crypto/cms/cms_smime.c

   1 /* crypto/cms/cms_smime.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53
  54 #include "cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/x509.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include "cms_lcl.h"
  61
  62 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
  63         {
  64         unsigned char buf[4096];
  65         int r = 0, i;
  66         BIO *tmpout = NULL;
  67
  68         if (out == NULL)
  69                 tmpout = BIO_new(BIO_s_null());
  70         else if (flags & CMS_TEXT)
  71                 tmpout = BIO_new(BIO_s_mem());
  72         else
  73                 tmpout = out;
  74
  75         if(!tmpout)
  76                 {
  77                 CMSerr(CMS_F_CMS_COPY_CONTENT,ERR_R_MALLOC_FAILURE);
  78                 goto err;
  79                 }
  80
  81         /* Read all content through chain to process digest, decrypt etc */
  82         for (;;)
  83         {
  84                 i=BIO_read(in,buf,sizeof(buf));
  85                 if (i <= 0)
  86                         {
  87                         if (BIO_method_type(in) == BIO_TYPE_CIPHER)
  88                                 {
  89                                 if (!BIO_get_cipher_status(in))
  90                                         goto err;
  91                                 }
  92                         break;
  93                         }
  94
  95                 if (tmpout)
  96                         BIO_write(tmpout, buf, i);
  97         }
  98
  99         if(flags & CMS_TEXT)
 100                 {
 101                 if(!SMIME_text(tmpout, out))
 102                         {
 103                         CMSerr(CMS_F_CMS_COPY_CONTENT,CMS_R_SMIME_TEXT_ERROR);
 104                         goto err;
 105                         }
 106                 }
 107
 108         r = 1;
 109
 110         err:
 111         if (tmpout && (tmpout != out))
 112                 BIO_free(tmpout);
 113         return r;
 114
 115         }
 116
 117 static int check_content(CMS_ContentInfo *cms)
 118         {
 119         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 120         if (!pos || !*pos)
 121                 {
 122                 CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
 123                 return 0;
 124                 }
 125         return 1;
 126         }
 127
 128 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 129         {
 130         BIO *cont;
 131         int r;
 132         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
 133                 {
 134                 CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
 135                 return 0;
 136                 }
 137         cont = CMS_dataInit(cms, NULL);
 138         if (!cont)
 139                 return 0;
 140         r = cms_copy_content(out, cont, flags);
 141         BIO_free_all(cont);
 142         return r;
 143         }
 144
 145 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 146         {
 147         CMS_ContentInfo *cms;
 148         cms = cms_Data_create();
 149         if (!cms)
 150                 return NULL;
 151
 152         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 153                 return cms;
 154
 155         CMS_ContentInfo_free(cms);
 156
 157         return NULL;
 158         }
 159
 160 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 161                                                         unsigned int flags)
 162         {
 163         BIO *cont;
 164         int r;
 165         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
 166                 {
 167                 CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
 168                 return 0;
 169                 }
 170
 171         if (!dcont && !check_content(cms))
 172                 return 0;
 173
 174         cont = CMS_dataInit(cms, dcont);
 175         if (!cont)
 176                 return 0;
 177         r = cms_copy_content(out, cont, flags);
 178         if (r)
 179                 r = cms_DigestedData_do_final(cms, cont, 1);
 180         BIO_free_all(cont);
 181         return r;
 182         }
 183
 184 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 185                                         unsigned int flags)
 186         {
 187         CMS_ContentInfo *cms;
 188         if (!md)
 189                 md = EVP_sha1();
 190         cms = cms_DigestedData_create(md);
 191         if (!cms)
 192                 return NULL;
 193
 194         if(!(flags & CMS_DETACHED))
 195                 CMS_set_detached(cms, 0);
 196
 197         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 198                 return cms;
 199
 200         CMS_ContentInfo_free(cms);
 201         return NULL;
 202         }
 203
 204 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 205                                 const unsigned char *key, size_t keylen,
 206                                 BIO *dcont, BIO *out, unsigned int flags)
 207         {
 208         BIO *cont;
 209         int r;
 210         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
 211                 {
 212                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 213                                         CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 214                 return 0;
 215                 }
 216
 217         if (!dcont && !check_content(cms))
 218                 return 0;
 219
 220         if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 221                 return 0;
 222         cont = CMS_dataInit(cms, dcont);
 223         if (!cont)
 224                 return 0;
 225         r = cms_copy_content(out, cont, flags);
 226         BIO_free_all(cont);
 227         return r;
 228         }
 229
 230 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 231                                         const unsigned char *key, size_t keylen,
 232                                         unsigned int flags)
 233         {
 234         CMS_ContentInfo *cms;
 235         if (!cipher)
 236                 {
 237                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
 238                 return NULL;
 239                 }
 240         cms = CMS_ContentInfo_new();
 241         if (!cms)
 242                 return NULL;
 243         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 244                 return NULL;
 245
 246         if(!(flags & CMS_DETACHED))
 247                 CMS_set_detached(cms, 0);
 248
 249         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
 250                 return cms;
 251
 252         CMS_ContentInfo_free(cms);
 253         return NULL;
 254         }
 255
 256 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 257                                         X509_STORE *store,
 258                                         STACK_OF(X509) *certs,
 259                                         STACK_OF(X509_CRL) *crls,
 260                                         unsigned int flags)
 261         {
 262         X509_STORE_CTX ctx;
 263         X509 *signer;
 264         int i, j, r = 0;
 265         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 266         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 267                 {
 268                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 269                                                 CMS_R_STORE_INIT_ERROR);
 270                 goto err;
 271                 }
 272         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 273         if (crls)
 274                 X509_STORE_CTX_set0_crls(&ctx, crls);
 275
 276         i = X509_verify_cert(&ctx);
 277         if (i <= 0)
 278                 {
 279                 j = X509_STORE_CTX_get_error(&ctx);
 280                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 281                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 282                 ERR_add_error_data(2, "Verify error:",
 283                                          X509_verify_cert_error_string(j));
 284                 goto err;
 285                 }
 286         r = 1;
 287         err:
 288         X509_STORE_CTX_cleanup(&ctx);
 289         return r;
 290
 291         }
 292
 293 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 294                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 295         {
 296         CMS_SignerInfo *si;
 297         STACK_OF(CMS_SignerInfo) *sinfos;
 298         STACK_OF(X509) *cms_certs = NULL;
 299         STACK_OF(X509_CRL) *crls = NULL;
 300         X509 *signer;
 301         int i, scount = 0, ret = 0;
 302         BIO *cmsbio = NULL, *tmpin = NULL;
 303
 304         if (!dcont && !check_content(cms))
 305                 return 0;
 306
 307         /* Attempt to find all signer certificates */
 308
 309         sinfos = CMS_get0_SignerInfos(cms);
 310
 311         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 312                 {
 313                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 314                 goto err;
 315                 }
 316
 317         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 318                 {
 319                 si = sk_CMS_SignerInfo_value(sinfos, i);
 320                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 321                 if (signer)
 322                         scount++;
 323                 }
 324
 325         if (scount != sk_CMS_SignerInfo_num(sinfos))
 326                 scount += CMS_set1_signers_certs(cms, certs, flags);
 327
 328         if (scount != sk_CMS_SignerInfo_num(sinfos))
 329                 {
 330                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 331                 goto err;
 332                 }
 333
 334         /* Attempt to verify all signers certs */
 335
 336         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 337                 {
 338                 cms_certs = CMS_get1_certs(cms);
 339                 if (!(flags & CMS_NOCRL))
 340                         crls = CMS_get1_crls(cms);
 341                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 342                         {
 343                         si = sk_CMS_SignerInfo_value(sinfos, i);
 344                         if (!cms_signerinfo_verify_cert(si, store,
 345                                                         cms_certs, crls, flags))
 346                                 goto err;
 347                         }
 348                 }
 349
 350         /* Attempt to verify all SignerInfo signed attribute signatures */
 351
 352         if (!(flags & CMS_NO_ATTR_VERIFY))
 353                 {
 354                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 355                         {
 356                         si = sk_CMS_SignerInfo_value(sinfos, i);
 357                         if (CMS_signed_get_attr_count(si) < 0)
 358                                 continue;
 359                         if (CMS_SignerInfo_verify(si) <= 0)
 360                                 goto err;
 361                         }
 362                 }
 363
 364         /* Performance optimization: if the content is a memory BIO then
 365          * store its contents in a temporary read only memory BIO. This
 366          * avoids potentially large numbers of slow copies of data which will
 367          * occur when reading from a read write memory BIO when signatures
 368          * are calculated.
 369          */
 370
 371         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 372                 {
 373                 char *ptr;
 374                 long len;
 375                 len = BIO_get_mem_data(dcont, &ptr);
 376                 tmpin = BIO_new_mem_buf(ptr, len);
 377                 if (tmpin == NULL)
 378                         {
 379                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 380                         return 0;
 381                         }
 382                 }
 383         else
 384                 tmpin = dcont;
 385
 386
 387         cmsbio=CMS_dataInit(cms, tmpin);
 388         if (!cmsbio)
 389                 goto err;
 390
 391         if (!cms_copy_content(out, cmsbio, flags))
 392                 goto err;
 393
 394         if (!(flags & CMS_NO_CONTENT_VERIFY))
 395                 {
 396                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 397                         {
 398                         si = sk_CMS_SignerInfo_value(sinfos, i);
 399                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 400                                 {
 401                                 CMSerr(CMS_F_CMS_VERIFY,
 402                                         CMS_R_CONTENT_VERIFY_ERROR);
 403                                 goto err;
 404                                 }
 405                         }
 406                 }
 407
 408         ret = 1;
 409
 410         err:
 411
 412         if (dcont && (tmpin == dcont))
 413                 BIO_pop(cmsbio);
 414         BIO_free_all(cmsbio);
 415
 416         if (cms_certs)
 417                 sk_X509_pop_free(cms_certs, X509_free);
 418         if (crls)
 419                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 420
 421         return ret;
 422         }
 423
 424 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
 425                         STACK_OF(X509) *certs,
 426                         X509_STORE *store, unsigned int flags)
 427         {
 428         int r;
 429         flags &= ~(CMS_DETACHED|CMS_TEXT);
 430         r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
 431         if (r <= 0)
 432                 return r;
 433         return cms_Receipt_verify(rcms, ocms);
 434         }
 435
 436 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 437                                                 BIO *data, unsigned int flags)
 438         {
 439         CMS_ContentInfo *cms;
 440         int i;
 441         cms = CMS_ContentInfo_new();
 442         if (!cms)
 443                 goto merr;
 444         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 445                 {
 446                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 447                 goto err;
 448                 }
 449         for (i = 0; i < sk_X509_num(certs); i++)
 450                 {
 451                 X509 *x = sk_X509_value(certs, i);
 452                 if (!CMS_add1_cert(cms, x))
 453                         goto merr;
 454                 }
 455         /* If no signer or certs initialize signedData */
 456         if (!pkey && !i && !CMS_SignedData_init(cms))
 457                 goto merr;
 458
 459         if(!(flags & CMS_DETACHED))
 460                 CMS_set_detached(cms, 0);
 461
 462         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 463                 return cms;
 464         else
 465                 goto err;
 466
 467         merr:
 468         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 469
 470         err:
 471         if (cms)
 472                 CMS_ContentInfo_free(cms);
 473         return NULL;
 474         }
 475
 476 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 477                                         X509 *signcert, EVP_PKEY *pkey,
 478                                         STACK_OF(X509) *certs,
 479                                         unsigned int flags)
 480         {
 481         CMS_SignerInfo *rct_si;
 482         CMS_ContentInfo *cms = NULL;
 483         ASN1_OCTET_STRING **pos, *os;
 484         BIO *rct_cont = NULL;
 485         int r = 0;
 486
 487         flags &= ~(CMS_STREAM|CMS_TEXT);
 488         /* Not really detached but avoids content being allocated */
 489         flags |= CMS_PARTIAL|CMS_BINARY|CMS_DETACHED;
 490         if (!pkey || !signcert)
 491                 {
 492                 CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_NO_KEY_OR_CERT);
 493                 return NULL;
 494                 }
 495
 496         /* Initialize signed data */
 497
 498         cms = CMS_sign(NULL, NULL, certs, NULL, flags);
 499         if (!cms)
 500                 goto err;
 501
 502         /* Set inner content type to signed receipt */
 503         if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 504                 goto err;
 505
 506         rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 507         if (!rct_si)
 508                 {
 509                 CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_ADD_SIGNER_ERROR);
 510                 goto err;
 511                 }
 512
 513         os = cms_encode_Receipt(si);
 514
 515         if (!os)
 516                 goto err;
 517
 518         /* Set content to digest */
 519         rct_cont = BIO_new_mem_buf(os->data, os->length);
 520         if (!rct_cont)
 521                 goto err;
 522
 523         /* Add msgSigDigest attribute */
 524
 525         if (!cms_msgSigDigest_add1(rct_si, si))
 526                 goto err;
 527
 528         /* Finalize structure */
 529         if (!CMS_final(cms, rct_cont, flags))
 530                 goto err;
 531
 532         /* Set embedded content */
 533         pos = CMS_get0_content(cms);
 534         *pos = os;
 535
 536         r = 1;
 537
 538         err:
 539         if (rct_cont)
 540                 BIO_free(rct_cont);
 541         if (r)
 542                 return cms;
 543         CMS_ContentInfo_free(cms);
 544         return NULL;
 545
 546         }
 547
 548 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 549                                 const EVP_CIPHER *cipher, unsigned int flags)
 550         {
 551         CMS_ContentInfo *cms;
 552         int i;
 553         X509 *recip;
 554         cms = CMS_EnvelopedData_create(cipher);
 555         if (!cms)
 556                 goto merr;
 557         for (i = 0; i < sk_X509_num(certs); i++)
 558                 {
 559                 recip = sk_X509_value(certs, i);
 560                 if (!CMS_add1_recipient_cert(cms, recip, flags))
 561                         {
 562                         CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR);
 563                         goto err;
 564                         }
 565                 }
 566
 567         if(!(flags & CMS_DETACHED))
 568                 CMS_set_detached(cms, 0);
 569
 570         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 571                 return cms;
 572         else
 573                 goto err;
 574
 575         merr:
 576         CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE);
 577         err:
 578         if (cms)
 579                 CMS_ContentInfo_free(cms);
 580         return NULL;
 581         }
 582
 583 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 584         {
 585         STACK_OF(CMS_RecipientInfo) *ris;
 586         CMS_RecipientInfo *ri;
 587         int i, r;
 588         ris = CMS_get0_RecipientInfos(cms);
 589         for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
 590                 {
 591                 ri = sk_CMS_RecipientInfo_value(ris, i);
 592                 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
 593                                 continue;
 594                 /* If we have a cert try matching RecipientInfo
 595                  * otherwise try them all.
 596                  */
 597                 if (!cert || (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0))
 598                         {
 599                         CMS_RecipientInfo_set0_pkey(ri, pk);
 600                         r = CMS_RecipientInfo_decrypt(cms, ri);
 601                         CMS_RecipientInfo_set0_pkey(ri, NULL);
 602                         if (r > 0)
 603                                 return 1;
 604                         if (cert)
 605                                 {
 606                                 CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY,
 607                                                 CMS_R_DECRYPT_ERROR);
 608                                 return 0;
 609                                 }
 610                         ERR_clear_error();
 611                         }
 612                 }
 613
 614         CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NO_MATCHING_RECIPIENT);
 615         return 0;
 616
 617         }
 618
 619 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 620                                 unsigned char *key, size_t keylen,
 621                                 unsigned char *id, size_t idlen)
 622         {
 623         STACK_OF(CMS_RecipientInfo) *ris;
 624         CMS_RecipientInfo *ri;
 625         int i, r;
 626         ris = CMS_get0_RecipientInfos(cms);
 627         for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
 628                 {
 629                 ri = sk_CMS_RecipientInfo_value(ris, i);
 630                 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 631                                 continue;
 632
 633                 /* If we have an id try matching RecipientInfo
 634                  * otherwise try them all.
 635                  */
 636                 if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0))
 637                         {
 638                         CMS_RecipientInfo_set0_key(ri, key, keylen);
 639                         r = CMS_RecipientInfo_decrypt(cms, ri);
 640                         CMS_RecipientInfo_set0_key(ri, NULL, 0);
 641                         if (r > 0)
 642                                 return 1;
 643                         if (id)
 644                                 {
 645                                 CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY,
 646                                                 CMS_R_DECRYPT_ERROR);
 647                                 return 0;
 648                                 }
 649                         ERR_clear_error();
 650                         }
 651                 }
 652
 653         CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_NO_MATCHING_RECIPIENT);
 654         return 0;
 655
 656         }
 657
 658 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 659                                 BIO *dcont, BIO *out,
 660                                 unsigned int flags)
 661         {
 662         int r;
 663         BIO *cont;
 664         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
 665                 {
 666                 CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 667                 return 0;
 668                 }
 669         if (!dcont && !check_content(cms))
 670                 return 0;
 671         if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert))
 672                 return 0;
 673
 674         cont = CMS_dataInit(cms, dcont);
 675         if (!cont)
 676                 return 0;
 677         r = cms_copy_content(out, cont, flags);
 678         BIO_free_all(cont);
 679         return r;
 680         }
 681
 682 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
 683         {
 684         BIO *cmsbio;
 685         int ret = 0;
 686         if (!(cmsbio = CMS_dataInit(cms, NULL)))
 687                 {
 688                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 689                 return 0;
 690                 }
 691
 692         SMIME_crlf_copy(data, cmsbio, flags);
 693
 694         (void)BIO_flush(cmsbio);
 695
 696
 697         if (!CMS_dataFinal(cms, cmsbio))
 698                 {
 699                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 700                 goto err;
 701                 }
 702
 703         ret = 1;
 704
 705         err:
 706         BIO_free_all(cmsbio);
 707
 708         return ret;
 709
 710         }
 711
 712 #ifdef ZLIB
 713
 714 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 715                                                         unsigned int flags)
 716         {
 717         BIO *cont;
 718         int r;
 719         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 720                 {
 721                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 722                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 723                 return 0;
 724                 }
 725
 726         if (!dcont && !check_content(cms))
 727                 return 0;
 728
 729         cont = CMS_dataInit(cms, dcont);
 730         if (!cont)
 731                 return 0;
 732         r = cms_copy_content(out, cont, flags);
 733         BIO_free_all(cont);
 734         return r;
 735         }
 736
 737 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 738         {
 739         CMS_ContentInfo *cms;
 740         if (comp_nid <= 0)
 741                 comp_nid = NID_zlib_compression;
 742         cms = cms_CompressedData_create(comp_nid);
 743         if (!cms)
 744                 return NULL;
 745
 746         if(!(flags & CMS_DETACHED))
 747                 CMS_set_detached(cms, 0);
 748
 749         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 750                 return cms;
 751
 752         CMS_ContentInfo_free(cms);
 753         return NULL;
 754         }
 755
 756 #else
 757
 758 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 759                                                         unsigned int flags)
 760         {
 761         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 762         return 0;
 763         }
 764
 765 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 766         {
 767         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 768         return NULL;
 769         }
 770
 771 #endif