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     /* NOTE(emilia): does not support detached digested data. */
  74     case PKCS7_OP_SET_DETACHED_SIGNATURE:
  75         if (nid == NID_pkcs7_signed) {
  76             ret = p7->detached = (int)larg;
  77             if (ret && PKCS7_type_is_data(p7->d.sign->contents)) {
  78                 ASN1_OCTET_STRING *os;
  79                 os = p7->d.sign->contents->d.data;
  80                 ASN1_OCTET_STRING_free(os);
  81                 p7->d.sign->contents->d.data = NULL;
  82             }
  83         } else {
  84             PKCS7err(PKCS7_F_PKCS7_CTRL,
  85                      PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
  86             ret = 0;
  87         }
  88         break;
  89     case PKCS7_OP_GET_DETACHED_SIGNATURE:
  90         if (nid == NID_pkcs7_signed) {
  91             if (!p7->d.sign || !p7->d.sign->contents->d.ptr)
  92                 ret = 1;
  93             else
  94                 ret = 0;
  95
  96             p7->detached = ret;
  97         } else {
  98             PKCS7err(PKCS7_F_PKCS7_CTRL,
  99                      PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
 100             ret = 0;
 101         }
 102
 103         break;
 104     default:
 105         PKCS7err(PKCS7_F_PKCS7_CTRL, PKCS7_R_UNKNOWN_OPERATION);
 106         ret = 0;
 107     }
 108     return (ret);
 109 }
 110
 111 int PKCS7_content_new(PKCS7 *p7, int type)
 112 {
 113     PKCS7 *ret = NULL;
 114
 115     if ((ret = PKCS7_new()) == NULL)
 116         goto err;
 117     if (!PKCS7_set_type(ret, type))
 118         goto err;
 119     if (!PKCS7_set_content(p7, ret))
 120         goto err;
 121
 122     return (1);
 123  err:
 124     if (ret != NULL)
 125         PKCS7_free(ret);
 126     return (0);
 127 }
 128
 129 int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
 130 {
 131     int i;
 132
 133     i = OBJ_obj2nid(p7->type);
 134     switch (i) {
 135     case NID_pkcs7_signed:
 136         if (p7->d.sign->contents != NULL)
 137             PKCS7_free(p7->d.sign->contents);
 138         p7->d.sign->contents = p7_data;
 139         break;
 140     case NID_pkcs7_digest:
 141         if (p7->d.digest->contents != NULL)
 142             PKCS7_free(p7->d.digest->contents);
 143         p7->d.digest->contents = p7_data;
 144         break;
 145     case NID_pkcs7_data:
 146     case NID_pkcs7_enveloped:
 147     case NID_pkcs7_signedAndEnveloped:
 148     case NID_pkcs7_encrypted:
 149     default:
 150         PKCS7err(PKCS7_F_PKCS7_SET_CONTENT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 151         goto err;
 152     }
 153     return (1);
 154  err:
 155     return (0);
 156 }
 157
 158 int PKCS7_set_type(PKCS7 *p7, int type)
 159 {
 160     ASN1_OBJECT *obj;
 161
 162     /*
 163      * PKCS7_content_free(p7);
 164      */
 165     obj = OBJ_nid2obj(type);    /* will not fail */
 166
 167     switch (type) {
 168     case NID_pkcs7_signed:
 169         p7->type = obj;
 170         if ((p7->d.sign = PKCS7_SIGNED_new()) == NULL)
 171             goto err;
 172         if (!ASN1_INTEGER_set(p7->d.sign->version, 1)) {
 173             PKCS7_SIGNED_free(p7->d.sign);
 174             p7->d.sign = NULL;
 175             goto err;
 176         }
 177         break;
 178     case NID_pkcs7_data:
 179         p7->type = obj;
 180         if ((p7->d.data = ASN1_OCTET_STRING_new()) == NULL)
 181             goto err;
 182         break;
 183     case NID_pkcs7_signedAndEnveloped:
 184         p7->type = obj;
 185         if ((p7->d.signed_and_enveloped = PKCS7_SIGN_ENVELOPE_new())
 186             == NULL)
 187             goto err;
 188         ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1);
 189         if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1))
 190             goto err;
 191         p7->d.signed_and_enveloped->enc_data->content_type
 192             = OBJ_nid2obj(NID_pkcs7_data);
 193         break;
 194     case NID_pkcs7_enveloped:
 195         p7->type = obj;
 196         if ((p7->d.enveloped = PKCS7_ENVELOPE_new())
 197             == NULL)
 198             goto err;
 199         if (!ASN1_INTEGER_set(p7->d.enveloped->version, 0))
 200             goto err;
 201         p7->d.enveloped->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
 202         break;
 203     case NID_pkcs7_encrypted:
 204         p7->type = obj;
 205         if ((p7->d.encrypted = PKCS7_ENCRYPT_new())
 206             == NULL)
 207             goto err;
 208         if (!ASN1_INTEGER_set(p7->d.encrypted->version, 0))
 209             goto err;
 210         p7->d.encrypted->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
 211         break;
 212
 213     case NID_pkcs7_digest:
 214         p7->type = obj;
 215         if ((p7->d.digest = PKCS7_DIGEST_new())
 216             == NULL)
 217             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     case NID_pkcs7_signed:
 247         signer_sk = p7->d.sign->signer_info;
 248         md_sk = p7->d.sign->md_algs;
 249         break;
 250     case NID_pkcs7_signedAndEnveloped:
 251         signer_sk = p7->d.signed_and_enveloped->signer_info;
 252         md_sk = p7->d.signed_and_enveloped->md_algs;
 253         break;
 254     default:
 255         PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, PKCS7_R_WRONG_CONTENT_TYPE);
 256         return (0);
 257     }
 258
 259     nid = OBJ_obj2nid(psi->digest_alg->algorithm);
 260
 261     /* If the digest is not currently listed, add it */
 262     j = 0;
 263     for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
 264         alg = sk_X509_ALGOR_value(md_sk, i);
 265         if (OBJ_obj2nid(alg->algorithm) == nid) {
 266             j = 1;
 267             break;
 268         }
 269     }
 270     if (!j) {                   /* we need to add another algorithm */
 271         if (!(alg = X509_ALGOR_new())
 272             || !(alg->parameter = ASN1_TYPE_new())) {
 273             X509_ALGOR_free(alg);
 274             PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
 275             return (0);
 276         }
 277         alg->algorithm = OBJ_nid2obj(nid);
 278         alg->parameter->type = V_ASN1_NULL;
 279         if (!sk_X509_ALGOR_push(md_sk, alg)) {
 280             X509_ALGOR_free(alg);
 281             return 0;
 282         }
 283     }
 284
 285     if (!sk_PKCS7_SIGNER_INFO_push(signer_sk, psi))
 286         return 0;
 287     return (1);
 288 }
 289
 290 int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
 291 {
 292     int i;
 293     STACK_OF(X509) **sk;
 294
 295     i = OBJ_obj2nid(p7->type);
 296     switch (i) {
 297     case NID_pkcs7_signed:
 298         sk = &(p7->d.sign->cert);
 299         break;
 300     case NID_pkcs7_signedAndEnveloped:
 301         sk = &(p7->d.signed_and_enveloped->cert);
 302         break;
 303     default:
 304         PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, PKCS7_R_WRONG_CONTENT_TYPE);
 305         return (0);
 306     }
 307
 308     if (*sk == NULL)
 309         *sk = sk_X509_new_null();
 310     if (*sk == NULL) {
 311         PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);
 312         return 0;
 313     }
 314     CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
 315     if (!sk_X509_push(*sk, x509)) {
 316         X509_free(x509);
 317         return 0;
 318     }
 319     return (1);
 320 }
 321
 322 int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
 323 {
 324     int i;
 325     STACK_OF(X509_CRL) **sk;
 326
 327     i = OBJ_obj2nid(p7->type);
 328     switch (i) {
 329     case NID_pkcs7_signed:
 330         sk = &(p7->d.sign->crl);
 331         break;
 332     case NID_pkcs7_signedAndEnveloped:
 333         sk = &(p7->d.signed_and_enveloped->crl);
 334         break;
 335     default:
 336         PKCS7err(PKCS7_F_PKCS7_ADD_CRL, PKCS7_R_WRONG_CONTENT_TYPE);
 337         return (0);
 338     }
 339
 340     if (*sk == NULL)
 341         *sk = sk_X509_CRL_new_null();
 342     if (*sk == NULL) {
 343         PKCS7err(PKCS7_F_PKCS7_ADD_CRL, ERR_R_MALLOC_FAILURE);
 344         return 0;
 345     }
 346
 347     CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
 348     if (!sk_X509_CRL_push(*sk, crl)) {
 349         X509_CRL_free(crl);
 350         return 0;
 351     }
 352     return (1);
 353 }
 354
 355 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
 356                           const EVP_MD *dgst)
 357 {
 358     int ret;
 359
 360     /* We now need to add another PKCS7_SIGNER_INFO entry */
 361     if (!ASN1_INTEGER_set(p7i->version, 1))
 362         goto err;
 363     if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
 364                        X509_get_issuer_name(x509)))
 365         goto err;
 366
 367     /*
 368      * because ASN1_INTEGER_set is used to set a 'long' we will do things the
 369      * ugly way.
 370      */
 371     ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
 372     if (!(p7i->issuer_and_serial->serial =
 373           ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
 374         goto err;
 375
 376     /* lets keep the pkey around for a while */
 377     CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 378     p7i->pkey = pkey;
 379
 380     /* Set the algorithms */
 381
 382     X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
 383                     V_ASN1_NULL, NULL);
 384
 385     if (pkey->ameth && pkey->ameth->pkey_ctrl) {
 386         ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN, 0, p7i);
 387         if (ret > 0)
 388             return 1;
 389         if (ret != -2) {
 390             PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
 391                      PKCS7_R_SIGNING_CTRL_FAILURE);
 392             return 0;
 393         }
 394     }
 395     PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
 396              PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 397  err:
 398     return 0;
 399 }
 400
 401 PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
 402                                        const EVP_MD *dgst)
 403 {
 404     PKCS7_SIGNER_INFO *si = NULL;
 405
 406     if (dgst == NULL) {
 407         int def_nid;
 408         if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
 409             goto err;
 410         dgst = EVP_get_digestbynid(def_nid);
 411         if (dgst == NULL) {
 412             PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE, PKCS7_R_NO_DEFAULT_DIGEST);
 413             goto err;
 414         }
 415     }
 416
 417     if ((si = PKCS7_SIGNER_INFO_new()) == NULL)
 418         goto err;
 419     if (!PKCS7_SIGNER_INFO_set(si, x509, pkey, dgst))
 420         goto err;
 421     if (!PKCS7_add_signer(p7, si))
 422         goto err;
 423     return (si);
 424  err:
 425     if (si)
 426         PKCS7_SIGNER_INFO_free(si);
 427     return (NULL);
 428 }
 429
 430 int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
 431 {
 432     if (PKCS7_type_is_digest(p7)) {
 433         if (!(p7->d.digest->md->parameter = ASN1_TYPE_new())) {
 434             PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, ERR_R_MALLOC_FAILURE);
 435             return 0;
 436         }
 437         p7->d.digest->md->parameter->type = V_ASN1_NULL;
 438         p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
 439         return 1;
 440     }
 441
 442     PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, PKCS7_R_WRONG_CONTENT_TYPE);
 443     return 1;
 444 }
 445
 446 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
 447 {
 448     if (p7 == NULL || p7->d.ptr == NULL)
 449         return NULL;
 450     if (PKCS7_type_is_signed(p7)) {
 451         return (p7->d.sign->signer_info);
 452     } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
 453         return (p7->d.signed_and_enveloped->signer_info);
 454     } else
 455         return (NULL);
 456 }
 457
 458 void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
 459                                  X509_ALGOR **pdig, X509_ALGOR **psig)
 460 {
 461     if (pk)
 462         *pk = si->pkey;
 463     if (pdig)
 464         *pdig = si->digest_alg;
 465     if (psig)
 466         *psig = si->digest_enc_alg;
 467 }
 468
 469 void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
 470 {
 471     if (penc)
 472         *penc = ri->key_enc_algor;
 473 }
 474
 475 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
 476 {
 477     PKCS7_RECIP_INFO *ri;
 478
 479     if ((ri = PKCS7_RECIP_INFO_new()) == NULL)
 480         goto err;
 481     if (!PKCS7_RECIP_INFO_set(ri, x509))
 482         goto err;
 483     if (!PKCS7_add_recipient_info(p7, ri))
 484         goto err;
 485     return ri;
 486  err:
 487     if (ri)
 488         PKCS7_RECIP_INFO_free(ri);
 489     return NULL;
 490 }
 491
 492 int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
 493 {
 494     int i;
 495     STACK_OF(PKCS7_RECIP_INFO) *sk;
 496
 497     i = OBJ_obj2nid(p7->type);
 498     switch (i) {
 499     case NID_pkcs7_signedAndEnveloped:
 500         sk = p7->d.signed_and_enveloped->recipientinfo;
 501         break;
 502     case NID_pkcs7_enveloped:
 503         sk = p7->d.enveloped->recipientinfo;
 504         break;
 505     default:
 506         PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,
 507                  PKCS7_R_WRONG_CONTENT_TYPE);
 508         return (0);
 509     }
 510
 511     if (!sk_PKCS7_RECIP_INFO_push(sk, ri))
 512         return 0;
 513     return (1);
 514 }
 515
 516 int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
 517 {
 518     int ret;
 519     EVP_PKEY *pkey = NULL;
 520     if (!ASN1_INTEGER_set(p7i->version, 0))
 521         return 0;
 522     if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
 523                        X509_get_issuer_name(x509)))
 524         return 0;
 525
 526     ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
 527     if (!(p7i->issuer_and_serial->serial =
 528           ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
 529         return 0;
 530
 531     pkey = X509_get_pubkey(x509);
 532
 533     if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl) {
 534         PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 535                  PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 536         goto err;
 537     }
 538
 539     ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT, 0, p7i);
 540     if (ret == -2) {
 541         PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 542                  PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 543         goto err;
 544     }
 545     if (ret <= 0) {
 546         PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
 547                  PKCS7_R_ENCRYPTION_CTRL_FAILURE);
 548         goto err;
 549     }
 550
 551     EVP_PKEY_free(pkey);
 552
 553     CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
 554     p7i->cert = x509;
 555
 556     return 1;
 557
 558  err:
 559     if (pkey)
 560         EVP_PKEY_free(pkey);
 561     return 0;
 562 }
 563
 564 X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 565 {
 566     if (PKCS7_type_is_signed(p7))
 567         return (X509_find_by_issuer_and_serial(p7->d.sign->cert,
 568                                                si->issuer_and_serial->issuer,
 569                                                si->
 570                                                issuer_and_serial->serial));
 571     else
 572         return (NULL);
 573 }
 574
 575 int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
 576 {
 577     int i;
 578     PKCS7_ENC_CONTENT *ec;
 579
 580     i = OBJ_obj2nid(p7->type);
 581     switch (i) {
 582     case NID_pkcs7_signedAndEnveloped:
 583         ec = p7->d.signed_and_enveloped->enc_data;
 584         break;
 585     case NID_pkcs7_enveloped:
 586         ec = p7->d.enveloped->enc_data;
 587         break;
 588     default:
 589         PKCS7err(PKCS7_F_PKCS7_SET_CIPHER, PKCS7_R_WRONG_CONTENT_TYPE);
 590         return (0);
 591     }
 592
 593     /* Check cipher OID exists and has data in it */
 594     i = EVP_CIPHER_type(cipher);
 595     if (i == NID_undef) {
 596         PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,
 597                  PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
 598         return (0);
 599     }
 600
 601     ec->cipher = cipher;
 602     return 1;
 603 }
 604
 605 int PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
 606 {
 607     ASN1_OCTET_STRING *os = NULL;
 608
 609     switch (OBJ_obj2nid(p7->type)) {
 610     case NID_pkcs7_data:
 611         os = p7->d.data;
 612         break;
 613
 614     case NID_pkcs7_signedAndEnveloped:
 615         os = p7->d.signed_and_enveloped->enc_data->enc_data;
 616         if (os == NULL) {
 617             os = ASN1_OCTET_STRING_new();
 618             p7->d.signed_and_enveloped->enc_data->enc_data = os;
 619         }
 620         break;
 621
 622     case NID_pkcs7_enveloped:
 623         os = p7->d.enveloped->enc_data->enc_data;
 624         if (os == NULL) {
 625             os = ASN1_OCTET_STRING_new();
 626             p7->d.enveloped->enc_data->enc_data = os;
 627         }
 628         break;
 629
 630     case NID_pkcs7_signed:
 631         os = p7->d.sign->contents->d.data;
 632         break;
 633
 634     default:
 635         os = NULL;
 636         break;
 637     }
 638
 639     if (os == NULL)
 640         return 0;
 641
 642     os->flags |= ASN1_STRING_FLAG_NDEF;
 643     *boundary = &os->data;
 644
 645     return 1;
 646 }