crypto/rsa/rsa_sign.c - third_party/openssl - Git at Google

 /* crypto/rsa/rsa_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.]
  */

 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/bn.h>
 #include <openssl/rsa.h>
 #include <openssl/objects.h>
 #include <openssl/x509.h>
 #include "rsa_locl.h"

 /* Size of an SSL signature: MD5+SHA1 */
 #define SSL_SIG_LENGTH	36

 int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
 	     unsigned char *sigret, unsigned int *siglen, RSA *rsa)
 	{
 	X509_SIG sig;
 	ASN1_TYPE parameter;
 	int i,j,ret=1;
 	unsigned char *p, *tmps = NULL;
 	const unsigned char *s = NULL;
 	X509_ALGOR algor;
 	ASN1_OCTET_STRING digest;
 	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
 		{
 		return rsa->meth->rsa_sign(type, m, m_len,
 			sigret, siglen, rsa);
 		}
 	/* Special case: SSL signature, just check the length */
 	if(type == NID_md5_sha1) {
 		if(m_len != SSL_SIG_LENGTH) {
 			RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
 			return(0);
 		}
 		i = SSL_SIG_LENGTH;
 		s = m;
 	} else {
 		sig.algor= &algor;
 		sig.algor->algorithm=OBJ_nid2obj(type);
 		if (sig.algor->algorithm == NULL)
 			{
 			RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
 			return(0);
 			}
 		if (sig.algor->algorithm->length == 0)
 			{
 			RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
 			return(0);
 			}
 		parameter.type=V_ASN1_NULL;
 		parameter.value.ptr=NULL;
 		sig.algor->parameter= &parameter;

 		sig.digest= &digest;
 		sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
 		sig.digest->length=m_len;

 		i=i2d_X509_SIG(&sig,NULL);
 	}
 	j=RSA_size(rsa);
 	if (i > (j-RSA_PKCS1_PADDING_SIZE))
 		{
 		RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
 		return(0);
 		}
 	if(type != NID_md5_sha1) {
 		tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
 		if (tmps == NULL)
 			{
 			RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
 			return(0);
 			}
 		p=tmps;
 		i2d_X509_SIG(&sig,&p);
 		s=tmps;
 	}
 	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
 	if (i <= 0)
 		ret=0;
 	else
 		*siglen=i;

 	if(type != NID_md5_sha1) {
 		OPENSSL_cleanse(tmps,(unsigned int)j+1);
 		OPENSSL_free(tmps);
 	}
 	return(ret);
 	}

 int int_rsa_verify(int dtype, const unsigned char *m,
 			  unsigned int m_len,
 			  unsigned char *rm, size_t *prm_len,
 			  const unsigned char *sigbuf, size_t siglen,
 			  RSA *rsa)
 	{
 	int i,ret=0,sigtype;
 	unsigned char *s;
 	X509_SIG *sig=NULL;

 	if (siglen != (unsigned int)RSA_size(rsa))
 		{
 		RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
 		return(0);
 		}

 	if((dtype == NID_md5_sha1) && rm)
 		{
 		i = RSA_public_decrypt((int)siglen,
 					sigbuf,rm,rsa,RSA_PKCS1_PADDING);
 		if (i <= 0)
 			return 0;
 		*prm_len = i;
 		return 1;
 		}

 	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
 	if (s == NULL)
 		{
 		RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
 		goto err;
 		}
 	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
 			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
 			goto err;
 	}
 	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);

 	if (i <= 0) goto err;

 	/* Special case: SSL signature */
 	if(dtype == NID_md5_sha1) {
 		if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
 				RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 		else ret = 1;
 	} else {
 		const unsigned char *p=s;
 		sig=d2i_X509_SIG(NULL,&p,(long)i);

 		if (sig == NULL) goto err;

 		/* Excess data can be used to create forgeries */
 		if(p != s+i)
 			{
 			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 			goto err;
 			}

 		/* Parameters to the signature algorithm can also be used to
 		   create forgeries */
 		if(sig->algor->parameter
 		   && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
 			{
 			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 			goto err;
 			}

 		sigtype=OBJ_obj2nid(sig->algor->algorithm);


 	#ifdef RSA_DEBUG
 		/* put a backward compatibility flag in EAY */
 		fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
 			OBJ_nid2ln(dtype));
 	#endif
 		if (sigtype != dtype)
 			{
 			if (((dtype == NID_md5) &&
 				(sigtype == NID_md5WithRSAEncryption)) ||
 				((dtype == NID_md2) &&
 				(sigtype == NID_md2WithRSAEncryption)))
 				{
 				/* ok, we will let it through */
 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
 				fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
 #endif
 				}
 			else
 				{
 				RSAerr(RSA_F_INT_RSA_VERIFY,
 						RSA_R_ALGORITHM_MISMATCH);
 				goto err;
 				}
 			}
 		if (rm)
 			{
 			const EVP_MD *md;
 			md = EVP_get_digestbynid(dtype);
 			if (md && (EVP_MD_size(md) != sig->digest->length))
 				RSAerr(RSA_F_INT_RSA_VERIFY,
 						RSA_R_INVALID_DIGEST_LENGTH);
 			else
 				{
 				memcpy(rm, sig->digest->data,
 							sig->digest->length);
 				*prm_len = sig->digest->length;
 				ret = 1;
 				}
 			}
 		else if (((unsigned int)sig->digest->length != m_len) ||
 			(memcmp(m,sig->digest->data,m_len) != 0))
 			{
 			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
 			}
 		else
 			ret=1;
 	}
 err:
 	if (sig != NULL) X509_SIG_free(sig);
 	if (s != NULL)
 		{
 		OPENSSL_cleanse(s,(unsigned int)siglen);
 		OPENSSL_free(s);
 		}
 	return(ret);
 	}

 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
 		const unsigned char *sigbuf, unsigned int siglen,
 		RSA *rsa)
 	{

 	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
 		{
 		return rsa->meth->rsa_verify(dtype, m, m_len,
 			sigbuf, siglen, rsa);
 		}

 	return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
 	}
	/* crypto/rsa/rsa_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.]
	*/

	#include <stdio.h>
	#include "cryptlib.h"
	#include <openssl/bn.h>
	#include <openssl/rsa.h>
	#include <openssl/objects.h>
	#include <openssl/x509.h>
	#include "rsa_locl.h"

	/* Size of an SSL signature: MD5+SHA1 */
	#define SSL_SIG_LENGTH 36

	int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
	unsigned char sigret, unsigned int siglen, RSA *rsa)
	{
	X509_SIG sig;
	ASN1_TYPE parameter;
	int i,j,ret=1;
	unsigned char p, tmps = NULL;
	const unsigned char *s = NULL;
	X509_ALGOR algor;
	ASN1_OCTET_STRING digest;
	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
	{
	return rsa->meth->rsa_sign(type, m, m_len,
	sigret, siglen, rsa);
	}
	/* Special case: SSL signature, just check the length */
	if(type == NID_md5_sha1) {
	if(m_len != SSL_SIG_LENGTH) {
	RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
	return(0);
	}
	i = SSL_SIG_LENGTH;
	s = m;
	} else {
	sig.algor= &algor;
	sig.algor->algorithm=OBJ_nid2obj(type);
	if (sig.algor->algorithm == NULL)
	{
	RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
	return(0);
	}
	if (sig.algor->algorithm->length == 0)
	{
	RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
	return(0);
	}
	parameter.type=V_ASN1_NULL;
	parameter.value.ptr=NULL;
	sig.algor->parameter= &parameter;

	sig.digest= &digest;
	sig.digest->data=(unsigned char )m; / TMP UGLY CAST */
	sig.digest->length=m_len;

	i=i2d_X509_SIG(&sig,NULL);
	}
	j=RSA_size(rsa);
	if (i > (j-RSA_PKCS1_PADDING_SIZE))
	{
	RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
	return(0);
	}
	if(type != NID_md5_sha1) {
	tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
	if (tmps == NULL)
	{
	RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
	return(0);
	}
	p=tmps;
	i2d_X509_SIG(&sig,&p);
	s=tmps;
	}
	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
	if (i <= 0)
	ret=0;
	else
	*siglen=i;

	if(type != NID_md5_sha1) {
	OPENSSL_cleanse(tmps,(unsigned int)j+1);
	OPENSSL_free(tmps);
	}
	return(ret);
	}

	int int_rsa_verify(int dtype, const unsigned char *m,
	unsigned int m_len,
	unsigned char rm, size_t prm_len,
	const unsigned char *sigbuf, size_t siglen,
	RSA *rsa)
	{
	int i,ret=0,sigtype;
	unsigned char *s;
	X509_SIG *sig=NULL;

	if (siglen != (unsigned int)RSA_size(rsa))
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
	return(0);
	}

	if((dtype == NID_md5_sha1) && rm)
	{
	i = RSA_public_decrypt((int)siglen,
	sigbuf,rm,rsa,RSA_PKCS1_PADDING);
	if (i <= 0)
	return 0;
	*prm_len = i;
	return 1;
	}

	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
	if (s == NULL)
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
	goto err;
	}
	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
	goto err;
	}
	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);

	if (i <= 0) goto err;

	/* Special case: SSL signature */
	if(dtype == NID_md5_sha1) {
	if((i != SSL_SIG_LENGTH) \|\| memcmp(s, m, SSL_SIG_LENGTH))
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	else ret = 1;
	} else {
	const unsigned char *p=s;
	sig=d2i_X509_SIG(NULL,&p,(long)i);

	if (sig == NULL) goto err;

	/* Excess data can be used to create forgeries */
	if(p != s+i)
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	goto err;
	}

	/* Parameters to the signature algorithm can also be used to
	create forgeries */
	if(sig->algor->parameter
	&& ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	goto err;
	}

	sigtype=OBJ_obj2nid(sig->algor->algorithm);


	#ifdef RSA_DEBUG
	/* put a backward compatibility flag in EAY */
	fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
	OBJ_nid2ln(dtype));
	#endif
	if (sigtype != dtype)
	{
	if (((dtype == NID_md5) &&
	(sigtype == NID_md5WithRSAEncryption)) \|\|
	((dtype == NID_md2) &&
	(sigtype == NID_md2WithRSAEncryption)))
	{
	/* ok, we will let it through */
	#if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
	fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
	#endif
	}
	else
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,
	RSA_R_ALGORITHM_MISMATCH);
	goto err;
	}
	}
	if (rm)
	{
	const EVP_MD *md;
	md = EVP_get_digestbynid(dtype);
	if (md && (EVP_MD_size(md) != sig->digest->length))
	RSAerr(RSA_F_INT_RSA_VERIFY,
	RSA_R_INVALID_DIGEST_LENGTH);
	else
	{
	memcpy(rm, sig->digest->data,
	sig->digest->length);
	*prm_len = sig->digest->length;
	ret = 1;
	}
	}
	else if (((unsigned int)sig->digest->length != m_len) \|\|
	(memcmp(m,sig->digest->data,m_len) != 0))
	{
	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	}
	else
	ret=1;
	}
	err:
	if (sig != NULL) X509_SIG_free(sig);
	if (s != NULL)
	{
	OPENSSL_cleanse(s,(unsigned int)siglen);
	OPENSSL_free(s);
	}
	return(ret);
	}

	int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
	const unsigned char *sigbuf, unsigned int siglen,
	RSA *rsa)
	{

	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
	{
	return rsa->meth->rsa_verify(dtype, m, m_len,
	sigbuf, siglen, rsa);
	}

	return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
	}