4222173e36b9360bbc4092c4c55896faad60b963
[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 *md_sk=NULL,*rsk=NULL;
77         X509_ALGOR *xalg=NULL;
78         PKCS7_RECIP_INFO *ri=NULL;
79         EVP_PKEY *pkey;
80
81         i=OBJ_obj2nid(p7->type);
82         p7->state=PKCS7_S_HEADER;
83
84         switch (i)
85                 {
86         case NID_pkcs7_signed:
87                 md_sk=p7->d.sign->md_algs;
88                 break;
89         case NID_pkcs7_signedAndEnveloped:
90                 rsk=p7->d.signed_and_enveloped->recipientinfo;
91                 md_sk=p7->d.signed_and_enveloped->md_algs;
92                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
93                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
94                 if (evp_cipher == NULL)
95                         {
96                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
97                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
98                         goto err;
99                         }
100                 break;
101         case NID_pkcs7_enveloped:
102                 rsk=p7->d.enveloped->recipientinfo;
103                 xalg=p7->d.enveloped->enc_data->algorithm;
104                 evp_cipher=p7->d.enveloped->enc_data->cipher;
105                 if (evp_cipher == NULL)
106                         {
107                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
108                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
109                         goto err;
110                         }
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                 EVP_CIPHER_CTX *ctx;
153
154                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
155                         {
156                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
157                         goto err;
158                         }
159                 BIO_get_cipher_ctx(btmp, &ctx);
160                 keylen=EVP_CIPHER_key_length(evp_cipher);
161                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
162                 RAND_bytes(key,keylen);
163                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
164                 if (ivlen > 0) RAND_bytes(iv,ivlen);
165                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
166
167                 if (ivlen > 0) {
168                         if (xalg->parameter == NULL) 
169                                                 xalg->parameter=ASN1_TYPE_new();
170                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
171                                                                        goto err;
172                 }
173
174                 /* Lets do the pub key stuff :-) */
175                 max=0;
176                 for (i=0; i<sk_num(rsk); i++)
177                         {
178                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
179                         if (ri->cert == NULL)
180                                 {
181                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
182                                 goto err;
183                                 }
184                         pkey=X509_get_pubkey(ri->cert);
185                         jj=EVP_PKEY_size(pkey);
186                         EVP_PKEY_free(pkey);
187                         if (max < jj) max=jj;
188                         }
189                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
190                         {
191                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
192                         goto err;
193                         }
194                 for (i=0; i<sk_num(rsk); i++)
195                         {
196                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
197                         pkey=X509_get_pubkey(ri->cert);
198                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
199                         EVP_PKEY_free(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                 memset(key, 0, keylen);
210
211                 if (out == NULL)
212                         out=btmp;
213                 else
214                         BIO_push(out,btmp);
215                 btmp=NULL;
216                 }
217
218         if (bio == NULL) /* ??????????? */
219                 {
220                 if (p7->detached)
221                         bio=BIO_new(BIO_s_null());
222                 else
223                         {
224                         bio=BIO_new(BIO_s_mem());
225                         /* We need to set this so that when we have read all
226                          * the data, the encrypt BIO, if present, will read
227                          * EOF and encode the last few bytes */
228                         BIO_set_mem_eof_return(bio,0);
229
230                         if (PKCS7_type_is_signed(p7) &&
231                                 PKCS7_type_is_data(p7->d.sign->contents))
232                                 {
233                                 ASN1_OCTET_STRING *os;
234
235                                 os=p7->d.sign->contents->d.data;
236                                 if (os->length > 0)
237                                         BIO_write(bio,(char *)os->data,
238                                                 os->length);
239                                 }
240                         }
241                 }
242         BIO_push(out,bio);
243         bio=NULL;
244         if (0)
245                 {
246 err:
247                 if (out != NULL)
248                         BIO_free_all(out);
249                 if (btmp != NULL)
250                         BIO_free_all(btmp);
251                 out=NULL;
252                 }
253         return(out);
254         }
255
256 /* int */
257 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
258         {
259         int i,j;
260         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
261         char *tmp=NULL;
262         X509_ALGOR *xa;
263         ASN1_OCTET_STRING *data_body=NULL;
264         const EVP_MD *evp_md;
265         const EVP_CIPHER *evp_cipher=NULL;
266         EVP_CIPHER_CTX *evp_ctx=NULL;
267         X509_ALGOR *enc_alg=NULL;
268         STACK *md_sk=NULL,*rsk=NULL;
269         X509_ALGOR *xalg=NULL;
270         PKCS7_RECIP_INFO *ri=NULL;
271 /*      EVP_PKEY *pkey; */
272 #if 0
273         X509_STORE_CTX s_ctx;
274 #endif
275
276         i=OBJ_obj2nid(p7->type);
277         p7->state=PKCS7_S_HEADER;
278
279         switch (i)
280                 {
281         case NID_pkcs7_signed:
282                 data_body=p7->d.sign->contents->d.data;
283                 md_sk=p7->d.sign->md_algs;
284                 break;
285         case NID_pkcs7_signedAndEnveloped:
286                 rsk=p7->d.signed_and_enveloped->recipientinfo;
287                 md_sk=p7->d.signed_and_enveloped->md_algs;
288                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
289                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
290                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
291                 if (evp_cipher == NULL)
292                         {
293                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
294                         goto err;
295                         }
296                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
297                 break;
298         case NID_pkcs7_enveloped:
299                 rsk=p7->d.enveloped->recipientinfo;
300                 enc_alg=p7->d.enveloped->enc_data->algorithm;
301                 data_body=p7->d.enveloped->enc_data->enc_data;
302                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
303                 if (evp_cipher == NULL)
304                         {
305                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
306                         goto err;
307                         }
308                 xalg=p7->d.enveloped->enc_data->algorithm;
309                 break;
310         default:
311                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
312                 goto err;
313                 }
314
315         /* We will be checking the signature */
316         if (md_sk != NULL)
317                 {
318                 for (i=0; i<sk_num(md_sk); i++)
319                         {
320                         xa=(X509_ALGOR *)sk_value(md_sk,i);
321                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
322                                 {
323                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
324                                 goto err;
325                                 }
326
327                         j=OBJ_obj2nid(xa->algorithm);
328                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
329                         if (evp_md == NULL)
330                                 {
331                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
332                                 goto err;
333                                 }
334
335                         BIO_set_md(btmp,evp_md);
336                         if (out == NULL)
337                                 out=btmp;
338                         else
339                                 BIO_push(out,btmp);
340                         btmp=NULL;
341                         }
342                 }
343
344         if (evp_cipher != NULL)
345                 {
346 #if 0
347                 unsigned char key[EVP_MAX_KEY_LENGTH];
348                 unsigned char iv[EVP_MAX_IV_LENGTH];
349                 unsigned char *p;
350                 int keylen,ivlen;
351                 int max;
352                 X509_OBJECT ret;
353 #endif
354                 int jj;
355
356                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
357                         {
358                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
359                         goto err;
360                         }
361
362                 /* It was encrypted, we need to decrypt the secret key
363                  * with the private key */
364
365                 /* Find the recipientInfo which matches the passed certificate
366                  * (if any)
367                  */
368
369                 for (i=0; i<sk_num(rsk); i++) {
370                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
371                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
372                                         pcert->cert_info->issuer) &&
373                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
374                                         ri->issuer_and_serial->serial)) break;
375                         ri=NULL;
376                 }
377                 if (ri == NULL) {
378                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
379                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
380                         return(NULL);
381                 }
382
383                 jj=EVP_PKEY_size(pkey);
384                 tmp=Malloc(jj+10);
385                 if (tmp == NULL)
386                         {
387                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
388                         goto err;
389                         }
390
391                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
392                         ASN1_STRING_data(ri->enc_key),
393                         ASN1_STRING_length(ri->enc_key),
394                         pkey);
395                 if (jj <= 0)
396                         {
397                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
398                         goto err;
399                         }
400
401                 evp_ctx=NULL;
402                 BIO_get_cipher_ctx(etmp,&evp_ctx);
403                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
404                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
405                         return(NULL);
406
407                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
408                         {
409                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
410                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
411                         goto err;
412                         }
413                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
414
415                 memset(tmp,0,jj);
416
417                 if (out == NULL)
418                         out=etmp;
419                 else
420                         BIO_push(out,etmp);
421                 etmp=NULL;
422                 }
423
424 #if 1
425         if (p7->detached || (in_bio != NULL))
426                 {
427                 bio=in_bio;
428                 }
429         else 
430                 {
431                 bio=BIO_new(BIO_s_mem());
432                 /* We need to set this so that when we have read all
433                  * the data, the encrypt BIO, if present, will read
434                  * EOF and encode the last few bytes */
435                 BIO_set_mem_eof_return(bio,0);
436
437                 if (data_body->length > 0)
438                         BIO_write(bio,(char *)data_body->data,data_body->length);
439                 }
440         BIO_push(out,bio);
441         bio=NULL;
442 #endif
443         if (0)
444                 {
445 err:
446                 if (out != NULL) BIO_free_all(out);
447                 if (btmp != NULL) BIO_free_all(btmp);
448                 if (etmp != NULL) BIO_free_all(etmp);
449                 if (bio != NULL) BIO_free_all(bio);
450                 out=NULL;
451                 }
452         if (tmp != NULL)
453                 Free(tmp);
454         return(out);
455         }
456
457 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
458         {
459         int ret=0;
460         int i,j;
461         BIO *btmp;
462         BUF_MEM *buf_mem=NULL;
463         BUF_MEM *buf=NULL;
464         PKCS7_SIGNER_INFO *si;
465         EVP_MD_CTX *mdc,ctx_tmp;
466         STACK_OF(X509_ATTRIBUTE) *sk;
467         STACK *si_sk=NULL;
468         unsigned char *p,*pp=NULL;
469         int x;
470         ASN1_OCTET_STRING *os=NULL;
471
472         i=OBJ_obj2nid(p7->type);
473         p7->state=PKCS7_S_HEADER;
474
475         switch (i)
476                 {
477         case NID_pkcs7_signedAndEnveloped:
478                 /* XXXXXXXXXXXXXXXX */
479                 si_sk=p7->d.signed_and_enveloped->signer_info;
480                 os=ASN1_OCTET_STRING_new();
481                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
482                 break;
483         case NID_pkcs7_enveloped:
484                 /* XXXXXXXXXXXXXXXX */
485                 os=ASN1_OCTET_STRING_new();
486                 p7->d.enveloped->enc_data->enc_data=os;
487                 break;
488         case NID_pkcs7_signed:
489                 si_sk=p7->d.sign->signer_info;
490                 os=p7->d.sign->contents->d.data;
491                 /* If detached data then the content is excluded */
492                 if(p7->detached) {
493                         ASN1_OCTET_STRING_free(os);
494                         p7->d.sign->contents->d.data = NULL;
495                 }
496                 break;
497                 }
498
499         if (si_sk != NULL)
500                 {
501                 if ((buf=BUF_MEM_new()) == NULL)
502                         {
503                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
504                         goto err;
505                         }
506                 for (i=0; i<sk_num(si_sk); i++)
507                         {
508                         si=(PKCS7_SIGNER_INFO *)
509                                 sk_value(si_sk,i);
510                         if (si->pkey == NULL) continue;
511
512                         j=OBJ_obj2nid(si->digest_alg->algorithm);
513
514                         btmp=bio;
515                         for (;;)
516                                 {
517                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
518                                         == NULL)
519                                         {
520                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
521                                         goto err;
522                                         }
523                                 BIO_get_md_ctx(btmp,&mdc);
524                                 if (mdc == NULL)
525                                         {
526                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
527                                         goto err;
528                                         }
529                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
530                                         break;
531                                 else
532                                         btmp=btmp->next_bio;
533                                 }
534                         
535                         /* We now have the EVP_MD_CTX, lets do the
536                          * signing. */
537                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
538                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
539                                 {
540                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
541                                 goto err;
542                                 }
543
544                         sk=si->auth_attr;
545
546                         /* If there are attributes, we add the digest
547                          * attribute and only sign the attributes */
548                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
549                                 {
550                                 unsigned char md_data[EVP_MAX_MD_SIZE];
551                                 unsigned int md_len;
552                                 ASN1_OCTET_STRING *digest;
553                                 ASN1_UTCTIME *sign_time;
554                                 const EVP_MD *md_tmp;
555
556                                 /* Add signing time */
557                                 sign_time=X509_gmtime_adj(NULL,0);
558                                 PKCS7_add_signed_attribute(si,
559                                         NID_pkcs9_signingTime,
560                                         V_ASN1_UTCTIME,sign_time);
561
562                                 /* Add digest */
563                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
564                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
565                                 digest=ASN1_OCTET_STRING_new();
566                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
567                                 PKCS7_add_signed_attribute(si,
568                                         NID_pkcs9_messageDigest,
569                                         V_ASN1_OCTET_STRING,digest);
570
571                                 /* Now sign the mess */
572                                 EVP_SignInit(&ctx_tmp,md_tmp);
573                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
574                                            i2d_X509_ATTRIBUTE,
575                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
576                                 pp=(unsigned char *)Malloc(x);
577                                 p=pp;
578                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
579                                            i2d_X509_ATTRIBUTE,
580                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
581                                 EVP_SignUpdate(&ctx_tmp,pp,x);
582                                 Free(pp);
583                                 pp=NULL;
584                                 }
585
586                         if (si->pkey->type == EVP_PKEY_DSA)
587                                 ctx_tmp.digest=EVP_dss1();
588
589                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
590                                 (unsigned int *)&buf->length,si->pkey))
591                                 {
592                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
593                                 goto err;
594                                 }
595                         if (!ASN1_STRING_set(si->enc_digest,
596                                 (unsigned char *)buf->data,buf->length))
597                                 {
598                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
599                                 goto err;
600                                 }
601                         }
602                 }
603
604         if (!p7->detached)
605                 {
606                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
607                 if (btmp == NULL)
608                         {
609                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
610                         goto err;
611                         }
612                 BIO_get_mem_ptr(btmp,&buf_mem);
613                 ASN1_OCTET_STRING_set(os,
614                         (unsigned char *)buf_mem->data,buf_mem->length);
615                 }
616         if (pp != NULL) Free(pp);
617         pp=NULL;
618
619         ret=1;
620 err:
621         if (buf != NULL) BUF_MEM_free(buf);
622         return(ret);
623         }
624
625 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
626              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
627         {
628 /*      PKCS7_SIGNED *s; */
629         ASN1_OCTET_STRING *os;
630         EVP_MD_CTX mdc_tmp,*mdc;
631         unsigned char *pp,*p;
632         PKCS7_ISSUER_AND_SERIAL *ias;
633         int ret=0,i;
634         int md_type;
635         STACK_OF(X509_ATTRIBUTE) *sk;
636         STACK_OF(X509) *cert;
637         BIO *btmp;
638         X509 *x509;
639         EVP_PKEY *pkey;
640
641         if (PKCS7_type_is_signed(p7))
642                 {
643                 cert=p7->d.sign->cert;
644                 }
645         else if (PKCS7_type_is_signedAndEnveloped(p7))
646                 {
647                 cert=p7->d.signed_and_enveloped->cert;
648                 }
649         else
650                 {
651                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
652                 goto err;
653                 }
654         /* XXXXXXXXXXXXXXXXXXXXXXX */
655         ias=si->issuer_and_serial;
656
657         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
658
659         /* were we able to find the cert in passed to us */
660         if (x509 == NULL)
661                 {
662                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
663                 goto err;
664                 }
665
666         /* Lets verify */
667         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
668         i=X509_verify_cert(ctx);
669         if (i <= 0) 
670                 {
671                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
672                 goto err;
673                 }
674         X509_STORE_CTX_cleanup(ctx);
675
676         /* So we like 'x509', lets check the signature. */
677         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
678
679         btmp=bio;
680         for (;;)
681                 {
682                 if ((btmp == NULL) ||
683                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
684                         {
685                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
686                         goto err;
687                         }
688                 BIO_get_md_ctx(btmp,&mdc);
689                 if (mdc == NULL)
690                         {
691                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
692                         goto err;
693                         }
694                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
695                         break;
696                 btmp=btmp->next_bio;    
697                 }
698
699         /* mdc is the digest ctx that we want, unless there are attributes,
700          * in which case the digest is the signed attributes */
701         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
702
703         sk=si->auth_attr;
704         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
705                 {
706                 unsigned char md_dat[EVP_MAX_MD_SIZE];
707                 unsigned int md_len;
708                 ASN1_OCTET_STRING *message_digest;
709
710                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
711                 message_digest=PKCS7_digest_from_attributes(sk);
712                 if (!message_digest)
713                         {
714                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
715                         goto err;
716                         }
717                 if ((message_digest->length != (int)md_len) ||
718                         (memcmp(message_digest->data,md_dat,md_len)))
719                         {
720 #if 0
721 {
722 int ii;
723 for (ii=0; ii<message_digest->length; ii++)
724         printf("%02X",message_digest->data[ii]); printf(" sent\n");
725 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
726 }
727 #endif
728                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
729                         ret= -1;
730                         goto err;
731                         }
732
733                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
734                 /* Note: when forming the encoding of the attributes we
735                  * shouldn't reorder them or this will break the signature.
736                  * This is done by using the IS_SEQUENCE flag.
737                  */
738                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
739                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
740                 pp=Malloc(i);
741                 p=pp;
742                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
743                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
744                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
745
746                 Free(pp);
747                 }
748
749         os=si->enc_digest;
750         pkey = X509_get_pubkey(x509);
751         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
752
753         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
754         EVP_PKEY_free(pkey);
755         if (i <= 0)
756                 {
757                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
758                 ret= -1;
759                 goto err;
760                 }
761         else
762                 ret=1;
763 err:
764         return(ret);
765         }
766
767 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
768         {
769         STACK *rsk;
770         PKCS7_RECIP_INFO *ri;
771         int i;
772
773         i=OBJ_obj2nid(p7->type);
774         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
775         rsk=p7->d.signed_and_enveloped->recipientinfo;
776         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
777         if (sk_num(rsk) <= idx) return(NULL);
778         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
779         return(ri->issuer_and_serial);
780         }
781
782 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
783         {
784         return(get_attribute(si->auth_attr,nid));
785         }
786
787 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
788         {
789         return(get_attribute(si->unauth_attr,nid));
790         }
791
792 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
793         {
794         int i;
795         X509_ATTRIBUTE *xa;
796         ASN1_OBJECT *o;
797
798         o=OBJ_nid2obj(nid);
799         if (!o || !sk) return(NULL);
800         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
801                 {
802                 xa=sk_X509_ATTRIBUTE_value(sk,i);
803                 if (OBJ_cmp(xa->object,o) == 0)
804                         {
805                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
806                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
807                         else
808                                 return(NULL);
809                         }
810                 }
811         return(NULL);
812         }
813
814 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
815 {
816         ASN1_TYPE *astype;
817         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
818         return astype->value.octet_string;
819 }
820
821 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
822                                 STACK_OF(X509_ATTRIBUTE) *sk)
823         {
824         int i;
825
826         if (p7si->auth_attr != NULL)
827                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
828         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
829         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
830                 {
831                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
832                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
833                     == NULL)
834                         return(0);
835                 }
836         return(1);
837         }
838
839 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
840         {
841         int i;
842
843         if (p7si->unauth_attr != NULL)
844                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
845                                            X509_ATTRIBUTE_free);
846         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
847         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
848                 {
849                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
850                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
851                     == NULL)
852                         return(0);
853                 }
854         return(1);
855         }
856
857 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
858              void *value)
859         {
860         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
861         }
862
863 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
864              void *value)
865         {
866         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
867         }
868
869 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
870                          void *value)
871         {
872         X509_ATTRIBUTE *attr=NULL;
873
874         if (*sk == NULL)
875                 {
876                 *sk = sk_X509_ATTRIBUTE_new(NULL);
877 new_attrib:
878                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
879                 sk_X509_ATTRIBUTE_push(*sk,attr);
880                 }
881         else
882                 {
883                 int i;
884
885                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
886                         {
887                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
888                         if (OBJ_obj2nid(attr->object) == nid)
889                                 {
890                                 X509_ATTRIBUTE_free(attr);
891                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
892                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
893                                 goto end;
894                                 }
895                         }
896                 goto new_attrib;
897                 }
898 end:
899         return(1);
900         }
901