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 
PKCS7_ctrl(PKCS7 * p7,int cmd,long larg,char * parg)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     /* NOTE(emilia): does not support detached digested data. */
73     case PKCS7_OP_SET_DETACHED_SIGNATURE:
74         if (nid == NID_pkcs7_signed) {
75             ret = p7->detached = (int)larg;
76             if (ret && PKCS7_type_is_data(p7->d.sign->contents)) {
77                 ASN1_OCTET_STRING *os;
78                 os = p7->d.sign->contents->d.data;
79                 ASN1_OCTET_STRING_free(os);
80                 p7->d.sign->contents->d.data = NULL;
81             }
82         } else {
83             PKCS7err(PKCS7_F_PKCS7_CTRL,
84                      PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
85             ret = 0;
86         }
87         break;
88     case PKCS7_OP_GET_DETACHED_SIGNATURE:
89         if (nid == NID_pkcs7_signed) {
90             if (!p7->d.sign || !p7->d.sign->contents->d.ptr)
91                 ret = 1;
92             else
93                 ret = 0;
94 
95             p7->detached = ret;
96         } else {
97             PKCS7err(PKCS7_F_PKCS7_CTRL,
98                      PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
99             ret = 0;
100         }
101 
102         break;
103     default:
104         PKCS7err(PKCS7_F_PKCS7_CTRL, PKCS7_R_UNKNOWN_OPERATION);
105         ret = 0;
106     }
107     return (ret);
108 }
109 
PKCS7_content_new(PKCS7 * p7,int type)110 int PKCS7_content_new(PKCS7 *p7, int type)
111 {
112     PKCS7 *ret = NULL;
113 
114     if ((ret = PKCS7_new()) == NULL)
115         goto err;
116     if (!PKCS7_set_type(ret, type))
117         goto err;
118     if (!PKCS7_set_content(p7, ret))
119         goto err;
120 
121     return (1);
122  err:
123     if (ret != NULL)
124         PKCS7_free(ret);
125     return (0);
126 }
127 
PKCS7_set_content(PKCS7 * p7,PKCS7 * p7_data)128 int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
129 {
130     int i;
131 
132     i = OBJ_obj2nid(p7->type);
133     switch (i) {
134     case NID_pkcs7_signed:
135         if (p7->d.sign->contents != NULL)
136             PKCS7_free(p7->d.sign->contents);
137         p7->d.sign->contents = p7_data;
138         break;
139     case NID_pkcs7_digest:
140         if (p7->d.digest->contents != NULL)
141             PKCS7_free(p7->d.digest->contents);
142         p7->d.digest->contents = p7_data;
143         break;
144     case NID_pkcs7_data:
145     case NID_pkcs7_enveloped:
146     case NID_pkcs7_signedAndEnveloped:
147     case NID_pkcs7_encrypted:
148     default:
149         PKCS7err(PKCS7_F_PKCS7_SET_CONTENT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
150         goto err;
151     }
152     return (1);
153  err:
154     return (0);
155 }
156 
PKCS7_set_type(PKCS7 * p7,int type)157 int PKCS7_set_type(PKCS7 *p7, int type)
158 {
159     ASN1_OBJECT *obj;
160 
161     /*
162      * PKCS7_content_free(p7);
163      */
164     obj = OBJ_nid2obj(type);    /* will not fail */
165 
166     switch (type) {
167     case NID_pkcs7_signed:
168         p7->type = obj;
169         if ((p7->d.sign = PKCS7_SIGNED_new()) == NULL)
170             goto err;
171         if (!ASN1_INTEGER_set(p7->d.sign->version, 1)) {
172             PKCS7_SIGNED_free(p7->d.sign);
173             p7->d.sign = NULL;
174             goto err;
175         }
176         break;
177     case NID_pkcs7_data:
178         p7->type = obj;
179         if ((p7->d.data = M_ASN1_OCTET_STRING_new()) == NULL)
180             goto err;
181         break;
182     case NID_pkcs7_signedAndEnveloped:
183         p7->type = obj;
184         if ((p7->d.signed_and_enveloped = PKCS7_SIGN_ENVELOPE_new())
185             == NULL)
186             goto err;
187         ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1);
188         if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1))
189             goto err;
190         p7->d.signed_and_enveloped->enc_data->content_type
191             = OBJ_nid2obj(NID_pkcs7_data);
192         break;
193     case NID_pkcs7_enveloped:
194         p7->type = obj;
195         if ((p7->d.enveloped = PKCS7_ENVELOPE_new())
196             == NULL)
197             goto err;
198         if (!ASN1_INTEGER_set(p7->d.enveloped->version, 0))
199             goto err;
200         p7->d.enveloped->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
201         break;
202     case NID_pkcs7_encrypted:
203         p7->type = obj;
204         if ((p7->d.encrypted = PKCS7_ENCRYPT_new())
205             == NULL)
206             goto err;
207         if (!ASN1_INTEGER_set(p7->d.encrypted->version, 0))
208             goto err;
209         p7->d.encrypted->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
210         break;
211 
212     case NID_pkcs7_digest:
213         p7->type = obj;
214         if ((p7->d.digest = PKCS7_DIGEST_new())
215             == NULL)
216             goto err;
217         if (!ASN1_INTEGER_set(p7->d.digest->version, 0))
218             goto err;
219         break;
220     default:
221         PKCS7err(PKCS7_F_PKCS7_SET_TYPE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
222         goto err;
223     }
224     return (1);
225  err:
226     return (0);
227 }
228 
PKCS7_set0_type_other(PKCS7 * p7,int type,ASN1_TYPE * other)229 int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
230 {
231     p7->type = OBJ_nid2obj(type);
232     p7->d.other = other;
233     return 1;
234 }
235 
PKCS7_add_signer(PKCS7 * p7,PKCS7_SIGNER_INFO * psi)236 int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
237 {
238     int i, j, nid;
239     X509_ALGOR *alg;
240     STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
241     STACK_OF(X509_ALGOR) *md_sk;
242 
243     i = OBJ_obj2nid(p7->type);
244     switch (i) {
245     case NID_pkcs7_signed:
246         signer_sk = p7->d.sign->signer_info;
247         md_sk = p7->d.sign->md_algs;
248         break;
249     case NID_pkcs7_signedAndEnveloped:
250         signer_sk = p7->d.signed_and_enveloped->signer_info;
251         md_sk = p7->d.signed_and_enveloped->md_algs;
252         break;
253     default:
254         PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, PKCS7_R_WRONG_CONTENT_TYPE);
255         return (0);
256     }
257 
258     nid = OBJ_obj2nid(psi->digest_alg->algorithm);
259 
260     /* If the digest is not currently listed, add it */
261     j = 0;
262     for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
263         alg = sk_X509_ALGOR_value(md_sk, i);
264         if (OBJ_obj2nid(alg->algorithm) == nid) {
265             j = 1;
266             break;
267         }
268     }
269     if (!j) {                   /* we need to add another algorithm */
270         if (!(alg = X509_ALGOR_new())
271             || !(alg->parameter = ASN1_TYPE_new())) {
272             X509_ALGOR_free(alg);
273             PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
274             return (0);
275         }
276         alg->algorithm = OBJ_nid2obj(nid);
277         alg->parameter->type = V_ASN1_NULL;
278         if (!sk_X509_ALGOR_push(md_sk, alg)) {
279             X509_ALGOR_free(alg);
280             return 0;
281         }
282     }
283 
284     if (!sk_PKCS7_SIGNER_INFO_push(signer_sk, psi))
285         return 0;
286     return (1);
287 }
288 
PKCS7_add_certificate(PKCS7 * p7,X509 * x509)289 int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
290 {
291     int i;
292     STACK_OF(X509) **sk;
293 
294     i = OBJ_obj2nid(p7->type);
295     switch (i) {
296     case NID_pkcs7_signed:
297         sk = &(p7->d.sign->cert);
298         break;
299     case NID_pkcs7_signedAndEnveloped:
300         sk = &(p7->d.signed_and_enveloped->cert);
301         break;
302     default:
303         PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, PKCS7_R_WRONG_CONTENT_TYPE);
304         return (0);
305     }
306 
307     if (*sk == NULL)
308         *sk = sk_X509_new_null();
309     if (*sk == NULL) {
310         PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);
311         return 0;
312     }
313     CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
314     if (!sk_X509_push(*sk, x509)) {
315         X509_free(x509);
316         return 0;
317     }
318     return (1);
319 }
320 
PKCS7_add_crl(PKCS7 * p7,X509_CRL * crl)321 int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
322 {
323     int i;
324     STACK_OF(X509_CRL) **sk;
325 
326     i = OBJ_obj2nid(p7->type);
327     switch (i) {
328     case NID_pkcs7_signed:
329         sk = &(p7->d.sign->crl);
330         break;
331     case NID_pkcs7_signedAndEnveloped:
332         sk = &(p7->d.signed_and_enveloped->crl);
333         break;
334     default:
335         PKCS7err(PKCS7_F_PKCS7_ADD_CRL, PKCS7_R_WRONG_CONTENT_TYPE);
336         return (0);
337     }
338 
339     if (*sk == NULL)
340         *sk = sk_X509_CRL_new_null();
341     if (*sk == NULL) {
342         PKCS7err(PKCS7_F_PKCS7_ADD_CRL, ERR_R_MALLOC_FAILURE);
343         return 0;
344     }
345 
346     CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
347     if (!sk_X509_CRL_push(*sk, crl)) {
348         X509_CRL_free(crl);
349         return 0;
350     }
351     return (1);
352 }
353 
PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO * p7i,X509 * x509,EVP_PKEY * pkey,const EVP_MD * dgst)354 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
355                           const EVP_MD *dgst)
356 {
357     int nid;
358     char is_dsa;
359 
360     if (pkey->type == EVP_PKEY_DSA || pkey->type == EVP_PKEY_EC)
361         is_dsa = 1;
362     else
363         is_dsa = 0;
364     /* We now need to add another PKCS7_SIGNER_INFO entry */
365     if (!ASN1_INTEGER_set(p7i->version, 1))
366         goto err;
367     if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
368                        X509_get_issuer_name(x509)))
369         goto err;
370 
371     /*
372      * because ASN1_INTEGER_set is used to set a 'long' we will do things the
373      * ugly way.
374      */
375     M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
376     if (!(p7i->issuer_and_serial->serial =
377           M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
378         goto err;
379 
380     /* lets keep the pkey around for a while */
381     CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
382     p7i->pkey = pkey;
383 
384     /* Set the algorithms */
385     if (is_dsa)
386         p7i->digest_alg->algorithm = OBJ_nid2obj(NID_sha1);
387     else
388         p7i->digest_alg->algorithm = OBJ_nid2obj(EVP_MD_type(dgst));
389 
390     if (p7i->digest_alg->parameter != NULL)
391         ASN1_TYPE_free(p7i->digest_alg->parameter);
392     if ((p7i->digest_alg->parameter = ASN1_TYPE_new()) == NULL)
393         goto err;
394     p7i->digest_alg->parameter->type = V_ASN1_NULL;
395 
396     if (p7i->digest_enc_alg->parameter != NULL)
397         ASN1_TYPE_free(p7i->digest_enc_alg->parameter);
398     nid = EVP_PKEY_type(pkey->type);
399     if (nid == EVP_PKEY_RSA) {
400         p7i->digest_enc_alg->algorithm = OBJ_nid2obj(NID_rsaEncryption);
401         if (!(p7i->digest_enc_alg->parameter = ASN1_TYPE_new()))
402             goto err;
403         p7i->digest_enc_alg->parameter->type = V_ASN1_NULL;
404     } else if (nid == EVP_PKEY_DSA) {
405 #if 1
406         /*
407          * use 'dsaEncryption' OID for compatibility with other software
408          * (PKCS #7 v1.5 does specify how to handle DSA) ...
409          */
410         p7i->digest_enc_alg->algorithm = OBJ_nid2obj(NID_dsa);
411 #else
412         /*
413          * ... although the 'dsaWithSHA1' OID (as required by RFC 2630 for
414          * CMS) would make more sense.
415          */
416         p7i->digest_enc_alg->algorithm = OBJ_nid2obj(NID_dsaWithSHA1);
417 #endif
418         p7i->digest_enc_alg->parameter = NULL; /* special case for DSA: omit
419                                                 * 'parameter'! */
420     } else if (nid == EVP_PKEY_EC) {
421         p7i->digest_enc_alg->algorithm = OBJ_nid2obj(NID_ecdsa_with_SHA1);
422         if (!(p7i->digest_enc_alg->parameter = ASN1_TYPE_new()))
423             goto err;
424         p7i->digest_enc_alg->parameter->type = V_ASN1_NULL;
425     } else
426         return (0);
427 
428     return (1);
429  err:
430     return (0);
431 }
432 
PKCS7_add_signature(PKCS7 * p7,X509 * x509,EVP_PKEY * pkey,const EVP_MD * dgst)433 PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
434                                        const EVP_MD *dgst)
435 {
436     PKCS7_SIGNER_INFO *si;
437 
438     if ((si = PKCS7_SIGNER_INFO_new()) == NULL)
439         goto err;
440     if (!PKCS7_SIGNER_INFO_set(si, x509, pkey, dgst))
441         goto err;
442     if (!PKCS7_add_signer(p7, si))
443         goto err;
444     return (si);
445  err:
446     PKCS7_SIGNER_INFO_free(si);
447     return (NULL);
448 }
449 
PKCS7_set_digest(PKCS7 * p7,const EVP_MD * md)450 int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
451 {
452     if (PKCS7_type_is_digest(p7)) {
453         if (!(p7->d.digest->md->parameter = ASN1_TYPE_new())) {
454             PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, ERR_R_MALLOC_FAILURE);
455             return 0;
456         }
457         p7->d.digest->md->parameter->type = V_ASN1_NULL;
458         p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
459         return 1;
460     }
461 
462     PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, PKCS7_R_WRONG_CONTENT_TYPE);
463     return 1;
464 }
465 
STACK_OF(PKCS7_SIGNER_INFO)466 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
467 {
468     if (p7 == NULL || p7->d.ptr == NULL)
469         return NULL;
470     if (PKCS7_type_is_signed(p7)) {
471         return (p7->d.sign->signer_info);
472     } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
473         return (p7->d.signed_and_enveloped->signer_info);
474     } else
475         return (NULL);
476 }
477 
PKCS7_add_recipient(PKCS7 * p7,X509 * x509)478 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
479 {
480     PKCS7_RECIP_INFO *ri;
481 
482     if ((ri = PKCS7_RECIP_INFO_new()) == NULL)
483         goto err;
484     if (!PKCS7_RECIP_INFO_set(ri, x509))
485         goto err;
486     if (!PKCS7_add_recipient_info(p7, ri))
487         goto err;
488     return (ri);
489  err:
490     PKCS7_RECIP_INFO_free(ri);
491     return (NULL);
492 }
493 
PKCS7_add_recipient_info(PKCS7 * p7,PKCS7_RECIP_INFO * ri)494 int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
495 {
496     int i;
497     STACK_OF(PKCS7_RECIP_INFO) *sk;
498 
499     i = OBJ_obj2nid(p7->type);
500     switch (i) {
501     case NID_pkcs7_signedAndEnveloped:
502         sk = p7->d.signed_and_enveloped->recipientinfo;
503         break;
504     case NID_pkcs7_enveloped:
505         sk = p7->d.enveloped->recipientinfo;
506         break;
507     default:
508         PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,
509                  PKCS7_R_WRONG_CONTENT_TYPE);
510         return (0);
511     }
512 
513     if (!sk_PKCS7_RECIP_INFO_push(sk, ri))
514         return 0;
515     return (1);
516 }
517 
PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO * p7i,X509 * x509)518 int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
519 {
520     if (!ASN1_INTEGER_set(p7i->version, 0))
521         return 0;
522     if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
523                        X509_get_issuer_name(x509)))
524         return 0;
525 
526     M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
527     if (!(p7i->issuer_and_serial->serial =
528           M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
529         return 0;
530 
531     X509_ALGOR_free(p7i->key_enc_algor);
532     if (!(p7i->key_enc_algor = X509_ALGOR_dup(x509->cert_info->key->algor)))
533         return 0;
534 
535     CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
536     p7i->cert = x509;
537 
538     return (1);
539 }
540 
PKCS7_cert_from_signer_info(PKCS7 * p7,PKCS7_SIGNER_INFO * si)541 X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
542 {
543     if (PKCS7_type_is_signed(p7))
544         return (X509_find_by_issuer_and_serial(p7->d.sign->cert,
545                                                si->issuer_and_serial->issuer,
546                                                si->
547                                                issuer_and_serial->serial));
548     else
549         return (NULL);
550 }
551 
PKCS7_set_cipher(PKCS7 * p7,const EVP_CIPHER * cipher)552 int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
553 {
554     int i;
555     PKCS7_ENC_CONTENT *ec;
556 
557     i = OBJ_obj2nid(p7->type);
558     switch (i) {
559     case NID_pkcs7_signedAndEnveloped:
560         ec = p7->d.signed_and_enveloped->enc_data;
561         break;
562     case NID_pkcs7_enveloped:
563         ec = p7->d.enveloped->enc_data;
564         break;
565     default:
566         PKCS7err(PKCS7_F_PKCS7_SET_CIPHER, PKCS7_R_WRONG_CONTENT_TYPE);
567         return (0);
568     }
569 
570     /* Check cipher OID exists and has data in it */
571     i = EVP_CIPHER_type(cipher);
572     if (i == NID_undef) {
573         PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,
574                  PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
575         return (0);
576     }
577 
578     ec->cipher = cipher;
579     return 1;
580 }
581