[thirdparty/openssl.git] / crypto / rsa / rsa_sign.c

/* 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>

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

int RSA_sign(int type, 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,*s = NULL;
	X509_ALGOR algor;
	ASN1_OCTET_STRING digest;
	if(rsa->flags & RSA_FLAG_SIGN_VER)
	      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=m;
		sig.digest->length=m_len;

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

	if(type != NID_md5_sha1) {
		memset(s,0,(unsigned int)j+1);
		Free(s);
	}
	return(ret);
	}

int RSA_verify(int dtype, unsigned char *m, unsigned int m_len,
	     unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
	{
	int i,ret=0,sigtype;
	unsigned char *p,*s;
	X509_SIG *sig=NULL;

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

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

	s=(unsigned char *)Malloc((unsigned int)siglen);
	if (s == NULL)
		{
		RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
		goto err;
		}
	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
			RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
			return(0);
	}
	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_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
		else ret = 1;
	} else {
		p=s;
		sig=d2i_X509_SIG(NULL,&p,(long)i);

		if (sig == NULL) 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(NO_STDIO) && !defined(WIN16)
				fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
	#endif
				}
			else
				{
				RSAerr(RSA_F_RSA_VERIFY,
						RSA_R_ALGORITHM_MISMATCH);
				goto err;
				}
			}
		if (	((unsigned int)sig->digest->length != m_len) ||
			(memcmp(m,sig->digest->data,m_len) != 0))
			{
			RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
			}
		else
			ret=1;
	}
err:
	if (sig != NULL) X509_SIG_free(sig);
	memset(s,0,(unsigned int)siglen);
	Free(s);
	return(ret);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/rsa/rsa_sign.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822 BM	61	#include <openssl/bn.h>
	62	#include <openssl/rsa.h>
	63	#include <openssl/objects.h>
	64	#include <openssl/x509.h>
d02b48c6	65
1c80019a DSH	66	/* Size of an SSL signature: MD5+SHA1 */
	67	#define SSL_SIG_LENGTH 36
	68
6b691a5c UM	69	int RSA_sign(int type, unsigned char *m, unsigned int m_len,
6b691a5c UM	70	unsigned char sigret, unsigned int siglen, RSA *rsa)
d02b48c6 RE	71	{
	72	X509_SIG sig;
	73	ASN1_TYPE parameter;
	74	int i,j,ret=1;
1c80019a	75	unsigned char p,s = NULL;
d02b48c6 RE	76	X509_ALGOR algor;
d02b48c6 RE	77	ASN1_OCTET_STRING digest;
1c80019a DSH	78	if(rsa->flags & RSA_FLAG_SIGN_VER)
	79	return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
	80	/* Special case: SSL signature, just check the length */
	81	if(type == NID_md5_sha1) {
	82	if(m_len != SSL_SIG_LENGTH) {
	83	RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
	84	return(0);
d02b48c6	85	}
1c80019a DSH	86	i = SSL_SIG_LENGTH;
	87	s = m;
	88	} else {
	89	sig.algor= &algor;
	90	sig.algor->algorithm=OBJ_nid2obj(type);
	91	if (sig.algor->algorithm == NULL)
	92	{
	93	RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
	94	return(0);
	95	}
	96	if (sig.algor->algorithm->length == 0)
	97	{
	98	RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
	99	return(0);
	100	}
	101	parameter.type=V_ASN1_NULL;
	102	parameter.value.ptr=NULL;
	103	sig.algor->parameter= &parameter;
d02b48c6	104
1c80019a DSH	105	sig.digest= &digest;
	106	sig.digest->data=m;
	107	sig.digest->length=m_len;
d02b48c6	108
1c80019a DSH	109	i=i2d_X509_SIG(&sig,NULL);
1c80019a DSH	110	}
d02b48c6 RE	111	j=RSA_size(rsa);
	112	if ((i-RSA_PKCS1_PADDING) > j)
	113	{
	114	RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
	115	return(0);
	116	}
1c80019a DSH	117	if(type != NID_md5_sha1) {
	118	s=(unsigned char *)Malloc((unsigned int)j+1);
	119	if (s == NULL)
	120	{
	121	RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
	122	return(0);
	123	}
	124	p=s;
	125	i2d_X509_SIG(&sig,&p);
	126	}
d02b48c6 RE	127	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
	128	if (i <= 0)
	129	ret=0;
	130	else
	131	*siglen=i;
	132
1c80019a DSH	133	if(type != NID_md5_sha1) {
	134	memset(s,0,(unsigned int)j+1);
	135	Free(s);
	136	}
d02b48c6 RE	137	return(ret);
	138	}
	139
6b691a5c UM	140	int RSA_verify(int dtype, unsigned char *m, unsigned int m_len,
6b691a5c UM	141	unsigned char sigbuf, unsigned int siglen, RSA rsa)
d02b48c6 RE	142	{
	143	int i,ret=0,sigtype;
	144	unsigned char p,s;
	145	X509_SIG *sig=NULL;
	146
	147	if (siglen != (unsigned int)RSA_size(rsa))
	148	{
	149	RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
	150	return(0);
	151	}
	152
1c80019a DSH	153	if(rsa->flags & RSA_FLAG_SIGN_VER)
	154	return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
	155
d02b48c6 RE	156	s=(unsigned char *)Malloc((unsigned int)siglen);
	157	if (s == NULL)
	158	{
	159	RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
	160	goto err;
	161	}
1c80019a DSH	162	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
	163	RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
	164	return(0);
	165	}
d02b48c6 RE	166	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
	167
	168	if (i <= 0) goto err;
	169
1c80019a DSH	170	/* Special case: SSL signature */
	171	if(dtype == NID_md5_sha1) {
	172	if((i != SSL_SIG_LENGTH) \|\| memcmp(s, m, SSL_SIG_LENGTH))
	173	RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	174	else ret = 1;
	175	} else {
	176	p=s;
	177	sig=d2i_X509_SIG(NULL,&p,(long)i);
dfeab068	178
1c80019a DSH	179	if (sig == NULL) goto err;
1c80019a DSH	180	sigtype=OBJ_obj2nid(sig->algor->algorithm);
d02b48c6	181
dfeab068	182
1c80019a	183	#ifdef RSA_DEBUG
657e60fa	184	/* put a backward compatibility flag in EAY */
1c80019a DSH	185	fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
	186	OBJ_nid2ln(dtype));
	187	#endif
	188	if (sigtype != dtype)
d02b48c6	189	{
1c80019a DSH	190	if (((dtype == NID_md5) &&
	191	(sigtype == NID_md5WithRSAEncryption)) \|\|
	192	((dtype == NID_md2) &&
	193	(sigtype == NID_md2WithRSAEncryption)))
	194	{
	195	/* ok, we will let it through */
	196	#if !defined(NO_STDIO) && !defined(WIN16)
	197	fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
	198	#endif
	199	}
	200	else
	201	{
	202	RSAerr(RSA_F_RSA_VERIFY,
	203	RSA_R_ALGORITHM_MISMATCH);
	204	goto err;
	205	}
d02b48c6	206	}
1c80019a DSH	207	if ( ((unsigned int)sig->digest->length != m_len) \|\|
1c80019a DSH	208	(memcmp(m,sig->digest->data,m_len) != 0))
d02b48c6	209	{
1c80019a	210	RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
d02b48c6	211	}
1c80019a DSH	212	else
	213	ret=1;
	214	}
d02b48c6 RE	215	err:
	216	if (sig != NULL) X509_SIG_free(sig);
	217	memset(s,0,(unsigned int)siglen);
	218	Free(s);
	219	return(ret);
	220	}
	221