4c32f053b7e0cfaaac8306c141e42b3d75f42ce9
[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
65 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
66                          void *value);
67 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
68
69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
70         {
71         int i,j;
72         BIO *out=NULL,*btmp=NULL;
73         X509_ALGOR *xa;
74         const EVP_MD *evp_md;
75         const EVP_CIPHER *evp_cipher=NULL;
76         STACK_OF(X509_ALGOR) *md_sk=NULL;
77         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
78         X509_ALGOR *xalg=NULL;
79         PKCS7_RECIP_INFO *ri=NULL;
80         EVP_PKEY *pkey;
81
82         i=OBJ_obj2nid(p7->type);
83         p7->state=PKCS7_S_HEADER;
84
85         switch (i)
86                 {
87         case NID_pkcs7_signed:
88                 md_sk=p7->d.sign->md_algs;
89                 break;
90         case NID_pkcs7_signedAndEnveloped:
91                 rsk=p7->d.signed_and_enveloped->recipientinfo;
92                 md_sk=p7->d.signed_and_enveloped->md_algs;
93                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
94                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
95                 if (evp_cipher == NULL)
96                         {
97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
98                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
99                         goto err;
100                         }
101                 break;
102         case NID_pkcs7_enveloped:
103                 rsk=p7->d.enveloped->recipientinfo;
104                 xalg=p7->d.enveloped->enc_data->algorithm;
105                 evp_cipher=p7->d.enveloped->enc_data->cipher;
106                 if (evp_cipher == NULL)
107                         {
108                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
109                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
110                         goto err;
111                         }
112                 break;
113         default:
114                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
115                 goto err;
116                 }
117
118         if (md_sk != NULL)
119                 {
120                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
121                         {
122                         xa=sk_X509_ALGOR_value(md_sk,i);
123                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
124                                 {
125                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
126                                 goto err;
127                                 }
128
129                         j=OBJ_obj2nid(xa->algorithm);
130                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
131                         if (evp_md == NULL)
132                                 {
133                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
134                                 goto err;
135                                 }
136
137                         BIO_set_md(btmp,evp_md);
138                         if (out == NULL)
139                                 out=btmp;
140                         else
141                                 BIO_push(out,btmp);
142                         btmp=NULL;
143                         }
144                 }
145
146         if (evp_cipher != NULL)
147                 {
148                 unsigned char key[EVP_MAX_KEY_LENGTH];
149                 unsigned char iv[EVP_MAX_IV_LENGTH];
150                 int keylen,ivlen;
151                 int jj,max;
152                 unsigned char *tmp;
153                 EVP_CIPHER_CTX *ctx;
154
155                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
156                         {
157                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
158                         goto err;
159                         }
160                 BIO_get_cipher_ctx(btmp, &ctx);
161                 keylen=EVP_CIPHER_key_length(evp_cipher);
162                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
163                 RAND_bytes(key,keylen);
164                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
165                 if (ivlen > 0) RAND_bytes(iv,ivlen);
166                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
167
168                 if (ivlen > 0) {
169                         if (xalg->parameter == NULL) 
170                                                 xalg->parameter=ASN1_TYPE_new();
171                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
172                                                                        goto err;
173                 }
174
175                 /* Lets do the pub key stuff :-) */
176                 max=0;
177                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
178                         {
179                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
180                         if (ri->cert == NULL)
181                                 {
182                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
183                                 goto err;
184                                 }
185                         pkey=X509_get_pubkey(ri->cert);
186                         jj=EVP_PKEY_size(pkey);
187                         EVP_PKEY_free(pkey);
188                         if (max < jj) max=jj;
189                         }
190                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
191                         {
192                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
193                         goto err;
194                         }
195                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
196                         {
197                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
198                         pkey=X509_get_pubkey(ri->cert);
199                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
200                         EVP_PKEY_free(pkey);
201                         if (jj <= 0)
202                                 {
203                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
204                                 Free(tmp);
205                                 goto err;
206                                 }
207                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
208                         }
209                 Free(tmp);
210                 memset(key, 0, keylen);
211
212                 if (out == NULL)
213                         out=btmp;
214                 else
215                         BIO_push(out,btmp);
216                 btmp=NULL;
217                 }
218
219         if (bio == NULL) {
220                 if (p7->detached)
221                         bio=BIO_new(BIO_s_null());
222                 else {
223                         if (PKCS7_type_is_signed(p7) &&
224                                 PKCS7_type_is_data(p7->d.sign->contents)) {
225                                 ASN1_OCTET_STRING *os;
226                                 os=p7->d.sign->contents->d.data;
227                                 if (os->length > 0) bio = 
228                                         BIO_new_mem_buf(os->data, os->length);
229                         } else {
230                                 bio=BIO_new(BIO_s_mem());
231                                 BIO_set_mem_eof_return(bio,0);
232                         }
233                 }
234         }
235         BIO_push(out,bio);
236         bio=NULL;
237         if (0)
238                 {
239 err:
240                 if (out != NULL)
241                         BIO_free_all(out);
242                 if (btmp != NULL)
243                         BIO_free_all(btmp);
244                 out=NULL;
245                 }
246         return(out);
247         }
248
249 /* int */
250 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
251         {
252         int i,j;
253         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
254         unsigned char *tmp=NULL;
255         X509_ALGOR *xa;
256         ASN1_OCTET_STRING *data_body=NULL;
257         const EVP_MD *evp_md;
258         const EVP_CIPHER *evp_cipher=NULL;
259         EVP_CIPHER_CTX *evp_ctx=NULL;
260         X509_ALGOR *enc_alg=NULL;
261         STACK_OF(X509_ALGOR) *md_sk=NULL;
262         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
263         X509_ALGOR *xalg=NULL;
264         PKCS7_RECIP_INFO *ri=NULL;
265         char is_rc2 = 0;
266 /*      EVP_PKEY *pkey; */
267 #if 0
268         X509_STORE_CTX s_ctx;
269 #endif
270
271         i=OBJ_obj2nid(p7->type);
272         p7->state=PKCS7_S_HEADER;
273
274         switch (i)
275                 {
276         case NID_pkcs7_signed:
277                 data_body=p7->d.sign->contents->d.data;
278                 md_sk=p7->d.sign->md_algs;
279                 break;
280         case NID_pkcs7_signedAndEnveloped:
281                 rsk=p7->d.signed_and_enveloped->recipientinfo;
282                 md_sk=p7->d.signed_and_enveloped->md_algs;
283                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
284                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
285                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
286                 if (evp_cipher == NULL)
287                         {
288                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
289                         goto err;
290                         }
291                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
292                 break;
293         case NID_pkcs7_enveloped:
294                 rsk=p7->d.enveloped->recipientinfo;
295                 enc_alg=p7->d.enveloped->enc_data->algorithm;
296                 data_body=p7->d.enveloped->enc_data->enc_data;
297                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
298                 if (evp_cipher == NULL)
299                         {
300                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
301                         goto err;
302                         }
303                 xalg=p7->d.enveloped->enc_data->algorithm;
304                 break;
305         default:
306                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
307                 goto err;
308                 }
309
310         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1; 
311
312         /* We will be checking the signature */
313         if (md_sk != NULL)
314                 {
315                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
316                         {
317                         xa=sk_X509_ALGOR_value(md_sk,i);
318                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
319                                 {
320                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
321                                 goto err;
322                                 }
323
324                         j=OBJ_obj2nid(xa->algorithm);
325                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
326                         if (evp_md == NULL)
327                                 {
328                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
329                                 goto err;
330                                 }
331
332                         BIO_set_md(btmp,evp_md);
333                         if (out == NULL)
334                                 out=btmp;
335                         else
336                                 BIO_push(out,btmp);
337                         btmp=NULL;
338                         }
339                 }
340
341         if (evp_cipher != NULL)
342                 {
343 #if 0
344                 unsigned char key[EVP_MAX_KEY_LENGTH];
345                 unsigned char iv[EVP_MAX_IV_LENGTH];
346                 unsigned char *p;
347                 int keylen,ivlen;
348                 int max;
349                 X509_OBJECT ret;
350 #endif
351                 int jj;
352
353                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
354                         {
355                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
356                         goto err;
357                         }
358
359                 /* It was encrypted, we need to decrypt the secret key
360                  * with the private key */
361
362                 /* Find the recipientInfo which matches the passed certificate
363                  * (if any)
364                  */
365
366                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
367                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
368                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
369                                         pcert->cert_info->issuer) &&
370                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
371                                         ri->issuer_and_serial->serial)) break;
372                         ri=NULL;
373                 }
374                 if (ri == NULL) {
375                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
376                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
377                         return(NULL);
378                 }
379
380                 jj=EVP_PKEY_size(pkey);
381                 tmp=(unsigned char *)Malloc(jj+10);
382                 if (tmp == NULL)
383                         {
384                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
385                         goto err;
386                         }
387
388                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
389                         M_ASN1_STRING_length(ri->enc_key), pkey);
390                 if (jj <= 0)
391                         {
392                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
393                         goto err;
394                         }
395
396                 evp_ctx=NULL;
397                 BIO_get_cipher_ctx(etmp,&evp_ctx);
398                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
399                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
400                         return(NULL);
401
402                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
403                         /* HACK: some S/MIME clients don't use the same key
404                          * and effective key length. The key length is
405                          * determined by the size of the decrypted RSA key.
406                          * So we hack things to manually set the RC2 key
407                          * because we currently can't do this with the EVP
408                          * interface.
409                          */
410                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
411                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
412                         else {
413
414                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
415                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
416                                 goto err;
417                         }
418                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
419
420                 memset(tmp,0,jj);
421
422                 if (out == NULL)
423                         out=etmp;
424                 else
425                         BIO_push(out,etmp);
426                 etmp=NULL;
427                 }
428
429 #if 1
430         if (p7->detached || (in_bio != NULL))
431                 {
432                 bio=in_bio;
433                 }
434         else 
435                 {
436 #if 0
437                 bio=BIO_new(BIO_s_mem());
438                 /* We need to set this so that when we have read all
439                  * the data, the encrypt BIO, if present, will read
440                  * EOF and encode the last few bytes */
441                 BIO_set_mem_eof_return(bio,0);
442
443                 if (data_body->length > 0)
444                         BIO_write(bio,(char *)data_body->data,data_body->length);
445 #else
446                 if (data_body->length > 0)
447                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
448                 else {
449                         bio=BIO_new(BIO_s_mem());
450                         BIO_set_mem_eof_return(bio,0);
451                 }
452 #endif
453                 }
454         BIO_push(out,bio);
455         bio=NULL;
456 #endif
457         if (0)
458                 {
459 err:
460                 if (out != NULL) BIO_free_all(out);
461                 if (btmp != NULL) BIO_free_all(btmp);
462                 if (etmp != NULL) BIO_free_all(etmp);
463                 if (bio != NULL) BIO_free_all(bio);
464                 out=NULL;
465                 }
466         if (tmp != NULL)
467                 Free(tmp);
468         return(out);
469         }
470
471 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
472         {
473         int ret=0;
474         int i,j;
475         BIO *btmp;
476         BUF_MEM *buf_mem=NULL;
477         BUF_MEM *buf=NULL;
478         PKCS7_SIGNER_INFO *si;
479         EVP_MD_CTX *mdc,ctx_tmp;
480         STACK_OF(X509_ATTRIBUTE) *sk;
481         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
482         unsigned char *p,*pp=NULL;
483         int x;
484         ASN1_OCTET_STRING *os=NULL;
485
486         i=OBJ_obj2nid(p7->type);
487         p7->state=PKCS7_S_HEADER;
488
489         switch (i)
490                 {
491         case NID_pkcs7_signedAndEnveloped:
492                 /* XXXXXXXXXXXXXXXX */
493                 si_sk=p7->d.signed_and_enveloped->signer_info;
494                 os=M_ASN1_OCTET_STRING_new();
495                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
496                 break;
497         case NID_pkcs7_enveloped:
498                 /* XXXXXXXXXXXXXXXX */
499                 os=M_ASN1_OCTET_STRING_new();
500                 p7->d.enveloped->enc_data->enc_data=os;
501                 break;
502         case NID_pkcs7_signed:
503                 si_sk=p7->d.sign->signer_info;
504                 os=p7->d.sign->contents->d.data;
505                 /* If detached data then the content is excluded */
506                 if(p7->detached) {
507                         M_ASN1_OCTET_STRING_free(os);
508                         p7->d.sign->contents->d.data = NULL;
509                 }
510                 break;
511                 }
512
513         if (si_sk != NULL)
514                 {
515                 if ((buf=BUF_MEM_new()) == NULL)
516                         {
517                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
518                         goto err;
519                         }
520                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
521                         {
522                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
523                         if (si->pkey == NULL) continue;
524
525                         j=OBJ_obj2nid(si->digest_alg->algorithm);
526
527                         btmp=bio;
528                         for (;;)
529                                 {
530                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
531                                         == NULL)
532                                         {
533                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
534                                         goto err;
535                                         }
536                                 BIO_get_md_ctx(btmp,&mdc);
537                                 if (mdc == NULL)
538                                         {
539                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
540                                         goto err;
541                                         }
542                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
543                                         break;
544                                 else
545                                         btmp=btmp->next_bio;
546                                 }
547                         
548                         /* We now have the EVP_MD_CTX, lets do the
549                          * signing. */
550                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
551                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
552                                 {
553                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
554                                 goto err;
555                                 }
556
557                         sk=si->auth_attr;
558
559                         /* If there are attributes, we add the digest
560                          * attribute and only sign the attributes */
561                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
562                                 {
563                                 unsigned char md_data[EVP_MAX_MD_SIZE];
564                                 unsigned int md_len;
565                                 ASN1_OCTET_STRING *digest;
566                                 ASN1_UTCTIME *sign_time;
567                                 const EVP_MD *md_tmp;
568
569                                 /* Add signing time */
570                                 sign_time=X509_gmtime_adj(NULL,0);
571                                 PKCS7_add_signed_attribute(si,
572                                         NID_pkcs9_signingTime,
573                                         V_ASN1_UTCTIME,sign_time);
574
575                                 /* Add digest */
576                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
577                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
578                                 digest=M_ASN1_OCTET_STRING_new();
579                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
580                                 PKCS7_add_signed_attribute(si,
581                                         NID_pkcs9_messageDigest,
582                                         V_ASN1_OCTET_STRING,digest);
583
584                                 /* Now sign the mess */
585                                 EVP_SignInit(&ctx_tmp,md_tmp);
586                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
587                                            i2d_X509_ATTRIBUTE,
588                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
589                                 pp=(unsigned char *)Malloc(x);
590                                 p=pp;
591                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
592                                            i2d_X509_ATTRIBUTE,
593                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
594                                 EVP_SignUpdate(&ctx_tmp,pp,x);
595                                 Free(pp);
596                                 pp=NULL;
597                                 }
598
599                         if (si->pkey->type == EVP_PKEY_DSA)
600                                 ctx_tmp.digest=EVP_dss1();
601
602                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
603                                 (unsigned int *)&buf->length,si->pkey))
604                                 {
605                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
606                                 goto err;
607                                 }
608                         if (!ASN1_STRING_set(si->enc_digest,
609                                 (unsigned char *)buf->data,buf->length))
610                                 {
611                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
612                                 goto err;
613                                 }
614                         }
615                 }
616
617         if (!p7->detached)
618                 {
619                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
620                 if (btmp == NULL)
621                         {
622                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
623                         goto err;
624                         }
625                 BIO_get_mem_ptr(btmp,&buf_mem);
626                 /* Mark the BIO read only then we can use its copy of the data
627                  * instead of making an extra copy.
628                  */
629                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
630                 BIO_set_mem_eof_return(btmp, 0);
631                 os->data = (unsigned char *)buf_mem->data;
632                 os->length = buf_mem->length;
633 #if 0
634                 M_ASN1_OCTET_STRING_set(os,
635                         (unsigned char *)buf_mem->data,buf_mem->length);
636 #endif
637                 }
638         if (pp != NULL) Free(pp);
639         pp=NULL;
640
641         ret=1;
642 err:
643         if (buf != NULL) BUF_MEM_free(buf);
644         return(ret);
645         }
646
647 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
648              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
649         {
650         PKCS7_ISSUER_AND_SERIAL *ias;
651         int ret=0,i;
652         STACK_OF(X509) *cert;
653         X509 *x509;
654
655         if (PKCS7_type_is_signed(p7))
656                 {
657                 cert=p7->d.sign->cert;
658                 }
659         else if (PKCS7_type_is_signedAndEnveloped(p7))
660                 {
661                 cert=p7->d.signed_and_enveloped->cert;
662                 }
663         else
664                 {
665                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
666                 goto err;
667                 }
668         /* XXXXXXXXXXXXXXXXXXXXXXX */
669         ias=si->issuer_and_serial;
670
671         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
672
673         /* were we able to find the cert in passed to us */
674         if (x509 == NULL)
675                 {
676                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
677                 goto err;
678                 }
679
680         /* Lets verify */
681         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
682         i=X509_verify_cert(ctx);
683         if (i <= 0) 
684                 {
685                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
686                 goto err;
687                 }
688         X509_STORE_CTX_cleanup(ctx);
689
690         return PKCS7_signatureVerify(bio, p7, si, x509);
691         err:
692         return ret;
693         }
694
695 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
696                                                                 X509 *x509)
697         {
698         ASN1_OCTET_STRING *os;
699         EVP_MD_CTX mdc_tmp,*mdc;
700         unsigned char *pp,*p;
701         int ret=0,i;
702         int md_type;
703         STACK_OF(X509_ATTRIBUTE) *sk;
704         BIO *btmp;
705         EVP_PKEY *pkey;
706
707         if (!PKCS7_type_is_signed(p7) && 
708                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
709                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
710                                                 PKCS7_R_WRONG_PKCS7_TYPE);
711                 goto err;
712         }
713
714         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
715
716         btmp=bio;
717         for (;;)
718                 {
719                 if ((btmp == NULL) ||
720                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
721                         {
722                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
723                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
724                         goto err;
725                         }
726                 BIO_get_md_ctx(btmp,&mdc);
727                 if (mdc == NULL)
728                         {
729                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
730                                                         PKCS7_R_INTERNAL_ERROR);
731                         goto err;
732                         }
733                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
734                         break;
735                 btmp=btmp->next_bio;    
736                 }
737
738         /* mdc is the digest ctx that we want, unless there are attributes,
739          * in which case the digest is the signed attributes */
740         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
741
742         sk=si->auth_attr;
743         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
744                 {
745                 unsigned char md_dat[EVP_MAX_MD_SIZE];
746                 unsigned int md_len;
747                 ASN1_OCTET_STRING *message_digest;
748
749                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
750                 message_digest=PKCS7_digest_from_attributes(sk);
751                 if (!message_digest)
752                         {
753                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
754                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
755                         goto err;
756                         }
757                 if ((message_digest->length != (int)md_len) ||
758                         (memcmp(message_digest->data,md_dat,md_len)))
759                         {
760 #if 0
761 {
762 int ii;
763 for (ii=0; ii<message_digest->length; ii++)
764         printf("%02X",message_digest->data[ii]); printf(" sent\n");
765 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
766 }
767 #endif
768                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
769                                                         PKCS7_R_DIGEST_FAILURE);
770                         ret= -1;
771                         goto err;
772                         }
773
774                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
775                 /* Note: when forming the encoding of the attributes we
776                  * shouldn't reorder them or this will break the signature.
777                  * This is done by using the IS_SEQUENCE flag.
778                  */
779                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
780                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
781                 pp=Malloc(i);
782                 p=pp;
783                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
784                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
785                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
786
787                 Free(pp);
788                 }
789
790         os=si->enc_digest;
791         pkey = X509_get_pubkey(x509);
792         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
793
794         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
795         EVP_PKEY_free(pkey);
796         if (i <= 0)
797                 {
798                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
799                                                 PKCS7_R_SIGNATURE_FAILURE);
800                 ret= -1;
801                 goto err;
802                 }
803         else
804                 ret=1;
805 err:
806         return(ret);
807         }
808
809 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
810         {
811         STACK_OF(PKCS7_RECIP_INFO) *rsk;
812         PKCS7_RECIP_INFO *ri;
813         int i;
814
815         i=OBJ_obj2nid(p7->type);
816         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
817         rsk=p7->d.signed_and_enveloped->recipientinfo;
818         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
819         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
820         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
821         return(ri->issuer_and_serial);
822         }
823
824 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
825         {
826         return(get_attribute(si->auth_attr,nid));
827         }
828
829 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
830         {
831         return(get_attribute(si->unauth_attr,nid));
832         }
833
834 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
835         {
836         int i;
837         X509_ATTRIBUTE *xa;
838         ASN1_OBJECT *o;
839
840         o=OBJ_nid2obj(nid);
841         if (!o || !sk) return(NULL);
842         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
843                 {
844                 xa=sk_X509_ATTRIBUTE_value(sk,i);
845                 if (OBJ_cmp(xa->object,o) == 0)
846                         {
847                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
848                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
849                         else
850                                 return(NULL);
851                         }
852                 }
853         return(NULL);
854         }
855
856 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
857 {
858         ASN1_TYPE *astype;
859         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
860         return astype->value.octet_string;
861 }
862
863 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
864                                 STACK_OF(X509_ATTRIBUTE) *sk)
865         {
866         int i;
867
868         if (p7si->auth_attr != NULL)
869                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
870         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
871         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
872                 {
873                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
874                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
875                     == NULL)
876                         return(0);
877                 }
878         return(1);
879         }
880
881 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
882         {
883         int i;
884
885         if (p7si->unauth_attr != NULL)
886                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
887                                            X509_ATTRIBUTE_free);
888         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
889         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
890                 {
891                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
892                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
893                     == NULL)
894                         return(0);
895                 }
896         return(1);
897         }
898
899 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
900              void *value)
901         {
902         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
903         }
904
905 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
906              void *value)
907         {
908         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
909         }
910
911 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
912                          void *value)
913         {
914         X509_ATTRIBUTE *attr=NULL;
915
916         if (*sk == NULL)
917                 {
918                 *sk = sk_X509_ATTRIBUTE_new(NULL);
919 new_attrib:
920                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
921                 sk_X509_ATTRIBUTE_push(*sk,attr);
922                 }
923         else
924                 {
925                 int i;
926
927                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
928                         {
929                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
930                         if (OBJ_obj2nid(attr->object) == nid)
931                                 {
932                                 X509_ATTRIBUTE_free(attr);
933                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
934                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
935                                 goto end;
936                                 }
937                         }
938                 goto new_attrib;
939                 }
940 end:
941         return(1);
942         }
943