make no-des and no-rc2 work.
[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 #ifndef NO_RC2
268         char is_rc2 = 0;
269 #endif
270 /*      EVP_PKEY *pkey; */
271 #if 0
272         X509_STORE_CTX s_ctx;
273 #endif
274
275         i=OBJ_obj2nid(p7->type);
276         p7->state=PKCS7_S_HEADER;
277
278         switch (i)
279                 {
280         case NID_pkcs7_signed:
281                 data_body=p7->d.sign->contents->d.data;
282                 md_sk=p7->d.sign->md_algs;
283                 break;
284         case NID_pkcs7_signedAndEnveloped:
285                 rsk=p7->d.signed_and_enveloped->recipientinfo;
286                 md_sk=p7->d.signed_and_enveloped->md_algs;
287                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
288                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
289                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
290                 if (evp_cipher == NULL)
291                         {
292                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
293                         goto err;
294                         }
295                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
296                 break;
297         case NID_pkcs7_enveloped:
298                 rsk=p7->d.enveloped->recipientinfo;
299                 enc_alg=p7->d.enveloped->enc_data->algorithm;
300                 data_body=p7->d.enveloped->enc_data->enc_data;
301                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
302                 if (evp_cipher == NULL)
303                         {
304                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
305                         goto err;
306                         }
307                 xalg=p7->d.enveloped->enc_data->algorithm;
308                 break;
309         default:
310                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
311                 goto err;
312                 }
313
314         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc)
315                 {
316 #ifndef NO_RC2          
317                 is_rc2 = 1; 
318 #else
319                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
320                 goto err;
321 #endif
322                 }
323
324         /* We will be checking the signature */
325         if (md_sk != NULL)
326                 {
327                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
328                         {
329                         xa=sk_X509_ALGOR_value(md_sk,i);
330                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
331                                 {
332                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
333                                 goto err;
334                                 }
335
336                         j=OBJ_obj2nid(xa->algorithm);
337                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
338                         if (evp_md == NULL)
339                                 {
340                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
341                                 goto err;
342                                 }
343
344                         BIO_set_md(btmp,evp_md);
345                         if (out == NULL)
346                                 out=btmp;
347                         else
348                                 BIO_push(out,btmp);
349                         btmp=NULL;
350                         }
351                 }
352
353         if (evp_cipher != NULL)
354                 {
355 #if 0
356                 unsigned char key[EVP_MAX_KEY_LENGTH];
357                 unsigned char iv[EVP_MAX_IV_LENGTH];
358                 unsigned char *p;
359                 int keylen,ivlen;
360                 int max;
361                 X509_OBJECT ret;
362 #endif
363                 int jj;
364
365                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
366                         {
367                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
368                         goto err;
369                         }
370
371                 /* It was encrypted, we need to decrypt the secret key
372                  * with the private key */
373
374                 /* Find the recipientInfo which matches the passed certificate
375                  * (if any)
376                  */
377
378                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
379                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
380                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
381                                         pcert->cert_info->issuer) &&
382                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
383                                         ri->issuer_and_serial->serial)) break;
384                         ri=NULL;
385                 }
386                 if (ri == NULL) {
387                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
388                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
389                         return(NULL);
390                 }
391
392                 jj=EVP_PKEY_size(pkey);
393                 tmp=(unsigned char *)Malloc(jj+10);
394                 if (tmp == NULL)
395                         {
396                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
397                         goto err;
398                         }
399
400                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
401                         M_ASN1_STRING_length(ri->enc_key), pkey);
402                 if (jj <= 0)
403                         {
404                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
405                         goto err;
406                         }
407
408                 evp_ctx=NULL;
409                 BIO_get_cipher_ctx(etmp,&evp_ctx);
410                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
411                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
412                         return(NULL);
413
414                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
415                         /* HACK: some S/MIME clients don't use the same key
416                          * and effective key length. The key length is
417                          * determined by the size of the decrypted RSA key.
418                          * So we hack things to manually set the RC2 key
419                          * because we currently can't do this with the EVP
420                          * interface.
421                          */
422 #ifndef NO_RC2          
423                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
424                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
425                         else
426 #endif
427                                 {
428                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
429                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
430                                 goto err;
431                                 }
432                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
433
434                 memset(tmp,0,jj);
435
436                 if (out == NULL)
437                         out=etmp;
438                 else
439                         BIO_push(out,etmp);
440                 etmp=NULL;
441                 }
442
443 #if 1
444         if (p7->detached || (in_bio != NULL))
445                 {
446                 bio=in_bio;
447                 }
448         else 
449                 {
450 #if 0
451                 bio=BIO_new(BIO_s_mem());
452                 /* We need to set this so that when we have read all
453                  * the data, the encrypt BIO, if present, will read
454                  * EOF and encode the last few bytes */
455                 BIO_set_mem_eof_return(bio,0);
456
457                 if (data_body->length > 0)
458                         BIO_write(bio,(char *)data_body->data,data_body->length);
459 #else
460                 if (data_body->length > 0)
461                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
462                 else {
463                         bio=BIO_new(BIO_s_mem());
464                         BIO_set_mem_eof_return(bio,0);
465                 }
466 #endif
467                 }
468         BIO_push(out,bio);
469         bio=NULL;
470 #endif
471         if (0)
472                 {
473 err:
474                 if (out != NULL) BIO_free_all(out);
475                 if (btmp != NULL) BIO_free_all(btmp);
476                 if (etmp != NULL) BIO_free_all(etmp);
477                 if (bio != NULL) BIO_free_all(bio);
478                 out=NULL;
479                 }
480         if (tmp != NULL)
481                 Free(tmp);
482         return(out);
483         }
484
485 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
486         {
487         int ret=0;
488         int i,j;
489         BIO *btmp;
490         BUF_MEM *buf_mem=NULL;
491         BUF_MEM *buf=NULL;
492         PKCS7_SIGNER_INFO *si;
493         EVP_MD_CTX *mdc,ctx_tmp;
494         STACK_OF(X509_ATTRIBUTE) *sk;
495         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
496         unsigned char *p,*pp=NULL;
497         int x;
498         ASN1_OCTET_STRING *os=NULL;
499
500         i=OBJ_obj2nid(p7->type);
501         p7->state=PKCS7_S_HEADER;
502
503         switch (i)
504                 {
505         case NID_pkcs7_signedAndEnveloped:
506                 /* XXXXXXXXXXXXXXXX */
507                 si_sk=p7->d.signed_and_enveloped->signer_info;
508                 os=M_ASN1_OCTET_STRING_new();
509                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
510                 break;
511         case NID_pkcs7_enveloped:
512                 /* XXXXXXXXXXXXXXXX */
513                 os=M_ASN1_OCTET_STRING_new();
514                 p7->d.enveloped->enc_data->enc_data=os;
515                 break;
516         case NID_pkcs7_signed:
517                 si_sk=p7->d.sign->signer_info;
518                 os=p7->d.sign->contents->d.data;
519                 /* If detached data then the content is excluded */
520                 if(p7->detached) {
521                         M_ASN1_OCTET_STRING_free(os);
522                         p7->d.sign->contents->d.data = NULL;
523                 }
524                 break;
525                 }
526
527         if (si_sk != NULL)
528                 {
529                 if ((buf=BUF_MEM_new()) == NULL)
530                         {
531                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
532                         goto err;
533                         }
534                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
535                         {
536                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
537                         if (si->pkey == NULL) continue;
538
539                         j=OBJ_obj2nid(si->digest_alg->algorithm);
540
541                         btmp=bio;
542                         for (;;)
543                                 {
544                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
545                                         == NULL)
546                                         {
547                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
548                                         goto err;
549                                         }
550                                 BIO_get_md_ctx(btmp,&mdc);
551                                 if (mdc == NULL)
552                                         {
553                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
554                                         goto err;
555                                         }
556                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
557                                         break;
558                                 else
559                                         btmp=btmp->next_bio;
560                                 }
561                         
562                         /* We now have the EVP_MD_CTX, lets do the
563                          * signing. */
564                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
565                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
566                                 {
567                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
568                                 goto err;
569                                 }
570
571                         sk=si->auth_attr;
572
573                         /* If there are attributes, we add the digest
574                          * attribute and only sign the attributes */
575                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
576                                 {
577                                 unsigned char md_data[EVP_MAX_MD_SIZE];
578                                 unsigned int md_len;
579                                 ASN1_OCTET_STRING *digest;
580                                 ASN1_UTCTIME *sign_time;
581                                 const EVP_MD *md_tmp;
582
583                                 /* Add signing time */
584                                 sign_time=X509_gmtime_adj(NULL,0);
585                                 PKCS7_add_signed_attribute(si,
586                                         NID_pkcs9_signingTime,
587                                         V_ASN1_UTCTIME,sign_time);
588
589                                 /* Add digest */
590                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
591                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
592                                 digest=M_ASN1_OCTET_STRING_new();
593                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
594                                 PKCS7_add_signed_attribute(si,
595                                         NID_pkcs9_messageDigest,
596                                         V_ASN1_OCTET_STRING,digest);
597
598                                 /* Now sign the mess */
599                                 EVP_SignInit(&ctx_tmp,md_tmp);
600                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
601                                            i2d_X509_ATTRIBUTE,
602                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
603                                 pp=(unsigned char *)Malloc(x);
604                                 p=pp;
605                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
606                                            i2d_X509_ATTRIBUTE,
607                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
608                                 EVP_SignUpdate(&ctx_tmp,pp,x);
609                                 Free(pp);
610                                 pp=NULL;
611                                 }
612
613                         if (si->pkey->type == EVP_PKEY_DSA)
614                                 ctx_tmp.digest=EVP_dss1();
615
616                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
617                                 (unsigned int *)&buf->length,si->pkey))
618                                 {
619                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
620                                 goto err;
621                                 }
622                         if (!ASN1_STRING_set(si->enc_digest,
623                                 (unsigned char *)buf->data,buf->length))
624                                 {
625                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
626                                 goto err;
627                                 }
628                         }
629                 }
630
631         if (!p7->detached)
632                 {
633                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
634                 if (btmp == NULL)
635                         {
636                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
637                         goto err;
638                         }
639                 BIO_get_mem_ptr(btmp,&buf_mem);
640                 /* Mark the BIO read only then we can use its copy of the data
641                  * instead of making an extra copy.
642                  */
643                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
644                 BIO_set_mem_eof_return(btmp, 0);
645                 os->data = (unsigned char *)buf_mem->data;
646                 os->length = buf_mem->length;
647 #if 0
648                 M_ASN1_OCTET_STRING_set(os,
649                         (unsigned char *)buf_mem->data,buf_mem->length);
650 #endif
651                 }
652         if (pp != NULL) Free(pp);
653         pp=NULL;
654
655         ret=1;
656 err:
657         if (buf != NULL) BUF_MEM_free(buf);
658         return(ret);
659         }
660
661 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
662              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
663         {
664         PKCS7_ISSUER_AND_SERIAL *ias;
665         int ret=0,i;
666         STACK_OF(X509) *cert;
667         X509 *x509;
668
669         if (PKCS7_type_is_signed(p7))
670                 {
671                 cert=p7->d.sign->cert;
672                 }
673         else if (PKCS7_type_is_signedAndEnveloped(p7))
674                 {
675                 cert=p7->d.signed_and_enveloped->cert;
676                 }
677         else
678                 {
679                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
680                 goto err;
681                 }
682         /* XXXXXXXXXXXXXXXXXXXXXXX */
683         ias=si->issuer_and_serial;
684
685         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
686
687         /* were we able to find the cert in passed to us */
688         if (x509 == NULL)
689                 {
690                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
691                 goto err;
692                 }
693
694         /* Lets verify */
695         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
696         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
697         i=X509_verify_cert(ctx);
698         if (i <= 0) 
699                 {
700                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
701                 goto err;
702                 }
703         X509_STORE_CTX_cleanup(ctx);
704
705         return PKCS7_signatureVerify(bio, p7, si, x509);
706         err:
707         return ret;
708         }
709
710 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
711                                                                 X509 *x509)
712         {
713         ASN1_OCTET_STRING *os;
714         EVP_MD_CTX mdc_tmp,*mdc;
715         unsigned char *pp,*p;
716         int ret=0,i;
717         int md_type;
718         STACK_OF(X509_ATTRIBUTE) *sk;
719         BIO *btmp;
720         EVP_PKEY *pkey;
721
722         if (!PKCS7_type_is_signed(p7) && 
723                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
724                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
725                                                 PKCS7_R_WRONG_PKCS7_TYPE);
726                 goto err;
727         }
728
729         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
730
731         btmp=bio;
732         for (;;)
733                 {
734                 if ((btmp == NULL) ||
735                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
736                         {
737                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
738                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
739                         goto err;
740                         }
741                 BIO_get_md_ctx(btmp,&mdc);
742                 if (mdc == NULL)
743                         {
744                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
745                                                         PKCS7_R_INTERNAL_ERROR);
746                         goto err;
747                         }
748                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
749                         break;
750                 btmp=btmp->next_bio;    
751                 }
752
753         /* mdc is the digest ctx that we want, unless there are attributes,
754          * in which case the digest is the signed attributes */
755         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
756
757         sk=si->auth_attr;
758         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
759                 {
760                 unsigned char md_dat[EVP_MAX_MD_SIZE];
761                 unsigned int md_len;
762                 ASN1_OCTET_STRING *message_digest;
763
764                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
765                 message_digest=PKCS7_digest_from_attributes(sk);
766                 if (!message_digest)
767                         {
768                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
769                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
770                         goto err;
771                         }
772                 if ((message_digest->length != (int)md_len) ||
773                         (memcmp(message_digest->data,md_dat,md_len)))
774                         {
775 #if 0
776 {
777 int ii;
778 for (ii=0; ii<message_digest->length; ii++)
779         printf("%02X",message_digest->data[ii]); printf(" sent\n");
780 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
781 }
782 #endif
783                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
784                                                         PKCS7_R_DIGEST_FAILURE);
785                         ret= -1;
786                         goto err;
787                         }
788
789                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
790                 /* Note: when forming the encoding of the attributes we
791                  * shouldn't reorder them or this will break the signature.
792                  * This is done by using the IS_SEQUENCE flag.
793                  */
794                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
795                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
796                 pp=Malloc(i);
797                 p=pp;
798                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
799                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
800                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
801
802                 Free(pp);
803                 }
804
805         os=si->enc_digest;
806         pkey = X509_get_pubkey(x509);
807         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
808
809         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
810         EVP_PKEY_free(pkey);
811         if (i <= 0)
812                 {
813                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
814                                                 PKCS7_R_SIGNATURE_FAILURE);
815                 ret= -1;
816                 goto err;
817                 }
818         else
819                 ret=1;
820 err:
821         return(ret);
822         }
823
824 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
825         {
826         STACK_OF(PKCS7_RECIP_INFO) *rsk;
827         PKCS7_RECIP_INFO *ri;
828         int i;
829
830         i=OBJ_obj2nid(p7->type);
831         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
832         rsk=p7->d.signed_and_enveloped->recipientinfo;
833         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
834         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
835         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
836         return(ri->issuer_and_serial);
837         }
838
839 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
840         {
841         return(get_attribute(si->auth_attr,nid));
842         }
843
844 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
845         {
846         return(get_attribute(si->unauth_attr,nid));
847         }
848
849 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
850         {
851         int i;
852         X509_ATTRIBUTE *xa;
853         ASN1_OBJECT *o;
854
855         o=OBJ_nid2obj(nid);
856         if (!o || !sk) return(NULL);
857         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
858                 {
859                 xa=sk_X509_ATTRIBUTE_value(sk,i);
860                 if (OBJ_cmp(xa->object,o) == 0)
861                         {
862                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
863                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
864                         else
865                                 return(NULL);
866                         }
867                 }
868         return(NULL);
869         }
870
871 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
872 {
873         ASN1_TYPE *astype;
874         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
875         return astype->value.octet_string;
876 }
877
878 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
879                                 STACK_OF(X509_ATTRIBUTE) *sk)
880         {
881         int i;
882
883         if (p7si->auth_attr != NULL)
884                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
885         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
886         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
887                 {
888                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
889                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
890                     == NULL)
891                         return(0);
892                 }
893         return(1);
894         }
895
896 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
897         {
898         int i;
899
900         if (p7si->unauth_attr != NULL)
901                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
902                                            X509_ATTRIBUTE_free);
903         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
904         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
905                 {
906                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
907                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
908                     == NULL)
909                         return(0);
910                 }
911         return(1);
912         }
913
914 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
915              void *value)
916         {
917         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
918         }
919
920 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
921              void *value)
922         {
923         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
924         }
925
926 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
927                          void *value)
928         {
929         X509_ATTRIBUTE *attr=NULL;
930
931         if (*sk == NULL)
932                 {
933                 *sk = sk_X509_ATTRIBUTE_new(NULL);
934 new_attrib:
935                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
936                 sk_X509_ATTRIBUTE_push(*sk,attr);
937                 }
938         else
939                 {
940                 int i;
941
942                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
943                         {
944                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
945                         if (OBJ_obj2nid(attr->object) == nid)
946                                 {
947                                 X509_ATTRIBUTE_free(attr);
948                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
949                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
950                                 goto end;
951                                 }
952                         }
953                 goto new_attrib;
954                 }
955 end:
956         return(1);
957         }
958