pk7_lib.c revision 340704 
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#include "asn1_locl.h"
64
65long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
66{
67    int nid;
68    long ret;
69
70    nid = OBJ_obj2nid(p7->type);
71
72    switch (cmd) {
73    /* NOTE(emilia): does not support detached digested data. */
74    case PKCS7_OP_SET_DETACHED_SIGNATURE:
75        if (nid == NID_pkcs7_signed) {
76            ret = p7->detached = (int)larg;
77            if (ret && PKCS7_type_is_data(p7->d.sign->contents)) {
78                ASN1_OCTET_STRING *os;
79                os = p7->d.sign->contents->d.data;
80                ASN1_OCTET_STRING_free(os);
81                p7->d.sign->contents->d.data = NULL;
82            }
83        } else {
84            PKCS7err(PKCS7_F_PKCS7_CTRL,
85                     PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
86            ret = 0;
87        }
88        break;
89    case PKCS7_OP_GET_DETACHED_SIGNATURE:
90        if (nid == NID_pkcs7_signed) {
91            if (!p7->d.sign || !p7->d.sign->contents->d.ptr)
92                ret = 1;
93            else
94                ret = 0;
95
96            p7->detached = ret;
97        } else {
98            PKCS7err(PKCS7_F_PKCS7_CTRL,
99                     PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
100            ret = 0;
101        }
102
103        break;
104    default:
105        PKCS7err(PKCS7_F_PKCS7_CTRL, PKCS7_R_UNKNOWN_OPERATION);
106        ret = 0;
107    }
108    return (ret);
109}
110
111int PKCS7_content_new(PKCS7 *p7, int type)
112{
113    PKCS7 *ret = NULL;
114
115    if ((ret = PKCS7_new()) == NULL)
116        goto err;
117    if (!PKCS7_set_type(ret, type))
118        goto err;
119    if (!PKCS7_set_content(p7, ret))
120        goto err;
121
122    return (1);
123 err:
124    if (ret != NULL)
125        PKCS7_free(ret);
126    return (0);
127}
128
129int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
130{
131    int i;
132
133    i = OBJ_obj2nid(p7->type);
134    switch (i) {
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
158int PKCS7_set_type(PKCS7 *p7, int type)
159{
160    ASN1_OBJECT *obj;
161
162    /*
163     * PKCS7_content_free(p7);
164     */
165    obj = OBJ_nid2obj(type);    /* will not fail */
166
167    switch (type) {
168    case NID_pkcs7_signed:
169        p7->type = obj;
170        if ((p7->d.sign = PKCS7_SIGNED_new()) == NULL)
171            goto err;
172        if (!ASN1_INTEGER_set(p7->d.sign->version, 1)) {
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)
187            goto err;
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
229int 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
236int 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
289int 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
321int 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
354int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
355                          const EVP_MD *dgst)
356{
357    int ret;
358
359    /* We now need to add another PKCS7_SIGNER_INFO entry */
360    if (!ASN1_INTEGER_set(p7i->version, 1))
361        goto err;
362    if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
363                       X509_get_issuer_name(x509)))
364        goto err;
365
366    /*
367     * because ASN1_INTEGER_set is used to set a 'long' we will do things the
368     * ugly way.
369     */
370    M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
371    if (!(p7i->issuer_and_serial->serial =
372          M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
373        goto err;
374
375    /* lets keep the pkey around for a while */
376    CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
377    p7i->pkey = pkey;
378
379    /* Set the algorithms */
380
381    X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
382                    V_ASN1_NULL, NULL);
383
384    if (pkey->ameth && pkey->ameth->pkey_ctrl) {
385        ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN, 0, p7i);
386        if (ret > 0)
387            return 1;
388        if (ret != -2) {
389            PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
390                     PKCS7_R_SIGNING_CTRL_FAILURE);
391            return 0;
392        }
393    }
394    PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
395             PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
396 err:
397    return 0;
398}
399
400PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
401                                       const EVP_MD *dgst)
402{
403    PKCS7_SIGNER_INFO *si = NULL;
404
405    if (dgst == NULL) {
406        int def_nid;
407        if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
408            goto err;
409        dgst = EVP_get_digestbynid(def_nid);
410        if (dgst == NULL) {
411            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE, PKCS7_R_NO_DEFAULT_DIGEST);
412            goto err;
413        }
414    }
415
416    if ((si = PKCS7_SIGNER_INFO_new()) == NULL)
417        goto err;
418    if (!PKCS7_SIGNER_INFO_set(si, x509, pkey, dgst))
419        goto err;
420    if (!PKCS7_add_signer(p7, si))
421        goto err;
422    return (si);
423 err:
424    if (si)
425        PKCS7_SIGNER_INFO_free(si);
426    return (NULL);
427}
428
429int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
430{
431    if (PKCS7_type_is_digest(p7)) {
432        if (!(p7->d.digest->md->parameter = ASN1_TYPE_new())) {
433            PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, ERR_R_MALLOC_FAILURE);
434            return 0;
435        }
436        p7->d.digest->md->parameter->type = V_ASN1_NULL;
437        p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
438        return 1;
439    }
440
441    PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, PKCS7_R_WRONG_CONTENT_TYPE);
442    return 1;
443}
444
445STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
446{
447    if (p7 == NULL || p7->d.ptr == NULL)
448        return NULL;
449    if (PKCS7_type_is_signed(p7)) {
450        return (p7->d.sign->signer_info);
451    } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
452        return (p7->d.signed_and_enveloped->signer_info);
453    } else
454        return (NULL);
455}
456
457void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
458                                 X509_ALGOR **pdig, X509_ALGOR **psig)
459{
460    if (pk)
461        *pk = si->pkey;
462    if (pdig)
463        *pdig = si->digest_alg;
464    if (psig)
465        *psig = si->digest_enc_alg;
466}
467
468void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
469{
470    if (penc)
471        *penc = ri->key_enc_algor;
472}
473
474PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
475{
476    PKCS7_RECIP_INFO *ri;
477
478    if ((ri = PKCS7_RECIP_INFO_new()) == NULL)
479        goto err;
480    if (!PKCS7_RECIP_INFO_set(ri, x509))
481        goto err;
482    if (!PKCS7_add_recipient_info(p7, ri))
483        goto err;
484    return ri;
485 err:
486    if (ri)
487        PKCS7_RECIP_INFO_free(ri);
488    return NULL;
489}
490
491int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
492{
493    int i;
494    STACK_OF(PKCS7_RECIP_INFO) *sk;
495
496    i = OBJ_obj2nid(p7->type);
497    switch (i) {
498    case NID_pkcs7_signedAndEnveloped:
499        sk = p7->d.signed_and_enveloped->recipientinfo;
500        break;
501    case NID_pkcs7_enveloped:
502        sk = p7->d.enveloped->recipientinfo;
503        break;
504    default:
505        PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,
506                 PKCS7_R_WRONG_CONTENT_TYPE);
507        return (0);
508    }
509
510    if (!sk_PKCS7_RECIP_INFO_push(sk, ri))
511        return 0;
512    return (1);
513}
514
515int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
516{
517    int ret;
518    EVP_PKEY *pkey = NULL;
519    if (!ASN1_INTEGER_set(p7i->version, 0))
520        return 0;
521    if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
522                       X509_get_issuer_name(x509)))
523        return 0;
524
525    M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
526    if (!(p7i->issuer_and_serial->serial =
527          M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
528        return 0;
529
530    pkey = X509_get_pubkey(x509);
531
532    if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl) {
533        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
534                 PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
535        goto err;
536    }
537
538    ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT, 0, p7i);
539    if (ret == -2) {
540        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
541                 PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
542        goto err;
543    }
544    if (ret <= 0) {
545        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
546                 PKCS7_R_ENCRYPTION_CTRL_FAILURE);
547        goto err;
548    }
549
550    EVP_PKEY_free(pkey);
551
552    CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
553    p7i->cert = x509;
554
555    return 1;
556
557 err:
558    if (pkey)
559        EVP_PKEY_free(pkey);
560    return 0;
561}
562
563X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
564{
565    if (PKCS7_type_is_signed(p7))
566        return (X509_find_by_issuer_and_serial(p7->d.sign->cert,
567                                               si->issuer_and_serial->issuer,
568                                               si->
569                                               issuer_and_serial->serial));
570    else
571        return (NULL);
572}
573
574int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
575{
576    int i;
577    PKCS7_ENC_CONTENT *ec;
578
579    i = OBJ_obj2nid(p7->type);
580    switch (i) {
581    case NID_pkcs7_signedAndEnveloped:
582        ec = p7->d.signed_and_enveloped->enc_data;
583        break;
584    case NID_pkcs7_enveloped:
585        ec = p7->d.enveloped->enc_data;
586        break;
587    default:
588        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER, PKCS7_R_WRONG_CONTENT_TYPE);
589        return (0);
590    }
591
592    /* Check cipher OID exists and has data in it */
593    i = EVP_CIPHER_type(cipher);
594    if (i == NID_undef) {
595        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,
596                 PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
597        return (0);
598    }
599
600    ec->cipher = cipher;
601    return 1;
602}
603
604int PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
605{
606    ASN1_OCTET_STRING *os = NULL;
607
608    switch (OBJ_obj2nid(p7->type)) {
609    case NID_pkcs7_data:
610        os = p7->d.data;
611        break;
612
613    case NID_pkcs7_signedAndEnveloped:
614        os = p7->d.signed_and_enveloped->enc_data->enc_data;
615        if (os == NULL) {
616            os = M_ASN1_OCTET_STRING_new();
617            p7->d.signed_and_enveloped->enc_data->enc_data = os;
618        }
619        break;
620
621    case NID_pkcs7_enveloped:
622        os = p7->d.enveloped->enc_data->enc_data;
623        if (os == NULL) {
624            os = M_ASN1_OCTET_STRING_new();
625            p7->d.enveloped->enc_data->enc_data = os;
626        }
627        break;
628
629    case NID_pkcs7_signed:
630        os = p7->d.sign->contents->d.data;
631        break;
632
633    default:
634        os = NULL;
635        break;
636    }
637
638    if (os == NULL)
639        return 0;
640
641    os->flags |= ASN1_STRING_FLAG_NDEF;
642    *boundary = &os->data;
643
644    return 1;
645}
646