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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 		{
73 	case PKCS7_OP_SET_DETACHED_SIGNATURE:
74 		if (nid == NID_pkcs7_signed)
75 			{
76 			ret=p7->detached=(int)larg;
77 			if (ret && PKCS7_type_is_data(p7->d.sign->contents))
78 					{
79 					ASN1_OCTET_STRING *os;
80 					os=p7->d.sign->contents->d.data;
81 					ASN1_OCTET_STRING_free(os);
82 					p7->d.sign->contents->d.data = NULL;
83 					}
84 			}
85 		else
86 			{
87 			PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
88 			ret=0;
89 			}
90 		break;
91 	case PKCS7_OP_GET_DETACHED_SIGNATURE:
92 		if (nid == NID_pkcs7_signed)
93 			{
94 			if(!p7->d.sign  || !p7->d.sign->contents->d.ptr)
95 				ret = 1;
96 			else ret = 0;
97 
98 			p7->detached = ret;
99 			}
100 		else
101 			{
102 			PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
103 			ret=0;
104 			}
105 
106 		break;
107 	default:
108 		PKCS7err(PKCS7_F_PKCS7_CTRL,PKCS7_R_UNKNOWN_OPERATION);
109 		ret=0;
110 		}
111 	return(ret);
112 	}
113 
PKCS7_content_new(PKCS7 * p7,int type)114 int PKCS7_content_new(PKCS7 *p7, int type)
115 	{
116 	PKCS7 *ret=NULL;
117 
118 	if ((ret=PKCS7_new()) == NULL) goto err;
119 	if (!PKCS7_set_type(ret,type)) goto err;
120 	if (!PKCS7_set_content(p7,ret)) goto err;
121 
122 	return(1);
123 err:
124 	if (ret != NULL) 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 		{
135 	case NID_pkcs7_signed:
136 		if (p7->d.sign->contents != NULL)
137 			PKCS7_free(p7->d.sign->contents);
138 		p7->d.sign->contents=p7_data;
139 		break;
140 	case NID_pkcs7_digest:
141 		if (p7->d.digest->contents != NULL)
142 			PKCS7_free(p7->d.digest->contents);
143 		p7->d.digest->contents=p7_data;
144 		break;
145 	case NID_pkcs7_data:
146 	case NID_pkcs7_enveloped:
147 	case NID_pkcs7_signedAndEnveloped:
148 	case NID_pkcs7_encrypted:
149 	default:
150 		PKCS7err(PKCS7_F_PKCS7_SET_CONTENT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
151 		goto err;
152 		}
153 	return(1);
154 err:
155 	return(0);
156 	}
157 
PKCS7_set_type(PKCS7 * p7,int type)158 int PKCS7_set_type(PKCS7 *p7, int type)
159 	{
160 	ASN1_OBJECT *obj;
161 
162 	/*PKCS7_content_free(p7);*/
163 	obj=OBJ_nid2obj(type); /* will not fail */
164 
165 	switch (type)
166 		{
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 			{
173 			PKCS7_SIGNED_free(p7->d.sign);
174 			p7->d.sign=NULL;
175 			goto err;
176 			}
177 		break;
178 	case NID_pkcs7_data:
179 		p7->type=obj;
180 		if ((p7->d.data=M_ASN1_OCTET_STRING_new()) == NULL)
181 			goto err;
182 		break;
183 	case NID_pkcs7_signedAndEnveloped:
184 		p7->type=obj;
185 		if ((p7->d.signed_and_enveloped=PKCS7_SIGN_ENVELOPE_new())
186 			== NULL) 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) goto err;
197 		if (!ASN1_INTEGER_set(p7->d.enveloped->version,0))
198 			goto err;
199 		p7->d.enveloped->enc_data->content_type
200 						= 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) goto err;
206 		if (!ASN1_INTEGER_set(p7->d.encrypted->version,0))
207 			goto err;
208 		p7->d.encrypted->enc_data->content_type
209 						= 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) goto err;
216 		if (!ASN1_INTEGER_set(p7->d.digest->version,0))
217 			goto err;
218 		break;
219 	default:
220 		PKCS7err(PKCS7_F_PKCS7_SET_TYPE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
221 		goto err;
222 		}
223 	return(1);
224 err:
225 	return(0);
226 	}
227 
PKCS7_set0_type_other(PKCS7 * p7,int type,ASN1_TYPE * other)228 int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
229 	{
230 	p7->type = OBJ_nid2obj(type);
231 	p7->d.other = other;
232 	return 1;
233 	}
234 
PKCS7_add_signer(PKCS7 * p7,PKCS7_SIGNER_INFO * psi)235 int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
236 	{
237 	int i,j,nid;
238 	X509_ALGOR *alg;
239 	STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
240 	STACK_OF(X509_ALGOR) *md_sk;
241 
242 	i=OBJ_obj2nid(p7->type);
243 	switch (i)
244 		{
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 		{
264 		alg=sk_X509_ALGOR_value(md_sk,i);
265 		if (OBJ_obj2nid(alg->algorithm) == nid)
266 			{
267 			j=1;
268 			break;
269 			}
270 		}
271 	if (!j) /* we need to add another algorithm */
272 		{
273 		if(!(alg=X509_ALGOR_new())
274 			|| !(alg->parameter = ASN1_TYPE_new()))
275 			{
276 			X509_ALGOR_free(alg);
277 			PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,ERR_R_MALLOC_FAILURE);
278 			return(0);
279 			}
280 		alg->algorithm=OBJ_nid2obj(nid);
281 		alg->parameter->type = V_ASN1_NULL;
282 		if (!sk_X509_ALGOR_push(md_sk,alg))
283 			{
284 			X509_ALGOR_free(alg);
285 			return 0;
286 			}
287 		}
288 
289 	if (!sk_PKCS7_SIGNER_INFO_push(signer_sk,psi))
290 		return 0;
291 	return(1);
292 	}
293 
PKCS7_add_certificate(PKCS7 * p7,X509 * x509)294 int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
295 	{
296 	int i;
297 	STACK_OF(X509) **sk;
298 
299 	i=OBJ_obj2nid(p7->type);
300 	switch (i)
301 		{
302 	case NID_pkcs7_signed:
303 		sk= &(p7->d.sign->cert);
304 		break;
305 	case NID_pkcs7_signedAndEnveloped:
306 		sk= &(p7->d.signed_and_enveloped->cert);
307 		break;
308 	default:
309 		PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE,PKCS7_R_WRONG_CONTENT_TYPE);
310 		return(0);
311 		}
312 
313 	if (*sk == NULL)
314 		*sk=sk_X509_new_null();
315 	if (*sk == NULL)
316 		{
317 		PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE,ERR_R_MALLOC_FAILURE);
318 		return 0;
319 		}
320 	CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
321 	if (!sk_X509_push(*sk,x509))
322 		{
323 		X509_free(x509);
324 		return 0;
325 		}
326 	return(1);
327 	}
328 
PKCS7_add_crl(PKCS7 * p7,X509_CRL * crl)329 int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
330 	{
331 	int i;
332 	STACK_OF(X509_CRL) **sk;
333 
334 	i=OBJ_obj2nid(p7->type);
335 	switch (i)
336 		{
337 	case NID_pkcs7_signed:
338 		sk= &(p7->d.sign->crl);
339 		break;
340 	case NID_pkcs7_signedAndEnveloped:
341 		sk= &(p7->d.signed_and_enveloped->crl);
342 		break;
343 	default:
344 		PKCS7err(PKCS7_F_PKCS7_ADD_CRL,PKCS7_R_WRONG_CONTENT_TYPE);
345 		return(0);
346 		}
347 
348 	if (*sk == NULL)
349 		*sk=sk_X509_CRL_new_null();
350 	if (*sk == NULL)
351 		{
352 		PKCS7err(PKCS7_F_PKCS7_ADD_CRL,ERR_R_MALLOC_FAILURE);
353 		return 0;
354 		}
355 
356 	CRYPTO_add(&crl->references,1,CRYPTO_LOCK_X509_CRL);
357 	if (!sk_X509_CRL_push(*sk,crl))
358 		{
359 		X509_CRL_free(crl);
360 		return 0;
361 		}
362 	return(1);
363 	}
364 
PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO * p7i,X509 * x509,EVP_PKEY * pkey,const EVP_MD * dgst)365 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
366 	     const EVP_MD *dgst)
367 	{
368 	int nid;
369 	char is_dsa;
370 
371 	if (pkey->type == EVP_PKEY_DSA || pkey->type == EVP_PKEY_EC)
372 		is_dsa = 1;
373 	else
374 		is_dsa = 0;
375 	/* We now need to add another PKCS7_SIGNER_INFO entry */
376 	if (!ASN1_INTEGER_set(p7i->version,1))
377 		goto err;
378 	if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
379 			X509_get_issuer_name(x509)))
380 		goto err;
381 
382 	/* because ASN1_INTEGER_set is used to set a 'long' we will do
383 	 * things the ugly way. */
384 	M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
385 	if (!(p7i->issuer_and_serial->serial=
386 			M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
387 		goto err;
388 
389 	/* lets keep the pkey around for a while */
390 	CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
391 	p7i->pkey=pkey;
392 
393 	/* Set the algorithms */
394 	if (is_dsa) p7i->digest_alg->algorithm=OBJ_nid2obj(NID_sha1);
395 	else
396 		p7i->digest_alg->algorithm=OBJ_nid2obj(EVP_MD_type(dgst));
397 
398 	if (p7i->digest_alg->parameter != NULL)
399 		ASN1_TYPE_free(p7i->digest_alg->parameter);
400 	if ((p7i->digest_alg->parameter=ASN1_TYPE_new()) == NULL)
401 		goto err;
402 	p7i->digest_alg->parameter->type=V_ASN1_NULL;
403 
404 	if (p7i->digest_enc_alg->parameter != NULL)
405 		ASN1_TYPE_free(p7i->digest_enc_alg->parameter);
406 	nid = EVP_PKEY_type(pkey->type);
407 	if (nid == EVP_PKEY_RSA)
408 		{
409 		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_rsaEncryption);
410 		if (!(p7i->digest_enc_alg->parameter=ASN1_TYPE_new()))
411 			goto err;
412 		p7i->digest_enc_alg->parameter->type=V_ASN1_NULL;
413 		}
414 	else if (nid == EVP_PKEY_DSA)
415 		{
416 #if 1
417 		/* use 'dsaEncryption' OID for compatibility with other software
418 		 * (PKCS #7 v1.5 does specify how to handle DSA) ... */
419 		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_dsa);
420 #else
421 		/* ... although the 'dsaWithSHA1' OID (as required by RFC 2630 for CMS)
422 		 * would make more sense. */
423 		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_dsaWithSHA1);
424 #endif
425 		p7i->digest_enc_alg->parameter = NULL; /* special case for DSA: omit 'parameter'! */
426 		}
427 	else if (nid == EVP_PKEY_EC)
428 		{
429 		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_ecdsa_with_SHA1);
430 		if (!(p7i->digest_enc_alg->parameter=ASN1_TYPE_new()))
431 			goto err;
432 		p7i->digest_enc_alg->parameter->type=V_ASN1_NULL;
433 		}
434 	else
435 		return(0);
436 
437 	return(1);
438 err:
439 	return(0);
440 	}
441 
PKCS7_add_signature(PKCS7 * p7,X509 * x509,EVP_PKEY * pkey,const EVP_MD * dgst)442 PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
443 	     const EVP_MD *dgst)
444 	{
445 	PKCS7_SIGNER_INFO *si;
446 
447 	if ((si=PKCS7_SIGNER_INFO_new()) == NULL) goto err;
448 	if (!PKCS7_SIGNER_INFO_set(si,x509,pkey,dgst)) goto err;
449 	if (!PKCS7_add_signer(p7,si)) goto err;
450 	return(si);
451 err:
452 	PKCS7_SIGNER_INFO_free(si);
453 	return(NULL);
454 	}
455 
PKCS7_set_digest(PKCS7 * p7,const EVP_MD * md)456 int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
457 	{
458 	if (PKCS7_type_is_digest(p7))
459 		{
460 		if(!(p7->d.digest->md->parameter = ASN1_TYPE_new()))
461 			{
462 			PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,ERR_R_MALLOC_FAILURE);
463 			return 0;
464 			}
465 		p7->d.digest->md->parameter->type = V_ASN1_NULL;
466 		p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
467 		return 1;
468 		}
469 
470 	PKCS7err(PKCS7_F_PKCS7_SET_DIGEST,PKCS7_R_WRONG_CONTENT_TYPE);
471 	return 1;
472 	}
473 
STACK_OF(PKCS7_SIGNER_INFO)474 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
475 	{
476 	if (PKCS7_type_is_signed(p7))
477 		{
478 		return(p7->d.sign->signer_info);
479 		}
480 	else if (PKCS7_type_is_signedAndEnveloped(p7))
481 		{
482 		return(p7->d.signed_and_enveloped->signer_info);
483 		}
484 	else
485 		return(NULL);
486 	}
487 
PKCS7_add_recipient(PKCS7 * p7,X509 * x509)488 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
489 	{
490 	PKCS7_RECIP_INFO *ri;
491 
492 	if ((ri=PKCS7_RECIP_INFO_new()) == NULL) goto err;
493 	if (!PKCS7_RECIP_INFO_set(ri,x509)) goto err;
494 	if (!PKCS7_add_recipient_info(p7,ri)) goto err;
495 	return(ri);
496 err:
497 	PKCS7_RECIP_INFO_free(ri);
498 	return(NULL);
499 	}
500 
PKCS7_add_recipient_info(PKCS7 * p7,PKCS7_RECIP_INFO * ri)501 int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
502 	{
503 	int i;
504 	STACK_OF(PKCS7_RECIP_INFO) *sk;
505 
506 	i=OBJ_obj2nid(p7->type);
507 	switch (i)
508 		{
509 	case NID_pkcs7_signedAndEnveloped:
510 		sk=	p7->d.signed_and_enveloped->recipientinfo;
511 		break;
512 	case NID_pkcs7_enveloped:
513 		sk=	p7->d.enveloped->recipientinfo;
514 		break;
515 	default:
516 		PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,PKCS7_R_WRONG_CONTENT_TYPE);
517 		return(0);
518 		}
519 
520 	if (!sk_PKCS7_RECIP_INFO_push(sk,ri))
521 		return 0;
522 	return(1);
523 	}
524 
PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO * p7i,X509 * x509)525 int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
526 	{
527 	if (!ASN1_INTEGER_set(p7i->version,0))
528 		return 0;
529 	if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
530 		X509_get_issuer_name(x509)))
531 		return 0;
532 
533 	M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
534 	if (!(p7i->issuer_and_serial->serial=
535 		M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
536 		return 0;
537 
538 	X509_ALGOR_free(p7i->key_enc_algor);
539 	if (!(p7i->key_enc_algor= X509_ALGOR_dup(x509->cert_info->key->algor)))
540 		return 0;
541 
542 	CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
543 	p7i->cert=x509;
544 
545 	return(1);
546 	}
547 
PKCS7_cert_from_signer_info(PKCS7 * p7,PKCS7_SIGNER_INFO * si)548 X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
549 	{
550 	if (PKCS7_type_is_signed(p7))
551 		return(X509_find_by_issuer_and_serial(p7->d.sign->cert,
552 			si->issuer_and_serial->issuer,
553 			si->issuer_and_serial->serial));
554 	else
555 		return(NULL);
556 	}
557 
PKCS7_set_cipher(PKCS7 * p7,const EVP_CIPHER * cipher)558 int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
559 	{
560 	int i;
561 	ASN1_OBJECT *objtmp;
562 	PKCS7_ENC_CONTENT *ec;
563 
564 	i=OBJ_obj2nid(p7->type);
565 	switch (i)
566 		{
567 	case NID_pkcs7_signedAndEnveloped:
568 		ec=p7->d.signed_and_enveloped->enc_data;
569 		break;
570 	case NID_pkcs7_enveloped:
571 		ec=p7->d.enveloped->enc_data;
572 		break;
573 	default:
574 		PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_WRONG_CONTENT_TYPE);
575 		return(0);
576 		}
577 
578 	/* Check cipher OID exists and has data in it*/
579 	i = EVP_CIPHER_type(cipher);
580 	if(i == NID_undef) {
581 		PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
582 		return(0);
583 	}
584 	objtmp = OBJ_nid2obj(i);
585 
586 	ec->cipher = cipher;
587 	return 1;
588 	}
589 
590