[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 "bn.h"
#include "rsa.h"
#include "objects.h"
#include "x509.h"

int RSA_sign(type,m,m_len,sigret,siglen,rsa)
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;
	X509_ALGOR algor;
	ASN1_OCTET_STRING digest;

	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);
		}
	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;

	memset(s,0,(unsigned int)j+1);
	Free(s);
	return(ret);
	}

int RSA_verify(dtype, m, m_len, sigbuf, siglen, rsa)
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);
		}

	s=(unsigned char *)Malloc((unsigned int)siglen);
	if (s == NULL)
		{
		RSAerr(RSA_F_RSA_VERIFY,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_X509_SIG(NULL,&p,(long)i);
	if (sig == NULL) goto err;
	sigtype=OBJ_obj2nid(sig->algor->algorithm);

#ifdef RSA_DEBUG
	/* put a backward compatability 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"
	61	#include "bn.h"
	62	#include "rsa.h"
	63	#include "objects.h"
	64	#include "x509.h"
	65
	66	int RSA_sign(type,m,m_len,sigret,siglen,rsa)
67	int type;
68	unsigned char *m;
69	unsigned int m_len;
70	unsigned char *sigret;
71	unsigned int *siglen;
72	RSA *rsa;
73	{
74	X509_SIG sig;
75	ASN1_TYPE parameter;
76	int i,j,ret=1;
77	unsigned char p,s;
78	X509_ALGOR algor;
79	ASN1_OCTET_STRING digest;
80
81	sig.algor= &algor;
82	sig.algor->algorithm=OBJ_nid2obj(type);
83	if (sig.algor->algorithm == NULL)
84	{
85	RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
86	return(0);
87	}
88	if (sig.algor->algorithm->length == 0)
89	{
90	RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
91	return(0);
92	}
93	parameter.type=V_ASN1_NULL;
94	parameter.value.ptr=NULL;
95	sig.algor->parameter= &parameter;
96
97	sig.digest= &digest;
98	sig.digest->data=m;
99	sig.digest->length=m_len;
100
101	i=i2d_X509_SIG(&sig,NULL);
102	j=RSA_size(rsa);
103	if ((i-RSA_PKCS1_PADDING) > j)
104	{
105	RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
106	return(0);
107	}
108	s=(unsigned char *)Malloc((unsigned int)j+1);
109	if (s == NULL)
110	{
111	RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
112	return(0);
113	}
114	p=s;
115	i2d_X509_SIG(&sig,&p);
116	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
117	if (i <= 0)
118	ret=0;
119	else
120	*siglen=i;
121
122	memset(s,0,(unsigned int)j+1);
123	Free(s);
124	return(ret);
125	}
126
127	int RSA_verify(dtype, m, m_len, sigbuf, siglen, rsa)
128	int dtype;
129	unsigned char *m;
130	unsigned int m_len;
131	unsigned char *sigbuf;
132	unsigned int siglen;
133	RSA *rsa;
134	{
135	int i,ret=0,sigtype;
136	unsigned char p,s;
137	X509_SIG *sig=NULL;
138
139	if (siglen != (unsigned int)RSA_size(rsa))
140	{
141	RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
142	return(0);
143	}
144
145	s=(unsigned char *)Malloc((unsigned int)siglen);
146	if (s == NULL)
147	{
148	RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
149	goto err;
150	}
151	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
152
153	if (i <= 0) goto err;
154
155	p=s;
156	sig=d2i_X509_SIG(NULL,&p,(long)i);
157	if (sig == NULL) goto err;
158	sigtype=OBJ_obj2nid(sig->algor->algorithm);
159
160	#ifdef RSA_DEBUG
161	/* put a backward compatability flag in EAY */
162	fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
163	OBJ_nid2ln(dtype));
164	#endif
165	if (sigtype != dtype)
166	{
167	if (((dtype == NID_md5) &&
168	(sigtype == NID_md5WithRSAEncryption)) \|\|
169	((dtype == NID_md2) &&
170	(sigtype == NID_md2WithRSAEncryption)))
171	{
172	/* ok, we will let it through */
58964a49	173	#if !defined(NO_STDIO) && !defined(WIN16)
d02b48c6 RE	174	fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
	175	#endif
	176	}
	177	else
	178	{
	179	RSAerr(RSA_F_RSA_VERIFY,RSA_R_ALGORITHM_MISMATCH);
	180	goto err;
	181	}
	182	}
	183	if ( ((unsigned int)sig->digest->length != m_len) \|\|
	184	(memcmp(m,sig->digest->data,m_len) != 0))
	185	{
	186	RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
	187	}
	188	else
	189	ret=1;
	190	err:
	191	if (sig != NULL) X509_SIG_free(sig);
	192	memset(s,0,(unsigned int)siglen);
	193	Free(s);
	194	return(ret);
	195	}
	196