/* crypto/asn1/a_sign.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

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

 * Copyright (c) 1998-2003 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

 *    openssl-core@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).

 *

 */

#include <stdio.h>

#include <time.h>

#include "cryptlib.h"

#ifndef NO_SYS_TYPES_H

# include <sys/types.h>

#endif

#include <openssl/bn.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/objects.h>

#include <openssl/buffer.h>

#ifndef NO_ASN1_OLD

EXPORT_C int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,

	      ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,

	      const EVP_MD *type)

	{

	EVP_MD_CTX ctx;

	unsigned char *p,*buf_in=NULL,*buf_out=NULL;

	int i,inl=0,outl=0,outll=0;

	X509_ALGOR *a;

	EVP_MD_CTX_init(&ctx);

	for (i=0; i<2; i++)

		{

		if (i == 0)

			a=algor1;

		else

			a=algor2;

		if (a == NULL) continue;

                if (type->pkey_type == NID_dsaWithSHA1)

			{

			/* special case: RFC 2459 tells us to omit 'parameters'

			 * with id-dsa-with-sha1 */

			ASN1_TYPE_free(a->parameter);

			a->parameter = NULL;

			}

		else if ((a->parameter == NULL) || 

			(a->parameter->type != V_ASN1_NULL))

			{

			ASN1_TYPE_free(a->parameter);

			if ((a->parameter=ASN1_TYPE_new()) == NULL) goto err;

			a->parameter->type=V_ASN1_NULL;

			}

		ASN1_OBJECT_free(a->algorithm);

		a->algorithm=OBJ_nid2obj(type->pkey_type);

		if (a->algorithm == NULL)

			{

			ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE);

			goto err;

			}

		if (a->algorithm->length == 0)

			{

			ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);

			goto err;

			}

		}

	inl=i2d(data,NULL);

	buf_in=(unsigned char *)OPENSSL_malloc((unsigned int)inl);

	outll=outl=EVP_PKEY_size(pkey);

	buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl);

	if ((buf_in == NULL) || (buf_out == NULL))

		{

		outl=0;

		ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	p=buf_in;

	i2d(data,&p);

	EVP_SignInit_ex(&ctx,type, NULL);

	EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl);

	if (!EVP_SignFinal(&ctx,(unsigned char *)buf_out,

			(unsigned int *)&outl,pkey))

		{

		outl=0;

		ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB);

		goto err;

		}

	if (signature->data != NULL) OPENSSL_free(signature->data);

	signature->data=buf_out;

	buf_out=NULL;

	signature->length=outl;

	/* In the interests of compatibility, I'll make sure that

	 * the bit string has a 'not-used bits' value of 0

	 */

	signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);

	signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;

err:

	EVP_MD_CTX_cleanup(&ctx);

	if (buf_in != NULL)

		{ OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }

	if (buf_out != NULL)

		{ OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }

	return(outl);

	}

#endif

EXPORT_C int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,

	     ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,

	     const EVP_MD *type)

	{

	EVP_MD_CTX ctx;

	unsigned char *buf_in=NULL,*buf_out=NULL;

	int i,inl=0,outl=0,outll=0;

	X509_ALGOR *a;

	EVP_MD_CTX_init(&ctx);

	for (i=0; i<2; i++)

		{

		if (i == 0)

			a=algor1;

		else

			a=algor2;

		if (a == NULL) continue;

                if (type->pkey_type == NID_dsaWithSHA1 ||

			type->pkey_type == NID_ecdsa_with_SHA1)

			{

			/* special case: RFC 3279 tells us to omit 'parameters'

			 * with id-dsa-with-sha1 and ecdsa-with-SHA1 */

			ASN1_TYPE_free(a->parameter);

			a->parameter = NULL;

			}

		else if ((a->parameter == NULL) || 

			(a->parameter->type != V_ASN1_NULL))

			{

			ASN1_TYPE_free(a->parameter);

			if ((a->parameter=ASN1_TYPE_new()) == NULL) goto err;

			a->parameter->type=V_ASN1_NULL;

			}

		ASN1_OBJECT_free(a->algorithm);

		a->algorithm=OBJ_nid2obj(type->pkey_type);

		if (a->algorithm == NULL)

			{

			ASN1err(ASN1_F_ASN1_ITEM_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE);

			goto err;

			}

		if (a->algorithm->length == 0)

			{

			ASN1err(ASN1_F_ASN1_ITEM_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);

			goto err;

			}

		}

	inl=ASN1_item_i2d(asn,&buf_in, it);

	outll=outl=EVP_PKEY_size(pkey);

	buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl);

	if ((buf_in == NULL) || (buf_out == NULL))

		{

		outl=0;

		ASN1err(ASN1_F_ASN1_ITEM_SIGN,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	EVP_SignInit_ex(&ctx,type, NULL);

	EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl);

	if (!EVP_SignFinal(&ctx,(unsigned char *)buf_out,

			(unsigned int *)&outl,pkey))

		{

		outl=0;

		ASN1err(ASN1_F_ASN1_ITEM_SIGN,ERR_R_EVP_LIB);

		goto err;

		}

	if (signature->data != NULL) OPENSSL_free(signature->data);

	signature->data=buf_out;

	buf_out=NULL;

	signature->length=outl;

	/* In the interests of compatibility, I'll make sure that

	 * the bit string has a 'not-used bits' value of 0

	 */

	signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);

	signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;

err:

	EVP_MD_CTX_cleanup(&ctx);

	if (buf_in != NULL)

		{ OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }

	if (buf_out != NULL)

		{ OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }

	return(outl);

	}