rsa_saos.c revision 296465 
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,
69                               RSA *rsa)
70{
71    ASN1_OCTET_STRING sig;
72    int i, j, ret = 1;
73    unsigned char *p, *s;
74
75    sig.type = V_ASN1_OCTET_STRING;
76    sig.length = m_len;
77    sig.data = (unsigned char *)m;
78
79    i = i2d_ASN1_OCTET_STRING(&sig, NULL);
80    j = RSA_size(rsa);
81    if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
82        RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
83               RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
84        return (0);
85    }
86    s = (unsigned char *)OPENSSL_malloc((unsigned int)j + 1);
87    if (s == NULL) {
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,
107                                 unsigned int siglen, RSA *rsa)
108{
109    int i, ret = 0;
110    unsigned char *s;
111    const unsigned char *p;
112    ASN1_OCTET_STRING *sig = NULL;
113
114    if (siglen != (unsigned int)RSA_size(rsa)) {
115        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
116               RSA_R_WRONG_SIGNATURE_LENGTH);
117        return (0);
118    }
119
120    s = (unsigned char *)OPENSSL_malloc((unsigned int)siglen);
121    if (s == NULL) {
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)
128        goto err;
129
130    p = s;
131    sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
132    if (sig == NULL)
133        goto err;
134
135    if (((unsigned int)sig->length != m_len) ||
136        (memcmp(m, sig->data, m_len) != 0)) {
137        RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
138    } else
139        ret = 1;
140 err:
141    if (sig != NULL)
142        M_ASN1_OCTET_STRING_free(sig);
143    if (s != NULL) {
144        OPENSSL_cleanse(s, (unsigned int)siglen);
145        OPENSSL_free(s);
146    }
147    return (ret);
148}
149