47855bdb68cf3713ea0e8f120056047960db33f3
[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                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
92                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
93                 if (evp_cipher == NULL)
94                         {
95                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
96                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
97                         goto err;
98                         }
99                 break;
100         case NID_pkcs7_enveloped:
101                 rsk=p7->d.enveloped->recipientinfo;
102                 xalg=p7->d.enveloped->enc_data->algorithm;
103                 evp_cipher=p7->d.enveloped->enc_data->cipher;
104                 if (evp_cipher == NULL)
105                         {
106                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
107                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
108                         goto err;
109                         }
110                 break;
111         default:
112                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
113                 goto err;
114                 }
115
116         if (md_sk != NULL)
117                 {
118                 for (i=0; i<sk_num(md_sk); i++)
119                         {
120                         xa=(X509_ALGOR *)sk_value(md_sk,i);
121                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
122                                 {
123                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
124                                 goto err;
125                                 }
126
127                         j=OBJ_obj2nid(xa->algorithm);
128                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
129                         if (evp_md == NULL)
130                                 {
131                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
132                                 goto err;
133                                 }
134
135                         BIO_set_md(btmp,evp_md);
136                         if (out == NULL)
137                                 out=btmp;
138                         else
139                                 BIO_push(out,btmp);
140                         btmp=NULL;
141                         }
142                 }
143
144         if (evp_cipher != NULL)
145                 {
146                 unsigned char key[EVP_MAX_KEY_LENGTH];
147                 unsigned char iv[EVP_MAX_IV_LENGTH];
148                 int keylen,ivlen;
149                 int jj,max;
150                 unsigned char *tmp;
151                 EVP_CIPHER_CTX *ctx;
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                 BIO_get_cipher_ctx(btmp, &ctx);
159                 keylen=EVP_CIPHER_key_length(evp_cipher);
160                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
161                 RAND_bytes(key,keylen);
162                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
163                 if (ivlen > 0) RAND_bytes(iv,ivlen);
164                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
165
166                 if (ivlen > 0) {
167                         if (xalg->parameter == NULL) 
168                                                 xalg->parameter=ASN1_TYPE_new();
169                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
170                                                                        goto err;
171                 }
172
173                 /* Lets do the pub key stuff :-) */
174                 max=0;
175                 for (i=0; i<sk_num(rsk); i++)
176                         {
177                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
178                         if (ri->cert == NULL)
179                                 {
180                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
181                                 goto err;
182                                 }
183                         pkey=X509_get_pubkey(ri->cert);
184                         jj=EVP_PKEY_size(pkey);
185                         EVP_PKEY_free(pkey);
186                         if (max < jj) max=jj;
187                         }
188                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
189                         {
190                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
191                         goto err;
192                         }
193                 for (i=0; i<sk_num(rsk); i++)
194                         {
195                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
196                         pkey=X509_get_pubkey(ri->cert);
197                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
198                         EVP_PKEY_free(pkey);
199                         if (jj <= 0)
200                                 {
201                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
202                                 Free(tmp);
203                                 goto err;
204                                 }
205                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
206                         }
207                 Free(tmp);
208                 memset(key, 0, keylen);
209
210                 if (out == NULL)
211                         out=btmp;
212                 else
213                         BIO_push(out,btmp);
214                 btmp=NULL;
215                 }
216
217         if (bio == NULL) /* ??????????? */
218                 {
219                 if (p7->detached)
220                         bio=BIO_new(BIO_s_null());
221                 else
222                         {
223                         bio=BIO_new(BIO_s_mem());
224                         /* We need to set this so that when we have read all
225                          * the data, the encrypt BIO, if present, will read
226                          * EOF and encode the last few bytes */
227                         BIO_set_mem_eof_return(bio,0);
228
229                         if (PKCS7_type_is_signed(p7) &&
230                                 PKCS7_type_is_data(p7->d.sign->contents))
231                                 {
232                                 ASN1_OCTET_STRING *os;
233
234                                 os=p7->d.sign->contents->d.data;
235                                 if (os->length > 0)
236                                         BIO_write(bio,(char *)os->data,
237                                                 os->length);
238                                 }
239                         }
240                 }
241         BIO_push(out,bio);
242         bio=NULL;
243         if (0)
244                 {
245 err:
246                 if (out != NULL)
247                         BIO_free_all(out);
248                 if (btmp != NULL)
249                         BIO_free_all(btmp);
250                 out=NULL;
251                 }
252         return(out);
253         }
254
255 /* int */
256 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
257         {
258         int i,j;
259         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
260         char *tmp=NULL;
261         X509_ALGOR *xa;
262         ASN1_OCTET_STRING *data_body=NULL;
263         const EVP_MD *evp_md;
264         const EVP_CIPHER *evp_cipher=NULL;
265         EVP_CIPHER_CTX *evp_ctx=NULL;
266         X509_ALGOR *enc_alg=NULL;
267         STACK *md_sk=NULL,*rsk=NULL;
268         X509_ALGOR *xalg=NULL;
269         PKCS7_RECIP_INFO *ri=NULL;
270 /*      EVP_PKEY *pkey; */
271 #if 0
272         X509_STORE_CTX s_ctx;
273 #endif
274
275         i=OBJ_obj2nid(p7->type);
276         p7->state=PKCS7_S_HEADER;
277
278         switch (i)
279                 {
280         case NID_pkcs7_signed:
281                 data_body=p7->d.sign->contents->d.data;
282                 md_sk=p7->d.sign->md_algs;
283                 break;
284         case NID_pkcs7_signedAndEnveloped:
285                 rsk=p7->d.signed_and_enveloped->recipientinfo;
286                 md_sk=p7->d.signed_and_enveloped->md_algs;
287                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
288                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
289                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
290                 if (evp_cipher == NULL)
291                         {
292                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
293                         goto err;
294                         }
295                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
296                 break;
297         case NID_pkcs7_enveloped:
298                 rsk=p7->d.enveloped->recipientinfo;
299                 enc_alg=p7->d.enveloped->enc_data->algorithm;
300                 data_body=p7->d.enveloped->enc_data->enc_data;
301                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
302                 if (evp_cipher == NULL)
303                         {
304                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
305                         goto err;
306                         }
307                 xalg=p7->d.enveloped->enc_data->algorithm;
308                 break;
309         default:
310                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
311                 goto err;
312                 }
313
314         /* We will be checking the signature */
315         if (md_sk != NULL)
316                 {
317                 for (i=0; i<sk_num(md_sk); i++)
318                         {
319                         xa=(X509_ALGOR *)sk_value(md_sk,i);
320                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
321                                 {
322                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
323                                 goto err;
324                                 }
325
326                         j=OBJ_obj2nid(xa->algorithm);
327                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
328                         if (evp_md == NULL)
329                                 {
330                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
331                                 goto err;
332                                 }
333
334                         BIO_set_md(btmp,evp_md);
335                         if (out == NULL)
336                                 out=btmp;
337                         else
338                                 BIO_push(out,btmp);
339                         btmp=NULL;
340                         }
341                 }
342
343         if (evp_cipher != NULL)
344                 {
345 #if 0
346                 unsigned char key[EVP_MAX_KEY_LENGTH];
347                 unsigned char iv[EVP_MAX_IV_LENGTH];
348                 unsigned char *p;
349                 int keylen,ivlen;
350                 int max;
351                 X509_OBJECT ret;
352 #endif
353                 int jj;
354
355                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
356                         {
357                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
358                         goto err;
359                         }
360
361                 /* It was encrypted, we need to decrypt the secret key
362                  * with the private key */
363
364                 /* Find the recipientInfo which matches the passed certificate
365                  * (if any)
366                  */
367
368                 for (i=0; i<sk_num(rsk); i++) {
369                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
370                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
371                                         pcert->cert_info->issuer) &&
372                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
373                                         ri->issuer_and_serial->serial)) break;
374                         ri=NULL;
375                 }
376                 if (ri == NULL) {
377                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
378                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
379                         return(NULL);
380                 }
381
382                 jj=EVP_PKEY_size(pkey);
383                 tmp=Malloc(jj+10);
384                 if (tmp == NULL)
385                         {
386                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
387                         goto err;
388                         }
389
390                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
391                         ASN1_STRING_data(ri->enc_key),
392                         ASN1_STRING_length(ri->enc_key),
393                         pkey);
394                 if (jj <= 0)
395                         {
396                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
397                         goto err;
398                         }
399
400                 evp_ctx=NULL;
401                 BIO_get_cipher_ctx(etmp,&evp_ctx);
402                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
403                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
404                         return(NULL);
405
406                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
407                         {
408                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
409                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
410                         goto err;
411                         }
412                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
413
414                 memset(tmp,0,jj);
415
416                 if (out == NULL)
417                         out=etmp;
418                 else
419                         BIO_push(out,etmp);
420                 etmp=NULL;
421                 }
422
423 #if 1
424         if (p7->detached || (in_bio != NULL))
425                 {
426                 bio=in_bio;
427                 }
428         else 
429                 {
430                 bio=BIO_new(BIO_s_mem());
431                 /* We need to set this so that when we have read all
432                  * the data, the encrypt BIO, if present, will read
433                  * EOF and encode the last few bytes */
434                 BIO_set_mem_eof_return(bio,0);
435
436                 if (data_body->length > 0)
437                         BIO_write(bio,(char *)data_body->data,data_body->length);
438                 }
439         BIO_push(out,bio);
440         bio=NULL;
441 #endif
442         if (0)
443                 {
444 err:
445                 if (out != NULL) BIO_free_all(out);
446                 if (btmp != NULL) BIO_free_all(btmp);
447                 if (etmp != NULL) BIO_free_all(etmp);
448                 if (bio != NULL) BIO_free_all(bio);
449                 out=NULL;
450                 }
451         if (tmp != NULL)
452                 Free(tmp);
453         return(out);
454         }
455
456 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
457         {
458         int ret=0;
459         int i,j;
460         BIO *btmp;
461         BUF_MEM *buf_mem=NULL;
462         BUF_MEM *buf=NULL;
463         PKCS7_SIGNER_INFO *si;
464         EVP_MD_CTX *mdc,ctx_tmp;
465         STACK *sk,*si_sk=NULL;
466         unsigned char *p,*pp=NULL;
467         int x;
468         ASN1_OCTET_STRING *os=NULL;
469
470         i=OBJ_obj2nid(p7->type);
471         p7->state=PKCS7_S_HEADER;
472
473         switch (i)
474                 {
475         case NID_pkcs7_signedAndEnveloped:
476                 /* XXXXXXXXXXXXXXXX */
477                 si_sk=p7->d.signed_and_enveloped->signer_info;
478                 os=ASN1_OCTET_STRING_new();
479                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
480                 break;
481         case NID_pkcs7_enveloped:
482                 /* XXXXXXXXXXXXXXXX */
483                 os=ASN1_OCTET_STRING_new();
484                 p7->d.enveloped->enc_data->enc_data=os;
485                 break;
486         case NID_pkcs7_signed:
487                 si_sk=p7->d.sign->signer_info;
488                 os=p7->d.sign->contents->d.data;
489                 /* If detached data then the content is excluded */
490                 if(p7->detached) {
491                         ASN1_OCTET_STRING_free(os);
492                         p7->d.sign->contents->d.data = NULL;
493                 }
494                 break;
495                 }
496
497         if (si_sk != NULL)
498                 {
499                 if ((buf=BUF_MEM_new()) == NULL)
500                         {
501                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
502                         goto err;
503                         }
504                 for (i=0; i<sk_num(si_sk); i++)
505                         {
506                         si=(PKCS7_SIGNER_INFO *)
507                                 sk_value(si_sk,i);
508                         if (si->pkey == NULL) continue;
509
510                         j=OBJ_obj2nid(si->digest_alg->algorithm);
511
512                         btmp=bio;
513                         for (;;)
514                                 {
515                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
516                                         == NULL)
517                                         {
518                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
519                                         goto err;
520                                         }
521                                 BIO_get_md_ctx(btmp,&mdc);
522                                 if (mdc == NULL)
523                                         {
524                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
525                                         goto err;
526                                         }
527                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
528                                         break;
529                                 else
530                                         btmp=btmp->next_bio;
531                                 }
532                         
533                         /* We now have the EVP_MD_CTX, lets do the
534                          * signing. */
535                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
536                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
537                                 {
538                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
539                                 goto err;
540                                 }
541
542                         sk=si->auth_attr;
543
544                         /* If there are attributes, we add the digest
545                          * attribute and only sign the attributes */
546                         if ((sk != NULL) && (sk_num(sk) != 0))
547                                 {
548                                 unsigned char md_data[EVP_MAX_MD_SIZE];
549                                 unsigned int md_len;
550                                 ASN1_OCTET_STRING *digest;
551                                 ASN1_UTCTIME *sign_time;
552                                 const EVP_MD *md_tmp;
553
554                                 /* Add signing time */
555                                 sign_time=X509_gmtime_adj(NULL,0);
556                                 PKCS7_add_signed_attribute(si,
557                                         NID_pkcs9_signingTime,
558                                         V_ASN1_UTCTIME,sign_time);
559
560                                 /* Add digest */
561                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
562                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
563                                 digest=ASN1_OCTET_STRING_new();
564                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
565                                 PKCS7_add_signed_attribute(si,
566                                         NID_pkcs9_messageDigest,
567                                         V_ASN1_OCTET_STRING,digest);
568
569                                 /* Now sign the mess */
570                                 EVP_SignInit(&ctx_tmp,md_tmp);
571                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
572                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
573                                 pp=(unsigned char *)Malloc(x);
574                                 p=pp;
575                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
576                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
577                                 EVP_SignUpdate(&ctx_tmp,pp,x);
578                                 Free(pp);
579                                 pp=NULL;
580                                 }
581
582                         if (si->pkey->type == EVP_PKEY_DSA)
583                                 ctx_tmp.digest=EVP_dss1();
584
585                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
586                                 (unsigned int *)&buf->length,si->pkey))
587                                 {
588                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
589                                 goto err;
590                                 }
591                         if (!ASN1_STRING_set(si->enc_digest,
592                                 (unsigned char *)buf->data,buf->length))
593                                 {
594                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
595                                 goto err;
596                                 }
597                         }
598                 }
599
600         if (!p7->detached)
601                 {
602                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
603                 if (btmp == NULL)
604                         {
605                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
606                         goto err;
607                         }
608                 BIO_get_mem_ptr(btmp,&buf_mem);
609                 ASN1_OCTET_STRING_set(os,
610                         (unsigned char *)buf_mem->data,buf_mem->length);
611                 }
612         if (pp != NULL) Free(pp);
613         pp=NULL;
614
615         ret=1;
616 err:
617         if (buf != NULL) BUF_MEM_free(buf);
618         return(ret);
619         }
620
621 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
622              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
623         {
624 /*      PKCS7_SIGNED *s; */
625         ASN1_OCTET_STRING *os;
626         EVP_MD_CTX mdc_tmp,*mdc;
627         unsigned char *pp,*p;
628         PKCS7_ISSUER_AND_SERIAL *ias;
629         int ret=0,i;
630         int md_type;
631         STACK *sk;
632         STACK_OF(X509) *cert;
633         BIO *btmp;
634         X509 *x509;
635         EVP_PKEY *pkey;
636
637         if (PKCS7_type_is_signed(p7))
638                 {
639                 cert=p7->d.sign->cert;
640                 }
641         else if (PKCS7_type_is_signedAndEnveloped(p7))
642                 {
643                 cert=p7->d.signed_and_enveloped->cert;
644                 }
645         else
646                 {
647                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
648                 goto err;
649                 }
650         /* XXXXXXXXXXXXXXXXXXXXXXX */
651         ias=si->issuer_and_serial;
652
653         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
654
655         /* were we able to find the cert in passed to us */
656         if (x509 == NULL)
657                 {
658                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
659                 goto err;
660                 }
661
662         /* Lets verify */
663         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
664         i=X509_verify_cert(ctx);
665         if (i <= 0) 
666                 {
667                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
668                 goto err;
669                 }
670         X509_STORE_CTX_cleanup(ctx);
671
672         /* So we like 'x509', lets check the signature. */
673         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
674
675         btmp=bio;
676         for (;;)
677                 {
678                 if ((btmp == NULL) ||
679                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
680                         {
681                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
682                         goto err;
683                         }
684                 BIO_get_md_ctx(btmp,&mdc);
685                 if (mdc == NULL)
686                         {
687                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
688                         goto err;
689                         }
690                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
691                         break;
692                 btmp=btmp->next_bio;    
693                 }
694
695         /* mdc is the digest ctx that we want, unless there are attributes,
696          * in which case the digest is the signed attributes */
697         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
698
699         sk=si->auth_attr;
700         if ((sk != NULL) && (sk_num(sk) != 0))
701                 {
702                 unsigned char md_dat[EVP_MAX_MD_SIZE];
703                 unsigned int md_len;
704                 ASN1_OCTET_STRING *message_digest;
705
706                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
707                 message_digest=PKCS7_digest_from_attributes(sk);
708                 if (!message_digest)
709                         {
710                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
711                         goto err;
712                         }
713                 if ((message_digest->length != (int)md_len) ||
714                         (memcmp(message_digest->data,md_dat,md_len)))
715                         {
716 #if 0
717 {
718 int ii;
719 for (ii=0; ii<message_digest->length; ii++)
720         printf("%02X",message_digest->data[ii]); printf(" sent\n");
721 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
722 }
723 #endif
724                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
725                         ret= -1;
726                         goto err;
727                         }
728
729                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
730                 /* Note: when forming the encoding of the attributes we
731                  * shouldn't reorder them or this will break the signature.
732                  * This is done by using the IS_SEQUENCE flag.
733                  */
734                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
735                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
736                 pp=(unsigned char *)Malloc(i);
737                 p=pp;
738                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
739                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
740                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
741
742                 Free(pp);
743                 }
744
745         os=si->enc_digest;
746         pkey = X509_get_pubkey(x509);
747         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
748
749         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
750         EVP_PKEY_free(pkey);
751         if (i <= 0)
752                 {
753                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
754                 ret= -1;
755                 goto err;
756                 }
757         else
758                 ret=1;
759 err:
760         return(ret);
761         }
762
763 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
764         {
765         STACK *rsk;
766         PKCS7_RECIP_INFO *ri;
767         int i;
768
769         i=OBJ_obj2nid(p7->type);
770         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
771         rsk=p7->d.signed_and_enveloped->recipientinfo;
772         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
773         if (sk_num(rsk) <= idx) return(NULL);
774         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
775         return(ri->issuer_and_serial);
776         }
777
778 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
779         {
780         return(get_attribute(si->auth_attr,nid));
781         }
782
783 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
784         {
785         return(get_attribute(si->unauth_attr,nid));
786         }
787
788 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
789         {
790         int i;
791         X509_ATTRIBUTE *xa;
792         ASN1_OBJECT *o;
793
794         o=OBJ_nid2obj(nid);
795         if (!o || !sk) return(NULL);
796         for (i=0; i<sk_num(sk); i++)
797                 {
798                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
799                 if (OBJ_cmp(xa->object,o) == 0)
800                         {
801                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
802                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
803                         else
804                                 return(NULL);
805                         }
806                 }
807         return(NULL);
808         }
809
810 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
811 {
812         ASN1_TYPE *astype;
813         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
814         return astype->value.octet_string;
815 }
816
817 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
818         {
819         int i;
820
821         if (p7si->auth_attr != NULL)
822                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
823         p7si->auth_attr=sk_dup(sk);
824         for (i=0; i<sk_num(sk); i++)
825                 {
826                 if ((sk_set(p7si->auth_attr,i,(char *)X509_ATTRIBUTE_dup(
827                         (X509_ATTRIBUTE *)sk_value(sk,i)))) == NULL)
828                         return(0);
829                 }
830         return(1);
831         }
832
833 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
834         {
835         int i;
836
837         if (p7si->unauth_attr != NULL)
838                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
839         p7si->unauth_attr=sk_dup(sk);
840         for (i=0; i<sk_num(sk); i++)
841                 {
842                 if ((sk_set(p7si->unauth_attr,i,(char *)X509_ATTRIBUTE_dup(
843                         (X509_ATTRIBUTE *)sk_value(sk,i)))) == NULL)
844                         return(0);
845                 }
846         return(1);
847         }
848
849 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
850              void *value)
851         {
852         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
853         }
854
855 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
856              void *value)
857         {
858         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
859         }
860
861 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
862         {
863         X509_ATTRIBUTE *attr=NULL;
864
865         if (*sk == NULL)
866                 {
867                 *sk = sk_new(NULL);
868 new_attrib:
869                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
870                 sk_push(*sk,(char *)attr);
871                 }
872         else
873                 {
874                 int i;
875
876                 for (i=0; i<sk_num(*sk); i++)
877                         {
878                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
879                         if (OBJ_obj2nid(attr->object) == nid)
880                                 {
881                                 X509_ATTRIBUTE_free(attr);
882                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
883                                 sk_set(*sk,i,(char *)attr);
884                                 goto end;
885                                 }
886                         }
887                 goto new_attrib;
888                 }
889 end:
890         return(1);
891         }
892