acc9cc4a476f3e348fd8f89e9bae866881bb2816
[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 #include <openssl/x509v3.h>
65
66 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
67                          void *value);
68 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
69
70 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
71         {
72         int i,j;
73         BIO *out=NULL,*btmp=NULL;
74         X509_ALGOR *xa;
75         const EVP_MD *evp_md;
76         const EVP_CIPHER *evp_cipher=NULL;
77         STACK_OF(X509_ALGOR) *md_sk=NULL;
78         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
79         X509_ALGOR *xalg=NULL;
80         PKCS7_RECIP_INFO *ri=NULL;
81         EVP_PKEY *pkey;
82
83         i=OBJ_obj2nid(p7->type);
84         p7->state=PKCS7_S_HEADER;
85
86         switch (i)
87                 {
88         case NID_pkcs7_signed:
89                 md_sk=p7->d.sign->md_algs;
90                 break;
91         case NID_pkcs7_signedAndEnveloped:
92                 rsk=p7->d.signed_and_enveloped->recipientinfo;
93                 md_sk=p7->d.signed_and_enveloped->md_algs;
94                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
95                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
96                 if (evp_cipher == NULL)
97                         {
98                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
99                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
100                         goto err;
101                         }
102                 break;
103         case NID_pkcs7_enveloped:
104                 rsk=p7->d.enveloped->recipientinfo;
105                 xalg=p7->d.enveloped->enc_data->algorithm;
106                 evp_cipher=p7->d.enveloped->enc_data->cipher;
107                 if (evp_cipher == NULL)
108                         {
109                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
110                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
111                         goto err;
112                         }
113                 break;
114         default:
115                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
116                 goto err;
117                 }
118
119         if (md_sk != NULL)
120                 {
121                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
122                         {
123                         xa=sk_X509_ALGOR_value(md_sk,i);
124                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
125                                 {
126                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
127                                 goto err;
128                                 }
129
130                         j=OBJ_obj2nid(xa->algorithm);
131                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
132                         if (evp_md == NULL)
133                                 {
134                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
135                                 goto err;
136                                 }
137
138                         BIO_set_md(btmp,evp_md);
139                         if (out == NULL)
140                                 out=btmp;
141                         else
142                                 BIO_push(out,btmp);
143                         btmp=NULL;
144                         }
145                 }
146
147         if (evp_cipher != NULL)
148                 {
149                 unsigned char key[EVP_MAX_KEY_LENGTH];
150                 unsigned char iv[EVP_MAX_IV_LENGTH];
151                 int keylen,ivlen;
152                 int jj,max;
153                 unsigned char *tmp;
154                 EVP_CIPHER_CTX *ctx;
155
156                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
157                         {
158                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
159                         goto err;
160                         }
161                 BIO_get_cipher_ctx(btmp, &ctx);
162                 keylen=EVP_CIPHER_key_length(evp_cipher);
163                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
164                 RAND_bytes(key,keylen);
165                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
166                 if (ivlen > 0) RAND_bytes(iv,ivlen);
167                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
168
169                 if (ivlen > 0) {
170                         if (xalg->parameter == NULL) 
171                                                 xalg->parameter=ASN1_TYPE_new();
172                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
173                                                                        goto err;
174                 }
175
176                 /* Lets do the pub key stuff :-) */
177                 max=0;
178                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
179                         {
180                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
181                         if (ri->cert == NULL)
182                                 {
183                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
184                                 goto err;
185                                 }
186                         pkey=X509_get_pubkey(ri->cert);
187                         jj=EVP_PKEY_size(pkey);
188                         EVP_PKEY_free(pkey);
189                         if (max < jj) max=jj;
190                         }
191                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
192                         {
193                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
194                         goto err;
195                         }
196                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
197                         {
198                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
199                         pkey=X509_get_pubkey(ri->cert);
200                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
201                         EVP_PKEY_free(pkey);
202                         if (jj <= 0)
203                                 {
204                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
205                                 Free(tmp);
206                                 goto err;
207                                 }
208                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
209                         }
210                 Free(tmp);
211                 memset(key, 0, keylen);
212
213                 if (out == NULL)
214                         out=btmp;
215                 else
216                         BIO_push(out,btmp);
217                 btmp=NULL;
218                 }
219
220         if (bio == NULL) {
221                 if (p7->detached)
222                         bio=BIO_new(BIO_s_null());
223                 else {
224                         if (PKCS7_type_is_signed(p7) &&
225                                 PKCS7_type_is_data(p7->d.sign->contents)) {
226                                 ASN1_OCTET_STRING *os;
227                                 os=p7->d.sign->contents->d.data;
228                                 if (os->length > 0) bio = 
229                                         BIO_new_mem_buf(os->data, os->length);
230                         } 
231                         if(bio == NULL) {
232                                 bio=BIO_new(BIO_s_mem());
233                                 BIO_set_mem_eof_return(bio,0);
234                         }
235                 }
236         }
237         BIO_push(out,bio);
238         bio=NULL;
239         if (0)
240                 {
241 err:
242                 if (out != NULL)
243                         BIO_free_all(out);
244                 if (btmp != NULL)
245                         BIO_free_all(btmp);
246                 out=NULL;
247                 }
248         return(out);
249         }
250
251 /* int */
252 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
253         {
254         int i,j;
255         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
256         unsigned char *tmp=NULL;
257         X509_ALGOR *xa;
258         ASN1_OCTET_STRING *data_body=NULL;
259         const EVP_MD *evp_md;
260         const EVP_CIPHER *evp_cipher=NULL;
261         EVP_CIPHER_CTX *evp_ctx=NULL;
262         X509_ALGOR *enc_alg=NULL;
263         STACK_OF(X509_ALGOR) *md_sk=NULL;
264         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
265         X509_ALGOR *xalg=NULL;
266         PKCS7_RECIP_INFO *ri=NULL;
267         char is_rc2 = 0;
268 /*      EVP_PKEY *pkey; */
269 #if 0
270         X509_STORE_CTX s_ctx;
271 #endif
272
273         i=OBJ_obj2nid(p7->type);
274         p7->state=PKCS7_S_HEADER;
275
276         switch (i)
277                 {
278         case NID_pkcs7_signed:
279                 data_body=p7->d.sign->contents->d.data;
280                 md_sk=p7->d.sign->md_algs;
281                 break;
282         case NID_pkcs7_signedAndEnveloped:
283                 rsk=p7->d.signed_and_enveloped->recipientinfo;
284                 md_sk=p7->d.signed_and_enveloped->md_algs;
285                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
286                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
287                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
288                 if (evp_cipher == NULL)
289                         {
290                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
291                         goto err;
292                         }
293                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
294                 break;
295         case NID_pkcs7_enveloped:
296                 rsk=p7->d.enveloped->recipientinfo;
297                 enc_alg=p7->d.enveloped->enc_data->algorithm;
298                 data_body=p7->d.enveloped->enc_data->enc_data;
299                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
300                 if (evp_cipher == NULL)
301                         {
302                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
303                         goto err;
304                         }
305                 xalg=p7->d.enveloped->enc_data->algorithm;
306                 break;
307         default:
308                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
309                 goto err;
310                 }
311
312         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1; 
313
314         /* We will be checking the signature */
315         if (md_sk != NULL)
316                 {
317                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
318                         {
319                         xa=sk_X509_ALGOR_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_PKCS7_RECIP_INFO_num(rsk); i++) {
369                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
370                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
371                                         pcert->cert_info->issuer) &&
372                              !M_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=(unsigned char *)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(tmp, M_ASN1_STRING_data(ri->enc_key),
391                         M_ASN1_STRING_length(ri->enc_key), pkey);
392                 if (jj <= 0)
393                         {
394                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
395                         goto err;
396                         }
397
398                 evp_ctx=NULL;
399                 BIO_get_cipher_ctx(etmp,&evp_ctx);
400                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
401                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
402                         return(NULL);
403
404                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
405                         /* HACK: some S/MIME clients don't use the same key
406                          * and effective key length. The key length is
407                          * determined by the size of the decrypted RSA key.
408                          * So we hack things to manually set the RC2 key
409                          * because we currently can't do this with the EVP
410                          * interface.
411                          */
412                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
413                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
414                         else {
415
416                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
417                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
418                                 goto err;
419                         }
420                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
421
422                 memset(tmp,0,jj);
423
424                 if (out == NULL)
425                         out=etmp;
426                 else
427                         BIO_push(out,etmp);
428                 etmp=NULL;
429                 }
430
431 #if 1
432         if (p7->detached || (in_bio != NULL))
433                 {
434                 bio=in_bio;
435                 }
436         else 
437                 {
438 #if 0
439                 bio=BIO_new(BIO_s_mem());
440                 /* We need to set this so that when we have read all
441                  * the data, the encrypt BIO, if present, will read
442                  * EOF and encode the last few bytes */
443                 BIO_set_mem_eof_return(bio,0);
444
445                 if (data_body->length > 0)
446                         BIO_write(bio,(char *)data_body->data,data_body->length);
447 #else
448                 if (data_body->length > 0)
449                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
450                 else {
451                         bio=BIO_new(BIO_s_mem());
452                         BIO_set_mem_eof_return(bio,0);
453                 }
454 #endif
455                 }
456         BIO_push(out,bio);
457         bio=NULL;
458 #endif
459         if (0)
460                 {
461 err:
462                 if (out != NULL) BIO_free_all(out);
463                 if (btmp != NULL) BIO_free_all(btmp);
464                 if (etmp != NULL) BIO_free_all(etmp);
465                 if (bio != NULL) BIO_free_all(bio);
466                 out=NULL;
467                 }
468         if (tmp != NULL)
469                 Free(tmp);
470         return(out);
471         }
472
473 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
474         {
475         int ret=0;
476         int i,j;
477         BIO *btmp;
478         BUF_MEM *buf_mem=NULL;
479         BUF_MEM *buf=NULL;
480         PKCS7_SIGNER_INFO *si;
481         EVP_MD_CTX *mdc,ctx_tmp;
482         STACK_OF(X509_ATTRIBUTE) *sk;
483         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
484         unsigned char *p,*pp=NULL;
485         int x;
486         ASN1_OCTET_STRING *os=NULL;
487
488         i=OBJ_obj2nid(p7->type);
489         p7->state=PKCS7_S_HEADER;
490
491         switch (i)
492                 {
493         case NID_pkcs7_signedAndEnveloped:
494                 /* XXXXXXXXXXXXXXXX */
495                 si_sk=p7->d.signed_and_enveloped->signer_info;
496                 os=M_ASN1_OCTET_STRING_new();
497                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
498                 break;
499         case NID_pkcs7_enveloped:
500                 /* XXXXXXXXXXXXXXXX */
501                 os=M_ASN1_OCTET_STRING_new();
502                 p7->d.enveloped->enc_data->enc_data=os;
503                 break;
504         case NID_pkcs7_signed:
505                 si_sk=p7->d.sign->signer_info;
506                 os=p7->d.sign->contents->d.data;
507                 /* If detached data then the content is excluded */
508                 if(p7->detached) {
509                         M_ASN1_OCTET_STRING_free(os);
510                         p7->d.sign->contents->d.data = NULL;
511                 }
512                 break;
513                 }
514
515         if (si_sk != NULL)
516                 {
517                 if ((buf=BUF_MEM_new()) == NULL)
518                         {
519                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
520                         goto err;
521                         }
522                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
523                         {
524                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
525                         if (si->pkey == NULL) continue;
526
527                         j=OBJ_obj2nid(si->digest_alg->algorithm);
528
529                         btmp=bio;
530                         for (;;)
531                                 {
532                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
533                                         == NULL)
534                                         {
535                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
536                                         goto err;
537                                         }
538                                 BIO_get_md_ctx(btmp,&mdc);
539                                 if (mdc == NULL)
540                                         {
541                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
542                                         goto err;
543                                         }
544                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
545                                         break;
546                                 else
547                                         btmp=btmp->next_bio;
548                                 }
549                         
550                         /* We now have the EVP_MD_CTX, lets do the
551                          * signing. */
552                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
553                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
554                                 {
555                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
556                                 goto err;
557                                 }
558
559                         sk=si->auth_attr;
560
561                         /* If there are attributes, we add the digest
562                          * attribute and only sign the attributes */
563                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
564                                 {
565                                 unsigned char md_data[EVP_MAX_MD_SIZE];
566                                 unsigned int md_len;
567                                 ASN1_OCTET_STRING *digest;
568                                 ASN1_UTCTIME *sign_time;
569                                 const EVP_MD *md_tmp;
570
571                                 /* Add signing time */
572                                 sign_time=X509_gmtime_adj(NULL,0);
573                                 PKCS7_add_signed_attribute(si,
574                                         NID_pkcs9_signingTime,
575                                         V_ASN1_UTCTIME,sign_time);
576
577                                 /* Add digest */
578                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
579                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
580                                 digest=M_ASN1_OCTET_STRING_new();
581                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
582                                 PKCS7_add_signed_attribute(si,
583                                         NID_pkcs9_messageDigest,
584                                         V_ASN1_OCTET_STRING,digest);
585
586                                 /* Now sign the mess */
587                                 EVP_SignInit(&ctx_tmp,md_tmp);
588                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
589                                            i2d_X509_ATTRIBUTE,
590                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
591                                 pp=(unsigned char *)Malloc(x);
592                                 p=pp;
593                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
594                                            i2d_X509_ATTRIBUTE,
595                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
596                                 EVP_SignUpdate(&ctx_tmp,pp,x);
597                                 Free(pp);
598                                 pp=NULL;
599                                 }
600
601                         if (si->pkey->type == EVP_PKEY_DSA)
602                                 ctx_tmp.digest=EVP_dss1();
603
604                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
605                                 (unsigned int *)&buf->length,si->pkey))
606                                 {
607                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
608                                 goto err;
609                                 }
610                         if (!ASN1_STRING_set(si->enc_digest,
611                                 (unsigned char *)buf->data,buf->length))
612                                 {
613                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
614                                 goto err;
615                                 }
616                         }
617                 }
618
619         if (!p7->detached)
620                 {
621                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
622                 if (btmp == NULL)
623                         {
624                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
625                         goto err;
626                         }
627                 BIO_get_mem_ptr(btmp,&buf_mem);
628                 /* Mark the BIO read only then we can use its copy of the data
629                  * instead of making an extra copy.
630                  */
631                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
632                 BIO_set_mem_eof_return(btmp, 0);
633                 os->data = (unsigned char *)buf_mem->data;
634                 os->length = buf_mem->length;
635 #if 0
636                 M_ASN1_OCTET_STRING_set(os,
637                         (unsigned char *)buf_mem->data,buf_mem->length);
638 #endif
639                 }
640         if (pp != NULL) Free(pp);
641         pp=NULL;
642
643         ret=1;
644 err:
645         if (buf != NULL) BUF_MEM_free(buf);
646         return(ret);
647         }
648
649 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
650              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
651         {
652         PKCS7_ISSUER_AND_SERIAL *ias;
653         int ret=0,i;
654         STACK_OF(X509) *cert;
655         X509 *x509;
656
657         if (PKCS7_type_is_signed(p7))
658                 {
659                 cert=p7->d.sign->cert;
660                 }
661         else if (PKCS7_type_is_signedAndEnveloped(p7))
662                 {
663                 cert=p7->d.signed_and_enveloped->cert;
664                 }
665         else
666                 {
667                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
668                 goto err;
669                 }
670         /* XXXXXXXXXXXXXXXXXXXXXXX */
671         ias=si->issuer_and_serial;
672
673         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
674
675         /* were we able to find the cert in passed to us */
676         if (x509 == NULL)
677                 {
678                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
679                 goto err;
680                 }
681
682         /* Lets verify */
683         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
684         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
685         i=X509_verify_cert(ctx);
686         if (i <= 0) 
687                 {
688                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
689                 goto err;
690                 }
691         X509_STORE_CTX_cleanup(ctx);
692
693         return PKCS7_signatureVerify(bio, p7, si, x509);
694         err:
695         return ret;
696         }
697
698 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
699                                                                 X509 *x509)
700         {
701         ASN1_OCTET_STRING *os;
702         EVP_MD_CTX mdc_tmp,*mdc;
703         unsigned char *pp,*p;
704         int ret=0,i;
705         int md_type;
706         STACK_OF(X509_ATTRIBUTE) *sk;
707         BIO *btmp;
708         EVP_PKEY *pkey;
709
710         if (!PKCS7_type_is_signed(p7) && 
711                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
712                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
713                                                 PKCS7_R_WRONG_PKCS7_TYPE);
714                 goto err;
715         }
716
717         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
718
719         btmp=bio;
720         for (;;)
721                 {
722                 if ((btmp == NULL) ||
723                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
724                         {
725                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
726                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
727                         goto err;
728                         }
729                 BIO_get_md_ctx(btmp,&mdc);
730                 if (mdc == NULL)
731                         {
732                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
733                                                         PKCS7_R_INTERNAL_ERROR);
734                         goto err;
735                         }
736                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
737                         break;
738                 btmp=btmp->next_bio;    
739                 }
740
741         /* mdc is the digest ctx that we want, unless there are attributes,
742          * in which case the digest is the signed attributes */
743         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
744
745         sk=si->auth_attr;
746         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
747                 {
748                 unsigned char md_dat[EVP_MAX_MD_SIZE];
749                 unsigned int md_len;
750                 ASN1_OCTET_STRING *message_digest;
751
752                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
753                 message_digest=PKCS7_digest_from_attributes(sk);
754                 if (!message_digest)
755                         {
756                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
757                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
758                         goto err;
759                         }
760                 if ((message_digest->length != (int)md_len) ||
761                         (memcmp(message_digest->data,md_dat,md_len)))
762                         {
763 #if 0
764 {
765 int ii;
766 for (ii=0; ii<message_digest->length; ii++)
767         printf("%02X",message_digest->data[ii]); printf(" sent\n");
768 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
769 }
770 #endif
771                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
772                                                         PKCS7_R_DIGEST_FAILURE);
773                         ret= -1;
774                         goto err;
775                         }
776
777                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
778                 /* Note: when forming the encoding of the attributes we
779                  * shouldn't reorder them or this will break the signature.
780                  * This is done by using the IS_SEQUENCE flag.
781                  */
782                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
783                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
784                 pp=Malloc(i);
785                 p=pp;
786                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
787                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
788                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
789
790                 Free(pp);
791                 }
792
793         os=si->enc_digest;
794         pkey = X509_get_pubkey(x509);
795         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
796
797         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
798         EVP_PKEY_free(pkey);
799         if (i <= 0)
800                 {
801                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
802                                                 PKCS7_R_SIGNATURE_FAILURE);
803                 ret= -1;
804                 goto err;
805                 }
806         else
807                 ret=1;
808 err:
809         return(ret);
810         }
811
812 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
813         {
814         STACK_OF(PKCS7_RECIP_INFO) *rsk;
815         PKCS7_RECIP_INFO *ri;
816         int i;
817
818         i=OBJ_obj2nid(p7->type);
819         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
820         rsk=p7->d.signed_and_enveloped->recipientinfo;
821         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
822         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
823         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
824         return(ri->issuer_and_serial);
825         }
826
827 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
828         {
829         return(get_attribute(si->auth_attr,nid));
830         }
831
832 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
833         {
834         return(get_attribute(si->unauth_attr,nid));
835         }
836
837 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
838         {
839         int i;
840         X509_ATTRIBUTE *xa;
841         ASN1_OBJECT *o;
842
843         o=OBJ_nid2obj(nid);
844         if (!o || !sk) return(NULL);
845         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
846                 {
847                 xa=sk_X509_ATTRIBUTE_value(sk,i);
848                 if (OBJ_cmp(xa->object,o) == 0)
849                         {
850                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
851                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
852                         else
853                                 return(NULL);
854                         }
855                 }
856         return(NULL);
857         }
858
859 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
860 {
861         ASN1_TYPE *astype;
862         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
863         return astype->value.octet_string;
864 }
865
866 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
867                                 STACK_OF(X509_ATTRIBUTE) *sk)
868         {
869         int i;
870
871         if (p7si->auth_attr != NULL)
872                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
873         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
874         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
875                 {
876                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
877                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
878                     == NULL)
879                         return(0);
880                 }
881         return(1);
882         }
883
884 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
885         {
886         int i;
887
888         if (p7si->unauth_attr != NULL)
889                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
890                                            X509_ATTRIBUTE_free);
891         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
892         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
893                 {
894                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
895                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
896                     == NULL)
897                         return(0);
898                 }
899         return(1);
900         }
901
902 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
903              void *value)
904         {
905         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
906         }
907
908 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
909              void *value)
910         {
911         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
912         }
913
914 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
915                          void *value)
916         {
917         X509_ATTRIBUTE *attr=NULL;
918
919         if (*sk == NULL)
920                 {
921                 *sk = sk_X509_ATTRIBUTE_new(NULL);
922 new_attrib:
923                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
924                 sk_X509_ATTRIBUTE_push(*sk,attr);
925                 }
926         else
927                 {
928                 int i;
929
930                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
931                         {
932                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
933                         if (OBJ_obj2nid(attr->object) == nid)
934                                 {
935                                 X509_ATTRIBUTE_free(attr);
936                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
937                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
938                                 goto end;
939                                 }
940                         }
941                 goto new_attrib;
942                 }
943 end:
944         return(1);
945         }
946