CORE SDI proposed patch doesn't make any sense. Undo.
[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_OF(PKCS7_RECIP_INFO) *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_PKCS7_RECIP_INFO_num(rsk); i++)
178                         {
179                         ri=sk_PKCS7_RECIP_INFO_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_PKCS7_RECIP_INFO_num(rsk); i++)
196                         {
197                         ri=sk_PKCS7_RECIP_INFO_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                         M_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                 if (p7->detached)
221                         bio=BIO_new(BIO_s_null());
222                 else {
223                         if (PKCS7_type_is_signed(p7) &&
224                                 PKCS7_type_is_data(p7->d.sign->contents)) {
225                                 ASN1_OCTET_STRING *os;
226                                 os=p7->d.sign->contents->d.data;
227                                 if (os->length > 0) bio = 
228                                         BIO_new_mem_buf(os->data, os->length);
229                         } 
230                         if(bio == NULL) {
231                                 bio=BIO_new(BIO_s_mem());
232                                 BIO_set_mem_eof_return(bio,0);
233                         }
234                 }
235         }
236         BIO_push(out,bio);
237         bio=NULL;
238         if (0)
239                 {
240 err:
241                 if (out != NULL)
242                         BIO_free_all(out);
243                 if (btmp != NULL)
244                         BIO_free_all(btmp);
245                 out=NULL;
246                 }
247         return(out);
248         }
249
250 /* int */
251 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
252         {
253         int i,j;
254         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
255         unsigned char *tmp=NULL;
256         X509_ALGOR *xa;
257         ASN1_OCTET_STRING *data_body=NULL;
258         const EVP_MD *evp_md;
259         const EVP_CIPHER *evp_cipher=NULL;
260         EVP_CIPHER_CTX *evp_ctx=NULL;
261         X509_ALGOR *enc_alg=NULL;
262         STACK_OF(X509_ALGOR) *md_sk=NULL;
263         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
264         X509_ALGOR *xalg=NULL;
265         PKCS7_RECIP_INFO *ri=NULL;
266         char is_rc2 = 0;
267 /*      EVP_PKEY *pkey; */
268 #if 0
269         X509_STORE_CTX s_ctx;
270 #endif
271
272         i=OBJ_obj2nid(p7->type);
273         p7->state=PKCS7_S_HEADER;
274
275         switch (i)
276                 {
277         case NID_pkcs7_signed:
278                 data_body=p7->d.sign->contents->d.data;
279                 md_sk=p7->d.sign->md_algs;
280                 break;
281         case NID_pkcs7_signedAndEnveloped:
282                 rsk=p7->d.signed_and_enveloped->recipientinfo;
283                 md_sk=p7->d.signed_and_enveloped->md_algs;
284                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
285                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
286                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
287                 if (evp_cipher == NULL)
288                         {
289                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
290                         goto err;
291                         }
292                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
293                 break;
294         case NID_pkcs7_enveloped:
295                 rsk=p7->d.enveloped->recipientinfo;
296                 enc_alg=p7->d.enveloped->enc_data->algorithm;
297                 data_body=p7->d.enveloped->enc_data->enc_data;
298                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
299                 if (evp_cipher == NULL)
300                         {
301                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
302                         goto err;
303                         }
304                 xalg=p7->d.enveloped->enc_data->algorithm;
305                 break;
306         default:
307                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
308                 goto err;
309                 }
310
311         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1; 
312
313         /* We will be checking the signature */
314         if (md_sk != NULL)
315                 {
316                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
317                         {
318                         xa=sk_X509_ALGOR_value(md_sk,i);
319                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
320                                 {
321                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
322                                 goto err;
323                                 }
324
325                         j=OBJ_obj2nid(xa->algorithm);
326                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
327                         if (evp_md == NULL)
328                                 {
329                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
330                                 goto err;
331                                 }
332
333                         BIO_set_md(btmp,evp_md);
334                         if (out == NULL)
335                                 out=btmp;
336                         else
337                                 BIO_push(out,btmp);
338                         btmp=NULL;
339                         }
340                 }
341
342         if (evp_cipher != NULL)
343                 {
344 #if 0
345                 unsigned char key[EVP_MAX_KEY_LENGTH];
346                 unsigned char iv[EVP_MAX_IV_LENGTH];
347                 unsigned char *p;
348                 int keylen,ivlen;
349                 int max;
350                 X509_OBJECT ret;
351 #endif
352                 int jj;
353
354                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
355                         {
356                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
357                         goto err;
358                         }
359
360                 /* It was encrypted, we need to decrypt the secret key
361                  * with the private key */
362
363                 /* Find the recipientInfo which matches the passed certificate
364                  * (if any)
365                  */
366
367                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
368                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
369                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
370                                         pcert->cert_info->issuer) &&
371                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
372                                         ri->issuer_and_serial->serial)) break;
373                         ri=NULL;
374                 }
375                 if (ri == NULL) {
376                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
377                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
378                         return(NULL);
379                 }
380
381                 jj=EVP_PKEY_size(pkey);
382                 tmp=(unsigned char *)Malloc(jj+10);
383                 if (tmp == NULL)
384                         {
385                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
386                         goto err;
387                         }
388
389                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
390                         M_ASN1_STRING_length(ri->enc_key), pkey);
391                 if (jj <= 0)
392                         {
393                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
394                         goto err;
395                         }
396
397                 evp_ctx=NULL;
398                 BIO_get_cipher_ctx(etmp,&evp_ctx);
399                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
400                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
401                         return(NULL);
402
403                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
404                         /* HACK: some S/MIME clients don't use the same key
405                          * and effective key length. The key length is
406                          * determined by the size of the decrypted RSA key.
407                          * So we hack things to manually set the RC2 key
408                          * because we currently can't do this with the EVP
409                          * interface.
410                          */
411                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
412                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
413                         else {
414
415                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
416                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
417                                 goto err;
418                         }
419                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
420
421                 memset(tmp,0,jj);
422
423                 if (out == NULL)
424                         out=etmp;
425                 else
426                         BIO_push(out,etmp);
427                 etmp=NULL;
428                 }
429
430 #if 1
431         if (p7->detached || (in_bio != NULL))
432                 {
433                 bio=in_bio;
434                 }
435         else 
436                 {
437 #if 0
438                 bio=BIO_new(BIO_s_mem());
439                 /* We need to set this so that when we have read all
440                  * the data, the encrypt BIO, if present, will read
441                  * EOF and encode the last few bytes */
442                 BIO_set_mem_eof_return(bio,0);
443
444                 if (data_body->length > 0)
445                         BIO_write(bio,(char *)data_body->data,data_body->length);
446 #else
447                 if (data_body->length > 0)
448                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
449                 else {
450                         bio=BIO_new(BIO_s_mem());
451                         BIO_set_mem_eof_return(bio,0);
452                 }
453 #endif
454                 }
455         BIO_push(out,bio);
456         bio=NULL;
457 #endif
458         if (0)
459                 {
460 err:
461                 if (out != NULL) BIO_free_all(out);
462                 if (btmp != NULL) BIO_free_all(btmp);
463                 if (etmp != NULL) BIO_free_all(etmp);
464                 if (bio != NULL) BIO_free_all(bio);
465                 out=NULL;
466                 }
467         if (tmp != NULL)
468                 Free(tmp);
469         return(out);
470         }
471
472 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
473         {
474         int ret=0;
475         int i,j;
476         BIO *btmp;
477         BUF_MEM *buf_mem=NULL;
478         BUF_MEM *buf=NULL;
479         PKCS7_SIGNER_INFO *si;
480         EVP_MD_CTX *mdc,ctx_tmp;
481         STACK_OF(X509_ATTRIBUTE) *sk;
482         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
483         unsigned char *p,*pp=NULL;
484         int x;
485         ASN1_OCTET_STRING *os=NULL;
486
487         i=OBJ_obj2nid(p7->type);
488         p7->state=PKCS7_S_HEADER;
489
490         switch (i)
491                 {
492         case NID_pkcs7_signedAndEnveloped:
493                 /* XXXXXXXXXXXXXXXX */
494                 si_sk=p7->d.signed_and_enveloped->signer_info;
495                 os=M_ASN1_OCTET_STRING_new();
496                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
497                 break;
498         case NID_pkcs7_enveloped:
499                 /* XXXXXXXXXXXXXXXX */
500                 os=M_ASN1_OCTET_STRING_new();
501                 p7->d.enveloped->enc_data->enc_data=os;
502                 break;
503         case NID_pkcs7_signed:
504                 si_sk=p7->d.sign->signer_info;
505                 os=p7->d.sign->contents->d.data;
506                 /* If detached data then the content is excluded */
507                 if(p7->detached) {
508                         M_ASN1_OCTET_STRING_free(os);
509                         p7->d.sign->contents->d.data = NULL;
510                 }
511                 break;
512                 }
513
514         if (si_sk != NULL)
515                 {
516                 if ((buf=BUF_MEM_new()) == NULL)
517                         {
518                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
519                         goto err;
520                         }
521                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
522                         {
523                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
524                         if (si->pkey == NULL) continue;
525
526                         j=OBJ_obj2nid(si->digest_alg->algorithm);
527
528                         btmp=bio;
529                         for (;;)
530                                 {
531                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
532                                         == NULL)
533                                         {
534                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
535                                         goto err;
536                                         }
537                                 BIO_get_md_ctx(btmp,&mdc);
538                                 if (mdc == NULL)
539                                         {
540                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
541                                         goto err;
542                                         }
543                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
544                                         break;
545                                 else
546                                         btmp=btmp->next_bio;
547                                 }
548                         
549                         /* We now have the EVP_MD_CTX, lets do the
550                          * signing. */
551                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
552                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
553                                 {
554                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
555                                 goto err;
556                                 }
557
558                         sk=si->auth_attr;
559
560                         /* If there are attributes, we add the digest
561                          * attribute and only sign the attributes */
562                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
563                                 {
564                                 unsigned char md_data[EVP_MAX_MD_SIZE];
565                                 unsigned int md_len;
566                                 ASN1_OCTET_STRING *digest;
567                                 ASN1_UTCTIME *sign_time;
568                                 const EVP_MD *md_tmp;
569
570                                 /* Add signing time */
571                                 sign_time=X509_gmtime_adj(NULL,0);
572                                 PKCS7_add_signed_attribute(si,
573                                         NID_pkcs9_signingTime,
574                                         V_ASN1_UTCTIME,sign_time);
575
576                                 /* Add digest */
577                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
578                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
579                                 digest=M_ASN1_OCTET_STRING_new();
580                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
581                                 PKCS7_add_signed_attribute(si,
582                                         NID_pkcs9_messageDigest,
583                                         V_ASN1_OCTET_STRING,digest);
584
585                                 /* Now sign the mess */
586                                 EVP_SignInit(&ctx_tmp,md_tmp);
587                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
588                                            i2d_X509_ATTRIBUTE,
589                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
590                                 pp=(unsigned char *)Malloc(x);
591                                 p=pp;
592                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
593                                            i2d_X509_ATTRIBUTE,
594                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
595                                 EVP_SignUpdate(&ctx_tmp,pp,x);
596                                 Free(pp);
597                                 pp=NULL;
598                                 }
599
600                         if (si->pkey->type == EVP_PKEY_DSA)
601                                 ctx_tmp.digest=EVP_dss1();
602
603                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
604                                 (unsigned int *)&buf->length,si->pkey))
605                                 {
606                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
607                                 goto err;
608                                 }
609                         if (!ASN1_STRING_set(si->enc_digest,
610                                 (unsigned char *)buf->data,buf->length))
611                                 {
612                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
613                                 goto err;
614                                 }
615                         }
616                 }
617
618         if (!p7->detached)
619                 {
620                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
621                 if (btmp == NULL)
622                         {
623                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
624                         goto err;
625                         }
626                 BIO_get_mem_ptr(btmp,&buf_mem);
627                 /* Mark the BIO read only then we can use its copy of the data
628                  * instead of making an extra copy.
629                  */
630                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
631                 BIO_set_mem_eof_return(btmp, 0);
632                 os->data = (unsigned char *)buf_mem->data;
633                 os->length = buf_mem->length;
634 #if 0
635                 M_ASN1_OCTET_STRING_set(os,
636                         (unsigned char *)buf_mem->data,buf_mem->length);
637 #endif
638                 }
639         if (pp != NULL) Free(pp);
640         pp=NULL;
641
642         ret=1;
643 err:
644         if (buf != NULL) BUF_MEM_free(buf);
645         return(ret);
646         }
647
648 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
649              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
650         {
651         PKCS7_ISSUER_AND_SERIAL *ias;
652         int ret=0,i;
653         STACK_OF(X509) *cert;
654         X509 *x509;
655
656         if (PKCS7_type_is_signed(p7))
657                 {
658                 cert=p7->d.sign->cert;
659                 }
660         else if (PKCS7_type_is_signedAndEnveloped(p7))
661                 {
662                 cert=p7->d.signed_and_enveloped->cert;
663                 }
664         else
665                 {
666                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
667                 goto err;
668                 }
669         /* XXXXXXXXXXXXXXXXXXXXXXX */
670         ias=si->issuer_and_serial;
671
672         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
673
674         /* were we able to find the cert in passed to us */
675         if (x509 == NULL)
676                 {
677                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
678                 goto err;
679                 }
680
681         /* Lets verify */
682         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
683         i=X509_verify_cert(ctx);
684         if (i <= 0) 
685                 {
686                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
687                 goto err;
688                 }
689         X509_STORE_CTX_cleanup(ctx);
690
691         return PKCS7_signatureVerify(bio, p7, si, x509);
692         err:
693         return ret;
694         }
695
696 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
697                                                                 X509 *x509)
698         {
699         ASN1_OCTET_STRING *os;
700         EVP_MD_CTX mdc_tmp,*mdc;
701         unsigned char *pp,*p;
702         int ret=0,i;
703         int md_type;
704         STACK_OF(X509_ATTRIBUTE) *sk;
705         BIO *btmp;
706         EVP_PKEY *pkey;
707
708         if (!PKCS7_type_is_signed(p7) && 
709                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
710                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
711                                                 PKCS7_R_WRONG_PKCS7_TYPE);
712                 goto err;
713         }
714
715         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
716
717         btmp=bio;
718         for (;;)
719                 {
720                 if ((btmp == NULL) ||
721                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
722                         {
723                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
724                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
725                         goto err;
726                         }
727                 BIO_get_md_ctx(btmp,&mdc);
728                 if (mdc == NULL)
729                         {
730                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
731                                                         PKCS7_R_INTERNAL_ERROR);
732                         goto err;
733                         }
734                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
735                         break;
736                 btmp=btmp->next_bio;    
737                 }
738
739         /* mdc is the digest ctx that we want, unless there are attributes,
740          * in which case the digest is the signed attributes */
741         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
742
743         sk=si->auth_attr;
744         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
745                 {
746                 unsigned char md_dat[EVP_MAX_MD_SIZE];
747                 unsigned int md_len;
748                 ASN1_OCTET_STRING *message_digest;
749
750                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
751                 message_digest=PKCS7_digest_from_attributes(sk);
752                 if (!message_digest)
753                         {
754                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
755                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
756                         goto err;
757                         }
758                 if ((message_digest->length != (int)md_len) ||
759                         (memcmp(message_digest->data,md_dat,md_len)))
760                         {
761 #if 0
762 {
763 int ii;
764 for (ii=0; ii<message_digest->length; ii++)
765         printf("%02X",message_digest->data[ii]); printf(" sent\n");
766 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
767 }
768 #endif
769                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
770                                                         PKCS7_R_DIGEST_FAILURE);
771                         ret= -1;
772                         goto err;
773                         }
774
775                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
776                 /* Note: when forming the encoding of the attributes we
777                  * shouldn't reorder them or this will break the signature.
778                  * This is done by using the IS_SEQUENCE flag.
779                  */
780                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
781                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
782                 pp=Malloc(i);
783                 p=pp;
784                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
785                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
786                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
787
788                 Free(pp);
789                 }
790
791         os=si->enc_digest;
792         pkey = X509_get_pubkey(x509);
793         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
794
795         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
796         EVP_PKEY_free(pkey);
797         if (i <= 0)
798                 {
799                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
800                                                 PKCS7_R_SIGNATURE_FAILURE);
801                 ret= -1;
802                 goto err;
803                 }
804         else
805                 ret=1;
806 err:
807         return(ret);
808         }
809
810 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
811         {
812         STACK_OF(PKCS7_RECIP_INFO) *rsk;
813         PKCS7_RECIP_INFO *ri;
814         int i;
815
816         i=OBJ_obj2nid(p7->type);
817         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
818         rsk=p7->d.signed_and_enveloped->recipientinfo;
819         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
820         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
821         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
822         return(ri->issuer_and_serial);
823         }
824
825 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
826         {
827         return(get_attribute(si->auth_attr,nid));
828         }
829
830 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
831         {
832         return(get_attribute(si->unauth_attr,nid));
833         }
834
835 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
836         {
837         int i;
838         X509_ATTRIBUTE *xa;
839         ASN1_OBJECT *o;
840
841         o=OBJ_nid2obj(nid);
842         if (!o || !sk) return(NULL);
843         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
844                 {
845                 xa=sk_X509_ATTRIBUTE_value(sk,i);
846                 if (OBJ_cmp(xa->object,o) == 0)
847                         {
848                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
849                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
850                         else
851                                 return(NULL);
852                         }
853                 }
854         return(NULL);
855         }
856
857 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
858 {
859         ASN1_TYPE *astype;
860         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
861         return astype->value.octet_string;
862 }
863
864 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
865                                 STACK_OF(X509_ATTRIBUTE) *sk)
866         {
867         int i;
868
869         if (p7si->auth_attr != NULL)
870                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
871         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
872         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
873                 {
874                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
875                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
876                     == NULL)
877                         return(0);
878                 }
879         return(1);
880         }
881
882 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
883         {
884         int i;
885
886         if (p7si->unauth_attr != NULL)
887                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
888                                            X509_ATTRIBUTE_free);
889         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
890         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
891                 {
892                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
893                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
894                     == NULL)
895                         return(0);
896                 }
897         return(1);
898         }
899
900 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
901              void *value)
902         {
903         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
904         }
905
906 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
907              void *value)
908         {
909         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
910         }
911
912 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
913                          void *value)
914         {
915         X509_ATTRIBUTE *attr=NULL;
916
917         if (*sk == NULL)
918                 {
919                 *sk = sk_X509_ATTRIBUTE_new(NULL);
920 new_attrib:
921                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
922                 sk_X509_ATTRIBUTE_push(*sk,attr);
923                 }
924         else
925                 {
926                 int i;
927
928                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
929                         {
930                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
931                         if (OBJ_obj2nid(attr->object) == nid)
932                                 {
933                                 X509_ATTRIBUTE_free(attr);
934                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
935                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
936                                 goto end;
937                                 }
938                         }
939                 goto new_attrib;
940                 }
941 end:
942         return(1);
943         }
944