1 /* crypto/cms/cms_smime.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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>
62 static int cms_copy_content(BIO
*out
, BIO
*in
, unsigned int flags
)
64 unsigned char buf
[4096];
69 tmpout
= BIO_new(BIO_s_null());
70 else if (flags
& CMS_TEXT
)
72 tmpout
= BIO_new(BIO_s_mem());
73 BIO_set_mem_eof_return(tmpout
, 0);
80 CMSerr(CMS_F_CMS_COPY_CONTENT
,ERR_R_MALLOC_FAILURE
);
84 /* Read all content through chain to process digest, decrypt etc */
87 i
=BIO_read(in
,buf
,sizeof(buf
));
90 if (BIO_method_type(in
) == BIO_TYPE_CIPHER
)
92 if (!BIO_get_cipher_status(in
))
100 if (tmpout
&& (BIO_write(tmpout
, buf
, i
) != i
))
106 if(!SMIME_text(tmpout
, out
))
108 CMSerr(CMS_F_CMS_COPY_CONTENT
,CMS_R_SMIME_TEXT_ERROR
);
116 if (tmpout
&& (tmpout
!= out
))
122 static int check_content(CMS_ContentInfo
*cms
)
124 ASN1_OCTET_STRING
**pos
= CMS_get0_content(cms
);
127 CMSerr(CMS_F_CHECK_CONTENT
, CMS_R_NO_CONTENT
);
133 static void do_free_upto(BIO
*f
, BIO
*upto
)
150 int CMS_data(CMS_ContentInfo
*cms
, BIO
*out
, unsigned int flags
)
154 if (OBJ_obj2nid(CMS_get0_type(cms
)) != NID_pkcs7_data
)
156 CMSerr(CMS_F_CMS_DATA
, CMS_R_TYPE_NOT_DATA
);
159 cont
= CMS_dataInit(cms
, NULL
);
162 r
= cms_copy_content(out
, cont
, flags
);
167 CMS_ContentInfo
*CMS_data_create(BIO
*in
, unsigned int flags
)
169 CMS_ContentInfo
*cms
;
170 cms
= cms_Data_create();
174 if ((flags
& CMS_STREAM
) || CMS_final(cms
, in
, NULL
, flags
))
177 CMS_ContentInfo_free(cms
);
182 int CMS_digest_verify(CMS_ContentInfo
*cms
, BIO
*dcont
, BIO
*out
,
187 if (OBJ_obj2nid(CMS_get0_type(cms
)) != NID_pkcs7_digest
)
189 CMSerr(CMS_F_CMS_DIGEST_VERIFY
, CMS_R_TYPE_NOT_DIGESTED_DATA
);
193 if (!dcont
&& !check_content(cms
))
196 cont
= CMS_dataInit(cms
, dcont
);
199 r
= cms_copy_content(out
, cont
, flags
);
201 r
= cms_DigestedData_do_final(cms
, cont
, 1);
202 do_free_upto(cont
, dcont
);
206 CMS_ContentInfo
*CMS_digest_create(BIO
*in
, const EVP_MD
*md
,
209 CMS_ContentInfo
*cms
;
212 cms
= cms_DigestedData_create(md
);
216 if(!(flags
& CMS_DETACHED
))
217 CMS_set_detached(cms
, 0);
219 if ((flags
& CMS_STREAM
) || CMS_final(cms
, in
, NULL
, flags
))
222 CMS_ContentInfo_free(cms
);
226 int CMS_EncryptedData_decrypt(CMS_ContentInfo
*cms
,
227 const unsigned char *key
, size_t keylen
,
228 BIO
*dcont
, BIO
*out
, unsigned int flags
)
232 if (OBJ_obj2nid(CMS_get0_type(cms
)) != NID_pkcs7_encrypted
)
234 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT
,
235 CMS_R_TYPE_NOT_ENCRYPTED_DATA
);
239 if (!dcont
&& !check_content(cms
))
242 if (CMS_EncryptedData_set1_key(cms
, NULL
, key
, keylen
) <= 0)
244 cont
= CMS_dataInit(cms
, dcont
);
247 r
= cms_copy_content(out
, cont
, flags
);
248 do_free_upto(cont
, dcont
);
252 CMS_ContentInfo
*CMS_EncryptedData_encrypt(BIO
*in
, const EVP_CIPHER
*cipher
,
253 const unsigned char *key
, size_t keylen
,
256 CMS_ContentInfo
*cms
;
259 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT
, CMS_R_NO_CIPHER
);
262 cms
= CMS_ContentInfo_new();
265 if (!CMS_EncryptedData_set1_key(cms
, cipher
, key
, keylen
))
268 if(!(flags
& CMS_DETACHED
))
269 CMS_set_detached(cms
, 0);
271 if ((flags
& (CMS_STREAM
|CMS_PARTIAL
))
272 || CMS_final(cms
, in
, NULL
, flags
))
275 CMS_ContentInfo_free(cms
);
279 static int cms_signerinfo_verify_cert(CMS_SignerInfo
*si
,
281 STACK_OF(X509
) *certs
,
282 STACK_OF(X509_CRL
) *crls
,
288 CMS_SignerInfo_get0_algs(si
, NULL
, &signer
, NULL
, NULL
);
289 if (!X509_STORE_CTX_init(&ctx
, store
, signer
, certs
))
291 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT
,
292 CMS_R_STORE_INIT_ERROR
);
295 X509_STORE_CTX_set_default(&ctx
, "smime_sign");
297 X509_STORE_CTX_set0_crls(&ctx
, crls
);
299 i
= X509_verify_cert(&ctx
);
302 j
= X509_STORE_CTX_get_error(&ctx
);
303 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT
,
304 CMS_R_CERTIFICATE_VERIFY_ERROR
);
305 ERR_add_error_data(2, "Verify error:",
306 X509_verify_cert_error_string(j
));
311 X509_STORE_CTX_cleanup(&ctx
);
316 int CMS_verify(CMS_ContentInfo
*cms
, STACK_OF(X509
) *certs
,
317 X509_STORE
*store
, BIO
*dcont
, BIO
*out
, unsigned int flags
)
320 STACK_OF(CMS_SignerInfo
) *sinfos
;
321 STACK_OF(X509
) *cms_certs
= NULL
;
322 STACK_OF(X509_CRL
) *crls
= NULL
;
324 int i
, scount
= 0, ret
= 0;
325 BIO
*cmsbio
= NULL
, *tmpin
= NULL
;
327 if (!dcont
&& !check_content(cms
))
330 /* Attempt to find all signer certificates */
332 sinfos
= CMS_get0_SignerInfos(cms
);
334 if (sk_CMS_SignerInfo_num(sinfos
) <= 0)
336 CMSerr(CMS_F_CMS_VERIFY
, CMS_R_NO_SIGNERS
);
340 for (i
= 0; i
< sk_CMS_SignerInfo_num(sinfos
); i
++)
342 si
= sk_CMS_SignerInfo_value(sinfos
, i
);
343 CMS_SignerInfo_get0_algs(si
, NULL
, &signer
, NULL
, NULL
);
348 if (scount
!= sk_CMS_SignerInfo_num(sinfos
))
349 scount
+= CMS_set1_signers_certs(cms
, certs
, flags
);
351 if (scount
!= sk_CMS_SignerInfo_num(sinfos
))
353 CMSerr(CMS_F_CMS_VERIFY
, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND
);
357 /* Attempt to verify all signers certs */
359 if (!(flags
& CMS_NO_SIGNER_CERT_VERIFY
))
361 cms_certs
= CMS_get1_certs(cms
);
362 if (!(flags
& CMS_NOCRL
))
363 crls
= CMS_get1_crls(cms
);
364 for (i
= 0; i
< sk_CMS_SignerInfo_num(sinfos
); i
++)
366 si
= sk_CMS_SignerInfo_value(sinfos
, i
);
367 if (!cms_signerinfo_verify_cert(si
, store
,
368 cms_certs
, crls
, flags
))
373 /* Attempt to verify all SignerInfo signed attribute signatures */
375 if (!(flags
& CMS_NO_ATTR_VERIFY
))
377 for (i
= 0; i
< sk_CMS_SignerInfo_num(sinfos
); i
++)
379 si
= sk_CMS_SignerInfo_value(sinfos
, i
);
380 if (CMS_signed_get_attr_count(si
) < 0)
382 if (CMS_SignerInfo_verify(si
) <= 0)
387 /* Performance optimization: if the content is a memory BIO then
388 * store its contents in a temporary read only memory BIO. This
389 * avoids potentially large numbers of slow copies of data which will
390 * occur when reading from a read write memory BIO when signatures
394 if (dcont
&& (BIO_method_type(dcont
) == BIO_TYPE_MEM
))
398 len
= BIO_get_mem_data(dcont
, &ptr
);
399 tmpin
= BIO_new_mem_buf(ptr
, len
);
402 CMSerr(CMS_F_CMS_VERIFY
,ERR_R_MALLOC_FAILURE
);
410 cmsbio
=CMS_dataInit(cms
, tmpin
);
414 if (!cms_copy_content(out
, cmsbio
, flags
))
417 if (!(flags
& CMS_NO_CONTENT_VERIFY
))
419 for (i
= 0; i
< sk_CMS_SignerInfo_num(sinfos
); i
++)
421 si
= sk_CMS_SignerInfo_value(sinfos
, i
);
422 if (CMS_SignerInfo_verify_content(si
, cmsbio
) <= 0)
424 CMSerr(CMS_F_CMS_VERIFY
,
425 CMS_R_CONTENT_VERIFY_ERROR
);
435 if (dcont
&& (tmpin
== dcont
))
436 do_free_upto(cmsbio
, dcont
);
438 BIO_free_all(cmsbio
);
441 sk_X509_pop_free(cms_certs
, X509_free
);
443 sk_X509_CRL_pop_free(crls
, X509_CRL_free
);
448 int CMS_verify_receipt(CMS_ContentInfo
*rcms
, CMS_ContentInfo
*ocms
,
449 STACK_OF(X509
) *certs
,
450 X509_STORE
*store
, unsigned int flags
)
453 flags
&= ~(CMS_DETACHED
|CMS_TEXT
);
454 r
= CMS_verify(rcms
, certs
, store
, NULL
, NULL
, flags
);
457 return cms_Receipt_verify(rcms
, ocms
);
460 CMS_ContentInfo
*CMS_sign(X509
*signcert
, EVP_PKEY
*pkey
, STACK_OF(X509
) *certs
,
461 BIO
*data
, unsigned int flags
)
463 CMS_ContentInfo
*cms
;
466 cms
= CMS_ContentInfo_new();
467 if (!cms
|| !CMS_SignedData_init(cms
))
470 if (pkey
&& !CMS_add1_signer(cms
, signcert
, pkey
, NULL
, flags
))
472 CMSerr(CMS_F_CMS_SIGN
, CMS_R_ADD_SIGNER_ERROR
);
476 for (i
= 0; i
< sk_X509_num(certs
); i
++)
478 X509
*x
= sk_X509_value(certs
, i
);
479 if (!CMS_add1_cert(cms
, x
))
483 if(!(flags
& CMS_DETACHED
))
484 CMS_set_detached(cms
, 0);
486 if ((flags
& (CMS_STREAM
|CMS_PARTIAL
))
487 || CMS_final(cms
, data
, NULL
, flags
))
493 CMSerr(CMS_F_CMS_SIGN
, ERR_R_MALLOC_FAILURE
);
497 CMS_ContentInfo_free(cms
);
501 CMS_ContentInfo
*CMS_sign_receipt(CMS_SignerInfo
*si
,
502 X509
*signcert
, EVP_PKEY
*pkey
,
503 STACK_OF(X509
) *certs
,
506 CMS_SignerInfo
*rct_si
;
507 CMS_ContentInfo
*cms
= NULL
;
508 ASN1_OCTET_STRING
**pos
, *os
;
509 BIO
*rct_cont
= NULL
;
512 flags
&= ~(CMS_STREAM
|CMS_TEXT
);
513 /* Not really detached but avoids content being allocated */
514 flags
|= CMS_PARTIAL
|CMS_BINARY
|CMS_DETACHED
;
515 if (!pkey
|| !signcert
)
517 CMSerr(CMS_F_CMS_SIGN_RECEIPT
, CMS_R_NO_KEY_OR_CERT
);
521 /* Initialize signed data */
523 cms
= CMS_sign(NULL
, NULL
, certs
, NULL
, flags
);
527 /* Set inner content type to signed receipt */
528 if (!CMS_set1_eContentType(cms
, OBJ_nid2obj(NID_id_smime_ct_receipt
)))
531 rct_si
= CMS_add1_signer(cms
, signcert
, pkey
, NULL
, flags
);
534 CMSerr(CMS_F_CMS_SIGN_RECEIPT
, CMS_R_ADD_SIGNER_ERROR
);
538 os
= cms_encode_Receipt(si
);
543 /* Set content to digest */
544 rct_cont
= BIO_new_mem_buf(os
->data
, os
->length
);
548 /* Add msgSigDigest attribute */
550 if (!cms_msgSigDigest_add1(rct_si
, si
))
553 /* Finalize structure */
554 if (!CMS_final(cms
, rct_cont
, NULL
, flags
))
557 /* Set embedded content */
558 pos
= CMS_get0_content(cms
);
568 CMS_ContentInfo_free(cms
);
573 CMS_ContentInfo
*CMS_encrypt(STACK_OF(X509
) *certs
, BIO
*data
,
574 const EVP_CIPHER
*cipher
, unsigned int flags
)
576 CMS_ContentInfo
*cms
;
579 cms
= CMS_EnvelopedData_create(cipher
);
582 for (i
= 0; i
< sk_X509_num(certs
); i
++)
584 recip
= sk_X509_value(certs
, i
);
585 if (!CMS_add1_recipient_cert(cms
, recip
, flags
))
587 CMSerr(CMS_F_CMS_ENCRYPT
, CMS_R_RECIPIENT_ERROR
);
592 if(!(flags
& CMS_DETACHED
))
593 CMS_set_detached(cms
, 0);
595 if ((flags
& (CMS_STREAM
|CMS_PARTIAL
))
596 || CMS_final(cms
, data
, NULL
, flags
))
602 CMSerr(CMS_F_CMS_ENCRYPT
, ERR_R_MALLOC_FAILURE
);
605 CMS_ContentInfo_free(cms
);
609 int CMS_decrypt_set1_pkey(CMS_ContentInfo
*cms
, EVP_PKEY
*pk
, X509
*cert
)
611 STACK_OF(CMS_RecipientInfo
) *ris
;
612 CMS_RecipientInfo
*ri
;
614 int debug
= 0, ri_match
= 0;
615 ris
= CMS_get0_RecipientInfos(cms
);
617 debug
= cms
->d
.envelopedData
->encryptedContentInfo
->debug
;
618 for (i
= 0; i
< sk_CMS_RecipientInfo_num(ris
); i
++)
620 ri
= sk_CMS_RecipientInfo_value(ris
, i
);
621 if (CMS_RecipientInfo_type(ri
) != CMS_RECIPINFO_TRANS
)
624 /* If we have a cert try matching RecipientInfo
625 * otherwise try them all.
627 if (!cert
|| (CMS_RecipientInfo_ktri_cert_cmp(ri
, cert
) == 0))
629 CMS_RecipientInfo_set0_pkey(ri
, pk
);
630 r
= CMS_RecipientInfo_decrypt(cms
, ri
);
631 CMS_RecipientInfo_set0_pkey(ri
, NULL
);
634 /* If not debugging clear any error and
635 * return success to avoid leaking of
636 * information useful to MMA
645 CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY
,
646 CMS_R_DECRYPT_ERROR
);
649 /* If no cert and not debugging don't leave loop
650 * after first successful decrypt. Always attempt
651 * to decrypt all recipients to avoid leaking timing
652 * of a successful decrypt.
654 else if (r
> 0 && debug
)
658 /* If no cert and not debugging always return success */
659 if (ri_match
&& !cert
&& !debug
)
665 CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY
, CMS_R_NO_MATCHING_RECIPIENT
);
670 int CMS_decrypt_set1_key(CMS_ContentInfo
*cms
,
671 unsigned char *key
, size_t keylen
,
672 unsigned char *id
, size_t idlen
)
674 STACK_OF(CMS_RecipientInfo
) *ris
;
675 CMS_RecipientInfo
*ri
;
677 ris
= CMS_get0_RecipientInfos(cms
);
678 for (i
= 0; i
< sk_CMS_RecipientInfo_num(ris
); i
++)
680 ri
= sk_CMS_RecipientInfo_value(ris
, i
);
681 if (CMS_RecipientInfo_type(ri
) != CMS_RECIPINFO_KEK
)
684 /* If we have an id try matching RecipientInfo
685 * otherwise try them all.
687 if (!id
|| (CMS_RecipientInfo_kekri_id_cmp(ri
, id
, idlen
) == 0))
689 CMS_RecipientInfo_set0_key(ri
, key
, keylen
);
690 r
= CMS_RecipientInfo_decrypt(cms
, ri
);
691 CMS_RecipientInfo_set0_key(ri
, NULL
, 0);
696 CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY
,
697 CMS_R_DECRYPT_ERROR
);
704 CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY
, CMS_R_NO_MATCHING_RECIPIENT
);
709 int CMS_decrypt_set1_password(CMS_ContentInfo
*cms
,
710 unsigned char *pass
, ossl_ssize_t passlen
)
712 STACK_OF(CMS_RecipientInfo
) *ris
;
713 CMS_RecipientInfo
*ri
;
715 ris
= CMS_get0_RecipientInfos(cms
);
716 for (i
= 0; i
< sk_CMS_RecipientInfo_num(ris
); i
++)
718 ri
= sk_CMS_RecipientInfo_value(ris
, i
);
719 if (CMS_RecipientInfo_type(ri
) != CMS_RECIPINFO_PASS
)
721 CMS_RecipientInfo_set0_password(ri
, pass
, passlen
);
722 r
= CMS_RecipientInfo_decrypt(cms
, ri
);
723 CMS_RecipientInfo_set0_password(ri
, NULL
, 0);
728 CMSerr(CMS_F_CMS_DECRYPT_SET1_PASSWORD
, CMS_R_NO_MATCHING_RECIPIENT
);
733 int CMS_decrypt(CMS_ContentInfo
*cms
, EVP_PKEY
*pk
, X509
*cert
,
734 BIO
*dcont
, BIO
*out
,
739 if (OBJ_obj2nid(CMS_get0_type(cms
)) != NID_pkcs7_enveloped
)
741 CMSerr(CMS_F_CMS_DECRYPT
, CMS_R_TYPE_NOT_ENVELOPED_DATA
);
744 if (!dcont
&& !check_content(cms
))
746 if (flags
& CMS_DEBUG_DECRYPT
)
747 cms
->d
.envelopedData
->encryptedContentInfo
->debug
= 1;
749 cms
->d
.envelopedData
->encryptedContentInfo
->debug
= 0;
750 if (!pk
&& !cert
&& !dcont
&& !out
)
752 if (pk
&& !CMS_decrypt_set1_pkey(cms
, pk
, cert
))
754 cont
= CMS_dataInit(cms
, dcont
);
757 r
= cms_copy_content(out
, cont
, flags
);
758 do_free_upto(cont
, dcont
);
762 int CMS_final(CMS_ContentInfo
*cms
, BIO
*data
, BIO
*dcont
, unsigned int flags
)
766 if (!(cmsbio
= CMS_dataInit(cms
, dcont
)))
768 CMSerr(CMS_F_CMS_FINAL
,ERR_R_MALLOC_FAILURE
);
772 SMIME_crlf_copy(data
, cmsbio
, flags
);
774 (void)BIO_flush(cmsbio
);
777 if (!CMS_dataFinal(cms
, cmsbio
))
779 CMSerr(CMS_F_CMS_FINAL
,CMS_R_CMS_DATAFINAL_ERROR
);
786 do_free_upto(cmsbio
, dcont
);
794 int CMS_uncompress(CMS_ContentInfo
*cms
, BIO
*dcont
, BIO
*out
,
799 if (OBJ_obj2nid(CMS_get0_type(cms
)) != NID_id_smime_ct_compressedData
)
801 CMSerr(CMS_F_CMS_UNCOMPRESS
,
802 CMS_R_TYPE_NOT_COMPRESSED_DATA
);
806 if (!dcont
&& !check_content(cms
))
809 cont
= CMS_dataInit(cms
, dcont
);
812 r
= cms_copy_content(out
, cont
, flags
);
813 do_free_upto(cont
, dcont
);
817 CMS_ContentInfo
*CMS_compress(BIO
*in
, int comp_nid
, unsigned int flags
)
819 CMS_ContentInfo
*cms
;
821 comp_nid
= NID_zlib_compression
;
822 cms
= cms_CompressedData_create(comp_nid
);
826 if(!(flags
& CMS_DETACHED
))
827 CMS_set_detached(cms
, 0);
829 if ((flags
& CMS_STREAM
) || CMS_final(cms
, in
, NULL
, flags
))
832 CMS_ContentInfo_free(cms
);
838 int CMS_uncompress(CMS_ContentInfo
*cms
, BIO
*dcont
, BIO
*out
,
841 CMSerr(CMS_F_CMS_UNCOMPRESS
, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM
);
845 CMS_ContentInfo
*CMS_compress(BIO
*in
, int comp_nid
, unsigned int flags
)
847 CMSerr(CMS_F_CMS_COMPRESS
, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM
);