16c1556b2cddb158b7c47d07329357488559e3e0
[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 *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_num(rsk); i++)
178                         {
179                         ri=(PKCS7_RECIP_INFO *)sk_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_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                         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                         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                 {
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(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
259         {
260         int i,j;
261         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
262         char *tmp=NULL;
263         X509_ALGOR *xa;
264         ASN1_OCTET_STRING *data_body=NULL;
265         const EVP_MD *evp_md;
266         const EVP_CIPHER *evp_cipher=NULL;
267         EVP_CIPHER_CTX *evp_ctx=NULL;
268         X509_ALGOR *enc_alg=NULL;
269         STACK_OF(X509_ALGOR) *md_sk=NULL;
270         STACK *rsk=NULL;
271         X509_ALGOR *xalg=NULL;
272         PKCS7_RECIP_INFO *ri=NULL;
273 /*      EVP_PKEY *pkey; */
274 #if 0
275         X509_STORE_CTX s_ctx;
276 #endif
277
278         i=OBJ_obj2nid(p7->type);
279         p7->state=PKCS7_S_HEADER;
280
281         switch (i)
282                 {
283         case NID_pkcs7_signed:
284                 data_body=p7->d.sign->contents->d.data;
285                 md_sk=p7->d.sign->md_algs;
286                 break;
287         case NID_pkcs7_signedAndEnveloped:
288                 rsk=p7->d.signed_and_enveloped->recipientinfo;
289                 md_sk=p7->d.signed_and_enveloped->md_algs;
290                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
291                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
292                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
293                 if (evp_cipher == NULL)
294                         {
295                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
296                         goto err;
297                         }
298                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
299                 break;
300         case NID_pkcs7_enveloped:
301                 rsk=p7->d.enveloped->recipientinfo;
302                 enc_alg=p7->d.enveloped->enc_data->algorithm;
303                 data_body=p7->d.enveloped->enc_data->enc_data;
304                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
305                 if (evp_cipher == NULL)
306                         {
307                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
308                         goto err;
309                         }
310                 xalg=p7->d.enveloped->enc_data->algorithm;
311                 break;
312         default:
313                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
314                 goto err;
315                 }
316
317         /* We will be checking the signature */
318         if (md_sk != NULL)
319                 {
320                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
321                         {
322                         xa=sk_X509_ALGOR_value(md_sk,i);
323                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
324                                 {
325                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
326                                 goto err;
327                                 }
328
329                         j=OBJ_obj2nid(xa->algorithm);
330                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
331                         if (evp_md == NULL)
332                                 {
333                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
334                                 goto err;
335                                 }
336
337                         BIO_set_md(btmp,evp_md);
338                         if (out == NULL)
339                                 out=btmp;
340                         else
341                                 BIO_push(out,btmp);
342                         btmp=NULL;
343                         }
344                 }
345
346         if (evp_cipher != NULL)
347                 {
348 #if 0
349                 unsigned char key[EVP_MAX_KEY_LENGTH];
350                 unsigned char iv[EVP_MAX_IV_LENGTH];
351                 unsigned char *p;
352                 int keylen,ivlen;
353                 int max;
354                 X509_OBJECT ret;
355 #endif
356                 int jj;
357
358                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
359                         {
360                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
361                         goto err;
362                         }
363
364                 /* It was encrypted, we need to decrypt the secret key
365                  * with the private key */
366
367                 /* Find the recipientInfo which matches the passed certificate
368                  * (if any)
369                  */
370
371                 for (i=0; i<sk_num(rsk); i++) {
372                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
373                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
374                                         pcert->cert_info->issuer) &&
375                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
376                                         ri->issuer_and_serial->serial)) break;
377                         ri=NULL;
378                 }
379                 if (ri == NULL) {
380                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
381                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
382                         return(NULL);
383                 }
384
385                 jj=EVP_PKEY_size(pkey);
386                 tmp=Malloc(jj+10);
387                 if (tmp == NULL)
388                         {
389                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
390                         goto err;
391                         }
392
393                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
394                         ASN1_STRING_data(ri->enc_key),
395                         ASN1_STRING_length(ri->enc_key),
396                         pkey);
397                 if (jj <= 0)
398                         {
399                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
400                         goto err;
401                         }
402
403                 evp_ctx=NULL;
404                 BIO_get_cipher_ctx(etmp,&evp_ctx);
405                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
406                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
407                         return(NULL);
408
409                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
410                         {
411                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
412                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
413                         goto err;
414                         }
415                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
416
417                 memset(tmp,0,jj);
418
419                 if (out == NULL)
420                         out=etmp;
421                 else
422                         BIO_push(out,etmp);
423                 etmp=NULL;
424                 }
425
426 #if 1
427         if (p7->detached || (in_bio != NULL))
428                 {
429                 bio=in_bio;
430                 }
431         else 
432                 {
433                 bio=BIO_new(BIO_s_mem());
434                 /* We need to set this so that when we have read all
435                  * the data, the encrypt BIO, if present, will read
436                  * EOF and encode the last few bytes */
437                 BIO_set_mem_eof_return(bio,0);
438
439                 if (data_body->length > 0)
440                         BIO_write(bio,(char *)data_body->data,data_body->length);
441                 }
442         BIO_push(out,bio);
443         bio=NULL;
444 #endif
445         if (0)
446                 {
447 err:
448                 if (out != NULL) BIO_free_all(out);
449                 if (btmp != NULL) BIO_free_all(btmp);
450                 if (etmp != NULL) BIO_free_all(etmp);
451                 if (bio != NULL) BIO_free_all(bio);
452                 out=NULL;
453                 }
454         if (tmp != NULL)
455                 Free(tmp);
456         return(out);
457         }
458
459 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
460         {
461         int ret=0;
462         int i,j;
463         BIO *btmp;
464         BUF_MEM *buf_mem=NULL;
465         BUF_MEM *buf=NULL;
466         PKCS7_SIGNER_INFO *si;
467         EVP_MD_CTX *mdc,ctx_tmp;
468         STACK_OF(X509_ATTRIBUTE) *sk;
469         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
470         unsigned char *p,*pp=NULL;
471         int x;
472         ASN1_OCTET_STRING *os=NULL;
473
474         i=OBJ_obj2nid(p7->type);
475         p7->state=PKCS7_S_HEADER;
476
477         switch (i)
478                 {
479         case NID_pkcs7_signedAndEnveloped:
480                 /* XXXXXXXXXXXXXXXX */
481                 si_sk=p7->d.signed_and_enveloped->signer_info;
482                 os=ASN1_OCTET_STRING_new();
483                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
484                 break;
485         case NID_pkcs7_enveloped:
486                 /* XXXXXXXXXXXXXXXX */
487                 os=ASN1_OCTET_STRING_new();
488                 p7->d.enveloped->enc_data->enc_data=os;
489                 break;
490         case NID_pkcs7_signed:
491                 si_sk=p7->d.sign->signer_info;
492                 os=p7->d.sign->contents->d.data;
493                 /* If detached data then the content is excluded */
494                 if(p7->detached) {
495                         ASN1_OCTET_STRING_free(os);
496                         p7->d.sign->contents->d.data = NULL;
497                 }
498                 break;
499                 }
500
501         if (si_sk != NULL)
502                 {
503                 if ((buf=BUF_MEM_new()) == NULL)
504                         {
505                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
506                         goto err;
507                         }
508                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
509                         {
510                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
511                         if (si->pkey == NULL) continue;
512
513                         j=OBJ_obj2nid(si->digest_alg->algorithm);
514
515                         btmp=bio;
516                         for (;;)
517                                 {
518                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
519                                         == NULL)
520                                         {
521                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
522                                         goto err;
523                                         }
524                                 BIO_get_md_ctx(btmp,&mdc);
525                                 if (mdc == NULL)
526                                         {
527                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
528                                         goto err;
529                                         }
530                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
531                                         break;
532                                 else
533                                         btmp=btmp->next_bio;
534                                 }
535                         
536                         /* We now have the EVP_MD_CTX, lets do the
537                          * signing. */
538                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
539                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
540                                 {
541                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
542                                 goto err;
543                                 }
544
545                         sk=si->auth_attr;
546
547                         /* If there are attributes, we add the digest
548                          * attribute and only sign the attributes */
549                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
550                                 {
551                                 unsigned char md_data[EVP_MAX_MD_SIZE];
552                                 unsigned int md_len;
553                                 ASN1_OCTET_STRING *digest;
554                                 ASN1_UTCTIME *sign_time;
555                                 const EVP_MD *md_tmp;
556
557                                 /* Add signing time */
558                                 sign_time=X509_gmtime_adj(NULL,0);
559                                 PKCS7_add_signed_attribute(si,
560                                         NID_pkcs9_signingTime,
561                                         V_ASN1_UTCTIME,sign_time);
562
563                                 /* Add digest */
564                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
565                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
566                                 digest=ASN1_OCTET_STRING_new();
567                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
568                                 PKCS7_add_signed_attribute(si,
569                                         NID_pkcs9_messageDigest,
570                                         V_ASN1_OCTET_STRING,digest);
571
572                                 /* Now sign the mess */
573                                 EVP_SignInit(&ctx_tmp,md_tmp);
574                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
575                                            i2d_X509_ATTRIBUTE,
576                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
577                                 pp=(unsigned char *)Malloc(x);
578                                 p=pp;
579                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
580                                            i2d_X509_ATTRIBUTE,
581                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
582                                 EVP_SignUpdate(&ctx_tmp,pp,x);
583                                 Free(pp);
584                                 pp=NULL;
585                                 }
586
587                         if (si->pkey->type == EVP_PKEY_DSA)
588                                 ctx_tmp.digest=EVP_dss1();
589
590                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
591                                 (unsigned int *)&buf->length,si->pkey))
592                                 {
593                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
594                                 goto err;
595                                 }
596                         if (!ASN1_STRING_set(si->enc_digest,
597                                 (unsigned char *)buf->data,buf->length))
598                                 {
599                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
600                                 goto err;
601                                 }
602                         }
603                 }
604
605         if (!p7->detached)
606                 {
607                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
608                 if (btmp == NULL)
609                         {
610                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
611                         goto err;
612                         }
613                 BIO_get_mem_ptr(btmp,&buf_mem);
614                 ASN1_OCTET_STRING_set(os,
615                         (unsigned char *)buf_mem->data,buf_mem->length);
616                 }
617         if (pp != NULL) Free(pp);
618         pp=NULL;
619
620         ret=1;
621 err:
622         if (buf != NULL) BUF_MEM_free(buf);
623         return(ret);
624         }
625
626 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
627              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
628         {
629 /*      PKCS7_SIGNED *s; */
630         ASN1_OCTET_STRING *os;
631         EVP_MD_CTX mdc_tmp,*mdc;
632         unsigned char *pp,*p;
633         PKCS7_ISSUER_AND_SERIAL *ias;
634         int ret=0,i;
635         int md_type;
636         STACK_OF(X509_ATTRIBUTE) *sk;
637         STACK_OF(X509) *cert;
638         BIO *btmp;
639         X509 *x509;
640         EVP_PKEY *pkey;
641
642         if (PKCS7_type_is_signed(p7))
643                 {
644                 cert=p7->d.sign->cert;
645                 }
646         else if (PKCS7_type_is_signedAndEnveloped(p7))
647                 {
648                 cert=p7->d.signed_and_enveloped->cert;
649                 }
650         else
651                 {
652                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
653                 goto err;
654                 }
655         /* XXXXXXXXXXXXXXXXXXXXXXX */
656         ias=si->issuer_and_serial;
657
658         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
659
660         /* were we able to find the cert in passed to us */
661         if (x509 == NULL)
662                 {
663                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
664                 goto err;
665                 }
666
667         /* Lets verify */
668         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
669         i=X509_verify_cert(ctx);
670         if (i <= 0) 
671                 {
672                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
673                 goto err;
674                 }
675         X509_STORE_CTX_cleanup(ctx);
676
677         /* So we like 'x509', lets check the signature. */
678         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
679
680         btmp=bio;
681         for (;;)
682                 {
683                 if ((btmp == NULL) ||
684                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
685                         {
686                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
687                         goto err;
688                         }
689                 BIO_get_md_ctx(btmp,&mdc);
690                 if (mdc == NULL)
691                         {
692                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
693                         goto err;
694                         }
695                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
696                         break;
697                 btmp=btmp->next_bio;    
698                 }
699
700         /* mdc is the digest ctx that we want, unless there are attributes,
701          * in which case the digest is the signed attributes */
702         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
703
704         sk=si->auth_attr;
705         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
706                 {
707                 unsigned char md_dat[EVP_MAX_MD_SIZE];
708                 unsigned int md_len;
709                 ASN1_OCTET_STRING *message_digest;
710
711                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
712                 message_digest=PKCS7_digest_from_attributes(sk);
713                 if (!message_digest)
714                         {
715                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
716                         goto err;
717                         }
718                 if ((message_digest->length != (int)md_len) ||
719                         (memcmp(message_digest->data,md_dat,md_len)))
720                         {
721 #if 0
722 {
723 int ii;
724 for (ii=0; ii<message_digest->length; ii++)
725         printf("%02X",message_digest->data[ii]); printf(" sent\n");
726 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
727 }
728 #endif
729                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
730                         ret= -1;
731                         goto err;
732                         }
733
734                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
735                 /* Note: when forming the encoding of the attributes we
736                  * shouldn't reorder them or this will break the signature.
737                  * This is done by using the IS_SEQUENCE flag.
738                  */
739                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
740                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
741                 pp=Malloc(i);
742                 p=pp;
743                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
744                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
745                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
746
747                 Free(pp);
748                 }
749
750         os=si->enc_digest;
751         pkey = X509_get_pubkey(x509);
752         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
753
754         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
755         EVP_PKEY_free(pkey);
756         if (i <= 0)
757                 {
758                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
759                 ret= -1;
760                 goto err;
761                 }
762         else
763                 ret=1;
764 err:
765         return(ret);
766         }
767
768 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
769         {
770         STACK *rsk;
771         PKCS7_RECIP_INFO *ri;
772         int i;
773
774         i=OBJ_obj2nid(p7->type);
775         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
776         rsk=p7->d.signed_and_enveloped->recipientinfo;
777         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
778         if (sk_num(rsk) <= idx) return(NULL);
779         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
780         return(ri->issuer_and_serial);
781         }
782
783 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
784         {
785         return(get_attribute(si->auth_attr,nid));
786         }
787
788 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
789         {
790         return(get_attribute(si->unauth_attr,nid));
791         }
792
793 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
794         {
795         int i;
796         X509_ATTRIBUTE *xa;
797         ASN1_OBJECT *o;
798
799         o=OBJ_nid2obj(nid);
800         if (!o || !sk) return(NULL);
801         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
802                 {
803                 xa=sk_X509_ATTRIBUTE_value(sk,i);
804                 if (OBJ_cmp(xa->object,o) == 0)
805                         {
806                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
807                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
808                         else
809                                 return(NULL);
810                         }
811                 }
812         return(NULL);
813         }
814
815 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
816 {
817         ASN1_TYPE *astype;
818         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
819         return astype->value.octet_string;
820 }
821
822 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
823                                 STACK_OF(X509_ATTRIBUTE) *sk)
824         {
825         int i;
826
827         if (p7si->auth_attr != NULL)
828                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
829         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
830         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
831                 {
832                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
833                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
834                     == NULL)
835                         return(0);
836                 }
837         return(1);
838         }
839
840 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
841         {
842         int i;
843
844         if (p7si->unauth_attr != NULL)
845                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
846                                            X509_ATTRIBUTE_free);
847         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
848         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
849                 {
850                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
851                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
852                     == NULL)
853                         return(0);
854                 }
855         return(1);
856         }
857
858 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
859              void *value)
860         {
861         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
862         }
863
864 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
865              void *value)
866         {
867         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
868         }
869
870 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
871                          void *value)
872         {
873         X509_ATTRIBUTE *attr=NULL;
874
875         if (*sk == NULL)
876                 {
877                 *sk = sk_X509_ATTRIBUTE_new(NULL);
878 new_attrib:
879                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
880                 sk_X509_ATTRIBUTE_push(*sk,attr);
881                 }
882         else
883                 {
884                 int i;
885
886                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
887                         {
888                         attr=sk_X509_ATTRIBUTE_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_X509_ATTRIBUTE_set(*sk,i,attr);
894                                 goto end;
895                                 }
896                         }
897                 goto new_attrib;
898                 }
899 end:
900         return(1);
901         }
902