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diff --git a/src/lib/libcrypto/rsa/rsa_sign.c b/src/lib/libcrypto/rsa/rsa_sign.c
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1/* $OpenBSD: rsa_sign.c,v 1.25 2015/09/10 15:56:25 jsing 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#include "rsa_locl.h"
69
70/* Size of an SSL signature: MD5+SHA1 */
71#define SSL_SIG_LENGTH 36
72
73int
74RSA_sign(int type, const unsigned char *m, unsigned int m_len,
75 unsigned char *sigret, unsigned int *siglen, RSA *rsa)
76{
77 X509_SIG sig;
78 ASN1_TYPE parameter;
79 int i, j, ret = 1;
80 unsigned char *p, *tmps = NULL;
81 const unsigned char *s = NULL;
82 X509_ALGOR algor;
83 ASN1_OCTET_STRING digest;
84
85 if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
86 return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
87
88 /* Special case: SSL signature, just check the length */
89 if (type == NID_md5_sha1) {
90 if (m_len != SSL_SIG_LENGTH) {
91 RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH);
92 return 0;
93 }
94 i = SSL_SIG_LENGTH;
95 s = m;
96 } else {
97 sig.algor = &algor;
98 sig.algor->algorithm = OBJ_nid2obj(type);
99 if (sig.algor->algorithm == NULL) {
100 RSAerr(RSA_F_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE);
101 return 0;
102 }
103 if (sig.algor->algorithm->length == 0) {
104 RSAerr(RSA_F_RSA_SIGN,
105 RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
106 return 0;
107 }
108 parameter.type = V_ASN1_NULL;
109 parameter.value.ptr = NULL;
110 sig.algor->parameter = &parameter;
111
112 sig.digest = &digest;
113 sig.digest->data = (unsigned char *)m; /* TMP UGLY CAST */
114 sig.digest->length = m_len;
115
116 i = i2d_X509_SIG(&sig, NULL);
117 }
118 j = RSA_size(rsa);
119 if (i > j - RSA_PKCS1_PADDING_SIZE) {
120 RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
121 return 0;
122 }
123 if (type != NID_md5_sha1) {
124 tmps = malloc(j + 1);
125 if (tmps == NULL) {
126 RSAerr(RSA_F_RSA_SIGN, ERR_R_MALLOC_FAILURE);
127 return 0;
128 }
129 p = tmps;
130 i2d_X509_SIG(&sig, &p);
131 s = tmps;
132 }
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
139 if (type != NID_md5_sha1) {
140 explicit_bzero(tmps, (unsigned int)j + 1);
141 free(tmps);
142 }
143 return (ret);
144}
145
146int
147int_rsa_verify(int dtype, const unsigned char *m, unsigned int m_len,
148 unsigned char *rm, size_t *prm_len, const unsigned char *sigbuf,
149 size_t siglen, RSA *rsa)
150{
151 int i, ret = 0, sigtype;
152 unsigned char *s;
153 X509_SIG *sig = NULL;
154
155 if (siglen != (unsigned int)RSA_size(rsa)) {
156 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH);
157 return 0;
158 }
159
160 if ((dtype == NID_md5_sha1) && rm) {
161 i = RSA_public_decrypt((int)siglen, sigbuf, rm, rsa,
162 RSA_PKCS1_PADDING);
163 if (i <= 0)
164 return 0;
165 *prm_len = i;
166 return 1;
167 }
168
169 s = malloc(siglen);
170 if (s == NULL) {
171 RSAerr(RSA_F_INT_RSA_VERIFY, ERR_R_MALLOC_FAILURE);
172 goto err;
173 }
174 if (dtype == NID_md5_sha1 && m_len != SSL_SIG_LENGTH) {
175 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH);
176 goto err;
177 }
178 i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
179
180 if (i <= 0)
181 goto err;
182
183 /* Special case: SSL signature */
184 if (dtype == NID_md5_sha1) {
185 if (i != SSL_SIG_LENGTH || memcmp(s, m, SSL_SIG_LENGTH))
186 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
187 else
188 ret = 1;
189 } else {
190 const unsigned char *p = s;
191
192 sig = d2i_X509_SIG(NULL, &p, (long)i);
193
194 if (sig == NULL)
195 goto err;
196
197 /* Excess data can be used to create forgeries */
198 if (p != s + i) {
199 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
200 goto err;
201 }
202
203 /* Parameters to the signature algorithm can also be used to
204 create forgeries */
205 if (sig->algor->parameter &&
206 ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) {
207 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
208 goto err;
209 }
210
211 sigtype = OBJ_obj2nid(sig->algor->algorithm);
212
213 if (sigtype != dtype) {
214 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH);
215 goto err;
216 }
217 if (rm) {
218 const EVP_MD *md;
219
220 md = EVP_get_digestbynid(dtype);
221 if (md && (EVP_MD_size(md) != sig->digest->length))
222 RSAerr(RSA_F_INT_RSA_VERIFY,
223 RSA_R_INVALID_DIGEST_LENGTH);
224 else {
225 memcpy(rm, sig->digest->data,
226 sig->digest->length);
227 *prm_len = sig->digest->length;
228 ret = 1;
229 }
230 } else if ((unsigned int)sig->digest->length != m_len ||
231 memcmp(m, sig->digest->data, m_len) != 0) {
232 RSAerr(RSA_F_INT_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
233 } else
234 ret = 1;
235 }
236err:
237 if (sig != NULL)
238 X509_SIG_free(sig);
239 if (s != NULL) {
240 explicit_bzero(s, (unsigned int)siglen);
241 free(s);
242 }
243 return ret;
244}
245
246int
247RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
248 const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
249{
250 if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
251 return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen,
252 rsa);
253
254 return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
255}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-25 08:43:45 +0000