crypto/openssl/crypto/pkcs7/pk7_lib.c

   1 /* crypto/pkcs7/pk7_lib.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/objects.h>
  62 #include <openssl/x509.h>
  63 #include "asn1_locl.h"
  64
  65 long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
  66         {
  67         int nid;
  68         long ret;
  69
  70         nid=OBJ_obj2nid(p7->type);
  71
  72         switch (cmd)
  73                 {
  74         /* NOTE(emilia): does not support detached digested data. */
  75         case PKCS7_OP_SET_DETACHED_SIGNATURE:
  76                 if (nid == NID_pkcs7_signed)
  77                         {
  78                         ret=p7->detached=(int)larg;
  79                         if (ret && PKCS7_type_is_data(p7->d.sign->contents))
  80                                         {
  81                                         ASN1_OCTET_STRING *os;
  82                                         os=p7->d.sign->contents->d.data;
  83                                         ASN1_OCTET_STRING_free(os);
  84                                         p7->d.sign->contents->d.data = NULL;
  85                                         }
  86                         }
  87                 else
  88                         {
  89                         PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
  90                         ret=0;
  91                         }
  92                 break;
  93         case PKCS7_OP_GET_DETACHED_SIGNATURE:
  94                 if (nid == NID_pkcs7_signed)
  95                         {
  96                         if(!p7->d.sign  || !p7->d.sign->contents->d.ptr)
  97                                 ret = 1;
  98                         else ret = 0;
  99
 100                         p7->detached = ret;
 101                         }
 102                 else
 103                         {
 104                         PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
 105                         ret=0;
 106                         }
 107
 108                 break;
 109         default:
 110                 PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_UNKNOWN_OPERATION);
 111                 ret=0;
 112                 }
 113         return(ret);
 114         }
 115
 116 int PKCS7_content_new(PKCS7 *p7, int type)
 117         {
 118         PKCS7 *ret=NULL;
 119
 120         if ((ret=PKCS7_new()) == NULL) goto err;
 121         if (!PKCS7_set_type(ret,type)) goto err;
 122         if (!PKCS7_set_content(p7,ret)) goto err;
 123
 124         return(1);
 125 err:
 126         if (ret != NULL) PKCS7_free(ret);
 127         return(0);
 128         }
 129
 130 int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
 131         {
 132         int i;
 133
 134         i=OBJ_obj2nid(p7->type);
 135         switch (i)
 136                 {
 137         case NID_pkcs7_signed:
 138                 if (p7->d.sign->contents != NULL)
 139                         PKCS7_free(p7->d.sign->contents);
 140                 p7->d.sign->contents=p7_data;
 141                 break;
 142         case NID_pkcs7_digest:
 143                 if (p7->d.digest->contents != NULL)
 144                         PKCS7_free(p7->d.digest->contents);
 145                 p7->d.digest->contents=p7_data;
 146                 break;
 147         case NID_pkcs7_data:
 148         case NID_pkcs7_enveloped:
 149         case NID_pkcs7_signedAndEnveloped:
 150         case NID_pkcs7_encrypted:
 151         default:
 152                 PKCS7err(PKCS7_F_PKCS7_SET_CONTENT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 153                 goto err;
 154                 }
 155         return(1);
 156 err:
 157         return(0);
 158         }
 159
 160 int PKCS7_set_type(PKCS7 *p7, int type)
 161         {
 162         ASN1_OBJECT *obj;
 163
 164         /*PKCS7_content_free(p7);*/
 165         obj=OBJ_nid2obj(type); /* will not fail */
 166
 167         switch (type)
 168                 {
 169         case NID_pkcs7_signed:
 170                 p7->type=obj;
 171                 if ((p7->d.sign=PKCS7_SIGNED_new()) == NULL)
 172                         goto err;
 173                 if (!ASN1_INTEGER_set(p7->d.sign->version,1))
 174                         {
 175                         PKCS7_SIGNED_free(p7->d.sign);
 176                         p7->d.sign=NULL;
 177                         goto err;
 178                         }
 179                 break;
 180         case NID_pkcs7_data:
 181                 p7->type=obj;
 182                 if ((p7->d.data=M_ASN1_OCTET_STRING_new()) == NULL)
 183                         goto err;
 184                 break;
 185         case NID_pkcs7_signedAndEnveloped:
 186                 p7->type=obj;
 187                 if ((p7->d.signed_and_enveloped=PKCS7_SIGN_ENVELOPE_new())
 188                         == NULL) goto err;
 189                 ASN1_INTEGER_set(p7->d.signed_and_enveloped->version,1);
 190                 if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version,1))
 191                         goto err;
 192                 p7->d.signed_and_enveloped->enc_data->content_type
 193                                                 = OBJ_nid2obj(NID_pkcs7_data);
 194                 break;
 195         case NID_pkcs7_enveloped:
 196                 p7->type=obj;
 197                 if ((p7->d.enveloped=PKCS7_ENVELOPE_new())
 198                         == NULL) goto err;
 199                 if (!ASN1_INTEGER_set(p7->d.enveloped->version,0))
 200                         goto err;
 201                 p7->d.enveloped->enc_data->content_type
 202                                                 = OBJ_nid2obj(NID_pkcs7_data);
 203                 break;
 204         case NID_pkcs7_encrypted:
 205                 p7->type=obj;
 206                 if ((p7->d.encrypted=PKCS7_ENCRYPT_new())
 207                         == NULL) goto err;
 208                 if (!ASN1_INTEGER_set(p7->d.encrypted->version,0))
 209                         goto err;
 210                 p7->d.encrypted->enc_data->content_type
 211                                                 = OBJ_nid2obj(NID_pkcs7_data);
 212                 break;
 213
 214         case NID_pkcs7_digest:
 215                 p7->type=obj;
 216                 if ((p7->d.digest=PKCS7_DIGEST_new())
 217                         == NULL) goto err;
 218                 if (!ASN1_INTEGER_set(p7->d.digest->version,0))
 219                         goto err;
 220                 break;
 221         default:
 222                 PKCS7err(PKCS7_F_PKCS7_SET_TYPE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 223                 goto err;
 224                 }
 225         return(1);
 226 err:
 227         return(0);
 228         }
 229
 230 int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
 231         {
 232         p7->type = OBJ_nid2obj(type);
 233         p7->d.other = other;
 234         return 1;
 235         }
 236
 237 int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
 238         {
 239         int i,j,nid;
 240         X509_ALGOR *alg;
 241         STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
 242         STACK_OF(X509_ALGOR) *md_sk;
 243
 244         i=OBJ_obj2nid(p7->type);
 245         switch (i)
 246                 {
 247         case NID_pkcs7_signed:
 248                 signer_sk=      p7->d.sign->signer_info;
 249                 md_sk=          p7->d.sign->md_algs;
 250                 break;
 251         case NID_pkcs7_signedAndEnveloped:
 252                 signer_sk=      p7->d.signed_and_enveloped->signer_info;
 253                 md_sk=          p7->d.signed_and_enveloped->md_algs;
 254                 break;
 255         default:
 256                 PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,PKCS7_R_WRONG_CONTENT_TYPE);
 257                 return(0);
 258                 }
 259
 260         nid=OBJ_obj2nid(psi->digest_alg->algorithm);
 261
 262         /* If the digest is not currently listed, add it */
 263         j=0;
 264         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 265                 {
 266                 alg=sk_X509_ALGOR_value(md_sk,i);
 267                 if (OBJ_obj2nid(alg->algorithm) == nid)
 268                         {
 269                         j=1;
 270                         break;
 271                         }
 272                 }
 273         if (!j) /* we need to add another algorithm */
 274                 {
 275                 if(!(alg=X509_ALGOR_new())
 276                         || !(alg->parameter = ASN1_TYPE_new()))
 277                         {
 278                         X509_ALGOR_free(alg);
 279                         PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,ERR_R_MALLOC_FAILURE);
 280                         return(0);
 281                         }
 282                 alg->algorithm=OBJ_nid2obj(nid);
 283                 alg->parameter->type = V_ASN1_NULL;
 284                 if (!sk_X509_ALGOR_push(md_sk,alg))
 285                         {
 286                         X509_ALGOR_free(alg);
 287                         return 0;
 288                         }
 289                 }
 290
 291         if (!sk_PKCS7_SIGNER_INFO_push(signer_sk,psi))
 292                 return 0;
 293         return(1);
 294         }
 295
 296 int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
 297         {
 298         int i;
 299         STACK_OF(X509) **sk;
 300
 301         i=OBJ_obj2nid(p7->type);
 302         switch (i)
 303                 {
 304         case NID_pkcs7_signed:
 305                 sk= &(p7->d.sign->cert);
 306                 break;
 307         case NID_pkcs7_signedAndEnveloped:
 308                 sk= &(p7->d.signed_and_enveloped->cert);
 309                 break;
 310         default:
 311                 PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE,PKCS7_R_WRONG_CONTENT_TYPE);
 312                 return(0);
 313                 }
 314
 315         if (*sk == NULL)
 316                 *sk=sk_X509_new_null();
 317         if (*sk == NULL)
 318                 {
 319                 PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);
 320                 return 0;
 321                 }
 322         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 323         if (!sk_X509_push(*sk,x509))
 324                 {
 325                 X509_free(x509);
 326                 return 0;
 327                 }
 328         return(1);
 329         }
 330
 331 int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
 332         {
 333         int i;
 334         STACK_OF(X509_CRL) **sk;
 335
 336         i=OBJ_obj2nid(p7->type);
 337         switch (i)
 338                 {
 339         case NID_pkcs7_signed:
 340                 sk= &(p7->d.sign->crl);
 341                 break;
 342         case NID_pkcs7_signedAndEnveloped:
 343                 sk= &(p7->d.signed_and_enveloped->crl);
 344                 break;
 345         default:
 346                 PKCS7err(PKCS7_F_PKCS7_ADD_CRL,PKCS7_R_WRONG_CONTENT_TYPE);
 347                 return(0);
 348                 }
 349
 350         if (*sk == NULL)
 351                 *sk=sk_X509_CRL_new_null();
 352         if (*sk == NULL)
 353                 {
 354                 PKCS7err(PKCS7_F_PKCS7_ADD_CRL,ERR_R_MALLOC_FAILURE);
 355                 return 0;
 356                 }
 357
 358         CRYPTO_add(&crl->references,1,CRYPTO_LOCK_X509_CRL);
 359         if (!sk_X509_CRL_push(*sk,crl))
 360                 {
 361                 X509_CRL_free(crl);
 362                 return 0;
 363                 }
 364         return(1);
 365         }
 366
 367 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
 368              const EVP_MD *dgst)
 369         {
 370         int ret;
 371
 372         /* We now need to add another PKCS7_SIGNER_INFO entry */
 373         if (!ASN1_INTEGER_set(p7i->version,1))
 374                 goto err;
 375         if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
 376                         X509_get_issuer_name(x509)))
 377                 goto err;
 378
 379         /* because ASN1_INTEGER_set is used to set a 'long' we will do
 380          * things the ugly way. */
 381         M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
 382         if (!(p7i->issuer_and_serial->serial=
 383                         M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
 384                 goto err;
 385
 386         /* lets keep the pkey around for a while */
 387         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 388         p7i->pkey=pkey;
 389
 390         /* Set the algorithms */
 391
 392         X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
 393                                 V_ASN1_NULL, NULL);
 394
 395         if (pkey->ameth && pkey->ameth->pkey_ctrl)
 396                 {
 397                 ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN,
 398                                                 0, p7i);
 399                 if (ret > 0)
 400                         return 1;
 401                 if (ret != -2)
 402                         {
 403                         PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
 404                                         PKCS7_R_SIGNING_CTRL_FAILURE);
 405                         return 0;
 406                         }
 407                 }
 408         PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
 409                         PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 410 err:
 411         return 0;
 412         }
 413
 414 PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
 415              const EVP_MD *dgst)
 416         {
 417         PKCS7_SIGNER_INFO *si = NULL;
 418
 419         if (dgst == NULL)
 420                 {
 421                 int def_nid;
 422                 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
 423                         goto err;
 424                 dgst = EVP_get_digestbynid(def_nid);
 425                 if (dgst == NULL)
 426                         {
 427                         PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE,
 428                                                 PKCS7_R_NO_DEFAULT_DIGEST);
 429                         goto err;
 430                         }
 431                 }
 432
 433         if ((si=PKCS7_SIGNER_INFO_new()) == NULL) goto err;
 434         if (!PKCS7_SIGNER_INFO_set(si,x509,pkey,dgst)) goto err;
 435         if (!PKCS7_add_signer(p7,si)) goto err;
 436         return(si);
 437 err:
 438         if (si)
 439                 PKCS7_SIGNER_INFO_free(si);
 440         return(NULL);
 441         }
 442
 443 int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
 444         {
 445         if (PKCS7_type_is_digest(p7))
 446                 {
 447                 if(!(p7->d.digest->md->parameter = ASN1_TYPE_new()))
 448                         {
 449                         PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,ERR_R_MALLOC_FAILURE);
 450                         return 0;
 451                         }
 452                 p7->d.digest->md->parameter->type = V_ASN1_NULL;
 453                 p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
 454                 return 1;
 455                 }
 456
 457         PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,PKCS7_R_WRONG_CONTENT_TYPE);
 458         return 1;
 459         }
 460
 461 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
 462         {
 463         if (p7 == NULL || p7->d.ptr == NULL)
 464                 return NULL;
 465         if (PKCS7_type_is_signed(p7))
 466                 {
 467                 return(p7->d.sign->signer_info);
 468                 }
 469         else if (PKCS7_type_is_signedAndEnveloped(p7))
 470                 {
 471                 return(p7->d.signed_and_enveloped->signer_info);
 472                 }
 473         else
 474                 return(NULL);
 475         }
 476
 477 void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
 478                                         X509_ALGOR **pdig, X509_ALGOR **psig)
 479         {
 480         if (pk)
 481                 *pk = si->pkey;
 482         if (pdig)
 483                 *pdig = si->digest_alg;
 484         if (psig)
 485                 *psig = si->digest_enc_alg;
 486         }
 487
 488 void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
 489         {
 490         if (penc)
 491                 *penc = ri->key_enc_algor;
 492         }
 493
 494 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
 495         {
 496         PKCS7_RECIP_INFO *ri;
 497
 498         if ((ri=PKCS7_RECIP_INFO_new()) == NULL) goto err;
 499         if (!PKCS7_RECIP_INFO_set(ri,x509)) goto err;
 500         if (!PKCS7_add_recipient_info(p7,ri)) goto err;
 501         return ri;
 502 err:
 503         if (ri)
 504                 PKCS7_RECIP_INFO_free(ri);
 505         return NULL;
 506         }
 507
 508 int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
 509         {
 510         int i;
 511         STACK_OF(PKCS7_RECIP_INFO) *sk;
 512
 513         i=OBJ_obj2nid(p7->type);
 514         switch (i)
 515                 {
 516         case NID_pkcs7_signedAndEnveloped:
 517                 sk=     p7->d.signed_and_enveloped->recipientinfo;
 518                 break;
 519         case NID_pkcs7_enveloped:
 520                 sk=     p7->d.enveloped->recipientinfo;
 521                 break;
 522         default:
 523                 PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,PKCS7_R_WRONG_CONTENT_TYPE);
 524                 return(0);
 525                 }
 526
 527         if (!sk_PKCS7_RECIP_INFO_push(sk,ri))
 528                 return 0;
 529         return(1);
 530         }
 531
 532 int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
 533         {
 534         int ret;
 535         EVP_PKEY *pkey = NULL;
 536         if (!ASN1_INTEGER_set(p7i->version,0))
 537                 return 0;
 538         if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
 539                 X509_get_issuer_name(x509)))
 540                 return 0;
 541
 542         M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
 543         if (!(p7i->issuer_and_serial->serial=
 544                 M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
 545                 return 0;
 546
 547         pkey = X509_get_pubkey(x509);
 548
 549         if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl)
 550                 {
 551                 PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 552                         PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 553                 goto err;
 554                 }
 555
 556         ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT,
 557                                                 0, p7i);
 558         if (ret == -2)
 559                 {
 560                 PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 561                         PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 562                 goto err;
 563                 }
 564         if (ret <= 0)
 565                 {
 566                 PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 567                                 PKCS7_R_ENCRYPTION_CTRL_FAILURE);
 568                 goto err;
 569                 }
 570
 571         EVP_PKEY_free(pkey);
 572
 573         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 574         p7i->cert=x509;
 575
 576         return 1;
 577
 578         err:
 579         if (pkey)
 580                 EVP_PKEY_free(pkey);
 581         return 0;
 582         }
 583
 584 X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 585         {
 586         if (PKCS7_type_is_signed(p7))
 587                 return(X509_find_by_issuer_and_serial(p7->d.sign->cert,
 588                         si->issuer_and_serial->issuer,
 589                         si->issuer_and_serial->serial));
 590         else
 591                 return(NULL);
 592         }
 593
 594 int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
 595         {
 596         int i;
 597         PKCS7_ENC_CONTENT *ec;
 598
 599         i=OBJ_obj2nid(p7->type);
 600         switch (i)
 601                 {
 602         case NID_pkcs7_signedAndEnveloped:
 603                 ec=p7->d.signed_and_enveloped->enc_data;
 604                 break;
 605         case NID_pkcs7_enveloped:
 606                 ec=p7->d.enveloped->enc_data;
 607                 break;
 608         default:
 609                 PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_WRONG_CONTENT_TYPE);
 610                 return(0);
 611                 }
 612
 613         /* Check cipher OID exists and has data in it*/
 614         i = EVP_CIPHER_type(cipher);
 615         if(i == NID_undef) {
 616                 PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
 617                 return(0);
 618         }
 619
 620         ec->cipher = cipher;
 621         return 1;
 622         }
 623
 624 int PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
 625         {
 626         ASN1_OCTET_STRING *os = NULL;
 627
 628         switch (OBJ_obj2nid(p7->type))
 629                 {
 630                 case NID_pkcs7_data:
 631                 os = p7->d.data;
 632                 break;
 633
 634                 case NID_pkcs7_signedAndEnveloped:
 635                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
 636                 if (os == NULL)
 637                         {
 638                         os=M_ASN1_OCTET_STRING_new();
 639                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
 640                         }
 641                 break;
 642
 643                 case NID_pkcs7_enveloped:
 644                 os = p7->d.enveloped->enc_data->enc_data;
 645                 if (os == NULL)
 646                         {
 647                         os=M_ASN1_OCTET_STRING_new();
 648                         p7->d.enveloped->enc_data->enc_data=os;
 649                         }
 650                 break;
 651
 652                 case NID_pkcs7_signed:
 653                 os=p7->d.sign->contents->d.data;
 654                 break;
 655
 656                 default:
 657                 os = NULL;
 658                 break;
 659                 }
 660
 661         if (os == NULL)
 662                 return 0;
 663
 664         os->flags |= ASN1_STRING_FLAG_NDEF;
 665         *boundary = &os->data;
 666
 667         return 1;
 668         }