cb8434b322957b7a33eb52b4fb1a6735d5e179b4
[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 #include <openssl/err.h>
66
67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
68                          void *value);
69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
70
71 static int PKCS7_type_is_other(PKCS7* p7)
72         {
73         int isOther=1;
74         
75         int nid=OBJ_obj2nid(p7->type);
76
77         switch( nid )
78                 {
79         case NID_pkcs7_data:
80         case NID_pkcs7_signed:
81         case NID_pkcs7_enveloped:
82         case NID_pkcs7_signedAndEnveloped:
83         case NID_pkcs7_digest:
84         case NID_pkcs7_encrypted:
85                 isOther=0;
86                 break;
87         default:
88                 isOther=1;
89                 }
90
91         return isOther;
92
93         }
94
95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
96         {
97         if ( PKCS7_type_is_data(p7))
98                 return p7->d.data;
99         if ( PKCS7_type_is_other(p7) && p7->d.other
100                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
101                 return p7->d.other->value.octet_string;
102         return NULL;
103         }
104
105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
106         {
107         BIO *btmp;
108         const EVP_MD *md;
109         if ((btmp=BIO_new(BIO_f_md())) == NULL)
110                 {
111                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
112                 goto err;
113                 }
114
115         md=EVP_get_digestbyobj(alg->algorithm);
116         if (md == NULL)
117                 {
118                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
119                 goto err;
120                 }
121
122         BIO_set_md(btmp,md);
123         if (*pbio == NULL)
124                 *pbio=btmp;
125         else if (!BIO_push(*pbio,btmp))
126                 {
127                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
128                 goto err;
129                 }
130         btmp=NULL;
131
132         return 1;
133
134         err:
135         if (btmp)
136                 BIO_free(btmp);
137         return 0;
138
139         }
140
141 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
142                                         unsigned char *key, int keylen)
143         {
144         EVP_PKEY_CTX *pctx = NULL;
145         EVP_PKEY *pkey = NULL;
146         unsigned char *ek = NULL;
147         int ret = 0;
148         size_t eklen;
149
150         pkey = X509_get_pubkey(ri->cert);
151
152         if (!pkey)
153                 return 0;
154
155         pctx = EVP_PKEY_CTX_new(pkey, NULL);
156         if (!pctx)
157                 return 0;
158
159         if (EVP_PKEY_encrypt_init(pctx) <= 0)
160                 goto err;
161
162         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
163                                 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
164                 {
165                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
166                 goto err;
167                 }
168
169         if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
170                 goto err;
171
172         ek = OPENSSL_malloc(eklen);
173
174         if (ek == NULL)
175                 {
176                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
177                 goto err;
178                 }
179
180         if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
181                 goto err;
182
183         ASN1_STRING_set0(ri->enc_key, ek, eklen);
184         ek = NULL;
185
186         ret = 1;
187
188         err:
189         if (pkey)
190                 EVP_PKEY_free(pkey);
191         if (pctx)
192                 EVP_PKEY_CTX_free(pctx);
193         if (ek)
194                 OPENSSL_free(ek);
195         return ret;
196
197         }
198
199
200 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
201                                PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
202         {
203         EVP_PKEY_CTX *pctx = NULL;
204         unsigned char *ek = NULL;
205         size_t eklen;
206
207         int ret = 0;
208
209         pctx = EVP_PKEY_CTX_new(pkey, NULL);
210         if (!pctx)
211                 return 0;
212
213         if (EVP_PKEY_decrypt_init(pctx) <= 0)
214                 goto err;
215
216         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
217                                 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
218                 {
219                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
220                 goto err;
221                 }
222
223         if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
224                                 ri->enc_key->data, ri->enc_key->length) <= 0)
225                 goto err;
226
227         ek = OPENSSL_malloc(eklen);
228
229         if (ek == NULL)
230                 {
231                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
232                 goto err;
233                 }
234
235         if (EVP_PKEY_decrypt(pctx, ek, &eklen,
236                                 ri->enc_key->data, ri->enc_key->length) <= 0)
237                 {
238                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
239                 goto err;
240                 }
241
242         ret = 1;
243
244         *pek = ek;
245         *peklen = eklen;
246
247         err:
248         if (pctx)
249                 EVP_PKEY_CTX_free(pctx);
250         if (!ret && ek)
251                 OPENSSL_free(ek);
252
253         return ret;
254         }
255
256 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
257         {
258         int i;
259         BIO *out=NULL,*btmp=NULL;
260         X509_ALGOR *xa = NULL;
261         const EVP_CIPHER *evp_cipher=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         ASN1_OCTET_STRING *os=NULL;
267
268         i=OBJ_obj2nid(p7->type);
269         p7->state=PKCS7_S_HEADER;
270
271         switch (i)
272                 {
273         case NID_pkcs7_signed:
274                 md_sk=p7->d.sign->md_algs;
275                 os = PKCS7_get_octet_string(p7->d.sign->contents);
276                 break;
277         case NID_pkcs7_signedAndEnveloped:
278                 rsk=p7->d.signed_and_enveloped->recipientinfo;
279                 md_sk=p7->d.signed_and_enveloped->md_algs;
280                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
281                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
282                 if (evp_cipher == NULL)
283                         {
284                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
285                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
286                         goto err;
287                         }
288                 break;
289         case NID_pkcs7_enveloped:
290                 rsk=p7->d.enveloped->recipientinfo;
291                 xalg=p7->d.enveloped->enc_data->algorithm;
292                 evp_cipher=p7->d.enveloped->enc_data->cipher;
293                 if (evp_cipher == NULL)
294                         {
295                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
296                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
297                         goto err;
298                         }
299                 break;
300         case NID_pkcs7_digest:
301                 xa = p7->d.digest->md;
302                 os = PKCS7_get_octet_string(p7->d.digest->contents);
303                 break;
304         case NID_pkcs7_data:
305                 break;
306         default:
307                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
308                 goto err;
309                 }
310
311         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
312                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
313                         goto err;
314
315         if (xa && !PKCS7_bio_add_digest(&out, xa))
316                         goto err;
317
318         if (evp_cipher != NULL)
319                 {
320                 unsigned char key[EVP_MAX_KEY_LENGTH];
321                 unsigned char iv[EVP_MAX_IV_LENGTH];
322                 int keylen,ivlen;
323                 EVP_CIPHER_CTX *ctx;
324
325                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
326                         {
327                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
328                         goto err;
329                         }
330                 BIO_get_cipher_ctx(btmp, &ctx);
331                 keylen=EVP_CIPHER_key_length(evp_cipher);
332                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
333                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
334                 if (ivlen > 0)
335                         if (RAND_pseudo_bytes(iv,ivlen) <= 0)
336                                 goto err;
337                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
338                         goto err;
339                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
340                         goto err;
341                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
342                         goto err;
343
344                 if (ivlen > 0) {
345                         if (xalg->parameter == NULL) {
346                                 xalg->parameter = ASN1_TYPE_new();
347                                 if (xalg->parameter == NULL)
348                                         goto err;
349                         }
350                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
351                                 goto err;
352                 }
353
354                 /* Lets do the pub key stuff :-) */
355                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
356                         {
357                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
358                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
359                                 goto err;
360                         }
361                 OPENSSL_cleanse(key, keylen);
362
363                 if (out == NULL)
364                         out=btmp;
365                 else
366                         BIO_push(out,btmp);
367                 btmp=NULL;
368                 }
369
370         if (bio == NULL)
371                 {
372                 if (PKCS7_is_detached(p7))
373                         bio=BIO_new(BIO_s_null());
374                 else if (os && os->length > 0)
375                         bio = BIO_new_mem_buf(os->data, os->length);
376                 if(bio == NULL)
377                         {
378                         bio=BIO_new(BIO_s_mem());
379                         if (bio == NULL)
380                                 goto err;
381                         BIO_set_mem_eof_return(bio,0);
382                         }
383                 }
384         if (out)
385                 BIO_push(out,bio);
386         else
387                 out = bio;
388         bio=NULL;
389         if (0)
390                 {
391 err:
392                 if (out != NULL)
393                         BIO_free_all(out);
394                 if (btmp != NULL)
395                         BIO_free_all(btmp);
396                 out=NULL;
397                 }
398         return(out);
399         }
400
401 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
402         {
403         int ret;
404         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
405                                 pcert->cert_info->issuer);
406         if (ret)
407                 return ret;
408         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
409                                         ri->issuer_and_serial->serial);
410         }
411
412 /* int */
413 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
414         {
415         int i,j;
416         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
417         X509_ALGOR *xa;
418         ASN1_OCTET_STRING *data_body=NULL;
419         const EVP_MD *evp_md;
420         const EVP_CIPHER *evp_cipher=NULL;
421         EVP_CIPHER_CTX *evp_ctx=NULL;
422         X509_ALGOR *enc_alg=NULL;
423         STACK_OF(X509_ALGOR) *md_sk=NULL;
424         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
425         PKCS7_RECIP_INFO *ri=NULL;
426
427         i=OBJ_obj2nid(p7->type);
428         p7->state=PKCS7_S_HEADER;
429
430         switch (i)
431                 {
432         case NID_pkcs7_signed:
433                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
434                 md_sk=p7->d.sign->md_algs;
435                 break;
436         case NID_pkcs7_signedAndEnveloped:
437                 rsk=p7->d.signed_and_enveloped->recipientinfo;
438                 md_sk=p7->d.signed_and_enveloped->md_algs;
439                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
440                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
441                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
442                 if (evp_cipher == NULL)
443                         {
444                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
445                         goto err;
446                         }
447                 break;
448         case NID_pkcs7_enveloped:
449                 rsk=p7->d.enveloped->recipientinfo;
450                 enc_alg=p7->d.enveloped->enc_data->algorithm;
451                 data_body=p7->d.enveloped->enc_data->enc_data;
452                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
453                 if (evp_cipher == NULL)
454                         {
455                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
456                         goto err;
457                         }
458                 break;
459         default:
460                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
461                 goto err;
462                 }
463
464         /* We will be checking the signature */
465         if (md_sk != NULL)
466                 {
467                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
468                         {
469                         xa=sk_X509_ALGOR_value(md_sk,i);
470                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
471                                 {
472                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
473                                 goto err;
474                                 }
475
476                         j=OBJ_obj2nid(xa->algorithm);
477                         evp_md=EVP_get_digestbynid(j);
478                         if (evp_md == NULL)
479                                 {
480                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
481                                 goto err;
482                                 }
483
484                         BIO_set_md(btmp,evp_md);
485                         if (out == NULL)
486                                 out=btmp;
487                         else
488                                 BIO_push(out,btmp);
489                         btmp=NULL;
490                         }
491                 }
492
493         if (evp_cipher != NULL)
494                 {
495 #if 0
496                 unsigned char key[EVP_MAX_KEY_LENGTH];
497                 unsigned char iv[EVP_MAX_IV_LENGTH];
498                 unsigned char *p;
499                 int keylen,ivlen;
500                 int max;
501                 X509_OBJECT ret;
502 #endif
503                 unsigned char *ek = NULL;
504                 int eklen;
505
506                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
507                         {
508                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
509                         goto err;
510                         }
511
512                 /* It was encrypted, we need to decrypt the secret key
513                  * with the private key */
514
515                 /* Find the recipientInfo which matches the passed certificate
516                  * (if any)
517                  */
518
519                 if (pcert)
520                         {
521                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
522                                 {
523                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
524                                 if (!pkcs7_cmp_ri(ri, pcert))
525                                         break;
526                                 ri=NULL;
527                                 }
528                         if (ri == NULL)
529                                 {
530                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
531                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
532                                 goto err;
533                                 }
534                         }
535
536                 /* If we haven't got a certificate try each ri in turn */
537
538                 if (pcert == NULL)
539                         {
540                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
541                                 {
542                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
543                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
544                                                         ri, pkey) > 0)
545                                         break;
546                                 ERR_clear_error();
547                                 ri = NULL;
548                                 }
549                         if (ri == NULL)
550                                 {
551                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
552                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
553                                 goto err;
554                                 }
555                         }
556                 else
557                         {
558                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) <= 0)
559                                 goto err;
560                         }
561
562                 evp_ctx=NULL;
563                 BIO_get_cipher_ctx(etmp,&evp_ctx);
564                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
565                         goto err;
566                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
567                         goto err;
568
569                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
570                         /* Some S/MIME clients don't use the same key
571                          * and effective key length. The key length is
572                          * determined by the size of the decrypted RSA key.
573                          */
574                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
575                                 {
576                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
577                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
578                                 goto err;
579                                 }
580                 } 
581                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
582                         goto err;
583
584                 if (ek)
585                         {
586                         OPENSSL_cleanse(ek,eklen);
587                         OPENSSL_free(ek);
588                         }
589
590                 if (out == NULL)
591                         out=etmp;
592                 else
593                         BIO_push(out,etmp);
594                 etmp=NULL;
595                 }
596
597 #if 1
598         if (PKCS7_is_detached(p7) || (in_bio != NULL))
599                 {
600                 bio=in_bio;
601                 }
602         else 
603                 {
604 #if 0
605                 bio=BIO_new(BIO_s_mem());
606                 /* We need to set this so that when we have read all
607                  * the data, the encrypt BIO, if present, will read
608                  * EOF and encode the last few bytes */
609                 BIO_set_mem_eof_return(bio,0);
610
611                 if (data_body->length > 0)
612                         BIO_write(bio,(char *)data_body->data,data_body->length);
613 #else
614                 if (data_body->length > 0)
615                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
616                 else {
617                         bio=BIO_new(BIO_s_mem());
618                         BIO_set_mem_eof_return(bio,0);
619                 }
620                 if (bio == NULL)
621                         goto err;
622 #endif
623                 }
624         BIO_push(out,bio);
625         bio=NULL;
626 #endif
627         if (0)
628                 {
629 err:
630                 if (out != NULL) BIO_free_all(out);
631                 if (btmp != NULL) BIO_free_all(btmp);
632                 if (etmp != NULL) BIO_free_all(etmp);
633                 if (bio != NULL) BIO_free_all(bio);
634                 out=NULL;
635                 }
636         return(out);
637         }
638
639 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
640         {
641         for (;;)
642                 {
643                 bio=BIO_find_type(bio,BIO_TYPE_MD);
644                 if (bio == NULL)
645                         {
646                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
647                         return NULL;    
648                         }
649                 BIO_get_md_ctx(bio,pmd);
650                 if (*pmd == NULL)
651                         {
652                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
653                         return NULL;
654                         }       
655                 if (EVP_MD_CTX_type(*pmd) == nid)
656                         return bio;
657                 bio=BIO_next(bio);
658                 }
659         return NULL;
660         }
661
662 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
663         {
664         unsigned char md_data[EVP_MAX_MD_SIZE];
665         unsigned int md_len;
666
667         /* Add signing time if not already present */
668         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
669                 {
670                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
671                         {
672                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
673                                         ERR_R_MALLOC_FAILURE);
674                         return 0;
675                         }
676                 }
677
678         /* Add digest */
679         if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
680                 {
681                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
682                 return 0;
683                 }
684         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
685                 {
686                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
687                 return 0;
688                 }
689
690         /* Now sign the attributes */
691         if (!PKCS7_SIGNER_INFO_sign(si))
692                         return 0;
693
694         return 1;
695         }
696         
697                                 
698 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
699         {
700         int ret=0;
701         int i,j;
702         BIO *btmp;
703         PKCS7_SIGNER_INFO *si;
704         EVP_MD_CTX *mdc,ctx_tmp;
705         STACK_OF(X509_ATTRIBUTE) *sk;
706         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
707         ASN1_OCTET_STRING *os=NULL;
708
709         EVP_MD_CTX_init(&ctx_tmp);
710         i=OBJ_obj2nid(p7->type);
711         p7->state=PKCS7_S_HEADER;
712
713         switch (i)
714                 {
715         case NID_pkcs7_data:
716                 os = p7->d.data;
717                 break;
718         case NID_pkcs7_signedAndEnveloped:
719                 /* XXXXXXXXXXXXXXXX */
720                 si_sk=p7->d.signed_and_enveloped->signer_info;
721                 os = p7->d.signed_and_enveloped->enc_data->enc_data;
722                 if (!os)
723                         {
724                         os=M_ASN1_OCTET_STRING_new();
725                         if (!os)
726                                 {
727                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
728                                 goto err;
729                                 }
730                         p7->d.signed_and_enveloped->enc_data->enc_data=os;
731                         }
732                 break;
733         case NID_pkcs7_enveloped:
734                 /* XXXXXXXXXXXXXXXX */
735                 os = p7->d.enveloped->enc_data->enc_data;
736                 if (!os)
737                         {
738                         os=M_ASN1_OCTET_STRING_new();
739                         if (!os)
740                                 {
741                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
742                                 goto err;
743                                 }
744                         p7->d.enveloped->enc_data->enc_data=os;
745                         }
746                 break;
747         case NID_pkcs7_signed:
748                 si_sk=p7->d.sign->signer_info;
749                 os=PKCS7_get_octet_string(p7->d.sign->contents);
750                 /* If detached data then the content is excluded */
751                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
752                         M_ASN1_OCTET_STRING_free(os);
753                         p7->d.sign->contents->d.data = NULL;
754                 }
755                 break;
756
757         case NID_pkcs7_digest:
758                 os=PKCS7_get_octet_string(p7->d.digest->contents);
759                 /* If detached data then the content is excluded */
760                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
761                         {
762                         M_ASN1_OCTET_STRING_free(os);
763                         p7->d.digest->contents->d.data = NULL;
764                         }
765                 break;
766
767         default:
768                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
769                 goto err;
770                 }
771
772         if (si_sk != NULL)
773                 {
774                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
775                         {
776                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
777                         if (si->pkey == NULL)
778                                 continue;
779
780                         j = OBJ_obj2nid(si->digest_alg->algorithm);
781
782                         btmp=bio;
783
784                         btmp = PKCS7_find_digest(&mdc, btmp, j);
785
786                         if (btmp == NULL)
787                                 goto err;
788
789                         /* We now have the EVP_MD_CTX, lets do the
790                          * signing. */
791                         if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
792                                 goto err;
793
794                         sk=si->auth_attr;
795
796                         /* If there are attributes, we add the digest
797                          * attribute and only sign the attributes */
798                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
799                                 {
800                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
801                                         goto err;
802                                 }
803                         else
804                                 {
805                                 unsigned char *abuf = NULL;
806                                 unsigned int abuflen;
807                                 abuflen = EVP_PKEY_size(si->pkey);
808                                 abuf = OPENSSL_malloc(abuflen);
809                                 if (!abuf)
810                                         goto err;
811
812                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
813                                                         si->pkey))
814                                         {
815                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
816                                                         ERR_R_EVP_LIB);
817                                         goto err;
818                                         }
819                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
820                                 }
821                         }
822                 }
823         else if (i == NID_pkcs7_digest)
824                 {
825                 unsigned char md_data[EVP_MAX_MD_SIZE];
826                 unsigned int md_len;
827                 if (!PKCS7_find_digest(&mdc, bio,
828                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
829                         goto err;
830                 if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
831                         goto err;
832                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
833                 }
834
835         if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
836                 {
837                 char *cont;
838                 long contlen;
839                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
840                 if (btmp == NULL)
841                         {
842                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
843                         goto err;
844                         }
845                 contlen = BIO_get_mem_data(btmp, &cont);
846                 /* Mark the BIO read only then we can use its copy of the data
847                  * instead of making an extra copy.
848                  */
849                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
850                 BIO_set_mem_eof_return(btmp, 0);
851                 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
852                 }
853         ret=1;
854 err:
855         EVP_MD_CTX_cleanup(&ctx_tmp);
856         return(ret);
857         }
858
859 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
860         {
861         EVP_MD_CTX mctx;
862         EVP_PKEY_CTX *pctx;
863         unsigned char *abuf = NULL;
864         int alen;
865         size_t siglen;
866         const EVP_MD *md = NULL;
867
868         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
869         if (md == NULL)
870                 return 0;
871
872         EVP_MD_CTX_init(&mctx);
873         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
874                 goto err;
875
876         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
877                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
878                 {
879                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
880                 goto err;
881                 }
882
883         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
884                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
885         if(!abuf)
886                 goto err;
887         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
888                 goto err;
889         OPENSSL_free(abuf);
890         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
891                 goto err;
892         abuf = OPENSSL_malloc(siglen);
893         if(!abuf)
894                 goto err;
895         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
896                 goto err;
897
898         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
899                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
900                 {
901                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
902                 goto err;
903                 }
904
905         EVP_MD_CTX_cleanup(&mctx);
906
907         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
908
909         return 1;
910
911         err:
912         if (abuf)
913                 OPENSSL_free(abuf);
914         EVP_MD_CTX_cleanup(&mctx);
915         return 0;
916
917         }
918
919 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
920              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
921         {
922         PKCS7_ISSUER_AND_SERIAL *ias;
923         int ret=0,i;
924         STACK_OF(X509) *cert;
925         X509 *x509;
926
927         if (PKCS7_type_is_signed(p7))
928                 {
929                 cert=p7->d.sign->cert;
930                 }
931         else if (PKCS7_type_is_signedAndEnveloped(p7))
932                 {
933                 cert=p7->d.signed_and_enveloped->cert;
934                 }
935         else
936                 {
937                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
938                 goto err;
939                 }
940         /* XXXXXXXXXXXXXXXXXXXXXXX */
941         ias=si->issuer_and_serial;
942
943         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
944
945         /* were we able to find the cert in passed to us */
946         if (x509 == NULL)
947                 {
948                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
949                 goto err;
950                 }
951
952         /* Lets verify */
953         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
954                 {
955                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
956                 goto err;
957                 }
958         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
959         i=X509_verify_cert(ctx);
960         if (i <= 0) 
961                 {
962                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
963                 X509_STORE_CTX_cleanup(ctx);
964                 goto err;
965                 }
966         X509_STORE_CTX_cleanup(ctx);
967
968         return PKCS7_signatureVerify(bio, p7, si, x509);
969         err:
970         return ret;
971         }
972
973 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
974                                                                 X509 *x509)
975         {
976         ASN1_OCTET_STRING *os;
977         EVP_MD_CTX mdc_tmp,*mdc;
978         int ret=0,i;
979         int md_type;
980         STACK_OF(X509_ATTRIBUTE) *sk;
981         BIO *btmp;
982         EVP_PKEY *pkey;
983
984         EVP_MD_CTX_init(&mdc_tmp);
985
986         if (!PKCS7_type_is_signed(p7) && 
987                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
988                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
989                                                 PKCS7_R_WRONG_PKCS7_TYPE);
990                 goto err;
991         }
992
993         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
994
995         btmp=bio;
996         for (;;)
997                 {
998                 if ((btmp == NULL) ||
999                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
1000                         {
1001                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1002                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1003                         goto err;
1004                         }
1005                 BIO_get_md_ctx(btmp,&mdc);
1006                 if (mdc == NULL)
1007                         {
1008                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1009                                                         ERR_R_INTERNAL_ERROR);
1010                         goto err;
1011                         }
1012                 if (EVP_MD_CTX_type(mdc) == md_type)
1013                         break;
1014                 /* Workaround for some broken clients that put the signature
1015                  * OID instead of the digest OID in digest_alg->algorithm
1016                  */
1017                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1018                         break;
1019                 btmp=BIO_next(btmp);
1020                 }
1021
1022         /* mdc is the digest ctx that we want, unless there are attributes,
1023          * in which case the digest is the signed attributes */
1024         if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
1025                 goto err;
1026
1027         sk=si->auth_attr;
1028         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1029                 {
1030                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1031                 unsigned int md_len;
1032                 int alen;
1033                 ASN1_OCTET_STRING *message_digest;
1034
1035                 if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
1036                         goto err;
1037                 message_digest=PKCS7_digest_from_attributes(sk);
1038                 if (!message_digest)
1039                         {
1040                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1041                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1042                         goto err;
1043                         }
1044                 if ((message_digest->length != (int)md_len) ||
1045                         (memcmp(message_digest->data,md_dat,md_len)))
1046                         {
1047 #if 0
1048 {
1049 int ii;
1050 for (ii=0; ii<message_digest->length; ii++)
1051         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1052 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1053 }
1054 #endif
1055                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1056                                                         PKCS7_R_DIGEST_FAILURE);
1057                         ret= -1;
1058                         goto err;
1059                         }
1060
1061                 if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
1062                         goto err;
1063
1064                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1065                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1066                 if (alen <= 0) 
1067                         {
1068                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1069                         ret = -1;
1070                         goto err;
1071                         }
1072                 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1073                         goto err;
1074
1075                 OPENSSL_free(abuf);
1076                 }
1077
1078         os=si->enc_digest;
1079         pkey = X509_get_pubkey(x509);
1080         if (!pkey)
1081                 {
1082                 ret = -1;
1083                 goto err;
1084                 }
1085
1086         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1087         EVP_PKEY_free(pkey);
1088         if (i <= 0)
1089                 {
1090                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1091                                                 PKCS7_R_SIGNATURE_FAILURE);
1092                 ret= -1;
1093                 goto err;
1094                 }
1095         else
1096                 ret=1;
1097 err:
1098         EVP_MD_CTX_cleanup(&mdc_tmp);
1099         return(ret);
1100         }
1101
1102 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1103         {
1104         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1105         PKCS7_RECIP_INFO *ri;
1106         int i;
1107
1108         i=OBJ_obj2nid(p7->type);
1109         if (i != NID_pkcs7_signedAndEnveloped)
1110                 return NULL;
1111         if (p7->d.signed_and_enveloped == NULL)
1112                 return NULL;
1113         rsk=p7->d.signed_and_enveloped->recipientinfo;
1114         if (rsk == NULL)
1115                 return NULL;
1116         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1117         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1118         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1119         return(ri->issuer_and_serial);
1120         }
1121
1122 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1123         {
1124         return(get_attribute(si->auth_attr,nid));
1125         }
1126
1127 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1128         {
1129         return(get_attribute(si->unauth_attr,nid));
1130         }
1131
1132 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1133         {
1134         int i;
1135         X509_ATTRIBUTE *xa;
1136         ASN1_OBJECT *o;
1137
1138         o=OBJ_nid2obj(nid);
1139         if (!o || !sk) return(NULL);
1140         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1141                 {
1142                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1143                 if (OBJ_cmp(xa->object,o) == 0)
1144                         {
1145                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1146                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1147                         else
1148                                 return(NULL);
1149                         }
1150                 }
1151         return(NULL);
1152         }
1153
1154 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1155 {
1156         ASN1_TYPE *astype;
1157         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1158         return astype->value.octet_string;
1159 }
1160
1161 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1162                                 STACK_OF(X509_ATTRIBUTE) *sk)
1163         {
1164         int i;
1165
1166         if (p7si->auth_attr != NULL)
1167                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1168         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1169         if (p7si->auth_attr == NULL)
1170                 return 0;
1171         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1172                 {
1173                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1174                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1175                     == NULL)
1176                         return(0);
1177                 }
1178         return(1);
1179         }
1180
1181 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1182         {
1183         int i;
1184
1185         if (p7si->unauth_attr != NULL)
1186                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1187                                            X509_ATTRIBUTE_free);
1188         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1189         if (p7si->unauth_attr == NULL)
1190                 return 0;
1191         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1192                 {
1193                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1194                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1195                     == NULL)
1196                         return(0);
1197                 }
1198         return(1);
1199         }
1200
1201 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1202              void *value)
1203         {
1204         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1205         }
1206
1207 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1208              void *value)
1209         {
1210         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1211         }
1212
1213 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1214                          void *value)
1215         {
1216         X509_ATTRIBUTE *attr=NULL;
1217
1218         if (*sk == NULL)
1219                 {
1220                 *sk = sk_X509_ATTRIBUTE_new_null();
1221                 if (*sk == NULL)
1222                         return 0;       
1223 new_attrib:
1224                 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1225                         return 0;
1226                 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1227                         {
1228                         X509_ATTRIBUTE_free(attr);
1229                         return 0;
1230                         }
1231                 }
1232         else
1233                 {
1234                 int i;
1235
1236                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1237                         {
1238                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1239                         if (OBJ_obj2nid(attr->object) == nid)
1240                                 {
1241                                 X509_ATTRIBUTE_free(attr);
1242                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1243                                 if (attr == NULL)
1244                                         return 0;
1245                                 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1246                                         {
1247                                         X509_ATTRIBUTE_free(attr);
1248                                         return 0;
1249                                         }
1250                                 goto end;
1251                                 }
1252                         }
1253                 goto new_attrib;
1254                 }
1255 end:
1256         return(1);
1257         }
1258