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 static void do_free_upto(BIO *f, BIO *upto)
 129         {
 130         if (upto)
 131                 {
 132                 BIO *tbio;
 133                 do
 134                         {
 135                         tbio = BIO_pop(f);
 136                         BIO_free(f);
 137                         f = tbio;
 138                         }
 139                 while (f != upto);
 140                 }
 141         else
 142                 BIO_free_all(f);
 143         }
 144
 145 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 146         {
 147         BIO *cont;
 148         int r;
 149         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
 150                 {
 151                 CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
 152                 return 0;
 153                 }
 154         cont = CMS_dataInit(cms, NULL);
 155         if (!cont)
 156                 return 0;
 157         r = cms_copy_content(out, cont, flags);
 158         BIO_free_all(cont);
 159         return r;
 160         }
 161
 162 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 163         {
 164         CMS_ContentInfo *cms;
 165         cms = cms_Data_create();
 166         if (!cms)
 167                 return NULL;
 168
 169         if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 170                 return cms;
 171
 172         CMS_ContentInfo_free(cms);
 173
 174         return NULL;
 175         }
 176
 177 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 178                                                         unsigned int flags)
 179         {
 180         BIO *cont;
 181         int r;
 182         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
 183                 {
 184                 CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
 185                 return 0;
 186                 }
 187
 188         if (!dcont && !check_content(cms))
 189                 return 0;
 190
 191         cont = CMS_dataInit(cms, dcont);
 192         if (!cont)
 193                 return 0;
 194         r = cms_copy_content(out, cont, flags);
 195         if (r)
 196                 r = cms_DigestedData_do_final(cms, cont, 1);
 197         do_free_upto(cont, dcont);
 198         return r;
 199         }
 200
 201 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 202                                         unsigned int flags)
 203         {
 204         CMS_ContentInfo *cms;
 205         if (!md)
 206                 md = EVP_sha1();
 207         cms = cms_DigestedData_create(md);
 208         if (!cms)
 209                 return NULL;
 210
 211         if(!(flags & CMS_DETACHED))
 212                 CMS_set_detached(cms, 0);
 213
 214         if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 215                 return cms;
 216
 217         CMS_ContentInfo_free(cms);
 218         return NULL;
 219         }
 220
 221 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 222                                 const unsigned char *key, size_t keylen,
 223                                 BIO *dcont, BIO *out, unsigned int flags)
 224         {
 225         BIO *cont;
 226         int r;
 227         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
 228                 {
 229                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 230                                         CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 231                 return 0;
 232                 }
 233
 234         if (!dcont && !check_content(cms))
 235                 return 0;
 236
 237         if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 238                 return 0;
 239         cont = CMS_dataInit(cms, dcont);
 240         if (!cont)
 241                 return 0;
 242         r = cms_copy_content(out, cont, flags);
 243         do_free_upto(cont, dcont);
 244         return r;
 245         }
 246
 247 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 248                                         const unsigned char *key, size_t keylen,
 249                                         unsigned int flags)
 250         {
 251         CMS_ContentInfo *cms;
 252         if (!cipher)
 253                 {
 254                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
 255                 return NULL;
 256                 }
 257         cms = CMS_ContentInfo_new();
 258         if (!cms)
 259                 return NULL;
 260         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 261                 return NULL;
 262
 263         if(!(flags & CMS_DETACHED))
 264                 CMS_set_detached(cms, 0);
 265
 266         if ((flags & (CMS_STREAM|CMS_PARTIAL))
 267                 || CMS_final(cms, in, NULL, flags))
 268                 return cms;
 269
 270         CMS_ContentInfo_free(cms);
 271         return NULL;
 272         }
 273
 274 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 275                                         X509_STORE *store,
 276                                         STACK_OF(X509) *certs,
 277                                         STACK_OF(X509_CRL) *crls,
 278                                         unsigned int flags)
 279         {
 280         X509_STORE_CTX ctx;
 281         X509 *signer;
 282         int i, j, r = 0;
 283         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 284         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 285                 {
 286                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 287                                                 CMS_R_STORE_INIT_ERROR);
 288                 goto err;
 289                 }
 290         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 291         if (crls)
 292                 X509_STORE_CTX_set0_crls(&ctx, crls);
 293
 294         i = X509_verify_cert(&ctx);
 295         if (i <= 0)
 296                 {
 297                 j = X509_STORE_CTX_get_error(&ctx);
 298                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 299                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 300                 ERR_add_error_data(2, "Verify error:",
 301                                          X509_verify_cert_error_string(j));
 302                 goto err;
 303                 }
 304         r = 1;
 305         err:
 306         X509_STORE_CTX_cleanup(&ctx);
 307         return r;
 308
 309         }
 310
 311 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 312                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 313         {
 314         CMS_SignerInfo *si;
 315         STACK_OF(CMS_SignerInfo) *sinfos;
 316         STACK_OF(X509) *cms_certs = NULL;
 317         STACK_OF(X509_CRL) *crls = NULL;
 318         X509 *signer;
 319         int i, scount = 0, ret = 0;
 320         BIO *cmsbio = NULL, *tmpin = NULL;
 321
 322         if (!dcont && !check_content(cms))
 323                 return 0;
 324
 325         /* Attempt to find all signer certificates */
 326
 327         sinfos = CMS_get0_SignerInfos(cms);
 328
 329         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 330                 {
 331                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 332                 goto err;
 333                 }
 334
 335         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 336                 {
 337                 si = sk_CMS_SignerInfo_value(sinfos, i);
 338                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 339                 if (signer)
 340                         scount++;
 341                 }
 342
 343         if (scount != sk_CMS_SignerInfo_num(sinfos))
 344                 scount += CMS_set1_signers_certs(cms, certs, flags);
 345
 346         if (scount != sk_CMS_SignerInfo_num(sinfos))
 347                 {
 348                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 349                 goto err;
 350                 }
 351
 352         /* Attempt to verify all signers certs */
 353
 354         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 355                 {
 356                 cms_certs = CMS_get1_certs(cms);
 357                 if (!(flags & CMS_NOCRL))
 358                         crls = CMS_get1_crls(cms);
 359                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 360                         {
 361                         si = sk_CMS_SignerInfo_value(sinfos, i);
 362                         if (!cms_signerinfo_verify_cert(si, store,
 363                                                         cms_certs, crls, flags))
 364                                 goto err;
 365                         }
 366                 }
 367
 368         /* Attempt to verify all SignerInfo signed attribute signatures */
 369
 370         if (!(flags & CMS_NO_ATTR_VERIFY))
 371                 {
 372                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 373                         {
 374                         si = sk_CMS_SignerInfo_value(sinfos, i);
 375                         if (CMS_signed_get_attr_count(si) < 0)
 376                                 continue;
 377                         if (CMS_SignerInfo_verify(si) <= 0)
 378                                 goto err;
 379                         }
 380                 }
 381
 382         /* Performance optimization: if the content is a memory BIO then
 383          * store its contents in a temporary read only memory BIO. This
 384          * avoids potentially large numbers of slow copies of data which will
 385          * occur when reading from a read write memory BIO when signatures
 386          * are calculated.
 387          */
 388
 389         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 390                 {
 391                 char *ptr;
 392                 long len;
 393                 len = BIO_get_mem_data(dcont, &ptr);
 394                 tmpin = BIO_new_mem_buf(ptr, len);
 395                 if (tmpin == NULL)
 396                         {
 397                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 398                         return 0;
 399                         }
 400                 }
 401         else
 402                 tmpin = dcont;
 403
 404
 405         cmsbio=CMS_dataInit(cms, tmpin);
 406         if (!cmsbio)
 407                 goto err;
 408
 409         if (!cms_copy_content(out, cmsbio, flags))
 410                 goto err;
 411
 412         if (!(flags & CMS_NO_CONTENT_VERIFY))
 413                 {
 414                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 415                         {
 416                         si = sk_CMS_SignerInfo_value(sinfos, i);
 417                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 418                                 {
 419                                 CMSerr(CMS_F_CMS_VERIFY,
 420                                         CMS_R_CONTENT_VERIFY_ERROR);
 421                                 goto err;
 422                                 }
 423                         }
 424                 }
 425
 426         ret = 1;
 427
 428         err:
 429
 430         if (dcont && (tmpin == dcont))
 431                 do_free_upto(cmsbio, dcont);
 432         else
 433                 BIO_free_all(cmsbio);
 434
 435         if (cms_certs)
 436                 sk_X509_pop_free(cms_certs, X509_free);
 437         if (crls)
 438                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 439
 440         return ret;
 441         }
 442
 443 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
 444                         STACK_OF(X509) *certs,
 445                         X509_STORE *store, unsigned int flags)
 446         {
 447         int r;
 448         flags &= ~(CMS_DETACHED|CMS_TEXT);
 449         r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
 450         if (r <= 0)
 451                 return r;
 452         return cms_Receipt_verify(rcms, ocms);
 453         }
 454
 455 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 456                                                 BIO *data, unsigned int flags)
 457         {
 458         CMS_ContentInfo *cms;
 459         int i;
 460
 461         cms = CMS_ContentInfo_new();
 462         if (!cms || !CMS_SignedData_init(cms))
 463                 goto merr;
 464
 465         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 466                 {
 467                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 468                 goto err;
 469                 }
 470
 471         for (i = 0; i < sk_X509_num(certs); i++)
 472                 {
 473                 X509 *x = sk_X509_value(certs, i);
 474                 if (!CMS_add1_cert(cms, x))
 475                         goto merr;
 476                 }
 477
 478         if(!(flags & CMS_DETACHED))
 479                 CMS_set_detached(cms, 0);
 480
 481         if ((flags & (CMS_STREAM|CMS_PARTIAL))
 482                 || CMS_final(cms, data, NULL, flags))
 483                 return cms;
 484         else
 485                 goto err;
 486
 487         merr:
 488         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 489
 490         err:
 491         if (cms)
 492                 CMS_ContentInfo_free(cms);
 493         return NULL;
 494         }
 495
 496 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 497                                         X509 *signcert, EVP_PKEY *pkey,
 498                                         STACK_OF(X509) *certs,
 499                                         unsigned int flags)
 500         {
 501         CMS_SignerInfo *rct_si;
 502         CMS_ContentInfo *cms = NULL;
 503         ASN1_OCTET_STRING **pos, *os;
 504         BIO *rct_cont = NULL;
 505         int r = 0;
 506
 507         flags &= ~(CMS_STREAM|CMS_TEXT);
 508         /* Not really detached but avoids content being allocated */
 509         flags |= CMS_PARTIAL|CMS_BINARY|CMS_DETACHED;
 510         if (!pkey || !signcert)
 511                 {
 512                 CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_NO_KEY_OR_CERT);
 513                 return NULL;
 514                 }
 515
 516         /* Initialize signed data */
 517
 518         cms = CMS_sign(NULL, NULL, certs, NULL, flags);
 519         if (!cms)
 520                 goto err;
 521
 522         /* Set inner content type to signed receipt */
 523         if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 524                 goto err;
 525
 526         rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 527         if (!rct_si)
 528                 {
 529                 CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_ADD_SIGNER_ERROR);
 530                 goto err;
 531                 }
 532
 533         os = cms_encode_Receipt(si);
 534
 535         if (!os)
 536                 goto err;
 537
 538         /* Set content to digest */
 539         rct_cont = BIO_new_mem_buf(os->data, os->length);
 540         if (!rct_cont)
 541                 goto err;
 542
 543         /* Add msgSigDigest attribute */
 544
 545         if (!cms_msgSigDigest_add1(rct_si, si))
 546                 goto err;
 547
 548         /* Finalize structure */
 549         if (!CMS_final(cms, rct_cont, NULL, flags))
 550                 goto err;
 551
 552         /* Set embedded content */
 553         pos = CMS_get0_content(cms);
 554         *pos = os;
 555
 556         r = 1;
 557
 558         err:
 559         if (rct_cont)
 560                 BIO_free(rct_cont);
 561         if (r)
 562                 return cms;
 563         CMS_ContentInfo_free(cms);
 564         return NULL;
 565
 566         }
 567
 568 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 569                                 const EVP_CIPHER *cipher, unsigned int flags)
 570         {
 571         CMS_ContentInfo *cms;
 572         int i;
 573         X509 *recip;
 574         cms = CMS_EnvelopedData_create(cipher);
 575         if (!cms)
 576                 goto merr;
 577         for (i = 0; i < sk_X509_num(certs); i++)
 578                 {
 579                 recip = sk_X509_value(certs, i);
 580                 if (!CMS_add1_recipient_cert(cms, recip, flags))
 581                         {
 582                         CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR);
 583                         goto err;
 584                         }
 585                 }
 586
 587         if(!(flags & CMS_DETACHED))
 588                 CMS_set_detached(cms, 0);
 589
 590         if ((flags & (CMS_STREAM|CMS_PARTIAL))
 591                 || CMS_final(cms, data, NULL, flags))
 592                 return cms;
 593         else
 594                 goto err;
 595
 596         merr:
 597         CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE);
 598         err:
 599         if (cms)
 600                 CMS_ContentInfo_free(cms);
 601         return NULL;
 602         }
 603
 604 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 605         {
 606         STACK_OF(CMS_RecipientInfo) *ris;
 607         CMS_RecipientInfo *ri;
 608         int i, r;
 609         ris = CMS_get0_RecipientInfos(cms);
 610         for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
 611                 {
 612                 ri = sk_CMS_RecipientInfo_value(ris, i);
 613                 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
 614                                 continue;
 615                 /* If we have a cert try matching RecipientInfo
 616                  * otherwise try them all.
 617                  */
 618                 if (!cert || (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0))
 619                         {
 620                         CMS_RecipientInfo_set0_pkey(ri, pk);
 621                         r = CMS_RecipientInfo_decrypt(cms, ri);
 622                         CMS_RecipientInfo_set0_pkey(ri, NULL);
 623                         if (r > 0)
 624                                 return 1;
 625                         if (cert)
 626                                 {
 627                                 CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY,
 628                                                 CMS_R_DECRYPT_ERROR);
 629                                 return 0;
 630                                 }
 631                         ERR_clear_error();
 632                         }
 633                 }
 634
 635         CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NO_MATCHING_RECIPIENT);
 636         return 0;
 637
 638         }
 639
 640 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 641                                 unsigned char *key, size_t keylen,
 642                                 unsigned char *id, size_t idlen)
 643         {
 644         STACK_OF(CMS_RecipientInfo) *ris;
 645         CMS_RecipientInfo *ri;
 646         int i, r;
 647         ris = CMS_get0_RecipientInfos(cms);
 648         for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
 649                 {
 650                 ri = sk_CMS_RecipientInfo_value(ris, i);
 651                 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 652                                 continue;
 653
 654                 /* If we have an id try matching RecipientInfo
 655                  * otherwise try them all.
 656                  */
 657                 if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0))
 658                         {
 659                         CMS_RecipientInfo_set0_key(ri, key, keylen);
 660                         r = CMS_RecipientInfo_decrypt(cms, ri);
 661                         CMS_RecipientInfo_set0_key(ri, NULL, 0);
 662                         if (r > 0)
 663                                 return 1;
 664                         if (id)
 665                                 {
 666                                 CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY,
 667                                                 CMS_R_DECRYPT_ERROR);
 668                                 return 0;
 669                                 }
 670                         ERR_clear_error();
 671                         }
 672                 }
 673
 674         CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_NO_MATCHING_RECIPIENT);
 675         return 0;
 676
 677         }
 678
 679 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 680                                 BIO *dcont, BIO *out,
 681                                 unsigned int flags)
 682         {
 683         int r;
 684         BIO *cont;
 685         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
 686                 {
 687                 CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 688                 return 0;
 689                 }
 690         if (!dcont && !check_content(cms))
 691                 return 0;
 692         if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert))
 693                 return 0;
 694
 695         cont = CMS_dataInit(cms, dcont);
 696         if (!cont)
 697                 return 0;
 698         r = cms_copy_content(out, cont, flags);
 699         do_free_upto(cont, dcont);
 700         return r;
 701         }
 702
 703 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
 704         {
 705         BIO *cmsbio;
 706         int ret = 0;
 707         if (!(cmsbio = CMS_dataInit(cms, dcont)))
 708                 {
 709                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 710                 return 0;
 711                 }
 712
 713         SMIME_crlf_copy(data, cmsbio, flags);
 714
 715         (void)BIO_flush(cmsbio);
 716
 717
 718         if (!CMS_dataFinal(cms, cmsbio))
 719                 {
 720                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 721                 goto err;
 722                 }
 723
 724         ret = 1;
 725
 726         err:
 727         do_free_upto(cmsbio, dcont);
 728
 729         return ret;
 730
 731         }
 732
 733 #ifdef ZLIB
 734
 735 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 736                                                         unsigned int flags)
 737         {
 738         BIO *cont;
 739         int r;
 740         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 741                 {
 742                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 743                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 744                 return 0;
 745                 }
 746
 747         if (!dcont && !check_content(cms))
 748                 return 0;
 749
 750         cont = CMS_dataInit(cms, dcont);
 751         if (!cont)
 752                 return 0;
 753         r = cms_copy_content(out, cont, flags);
 754         do_free_upto(cont, dcont);
 755         return r;
 756         }
 757
 758 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 759         {
 760         CMS_ContentInfo *cms;
 761         if (comp_nid <= 0)
 762                 comp_nid = NID_zlib_compression;
 763         cms = cms_CompressedData_create(comp_nid);
 764         if (!cms)
 765                 return NULL;
 766
 767         if(!(flags & CMS_DETACHED))
 768                 CMS_set_detached(cms, 0);
 769
 770         if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 771                 return cms;
 772
 773         CMS_ContentInfo_free(cms);
 774         return NULL;
 775         }
 776
 777 #else
 778
 779 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 780                                                         unsigned int flags)
 781         {
 782         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 783         return 0;
 784         }
 785
 786 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 787         {
 788         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 789         return NULL;
 790         }
 791
 792 #endif