071ff099377c284454d99fbd3d6b1fead84cba3d
[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 "rand.h"
62 #include "objects.h"
63 #include "x509.h"
64
65 static int add_attribute(STACK **sk, int nid, int atrtype, char *value);
66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
67
68 #if 1
69 BIO *PKCS7_dataInit(p7,bio)
70 PKCS7 *p7;
71 BIO *bio;
72         {
73         int i,j;
74         BIO *out=NULL,*btmp=NULL;
75         X509_ALGOR *xa;
76         EVP_MD *evp_md;
77         EVP_CIPHER *evp_cipher=NULL;
78         STACK *md_sk=NULL,*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                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
95                 if (evp_cipher == NULL)
96                         {
97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
98                         goto err;
99                         }
100                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
101                 break;
102         case NID_pkcs7_enveloped:
103                 rsk=p7->d.enveloped->recipientinfo;
104                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
105                 if (evp_cipher == NULL)
106                         {
107                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
108                         goto err;
109                         }
110                 xalg=p7->d.enveloped->enc_data->algorithm;
111                 break;
112         default:
113                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
114                 goto err;
115                 }
116
117         if (md_sk != NULL)
118                 {
119                 for (i=0; i<sk_num(md_sk); i++)
120                         {
121                         xa=(X509_ALGOR *)sk_value(md_sk,i);
122                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
123                                 {
124                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
125                                 goto err;
126                                 }
127
128                         j=OBJ_obj2nid(xa->algorithm);
129                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
130                         if (evp_md == NULL)
131                                 {
132                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
133                                 goto err;
134                                 }
135
136                         BIO_set_md(btmp,evp_md);
137                         if (out == NULL)
138                                 out=btmp;
139                         else
140                                 BIO_push(out,btmp);
141                         btmp=NULL;
142                         }
143                 }
144
145         if (evp_cipher != NULL)
146                 {
147                 unsigned char key[EVP_MAX_KEY_LENGTH];
148                 unsigned char iv[EVP_MAX_IV_LENGTH];
149                 int keylen,ivlen;
150                 int jj,max;
151                 unsigned char *tmp;
152
153                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
154                         {
155                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
156                         goto err;
157                         }
158                 keylen=EVP_CIPHER_key_length(evp_cipher);
159                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
160
161                 if (ivlen > 0)
162                         {
163                         ASN1_OCTET_STRING *os;
164
165                         RAND_bytes(iv,ivlen);
166                         os=ASN1_OCTET_STRING_new();
167                         ASN1_OCTET_STRING_set(os,iv,ivlen);
168 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX this needs to change */
169                         if (xalg->parameter == NULL)
170                                 xalg->parameter=ASN1_TYPE_new();
171                         ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
172                                 (char *)os);
173                         }
174                 RAND_bytes(key,keylen);
175
176                 /* Lets do the pub key stuff :-) */
177                 max=0;
178                 for (i=0; i<sk_num(rsk); i++)
179                         {
180                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
181                         if (ri->cert == NULL)
182                                 {
183                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
184                                 goto err;
185                                 }
186                         pkey=X509_get_pubkey(ri->cert);
187                         jj=EVP_PKEY_size(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_num(rsk); i++)
196                         {
197                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
198                         pkey=X509_get_pubkey(ri->cert);
199                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
200                         if (jj <= 0)
201                                 {
202                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
203                                 Free(tmp);
204                                 goto err;
205                                 }
206                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
207                         }
208                 Free(tmp);
209
210                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
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                 {
221                 if (p7->detached)
222                         bio=BIO_new(BIO_s_null());
223                 else
224                         {
225                         bio=BIO_new(BIO_s_mem());
226                         /* We need to set this so that when we have read all
227                          * the data, the encrypt BIO, if present, will read
228                          * EOF and encode the last few bytes */
229                         BIO_set_mem_eof_return(bio,0);
230
231                         if (PKCS7_type_is_signed(p7) &&
232                                 PKCS7_type_is_data(p7->d.sign->contents))
233                                 {
234                                 ASN1_OCTET_STRING *os;
235
236                                 os=p7->d.sign->contents->d.data;
237                                 if (os->length > 0)
238                                         BIO_write(bio,(char *)os->data,
239                                                 os->length);
240                                 }
241                         }
242                 }
243         BIO_push(out,bio);
244         bio=NULL;
245         if (0)
246                 {
247 err:
248                 if (out != NULL)
249                         BIO_free_all(out);
250                 if (btmp != NULL)
251                         BIO_free_all(btmp);
252                 out=NULL;
253                 }
254         return(out);
255         }
256
257 /* int */
258 BIO *PKCS7_dataDecode(p7,pkey,in_bio,xs)
259 PKCS7 *p7;
260 EVP_PKEY *pkey;
261 BIO *in_bio;
262 X509_STORE *xs;
263         {
264         int i,j;
265         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
266         char *tmp=NULL;
267         X509_ALGOR *xa;
268         ASN1_OCTET_STRING *data_body=NULL;
269         EVP_MD *evp_md;
270         EVP_CIPHER *evp_cipher=NULL;
271         EVP_CIPHER_CTX *evp_ctx=NULL;
272         X509_ALGOR *enc_alg=NULL;
273         STACK *md_sk=NULL,*rsk=NULL;
274         X509_ALGOR *xalg=NULL;
275         PKCS7_RECIP_INFO *ri=NULL;
276 /*      EVP_PKEY *pkey; */
277 #if 0
278         X509_STORE_CTX s_ctx;
279 #endif
280
281         i=OBJ_obj2nid(p7->type);
282         p7->state=PKCS7_S_HEADER;
283
284         switch (i)
285                 {
286         case NID_pkcs7_signed:
287                 data_body=p7->d.sign->contents->d.data;
288                 md_sk=p7->d.sign->md_algs;
289                 break;
290         case NID_pkcs7_signedAndEnveloped:
291                 rsk=p7->d.signed_and_enveloped->recipientinfo;
292                 md_sk=p7->d.signed_and_enveloped->md_algs;
293                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
294                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
295                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
296                 if (evp_cipher == NULL)
297                         {
298                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
299                         goto err;
300                         }
301                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
302                 break;
303         case NID_pkcs7_enveloped:
304                 rsk=p7->d.enveloped->recipientinfo;
305                 enc_alg=p7->d.enveloped->enc_data->algorithm;
306                 data_body=p7->d.enveloped->enc_data->enc_data;
307                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
308                 if (evp_cipher == NULL)
309                         {
310                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
311                         goto err;
312                         }
313                 xalg=p7->d.enveloped->enc_data->algorithm;
314                 break;
315         default:
316                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
317                 goto err;
318                 }
319
320         /* We will be checking the signature */
321         if (md_sk != NULL)
322                 {
323                 for (i=0; i<sk_num(md_sk); i++)
324                         {
325                         xa=(X509_ALGOR *)sk_value(md_sk,i);
326                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
327                                 {
328                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
329                                 goto err;
330                                 }
331
332                         j=OBJ_obj2nid(xa->algorithm);
333                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
334                         if (evp_md == NULL)
335                                 {
336                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
337                                 goto err;
338                                 }
339
340                         BIO_set_md(btmp,evp_md);
341                         if (out == NULL)
342                                 out=btmp;
343                         else
344                                 BIO_push(out,btmp);
345                         btmp=NULL;
346                         }
347                 }
348
349         if (evp_cipher != NULL)
350                 {
351 #if 0
352                 unsigned char key[EVP_MAX_KEY_LENGTH];
353                 unsigned char iv[EVP_MAX_IV_LENGTH];
354                 unsigned char *p;
355                 int keylen,ivlen;
356                 int max;
357                 X509_OBJECT ret;
358 #endif
359                 int jj;
360
361                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
362                         {
363                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
364                         goto err;
365                         }
366
367                 /* It was encrypted, we need to decrypt the secret key
368                  * with the private key */
369
370                 /* We need to find a private key for one of the people in the
371                  * recipentinfo list */
372                 if (rsk == NULL)
373                         return(NULL);
374
375                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
376 #if 0
377                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
378                 for (i=0; i<sk_num(rsk); i++)
379                         {
380                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
381                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
382                                 X509_LU_PKEY,
383                                 ri->issuer_and_serial->issuer,
384                                 ri->issuer_and_serial->serial,
385                                 &ret))
386                                 break;
387                         ri=NULL;
388                         }
389                 if (ri == NULL) return(NULL);   
390                 pkey=ret.data.pkey;
391 #endif
392                 if (pkey == NULL)
393                         {
394                         return(NULL);
395                         }
396
397                 jj=EVP_PKEY_size(pkey);
398                 tmp=Malloc(jj+10);
399                 if (tmp == NULL)
400                         {
401                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
402                         goto err;
403                         }
404
405                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
406                         ASN1_STRING_data(ri->enc_key),
407                         ASN1_STRING_length(ri->enc_key),
408                         pkey);
409                 if (jj <= 0)
410                         {
411                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
412                         goto err;
413                         }
414
415                 evp_ctx=NULL;
416                 BIO_get_cipher_ctx(etmp,&evp_ctx);
417                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
418                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
419                         return(NULL);
420
421                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
422                         {
423                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
424                         goto err;
425                         }
426                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
427
428                 memset(tmp,0,jj);
429
430                 if (out == NULL)
431                         out=etmp;
432                 else
433                         BIO_push(out,etmp);
434                 etmp=NULL;
435                 }
436
437 #if 1
438         if (p7->detached || (in_bio != NULL))
439                 {
440                 bio=in_bio;
441                 }
442         else 
443                 {
444                 bio=BIO_new(BIO_s_mem());
445                 /* We need to set this so that when we have read all
446                  * the data, the encrypt BIO, if present, will read
447                  * EOF and encode the last few bytes */
448                 BIO_set_mem_eof_return(bio,0);
449
450                 if (data_body->length > 0)
451                         BIO_write(bio,(char *)data_body->data,data_body->length);
452                 }
453         BIO_push(out,bio);
454         bio=NULL;
455 #endif
456         if (0)
457                 {
458 err:
459                 if (out != NULL) BIO_free_all(out);
460                 if (btmp != NULL) BIO_free_all(btmp);
461                 if (etmp != NULL) BIO_free_all(etmp);
462                 if (bio != NULL) BIO_free_all(bio);
463                 out=NULL;
464                 }
465         if (tmp != NULL)
466                 Free(tmp);
467         return(out);
468         }
469 #endif
470
471 int PKCS7_dataFinal(p7,bio)
472 PKCS7 *p7;
473 BIO *bio;
474         {
475         int ret=0;
476         int i,j;
477         BIO *btmp;
478         BUF_MEM *buf_mem=NULL;
479         BUF_MEM *buf=NULL;
480         PKCS7_SIGNER_INFO *si;
481         EVP_MD_CTX *mdc,ctx_tmp;
482         STACK *sk,*si_sk=NULL;
483         unsigned char *p,*pp=NULL;
484         int x;
485         ASN1_OCTET_STRING *os=NULL;
486
487         i=OBJ_obj2nid(p7->type);
488         p7->state=PKCS7_S_HEADER;
489
490         switch (i)
491                 {
492         case NID_pkcs7_signedAndEnveloped:
493                 /* XXXXXXXXXXXXXXXX */
494                 si_sk=p7->d.signed_and_enveloped->signer_info;
495                 os=ASN1_OCTET_STRING_new();
496                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
497                 break;
498         case NID_pkcs7_enveloped:
499                 /* XXXXXXXXXXXXXXXX */
500                 os=ASN1_OCTET_STRING_new();
501                 p7->d.enveloped->enc_data->enc_data=os;
502                 break;
503         case NID_pkcs7_signed:
504                 si_sk=p7->d.sign->signer_info;
505                 os=p7->d.sign->contents->d.data;
506                 break;
507                 }
508
509         if (si_sk != NULL)
510                 {
511                 if ((buf=BUF_MEM_new()) == NULL)
512                         {
513                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
514                         goto err;
515                         }
516                 for (i=0; i<sk_num(si_sk); i++)
517                         {
518                         si=(PKCS7_SIGNER_INFO *)
519                                 sk_value(si_sk,i);
520                         if (si->pkey == NULL) continue;
521
522                         j=OBJ_obj2nid(si->digest_alg->algorithm);
523
524                         btmp=bio;
525                         for (;;)
526                                 {
527                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
528                                         == NULL)
529                                         {
530                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
531                                         goto err;
532                                         }
533                                 BIO_get_md_ctx(btmp,&mdc);
534                                 if (mdc == NULL)
535                                         {
536                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
537                                         goto err;
538                                         }
539                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
540                                         break;
541                                 else
542                                         btmp=btmp->next_bio;
543                                 }
544                         
545                         /* We now have the EVP_MD_CTX, lets do the
546                          * signing. */
547                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
548                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
549                                 {
550                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
551                                 goto err;
552                                 }
553
554                         sk=si->auth_attr;
555
556                         /* If there are attributes, we add the digest
557                          * attribute and only sign the attributes */
558                         if ((sk != NULL) && (sk_num(sk) != 0))
559                                 {
560                                 unsigned char md_data[EVP_MAX_MD_SIZE];
561                                 unsigned int md_len;
562                                 ASN1_OCTET_STRING *digest;
563                                 ASN1_UTCTIME *sign_time;
564                                 EVP_MD *md_tmp;
565
566                                 /* Add signing time */
567                                 sign_time=X509_gmtime_adj(NULL,0);
568                                 PKCS7_add_signed_attribute(si,
569                                         NID_pkcs9_signingTime,
570                                         V_ASN1_UTCTIME,(char *)sign_time);
571
572                                 /* Add digest */
573                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
574                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
575                                 digest=ASN1_OCTET_STRING_new();
576                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
577                                 PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
578                                         V_ASN1_OCTET_STRING,(char *)digest);
579
580                                 /* Now sign the mess */
581                                 EVP_SignInit(&ctx_tmp,md_tmp);
582                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
583                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
584                                 pp=(unsigned char *)Malloc(x);
585                                 p=pp;
586                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
587                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
588                                 EVP_SignUpdate(&ctx_tmp,pp,x);
589                                 Free(pp);
590                                 pp=NULL;
591                                 }
592
593                         if (si->pkey->type == EVP_PKEY_DSA)
594                                 ctx_tmp.digest=EVP_dss1();
595
596                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
597                                 (unsigned int *)&buf->length,si->pkey))
598                                 {
599                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
600                                 goto err;
601                                 }
602                         if (!ASN1_STRING_set(si->enc_digest,
603                                 (unsigned char *)buf->data,buf->length))
604                                 {
605                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
606                                 goto err;
607                                 }
608                         }
609                 }
610
611         if (p7->detached)
612                 ASN1_OCTET_STRING_set(os,(unsigned char *)"",0);
613         else
614                 {
615                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
616                 if (btmp == NULL)
617                         {
618                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
619                         goto err;
620                         }
621                 BIO_get_mem_ptr(btmp,&buf_mem);
622                 ASN1_OCTET_STRING_set(os,
623                         (unsigned char *)buf_mem->data,buf_mem->length);
624                 }
625         if (pp != NULL) Free(pp);
626         pp=NULL;
627
628         ret=1;
629 err:
630         if (buf != NULL) BUF_MEM_free(buf);
631         return(ret);
632         }
633
634 int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
635 X509_STORE *cert_store;
636 X509_STORE_CTX *ctx;
637 BIO *bio;
638 PKCS7 *p7;
639 PKCS7_SIGNER_INFO *si;
640         {
641 /*      PKCS7_SIGNED *s; */
642         ASN1_OCTET_STRING *os;
643         EVP_MD_CTX mdc_tmp,*mdc;
644         unsigned char *pp,*p;
645         PKCS7_ISSUER_AND_SERIAL *ias;
646         int ret=0,i;
647         int md_type;
648         STACK *sk,*cert;
649         BIO *btmp;
650         X509 *x509;
651
652         if (PKCS7_type_is_signed(p7))
653                 {
654                 cert=p7->d.sign->cert;
655                 }
656         else if (PKCS7_type_is_signedAndEnveloped(p7))
657                 {
658                 cert=p7->d.signed_and_enveloped->cert;
659                 }
660         else
661                 {
662                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
663                 goto err;
664                 }
665         /* XXXXXXXXXXXXXXXXXXXXXXX */
666         ias=si->issuer_and_serial;
667
668         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
669
670         /* were we able to find the cert in passed to us */
671         if (x509 == NULL)
672                 {
673                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
674                 goto err;
675                 }
676
677         /* Lets verify */
678         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
679         i=X509_verify_cert(ctx);
680         if (i <= 0) 
681                 {
682                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
683                 goto err;
684                 }
685         X509_STORE_CTX_cleanup(ctx);
686
687         /* So we like 'x509', lets check the signature. */
688         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
689
690         btmp=bio;
691         for (;;)
692                 {
693                 if ((btmp == NULL) ||
694                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
695                         {
696                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
697                         goto err;
698                         }
699                 BIO_get_md_ctx(btmp,&mdc);
700                 if (mdc == NULL)
701                         {
702                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
703                         goto err;
704                         }
705                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
706                         break;
707                 btmp=btmp->next_bio;    
708                 }
709
710         /* mdc is the digest ctx that we want, unless there are attributes,
711          * in which case the digest is the signed attributes */
712         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
713
714         sk=si->auth_attr;
715         if ((sk != NULL) && (sk_num(sk) != 0))
716                 {
717                 unsigned char md_dat[EVP_MAX_MD_SIZE];
718                 int md_len;
719                 ASN1_OCTET_STRING *message_digest;
720
721                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
722                 message_digest=PKCS7_digest_from_attributes(sk);
723                 if (!message_digest)
724                         {
725                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
726                         goto err;
727                         }
728                 if ((message_digest->length != md_len) ||
729                         (memcmp(message_digest->data,md_dat,md_len)))
730                         {
731 #if 0
732 {
733 int ii;
734 for (ii=0; ii<message_digest->length; ii++)
735         printf("%02X",message_digest->data[ii]); printf(" sent\n");
736 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
737 }
738 #endif
739                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
740                         ret= -1;
741                         goto err;
742                         }
743
744                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
745                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
746                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
747                 pp=(unsigned char *)Malloc(i);
748                 p=pp;
749                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
750                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
751                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
752                 Free(pp);
753                 }
754
755         os=si->enc_digest;
756         if (X509_get_pubkey(x509)->type == EVP_PKEY_DSA)
757                 mdc_tmp.digest=EVP_dss1();
758
759         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
760                 X509_get_pubkey(x509));
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(p7,idx)
774 PKCS7 *p7;
775 int idx;
776         {
777         STACK *rsk;
778         PKCS7_RECIP_INFO *ri;
779         int i;
780
781         i=OBJ_obj2nid(p7->type);
782         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
783         rsk=p7->d.signed_and_enveloped->recipientinfo;
784         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
785         if (sk_num(rsk) <= idx) return(NULL);
786         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
787         return(ri->issuer_and_serial);
788         }
789
790 ASN1_TYPE *PKCS7_get_signed_attribute(si,nid)
791 PKCS7_SIGNER_INFO *si;
792 int nid;
793         {
794         return(get_attribute(si->auth_attr,nid));
795         }
796
797 ASN1_TYPE *PKCS7_get_attribute(si,nid)
798 PKCS7_SIGNER_INFO *si;
799 int nid;
800         {
801         return(get_attribute(si->unauth_attr,nid));
802         }
803
804 static ASN1_TYPE *get_attribute(sk,nid)
805 STACK *sk;
806 int nid;
807         {
808         int i;
809         X509_ATTRIBUTE *xa;
810         ASN1_OBJECT *o;
811
812         o=OBJ_nid2obj(nid);
813         if (o == NULL) return(NULL);
814         for (i=0; i<sk_num(sk); i++)
815                 {
816                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
817                 if (OBJ_cmp(xa->object,o) == 0)
818                         {
819                         if (xa->set && sk_num(xa->value.set))
820                                 return((ASN1_TYPE *)sk_value(xa->value.set,0));
821                         else
822                                 return(NULL);
823                         }
824                 }
825         return(NULL);
826         }
827
828 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(sk)
829 STACK *sk;
830         {
831         X509_ATTRIBUTE *attr;
832         ASN1_TYPE *astype;
833         int i;
834         if (!sk || !sk_num(sk)) return NULL;
835         /* Search the attributes for a digest */
836         for (i = 0; i < sk_num(sk); i++)
837                 {
838                 attr = (X509_ATTRIBUTE *) sk_value(sk, i);
839                 if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
840                         {
841                         if (!attr->set) return NULL;
842                         if (!attr->value.set ||
843                                  !sk_num (attr->value.set) ) return NULL;
844                         astype = (ASN1_TYPE *) sk_value(attr->value.set, 0);
845                         return astype->value.octet_string;
846                         }
847                 }
848         return NULL;
849         }
850
851 int PKCS7_set_signed_attributes(p7si,sk)
852 PKCS7_SIGNER_INFO *p7si;
853 STACK *sk;
854         {
855         int i;
856
857         if (p7si->auth_attr != NULL)
858                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
859         p7si->auth_attr=sk_dup(sk);
860         for (i=0; i<sk_num(sk); i++)
861                 {
862                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
863                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
864                         return(0);
865                 }
866         return(1);
867         }
868
869 int PKCS7_set_attributes(p7si,sk)
870 PKCS7_SIGNER_INFO *p7si;
871 STACK *sk;
872         {
873         int i;
874
875         if (p7si->unauth_attr != NULL)
876                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
877         p7si->unauth_attr=sk_dup(sk);
878         for (i=0; i<sk_num(sk); i++)
879                 {
880                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
881                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
882                         return(0);
883                 }
884         return(1);
885         }
886
887 int PKCS7_add_signed_attribute(p7si,nid,atrtype,value)
888 PKCS7_SIGNER_INFO *p7si;
889 int nid;
890 int atrtype;
891 char *value;
892         {
893         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
894         }
895
896 int PKCS7_add_attribute(p7si,nid,atrtype,value)
897 PKCS7_SIGNER_INFO *p7si;
898 int nid;
899 int atrtype;
900 char *value;
901         {
902         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
903         }
904
905 static int add_attribute(sk, nid, atrtype, value)
906 STACK **sk;
907 int nid;
908 int atrtype;
909 char *value;
910         {
911         X509_ATTRIBUTE *attr=NULL;
912
913         if (*sk == NULL)
914                 {
915                 *sk = sk_new(NULL);
916 new_attrib:
917                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
918                 sk_push(*sk,(char *)attr);
919                 }
920         else
921                 {
922                 int i;
923
924                 for (i=0; i<sk_num(*sk); i++)
925                         {
926                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
927                         if (OBJ_obj2nid(attr->object) == nid)
928                                 {
929                                 X509_ATTRIBUTE_free(attr);
930                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
931                                 sk_value(*sk,i)=(char *)attr;
932                                 goto end;
933                                 }
934                         }
935                 goto new_attrib;
936                 }
937 end:
938         return(1);
939         }
940