rsa_saos.c revision 109998 
1/* crypto/rsa/rsa_saos.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 <openssl/bn.h>
62#include <openssl/rsa.h>
63#include <openssl/objects.h>
64#include <openssl/x509.h>
65
66int RSA_sign_ASN1_OCTET_STRING(int type,
67	const unsigned char *m, unsigned int m_len,
68	unsigned char *sigret, unsigned int *siglen, RSA *rsa)
69	{
70	ASN1_OCTET_STRING sig;
71	int i,j,ret=1;
72	unsigned char *p,*s;
73
74	sig.type=V_ASN1_OCTET_STRING;
75	sig.length=m_len;
76	sig.data=(unsigned char *)m;
77
78	i=i2d_ASN1_OCTET_STRING(&sig,NULL);
79	j=RSA_size(rsa);
80	if (i > (j-RSA_PKCS1_PADDING_SIZE))
81		{
82		RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
83		return(0);
84		}
85	s=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
86	if (s == NULL)
87		{
88		RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);
89		return(0);
90		}
91	p=s;
92	i2d_ASN1_OCTET_STRING(&sig,&p);
93	i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
94	if (i <= 0)
95		ret=0;
96	else
97		*siglen=i;
98
99	OPENSSL_cleanse(s,(unsigned int)j+1);
100	OPENSSL_free(s);
101	return(ret);
102	}
103
104int RSA_verify_ASN1_OCTET_STRING(int dtype,
105	const unsigned char *m,
106	unsigned int m_len, unsigned char *sigbuf, unsigned int siglen,
107	RSA *rsa)
108	{
109	int i,ret=0;
110	unsigned char *p,*s;
111	ASN1_OCTET_STRING *sig=NULL;
112
113	if (siglen != (unsigned int)RSA_size(rsa))
114		{
115		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_WRONG_SIGNATURE_LENGTH);
116		return(0);
117		}
118
119	s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
120	if (s == NULL)
121		{
122		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);
123		goto err;
124		}
125	i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
126
127	if (i <= 0) goto err;
128
129	p=s;
130	sig=d2i_ASN1_OCTET_STRING(NULL,&p,(long)i);
131	if (sig == NULL) goto err;
132
133	if (	((unsigned int)sig->length != m_len) ||
134		(memcmp(m,sig->data,m_len) != 0))
135		{
136		RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_BAD_SIGNATURE);
137		}
138	else
139		ret=1;
140err:
141	if (sig != NULL) M_ASN1_OCTET_STRING_free(sig);
142	OPENSSL_cleanse(s,(unsigned int)siglen);
143	OPENSSL_free(s);
144	return(ret);
145	}
146
147