Various PKCS#7 related fixes,tidies and comments.
[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 **sk, int nid, int atrtype, void *value);
66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
67
68 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
69         {
70         int i,j;
71         BIO *out=NULL,*btmp=NULL;
72         X509_ALGOR *xa;
73         const EVP_MD *evp_md;
74         const EVP_CIPHER *evp_cipher=NULL;
75         STACK *md_sk=NULL,*rsk=NULL;
76         X509_ALGOR *xalg=NULL;
77         PKCS7_RECIP_INFO *ri=NULL;
78         EVP_PKEY *pkey;
79
80         i=OBJ_obj2nid(p7->type);
81         p7->state=PKCS7_S_HEADER;
82
83         switch (i)
84                 {
85         case NID_pkcs7_signed:
86                 md_sk=p7->d.sign->md_algs;
87                 break;
88         case NID_pkcs7_signedAndEnveloped:
89                 rsk=p7->d.signed_and_enveloped->recipientinfo;
90                 md_sk=p7->d.signed_and_enveloped->md_algs;
91                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
92                 if (evp_cipher == NULL)
93                         {
94                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
95                         goto err;
96                         }
97                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
98                 break;
99         case NID_pkcs7_enveloped:
100                 rsk=p7->d.enveloped->recipientinfo;
101                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
102                 if (evp_cipher == NULL)
103                         {
104                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
105                         goto err;
106                         }
107                 xalg=p7->d.enveloped->enc_data->algorithm;
108                 break;
109         default:
110                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
111                 goto err;
112                 }
113
114         if (md_sk != NULL)
115                 {
116                 for (i=0; i<sk_num(md_sk); i++)
117                         {
118                         xa=(X509_ALGOR *)sk_value(md_sk,i);
119                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
120                                 {
121                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
122                                 goto err;
123                                 }
124
125                         j=OBJ_obj2nid(xa->algorithm);
126                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
127                         if (evp_md == NULL)
128                                 {
129                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
130                                 goto err;
131                                 }
132
133                         BIO_set_md(btmp,evp_md);
134                         if (out == NULL)
135                                 out=btmp;
136                         else
137                                 BIO_push(out,btmp);
138                         btmp=NULL;
139                         }
140                 }
141
142         if (evp_cipher != NULL)
143                 {
144                 unsigned char key[EVP_MAX_KEY_LENGTH];
145                 unsigned char iv[EVP_MAX_IV_LENGTH];
146                 int keylen,ivlen;
147                 int jj,max;
148                 unsigned char *tmp;
149
150                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
151                         {
152                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
153                         goto err;
154                         }
155                 keylen=EVP_CIPHER_key_length(evp_cipher);
156                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
157
158                 if (ivlen > 0) {
159                         EVP_CIPHER_CTX *ctx;
160                         BIO_get_cipher_ctx(btmp, &ctx);
161                         if (xalg->parameter == NULL) 
162                                                 xalg->parameter=ASN1_TYPE_new();
163                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
164                                                                        goto err;
165                 }
166                 RAND_bytes(key,keylen);
167
168                 /* Lets do the pub key stuff :-) */
169                 max=0;
170                 for (i=0; i<sk_num(rsk); i++)
171                         {
172                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
173                         if (ri->cert == NULL)
174                                 {
175                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
176                                 goto err;
177                                 }
178                         pkey=X509_get_pubkey(ri->cert);
179                         jj=EVP_PKEY_size(pkey);
180                         EVP_PKEY_free(pkey);
181                         if (max < jj) max=jj;
182                         }
183                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
184                         {
185                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
186                         goto err;
187                         }
188                 for (i=0; i<sk_num(rsk); i++)
189                         {
190                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
191                         pkey=X509_get_pubkey(ri->cert);
192                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
193                         EVP_PKEY_free(pkey);
194                         if (jj <= 0)
195                                 {
196                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
197                                 Free(tmp);
198                                 goto err;
199                                 }
200                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
201                         }
202                 Free(tmp);
203
204                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
205
206                 if (out == NULL)
207                         out=btmp;
208                 else
209                         BIO_push(out,btmp);
210                 btmp=NULL;
211                 }
212
213         if (bio == NULL) /* ??????????? */
214                 {
215                 if (p7->detached)
216                         bio=BIO_new(BIO_s_null());
217                 else
218                         {
219                         bio=BIO_new(BIO_s_mem());
220                         /* We need to set this so that when we have read all
221                          * the data, the encrypt BIO, if present, will read
222                          * EOF and encode the last few bytes */
223                         BIO_set_mem_eof_return(bio,0);
224
225                         if (PKCS7_type_is_signed(p7) &&
226                                 PKCS7_type_is_data(p7->d.sign->contents))
227                                 {
228                                 ASN1_OCTET_STRING *os;
229
230                                 os=p7->d.sign->contents->d.data;
231                                 if (os->length > 0)
232                                         BIO_write(bio,(char *)os->data,
233                                                 os->length);
234                                 }
235                         }
236                 }
237         BIO_push(out,bio);
238         bio=NULL;
239         if (0)
240                 {
241 err:
242                 if (out != NULL)
243                         BIO_free_all(out);
244                 if (btmp != NULL)
245                         BIO_free_all(btmp);
246                 out=NULL;
247                 }
248         return(out);
249         }
250
251 /* int */
252 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio,
253              X509_STORE *xs)
254         {
255         int i,j;
256         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
257         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 *md_sk=NULL,*rsk=NULL;
265         X509_ALGOR *xalg=NULL;
266         PKCS7_RECIP_INFO *ri=NULL;
267 /*      EVP_PKEY *pkey; */
268 #if 0
269         X509_STORE_CTX s_ctx;
270 #endif
271
272         i=OBJ_obj2nid(p7->type);
273         p7->state=PKCS7_S_HEADER;
274
275         switch (i)
276                 {
277         case NID_pkcs7_signed:
278                 data_body=p7->d.sign->contents->d.data;
279                 md_sk=p7->d.sign->md_algs;
280                 break;
281         case NID_pkcs7_signedAndEnveloped:
282                 rsk=p7->d.signed_and_enveloped->recipientinfo;
283                 md_sk=p7->d.signed_and_enveloped->md_algs;
284                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
285                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
286                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
287                 if (evp_cipher == NULL)
288                         {
289                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
290                         goto err;
291                         }
292                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
293                 break;
294         case NID_pkcs7_enveloped:
295                 rsk=p7->d.enveloped->recipientinfo;
296                 enc_alg=p7->d.enveloped->enc_data->algorithm;
297                 data_body=p7->d.enveloped->enc_data->enc_data;
298                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
299                 if (evp_cipher == NULL)
300                         {
301                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
302                         goto err;
303                         }
304                 xalg=p7->d.enveloped->enc_data->algorithm;
305                 break;
306         default:
307                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
308                 goto err;
309                 }
310
311         /* We will be checking the signature */
312         if (md_sk != NULL)
313                 {
314                 for (i=0; i<sk_num(md_sk); i++)
315                         {
316                         xa=(X509_ALGOR *)sk_value(md_sk,i);
317                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
318                                 {
319                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
320                                 goto err;
321                                 }
322
323                         j=OBJ_obj2nid(xa->algorithm);
324                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
325                         if (evp_md == NULL)
326                                 {
327                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
328                                 goto err;
329                                 }
330
331                         BIO_set_md(btmp,evp_md);
332                         if (out == NULL)
333                                 out=btmp;
334                         else
335                                 BIO_push(out,btmp);
336                         btmp=NULL;
337                         }
338                 }
339
340         if (evp_cipher != NULL)
341                 {
342 #if 0
343                 unsigned char key[EVP_MAX_KEY_LENGTH];
344                 unsigned char iv[EVP_MAX_IV_LENGTH];
345                 unsigned char *p;
346                 int keylen,ivlen;
347                 int max;
348                 X509_OBJECT ret;
349 #endif
350                 int jj;
351
352                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
353                         {
354                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
355                         goto err;
356                         }
357
358                 /* It was encrypted, we need to decrypt the secret key
359                  * with the private key */
360
361                 /* We need to find a private key for one of the people in the
362                  * recipentinfo list */
363                 if (rsk == NULL)
364                         return(NULL);
365
366                 /* FIXME: this assumes that the passed private key
367                  * corresponds to the first RecipientInfo. This in
368                  * general is not true
369                  */
370
371                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
372 #if 0
373                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
374                 for (i=0; i<sk_num(rsk); i++)
375                         {
376                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
377                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
378                                 X509_LU_PKEY,
379                                 ri->issuer_and_serial->issuer,
380                                 ri->issuer_and_serial->serial,
381                                 &ret))
382                                 break;
383                         ri=NULL;
384                         }
385                 if (ri == NULL) return(NULL);   
386                 pkey=ret.data.pkey;
387 #endif
388                 if (pkey == NULL)
389                         {
390                         return(NULL);
391                         }
392
393                 jj=EVP_PKEY_size(pkey);
394                 tmp=Malloc(jj+10);
395                 if (tmp == NULL)
396                         {
397                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
398                         goto err;
399                         }
400
401                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
402                         ASN1_STRING_data(ri->enc_key),
403                         ASN1_STRING_length(ri->enc_key),
404                         pkey);
405                 if (jj <= 0)
406                         {
407                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
408                         goto err;
409                         }
410
411                 evp_ctx=NULL;
412                 BIO_get_cipher_ctx(etmp,&evp_ctx);
413                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
414                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
415                         return(NULL);
416
417                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
418                         {
419                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
420                         goto err;
421                         }
422                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
423
424                 memset(tmp,0,jj);
425
426                 if (out == NULL)
427                         out=etmp;
428                 else
429                         BIO_push(out,etmp);
430                 etmp=NULL;
431                 }
432
433 #if 1
434         if (p7->detached || (in_bio != NULL))
435                 {
436                 bio=in_bio;
437                 }
438         else 
439                 {
440                 bio=BIO_new(BIO_s_mem());
441                 /* We need to set this so that when we have read all
442                  * the data, the encrypt BIO, if present, will read
443                  * EOF and encode the last few bytes */
444                 BIO_set_mem_eof_return(bio,0);
445
446                 if (data_body->length > 0)
447                         BIO_write(bio,(char *)data_body->data,data_body->length);
448                 }
449         BIO_push(out,bio);
450         bio=NULL;
451 #endif
452         if (0)
453                 {
454 err:
455                 if (out != NULL) BIO_free_all(out);
456                 if (btmp != NULL) BIO_free_all(btmp);
457                 if (etmp != NULL) BIO_free_all(etmp);
458                 if (bio != NULL) BIO_free_all(bio);
459                 out=NULL;
460                 }
461         if (tmp != NULL)
462                 Free(tmp);
463         return(out);
464         }
465
466 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
467         {
468         int ret=0;
469         int i,j;
470         BIO *btmp;
471         BUF_MEM *buf_mem=NULL;
472         BUF_MEM *buf=NULL;
473         PKCS7_SIGNER_INFO *si;
474         EVP_MD_CTX *mdc,ctx_tmp;
475         STACK *sk,*si_sk=NULL;
476         unsigned char *p,*pp=NULL;
477         int x;
478         ASN1_OCTET_STRING *os=NULL;
479
480         i=OBJ_obj2nid(p7->type);
481         p7->state=PKCS7_S_HEADER;
482
483         switch (i)
484                 {
485         case NID_pkcs7_signedAndEnveloped:
486                 /* XXXXXXXXXXXXXXXX */
487                 si_sk=p7->d.signed_and_enveloped->signer_info;
488                 os=ASN1_OCTET_STRING_new();
489                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
490                 break;
491         case NID_pkcs7_enveloped:
492                 /* XXXXXXXXXXXXXXXX */
493                 os=ASN1_OCTET_STRING_new();
494                 p7->d.enveloped->enc_data->enc_data=os;
495                 break;
496         case NID_pkcs7_signed:
497                 si_sk=p7->d.sign->signer_info;
498                 os=p7->d.sign->contents->d.data;
499                 /* If detached data then the content is excluded */
500                 if(p7->detached) {
501                         ASN1_OCTET_STRING_free(os);
502                         p7->d.sign->contents->d.data = NULL;
503                 }
504                 break;
505                 }
506
507         if (si_sk != NULL)
508                 {
509                 if ((buf=BUF_MEM_new()) == NULL)
510                         {
511                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
512                         goto err;
513                         }
514                 for (i=0; i<sk_num(si_sk); i++)
515                         {
516                         si=(PKCS7_SIGNER_INFO *)
517                                 sk_value(si_sk,i);
518                         if (si->pkey == NULL) continue;
519
520                         j=OBJ_obj2nid(si->digest_alg->algorithm);
521
522                         btmp=bio;
523                         for (;;)
524                                 {
525                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
526                                         == NULL)
527                                         {
528                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
529                                         goto err;
530                                         }
531                                 BIO_get_md_ctx(btmp,&mdc);
532                                 if (mdc == NULL)
533                                         {
534                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
535                                         goto err;
536                                         }
537                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
538                                         break;
539                                 else
540                                         btmp=btmp->next_bio;
541                                 }
542                         
543                         /* We now have the EVP_MD_CTX, lets do the
544                          * signing. */
545                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
546                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
547                                 {
548                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
549                                 goto err;
550                                 }
551
552                         sk=si->auth_attr;
553
554                         /* If there are attributes, we add the digest
555                          * attribute and only sign the attributes */
556                         if ((sk != NULL) && (sk_num(sk) != 0))
557                                 {
558                                 unsigned char md_data[EVP_MAX_MD_SIZE];
559                                 unsigned int md_len;
560                                 ASN1_OCTET_STRING *digest;
561                                 ASN1_UTCTIME *sign_time;
562                                 const EVP_MD *md_tmp;
563
564                                 /* Add signing time */
565                                 sign_time=X509_gmtime_adj(NULL,0);
566                                 PKCS7_add_signed_attribute(si,
567                                         NID_pkcs9_signingTime,
568                                         V_ASN1_UTCTIME,sign_time);
569
570                                 /* Add digest */
571                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
572                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
573                                 digest=ASN1_OCTET_STRING_new();
574                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
575                                 PKCS7_add_signed_attribute(si,
576                                         NID_pkcs9_messageDigest,
577                                         V_ASN1_OCTET_STRING,digest);
578
579                                 /* Now sign the mess */
580                                 EVP_SignInit(&ctx_tmp,md_tmp);
581                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
582                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
583                                 pp=(unsigned char *)Malloc(x);
584                                 p=pp;
585                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
586                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
587                                 EVP_SignUpdate(&ctx_tmp,pp,x);
588                                 Free(pp);
589                                 pp=NULL;
590                                 }
591
592                         if (si->pkey->type == EVP_PKEY_DSA)
593                                 ctx_tmp.digest=EVP_dss1();
594
595                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
596                                 (unsigned int *)&buf->length,si->pkey))
597                                 {
598                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
599                                 goto err;
600                                 }
601                         if (!ASN1_STRING_set(si->enc_digest,
602                                 (unsigned char *)buf->data,buf->length))
603                                 {
604                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
605                                 goto err;
606                                 }
607                         }
608                 }
609
610         if (!p7->detached)
611                 {
612                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
613                 if (btmp == NULL)
614                         {
615                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
616                         goto err;
617                         }
618                 BIO_get_mem_ptr(btmp,&buf_mem);
619                 ASN1_OCTET_STRING_set(os,
620                         (unsigned char *)buf_mem->data,buf_mem->length);
621                 }
622         if (pp != NULL) Free(pp);
623         pp=NULL;
624
625         ret=1;
626 err:
627         if (buf != NULL) BUF_MEM_free(buf);
628         return(ret);
629         }
630
631 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
632              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
633         {
634 /*      PKCS7_SIGNED *s; */
635         ASN1_OCTET_STRING *os;
636         EVP_MD_CTX mdc_tmp,*mdc;
637         unsigned char *pp,*p;
638         PKCS7_ISSUER_AND_SERIAL *ias;
639         int ret=0,i;
640         int md_type;
641         STACK *sk;
642         STACK_OF(X509) *cert;
643         BIO *btmp;
644         X509 *x509;
645         EVP_PKEY *pkey;
646
647         if (PKCS7_type_is_signed(p7))
648                 {
649                 cert=p7->d.sign->cert;
650                 }
651         else if (PKCS7_type_is_signedAndEnveloped(p7))
652                 {
653                 cert=p7->d.signed_and_enveloped->cert;
654                 }
655         else
656                 {
657                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
658                 goto err;
659                 }
660         /* XXXXXXXXXXXXXXXXXXXXXXX */
661         ias=si->issuer_and_serial;
662
663         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
664
665         /* were we able to find the cert in passed to us */
666         if (x509 == NULL)
667                 {
668                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
669                 goto err;
670                 }
671
672         /* Lets verify */
673         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
674         i=X509_verify_cert(ctx);
675         if (i <= 0) 
676                 {
677                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
678                 goto err;
679                 }
680         X509_STORE_CTX_cleanup(ctx);
681
682         /* So we like 'x509', lets check the signature. */
683         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
684
685         btmp=bio;
686         for (;;)
687                 {
688                 if ((btmp == NULL) ||
689                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
690                         {
691                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
692                         goto err;
693                         }
694                 BIO_get_md_ctx(btmp,&mdc);
695                 if (mdc == NULL)
696                         {
697                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
698                         goto err;
699                         }
700                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
701                         break;
702                 btmp=btmp->next_bio;    
703                 }
704
705         /* mdc is the digest ctx that we want, unless there are attributes,
706          * in which case the digest is the signed attributes */
707         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
708
709         sk=si->auth_attr;
710         if ((sk != NULL) && (sk_num(sk) != 0))
711                 {
712                 unsigned char md_dat[EVP_MAX_MD_SIZE];
713                 unsigned int md_len;
714                 ASN1_OCTET_STRING *message_digest;
715
716                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
717                 message_digest=PKCS7_digest_from_attributes(sk);
718                 if (!message_digest)
719                         {
720                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
721                         goto err;
722                         }
723                 if ((message_digest->length != (int)md_len) ||
724                         (memcmp(message_digest->data,md_dat,md_len)))
725                         {
726 #if 0
727 {
728 int ii;
729 for (ii=0; ii<message_digest->length; ii++)
730         printf("%02X",message_digest->data[ii]); printf(" sent\n");
731 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
732 }
733 #endif
734                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
735                         ret= -1;
736                         goto err;
737                         }
738
739                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
740                 /* Note: when forming the encoding of the attributes we
741                  * shouldn't reorder them or this will break the signature.
742                  * This is done by using the IS_SEQUENCE flag.
743                  */
744                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
745                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
746                 pp=(unsigned char *)Malloc(i);
747                 p=pp;
748                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
749                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
750                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
751
752                 Free(pp);
753                 }
754
755         os=si->enc_digest;
756         pkey = X509_get_pubkey(x509);
757         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
758
759         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
760         EVP_PKEY_free(pkey);
761         if (i <= 0)
762                 {
763                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
764                 ret= -1;
765                 goto err;
766                 }
767         else
768                 ret=1;
769 err:
770         return(ret);
771         }
772
773 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
774         {
775         STACK *rsk;
776         PKCS7_RECIP_INFO *ri;
777         int i;
778
779         i=OBJ_obj2nid(p7->type);
780         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
781         rsk=p7->d.signed_and_enveloped->recipientinfo;
782         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
783         if (sk_num(rsk) <= idx) return(NULL);
784         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
785         return(ri->issuer_and_serial);
786         }
787
788 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
789         {
790         return(get_attribute(si->auth_attr,nid));
791         }
792
793 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
794         {
795         return(get_attribute(si->unauth_attr,nid));
796         }
797
798 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
799         {
800         int i;
801         X509_ATTRIBUTE *xa;
802         ASN1_OBJECT *o;
803
804         o=OBJ_nid2obj(nid);
805         if (!o || !sk) return(NULL);
806         for (i=0; i<sk_num(sk); i++)
807                 {
808                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
809                 if (OBJ_cmp(xa->object,o) == 0)
810                         {
811                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
812                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
813                         else
814                                 return(NULL);
815                         }
816                 }
817         return(NULL);
818         }
819
820 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
821 {
822         ASN1_TYPE *astype;
823         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
824         return astype->value.octet_string;
825 }
826
827 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
828         {
829         int i;
830
831         if (p7si->auth_attr != NULL)
832                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
833         p7si->auth_attr=sk_dup(sk);
834         for (i=0; i<sk_num(sk); i++)
835                 {
836                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
837                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
838                         return(0);
839                 }
840         return(1);
841         }
842
843 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
844         {
845         int i;
846
847         if (p7si->unauth_attr != NULL)
848                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
849         p7si->unauth_attr=sk_dup(sk);
850         for (i=0; i<sk_num(sk); i++)
851                 {
852                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
853                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
854                         return(0);
855                 }
856         return(1);
857         }
858
859 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
860              void *value)
861         {
862         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
863         }
864
865 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
866              void *value)
867         {
868         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
869         }
870
871 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
872         {
873         X509_ATTRIBUTE *attr=NULL;
874
875         if (*sk == NULL)
876                 {
877                 *sk = sk_new(NULL);
878 new_attrib:
879                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
880                 sk_push(*sk,(char *)attr);
881                 }
882         else
883                 {
884                 int i;
885
886                 for (i=0; i<sk_num(*sk); i++)
887                         {
888                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
889                         if (OBJ_obj2nid(attr->object) == nid)
890                                 {
891                                 X509_ATTRIBUTE_free(attr);
892                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
893                                 sk_value(*sk,i)=(char *)attr;
894                                 goto end;
895                                 }
896                         }
897                 goto new_attrib;
898                 }
899 end:
900         return(1);
901         }
902