Update "OAEP reconsidered" comment
[openssl.git] / crypto / pkcs7 / pk7_lib.c
1 /* crypto/pkcs7/pk7_lib.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/objects.h>
62 #include <openssl/x509.h>
63
64 long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
65         {
66         int nid;
67         long ret;
68
69         nid=OBJ_obj2nid(p7->type);
70
71         switch (cmd)
72                 {
73         case PKCS7_OP_SET_DETACHED_SIGNATURE:
74                 if (nid == NID_pkcs7_signed)
75                         {
76                         ret=p7->detached=(int)larg;
77                         }
78                 else
79                         {
80                         PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
81                         ret=0;
82                         }
83                 break;
84         case PKCS7_OP_GET_DETACHED_SIGNATURE:
85                 if (nid == NID_pkcs7_signed)
86                         {
87                         if(!p7->d.sign  || !p7->d.sign->contents->d.ptr)
88                                 ret = 1;
89                         else ret = 0;
90                                 
91                         p7->detached = ret;
92                         }
93                 else
94                         {
95                         PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
96                         ret=0;
97                         }
98                         
99                 break;
100         default:
101                 PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_UNKNOWN_OPERATION);
102                 ret=0;
103                 }
104         return(ret);
105         }
106
107 int PKCS7_content_new(PKCS7 *p7, int type)
108         {
109         PKCS7 *ret=NULL;
110
111         if ((ret=PKCS7_new()) == NULL) goto err;
112         if (!PKCS7_set_type(ret,type)) goto err;
113         if (!PKCS7_set_content(p7,ret)) goto err;
114
115         return(1);
116 err:
117         if (ret != NULL) PKCS7_free(ret);
118         return(0);
119         }
120
121 int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
122         {
123         int i;
124
125         i=OBJ_obj2nid(p7->type);
126         switch (i)
127                 {
128         case NID_pkcs7_signed:
129                 if (p7->d.sign->contents != NULL)
130                         PKCS7_free(p7->d.sign->contents);
131                 p7->d.sign->contents=p7_data;
132                 break;
133         case NID_pkcs7_digest:
134         case NID_pkcs7_data:
135         case NID_pkcs7_enveloped:
136         case NID_pkcs7_signedAndEnveloped:
137         case NID_pkcs7_encrypted:
138         default:
139                 PKCS7err(PKCS7_F_PKCS7_SET_CONTENT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
140                 goto err;
141                 }
142         return(1);
143 err:
144         return(0);
145         }
146
147 int PKCS7_set_type(PKCS7 *p7, int type)
148         {
149         ASN1_OBJECT *obj;
150
151         /*PKCS7_content_free(p7);*/
152         obj=OBJ_nid2obj(type); /* will not fail */
153
154         switch (type)
155                 {
156         case NID_pkcs7_signed:
157                 p7->type=obj;
158                 if ((p7->d.sign=PKCS7_SIGNED_new()) == NULL)
159                         goto err;
160                 ASN1_INTEGER_set(p7->d.sign->version,1);
161                 break;
162         case NID_pkcs7_data:
163                 p7->type=obj;
164                 if ((p7->d.data=M_ASN1_OCTET_STRING_new()) == NULL)
165                         goto err;
166                 break;
167         case NID_pkcs7_signedAndEnveloped:
168                 p7->type=obj;
169                 if ((p7->d.signed_and_enveloped=PKCS7_SIGN_ENVELOPE_new())
170                         == NULL) goto err;
171                 ASN1_INTEGER_set(p7->d.signed_and_enveloped->version,1);
172                 break;
173         case NID_pkcs7_enveloped:
174                 p7->type=obj;
175                 if ((p7->d.enveloped=PKCS7_ENVELOPE_new())
176                         == NULL) goto err;
177                 ASN1_INTEGER_set(p7->d.enveloped->version,0);
178                 break;
179         case NID_pkcs7_encrypted:
180                 p7->type=obj;
181                 if ((p7->d.encrypted=PKCS7_ENCRYPT_new())
182                         == NULL) goto err;
183                 ASN1_INTEGER_set(p7->d.encrypted->version,0);
184                 break;
185
186         case NID_pkcs7_digest:
187         default:
188                 PKCS7err(PKCS7_F_PKCS7_SET_TYPE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
189                 goto err;
190                 }
191         return(1);
192 err:
193         return(0);
194         }
195
196 int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
197         {
198         int i,j,nid;
199         X509_ALGOR *alg;
200         STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
201         STACK_OF(X509_ALGOR) *md_sk;
202
203         i=OBJ_obj2nid(p7->type);
204         switch (i)
205                 {
206         case NID_pkcs7_signed:
207                 signer_sk=      p7->d.sign->signer_info;
208                 md_sk=          p7->d.sign->md_algs;
209                 break;
210         case NID_pkcs7_signedAndEnveloped:
211                 signer_sk=      p7->d.signed_and_enveloped->signer_info;
212                 md_sk=          p7->d.signed_and_enveloped->md_algs;
213                 break;
214         default:
215                 PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,PKCS7_R_WRONG_CONTENT_TYPE);
216                 return(0);
217                 }
218
219         nid=OBJ_obj2nid(psi->digest_alg->algorithm);
220
221         /* If the digest is not currently listed, add it */
222         j=0;
223         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
224                 {
225                 alg=sk_X509_ALGOR_value(md_sk,i);
226                 if (OBJ_obj2nid(alg->algorithm) == nid)
227                         {
228                         j=1;
229                         break;
230                         }
231                 }
232         if (!j) /* we need to add another algorithm */
233                 {
234                 if(!(alg=X509_ALGOR_new())
235                         || !(alg->parameter = ASN1_TYPE_new())) {
236                         PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,ERR_R_MALLOC_FAILURE);
237                         return(0);
238                 }
239                 alg->algorithm=OBJ_nid2obj(nid);
240                 alg->parameter->type = V_ASN1_NULL;
241                 sk_X509_ALGOR_push(md_sk,alg);
242                 }
243
244         sk_PKCS7_SIGNER_INFO_push(signer_sk,psi);
245         return(1);
246         }
247
248 int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
249         {
250         int i;
251         STACK_OF(X509) **sk;
252
253         i=OBJ_obj2nid(p7->type);
254         switch (i)
255                 {
256         case NID_pkcs7_signed:
257                 sk= &(p7->d.sign->cert);
258                 break;
259         case NID_pkcs7_signedAndEnveloped:
260                 sk= &(p7->d.signed_and_enveloped->cert);
261                 break;
262         default:
263                 PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE,PKCS7_R_WRONG_CONTENT_TYPE);
264                 return(0);
265                 }
266
267         if (*sk == NULL)
268                 *sk=sk_X509_new_null();
269         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
270         sk_X509_push(*sk,x509);
271         return(1);
272         }
273
274 int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
275         {
276         int i;
277         STACK_OF(X509_CRL) **sk;
278
279         i=OBJ_obj2nid(p7->type);
280         switch (i)
281                 {
282         case NID_pkcs7_signed:
283                 sk= &(p7->d.sign->crl);
284                 break;
285         case NID_pkcs7_signedAndEnveloped:
286                 sk= &(p7->d.signed_and_enveloped->crl);
287                 break;
288         default:
289                 PKCS7err(PKCS7_F_PKCS7_ADD_CRL,PKCS7_R_WRONG_CONTENT_TYPE);
290                 return(0);
291                 }
292
293         if (*sk == NULL)
294                 *sk=sk_X509_CRL_new_null();
295
296         CRYPTO_add(&crl->references,1,CRYPTO_LOCK_X509_CRL);
297         sk_X509_CRL_push(*sk,crl);
298         return(1);
299         }
300
301 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
302              EVP_MD *dgst)
303         {
304         char is_dsa;
305         if (pkey->type == EVP_PKEY_DSA) is_dsa = 1;
306         else is_dsa = 0;
307         /* We now need to add another PKCS7_SIGNER_INFO entry */
308         ASN1_INTEGER_set(p7i->version,1);
309         X509_NAME_set(&p7i->issuer_and_serial->issuer,
310                 X509_get_issuer_name(x509));
311
312         /* because ASN1_INTEGER_set is used to set a 'long' we will do
313          * things the ugly way. */
314         M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
315         p7i->issuer_and_serial->serial=
316                 M_ASN1_INTEGER_dup(X509_get_serialNumber(x509));
317
318         /* lets keep the pkey around for a while */
319         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
320         p7i->pkey=pkey;
321
322         /* Set the algorithms */
323         if (is_dsa) p7i->digest_alg->algorithm=OBJ_nid2obj(NID_sha1);
324         else    
325                 p7i->digest_alg->algorithm=OBJ_nid2obj(EVP_MD_type(dgst));
326
327         if (p7i->digest_alg->parameter != NULL)
328                 ASN1_TYPE_free(p7i->digest_alg->parameter);
329         if ((p7i->digest_alg->parameter=ASN1_TYPE_new()) == NULL)
330                 goto err;
331         p7i->digest_alg->parameter->type=V_ASN1_NULL;
332
333         p7i->digest_enc_alg->algorithm=OBJ_nid2obj(EVP_PKEY_type(pkey->type));
334
335         if (p7i->digest_enc_alg->parameter != NULL)
336                 ASN1_TYPE_free(p7i->digest_enc_alg->parameter);
337         if(is_dsa) p7i->digest_enc_alg->parameter = NULL;
338         else {
339                 if (!(p7i->digest_enc_alg->parameter=ASN1_TYPE_new()))
340                         goto err;
341                 p7i->digest_enc_alg->parameter->type=V_ASN1_NULL;
342         }
343
344         return(1);
345 err:
346         return(0);
347         }
348
349 PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
350              EVP_MD *dgst)
351         {
352         PKCS7_SIGNER_INFO *si;
353
354         if ((si=PKCS7_SIGNER_INFO_new()) == NULL) goto err;
355         if (!PKCS7_SIGNER_INFO_set(si,x509,pkey,dgst)) goto err;
356         if (!PKCS7_add_signer(p7,si)) goto err;
357         return(si);
358 err:
359         return(NULL);
360         }
361
362 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
363         {
364         if (PKCS7_type_is_signed(p7))
365                 {
366                 return(p7->d.sign->signer_info);
367                 }
368         else if (PKCS7_type_is_signedAndEnveloped(p7))
369                 {
370                 return(p7->d.signed_and_enveloped->signer_info);
371                 }
372         else
373                 return(NULL);
374         }
375
376 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
377         {
378         PKCS7_RECIP_INFO *ri;
379
380         if ((ri=PKCS7_RECIP_INFO_new()) == NULL) goto err;
381         if (!PKCS7_RECIP_INFO_set(ri,x509)) goto err;
382         if (!PKCS7_add_recipient_info(p7,ri)) goto err;
383         return(ri);
384 err:
385         return(NULL);
386         }
387
388 int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
389         {
390         int i;
391         STACK_OF(PKCS7_RECIP_INFO) *sk;
392
393         i=OBJ_obj2nid(p7->type);
394         switch (i)
395                 {
396         case NID_pkcs7_signedAndEnveloped:
397                 sk=     p7->d.signed_and_enveloped->recipientinfo;
398                 break;
399         case NID_pkcs7_enveloped:
400                 sk=     p7->d.enveloped->recipientinfo;
401                 break;
402         default:
403                 PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,PKCS7_R_WRONG_CONTENT_TYPE);
404                 return(0);
405                 }
406
407         sk_PKCS7_RECIP_INFO_push(sk,ri);
408         return(1);
409         }
410
411 int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
412         {
413         ASN1_INTEGER_set(p7i->version,0);
414         X509_NAME_set(&p7i->issuer_and_serial->issuer,
415                 X509_get_issuer_name(x509));
416
417         M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
418         p7i->issuer_and_serial->serial=
419                 M_ASN1_INTEGER_dup(X509_get_serialNumber(x509));
420
421         X509_ALGOR_free(p7i->key_enc_algor);
422         p7i->key_enc_algor= X509_ALGOR_dup(x509->cert_info->key->algor);
423
424         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
425         p7i->cert=x509;
426
427         return(1);
428         }
429
430 X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
431         {
432         if (PKCS7_type_is_signed(p7))
433                 return(X509_find_by_issuer_and_serial(p7->d.sign->cert,
434                         si->issuer_and_serial->issuer,
435                         si->issuer_and_serial->serial));
436         else
437                 return(NULL);
438         }
439
440 int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
441         {
442         int i;
443         ASN1_OBJECT *objtmp;
444         PKCS7_ENC_CONTENT *ec;
445
446         i=OBJ_obj2nid(p7->type);
447         switch (i)
448                 {
449         case NID_pkcs7_signedAndEnveloped:
450                 ec=p7->d.signed_and_enveloped->enc_data;
451                 break;
452         case NID_pkcs7_enveloped:
453                 ec=p7->d.enveloped->enc_data;
454                 break;
455         default:
456                 PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_WRONG_CONTENT_TYPE);
457                 return(0);
458                 }
459
460         /* Check cipher OID exists and has data in it*/
461         i = EVP_CIPHER_type(cipher);
462         if(i == NID_undef) {
463                 PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
464                 return(0);
465         }
466         objtmp = OBJ_nid2obj(i);
467
468         ec->cipher = cipher;
469         return 1;
470         }
471