/* pk7_smime.c */

 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

  * project.

  */

 /* ====================================================================

  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer. 

  *

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in

  *    the documentation and/or other materials provided with the

  *    distribution.

  *

  * 3. All advertising materials mentioning features or use of this

  *    software must display the following acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

  *

  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    licensing@OpenSSL.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 6. Redistributions of any form whatsoever must retain the following

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

  *

  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 /* Simple PKCS#7 processing functions */

 #include <stdio.h>

 #include "cryptlib.h"

 #include <openssl/x509.h>

 #include <openssl/x509v3.h>

 EXPORT_C PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,

 		  BIO *data, int flags)

 {

 	PKCS7 *p7 = NULL;

 	PKCS7_SIGNER_INFO *si;

 	BIO *p7bio = NULL;

 	STACK_OF(X509_ALGOR) *smcap = NULL;

 	int i;

 	if(!X509_check_private_key(signcert, pkey)) {

 		PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);

                 return NULL;

 	}

 	if(!(p7 = PKCS7_new())) {

 		PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);

 		return NULL;

 	}

 	if (!PKCS7_set_type(p7, NID_pkcs7_signed))

 		goto err;

 	if (!PKCS7_content_new(p7, NID_pkcs7_data))

 		goto err;

 	if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {

 		PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);

 		goto err;

 	}

 	if(!(flags & PKCS7_NOCERTS)) {

 		if (!PKCS7_add_certificate(p7, signcert))

 			goto err;

 		if(certs) for(i = 0; i < sk_X509_num(certs); i++)

 			if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))

 				goto err;

 	}

 	if(!(flags & PKCS7_NOATTR)) {

 		if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,

 				V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)))

 			goto err;

 		/* Add SMIMECapabilities */

 		if(!(flags & PKCS7_NOSMIMECAP))

 		{

 		if(!(smcap = sk_X509_ALGOR_new_null())) {

 			PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);

 			goto err;

 		}

 #ifndef OPENSSL_NO_DES

 		if (!PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1))

 			goto err;

 #endif

 #ifndef OPENSSL_NO_RC2

 		if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128))

 			goto err;

 		if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64))

 			goto err;

 #endif

 #ifndef OPENSSL_NO_DES

 		if (!PKCS7_simple_smimecap (smcap, NID_des_cbc, -1))

 			goto err;

 #endif

 #ifndef OPENSSL_NO_RC2

 		if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40))

 			goto err;

 #endif

 		if (!PKCS7_add_attrib_smimecap (si, smcap))

 			goto err;

 		sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);

 		smcap = NULL;

 		}

 	}

 	if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);

 	if (flags & PKCS7_STREAM)

 		return p7;

 	if (!(p7bio = PKCS7_dataInit(p7, NULL))) {

 		PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);

 		goto err;

 	}

 	SMIME_crlf_copy(data, p7bio, flags);

 	        if (!PKCS7_dataFinal(p7,p7bio)) {

 		PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);

 		goto err;

 	}

 	BIO_free_all(p7bio);

 	return p7;

 err:

 	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);

 	BIO_free_all(p7bio);

 	PKCS7_free(p7);

 	return NULL;

 }

 EXPORT_C int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,

 					BIO *indata, BIO *out, int flags)

 {

 	STACK_OF(X509) *signers;

 	X509 *signer;

 	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;

 	PKCS7_SIGNER_INFO *si;

 	X509_STORE_CTX cert_ctx;

 #ifndef SYMBIAN	

 	char buf[4096];

 #else

   char buf[512];

 #endif

 	int i, j=0, k, ret = 0;

 	BIO *p7bio;

 	BIO *tmpin, *tmpout;

 	if(!p7) {

 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);

 		return 0;

 	}

 	if(!PKCS7_type_is_signed(p7)) {

 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);

 		return 0;

 	}

 	/* Check for no data and no content: no data to verify signature */

 	if(PKCS7_get_detached(p7) && !indata) {

 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);

 		return 0;

 	}

 #if 0

 	/* NB: this test commented out because some versions of Netscape

 	 * illegally include zero length content when signing data.

 	 */

 	/* Check for data and content: two sets of data */

 	if(!PKCS7_get_detached(p7) && indata) {

 				PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);

 		return 0;

 	}

 #endif

 	sinfos = PKCS7_get_signer_info(p7);

 	if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {

 		PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);

 		return 0;

 	}

 	signers = PKCS7_get0_signers(p7, certs, flags);

 	if(!signers) return 0;

 	/* Now verify the certificates */

 	if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {

 		signer = sk_X509_value (signers, k);

 		if (!(flags & PKCS7_NOCHAIN)) {

 			if(!X509_STORE_CTX_init(&cert_ctx, store, signer,

 							p7->d.sign->cert))

 				{

 				PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);

 				sk_X509_free(signers);

 				return 0;

 				}

 			X509_STORE_CTX_set_purpose(&cert_ctx,

 						X509_PURPOSE_SMIME_SIGN);

 		} else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);

 			sk_X509_free(signers);

 			return 0;

 		}

 		if (!(flags & PKCS7_NOCRL))

 			X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);

 		i = X509_verify_cert(&cert_ctx);

 		if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);

 		X509_STORE_CTX_cleanup(&cert_ctx);

 		if (i <= 0) {

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);

 			ERR_add_error_data(2, "Verify error:",

 					 X509_verify_cert_error_string(j));

 			sk_X509_free(signers);

 			return 0;

 		}

 		/* Check for revocation status here */

 	}

 	/* Performance optimization: if the content is a memory BIO then

 	 * store its contents in a temporary read only memory BIO. This

 	 * avoids potentially large numbers of slow copies of data which will

 	 * occur when reading from a read write memory BIO when signatures

 	 * are calculated.

 	 */

 	if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))

 		{

 		char *ptr;

 		long len;

 		len = BIO_get_mem_data(indata, &ptr);

 		tmpin = BIO_new_mem_buf(ptr, len);

 		if (tmpin == NULL)

 			{

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);

 			return 0;

 			}

 		}

 	else

 		tmpin = indata;

 	if (!(p7bio=PKCS7_dataInit(p7,tmpin)))

 		goto err;

 	if(flags & PKCS7_TEXT) {

 		if(!(tmpout = BIO_new(BIO_s_mem()))) {

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);

 			goto err;

 		}

 	} else tmpout = out;

 	/* We now have to 'read' from p7bio to calculate digests etc. */

 	for (;;)

 	{

 		i=BIO_read(p7bio,buf,sizeof(buf));

 		if (i <= 0) break;

 		if (tmpout) BIO_write(tmpout, buf, i);

 	}

 	if(flags & PKCS7_TEXT) {

 		if(!SMIME_text(tmpout, out)) {

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);

 			BIO_free(tmpout);

 			goto err;

 		}

 		BIO_free(tmpout);

 	}

 	/* Now Verify All Signatures */

 	if (!(flags & PKCS7_NOSIGS))

 	    for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)

 		{

 		si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);

 		signer = sk_X509_value (signers, i);

 		j=PKCS7_signatureVerify(p7bio,p7,si, signer);

 		if (j <= 0) {

 			PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);

 			goto err;

 		}

 	}

 	ret = 1;

 	err:

 	if (tmpin == indata)

 		{

 		if (indata) BIO_pop(p7bio);

 		}

 	BIO_free_all(p7bio);

 	sk_X509_free(signers);

 	return ret;

 }

 EXPORT_C STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)

 {

 	STACK_OF(X509) *signers;

 	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;

 	PKCS7_SIGNER_INFO *si;

 	PKCS7_ISSUER_AND_SERIAL *ias;

 	X509 *signer;

 	int i;

 	if(!p7) {

 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);

 		return NULL;

 	}

 	if(!PKCS7_type_is_signed(p7)) {

 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);

 		return NULL;

 	}

 	/* Collect all the signers together */

 	sinfos = PKCS7_get_signer_info(p7);

 	if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {

 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);

 		return NULL;

 	}

 	if(!(signers = sk_X509_new_null())) {

 		PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);

 		return NULL;

 	}

 	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)

 	{

 	    si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);

 	    ias = si->issuer_and_serial;

 	    signer = NULL;

 		/* If any certificates passed they take priority */

 	    if (certs) signer = X509_find_by_issuer_and_serial (certs,

 					 	ias->issuer, ias->serial);

 	    if (!signer && !(flags & PKCS7_NOINTERN)

 			&& p7->d.sign->cert) signer =

 		              X509_find_by_issuer_and_serial (p7->d.sign->cert,

 					      	ias->issuer, ias->serial);

 	    if (!signer) {

 			PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);

 			sk_X509_free(signers);

 			return NULL;

 	    }

 	    if (!sk_X509_push(signers, signer)) {

 			sk_X509_free(signers);

 			return NULL;

 	    }

 	}

 	return signers;

 }

 /* Build a complete PKCS#7 enveloped data */

 EXPORT_C PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,

 								int flags)

 {

 	PKCS7 *p7;

 	BIO *p7bio = NULL;

 	int i;

 	X509 *x509;

 	if(!(p7 = PKCS7_new())) {

 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);

 		return NULL;

 	}

 	if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))

 		goto err;

 	if(!PKCS7_set_cipher(p7, cipher)) {

 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);

 		goto err;

 	}

 	for(i = 0; i < sk_X509_num(certs); i++) {

 		x509 = sk_X509_value(certs, i);

 		if(!PKCS7_add_recipient(p7, x509)) {

 			PKCS7err(PKCS7_F_PKCS7_ENCRYPT,

 					PKCS7_R_ERROR_ADDING_RECIPIENT);

 			goto err;

 		}

 	}

 	if(!(p7bio = PKCS7_dataInit(p7, NULL))) {

 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);

 		goto err;

 	}

 	SMIME_crlf_copy(in, p7bio, flags);

 	(void)BIO_flush(p7bio);

         if (!PKCS7_dataFinal(p7,p7bio)) {

 		PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);

 		goto err;

 	}

         BIO_free_all(p7bio);

 	return p7;

 	err:

 	BIO_free_all(p7bio);

 	PKCS7_free(p7);

 	return NULL;

 }

 EXPORT_C int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)

 {

 	BIO *tmpmem;

 	int ret, i;

 #ifndef SYMBIAN	

 	char buf[4096];

 #else

   char buf[512];

 #endif	

 	if(!p7) {

 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);

 		return 0;

 	}

 	if(!PKCS7_type_is_enveloped(p7)) {

 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);

 		return 0;

 	}

 	if(cert && !X509_check_private_key(cert, pkey)) {

 		PKCS7err(PKCS7_F_PKCS7_DECRYPT,

 				PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);

 		return 0;

 	}

 	if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {

 		PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);

 		return 0;

 	}

 	if (flags & PKCS7_TEXT) {

 		BIO *tmpbuf, *bread;

 		/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */

 		if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {

 			PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);

 			BIO_free_all(tmpmem);

 			return 0;

 		}

 		if(!(bread = BIO_push(tmpbuf, tmpmem))) {

 			PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);

 			BIO_free_all(tmpbuf);

 			BIO_free_all(tmpmem);

 			return 0;

 		}

 		ret = SMIME_text(bread, data);

 		BIO_free_all(bread);

 		return ret;

 	} else {

 		for(;;) {

 			i = BIO_read(tmpmem, buf, sizeof(buf));

 			if(i <= 0) break;

 			BIO_write(data, buf, i);

 		}

 		BIO_free_all(tmpmem);

 		return 1;

 	}

 }