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      1 /* pk7_smime.c */
      2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      3  * project.
      4  */
      5 /* ====================================================================
      6  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in
     17  *    the documentation and/or other materials provided with the
     18  *    distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this
     21  *    software must display the following acknowledgment:
     22  *    "This product includes software developed by the OpenSSL Project
     23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     24  *
     25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     26  *    endorse or promote products derived from this software without
     27  *    prior written permission. For written permission, please contact
     28  *    licensing (at) OpenSSL.org.
     29  *
     30  * 5. Products derived from this software may not be called "OpenSSL"
     31  *    nor may "OpenSSL" appear in their names without prior written
     32  *    permission of the OpenSSL Project.
     33  *
     34  * 6. Redistributions of any form whatsoever must retain the following
     35  *    acknowledgment:
     36  *    "This product includes software developed by the OpenSSL Project
     37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     38  *
     39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     50  * OF THE POSSIBILITY OF SUCH DAMAGE.
     51  * ====================================================================
     52  *
     53  * This product includes cryptographic software written by Eric Young
     54  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     55  * Hudson (tjh (at) cryptsoft.com).
     56  *
     57  */
     58 
     59 /* Simple PKCS#7 processing functions */
     60 
     61 #include <stdio.h>
     62 #include "cryptlib.h"
     63 #include <openssl/x509.h>
     64 #include <openssl/x509v3.h>
     65 
     66 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
     67 
     68 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
     69 		  BIO *data, int flags)
     70 {
     71 	PKCS7 *p7;
     72 	int i;
     73 
     74 	if(!(p7 = PKCS7_new()))
     75 		{
     76 		PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
     77 		return NULL;
     78 		}
     79 
     80 	if (!PKCS7_set_type(p7, NID_pkcs7_signed))
     81 		goto err;
     82 
     83 	if (!PKCS7_content_new(p7, NID_pkcs7_data))
     84 		goto err;
     85 
     86     	if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags))
     87 		{
     88 		PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
     89 		goto err;
     90 		}
     91 
     92 	if(!(flags & PKCS7_NOCERTS))
     93 		{
     94 		for(i = 0; i < sk_X509_num(certs); i++)
     95 			{
     96 			if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
     97 				goto err;
     98 			}
     99 		}
    100 
    101 	if(flags & PKCS7_DETACHED)
    102 		PKCS7_set_detached(p7, 1);
    103 
    104 	if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
    105 		return p7;
    106 
    107 	if (PKCS7_final(p7, data, flags))
    108 		return p7;
    109 
    110 	err:
    111 	PKCS7_free(p7);
    112 	return NULL;
    113 }
    114 
    115 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
    116 	{
    117 	BIO *p7bio;
    118 	int ret = 0;
    119 	if (!(p7bio = PKCS7_dataInit(p7, NULL)))
    120 		{
    121 		PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE);
    122 		return 0;
    123 		}
    124 
    125 	SMIME_crlf_copy(data, p7bio, flags);
    126 
    127 	(void)BIO_flush(p7bio);
    128 
    129 
    130         if (!PKCS7_dataFinal(p7,p7bio))
    131 		{
    132 		PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN);
    133 		goto err;
    134 		}
    135 
    136 	ret = 1;
    137 
    138 	err:
    139 	BIO_free_all(p7bio);
    140 
    141 	return ret;
    142 
    143 	}
    144 
    145 /* Check to see if a cipher exists and if so add S/MIME capabilities */
    146 
    147 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
    148 	{
    149 	if (EVP_get_cipherbynid(nid))
    150 		return PKCS7_simple_smimecap(sk, nid, arg);
    151 	return 1;
    152 	}
    153 
    154 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
    155 	{
    156 	if (EVP_get_digestbynid(nid))
    157 		return PKCS7_simple_smimecap(sk, nid, arg);
    158 	return 1;
    159 	}
    160 
    161 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
    162 					EVP_PKEY *pkey, const EVP_MD *md,
    163 					int flags)
    164 	{
    165 	PKCS7_SIGNER_INFO *si = NULL;
    166 	STACK_OF(X509_ALGOR) *smcap = NULL;
    167 	if(!X509_check_private_key(signcert, pkey))
    168 		{
    169 		PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
    170 			PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
    171                 return NULL;
    172 		}
    173 
    174     	if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
    175 		{
    176 		PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
    177 				PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
    178 		return NULL;
    179 		}
    180 
    181 	if(!(flags & PKCS7_NOCERTS))
    182 		{
    183 		if (!PKCS7_add_certificate(p7, signcert))
    184 			goto err;
    185 		}
    186 
    187 	if(!(flags & PKCS7_NOATTR))
    188 		{
    189 		if (!PKCS7_add_attrib_content_type(si, NULL))
    190 			goto err;
    191 		/* Add SMIMECapabilities */
    192 		if(!(flags & PKCS7_NOSMIMECAP))
    193 			{
    194 			if(!(smcap = sk_X509_ALGOR_new_null()))
    195 				{
    196 				PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
    197 					ERR_R_MALLOC_FAILURE);
    198 				goto err;
    199 				}
    200 			if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
    201 			|| !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
    202 			|| !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
    203 				|| !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
    204 				|| !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
    205 			|| !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
    206 				|| !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
    207 				|| !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
    208 				|| !add_cipher_smcap(smcap, NID_des_cbc, -1)
    209 				|| !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
    210 				|| !PKCS7_add_attrib_smimecap (si, smcap))
    211 				goto err;
    212 			sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
    213 			smcap = NULL;
    214 			}
    215 		if (flags & PKCS7_REUSE_DIGEST)
    216 			{
    217 			if (!pkcs7_copy_existing_digest(p7, si))
    218 				goto err;
    219 			if (!(flags & PKCS7_PARTIAL) &&
    220 					!PKCS7_SIGNER_INFO_sign(si))
    221 				goto err;
    222 			}
    223 		}
    224 	return si;
    225 	err:
    226 	if (smcap)
    227 		sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
    228 	return NULL;
    229 	}
    230 
    231 /* Search for a digest matching SignerInfo digest type and if found
    232  * copy across.
    233  */
    234 
    235 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
    236 	{
    237 	int i;
    238 	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    239 	PKCS7_SIGNER_INFO *sitmp;
    240 	ASN1_OCTET_STRING *osdig = NULL;
    241 	sinfos = PKCS7_get_signer_info(p7);
    242 	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
    243 		{
    244 		sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
    245 		if (si == sitmp)
    246 			break;
    247 		if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
    248 			continue;
    249 		if (!OBJ_cmp(si->digest_alg->algorithm,
    250 				sitmp->digest_alg->algorithm))
    251 			{
    252 			osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
    253 			break;
    254 			}
    255 
    256 		}
    257 
    258 	if (osdig)
    259 		return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
    260 
    261 	PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
    262 			PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
    263 	return 0;
    264 	}
    265 
    266 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
    267 					BIO *indata, BIO *out, int flags)
    268 {
    269 	STACK_OF(X509) *signers;
    270 	X509 *signer;
    271 	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    272 	PKCS7_SIGNER_INFO *si;
    273 	X509_STORE_CTX cert_ctx;
    274 	char buf[4096];
    275 	int i, j=0, k, ret = 0;
    276 	BIO *p7bio;
    277 	BIO *tmpin, *tmpout;
    278 
    279 	if(!p7) {
    280 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
    281 		return 0;
    282 	}
    283 
    284 	if(!PKCS7_type_is_signed(p7)) {
    285 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
    286 		return 0;
    287 	}
    288 
    289 	/* Check for no data and no content: no data to verify signature */
    290 	if(PKCS7_get_detached(p7) && !indata) {
    291 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
    292 		return 0;
    293 	}
    294 #if 0
    295 	/* NB: this test commented out because some versions of Netscape
    296 	 * illegally include zero length content when signing data.
    297 	 */
    298 
    299 	/* Check for data and content: two sets of data */
    300 	if(!PKCS7_get_detached(p7) && indata) {
    301 				PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
    302 		return 0;
    303 	}
    304 #endif
    305 
    306 	sinfos = PKCS7_get_signer_info(p7);
    307 
    308 	if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
    309 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
    310 		return 0;
    311 	}
    312 
    313 
    314 	signers = PKCS7_get0_signers(p7, certs, flags);
    315 
    316 	if(!signers) return 0;
    317 
    318 	/* Now verify the certificates */
    319 
    320 	if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
    321 		signer = sk_X509_value (signers, k);
    322 		if (!(flags & PKCS7_NOCHAIN)) {
    323 			if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
    324 							p7->d.sign->cert))
    325 				{
    326 				PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
    327 				sk_X509_free(signers);
    328 				return 0;
    329 				}
    330 			X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
    331 		} else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
    332 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
    333 			sk_X509_free(signers);
    334 			return 0;
    335 		}
    336 		if (!(flags & PKCS7_NOCRL))
    337 			X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
    338 		i = X509_verify_cert(&cert_ctx);
    339 		if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
    340 		X509_STORE_CTX_cleanup(&cert_ctx);
    341 		if (i <= 0) {
    342 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
    343 			ERR_add_error_data(2, "Verify error:",
    344 					 X509_verify_cert_error_string(j));
    345 			sk_X509_free(signers);
    346 			return 0;
    347 		}
    348 		/* Check for revocation status here */
    349 	}
    350 
    351 	/* Performance optimization: if the content is a memory BIO then
    352 	 * store its contents in a temporary read only memory BIO. This
    353 	 * avoids potentially large numbers of slow copies of data which will
    354 	 * occur when reading from a read write memory BIO when signatures
    355 	 * are calculated.
    356 	 */
    357 
    358 	if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
    359 		{
    360 		char *ptr;
    361 		long len;
    362 		len = BIO_get_mem_data(indata, &ptr);
    363 		tmpin = BIO_new_mem_buf(ptr, len);
    364 		if (tmpin == NULL)
    365 			{
    366 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
    367 			return 0;
    368 			}
    369 		}
    370 	else
    371 		tmpin = indata;
    372 
    373 
    374 	if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
    375 		goto err;
    376 
    377 	if(flags & PKCS7_TEXT) {
    378 		if(!(tmpout = BIO_new(BIO_s_mem()))) {
    379 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
    380 			goto err;
    381 		}
    382 		BIO_set_mem_eof_return(tmpout, 0);
    383 	} else tmpout = out;
    384 
    385 	/* We now have to 'read' from p7bio to calculate digests etc. */
    386 	for (;;)
    387 	{
    388 		i=BIO_read(p7bio,buf,sizeof(buf));
    389 		if (i <= 0) break;
    390 		if (tmpout) BIO_write(tmpout, buf, i);
    391 	}
    392 
    393 	if(flags & PKCS7_TEXT) {
    394 		if(!SMIME_text(tmpout, out)) {
    395 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
    396 			BIO_free(tmpout);
    397 			goto err;
    398 		}
    399 		BIO_free(tmpout);
    400 	}
    401 
    402 	/* Now Verify All Signatures */
    403 	if (!(flags & PKCS7_NOSIGS))
    404 	    for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
    405 		{
    406 		si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
    407 		signer = sk_X509_value (signers, i);
    408 		j=PKCS7_signatureVerify(p7bio,p7,si, signer);
    409 		if (j <= 0) {
    410 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
    411 			goto err;
    412 		}
    413 	}
    414 
    415 	ret = 1;
    416 
    417 	err:
    418 
    419 	if (tmpin == indata)
    420 		{
    421 		if (indata) BIO_pop(p7bio);
    422 		}
    423 	BIO_free_all(p7bio);
    424 
    425 	sk_X509_free(signers);
    426 
    427 	return ret;
    428 }
    429 
    430 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
    431 {
    432 	STACK_OF(X509) *signers;
    433 	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    434 	PKCS7_SIGNER_INFO *si;
    435 	PKCS7_ISSUER_AND_SERIAL *ias;
    436 	X509 *signer;
    437 	int i;
    438 
    439 	if(!p7) {
    440 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
    441 		return NULL;
    442 	}
    443 
    444 	if(!PKCS7_type_is_signed(p7)) {
    445 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
    446 		return NULL;
    447 	}
    448 
    449 	/* Collect all the signers together */
    450 
    451 	sinfos = PKCS7_get_signer_info(p7);
    452 
    453 	if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
    454 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
    455 		return 0;
    456 	}
    457 
    458 	if(!(signers = sk_X509_new_null())) {
    459 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
    460 		return NULL;
    461 	}
    462 
    463 	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
    464 	{
    465 	    si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
    466 	    ias = si->issuer_and_serial;
    467 	    signer = NULL;
    468 		/* If any certificates passed they take priority */
    469 	    if (certs) signer = X509_find_by_issuer_and_serial (certs,
    470 					 	ias->issuer, ias->serial);
    471 	    if (!signer && !(flags & PKCS7_NOINTERN)
    472 			&& p7->d.sign->cert) signer =
    473 		              X509_find_by_issuer_and_serial (p7->d.sign->cert,
    474 					      	ias->issuer, ias->serial);
    475 	    if (!signer) {
    476 			PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
    477 			sk_X509_free(signers);
    478 			return 0;
    479 	    }
    480 
    481 	    if (!sk_X509_push(signers, signer)) {
    482 		sk_X509_free(signers);
    483 		return NULL;
    484 	    }
    485 	}
    486 	return signers;
    487 }
    488 
    489 
    490 /* Build a complete PKCS#7 enveloped data */
    491 
    492 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
    493 								int flags)
    494 {
    495 	PKCS7 *p7;
    496 	BIO *p7bio = NULL;
    497 	int i;
    498 	X509 *x509;
    499 	if(!(p7 = PKCS7_new())) {
    500 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
    501 		return NULL;
    502 	}
    503 
    504 	if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
    505 		goto err;
    506 	if (!PKCS7_set_cipher(p7, cipher)) {
    507 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
    508 		goto err;
    509 	}
    510 
    511 	for(i = 0; i < sk_X509_num(certs); i++) {
    512 		x509 = sk_X509_value(certs, i);
    513 		if(!PKCS7_add_recipient(p7, x509)) {
    514 			PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
    515 					PKCS7_R_ERROR_ADDING_RECIPIENT);
    516 			goto err;
    517 		}
    518 	}
    519 
    520 	if (flags & PKCS7_STREAM)
    521 		return p7;
    522 
    523 	if (PKCS7_final(p7, in, flags))
    524 		return p7;
    525 
    526 	err:
    527 
    528 	BIO_free_all(p7bio);
    529 	PKCS7_free(p7);
    530 	return NULL;
    531 
    532 }
    533 
    534 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
    535 {
    536 	BIO *tmpmem;
    537 	int ret, i;
    538 	char buf[4096];
    539 
    540 	if(!p7) {
    541 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
    542 		return 0;
    543 	}
    544 
    545 	if(!PKCS7_type_is_enveloped(p7)) {
    546 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
    547 		return 0;
    548 	}
    549 
    550 	if(cert && !X509_check_private_key(cert, pkey)) {
    551 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,
    552 				PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
    553 		return 0;
    554 	}
    555 
    556 	if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
    557 		PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
    558 		return 0;
    559 	}
    560 
    561 	if (flags & PKCS7_TEXT) {
    562 		BIO *tmpbuf, *bread;
    563 		/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
    564 		if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
    565 			PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
    566 			BIO_free_all(tmpmem);
    567 			return 0;
    568 		}
    569 		if(!(bread = BIO_push(tmpbuf, tmpmem))) {
    570 			PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
    571 			BIO_free_all(tmpbuf);
    572 			BIO_free_all(tmpmem);
    573 			return 0;
    574 		}
    575 		ret = SMIME_text(bread, data);
    576 		BIO_free_all(bread);
    577 		return ret;
    578 	} else {
    579 		for(;;) {
    580 			i = BIO_read(tmpmem, buf, sizeof(buf));
    581 			if(i <= 0) break;
    582 			BIO_write(data, buf, i);
    583 		}
    584 		BIO_free_all(tmpmem);
    585 		return 1;
    586 	}
    587 }
    588