pk7_lib.c revision 296341 
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        ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1);
189        if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1))
190            goto err;
191        p7->d.signed_and_enveloped->enc_data->content_type
192            = OBJ_nid2obj(NID_pkcs7_data);
193        break;
194    case NID_pkcs7_enveloped:
195        p7->type = obj;
196        if ((p7->d.enveloped = PKCS7_ENVELOPE_new())
197            == NULL)
198            goto err;
199        if (!ASN1_INTEGER_set(p7->d.enveloped->version, 0))
200            goto err;
201        p7->d.enveloped->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
202        break;
203    case NID_pkcs7_encrypted:
204        p7->type = obj;
205        if ((p7->d.encrypted = PKCS7_ENCRYPT_new())
206            == NULL)
207            goto err;
208        if (!ASN1_INTEGER_set(p7->d.encrypted->version, 0))
209            goto err;
210        p7->d.encrypted->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_data);
211        break;
212
213    case NID_pkcs7_digest:
214        p7->type = obj;
215        if ((p7->d.digest = PKCS7_DIGEST_new())
216            == NULL)
217            goto err;
218        if (!ASN1_INTEGER_set(p7->d.digest->version, 0))
219            goto err;
220        break;
221    default:
222        PKCS7err(PKCS7_F_PKCS7_SET_TYPE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
223        goto err;
224    }
225    return (1);
226 err:
227    return (0);
228}
229
230int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
231{
232    p7->type = OBJ_nid2obj(type);
233    p7->d.other = other;
234    return 1;
235}
236
237int PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
238{
239    int i, j, nid;
240    X509_ALGOR *alg;
241    STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
242    STACK_OF(X509_ALGOR) *md_sk;
243
244    i = OBJ_obj2nid(p7->type);
245    switch (i) {
246    case NID_pkcs7_signed:
247        signer_sk = p7->d.sign->signer_info;
248        md_sk = p7->d.sign->md_algs;
249        break;
250    case NID_pkcs7_signedAndEnveloped:
251        signer_sk = p7->d.signed_and_enveloped->signer_info;
252        md_sk = p7->d.signed_and_enveloped->md_algs;
253        break;
254    default:
255        PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, PKCS7_R_WRONG_CONTENT_TYPE);
256        return (0);
257    }
258
259    nid = OBJ_obj2nid(psi->digest_alg->algorithm);
260
261    /* If the digest is not currently listed, add it */
262    j = 0;
263    for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
264        alg = sk_X509_ALGOR_value(md_sk, i);
265        if (OBJ_obj2nid(alg->algorithm) == nid) {
266            j = 1;
267            break;
268        }
269    }
270    if (!j) {                   /* we need to add another algorithm */
271        if (!(alg = X509_ALGOR_new())
272            || !(alg->parameter = ASN1_TYPE_new())) {
273            X509_ALGOR_free(alg);
274            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
275            return (0);
276        }
277        alg->algorithm = OBJ_nid2obj(nid);
278        alg->parameter->type = V_ASN1_NULL;
279        if (!sk_X509_ALGOR_push(md_sk, alg)) {
280            X509_ALGOR_free(alg);
281            return 0;
282        }
283    }
284
285    if (!sk_PKCS7_SIGNER_INFO_push(signer_sk, psi))
286        return 0;
287    return (1);
288}
289
290int PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
291{
292    int i;
293    STACK_OF(X509) **sk;
294
295    i = OBJ_obj2nid(p7->type);
296    switch (i) {
297    case NID_pkcs7_signed:
298        sk = &(p7->d.sign->cert);
299        break;
300    case NID_pkcs7_signedAndEnveloped:
301        sk = &(p7->d.signed_and_enveloped->cert);
302        break;
303    default:
304        PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, PKCS7_R_WRONG_CONTENT_TYPE);
305        return (0);
306    }
307
308    if (*sk == NULL)
309        *sk = sk_X509_new_null();
310    if (*sk == NULL) {
311        PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);
312        return 0;
313    }
314    CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
315    if (!sk_X509_push(*sk, x509)) {
316        X509_free(x509);
317        return 0;
318    }
319    return (1);
320}
321
322int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
323{
324    int i;
325    STACK_OF(X509_CRL) **sk;
326
327    i = OBJ_obj2nid(p7->type);
328    switch (i) {
329    case NID_pkcs7_signed:
330        sk = &(p7->d.sign->crl);
331        break;
332    case NID_pkcs7_signedAndEnveloped:
333        sk = &(p7->d.signed_and_enveloped->crl);
334        break;
335    default:
336        PKCS7err(PKCS7_F_PKCS7_ADD_CRL, PKCS7_R_WRONG_CONTENT_TYPE);
337        return (0);
338    }
339
340    if (*sk == NULL)
341        *sk = sk_X509_CRL_new_null();
342    if (*sk == NULL) {
343        PKCS7err(PKCS7_F_PKCS7_ADD_CRL, ERR_R_MALLOC_FAILURE);
344        return 0;
345    }
346
347    CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
348    if (!sk_X509_CRL_push(*sk, crl)) {
349        X509_CRL_free(crl);
350        return 0;
351    }
352    return (1);
353}
354
355int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
356                          const EVP_MD *dgst)
357{
358    int ret;
359
360    /* We now need to add another PKCS7_SIGNER_INFO entry */
361    if (!ASN1_INTEGER_set(p7i->version, 1))
362        goto err;
363    if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
364                       X509_get_issuer_name(x509)))
365        goto err;
366
367    /*
368     * because ASN1_INTEGER_set is used to set a 'long' we will do things the
369     * ugly way.
370     */
371    M_ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
372    if (!(p7i->issuer_and_serial->serial =
373          M_ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
374        goto err;
375
376    /* lets keep the pkey around for a while */
377    CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
378    p7i->pkey = pkey;
379
380    /* Set the algorithms */
381
382    X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
383                    V_ASN1_NULL, NULL);
384
385    if (pkey->ameth && pkey->ameth->pkey_ctrl) {
386        ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN, 0, p7i);
387        if (ret > 0)
388            return 1;
389        if (ret != -2) {
390            PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
391                     PKCS7_R_SIGNING_CTRL_FAILURE);
392            return 0;
393        }
394    }
395    PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
396             PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
397 err:
398    return 0;
399}
400
401PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
402                                       const EVP_MD *dgst)
403{
404    PKCS7_SIGNER_INFO *si = NULL;
405
406    if (dgst == NULL) {
407        int def_nid;
408        if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
409            goto err;
410        dgst = EVP_get_digestbynid(def_nid);
411        if (dgst == NULL) {
412            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE, PKCS7_R_NO_DEFAULT_DIGEST);
413            goto err;
414        }
415    }
416
417    if ((si = PKCS7_SIGNER_INFO_new()) == NULL)
418        goto err;
419    if (!PKCS7_SIGNER_INFO_set(si, x509, pkey, dgst))
420        goto err;
421    if (!PKCS7_add_signer(p7, si))
422        goto err;
423    return (si);
424 err:
425    if (si)
426        PKCS7_SIGNER_INFO_free(si);
427    return (NULL);
428}
429
430int PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
431{
432    if (PKCS7_type_is_digest(p7)) {
433        if (!(p7->d.digest->md->parameter = ASN1_TYPE_new())) {
434            PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, ERR_R_MALLOC_FAILURE);
435            return 0;
436        }
437        p7->d.digest->md->parameter->type = V_ASN1_NULL;
438        p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
439        return 1;
440    }
441
442    PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, PKCS7_R_WRONG_CONTENT_TYPE);
443    return 1;
444}
445
446STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
447{
448    if (p7 == NULL || p7->d.ptr == NULL)
449        return NULL;
450    if (PKCS7_type_is_signed(p7)) {
451        return (p7->d.sign->signer_info);
452    } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
453        return (p7->d.signed_and_enveloped->signer_info);
454    } else
455        return (NULL);
456}
457
458void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
459                                 X509_ALGOR **pdig, X509_ALGOR **psig)
460{
461    if (pk)
462        *pk = si->pkey;
463    if (pdig)
464        *pdig = si->digest_alg;
465    if (psig)
466        *psig = si->digest_enc_alg;
467}
468
469void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
470{
471    if (penc)
472        *penc = ri->key_enc_algor;
473}
474
475PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
476{
477    PKCS7_RECIP_INFO *ri;
478
479    if ((ri = PKCS7_RECIP_INFO_new()) == NULL)
480        goto err;
481    if (!PKCS7_RECIP_INFO_set(ri, x509))
482        goto err;
483    if (!PKCS7_add_recipient_info(p7, ri))
484        goto err;
485    return ri;
486 err:
487    if (ri)
488        PKCS7_RECIP_INFO_free(ri);
489    return NULL;
490}
491
492int PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
493{
494    int i;
495    STACK_OF(PKCS7_RECIP_INFO) *sk;
496
497    i = OBJ_obj2nid(p7->type);
498    switch (i) {
499    case NID_pkcs7_signedAndEnveloped:
500        sk = p7->d.signed_and_enveloped->recipientinfo;
501        break;
502    case NID_pkcs7_enveloped:
503        sk = p7->d.enveloped->recipientinfo;
504        break;
505    default:
506        PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,
507                 PKCS7_R_WRONG_CONTENT_TYPE);
508        return (0);
509    }
510
511    if (!sk_PKCS7_RECIP_INFO_push(sk, ri))
512        return 0;
513    return (1);
514}
515
516int PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
517{
518    int ret;
519    EVP_PKEY *pkey = NULL;
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    pkey = X509_get_pubkey(x509);
532
533    if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl) {
534        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
535                 PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
536        goto err;
537    }
538
539    ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT, 0, p7i);
540    if (ret == -2) {
541        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
542                 PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
543        goto err;
544    }
545    if (ret <= 0) {
546        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,
547                 PKCS7_R_ENCRYPTION_CTRL_FAILURE);
548        goto err;
549    }
550
551    EVP_PKEY_free(pkey);
552
553    CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
554    p7i->cert = x509;
555
556    return 1;
557
558 err:
559    if (pkey)
560        EVP_PKEY_free(pkey);
561    return 0;
562}
563
564X509 *PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
565{
566    if (PKCS7_type_is_signed(p7))
567        return (X509_find_by_issuer_and_serial(p7->d.sign->cert,
568                                               si->issuer_and_serial->issuer,
569                                               si->
570                                               issuer_and_serial->serial));
571    else
572        return (NULL);
573}
574
575int PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
576{
577    int i;
578    PKCS7_ENC_CONTENT *ec;
579
580    i = OBJ_obj2nid(p7->type);
581    switch (i) {
582    case NID_pkcs7_signedAndEnveloped:
583        ec = p7->d.signed_and_enveloped->enc_data;
584        break;
585    case NID_pkcs7_enveloped:
586        ec = p7->d.enveloped->enc_data;
587        break;
588    default:
589        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER, PKCS7_R_WRONG_CONTENT_TYPE);
590        return (0);
591    }
592
593    /* Check cipher OID exists and has data in it */
594    i = EVP_CIPHER_type(cipher);
595    if (i == NID_undef) {
596        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,
597                 PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
598        return (0);
599    }
600
601    ec->cipher = cipher;
602    return 1;
603}
604
605int PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
606{
607    ASN1_OCTET_STRING *os = NULL;
608
609    switch (OBJ_obj2nid(p7->type)) {
610    case NID_pkcs7_data:
611        os = p7->d.data;
612        break;
613
614    case NID_pkcs7_signedAndEnveloped:
615        os = p7->d.signed_and_enveloped->enc_data->enc_data;
616        if (os == NULL) {
617            os = M_ASN1_OCTET_STRING_new();
618            p7->d.signed_and_enveloped->enc_data->enc_data = os;
619        }
620        break;
621
622    case NID_pkcs7_enveloped:
623        os = p7->d.enveloped->enc_data->enc_data;
624        if (os == NULL) {
625            os = M_ASN1_OCTET_STRING_new();
626            p7->d.enveloped->enc_data->enc_data = os;
627        }
628        break;
629
630    case NID_pkcs7_signed:
631        os = p7->d.sign->contents->d.data;
632        break;
633
634    default:
635        os = NULL;
636        break;
637    }
638
639    if (os == NULL)
640        return 0;
641
642    os->flags |= ASN1_STRING_FLAG_NDEF;
643    *boundary = &os->data;
644
645    return 1;
646}
647