1 /* $OpenBSD: rsa_saos.c,v 1.25 2023/07/08 12:26:45 beck Exp $ */
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 <string.h>
61
62 #include <openssl/bn.h>
63 #include <openssl/err.h>
64 #include <openssl/objects.h>
65 #include <openssl/rsa.h>
66 #include <openssl/x509.h>
67
68 int
RSA_sign_ASN1_OCTET_STRING(int type,const unsigned char * m,unsigned int m_len,unsigned char * sigret,unsigned int * siglen,RSA * rsa)69 RSA_sign_ASN1_OCTET_STRING(int type, const unsigned char *m, unsigned int m_len,
70 unsigned char *sigret, unsigned int *siglen, RSA *rsa)
71 {
72 ASN1_OCTET_STRING sig;
73 int i, j, ret = 1;
74 unsigned char *p, *s;
75
76 sig.type = V_ASN1_OCTET_STRING;
77 sig.length = m_len;
78 sig.data = (unsigned char *)m;
79
80 i = i2d_ASN1_OCTET_STRING(&sig, NULL);
81 j = RSA_size(rsa);
82 if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
83 RSAerror(RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
84 return 0;
85 }
86 s = malloc(j + 1);
87 if (s == NULL) {
88 RSAerror(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 freezero(s, (unsigned int)j + 1);
100 return ret;
101 }
102 LCRYPTO_ALIAS(RSA_sign_ASN1_OCTET_STRING);
103
104 int
RSA_verify_ASN1_OCTET_STRING(int dtype,const unsigned char * m,unsigned int m_len,unsigned char * sigbuf,unsigned int siglen,RSA * rsa)105 RSA_verify_ASN1_OCTET_STRING(int dtype, const unsigned char *m,
106 unsigned int m_len, unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
107 {
108 int i, ret = 0;
109 unsigned char *s;
110 const unsigned char *p;
111 ASN1_OCTET_STRING *sig = NULL;
112
113 if (siglen != (unsigned int)RSA_size(rsa)) {
114 RSAerror(RSA_R_WRONG_SIGNATURE_LENGTH);
115 return 0;
116 }
117
118 s = malloc(siglen);
119 if (s == NULL) {
120 RSAerror(ERR_R_MALLOC_FAILURE);
121 goto err;
122 }
123 i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
124
125 if (i <= 0)
126 goto err;
127
128 p = s;
129 sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
130 if (sig == NULL)
131 goto err;
132
133 if ((unsigned int)sig->length != m_len ||
134 timingsafe_bcmp(m, sig->data, m_len) != 0) {
135 RSAerror(RSA_R_BAD_SIGNATURE);
136 } else
137 ret = 1;
138 err:
139 ASN1_OCTET_STRING_free(sig);
140 freezero(s, (unsigned int)siglen);
141 return ret;
142 }
143 LCRYPTO_ALIAS(RSA_verify_ASN1_OCTET_STRING);
144