1 /* crypto/pkcs7/pk7_doit.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65 #include <openssl/err.h>
67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
71 static int PKCS7_type_is_other(PKCS7 *p7)
75 int nid = OBJ_obj2nid(p7->type);
79 case NID_pkcs7_signed:
80 case NID_pkcs7_enveloped:
81 case NID_pkcs7_signedAndEnveloped:
82 case NID_pkcs7_digest:
83 case NID_pkcs7_encrypted:
94 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
96 if (PKCS7_type_is_data(p7))
98 if (PKCS7_type_is_other(p7) && p7->d.other
99 && (p7->d.other->type == V_ASN1_OCTET_STRING))
100 return p7->d.other->value.octet_string;
104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
108 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
109 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
113 md = EVP_get_digestbyobj(alg->algorithm);
115 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
119 BIO_set_md(btmp, md);
122 else if (!BIO_push(*pbio, btmp)) {
123 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
136 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
137 unsigned char *key, int keylen)
139 EVP_PKEY_CTX *pctx = NULL;
140 EVP_PKEY *pkey = NULL;
141 unsigned char *ek = NULL;
145 pkey = X509_get_pubkey(ri->cert);
150 pctx = EVP_PKEY_CTX_new(pkey, NULL);
154 if (EVP_PKEY_encrypt_init(pctx) <= 0)
157 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
158 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
159 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
163 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
166 ek = OPENSSL_malloc(eklen);
169 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
173 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
176 ASN1_STRING_set0(ri->enc_key, ek, eklen);
183 EVP_PKEY_CTX_free(pctx);
189 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
190 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
192 EVP_PKEY_CTX *pctx = NULL;
193 unsigned char *ek = NULL;
198 pctx = EVP_PKEY_CTX_new(pkey, NULL);
202 if (EVP_PKEY_decrypt_init(pctx) <= 0)
205 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
206 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
207 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
211 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
212 ri->enc_key->data, ri->enc_key->length) <= 0)
215 ek = OPENSSL_malloc(eklen);
218 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
222 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
223 ri->enc_key->data, ri->enc_key->length) <= 0) {
225 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
231 OPENSSL_clear_free(*pek, *peklen);
236 EVP_PKEY_CTX_free(pctx);
243 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
246 BIO *out = NULL, *btmp = NULL;
247 X509_ALGOR *xa = NULL;
248 const EVP_CIPHER *evp_cipher = NULL;
249 STACK_OF(X509_ALGOR) *md_sk = NULL;
250 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
251 X509_ALGOR *xalg = NULL;
252 PKCS7_RECIP_INFO *ri = NULL;
253 ASN1_OCTET_STRING *os = NULL;
256 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
260 * The content field in the PKCS7 ContentInfo is optional, but that really
261 * only applies to inner content (precisely, detached signatures).
263 * When reading content, missing outer content is therefore treated as an
266 * When creating content, PKCS7_content_new() must be called before
267 * calling this method, so a NULL p7->d is always an error.
269 if (p7->d.ptr == NULL) {
270 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
274 i = OBJ_obj2nid(p7->type);
275 p7->state = PKCS7_S_HEADER;
278 case NID_pkcs7_signed:
279 md_sk = p7->d.sign->md_algs;
280 os = PKCS7_get_octet_string(p7->d.sign->contents);
282 case NID_pkcs7_signedAndEnveloped:
283 rsk = p7->d.signed_and_enveloped->recipientinfo;
284 md_sk = p7->d.signed_and_enveloped->md_algs;
285 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
286 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
287 if (evp_cipher == NULL) {
288 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
292 case NID_pkcs7_enveloped:
293 rsk = p7->d.enveloped->recipientinfo;
294 xalg = p7->d.enveloped->enc_data->algorithm;
295 evp_cipher = p7->d.enveloped->enc_data->cipher;
296 if (evp_cipher == NULL) {
297 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
301 case NID_pkcs7_digest:
302 xa = p7->d.digest->md;
303 os = PKCS7_get_octet_string(p7->d.digest->contents);
308 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
312 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
313 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
316 if (xa && !PKCS7_bio_add_digest(&out, xa))
319 if (evp_cipher != NULL) {
320 unsigned char key[EVP_MAX_KEY_LENGTH];
321 unsigned char iv[EVP_MAX_IV_LENGTH];
325 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
326 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
329 BIO_get_cipher_ctx(btmp, &ctx);
330 keylen = EVP_CIPHER_key_length(evp_cipher);
331 ivlen = EVP_CIPHER_iv_length(evp_cipher);
332 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
334 if (RAND_bytes(iv, ivlen) <= 0)
336 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
338 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
340 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
344 if (xalg->parameter == NULL) {
345 xalg->parameter = ASN1_TYPE_new();
346 if (xalg->parameter == NULL)
349 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
353 /* Lets do the pub key stuff :-) */
354 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
355 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
356 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
359 OPENSSL_cleanse(key, keylen);
369 if (PKCS7_is_detached(p7))
370 bio = BIO_new(BIO_s_null());
371 else if (os && os->length > 0)
372 bio = BIO_new_mem_buf(os->data, os->length);
374 bio = BIO_new(BIO_s_mem());
377 BIO_set_mem_eof_return(bio, 0);
392 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
395 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
396 X509_get_issuer_name(pcert));
399 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
400 ri->issuer_and_serial->serial);
404 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
407 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
409 ASN1_OCTET_STRING *data_body = NULL;
410 const EVP_MD *evp_md;
411 const EVP_CIPHER *evp_cipher = NULL;
412 EVP_CIPHER_CTX *evp_ctx = NULL;
413 X509_ALGOR *enc_alg = NULL;
414 STACK_OF(X509_ALGOR) *md_sk = NULL;
415 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
416 PKCS7_RECIP_INFO *ri = NULL;
417 unsigned char *ek = NULL, *tkey = NULL;
418 int eklen = 0, tkeylen = 0;
421 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
425 if (p7->d.ptr == NULL) {
426 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
430 i = OBJ_obj2nid(p7->type);
431 p7->state = PKCS7_S_HEADER;
434 case NID_pkcs7_signed:
436 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
437 * field and optional content.
438 * data_body is NULL if that structure has no (=detached) content
439 * or if the contentType is wrong (i.e., not "data").
441 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
442 if (!PKCS7_is_detached(p7) && data_body == NULL) {
443 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
444 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
447 md_sk = p7->d.sign->md_algs;
449 case NID_pkcs7_signedAndEnveloped:
450 rsk = p7->d.signed_and_enveloped->recipientinfo;
451 md_sk = p7->d.signed_and_enveloped->md_algs;
452 /* data_body is NULL if the optional EncryptedContent is missing. */
453 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
454 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
455 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
456 if (evp_cipher == NULL) {
457 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
458 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
462 case NID_pkcs7_enveloped:
463 rsk = p7->d.enveloped->recipientinfo;
464 enc_alg = p7->d.enveloped->enc_data->algorithm;
465 /* data_body is NULL if the optional EncryptedContent is missing. */
466 data_body = p7->d.enveloped->enc_data->enc_data;
467 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
468 if (evp_cipher == NULL) {
469 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
470 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
475 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
479 /* Detached content must be supplied via in_bio instead. */
480 if (data_body == NULL && in_bio == NULL) {
481 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
485 /* We will be checking the signature */
487 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
488 xa = sk_X509_ALGOR_value(md_sk, i);
489 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
490 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
494 j = OBJ_obj2nid(xa->algorithm);
495 evp_md = EVP_get_digestbynid(j);
496 if (evp_md == NULL) {
497 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
498 PKCS7_R_UNKNOWN_DIGEST_TYPE);
502 BIO_set_md(btmp, evp_md);
511 if (evp_cipher != NULL) {
512 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
513 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
518 * It was encrypted, we need to decrypt the secret key with the
523 * Find the recipientInfo which matches the passed certificate (if
528 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
529 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
530 if (!pkcs7_cmp_ri(ri, pcert))
535 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
536 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
541 /* If we haven't got a certificate try each ri in turn */
544 * Always attempt to decrypt all rinfo even after success as a
545 * defence against MMA timing attacks.
547 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
548 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
550 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
555 /* Only exit on fatal errors, not decrypt failure */
556 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
562 BIO_get_cipher_ctx(etmp, &evp_ctx);
563 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
565 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
567 /* Generate random key as MMA defence */
568 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
569 tkey = OPENSSL_malloc(tkeylen);
572 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
580 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
582 * Some S/MIME clients don't use the same key and effective key
583 * length. The key length is determined by the size of the
586 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
587 /* Use random key as MMA defence */
588 OPENSSL_clear_free(ek, eklen);
594 /* Clear errors so we don't leak information useful in MMA */
596 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
599 OPENSSL_clear_free(ek, eklen);
601 OPENSSL_clear_free(tkey, tkeylen);
610 if (in_bio != NULL) {
613 if (data_body->length > 0)
614 bio = BIO_new_mem_buf(data_body->data, data_body->length);
616 bio = BIO_new(BIO_s_mem());
619 BIO_set_mem_eof_return(bio, 0);
629 OPENSSL_clear_free(ek, eklen);
630 OPENSSL_clear_free(tkey, tkeylen);
638 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
641 bio = BIO_find_type(bio, BIO_TYPE_MD);
643 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
644 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
647 BIO_get_md_ctx(bio, pmd);
649 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
652 if (EVP_MD_CTX_type(*pmd) == nid)
659 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
661 unsigned char md_data[EVP_MAX_MD_SIZE];
664 /* Add signing time if not already present */
665 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
666 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
667 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
673 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
674 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
677 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
678 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
682 /* Now sign the attributes */
683 if (!PKCS7_SIGNER_INFO_sign(si))
689 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
694 PKCS7_SIGNER_INFO *si;
695 EVP_MD_CTX *mdc, *ctx_tmp;
696 STACK_OF(X509_ATTRIBUTE) *sk;
697 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
698 ASN1_OCTET_STRING *os = NULL;
701 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
705 if (p7->d.ptr == NULL) {
706 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
710 ctx_tmp = EVP_MD_CTX_new();
711 if (ctx_tmp == NULL) {
712 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
716 i = OBJ_obj2nid(p7->type);
717 p7->state = PKCS7_S_HEADER;
723 case NID_pkcs7_signedAndEnveloped:
724 /* XXXXXXXXXXXXXXXX */
725 si_sk = p7->d.signed_and_enveloped->signer_info;
726 os = p7->d.signed_and_enveloped->enc_data->enc_data;
728 os = ASN1_OCTET_STRING_new();
730 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
733 p7->d.signed_and_enveloped->enc_data->enc_data = os;
736 case NID_pkcs7_enveloped:
737 /* XXXXXXXXXXXXXXXX */
738 os = p7->d.enveloped->enc_data->enc_data;
740 os = ASN1_OCTET_STRING_new();
742 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
745 p7->d.enveloped->enc_data->enc_data = os;
748 case NID_pkcs7_signed:
749 si_sk = p7->d.sign->signer_info;
750 os = PKCS7_get_octet_string(p7->d.sign->contents);
751 /* If detached data then the content is excluded */
752 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
753 ASN1_OCTET_STRING_free(os);
755 p7->d.sign->contents->d.data = NULL;
759 case NID_pkcs7_digest:
760 os = PKCS7_get_octet_string(p7->d.digest->contents);
761 /* If detached data then the content is excluded */
762 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
763 ASN1_OCTET_STRING_free(os);
765 p7->d.digest->contents->d.data = NULL;
770 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
775 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
776 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
777 if (si->pkey == NULL)
780 j = OBJ_obj2nid(si->digest_alg->algorithm);
784 btmp = PKCS7_find_digest(&mdc, btmp, j);
790 * We now have the EVP_MD_CTX, lets do the signing.
792 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
798 * If there are attributes, we add the digest attribute and only
799 * sign the attributes
801 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
802 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
805 unsigned char *abuf = NULL;
806 unsigned int abuflen;
807 abuflen = EVP_PKEY_size(si->pkey);
808 abuf = OPENSSL_malloc(abuflen);
812 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
813 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
816 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
819 } else if (i == NID_pkcs7_digest) {
820 unsigned char md_data[EVP_MAX_MD_SIZE];
822 if (!PKCS7_find_digest(&mdc, bio,
823 OBJ_obj2nid(p7->d.digest->md->algorithm)))
825 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
827 ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
830 if (!PKCS7_is_detached(p7)) {
832 * NOTE(emilia): I think we only reach os == NULL here because detached
833 * digested data support is broken.
837 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
840 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
842 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
845 contlen = BIO_get_mem_data(btmp, &cont);
847 * Mark the BIO read only then we can use its copy of the data
848 * instead of making an extra copy.
850 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
851 BIO_set_mem_eof_return(btmp, 0);
852 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
857 EVP_MD_CTX_free(ctx_tmp);
861 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
865 unsigned char *abuf = NULL;
868 const EVP_MD *md = NULL;
870 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
874 mctx = EVP_MD_CTX_new();
876 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
880 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
883 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
884 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
885 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
889 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
890 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
893 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
897 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
899 abuf = OPENSSL_malloc(siglen);
902 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
905 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
906 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
907 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
911 EVP_MD_CTX_free(mctx);
913 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
919 EVP_MD_CTX_free(mctx);
924 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
925 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
927 PKCS7_ISSUER_AND_SERIAL *ias;
929 STACK_OF(X509) *cert;
933 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
937 if (p7->d.ptr == NULL) {
938 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
942 if (PKCS7_type_is_signed(p7)) {
943 cert = p7->d.sign->cert;
944 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
945 cert = p7->d.signed_and_enveloped->cert;
947 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
950 /* XXXXXXXXXXXXXXXXXXXXXXX */
951 ias = si->issuer_and_serial;
953 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
955 /* were we able to find the cert in passed to us */
957 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
958 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
963 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
964 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
967 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
968 i = X509_verify_cert(ctx);
970 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
971 X509_STORE_CTX_cleanup(ctx);
974 X509_STORE_CTX_cleanup(ctx);
976 return PKCS7_signatureVerify(bio, p7, si, x509);
981 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
984 ASN1_OCTET_STRING *os;
985 EVP_MD_CTX *mdc_tmp, *mdc;
988 STACK_OF(X509_ATTRIBUTE) *sk;
992 mdc_tmp = EVP_MD_CTX_new();
993 if (mdc_tmp == NULL) {
994 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
998 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
999 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1003 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1007 if ((btmp == NULL) ||
1008 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1009 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1010 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1013 BIO_get_md_ctx(btmp, &mdc);
1015 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1018 if (EVP_MD_CTX_type(mdc) == md_type)
1021 * Workaround for some broken clients that put the signature OID
1022 * instead of the digest OID in digest_alg->algorithm
1024 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1026 btmp = BIO_next(btmp);
1030 * mdc is the digest ctx that we want, unless there are attributes, in
1031 * which case the digest is the signed attributes
1033 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1037 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1038 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1039 unsigned int md_len;
1041 ASN1_OCTET_STRING *message_digest;
1043 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1045 message_digest = PKCS7_digest_from_attributes(sk);
1046 if (!message_digest) {
1047 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1048 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1051 if ((message_digest->length != (int)md_len) ||
1052 (memcmp(message_digest->data, md_dat, md_len))) {
1053 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1058 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1061 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1062 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1064 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1068 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1074 os = si->enc_digest;
1075 pkey = X509_get_pubkey(x509);
1081 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1082 EVP_PKEY_free(pkey);
1084 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1090 EVP_MD_CTX_free(mdc_tmp);
1094 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1096 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1097 PKCS7_RECIP_INFO *ri;
1100 i = OBJ_obj2nid(p7->type);
1101 if (i != NID_pkcs7_signedAndEnveloped)
1103 if (p7->d.signed_and_enveloped == NULL)
1105 rsk = p7->d.signed_and_enveloped->recipientinfo;
1108 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1110 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1111 return (ri->issuer_and_serial);
1114 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1116 return (get_attribute(si->auth_attr, nid));
1119 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1121 return (get_attribute(si->unauth_attr, nid));
1124 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1128 idx = X509at_get_attr_by_NID(sk, nid, -1);
1129 xa = X509at_get_attr(sk, idx);
1130 return X509_ATTRIBUTE_get0_type(xa, 0);
1133 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1136 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1138 return astype->value.octet_string;
1141 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1142 STACK_OF(X509_ATTRIBUTE) *sk)
1146 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1147 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1148 if (p7si->auth_attr == NULL)
1150 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1151 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1152 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1160 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1161 STACK_OF(X509_ATTRIBUTE) *sk)
1165 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1166 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1167 if (p7si->unauth_attr == NULL)
1169 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1170 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1171 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1179 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1182 return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1185 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1188 return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1191 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1194 X509_ATTRIBUTE *attr = NULL;
1197 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1200 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1202 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1203 X509_ATTRIBUTE_free(attr);
1209 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1210 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1211 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1212 X509_ATTRIBUTE_free(attr);
1213 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1216 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1217 X509_ATTRIBUTE_free(attr);