_cipher == NULL)
 294                         {
 295                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 296                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 297                         goto err;
 298                         }
 299                 break;
 300         case NID_pkcs7_digest:
 301                 xa = p7->d.digest->md;
 302                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 303                 break;
 304         case NID_pkcs7_data:
 305                 break;
 306         default:
 307                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 308                 goto err;
 309                 }
 310
 311         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 312                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 313                         goto err;
 314
 315         if (xa && !PKCS7_bio_add_digest(&out, xa))
 316                         goto err;
 317
 318         if (evp_cipher != NULL)
 319                 {
 320                 unsigned char key[EVP_MAX_KEY_LENGTH];
 321                 unsigned char iv[EVP_MAX_IV_LENGTH];
 322                 int keylen,ivlen;
 323                 EVP_CIPHER_CTX *ctx;
 324
 325                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 326                         {
 327                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 328                         goto err;
 329                         }
 330                 BIO_get_cipher_ctx(btmp, &ctx);
 331                 keylen=EVP_CIPHER_key_length(evp_cipher);
 332                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 333                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 334                 if (ivlen > 0)
 335                         if (RAND_pseudo_bytes(iv,ivlen) <= 0)
 336                                 goto err;
 337                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 338                         goto err;
 339                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 340                         goto err;
 341                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 342                         goto err;
 343
 344                 if (ivlen > 0) {
 345                         if (xalg->parameter == NULL) {
 346                                 xalg->parameter = ASN1_TYPE_new();
 347                                 if (xalg->parameter == NULL)
 348                                         goto err;
 349                         }
 350                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 351                                 goto err;
 352                 }
 353
 354                 /* Lets do the pub key stuff :-) */
 355                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 356                         {
 357                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 358                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
 359                                 goto err;
 360                         }
 361                 OPENSSL_cleanse(key, keylen);
 362
 363                 if (out == NULL)
 364                         out=btmp;
 365                 else
 366                         BIO_push(out,btmp);
 367                 btmp=NULL;
 368                 }
 369
 370         if (bio == NULL)
 371                 {
 372                 if (PKCS7_is_detached(p7))
 373                         bio=BIO_new(BIO_s_null());
 374                 else if (os && os->length > 0)
 375                         bio = BIO_new_mem_buf(os->data, os->length);
 376                 if(bio == NULL)
 377                         {
 378                         bio=BIO_new(BIO_s_mem());
 379                         if (bio == NULL)
 380                                 goto err;
 381                         BIO_set_mem_eof_return(bio,0);
 382                         }
 383                 }
 384         if (out)
 385                 BIO_push(out,bio);
 386         else
 387                 out = bio;
 388         bio=NULL;
 389         if (0)
 390                 {
 391 err:
 392                 if (out != NULL)
 393                         BIO_free_all(out);
 394                 if (btmp != NULL)
 395                         BIO_free_all(btmp);
 396                 out=NULL;
 397                 }
 398         return(out);
 399         }
 400
 401 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 402         {
 403         int ret;
 404         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 405                                 pcert->cert_info->issuer);
 406         if (ret)
 407                 return ret;
 408         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 409                                         ri->issuer_and_serial->serial);
 410         }
 411
 412 /* int */
 413 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 414         {
 415         int i,j;
 416         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 417         X509_ALGOR *xa;
 418         ASN1_OCTET_STRING *data_body=NULL;
 419         const EVP_MD *evp_md;
 420         const EVP_CIPHER *evp_cipher=NULL;
 421         EVP_CIPHER_CTX *evp_ctx=NULL;
 422         X509_ALGOR *enc_alg=NULL;
 423         STACK_OF(X509_ALGOR) *md_sk=NULL;
 424         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 425         PKCS7_RECIP_INFO *ri=NULL;
 426
 427         i=OBJ_obj2nid(p7->type);
 428         p7->state=PKCS7_S_HEADER;
 429
 430         switch (i)
 431                 {
 432         case NID_pkcs7_signed:
 433                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 434                 md_sk=p7->d.sign->md_algs;
 435                 break;
 436         case NID_pkcs7_signedAndEnveloped:
 437                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 438                 md_sk=p7->d.signed_and_enveloped->md_algs;
 439                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 440                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 441                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 442                 if (evp_cipher == NULL)
 443                         {
 444                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 445                         goto err;
 446                         }
 447                 break;
 448         case NID_pkcs7_enveloped:
 449                 rsk=p7->d.enveloped->recipientinfo;
 450                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 451                 data_body=p7->d.enveloped->enc_data->enc_data;
 452                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 453                 if (evp_cipher == NULL)
 454                         {
 455                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 456                         goto err;
 457                         }
 458                 break;
 459         default:
 460                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 461                 goto err;
 462                 }
 463
 464         /* We will be checking the signature */
 465         if (md_sk != NULL)
 466                 {
 467                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 468                         {
 469                         xa=sk_X509_ALGOR_value(md_sk,i);
 470                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 471                                 {
 472                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 473                                 goto err;
 474                                 }
 475
 476                         j=OBJ_obj2nid(xa->algorithm);
 477                         evp_md=EVP_get_digestbynid(j);
 478                         if (evp_md == NULL)
 479                                 {
 480                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 481                                 goto err;
 482                                 }
 483
 484                         BIO_set_md(btmp,evp_md);
 485                         if (out == NULL)
 486                                 out=btmp;
 487                         else
 488                                 BIO_push(out,btmp);
 489                         btmp=NULL;
 490                         }
 491                 }
 492
 493         if (evp_cipher != NULL)
 494                 {
 495 #if 0
 496                 unsigned char key[EVP_MAX_KEY_LENGTH];
 497                 unsigned char iv[EVP_MAX_IV_LENGTH];
 498                 unsigned char *p;
 499                 int keylen,ivlen;
 500                 int max;
 501                 X509_OBJECT ret;
 502 #endif
 503                 unsigned char *ek = NULL;
 504                 int eklen;
 505
 506                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 507                         {
 508                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 509                         goto err;
 510                         }
 511
 512                 /* It was encrypted, we need to decrypt the secret key
 513                  * with the private key */
 514
 515                 /* Find the recipientInfo which matches the passed certificate
 516                  * (if any)
 517                  */
 518
 519                 if (pcert)
 520                         {
 521                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 522                                 {
 523                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 524                                 if (!pkcs7_cmp_ri(ri, pcert))
 525                                         break;
 526                                 ri=NULL;
 527                                 }
 528                         if (ri == NULL)
 529                                 {
 530                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 531                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 532                                 goto err;
 533                                 }
 534                         }
 535
 536                 /* If we haven't got a certificate try each ri in turn */
 537
 538                 if (pcert == NULL)
 539                         {
 540                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 541                                 {
 542                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 543                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
 544                                                         ri, pkey) > 0)
 545                                         break;
 546                                 ERR_clear_error();
 547                                 ri = NULL;
 548                                 }
 549                         if (ri == NULL)
 550                                 {
 551                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 552                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
 553                                 goto err;
 554                                 }
 555                         }
 556                 else
 557                         {
 558                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) <= 0)
 559                                 goto err;
 560                         }
 561
 562                 evp_ctx=NULL;
 563                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 564                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 565                         goto err;
 566                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 567                         goto err;
 568
 569                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 570                         /* Some S/MIME clients don't use the same key
 571                          * and effective key length. The key length is
 572                          * determined by the size of the decrypted RSA key.
 573                          */
 574                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
 575                                 {
 576                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 577                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 578                                 goto err;
 579                                 }
 580                 }
 581                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
 582                         goto err;
 583
 584                 if (ek)
 585                         {
 586                         OPENSSL_cleanse(ek,eklen);
 587                         OPENSSL_free(ek);
 588                         }
 589
 590                 if (out == NULL)
 591                         out=etmp;
 592                 else
 593                         BIO_push(out,etmp);
 594                 etmp=NULL;
 595                 }
 596
 597 #if 1
 598         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 599                 {
 600                 bio=in_bio;
 601                 }
 602         else
 603                 {
 604 #if 0
 605                 bio=BIO_new(BIO_s_mem());
 606                 /* We need to set this so that when we have read all
 607                  * the data, the encrypt BIO, if present, will read
 608                  * EOF and encode the last few bytes */
 609                 BIO_set_mem_eof_return(bio,0);
 610
 611                 if (data_body->length > 0)
 612                         BIO_write(bio,(char *)data_body->data,data_body->length);
 613 #else
 614                 if (data_body->length > 0)
 615                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 616                 else {
 617                         bio=BIO_new(BIO_s_mem());
 618                         BIO_set_mem_eof_return(bio,0);
 619                 }
 620                 if (bio == NULL)
 621                         goto err;
 622 #endif
 623                 }
 624         BIO_push(out,bio);
 625         bio=NULL;
 626 #endif
 627         if (0)
 628                 {
 629 err:
 630                 if (out != NULL) BIO_free_all(out);
 631                 if (btmp != NULL) BIO_free_all(btmp);
 632                 if (etmp != NULL) BIO_free_all(etmp);
 633                 if (bio != NULL) BIO_free_all(bio);
 634                 out=NULL;
 635                 }
 636         return(out);
 637         }
 638
 639 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 640         {
 641         for (;;)
 642                 {
 643                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 644                 if (bio == NULL)
 645                         {
 646                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 647                         return NULL;
 648                         }
 649                 BIO_get_md_ctx(bio,pmd);
 650                 if (*pmd == NULL)
 651                         {
 652                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 653                         return NULL;
 654                         }
 655                 if (EVP_MD_CTX_type(*pmd) == nid)
 656                         return bio;
 657                 bio=BIO_next(bio);
 658                 }
 659         return NULL;
 660         }
 661
 662 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
 663         {
 664         unsigned char md_data[EVP_MAX_MD_SIZE];
 665         unsigned int md_len;
 666
 667         /* Add signing time if not already present */
 668         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
 669                 {
 670                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
 671                         {
 672                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
 673                                         ERR_R_MALLOC_FAILURE);
 674                         return 0;
 675                         }
 676                 }
 677
 678         /* Add digest */
 679         EVP_DigestFinal_ex(mctx, md_data,&md_len);
 680         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
 681                 {
 682                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 683                 return 0;
 684                 }
 685
 686         /* Now sign the attributes */
 687         if (!PKCS7_SIGNER_INFO_sign(si))
 688                         return 0;
 689
 690         return 1;
 691         }
 692
 693
 694 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 695         {
 696         int ret=0;
 697         int i,j;
 698         BIO *btmp;
 699         PKCS7_SIGNER_INFO *si;
 700         EVP_MD_CTX *mdc,ctx_tmp;
 701         STACK_OF(X509_ATTRIBUTE) *sk;
 702         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 703         ASN1_OCTET_STRING *os=NULL;
 704
 705         EVP_MD_CTX_init(&ctx_tmp);
 706         i=OBJ_obj2nid(p7->type);
 707         p7->state=PKCS7_S_HEADER;
 708
 709         switch (i)
 710                 {
 711         case NID_pkcs7_data:
 712                 os = p7->d.data;
 713                 break;
 714         case NID_pkcs7_signedAndEnveloped:
 715                 /* XXXXXXXXXXXXXXXX */
 716                 si_sk=p7->d.signed_and_enveloped->signer_info;
 717                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
 718                 if (!os)
 719                         {
 720                         os=M_ASN1_OCTET_STRING_new();
 721                         if (!os)
 722                                 {
 723                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 724                                 goto err;
 725                                 }
 726                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
 727                         }
 728                 break;
 729         case NID_pkcs7_enveloped:
 730                 /* XXXXXXXXXXXXXXXX */
 731                 os = p7->d.enveloped->enc_data->enc_data;
 732                 if (!os)
 733                         {
 734                         os=M_ASN1_OCTET_STRING_new();
 735                         if (!os)
 736                                 {
 737                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 738                                 goto err;
 739                                 }
 740                         p7->d.enveloped->enc_data->enc_data=os;
 741                         }
 742                 break;
 743         case NID_pkcs7_signed:
 744                 si_sk=p7->d.sign->signer_info;
 745                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 746                 /* If detached data then the content is excluded */
 747                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 748                         M_ASN1_OCTET_STRING_free(os);
 749                         p7->d.sign->contents->d.data = NULL;
 750                 }
 751                 break;
 752
 753         case NID_pkcs7_digest:
 754                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 755                 /* If detached data then the content is excluded */
 756                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 757                         {
 758                         M_ASN1_OCTET_STRING_free(os);
 759                         p7->d.digest->contents->d.data = NULL;
 760                         }
 761                 break;
 762
 763         default:
 764                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 765                 goto err;
 766                 }
 767
 768         if (si_sk != NULL)
 769                 {
 770                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 771                         {
 772                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 773                         if (si->pkey == NULL)
 774                                 continue;
 775
 776                         j = OBJ_obj2nid(si->digest_alg->algorithm);
 777
 778                         btmp=bio;
 779
 780                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 781
 782                         if (btmp == NULL)
 783                                 goto err;
 784
 785                         /* We now have the EVP_MD_CTX, lets do the
 786                          * signing. */
 787                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 788
 789                         sk=si->auth_attr;
 790
 791                         /* If there are attributes, we add the digest
 792                          * attribute and only sign the attributes */
 793                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
 794                                 {
 795                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
 796                                         goto err;
 797                                 }
 798                         else
 799                                 {
 800                                 unsigned char *abuf = NULL;
 801                                 unsigned int abuflen;
 802                                 abuflen = EVP_PKEY_size(si->pkey);
 803                                 abuf = OPENSSL_malloc(abuflen);
 804                                 if (!abuf)
 805                                         goto err;
 806
 807                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
 808                                                         si->pkey))
 809                                         {
 810                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 811                                                         ERR_R_EVP_LIB);
 812                                         goto err;
 813                                         }
 814                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
 815                                 }
 816                         }
 817                 }
 818         else if (i == NID_pkcs7_digest)
 819                 {
 820                 unsigned char md_data[EVP_MAX_MD_SIZE];
 821                 unsigned int md_len;
 822                 if (!PKCS7_find_digest(&mdc, bio,
 823                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 824                         goto err;
 825                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 826                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 827                 }
 828
 829         if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
 830                 {
 831                 char *cont;
 832                 long contlen;
 833                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 834                 if (btmp == NULL)
 835                         {
 836                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 837                         goto err;
 838                         }
 839                 contlen = BIO_get_mem_data(btmp, &cont);
 840                 /* Mark the BIO read only then we can use its copy of the data
 841                  * instead of making an extra copy.
 842                  */
 843                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 844                 BIO_set_mem_eof_return(btmp, 0);
 845                 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 846                 }
 847         ret=1;
 848 err:
 849         EVP_MD_CTX_cleanup(&ctx_tmp);
 850         return(ret);
 851         }
 852
 853 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
 854         {
 855         EVP_MD_CTX mctx;
 856         EVP_PKEY_CTX *pctx;
 857         unsigned char *abuf = NULL;
 858         int alen;
 859         size_t siglen;
 860         const EVP_MD *md = NULL;
 861
 862         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
 863         if (md == NULL)
 864                 return 0;
 865
 866         EVP_MD_CTX_init(&mctx);
 867         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
 868                 goto err;
 869
 870         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 871                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
 872                 {
 873                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 874                 goto err;
 875                 }
 876
 877         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
 878                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 879         if(!abuf)
 880                 goto err;
 881         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
 882                 goto err;
 883         OPENSSL_free(abuf);
 884         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 885                 goto err;
 886         abuf = OPENSSL_malloc(siglen);
 887         if(!abuf)
 888                 goto err;
 889         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 890                 goto err;
 891
 892         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 893                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
 894                 {
 895                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 896                 goto err;
 897                 }
 898
 899         EVP_MD_CTX_cleanup(&mctx);
 900
 901         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
 902
 903         return 1;
 904
 905         err:
 906         if (abuf)
 907                 OPENSSL_free(abuf);
 908         EVP_MD_CTX_cleanup(&mctx);
 909         return 0;
 910
 911         }
 912
 913 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 914              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 915         {
 916         PKCS7_ISSUER_AND_SERIAL *ias;
 917         int ret=0,i;
 918         STACK_OF(X509) *cert;
 919         X509 *x509;
 920
 921         if (PKCS7_type_is_signed(p7))
 922                 {
 923                 cert=p7->d.sign->cert;
 924                 }
 925         else if (PKCS7_type_is_signedAndEnveloped(p7))
 926                 {
 927                 cert=p7->d.signed_and_enveloped->cert;
 928                 }
 929         else
 930                 {
 931                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 932                 goto err;
 933                 }
 934         /* XXXXXXXXXXXXXXXXXXXXXXX */
 935         ias=si->issuer_and_serial;
 936
 937         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 938
 939         /* were we able to find the cert in passed to us */
 940         if (x509 == NULL)
 941                 {
 942                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 943                 goto err;
 944                 }
 945
 946         /* Lets verify */
 947         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 948                 {
 949                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 950                 goto err;
 951                 }
 952         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 953         i=X509_verify_cert(ctx);
 954         if (i <= 0)
 955                 {
 956                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 957                 X509_STORE_CTX_cleanup(ctx);
 958                 goto err;
 959                 }
 960         X509_STORE_CTX_cleanup(ctx);
 961
 962         return PKCS7_signatureVerify(bio, p7, si, x509);
 963         err:
 964         return ret;
 965         }
 966
 967 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 968                                                                 X509 *x509)
 969         {
 970         ASN1_OCTET_STRING *os;
 971         EVP_MD_CTX mdc_tmp,*mdc;
 972         int ret=0,i;
 973         int md_type;
 974         STACK_OF(X509_ATTRIBUTE) *sk;
 975         BIO *btmp;
 976         EVP_PKEY *pkey;
 977
 978         EVP_MD_CTX_init(&mdc_tmp);
 979
 980         if (!PKCS7_type_is_signed(p7) &&
 981                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 982                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 983                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 984                 goto err;
 985         }
 986
 987         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 988
 989         btmp=bio;
 990         for (;;)
 991                 {
 992                 if ((btmp == NULL) ||
 993                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 994                         {
 995                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 996                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 997                         goto err;
 998                         }
 999                 BIO_get_md_ctx(btmp,&mdc);
1000                 if (mdc == NULL)
1001                         {
1002                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1003                                                         ERR_R_INTERNAL_ERROR);
1004                         goto err;
1005                         }
1006                 if (EVP_MD_CTX_type(mdc) == md_type)
1007                         break;
1008                 /* Workaround for some broken clients that put the signature
1009                  * OID instead of the digest OID in digest_alg->algorithm
1010                  */
1011                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1012                         break;
1013                 btmp=BIO_next(btmp);
1014                 }
1015
1016         /* mdc is the digest ctx that we want, unless there are attributes,
1017          * in which case the digest is the signed attributes */
1018         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
1019
1020         sk=si->auth_attr;
1021         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1022                 {
1023                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1024                 unsigned int md_len;
1025                 int alen;
1026                 ASN1_OCTET_STRING *message_digest;
1027
1028                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
1029                 message_digest=PKCS7_digest_from_attributes(sk);
1030                 if (!message_digest)
1031                         {
1032                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1033                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1034                         goto err;
1035                         }
1036                 if ((message_digest->length != (int)md_len) ||
1037                         (memcmp(message_digest->data,md_dat,md_len)))
1038                         {
1039 #if 0
1040 {
1041 int ii;
1042 for (ii=0; ii<message_digest->length; ii++)
1043         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1044 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1045 }
1046 #endif
1047                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1048                                                         PKCS7_R_DIGEST_FAILURE);
1049                         ret= -1;
1050                         goto err;
1051                         }
1052
1053                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
1054
1055                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1056                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1057                 if (alen <= 0)
1058                         {
1059                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1060                         ret = -1;
1061                         goto err;
1062                         }
1063                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
1064
1065                 OPENSSL_free(abuf);
1066                 }
1067
1068         os=si->enc_digest;
1069         pkey = X509_get_pubkey(x509);
1070         if (!pkey)
1071                 {
1072                 ret = -1;
1073                 goto err;
1074                 }
1075
1076         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1077         EVP_PKEY_free(pkey);
1078         if (i <= 0)
1079                 {
1080                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1081                                                 PKCS7_R_SIGNATURE_FAILURE);
1082                 ret= -1;
1083                 goto err;
1084                 }
1085         else
1086                 ret=1;
1087 err:
1088         EVP_MD_CTX_cleanup(&mdc_tmp);
1089         return(ret);
1090         }
1091
1092 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1093         {
1094         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1095         PKCS7_RECIP_INFO *ri;
1096         int i;
1097
1098         i=OBJ_obj2nid(p7->type);
1099         if (i != NID_pkcs7_signedAndEnveloped)
1100                 return NULL;
1101         if (p7->d.signed_and_enveloped == NULL)
1102                 return NULL;
1103         rsk=p7->d.signed_and_enveloped->recipientinfo;
1104         if (rsk == NULL)
1105                 return NULL;
1106         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1107         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1108         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1109         return(ri->issuer_and_serial);
1110         }
1111
1112 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1113         {
1114         return(get_attribute(si->auth_attr,nid));
1115         }
1116
1117 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1118         {
1119         return(get_attribute(si->unauth_attr,nid));
1120         }
1121
1122 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1123         {
1124         int i;
1125         X509_ATTRIBUTE *xa;
1126         ASN1_OBJECT *o;
1127
1128         o=OBJ_nid2obj(nid);
1129         if (!o || !sk) return(NULL);
1130         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1131                 {
1132                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1133                 if (OBJ_cmp(xa->object,o) == 0)
1134                         {
1135                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1136                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1137                         else
1138                                 return(NULL);
1139                         }
1140                 }
1141         return(NULL);
1142         }
1143
1144 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1145 {
1146         ASN1_TYPE *astype;
1147         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1148         return astype->value.octet_string;
1149 }
1150
1151 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1152                                 STACK_OF(X509_ATTRIBUTE) *sk)
1153         {
1154         int i;
1155
1156         if (p7si->auth_attr != NULL)
1157                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1158         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1159         if (p7si->auth_attr == NULL)
1160                 return 0;
1161         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1162                 {
1163                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1164                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1165                     == NULL)
1166                         return(0);
1167                 }
1168         return(1);
1169         }
1170
1171 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1172         {
1173         int i;
1174
1175         if (p7si->unauth_attr != NULL)
1176                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1177                                            X509_ATTRIBUTE_free);
1178         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1179         if (p7si->unauth_attr == NULL)
1180                 return 0;
1181         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1182                 {
1183                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1184                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1185                     == NULL)
1186                         return(0);
1187                 }
1188         return(1);
1189         }
1190
1191 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1192              void *value)
1193         {
1194         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1195         }
1196
1197 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1198              void *value)
1199         {
1200         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1201         }
1202
1203 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1204                          void *value)
1205         {
1206         X509_ATTRIBUTE *attr=NULL;
1207
1208         if (*sk == NULL)
1209                 {
1210                 *sk = sk_X509_ATTRIBUTE_new_null();
1211                 if (*sk == NULL)
1212                         return 0;
1213 new_attrib:
1214                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1215                         return 0;
1216                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1217                         {
1218                         X509_ATTRIBUTE_free(attr);
1219                         return 0;
1220                         }
1221                 }
1222         else
1223                 {
1224                 int i;
1225
1226                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1227                         {
1228                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1229                         if (OBJ_obj2nid(attr->object) == nid)
1230                                 {
1231                                 X509_ATTRIBUTE_free(attr);
1232                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1233                                 if (attr == NULL)
1234                                         return 0;
1235                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1236                                         {
1237                                         X509_ATTRIBUTE_free(attr);
1238                                         return 0;
1239                                         }
1240                                 goto end;
1241                                 }
1242                         }
1243                 goto new_attrib;
1244                 }
1245 end:
1246         return(1);
1247         }
1248