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 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 142         {
 143         int i;
 144         BIO *out=NULL,*btmp=NULL;
 145         X509_ALGOR *xa = NULL;
 146         const EVP_CIPHER *evp_cipher=NULL;
 147         STACK_OF(X509_ALGOR) *md_sk=NULL;
 148         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 149         X509_ALGOR *xalg=NULL;
 150         PKCS7_RECIP_INFO *ri=NULL;
 151         EVP_PKEY *pkey;
 152         ASN1_OCTET_STRING *os=NULL;
 153
 154         i=OBJ_obj2nid(p7->type);
 155         p7->state=PKCS7_S_HEADER;
 156
 157         switch (i)
 158                 {
 159         case NID_pkcs7_signed:
 160                 md_sk=p7->d.sign->md_algs;
 161                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 162                 break;
 163         case NID_pkcs7_signedAndEnveloped:
 164                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 165                 md_sk=p7->d.signed_and_enveloped->md_algs;
 166                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 167                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 168                 if (evp_cipher == NULL)
 169                         {
 170                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 171                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 172                         goto err;
 173                         }
 174                 break;
 175         case NID_pkcs7_enveloped:
 176                 rsk=p7->d.enveloped->recipientinfo;
 177                 xalg=p7->d.enveloped->enc_data->algorithm;
 178                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 179                 if (evp_cipher == NULL)
 180                         {
 181                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 182                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 183                         goto err;
 184                         }
 185                 break;
 186         case NID_pkcs7_digest:
 187                 xa = p7->d.digest->md;
 188                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 189                 break;
 190         default:
 191                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 192                 goto err;
 193                 }
 194
 195         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 196                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 197                         goto err;
 198
 199         if (xa && !PKCS7_bio_add_digest(&out, xa))
 200                         goto err;
 201
 202         if (evp_cipher != NULL)
 203                 {
 204                 unsigned char key[EVP_MAX_KEY_LENGTH];
 205                 unsigned char iv[EVP_MAX_IV_LENGTH];
 206                 int keylen,ivlen;
 207                 int jj,max;
 208                 unsigned char *tmp;
 209                 EVP_CIPHER_CTX *ctx;
 210
 211                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 212                         {
 213                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 214                         goto err;
 215                         }
 216                 BIO_get_cipher_ctx(btmp, &ctx);
 217                 keylen=EVP_CIPHER_key_length(evp_cipher);
 218                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 219                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 220                 if (ivlen > 0)
 221                         if (RAND_pseudo_bytes(iv,ivlen) <= 0)
 222                                 goto err;
 223                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 224                         goto err;
 225                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 226                         goto err;
 227                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 228                         goto err;
 229
 230                 if (ivlen > 0) {
 231                         if (xalg->parameter == NULL) {
 232                                 xalg->parameter = ASN1_TYPE_new();
 233                                 if (xalg->parameter == NULL)
 234                                         goto err;
 235                         }
 236                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 237                                goto err;
 238                 }
 239
 240                 /* Lets do the pub key stuff :-) */
 241                 max=0;
 242                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 243                         {
 244                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 245                         if (ri->cert == NULL)
 246                                 {
 247                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 248                                 goto err;
 249                                 }
 250                         if ((pkey=X509_get_pubkey(ri->cert)) == NULL)
 251                                 goto err;
 252                         jj=EVP_PKEY_size(pkey);
 253                         EVP_PKEY_free(pkey);
 254                         if (max < jj) max=jj;
 255                         }
 256                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 257                         {
 258                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 259                         goto err;
 260                         }
 261                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 262                         {
 263                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 264                         if ((pkey=X509_get_pubkey(ri->cert)) == NULL)
 265                                 goto err;
 266                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 267                         EVP_PKEY_free(pkey);
 268                         if (jj <= 0)
 269                                 {
 270                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 271                                 OPENSSL_free(tmp);
 272                                 goto err;
 273                                 }
 274                         if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj))
 275                                 {
 276                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 277                                         ERR_R_MALLOC_FAILURE);
 278                                 OPENSSL_free(tmp);
 279                                 goto err;
 280                                 }
 281                         }
 282                 OPENSSL_free(tmp);
 283                 OPENSSL_cleanse(key, keylen);
 284
 285                 if (out == NULL)
 286                         out=btmp;
 287                 else
 288                         BIO_push(out,btmp);
 289                 btmp=NULL;
 290                 }
 291
 292         if (bio == NULL)
 293                 {
 294                 if (PKCS7_is_detached(p7))
 295                         bio=BIO_new(BIO_s_null());
 296                 else if (os && os->length > 0)
 297                         bio = BIO_new_mem_buf(os->data, os->length);
 298                 if(bio == NULL)
 299                         {
 300                         bio=BIO_new(BIO_s_mem());
 301                         if (bio == NULL)
 302                                 goto err;
 303                         BIO_set_mem_eof_return(bio,0);
 304                         }
 305                 }
 306         BIO_push(out,bio);
 307         bio=NULL;
 308         if (0)
 309                 {
 310 err:
 311                 if (out != NULL)
 312                         BIO_free_all(out);
 313                 if (btmp != NULL)
 314                         BIO_free_all(btmp);
 315                 out=NULL;
 316                 }
 317         return(out);
 318         }
 319
 320 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 321         {
 322         int ret;
 323         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 324                                 pcert->cert_info->issuer);
 325         if (ret)
 326                 return ret;
 327         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 328                                         ri->issuer_and_serial->serial);
 329         }
 330
 331 /* int */
 332 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 333         {
 334         int i,j;
 335         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 336         unsigned char *tmp=NULL;
 337         X509_ALGOR *xa;
 338         ASN1_OCTET_STRING *data_body=NULL;
 339         const EVP_MD *evp_md;
 340         const EVP_CIPHER *evp_cipher=NULL;
 341         EVP_CIPHER_CTX *evp_ctx=NULL;
 342         X509_ALGOR *enc_alg=NULL;
 343         STACK_OF(X509_ALGOR) *md_sk=NULL;
 344         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 345         X509_ALGOR *xalg=NULL;
 346         PKCS7_RECIP_INFO *ri=NULL;
 347
 348         i=OBJ_obj2nid(p7->type);
 349         p7->state=PKCS7_S_HEADER;
 350
 351         switch (i)
 352                 {
 353         case NID_pkcs7_signed:
 354                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 355                 md_sk=p7->d.sign->md_algs;
 356                 break;
 357         case NID_pkcs7_signedAndEnveloped:
 358                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 359                 md_sk=p7->d.signed_and_enveloped->md_algs;
 360                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 361                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 362                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 363                 if (evp_cipher == NULL)
 364                         {
 365                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 366                         goto err;
 367                         }
 368                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 369                 break;
 370         case NID_pkcs7_enveloped:
 371                 rsk=p7->d.enveloped->recipientinfo;
 372                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 373                 data_body=p7->d.enveloped->enc_data->enc_data;
 374                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 375                 if (evp_cipher == NULL)
 376                         {
 377                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 378                         goto err;
 379                         }
 380                 xalg=p7->d.enveloped->enc_data->algorithm;
 381                 break;
 382         default:
 383                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 384                 goto err;
 385                 }
 386
 387         /* We will be checking the signature */
 388         if (md_sk != NULL)
 389                 {
 390                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 391                         {
 392                         xa=sk_X509_ALGOR_value(md_sk,i);
 393                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 394                                 {
 395                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 396                                 goto err;
 397                                 }
 398
 399                         j=OBJ_obj2nid(xa->algorithm);
 400                         evp_md=EVP_get_digestbynid(j);
 401                         if (evp_md == NULL)
 402                                 {
 403                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 404                                 goto err;
 405                                 }
 406
 407                         BIO_set_md(btmp,evp_md);
 408                         if (out == NULL)
 409                                 out=btmp;
 410                         else
 411                                 BIO_push(out,btmp);
 412                         btmp=NULL;
 413                         }
 414                 }
 415
 416         if (evp_cipher != NULL)
 417                 {
 418 #if 0
 419                 unsigned char key[EVP_MAX_KEY_LENGTH];
 420                 unsigned char iv[EVP_MAX_IV_LENGTH];
 421                 unsigned char *p;
 422                 int keylen,ivlen;
 423                 int max;
 424                 X509_OBJECT ret;
 425 #endif
 426                 int jj;
 427
 428                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 429                         {
 430                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 431                         goto err;
 432                         }
 433
 434                 /* It was encrypted, we need to decrypt the secret key
 435                  * with the private key */
 436
 437                 /* Find the recipientInfo which matches the passed certificate
 438                  * (if any)
 439                  */
 440
 441                 if (pcert) {
 442                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 443                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 444                                 if (!pkcs7_cmp_ri(ri, pcert))
 445                                         break;
 446                                 ri=NULL;
 447                         }
 448                         if (ri == NULL) {
 449                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 450                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 451                                 goto err;
 452                         }
 453                 }
 454
 455                 jj=EVP_PKEY_size(pkey);
 456                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 457                 if (tmp == NULL)
 458                         {
 459                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 460                         goto err;
 461                         }
 462
 463                 /* If we haven't got a certificate try each ri in turn */
 464
 465                 if (pcert == NULL)
 466                         {
 467                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 468                                 {
 469                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 470                                 jj=EVP_PKEY_decrypt(tmp,
 471                                         M_ASN1_STRING_data(ri->enc_key),
 472                                         M_ASN1_STRING_length(ri->enc_key),
 473                                                 pkey);
 474                                 if (jj > 0)
 475                                         break;
 476                                 ERR_clear_error();
 477                                 ri = NULL;
 478                                 }
 479                         if (ri == NULL)
 480                                 {
 481                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 482                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
 483                                 goto err;
 484                                 }
 485                         }
 486                 else
 487                         {
 488                         jj=EVP_PKEY_decrypt(tmp,
 489                                 M_ASN1_STRING_data(ri->enc_key),
 490                                 M_ASN1_STRING_length(ri->enc_key), pkey);
 491                         if (jj <= 0)
 492                                 {
 493                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 494                                                                 ERR_R_EVP_LIB);
 495                                 goto err;
 496                                 }
 497                         }
 498
 499                 evp_ctx=NULL;
 500                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 501                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 502                         goto err;
 503                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 504                         goto err;
 505
 506                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 507                         /* Some S/MIME clients don't use the same key
 508                          * and effective key length. The key length is
 509                          * determined by the size of the decrypted RSA key.
 510                          */
 511                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 512                                 {
 513                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 514                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 515                                 goto err;
 516                                 }
 517                 }
 518                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
 519                         goto err;
 520
 521                 OPENSSL_cleanse(tmp,jj);
 522
 523                 if (out == NULL)
 524                         out=etmp;
 525                 else
 526                         BIO_push(out,etmp);
 527                 etmp=NULL;
 528                 }
 529
 530 #if 1
 531         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 532                 {
 533                 bio=in_bio;
 534                 }
 535         else
 536                 {
 537 #if 0
 538                 bio=BIO_new(BIO_s_mem());
 539                 /* We need to set this so that when we have read all
 540                  * the data, the encrypt BIO, if present, will read
 541                  * EOF and encode the last few bytes */
 542                 BIO_set_mem_eof_return(bio,0);
 543
 544                 if (data_body->length > 0)
 545                         BIO_write(bio,(char *)data_body->data,data_body->length);
 546 #else
 547                 if (data_body->length > 0)
 548                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 549                 else {
 550                         bio=BIO_new(BIO_s_mem());
 551                         BIO_set_mem_eof_return(bio,0);
 552                 }
 553                 if (bio == NULL)
 554                         goto err;
 555 #endif
 556                 }
 557         BIO_push(out,bio);
 558         bio=NULL;
 559 #endif
 560         if (0)
 561                 {
 562 err:
 563                 if (out != NULL) BIO_free_all(out);
 564                 if (btmp != NULL) BIO_free_all(btmp);
 565                 if (etmp != NULL) BIO_free_all(etmp);
 566                 if (bio != NULL) BIO_free_all(bio);
 567                 out=NULL;
 568                 }
 569         if (tmp != NULL)
 570                 OPENSSL_free(tmp);
 571         return(out);
 572         }
 573
 574 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 575         {
 576         for (;;)
 577                 {
 578                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 579                 if (bio == NULL)
 580                         {
 581                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 582                         return NULL;
 583                         }
 584                 BIO_get_md_ctx(bio,pmd);
 585                 if (*pmd == NULL)
 586                         {
 587                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 588                         return NULL;
 589                         }
 590                 if (EVP_MD_CTX_type(*pmd) == nid)
 591                         return bio;
 592                 bio=BIO_next(bio);
 593                 }
 594         return NULL;
 595         }
 596
 597 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 598         {
 599         int ret=0;
 600         int i,j;
 601         BIO *btmp;
 602         BUF_MEM *buf_mem=NULL;
 603         BUF_MEM *buf=NULL;
 604         PKCS7_SIGNER_INFO *si;
 605         EVP_MD_CTX *mdc,ctx_tmp;
 606         STACK_OF(X509_ATTRIBUTE) *sk;
 607         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 608         ASN1_OCTET_STRING *os=NULL;
 609
 610         EVP_MD_CTX_init(&ctx_tmp);
 611         i=OBJ_obj2nid(p7->type);
 612         p7->state=PKCS7_S_HEADER;
 613
 614         switch (i)
 615                 {
 616         case NID_pkcs7_signedAndEnveloped:
 617                 /* XXXXXXXXXXXXXXXX */
 618                 si_sk=p7->d.signed_and_enveloped->signer_info;
 619                 if (!(os=M_ASN1_OCTET_STRING_new()))
 620                         {
 621                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 622                         goto err;
 623                         }
 624                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 625                 break;
 626         case NID_pkcs7_enveloped:
 627                 /* XXXXXXXXXXXXXXXX */
 628                 if (!(os=M_ASN1_OCTET_STRING_new()))
 629                         {
 630                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 631                         goto err;
 632                         }
 633                 p7->d.enveloped->enc_data->enc_data=os;
 634                 break;
 635         case NID_pkcs7_signed:
 636                 si_sk=p7->d.sign->signer_info;
 637                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 638                 /* If detached data then the content is excluded */
 639                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 640                         M_ASN1_OCTET_STRING_free(os);
 641                         p7->d.sign->contents->d.data = NULL;
 642                 }
 643                 break;
 644
 645         case NID_pkcs7_digest:
 646                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 647                 /* If detached data then the content is excluded */
 648                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 649                         {
 650                         M_ASN1_OCTET_STRING_free(os);
 651                         p7->d.digest->contents->d.data = NULL;
 652                         }
 653                 break;
 654
 655                 }
 656
 657         if (si_sk != NULL)
 658                 {
 659                 if ((buf=BUF_MEM_new()) == NULL)
 660                         {
 661                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 662                         goto err;
 663                         }
 664                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 665                         {
 666                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 667                         if (si->pkey == NULL) continue;
 668
 669                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 670
 671                         btmp=bio;
 672
 673                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 674
 675                         if (btmp == NULL)
 676                                 goto err;
 677
 678                         /* We now have the EVP_MD_CTX, lets do the
 679                          * signing. */
 680                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 681                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 682                                 {
 683                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 684                                 goto err;
 685                                 }
 686
 687                         sk=si->auth_attr;
 688
 689                         /* If there are attributes, we add the digest
 690                          * attribute and only sign the attributes */
 691                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 692                                 {
 693                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 694                                 unsigned int md_len, alen;
 695                                 ASN1_OCTET_STRING *digest;
 696                                 ASN1_UTCTIME *sign_time;
 697                                 const EVP_MD *md_tmp;
 698
 699                                 /* Add signing time if not already present */
 700                                 if (!PKCS7_get_signed_attribute(si,
 701                                                         NID_pkcs9_signingTime))
 702                                         {
 703                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
 704                                                 {
 705                                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 706                                                         ERR_R_MALLOC_FAILURE);
 707                                                 goto err;
 708                                                 }
 709                                         if (!PKCS7_add_signed_attribute(si,
 710                                                 NID_pkcs9_signingTime,
 711                                                 V_ASN1_UTCTIME,sign_time))
 712                                                 {
 713                                                 M_ASN1_UTCTIME_free(sign_time);
 714                                                 goto err;
 715                                                 }
 716                                         }
 717
 718                                 /* Add digest */
 719                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 720                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 721                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
 722                                         {
 723                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 724                                                 ERR_R_MALLOC_FAILURE);
 725                                         goto err;
 726                                         }
 727                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
 728                                                                 md_len))
 729                                         {
 730                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 731                                                 ERR_R_MALLOC_FAILURE);
 732                                         M_ASN1_OCTET_STRING_free(digest);
 733                                         goto err;
 734                                         }
 735                                 if (!PKCS7_add_signed_attribute(si,
 736                                         NID_pkcs9_messageDigest,
 737                                         V_ASN1_OCTET_STRING,digest))
 738                                         {
 739                                         M_ASN1_OCTET_STRING_free(digest);
 740                                         goto err;
 741                                         }
 742
 743                                 /* Now sign the attributes */
 744                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 745                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 746                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 747                                 if(!abuf) goto err;
 748                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 749                                 OPENSSL_free(abuf);
 750                                 }
 751
 752 #ifndef OPENSSL_NO_DSA
 753                         if (si->pkey->type == EVP_PKEY_DSA)
 754                                 ctx_tmp.digest=EVP_dss1();
 755 #endif
 756 #ifndef OPENSSL_NO_ECDSA
 757                         if (si->pkey->type == EVP_PKEY_EC)
 758                                 ctx_tmp.digest=EVP_ecdsa();
 759 #endif
 760
 761                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 762                                 (unsigned int *)&buf->length,si->pkey))
 763                                 {
 764                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
 765                                 goto err;
 766                                 }
 767                         if (!ASN1_STRING_set(si->enc_digest,
 768                                 (unsigned char *)buf->data,buf->length))
 769                                 {
 770                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
 771                                 goto err;
 772                                 }
 773                         }
 774                 }
 775         else if (i == NID_pkcs7_digest)
 776                 {
 777                 unsigned char md_data[EVP_MAX_MD_SIZE];
 778                 unsigned int md_len;
 779                 if (!PKCS7_find_digest(&mdc, bio,
 780                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 781                         goto err;
 782                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 783                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 784                 }
 785
 786         if (!PKCS7_is_detached(p7))
 787                 {
 788                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 789                 if (btmp == NULL)
 790                         {
 791                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 792                         goto err;
 793                         }
 794                 BIO_get_mem_ptr(btmp,&buf_mem);
 795                 /* Mark the BIO read only then we can use its copy of the data
 796                  * instead of making an extra copy.
 797                  */
 798                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 799                 BIO_set_mem_eof_return(btmp, 0);
 800                 os->data = (unsigned char *)buf_mem->data;
 801                 os->length = buf_mem->length;
 802 #if 0
 803                 M_ASN1_OCTET_STRING_set(os,
 804                         (unsigned char *)buf_mem->data,buf_mem->length);
 805 #endif
 806                 }
 807         ret=1;
 808 err:
 809         EVP_MD_CTX_cleanup(&ctx_tmp);
 810         if (buf != NULL) BUF_MEM_free(buf);
 811         return(ret);
 812         }
 813
 814 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 815              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 816         {
 817         PKCS7_ISSUER_AND_SERIAL *ias;
 818         int ret=0,i;
 819         STACK_OF(X509) *cert;
 820         X509 *x509;
 821
 822         if (PKCS7_type_is_signed(p7))
 823                 {
 824                 cert=p7->d.sign->cert;
 825                 }
 826         else if (PKCS7_type_is_signedAndEnveloped(p7))
 827                 {
 828                 cert=p7->d.signed_and_enveloped->cert;
 829                 }
 830         else
 831                 {
 832                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 833                 goto err;
 834                 }
 835         /* XXXXXXXXXXXXXXXXXXXXXXX */
 836         ias=si->issuer_and_serial;
 837
 838         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 839
 840         /* were we able to find the cert in passed to us */
 841         if (x509 == NULL)
 842                 {
 843                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 844                 goto err;
 845                 }
 846
 847         /* Lets verify */
 848         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 849                 {
 850                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 851                 goto err;
 852                 }
 853         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 854         i=X509_verify_cert(ctx);
 855         if (i <= 0)
 856                 {
 857                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 858                 X509_STORE_CTX_cleanup(ctx);
 859                 goto err;
 860                 }
 861         X509_STORE_CTX_cleanup(ctx);
 862
 863         return PKCS7_signatureVerify(bio, p7, si, x509);
 864         err:
 865         return ret;
 866         }
 867
 868 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 869                                                                 X509 *x509)
 870         {
 871         ASN1_OCTET_STRING *os;
 872         EVP_MD_CTX mdc_tmp,*mdc;
 873         int ret=0,i;
 874         int md_type;
 875         STACK_OF(X509_ATTRIBUTE) *sk;
 876         BIO *btmp;
 877         EVP_PKEY *pkey;
 878
 879         EVP_MD_CTX_init(&mdc_tmp);
 880
 881         if (!PKCS7_type_is_signed(p7) &&
 882                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 883                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 884                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 885                 goto err;
 886         }
 887
 888         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 889
 890         btmp=bio;
 891         for (;;)
 892                 {
 893                 if ((btmp == NULL) ||
 894                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 895                         {
 896                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 897                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 898                         goto err;
 899                         }
 900                 BIO_get_md_ctx(btmp,&mdc);
 901                 if (mdc == NULL)
 902                         {
 903                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 904                                                         ERR_R_INTERNAL_ERROR);
 905                         goto err;
 906                         }
 907                 if (EVP_MD_CTX_type(mdc) == md_type)
 908                         break;
 909                 /* Workaround for some broken clients that put the signature
 910                  * OID instead of the digest OID in digest_alg->algorithm
 911                  */
 912                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 913                         break;
 914                 btmp=BIO_next(btmp);
 915                 }
 916
 917         /* mdc is the digest ctx that we want, unless there are attributes,
 918          * in which case the digest is the signed attributes */
 919         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 920
 921         sk=si->auth_attr;
 922         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 923                 {
 924                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 925                 unsigned int md_len, alen;
 926                 ASN1_OCTET_STRING *message_digest;
 927
 928                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 929                 message_digest=PKCS7_digest_from_attributes(sk);
 930                 if (!message_digest)
 931                         {
 932                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 933                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 934                         goto err;
 935                         }
 936                 if ((message_digest->length != (int)md_len) ||
 937                         (memcmp(message_digest->data,md_dat,md_len)))
 938                         {
 939 #if 0
 940 {
 941 int ii;
 942 for (ii=0; ii<message_digest->length; ii++)
 943         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 944 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 945 }
 946 #endif
 947                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 948                                                         PKCS7_R_DIGEST_FAILURE);
 949                         ret= -1;
 950                         goto err;
 951                         }
 952
 953                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 954
 955                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 956                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 957                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 958
 959                 OPENSSL_free(abuf);
 960                 }
 961
 962         os=si->enc_digest;
 963         pkey = X509_get_pubkey(x509);
 964         if (!pkey)
 965                 {
 966                 ret = -1;
 967                 goto err;
 968                 }
 969 #ifndef OPENSSL_NO_DSA
 970         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 971 #endif
 972 #ifndef OPENSSL_NO_ECDSA
 973         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 974 #endif
 975
 976         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 977         EVP_PKEY_free(pkey);
 978         if (i <= 0)
 979                 {
 980                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 981                                                 PKCS7_R_SIGNATURE_FAILURE);
 982                 ret= -1;
 983                 goto err;
 984                 }
 985         else
 986                 ret=1;
 987 err:
 988         EVP_MD_CTX_cleanup(&mdc_tmp);
 989         return(ret);
 990         }
 991
 992 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 993         {
 994         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 995         PKCS7_RECIP_INFO *ri;
 996         int i;
 997
 998         i=OBJ_obj2nid(p7->type);
 999         if (i != NID_pkcs7_signedAndEnveloped)
1000                 return NULL;
1001         if (p7->d.signed_and_enveloped == NULL)
1002                 return NULL;
1003         rsk=p7->d.signed_and_enveloped->recipientinfo;
1004         if (rsk == NULL)
1005                 return NULL;
1006         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1007         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1008         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1009         return(ri->issuer_and_serial);
1010         }
1011
1012 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1013         {
1014         return(get_attribute(si->auth_attr,nid));
1015         }
1016
1017 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1018         {
1019         return(get_attribute(si->unauth_attr,nid));
1020         }
1021
1022 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1023         {
1024         int i;
1025         X509_ATTRIBUTE *xa;
1026         ASN1_OBJECT *o;
1027
1028         o=OBJ_nid2obj(nid);
1029         if (!o || !sk) return(NULL);
1030         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1031                 {
1032                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1033                 if (OBJ_cmp(xa->object,o) == 0)
1034                         {
1035                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1036                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1037                         else
1038                                 return(NULL);
1039                         }
1040                 }
1041         return(NULL);
1042         }
1043
1044 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1045 {
1046         ASN1_TYPE *astype;
1047         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1048         return astype->value.octet_string;
1049 }
1050
1051 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1052                                 STACK_OF(X509_ATTRIBUTE) *sk)
1053         {
1054         int i;
1055
1056         if (p7si->auth_attr != NULL)
1057                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1058         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1059         if (p7si->auth_attr == NULL)
1060                 return 0;
1061         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1062                 {
1063                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1064                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1065                     == NULL)
1066                         return(0);
1067                 }
1068         return(1);
1069         }
1070
1071 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1072         {
1073         int i;
1074
1075         if (p7si->unauth_attr != NULL)
1076                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1077                                            X509_ATTRIBUTE_free);
1078         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1079         if (p7si->unauth_attr == NULL)
1080                 return 0;
1081         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1082                 {
1083                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1084                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1085                     == NULL)
1086                         return(0);
1087                 }
1088         return(1);
1089         }
1090
1091 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1092              void *value)
1093         {
1094         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1095         }
1096
1097 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1098              void *value)
1099         {
1100         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1101         }
1102
1103 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1104                          void *value)
1105         {
1106         X509_ATTRIBUTE *attr=NULL;
1107
1108         if (*sk == NULL)
1109                 {
1110                 if (!(*sk = sk_X509_ATTRIBUTE_new_null()))
1111                         return 0;
1112 new_attrib:
1113                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1114                         return 0;
1115                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1116                         {
1117                         X509_ATTRIBUTE_free(attr);
1118                         return 0;
1119                         }
1120                 }
1121         else
1122                 {
1123                 int i;
1124
1125                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1126                         {
1127                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1128                         if (OBJ_obj2nid(attr->object) == nid)
1129                                 {
1130                                 X509_ATTRIBUTE_free(attr);
1131                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1132                                 if (attr == NULL)
1133                                         return 0;
1134                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1135                                         {
1136                                         X509_ATTRIBUTE_free(attr);
1137                                         return 0;
1138                                         }
1139                                 goto end;
1140                                 }
1141                         }
1142                 goto new_attrib;
1143                 }
1144 end:
1145         return(1);
1146         }
1147