/* crypto/rsa/rsa_saos.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.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/bn.h>

#include <openssl/rsa.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

EXPORT_C int RSA_sign_ASN1_OCTET_STRING(int type,

	const unsigned char *m, unsigned int m_len,

	unsigned char *sigret, unsigned int *siglen, RSA *rsa)

	{

	ASN1_OCTET_STRING sig;

	int i,j,ret=1;

	unsigned char *p,*s;

	sig.type=V_ASN1_OCTET_STRING;

	sig.length=m_len;

	sig.data=(unsigned char *)m;

	i=i2d_ASN1_OCTET_STRING(&sig,NULL);

	j=RSA_size(rsa);

	if (i > (j-RSA_PKCS1_PADDING_SIZE))

		{

		RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);

		return(0);

		}

	s=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);

	if (s == NULL)

		{

		RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);

		return(0);

		}

	p=s;

	i2d_ASN1_OCTET_STRING(&sig,&p);

	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);

	if (i <= 0)

		ret=0;

	else

		*siglen=i;

	OPENSSL_cleanse(s,(unsigned int)j+1);

	OPENSSL_free(s);

	return(ret);

	}

EXPORT_C int RSA_verify_ASN1_OCTET_STRING(int dtype,

	const unsigned char *m,

	unsigned int m_len, unsigned char *sigbuf, unsigned int siglen,

	RSA *rsa)

	{

	int i,ret=0;

	unsigned char *s;

	const unsigned char *p;

	ASN1_OCTET_STRING *sig=NULL;

	if (siglen != (unsigned int)RSA_size(rsa))

		{

		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_WRONG_SIGNATURE_LENGTH);

		return(0);

		}

	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);

	if (s == NULL)

		{

		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);

		goto err;

		}

	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);

	if (i <= 0) goto err;

	p=s;

	sig=d2i_ASN1_OCTET_STRING(NULL,&p,(long)i);

	if (sig == NULL) goto err;

	if (	((unsigned int)sig->length != m_len) ||

		(memcmp(m,sig->data,m_len) != 0))

		{

		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_BAD_SIGNATURE);

		}

	else

		ret=1;

err:

	if (sig != NULL) M_ASN1_OCTET_STRING_free(sig);

	if (s != NULL)

		{

		OPENSSL_cleanse(s,(unsigned int)siglen);

		OPENSSL_free(s);

		}

	return(ret);

	}