d0f3ed0411c94fcc0f1c2fbc35f603f2e0e23fbc
[openssl.git] / crypto / pkcs7 / pk7_doit.c
1 /* crypto/pkcs7/pk7_doit.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65
66 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
67                          void *value);
68 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
69
70 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
71         {
72         int i,j;
73         BIO *out=NULL,*btmp=NULL;
74         X509_ALGOR *xa;
75         const EVP_MD *evp_md;
76         const EVP_CIPHER *evp_cipher=NULL;
77         STACK_OF(X509_ALGOR) *md_sk=NULL;
78         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
79         X509_ALGOR *xalg=NULL;
80         PKCS7_RECIP_INFO *ri=NULL;
81         EVP_PKEY *pkey;
82
83         i=OBJ_obj2nid(p7->type);
84         p7->state=PKCS7_S_HEADER;
85
86         switch (i)
87                 {
88         case NID_pkcs7_signed:
89                 md_sk=p7->d.sign->md_algs;
90                 break;
91         case NID_pkcs7_signedAndEnveloped:
92                 rsk=p7->d.signed_and_enveloped->recipientinfo;
93                 md_sk=p7->d.signed_and_enveloped->md_algs;
94                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
95                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
96                 if (evp_cipher == NULL)
97                         {
98                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
99                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
100                         goto err;
101                         }
102                 break;
103         case NID_pkcs7_enveloped:
104                 rsk=p7->d.enveloped->recipientinfo;
105                 xalg=p7->d.enveloped->enc_data->algorithm;
106                 evp_cipher=p7->d.enveloped->enc_data->cipher;
107                 if (evp_cipher == NULL)
108                         {
109                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
110                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
111                         goto err;
112                         }
113                 break;
114         default:
115                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
116                 goto err;
117                 }
118
119         if (md_sk != NULL)
120                 {
121                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
122                         {
123                         xa=sk_X509_ALGOR_value(md_sk,i);
124                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
125                                 {
126                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
127                                 goto err;
128                                 }
129
130                         j=OBJ_obj2nid(xa->algorithm);
131                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
132                         if (evp_md == NULL)
133                                 {
134                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
135                                 goto err;
136                                 }
137
138                         BIO_set_md(btmp,evp_md);
139                         if (out == NULL)
140                                 out=btmp;
141                         else
142                                 BIO_push(out,btmp);
143                         btmp=NULL;
144                         }
145                 }
146
147         if (evp_cipher != NULL)
148                 {
149                 unsigned char key[EVP_MAX_KEY_LENGTH];
150                 unsigned char iv[EVP_MAX_IV_LENGTH];
151                 int keylen,ivlen;
152                 int jj,max;
153                 unsigned char *tmp;
154                 EVP_CIPHER_CTX *ctx;
155
156                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
157                         {
158                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
159                         goto err;
160                         }
161                 BIO_get_cipher_ctx(btmp, &ctx);
162                 keylen=EVP_CIPHER_key_length(evp_cipher);
163                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
164                 if (RAND_bytes(key,keylen) <= 0)
165                         goto err;
166                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
167                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
168                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
169
170                 if (ivlen > 0) {
171                         if (xalg->parameter == NULL) 
172                                                 xalg->parameter=ASN1_TYPE_new();
173                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
174                                                                        goto err;
175                 }
176
177                 /* Lets do the pub key stuff :-) */
178                 max=0;
179                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
180                         {
181                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
182                         if (ri->cert == NULL)
183                                 {
184                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
185                                 goto err;
186                                 }
187                         pkey=X509_get_pubkey(ri->cert);
188                         jj=EVP_PKEY_size(pkey);
189                         EVP_PKEY_free(pkey);
190                         if (max < jj) max=jj;
191                         }
192                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
193                         {
194                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
195                         goto err;
196                         }
197                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
198                         {
199                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
200                         pkey=X509_get_pubkey(ri->cert);
201                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
202                         EVP_PKEY_free(pkey);
203                         if (jj <= 0)
204                                 {
205                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
206                                 OPENSSL_free(tmp);
207                                 goto err;
208                                 }
209                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
210                         }
211                 OPENSSL_free(tmp);
212                 memset(key, 0, keylen);
213
214                 if (out == NULL)
215                         out=btmp;
216                 else
217                         BIO_push(out,btmp);
218                 btmp=NULL;
219                 }
220
221         if (bio == NULL) {
222                 if (PKCS7_is_detached(p7))
223                         bio=BIO_new(BIO_s_null());
224                 else {
225                         if (PKCS7_type_is_signed(p7) &&
226                                 PKCS7_type_is_data(p7->d.sign->contents)) {
227                                 ASN1_OCTET_STRING *os;
228                                 os=p7->d.sign->contents->d.data;
229                                 if (os->length > 0) bio = 
230                                         BIO_new_mem_buf(os->data, os->length);
231                         } 
232                         if(bio == NULL) {
233                                 bio=BIO_new(BIO_s_mem());
234                                 BIO_set_mem_eof_return(bio,0);
235                         }
236                 }
237         }
238         BIO_push(out,bio);
239         bio=NULL;
240         if (0)
241                 {
242 err:
243                 if (out != NULL)
244                         BIO_free_all(out);
245                 if (btmp != NULL)
246                         BIO_free_all(btmp);
247                 out=NULL;
248                 }
249         return(out);
250         }
251
252 /* int */
253 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
254         {
255         int i,j;
256         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
257         unsigned char *tmp=NULL;
258         X509_ALGOR *xa;
259         ASN1_OCTET_STRING *data_body=NULL;
260         const EVP_MD *evp_md;
261         const EVP_CIPHER *evp_cipher=NULL;
262         EVP_CIPHER_CTX *evp_ctx=NULL;
263         X509_ALGOR *enc_alg=NULL;
264         STACK_OF(X509_ALGOR) *md_sk=NULL;
265         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
266         X509_ALGOR *xalg=NULL;
267         PKCS7_RECIP_INFO *ri=NULL;
268
269         i=OBJ_obj2nid(p7->type);
270         p7->state=PKCS7_S_HEADER;
271
272         switch (i)
273                 {
274         case NID_pkcs7_signed:
275                 data_body=p7->d.sign->contents->d.data;
276                 md_sk=p7->d.sign->md_algs;
277                 break;
278         case NID_pkcs7_signedAndEnveloped:
279                 rsk=p7->d.signed_and_enveloped->recipientinfo;
280                 md_sk=p7->d.signed_and_enveloped->md_algs;
281                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
282                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
283                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
284                 if (evp_cipher == NULL)
285                         {
286                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
287                         goto err;
288                         }
289                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
290                 break;
291         case NID_pkcs7_enveloped:
292                 rsk=p7->d.enveloped->recipientinfo;
293                 enc_alg=p7->d.enveloped->enc_data->algorithm;
294                 data_body=p7->d.enveloped->enc_data->enc_data;
295                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
296                 if (evp_cipher == NULL)
297                         {
298                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
299                         goto err;
300                         }
301                 xalg=p7->d.enveloped->enc_data->algorithm;
302                 break;
303         default:
304                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
305                 goto err;
306                 }
307
308         /* We will be checking the signature */
309         if (md_sk != NULL)
310                 {
311                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
312                         {
313                         xa=sk_X509_ALGOR_value(md_sk,i);
314                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
315                                 {
316                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
317                                 goto err;
318                                 }
319
320                         j=OBJ_obj2nid(xa->algorithm);
321                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
322                         if (evp_md == NULL)
323                                 {
324                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
325                                 goto err;
326                                 }
327
328                         BIO_set_md(btmp,evp_md);
329                         if (out == NULL)
330                                 out=btmp;
331                         else
332                                 BIO_push(out,btmp);
333                         btmp=NULL;
334                         }
335                 }
336
337         if (evp_cipher != NULL)
338                 {
339 #if 0
340                 unsigned char key[EVP_MAX_KEY_LENGTH];
341                 unsigned char iv[EVP_MAX_IV_LENGTH];
342                 unsigned char *p;
343                 int keylen,ivlen;
344                 int max;
345                 X509_OBJECT ret;
346 #endif
347                 int jj;
348
349                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
350                         {
351                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
352                         goto err;
353                         }
354
355                 /* It was encrypted, we need to decrypt the secret key
356                  * with the private key */
357
358                 /* Find the recipientInfo which matches the passed certificate
359                  * (if any)
360                  */
361
362                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
363                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
364                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
365                                         pcert->cert_info->issuer) &&
366                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
367                                         ri->issuer_and_serial->serial)) break;
368                         ri=NULL;
369                 }
370                 if (ri == NULL) {
371                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
372                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
373                         return(NULL);
374                 }
375
376                 jj=EVP_PKEY_size(pkey);
377                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
378                 if (tmp == NULL)
379                         {
380                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
381                         goto err;
382                         }
383
384                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
385                         M_ASN1_STRING_length(ri->enc_key), pkey);
386                 if (jj <= 0)
387                         {
388                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
389                         goto err;
390                         }
391
392                 evp_ctx=NULL;
393                 BIO_get_cipher_ctx(etmp,&evp_ctx);
394                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
395                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
396                         return(NULL);
397
398                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
399                         /* Some S/MIME clients don't use the same key
400                          * and effective key length. The key length is
401                          * determined by the size of the decrypted RSA key.
402                          */
403                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
404                                 {
405                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
406                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
407                                 goto err;
408                                 }
409                 } 
410                 EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
411
412                 memset(tmp,0,jj);
413
414                 if (out == NULL)
415                         out=etmp;
416                 else
417                         BIO_push(out,etmp);
418                 etmp=NULL;
419                 }
420
421 #if 1
422         if (PKCS7_is_detached(p7) || (in_bio != NULL))
423                 {
424                 bio=in_bio;
425                 }
426         else 
427                 {
428 #if 0
429                 bio=BIO_new(BIO_s_mem());
430                 /* We need to set this so that when we have read all
431                  * the data, the encrypt BIO, if present, will read
432                  * EOF and encode the last few bytes */
433                 BIO_set_mem_eof_return(bio,0);
434
435                 if (data_body->length > 0)
436                         BIO_write(bio,(char *)data_body->data,data_body->length);
437 #else
438                 if (data_body->length > 0)
439                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
440                 else {
441                         bio=BIO_new(BIO_s_mem());
442                         BIO_set_mem_eof_return(bio,0);
443                 }
444 #endif
445                 }
446         BIO_push(out,bio);
447         bio=NULL;
448 #endif
449         if (0)
450                 {
451 err:
452                 if (out != NULL) BIO_free_all(out);
453                 if (btmp != NULL) BIO_free_all(btmp);
454                 if (etmp != NULL) BIO_free_all(etmp);
455                 if (bio != NULL) BIO_free_all(bio);
456                 out=NULL;
457                 }
458         if (tmp != NULL)
459                 OPENSSL_free(tmp);
460         return(out);
461         }
462
463 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
464         {
465         int ret=0;
466         int i,j;
467         BIO *btmp;
468         BUF_MEM *buf_mem=NULL;
469         BUF_MEM *buf=NULL;
470         PKCS7_SIGNER_INFO *si;
471         EVP_MD_CTX *mdc,ctx_tmp;
472         STACK_OF(X509_ATTRIBUTE) *sk;
473         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
474         ASN1_OCTET_STRING *os=NULL;
475
476         i=OBJ_obj2nid(p7->type);
477         p7->state=PKCS7_S_HEADER;
478
479         switch (i)
480                 {
481         case NID_pkcs7_signedAndEnveloped:
482                 /* XXXXXXXXXXXXXXXX */
483                 si_sk=p7->d.signed_and_enveloped->signer_info;
484                 os=M_ASN1_OCTET_STRING_new();
485                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
486                 break;
487         case NID_pkcs7_enveloped:
488                 /* XXXXXXXXXXXXXXXX */
489                 os=M_ASN1_OCTET_STRING_new();
490                 p7->d.enveloped->enc_data->enc_data=os;
491                 break;
492         case NID_pkcs7_signed:
493                 si_sk=p7->d.sign->signer_info;
494                 os=p7->d.sign->contents->d.data;
495                 /* If detached data then the content is excluded */
496                 if(p7->detached) {
497                         M_ASN1_OCTET_STRING_free(os);
498                         p7->d.sign->contents->d.data = NULL;
499                 }
500                 break;
501                 }
502
503         if (si_sk != NULL)
504                 {
505                 if ((buf=BUF_MEM_new()) == NULL)
506                         {
507                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
508                         goto err;
509                         }
510                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
511                         {
512                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
513                         if (si->pkey == NULL) continue;
514
515                         j=OBJ_obj2nid(si->digest_alg->algorithm);
516
517                         btmp=bio;
518                         for (;;)
519                                 {
520                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
521                                         == NULL)
522                                         {
523                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
524                                         goto err;
525                                         }
526                                 BIO_get_md_ctx(btmp,&mdc);
527                                 if (mdc == NULL)
528                                         {
529                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
530                                         goto err;
531                                         }
532                                 if (EVP_MD_CTX_type(mdc) == j)
533                                         break;
534                                 else
535                                         btmp=BIO_next(btmp);
536                                 }
537                         
538                         /* We now have the EVP_MD_CTX, lets do the
539                          * signing. */
540                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
541                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
542                                 {
543                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
544                                 goto err;
545                                 }
546
547                         sk=si->auth_attr;
548
549                         /* If there are attributes, we add the digest
550                          * attribute and only sign the attributes */
551                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
552                                 {
553                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
554                                 unsigned int md_len, alen;
555                                 ASN1_OCTET_STRING *digest;
556                                 ASN1_UTCTIME *sign_time;
557                                 const EVP_MD *md_tmp;
558
559                                 /* Add signing time */
560                                 sign_time=X509_gmtime_adj(NULL,0);
561                                 PKCS7_add_signed_attribute(si,
562                                         NID_pkcs9_signingTime,
563                                         V_ASN1_UTCTIME,sign_time);
564
565                                 /* Add digest */
566                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
567                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
568                                 digest=M_ASN1_OCTET_STRING_new();
569                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
570                                 PKCS7_add_signed_attribute(si,
571                                         NID_pkcs9_messageDigest,
572                                         V_ASN1_OCTET_STRING,digest);
573
574                                 /* Now sign the attributes */
575                                 EVP_SignInit(&ctx_tmp,md_tmp);
576                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
577                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
578                                 if(!abuf) goto err;
579                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
580                                 OPENSSL_free(abuf);
581                                 }
582
583 #ifndef OPENSSL_NO_DSA
584                         if (si->pkey->type == EVP_PKEY_DSA)
585                                 ctx_tmp.digest=EVP_dss1();
586 #endif
587
588                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
589                                 (unsigned int *)&buf->length,si->pkey))
590                                 {
591                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
592                                 goto err;
593                                 }
594                         if (!ASN1_STRING_set(si->enc_digest,
595                                 (unsigned char *)buf->data,buf->length))
596                                 {
597                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
598                                 goto err;
599                                 }
600                         }
601                 }
602
603         if (!PKCS7_is_detached(p7))
604                 {
605                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
606                 if (btmp == NULL)
607                         {
608                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
609                         goto err;
610                         }
611                 BIO_get_mem_ptr(btmp,&buf_mem);
612                 /* Mark the BIO read only then we can use its copy of the data
613                  * instead of making an extra copy.
614                  */
615                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
616                 BIO_set_mem_eof_return(btmp, 0);
617                 os->data = (unsigned char *)buf_mem->data;
618                 os->length = buf_mem->length;
619 #if 0
620                 M_ASN1_OCTET_STRING_set(os,
621                         (unsigned char *)buf_mem->data,buf_mem->length);
622 #endif
623                 }
624         ret=1;
625 err:
626         if (buf != NULL) BUF_MEM_free(buf);
627         return(ret);
628         }
629
630 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
631              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
632         {
633         PKCS7_ISSUER_AND_SERIAL *ias;
634         int ret=0,i;
635         STACK_OF(X509) *cert;
636         X509 *x509;
637
638         if (PKCS7_type_is_signed(p7))
639                 {
640                 cert=p7->d.sign->cert;
641                 }
642         else if (PKCS7_type_is_signedAndEnveloped(p7))
643                 {
644                 cert=p7->d.signed_and_enveloped->cert;
645                 }
646         else
647                 {
648                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
649                 goto err;
650                 }
651         /* XXXXXXXXXXXXXXXXXXXXXXX */
652         ias=si->issuer_and_serial;
653
654         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
655
656         /* were we able to find the cert in passed to us */
657         if (x509 == NULL)
658                 {
659                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
660                 goto err;
661                 }
662
663         /* Lets verify */
664         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
665         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
666         i=X509_verify_cert(ctx);
667         if (i <= 0) 
668                 {
669                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
670                 X509_STORE_CTX_cleanup(ctx);
671                 goto err;
672                 }
673         X509_STORE_CTX_cleanup(ctx);
674
675         return PKCS7_signatureVerify(bio, p7, si, x509);
676         err:
677         return ret;
678         }
679
680 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
681                                                                 X509 *x509)
682         {
683         ASN1_OCTET_STRING *os;
684         EVP_MD_CTX mdc_tmp,*mdc;
685         int ret=0,i;
686         int md_type;
687         STACK_OF(X509_ATTRIBUTE) *sk;
688         BIO *btmp;
689         EVP_PKEY *pkey;
690
691         if (!PKCS7_type_is_signed(p7) && 
692                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
693                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
694                                                 PKCS7_R_WRONG_PKCS7_TYPE);
695                 goto err;
696         }
697
698         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
699
700         btmp=bio;
701         for (;;)
702                 {
703                 if ((btmp == NULL) ||
704                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
705                         {
706                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
707                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
708                         goto err;
709                         }
710                 BIO_get_md_ctx(btmp,&mdc);
711                 if (mdc == NULL)
712                         {
713                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
714                                                         ERR_R_INTERNAL_ERROR);
715                         goto err;
716                         }
717                 if (EVP_MD_CTX_type(mdc) == md_type)
718                         break;
719                 btmp=BIO_next(btmp);
720                 }
721
722         /* mdc is the digest ctx that we want, unless there are attributes,
723          * in which case the digest is the signed attributes */
724         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
725
726         sk=si->auth_attr;
727         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
728                 {
729                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
730                 unsigned int md_len, alen;
731                 ASN1_OCTET_STRING *message_digest;
732
733                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
734                 message_digest=PKCS7_digest_from_attributes(sk);
735                 if (!message_digest)
736                         {
737                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
738                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
739                         goto err;
740                         }
741                 if ((message_digest->length != (int)md_len) ||
742                         (memcmp(message_digest->data,md_dat,md_len)))
743                         {
744 #if 0
745 {
746 int ii;
747 for (ii=0; ii<message_digest->length; ii++)
748         printf("%02X",message_digest->data[ii]); printf(" sent\n");
749 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
750 }
751 #endif
752                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
753                                                         PKCS7_R_DIGEST_FAILURE);
754                         ret= -1;
755                         goto err;
756                         }
757
758                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
759
760                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
761                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
762                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
763
764                 OPENSSL_free(abuf);
765                 }
766
767         os=si->enc_digest;
768         pkey = X509_get_pubkey(x509);
769         if (!pkey)
770                 {
771                 ret = -1;
772                 goto err;
773                 }
774 #ifndef OPENSSL_NO_DSA
775         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
776 #endif
777
778         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
779         EVP_PKEY_free(pkey);
780         if (i <= 0)
781                 {
782                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
783                                                 PKCS7_R_SIGNATURE_FAILURE);
784                 ret= -1;
785                 goto err;
786                 }
787         else
788                 ret=1;
789 err:
790         return(ret);
791         }
792
793 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
794         {
795         STACK_OF(PKCS7_RECIP_INFO) *rsk;
796         PKCS7_RECIP_INFO *ri;
797         int i;
798
799         i=OBJ_obj2nid(p7->type);
800         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
801         rsk=p7->d.signed_and_enveloped->recipientinfo;
802         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
803         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
804         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
805         return(ri->issuer_and_serial);
806         }
807
808 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
809         {
810         return(get_attribute(si->auth_attr,nid));
811         }
812
813 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
814         {
815         return(get_attribute(si->unauth_attr,nid));
816         }
817
818 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
819         {
820         int i;
821         X509_ATTRIBUTE *xa;
822         ASN1_OBJECT *o;
823
824         o=OBJ_nid2obj(nid);
825         if (!o || !sk) return(NULL);
826         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
827                 {
828                 xa=sk_X509_ATTRIBUTE_value(sk,i);
829                 if (OBJ_cmp(xa->object,o) == 0)
830                         {
831                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
832                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
833                         else
834                                 return(NULL);
835                         }
836                 }
837         return(NULL);
838         }
839
840 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
841 {
842         ASN1_TYPE *astype;
843         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
844         return astype->value.octet_string;
845 }
846
847 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
848                                 STACK_OF(X509_ATTRIBUTE) *sk)
849         {
850         int i;
851
852         if (p7si->auth_attr != NULL)
853                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
854         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
855         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
856                 {
857                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
858                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
859                     == NULL)
860                         return(0);
861                 }
862         return(1);
863         }
864
865 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
866         {
867         int i;
868
869         if (p7si->unauth_attr != NULL)
870                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
871                                            X509_ATTRIBUTE_free);
872         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
873         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
874                 {
875                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
876                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
877                     == NULL)
878                         return(0);
879                 }
880         return(1);
881         }
882
883 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
884              void *value)
885         {
886         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
887         }
888
889 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
890              void *value)
891         {
892         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
893         }
894
895 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
896                          void *value)
897         {
898         X509_ATTRIBUTE *attr=NULL;
899
900         if (*sk == NULL)
901                 {
902                 *sk = sk_X509_ATTRIBUTE_new_null();
903 new_attrib:
904                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
905                 sk_X509_ATTRIBUTE_push(*sk,attr);
906                 }
907         else
908                 {
909                 int i;
910
911                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
912                         {
913                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
914                         if (OBJ_obj2nid(attr->object) == nid)
915                                 {
916                                 X509_ATTRIBUTE_free(attr);
917                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
918                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
919                                 goto end;
920                                 }
921                         }
922                 goto new_attrib;
923                 }
924 end:
925         return(1);
926         }
927