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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/* crypto/rsa/rsa_sign.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
66/* Size of an SSL signature: MD5+SHA1 */
67#define SSL_SIG_LENGTH 36
68
69int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
70 unsigned char *sigret, unsigned int *siglen, RSA *rsa)
71 {
72 X509_SIG sig;
73 ASN1_TYPE parameter;
74 int i,j,ret=1;
75 unsigned char *p, *tmps = NULL;
76 const unsigned char *s = NULL;
77 X509_ALGOR algor;
78 ASN1_OCTET_STRING digest;
79 if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
80 {
81 return rsa->meth->rsa_sign(type, m, m_len,
82 sigret, siglen, rsa);
83 }
84 /* Special case: SSL signature, just check the length */
85 if(type == NID_md5_sha1) {
86 if(m_len != SSL_SIG_LENGTH) {
87 RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
88 return(0);
89 }
90 i = SSL_SIG_LENGTH;
91 s = m;
92 } else {
93 sig.algor= &algor;
94 sig.algor->algorithm=OBJ_nid2obj(type);
95 if (sig.algor->algorithm == NULL)
96 {
97 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
98 return(0);
99 }
100 if (sig.algor->algorithm->length == 0)
101 {
102 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
103 return(0);
104 }
105 parameter.type=V_ASN1_NULL;
106 parameter.value.ptr=NULL;
107 sig.algor->parameter= &parameter;
108
109 sig.digest= &digest;
110 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
111 sig.digest->length=m_len;
112
113 i=i2d_X509_SIG(&sig,NULL);
114 }
115 j=RSA_size(rsa);
116 if (i > (j-RSA_PKCS1_PADDING_SIZE))
117 {
118 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
119 return(0);
120 }
121 if(type != NID_md5_sha1) {
122 tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
123 if (tmps == NULL)
124 {
125 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
126 return(0);
127 }
128 p=tmps;
129 i2d_X509_SIG(&sig,&p);
130 s=tmps;
131 }
132 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
133 if (i <= 0)
134 ret=0;
135 else
136 *siglen=i;
137
138 if(type != NID_md5_sha1) {
139 OPENSSL_cleanse(tmps,(unsigned int)j+1);
140 OPENSSL_free(tmps);
141 }
142 return(ret);
143 }
144
145int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
146 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
147 {
148 int i,ret=0,sigtype;
149 unsigned char *p,*s;
150 X509_SIG *sig=NULL;
151
152 if (siglen != (unsigned int)RSA_size(rsa))
153 {
154 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
155 return(0);
156 }
157
158 if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
159 {
160 return rsa->meth->rsa_verify(dtype, m, m_len,
161 sigbuf, siglen, rsa);
162 }
163
164 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
165 if (s == NULL)
166 {
167 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
168 goto err;
169 }
170 if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
171 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
172 goto err;
173 }
174 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
175
176 if (i <= 0) goto err;
177
178 /* Special case: SSL signature */
179 if(dtype == NID_md5_sha1) {
180 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
181 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
182 else ret = 1;
183 } else {
184 p=s;
185 sig=d2i_X509_SIG(NULL,&p,(long)i);
186
187 if (sig == NULL) goto err;
188
189 /* Excess data can be used to create forgeries */
190 if(p != s+i)
191 {
192 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
193 goto err;
194 }
195
196 /* Parameters to the signature algorithm can also be used to
197 create forgeries */
198 if(sig->algor->parameter
199 && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
200 {
201 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
202 goto err;
203 }
204
205 sigtype=OBJ_obj2nid(sig->algor->algorithm);
206
207
208 #ifdef RSA_DEBUG
209 /* put a backward compatibility flag in EAY */
210 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
211 OBJ_nid2ln(dtype));
212 #endif
213 if (sigtype != dtype)
214 {
215 if (((dtype == NID_md5) &&
216 (sigtype == NID_md5WithRSAEncryption)) ||
217 ((dtype == NID_md2) &&
218 (sigtype == NID_md2WithRSAEncryption)))
219 {
220 /* ok, we will let it through */
221#if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
222 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
223#endif
224 }
225 else
226 {
227 RSAerr(RSA_F_RSA_VERIFY,
228 RSA_R_ALGORITHM_MISMATCH);
229 goto err;
230 }
231 }
232 if ( ((unsigned int)sig->digest->length != m_len) ||
233 (memcmp(m,sig->digest->data,m_len) != 0))
234 {
235 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
236 }
237 else
238 ret=1;
239 }
240err:
241 if (sig != NULL) X509_SIG_free(sig);
242 if (s != NULL)
243 {
244 OPENSSL_cleanse(s,(unsigned int)siglen);
245 OPENSSL_free(s);
246 }
247 return(ret);
248 }
249
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