83711d8af4c9250310ec53e506d4fd498b208fb5
[openssl.git] / crypto / cms / cms_sd.c
1 /* crypto/cms/cms_sd.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/pem.h>
57 #include <openssl/x509v3.h>
58 #include <openssl/err.h>
59 #include <openssl/cms.h>
60 #include "cms_lcl.h"
61 #include "asn1_locl.h"
62
63 /* CMS SignedData Utilities */
64
65 DECLARE_ASN1_ITEM(CMS_SignedData)
66
67 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
68         {
69         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed)
70                 {
71                 CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
72                 return NULL;
73                 }
74         return cms->d.signedData;
75         }
76
77 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
78         {
79         if (cms->d.other == NULL)
80                 {
81                 cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
82                 if (!cms->d.signedData)
83                         {
84                         CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
85                         return NULL;
86                         }
87                 cms->d.signedData->version = 1;
88                 cms->d.signedData->encapContentInfo->eContentType =
89                                                 OBJ_nid2obj(NID_pkcs7_data);
90                 cms->d.signedData->encapContentInfo->partial = 1;
91                 ASN1_OBJECT_free(cms->contentType);
92                 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
93                 return cms->d.signedData;
94                 }
95         return cms_get0_signed(cms);
96         }
97
98 /* Just initialize SignedData e.g. for certs only structure */
99
100 int CMS_SignedData_init(CMS_ContentInfo *cms)
101         {
102         if (cms_signed_data_init(cms))
103                 return 1;
104         else
105                 return 0;
106         }
107
108 /* Check structures and fixup version numbers (if necessary) */
109
110 static void cms_sd_set_version(CMS_SignedData *sd)
111         {
112         int i;
113         CMS_CertificateChoices *cch;
114         CMS_RevocationInfoChoice *rch;
115         CMS_SignerInfo *si;
116
117         for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
118                 {
119                 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
120                 if (cch->type == CMS_CERTCHOICE_OTHER)
121                         {
122                         if (sd->version < 5)
123                                 sd->version = 5;
124                         }
125                 else if (cch->type == CMS_CERTCHOICE_V2ACERT)
126                         {
127                         if (sd->version < 4)
128                                 sd->version = 4;
129                         }
130                 else if (cch->type == CMS_CERTCHOICE_V1ACERT)
131                         {
132                         if (sd->version < 3)
133                                 sd->version = 3;
134                         }
135                 }
136
137         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
138                 {
139                 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
140                 if (rch->type == CMS_REVCHOICE_OTHER)
141                         {
142                         if (sd->version < 5)
143                                 sd->version = 5;
144                         }
145                 }
146
147         if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
148                         && (sd->version < 3))
149                 sd->version = 3;
150
151         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
152                 {
153                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
154                 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
155                         {
156                         if (si->version < 3)
157                                 si->version = 3;
158                         if (sd->version < 3)
159                                 sd->version = 3;
160                         }
161                 else
162                         sd->version = 1;
163                 }
164
165         if (sd->version < 1)
166                 sd->version = 1;
167
168         }
169         
170 /* Copy an existing messageDigest value */
171
172 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
173         {
174         STACK_OF(CMS_SignerInfo) *sinfos;
175         CMS_SignerInfo *sitmp;
176         int i;
177         sinfos = CMS_get0_SignerInfos(cms);
178         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
179                 {
180                 ASN1_OCTET_STRING *messageDigest;
181                 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
182                 if (sitmp == si)
183                         continue;
184                 if (CMS_signed_get_attr_count(sitmp) < 0)
185                         continue;
186                 if (OBJ_cmp(si->digestAlgorithm->algorithm,
187                                 sitmp->digestAlgorithm->algorithm))
188                         continue;
189                 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
190                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
191                                         -3, V_ASN1_OCTET_STRING);
192                 if (!messageDigest)
193                         {
194                         CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
195                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
196                         return 0;
197                         }
198
199                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
200                                                 V_ASN1_OCTET_STRING,
201                                                 messageDigest, -1))
202                         return 1;
203                 else
204                         return 0;
205                 }
206                 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
207                 return 0;
208         }
209
210 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
211         {
212         switch(type)
213                 {
214                 case CMS_SIGNERINFO_ISSUER_SERIAL:
215                 sid->d.issuerAndSerialNumber =
216                         M_ASN1_new_of(CMS_IssuerAndSerialNumber);
217                 if (!sid->d.issuerAndSerialNumber)
218                         goto merr;
219                 if (!X509_NAME_set(&sid->d.issuerAndSerialNumber->issuer,
220                                         X509_get_issuer_name(cert)))
221                         goto merr;
222                 if (!ASN1_STRING_copy(
223                         sid->d.issuerAndSerialNumber->serialNumber,
224                                 X509_get_serialNumber(cert)))
225                         goto merr;
226                 break;
227
228                 case CMS_SIGNERINFO_KEYIDENTIFIER:
229                 if (!cert->skid)
230                         {
231                         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER,
232                                         CMS_R_CERTIFICATE_HAS_NO_KEYID);
233                         return 0;
234                         }
235                 sid->d.subjectKeyIdentifier = ASN1_STRING_dup(cert->skid);
236                 if (!sid->d.subjectKeyIdentifier)
237                         goto merr;
238                 break;
239
240                 default:
241                 CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
242                 return 0;
243                 }
244
245         sid->type = type;
246
247         return 1;
248
249         merr:
250         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, ERR_R_MALLOC_FAILURE);
251         return 0;
252
253         }
254
255 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
256                                         ASN1_OCTET_STRING **keyid,
257                                         X509_NAME **issuer, ASN1_INTEGER **sno)
258         {
259         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
260                 {
261                 if (issuer)
262                         *issuer = sid->d.issuerAndSerialNumber->issuer;
263                 if (sno)
264                         *sno = sid->d.issuerAndSerialNumber->serialNumber;
265                 }
266         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
267                 {
268                 if (keyid)
269                         *keyid = sid->d.subjectKeyIdentifier;
270                 }
271         else
272                 return 0;
273         return 1;
274         }
275
276 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
277         {
278         int ret;
279         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
280                 {
281                 ret = X509_NAME_cmp(sid->d.issuerAndSerialNumber->issuer,
282                                         X509_get_issuer_name(cert));
283                 if (ret)
284                         return ret;
285                 return ASN1_INTEGER_cmp(sid->d.issuerAndSerialNumber->serialNumber,
286                                         X509_get_serialNumber(cert));
287                 }
288         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
289                 {
290                 X509_check_purpose(cert, -1, -1);
291                 if (!cert->skid)
292                         return -1;
293                 return ASN1_OCTET_STRING_cmp(sid->d.subjectKeyIdentifier,
294                                                         cert->skid);
295                 }
296         else
297                 return -1;
298         }
299
300 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
301                         X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
302                         unsigned int flags)
303         {
304         CMS_SignedData *sd;
305         CMS_SignerInfo *si = NULL;
306         X509_ALGOR *alg;
307         int i, type;
308         if(!X509_check_private_key(signer, pk))
309                 {
310                 CMSerr(CMS_F_CMS_ADD1_SIGNER,
311                         CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
312                 return NULL;
313                 }
314         sd = cms_signed_data_init(cms);
315         if (!sd)
316                 goto err;
317         si = M_ASN1_new_of(CMS_SignerInfo);
318         if (!si)
319                 goto merr;
320         X509_check_purpose(signer, -1, -1);
321
322         CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
323         CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
324
325         si->pkey = pk;
326         si->signer = signer;
327
328         if (flags & CMS_USE_KEYID)
329                 {
330                 si->version = 3;
331                 if (sd->version < 3)
332                         sd->version = 3;
333                 type = CMS_SIGNERINFO_KEYIDENTIFIER;
334                 }
335         else
336                 {
337                 type = CMS_SIGNERINFO_ISSUER_SERIAL;
338                 si->version = 1;
339                 }
340
341         if (!cms_set1_SignerIdentifier(si->sid, signer, type))
342                 goto err;
343
344         if (md == NULL)
345                 {
346                 int def_nid;
347                 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
348                         goto err;
349                 md = EVP_get_digestbynid(def_nid);
350                 if (md == NULL)
351                         {
352                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
353                         goto err;
354                         }
355                 }
356
357         if (!md)
358                 {
359                 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
360                 goto err;
361                 }
362
363         cms_DigestAlgorithm_set(si->digestAlgorithm, md);
364
365         /* See if digest is present in digestAlgorithms */
366         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
367                 {
368                 ASN1_OBJECT *aoid;
369                 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
370                 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
371                 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
372                         break;
373                 }
374
375         if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
376                 {
377                 alg = X509_ALGOR_new();
378                 if (!alg)
379                         goto merr;
380                 cms_DigestAlgorithm_set(alg, md);
381                 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
382                         {
383                         X509_ALGOR_free(alg);
384                         goto merr;
385                         }
386                 }
387
388         if (pk->ameth && pk->ameth->pkey_ctrl)
389                 {
390                 i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_SIGN,
391                                                 0, si);
392                 if (i == -2)
393                         {
394                         CMSerr(CMS_F_CMS_ADD1_SIGNER,
395                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
396                         goto err;
397                         }
398                 if (i <= 0)
399                         {
400                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_CTRL_FAILURE);
401                         goto err;
402                         }
403                 }
404
405         if (!(flags & CMS_NOATTR))
406                 {
407                 /* Initialialize signed attributes strutucture so other
408                  * attributes such as signing time etc are added later
409                  * even if we add none here.
410                  */
411                 if (!si->signedAttrs)
412                         {
413                         si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
414                         if (!si->signedAttrs)
415                                 goto merr;
416                         }
417
418                 if (!(flags & CMS_NOSMIMECAP))
419                         {
420                         STACK_OF(X509_ALGOR) *smcap = NULL;
421                         i = CMS_add_standard_smimecap(&smcap);
422                         if (i)
423                                 i = CMS_add_smimecap(si, smcap);
424                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
425                         if (!i)
426                                 goto merr;
427                         }
428                 if (flags & CMS_REUSE_DIGEST)
429                         {
430                         if (!cms_copy_messageDigest(cms, si))
431                                 goto err;
432                         if (!(flags & CMS_PARTIAL) &&
433                                         !CMS_SignerInfo_sign(si))
434                                 goto err;
435                         }
436                 }
437
438         if (!(flags & CMS_NOCERTS))
439                 {
440                 /* NB ignore -1 return for duplicate cert */
441                 if (!CMS_add1_cert(cms, signer))
442                         goto merr;
443                 }
444
445         if (!sd->signerInfos)
446                 sd->signerInfos = sk_CMS_SignerInfo_new_null();
447         if (!sd->signerInfos ||
448                 !sk_CMS_SignerInfo_push(sd->signerInfos, si))
449                 goto merr;
450
451         return si;
452
453         merr:
454         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
455         err:
456         if (si)
457                 M_ASN1_free_of(si, CMS_SignerInfo);
458         return NULL;
459
460         }
461
462 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
463         {
464         ASN1_TIME *tt;
465         int r = 0;
466         if (t)
467                 tt = t;
468         else
469                 tt = X509_gmtime_adj(NULL, 0);
470
471         if (!tt)
472                 goto merr;
473
474         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
475                                                 tt->type, tt, -1) <= 0)
476                 goto merr;
477
478         r = 1;
479
480         merr:
481
482         if (!t)
483                 ASN1_TIME_free(tt);
484
485         if (!r)
486                 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
487
488         return r;
489
490         }
491
492 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
493         {
494         CMS_SignedData *sd;
495         sd = cms_get0_signed(cms);
496         if (!sd)
497                 return NULL;
498         return sd->signerInfos;
499         }
500
501 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
502         {
503         STACK_OF(X509) *signers = NULL;
504         STACK_OF(CMS_SignerInfo) *sinfos;
505         CMS_SignerInfo *si;
506         int i;
507         sinfos = CMS_get0_SignerInfos(cms);
508         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
509                 {
510                 si = sk_CMS_SignerInfo_value(sinfos, i);
511                 if (si->signer)
512                         {
513                         if (!signers)
514                                 {
515                                 signers = sk_X509_new_null();
516                                 if (!signers)
517                                         return NULL;
518                                 }
519                         if (!sk_X509_push(signers, si->signer))
520                                 {
521                                 sk_X509_free(signers);
522                                 return NULL;
523                                 }
524                         }
525                 }
526         return signers;
527         }
528
529 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
530         {
531         if (signer)
532                 {
533                 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
534                 if (si->pkey)
535                         EVP_PKEY_free(si->pkey);
536                 si->pkey = X509_get_pubkey(signer);
537                 }
538         if (si->signer)
539                 X509_free(si->signer);
540         si->signer = signer;
541         }
542
543 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
544                                         ASN1_OCTET_STRING **keyid,
545                                         X509_NAME **issuer, ASN1_INTEGER **sno)
546         {
547         return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
548         }
549
550 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
551         {
552         return cms_SignerIdentifier_cert_cmp(si->sid, cert);
553         }
554
555 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
556                                 unsigned int flags)
557         {
558         CMS_SignedData *sd;
559         CMS_SignerInfo *si;
560         CMS_CertificateChoices *cch;
561         STACK_OF(CMS_CertificateChoices) *certs;
562         X509 *x;
563         int i, j;
564         int ret = 0;
565         sd = cms_get0_signed(cms);
566         if (!sd)
567                 return -1;
568         certs = sd->certificates;
569         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
570                 {
571                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
572                 if (si->signer)
573                         continue;
574
575                 for (j = 0; j < sk_X509_num(scerts); j++)
576                         {
577                         x = sk_X509_value(scerts, j);
578                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
579                                 {
580                                 CMS_SignerInfo_set1_signer_cert(si, x);
581                                 ret++;
582                                 break;
583                                 }
584                         }
585
586                 if (si->signer || (flags & CMS_NOINTERN))
587                         continue;
588
589                 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
590                         {
591                         cch = sk_CMS_CertificateChoices_value(certs, j);
592                         if (cch->type != 0)
593                                 continue;
594                         x = cch->d.certificate;
595                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
596                                 {
597                                 CMS_SignerInfo_set1_signer_cert(si, x);
598                                 ret++;
599                                 break;
600                                 }
601                         }
602                 }
603         return ret;
604         }
605
606 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
607                                         X509_ALGOR **pdig, X509_ALGOR **psig)
608         {
609         if (pk)
610                 *pk = si->pkey;
611         if (signer)
612                 *signer = si->signer;
613         if (pdig)
614                 *pdig = si->digestAlgorithm;
615         if (psig)
616                 *psig = si->signatureAlgorithm;
617         }
618
619 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
620                                         CMS_SignerInfo *si, BIO *chain)
621         {
622         EVP_MD_CTX mctx;
623         int r = 0;
624         EVP_MD_CTX_init(&mctx);
625
626
627         if (!si->pkey)
628                 {
629                 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
630                 return 0;
631                 }
632
633         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
634                 goto err;
635
636         /* If any signed attributes calculate and add messageDigest attribute */
637
638         if (CMS_signed_get_attr_count(si) >= 0)
639                 {
640                 ASN1_OBJECT *ctype =
641                         cms->d.signedData->encapContentInfo->eContentType; 
642                 unsigned char md[EVP_MAX_MD_SIZE];
643                 unsigned int mdlen;
644                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
645                         goto err;
646                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
647                                                 V_ASN1_OCTET_STRING,
648                                                 md, mdlen))
649                         goto err;
650                 /* Copy content type across */
651                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
652                                         V_ASN1_OBJECT, ctype, -1) <= 0)
653                         goto err;
654                 if (!CMS_SignerInfo_sign(si))
655                         goto err;
656                 }
657         else
658                 {
659                 unsigned char *sig;
660                 unsigned int siglen;
661                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
662                 if (!sig)
663                         {
664                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
665                                         ERR_R_MALLOC_FAILURE);
666                         goto err;
667                         }
668                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
669                         {
670                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
671                                         CMS_R_SIGNFINAL_ERROR);
672                         OPENSSL_free(sig);
673                         goto err;
674                         }
675                 ASN1_STRING_set0(si->signature, sig, siglen);
676                 }
677
678         r = 1;
679
680         err:
681         EVP_MD_CTX_cleanup(&mctx);
682         return r;
683
684         }
685
686 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
687         {
688         STACK_OF(CMS_SignerInfo) *sinfos;
689         CMS_SignerInfo *si;
690         int i;
691         sinfos = CMS_get0_SignerInfos(cms);
692         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
693                 {
694                 si = sk_CMS_SignerInfo_value(sinfos, i);
695                 if (!cms_SignerInfo_content_sign(cms, si, chain))
696                         return 0;
697                 }
698         cms->d.signedData->encapContentInfo->partial = 0;
699         return 1;
700         }
701
702 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
703         {
704         EVP_MD_CTX mctx;
705         EVP_PKEY_CTX *pctx;
706         unsigned char *abuf = NULL;
707         int alen;
708         size_t siglen;
709         const EVP_MD *md = NULL;
710
711         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
712         if (md == NULL)
713                 return 0;
714
715         EVP_MD_CTX_init(&mctx);
716
717         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
718                 {
719                 if (!cms_add1_signingTime(si, NULL))
720                         goto err;
721                 }
722
723         if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
724                 goto err;
725
726         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
727                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
728                 {
729                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
730                 goto err;
731                 }
732
733         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
734                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
735         if(!abuf)
736                 goto err;
737         if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
738                 goto err;
739         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
740                 goto err;
741         OPENSSL_free(abuf);
742         abuf = OPENSSL_malloc(siglen);
743         if(!abuf)
744                 goto err;
745         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
746                 goto err;
747
748         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
749                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
750                 {
751                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
752                 goto err;
753                 }
754
755         EVP_MD_CTX_cleanup(&mctx);
756
757         ASN1_STRING_set0(si->signature, abuf, siglen);
758
759         return 1;
760
761         err:
762         if (abuf)
763                 OPENSSL_free(abuf);
764         EVP_MD_CTX_cleanup(&mctx);
765         return 0;
766
767         }
768
769 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
770         {
771         EVP_MD_CTX mctx;
772         EVP_PKEY_CTX *pctx;
773         unsigned char *abuf = NULL;
774         int alen, r = -1;
775         const EVP_MD *md = NULL;
776
777         if (!si->pkey)
778                 {
779                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
780                 return -1;
781                 }
782
783         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
784         if (md == NULL)
785                 return -1;
786         EVP_MD_CTX_init(&mctx);
787         if (EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
788                 goto err;
789
790         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
791                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
792         if(!abuf)
793                 goto err;
794         r = EVP_DigestVerifyUpdate(&mctx, abuf, alen);
795         OPENSSL_free(abuf);
796         if (r <= 0)
797                 {
798                 r = -1;
799                 goto err;
800                 }
801         r = EVP_DigestVerifyFinal(&mctx,
802                         si->signature->data, si->signature->length);
803         if (!r)
804                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
805         err:
806         EVP_MD_CTX_cleanup(&mctx);
807         return r;
808         }
809
810 /* Create a chain of digest BIOs from a CMS ContentInfo */
811
812 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
813         {
814         int i;
815         CMS_SignedData *sd;
816         BIO *chain = NULL;
817         sd = cms_get0_signed(cms);
818         if (!sd)
819                 return NULL;
820         if (cms->d.signedData->encapContentInfo->partial)
821                 cms_sd_set_version(sd);
822         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
823                 {
824                 X509_ALGOR *digestAlgorithm;
825                 BIO *mdbio;
826                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
827                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
828                 if (!mdbio)
829                         goto err;       
830                 if (chain)
831                          BIO_push(chain, mdbio);
832                 else
833                         chain = mdbio;
834                 }
835         return chain;
836         err:
837         if (chain)
838                 BIO_free_all(chain);
839         return NULL;
840         }
841
842 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
843         {
844         ASN1_OCTET_STRING *os = NULL;
845         EVP_MD_CTX mctx;
846         int r = -1;
847         EVP_MD_CTX_init(&mctx);
848         /* If we have any signed attributes look for messageDigest value */
849         if (CMS_signed_get_attr_count(si) >= 0)
850                 {
851                 os = CMS_signed_get0_data_by_OBJ(si,
852                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
853                                         -3, V_ASN1_OCTET_STRING);
854                 if (!os)
855                         {
856                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
857                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
858                         goto err;
859                         }
860                 }
861
862         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
863                 goto err;
864
865         /* If messageDigest found compare it */
866
867         if (os)
868                 {
869                 unsigned char mval[EVP_MAX_MD_SIZE];
870                 unsigned int mlen;
871                 if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
872                         {
873                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
874                                 CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
875                         goto err;
876                         }
877                 if (mlen != (unsigned int)os->length)
878                         {
879                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
880                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
881                         goto err;
882                         }
883
884                 if (memcmp(mval, os->data, mlen))
885                         {
886                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
887                                 CMS_R_VERIFICATION_FAILURE);
888                         r = 0;
889                         }
890                 else
891                         r = 1;
892                 }
893         else
894                 {
895                 r = EVP_VerifyFinal(&mctx, si->signature->data,
896                                         si->signature->length, si->pkey);
897                 if (r <= 0)
898                         {
899                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
900                                 CMS_R_VERIFICATION_FAILURE);
901                         r = 0;
902                         }
903                 }
904
905         err:
906         EVP_MD_CTX_cleanup(&mctx);
907         return r;
908
909         }
910
911 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
912         {
913         unsigned char *smder = NULL;
914         int smderlen, r;
915         smderlen = i2d_X509_ALGORS(algs, &smder);
916         if (smderlen <= 0)
917                 return 0;
918         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
919                                         V_ASN1_SEQUENCE, smder, smderlen);
920         OPENSSL_free(smder);
921         return r;
922         }
923
924 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
925                                 int algnid, int keysize)
926         {
927         X509_ALGOR *alg;
928         ASN1_INTEGER *key = NULL;
929         if (keysize > 0)
930                 {
931                 key = ASN1_INTEGER_new();
932                 if (!key || !ASN1_INTEGER_set(key, keysize))
933                         return 0;
934                 }
935         alg = X509_ALGOR_new();
936         if (!alg)
937                 {
938                 if (key)
939                         ASN1_INTEGER_free(key);
940                 return 0;
941                 }
942                 
943         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
944                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
945         if (!*algs)
946                 *algs = sk_X509_ALGOR_new_null();
947         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
948                 {
949                 X509_ALGOR_free(alg);
950                 return 0;
951                 }
952         return 1;
953         }
954
955 /* Check to see if a cipher exists and if so add S/MIME capabilities */
956
957 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
958         {
959         if (EVP_get_cipherbynid(nid))
960                 return CMS_add_simple_smimecap(sk, nid, arg);
961         return 1;
962         }
963
964 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
965         {
966         if (EVP_get_digestbynid(nid))
967                 return CMS_add_simple_smimecap(sk, nid, arg);
968         return 1;
969         }
970
971 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
972         {
973         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
974                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
975                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
976                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
977                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
978                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
979                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
980                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
981                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
982                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
983                 return 0;
984         return 1;
985         }