[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>
#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);
	}

/*
 * Check DigestInfo structure does not contain extraneous data by reencoding
 * using DER and checking encoding against original. 
 */
static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo, int dinfolen)
	{
	unsigned char *der = NULL;
	int derlen;
	int ret = 0;
	derlen = i2d_X509_SIG(sig, &der);
	if (derlen <= 0)
		return 0;
	if (derlen == dinfolen && !memcmp(dinfo, der, derlen))
		ret = 1;
	OPENSSL_cleanse(der, derlen);
	OPENSSL_free(der);
	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;
	/* Oddball MDC2 case: signature can be OCTET STRING.
	 * check for correct tag and length octets.
	 */
	if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10)
		{
		if (rm)
			{
			memcpy(rm, s + 2, 16);
			*prm_len = 16;
			ret = 1;
			}
		else if(memcmp(m, s + 2, 16))
			RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
		else
			ret = 1;
		}

	/* 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 || !rsa_check_digestinfo(sig, 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)
				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);
	}
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>
777c47ac	65	#include "rsa_locl.h"
d02b48c6	66
1c80019a DSH	67	/* Size of an SSL signature: MD5+SHA1 */
	68	#define SSL_SIG_LENGTH 36
	69
29c1f061	70	int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
816d7857	71	unsigned char sigret, unsigned int siglen, RSA *rsa)
d02b48c6 RE	72	{
	73	X509_SIG sig;
	74	ASN1_TYPE parameter;
	75	int i,j,ret=1;
29c1f061 RL	76	unsigned char p, tmps = NULL;
29c1f061 RL	77	const unsigned char *s = NULL;
d02b48c6 RE	78	X509_ALGOR algor;
d02b48c6 RE	79	ASN1_OCTET_STRING digest;
667aef4c	80	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
0a861ab7	81	{
0a861ab7 RL	82	return rsa->meth->rsa_sign(type, m, m_len,
	83	sigret, siglen, rsa);
	84	}
1c80019a DSH	85	/* Special case: SSL signature, just check the length */
	86	if(type == NID_md5_sha1) {
	87	if(m_len != SSL_SIG_LENGTH) {
	88	RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
	89	return(0);
d02b48c6	90	}
1c80019a DSH	91	i = SSL_SIG_LENGTH;
	92	s = m;
	93	} else {
	94	sig.algor= &algor;
	95	sig.algor->algorithm=OBJ_nid2obj(type);
	96	if (sig.algor->algorithm == NULL)
	97	{
	98	RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
	99	return(0);
	100	}
	101	if (sig.algor->algorithm->length == 0)
	102	{
	103	RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
	104	return(0);
	105	}
	106	parameter.type=V_ASN1_NULL;
	107	parameter.value.ptr=NULL;
	108	sig.algor->parameter= &parameter;
d02b48c6	109
1c80019a	110	sig.digest= &digest;
29c1f061	111	sig.digest->data=(unsigned char )m; / TMP UGLY CAST */
1c80019a	112	sig.digest->length=m_len;
d02b48c6	113
1c80019a DSH	114	i=i2d_X509_SIG(&sig,NULL);
1c80019a DSH	115	}
d02b48c6	116	j=RSA_size(rsa);
ba8ad074	117	if (i > (j-RSA_PKCS1_PADDING_SIZE))
d02b48c6 RE	118	{
	119	RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
	120	return(0);
	121	}
1c80019a	122	if(type != NID_md5_sha1) {
29c1f061 RL	123	tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
29c1f061 RL	124	if (tmps == NULL)
1c80019a DSH	125	{
	126	RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
	127	return(0);
	128	}
29c1f061	129	p=tmps;
1c80019a	130	i2d_X509_SIG(&sig,&p);
29c1f061	131	s=tmps;
1c80019a	132	}
d02b48c6 RE	133	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
	134	if (i <= 0)
	135	ret=0;
	136	else
	137	*siglen=i;
	138
1c80019a	139	if(type != NID_md5_sha1) {
4579924b	140	OPENSSL_cleanse(tmps,(unsigned int)j+1);
29c1f061	141	OPENSSL_free(tmps);
1c80019a	142	}
d02b48c6 RE	143	return(ret);
	144	}
	145
1cfd255c DSH	146	/*
	147	* Check DigestInfo structure does not contain extraneous data by reencoding
	148	* using DER and checking encoding against original.
	149	*/
	150	static int rsa_check_digestinfo(X509_SIG sig, const unsigned char dinfo, int dinfolen)
	151	{
	152	unsigned char *der = NULL;
	153	int derlen;
	154	int ret = 0;
	155	derlen = i2d_X509_SIG(sig, &der);
	156	if (derlen <= 0)
	157	return 0;
	158	if (derlen == dinfolen && !memcmp(dinfo, der, derlen))
	159	ret = 1;
	160	OPENSSL_cleanse(der, derlen);
	161	OPENSSL_free(der);
	162	return ret;
	163	}
	164
777c47ac BL	165	int int_rsa_verify(int dtype, const unsigned char *m,
777c47ac BL	166	unsigned int m_len,
c80c7bf9 DSH	167	unsigned char rm, size_t prm_len,
c80c7bf9 DSH	168	const unsigned char *sigbuf, size_t siglen,
777c47ac	169	RSA *rsa)
d02b48c6 RE	170	{
d02b48c6 RE	171	int i,ret=0,sigtype;
875a644a	172	unsigned char *s;
d02b48c6 RE	173	X509_SIG *sig=NULL;
	174
	175	if (siglen != (unsigned int)RSA_size(rsa))
	176	{
5c95c2ac	177	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
d02b48c6 RE	178	return(0);
	179	}
	180
b2a97be7	181	if((dtype == NID_md5_sha1) && rm)
0a861ab7	182	{
b2a97be7 DSH	183	i = RSA_public_decrypt((int)siglen,
	184	sigbuf,rm,rsa,RSA_PKCS1_PADDING);
	185	if (i <= 0)
	186	return 0;
	187	*prm_len = i;
	188	return 1;
0a861ab7	189	}
1c80019a	190
26a3a48d	191	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
d02b48c6 RE	192	if (s == NULL)
d02b48c6 RE	193	{
5c95c2ac	194	RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
d02b48c6 RE	195	goto err;
d02b48c6 RE	196	}
1c80019a	197	if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
5c95c2ac	198	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
a0e7c8ee	199	goto err;
1c80019a	200	}
d02b48c6 RE	201	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
	202
	203	if (i <= 0) goto err;
83cb7c46 DSH	204	/* Oddball MDC2 case: signature can be OCTET STRING.
	205	* check for correct tag and length octets.
	206	*/
	207	if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10)
	208	{
	209	if (rm)
	210	{
	211	memcpy(rm, s + 2, 16);
	212	*prm_len = 16;
	213	ret = 1;
	214	}
	215	else if(memcmp(m, s + 2, 16))
	216	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	217	else
	218	ret = 1;
	219	}
d02b48c6	220
1c80019a DSH	221	/* Special case: SSL signature */
	222	if(dtype == NID_md5_sha1) {
	223	if((i != SSL_SIG_LENGTH) \|\| memcmp(s, m, SSL_SIG_LENGTH))
5c95c2ac	224	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
1c80019a DSH	225	else ret = 1;
1c80019a DSH	226	} else {
875a644a	227	const unsigned char *p=s;
1c80019a	228	sig=d2i_X509_SIG(NULL,&p,(long)i);
dfeab068	229
1c80019a	230	if (sig == NULL) goto err;
b79aa05e MC	231
b79aa05e MC	232	/* Excess data can be used to create forgeries */
1cfd255c	233	if(p != s+i \|\| !rsa_check_digestinfo(sig, s, i))
b79aa05e	234	{
a291745e	235	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
b79aa05e MC	236	goto err;
	237	}
	238
	239	/* Parameters to the signature algorithm can also be used to
	240	create forgeries */
	241	if(sig->algor->parameter
	242	&& ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
	243	{
a291745e	244	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
b79aa05e MC	245	goto err;
	246	}
	247
1c80019a	248	sigtype=OBJ_obj2nid(sig->algor->algorithm);
d02b48c6	249
dfeab068	250
1c80019a	251	#ifdef RSA_DEBUG
657e60fa	252	/* put a backward compatibility flag in EAY */
1c80019a DSH	253	fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
	254	OBJ_nid2ln(dtype));
	255	#endif
	256	if (sigtype != dtype)
d02b48c6	257	{
1c80019a DSH	258	if (((dtype == NID_md5) &&
	259	(sigtype == NID_md5WithRSAEncryption)) \|\|
	260	((dtype == NID_md2) &&
	261	(sigtype == NID_md2WithRSAEncryption)))
	262	{
	263	/* ok, we will let it through */
6d23cf97	264	#if !defined(OPENSSL_NO_STDIO)
1c80019a	265	fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
cf1b7d96	266	#endif
1c80019a DSH	267	}
	268	else
	269	{
5c95c2ac	270	RSAerr(RSA_F_INT_RSA_VERIFY,
1c80019a DSH	271	RSA_R_ALGORITHM_MISMATCH);
	272	goto err;
	273	}
d02b48c6	274	}
b2a97be7 DSH	275	if (rm)
b2a97be7 DSH	276	{
75d44c04 DSH	277	const EVP_MD *md;
	278	md = EVP_get_digestbynid(dtype);
	279	if (md && (EVP_MD_size(md) != sig->digest->length))
5c95c2ac	280	RSAerr(RSA_F_INT_RSA_VERIFY,
75d44c04 DSH	281	RSA_R_INVALID_DIGEST_LENGTH);
	282	else
	283	{
	284	memcpy(rm, sig->digest->data,
	285	sig->digest->length);
	286	*prm_len = sig->digest->length;
	287	ret = 1;
	288	}
b2a97be7 DSH	289	}
b2a97be7 DSH	290	else if (((unsigned int)sig->digest->length != m_len) \|\|
1c80019a	291	(memcmp(m,sig->digest->data,m_len) != 0))
d02b48c6	292	{
5c95c2ac	293	RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
d02b48c6	294	}
1c80019a DSH	295	else
	296	ret=1;
	297	}
d02b48c6 RE	298	err:
d02b48c6 RE	299	if (sig != NULL) X509_SIG_free(sig);
a0e7c8ee DSH	300	if (s != NULL)
	301	{
	302	OPENSSL_cleanse(s,(unsigned int)siglen);
	303	OPENSSL_free(s);
	304	}
d02b48c6 RE	305	return(ret);
	306	}
	307
b2a97be7	308	int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
4f59b658	309	const unsigned char *sigbuf, unsigned int siglen,
b2a97be7 DSH	310	RSA *rsa)
	311	{
	312
	313	if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
	314	{
	315	return rsa->meth->rsa_verify(dtype, m, m_len,
	316	sigbuf, siglen, rsa);
	317	}
	318
	319	return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
	320	}