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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 /* NB: in FIPS mode block anything that isn't a TLS signature */
94#ifdef OPENSSL_FIPS
95 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
96 {
97 RSAerr(RSA_F_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
98 return 0;
99 }
100#endif
101 sig.algor= &algor;
102 sig.algor->algorithm=OBJ_nid2obj(type);
103 if (sig.algor->algorithm == NULL)
104 {
105 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
106 return(0);
107 }
108 if (sig.algor->algorithm->length == 0)
109 {
110 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
111 return(0);
112 }
113 parameter.type=V_ASN1_NULL;
114 parameter.value.ptr=NULL;
115 sig.algor->parameter= &parameter;
116
117 sig.digest= &digest;
118 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
119 sig.digest->length=m_len;
120
121 i=i2d_X509_SIG(&sig,NULL);
122 }
123 j=RSA_size(rsa);
124 if (i > (j-RSA_PKCS1_PADDING_SIZE))
125 {
126 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
127 return(0);
128 }
129 if(type != NID_md5_sha1) {
130 tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
131 if (tmps == NULL)
132 {
133 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
134 return(0);
135 }
136 p=tmps;
137 i2d_X509_SIG(&sig,&p);
138 s=tmps;
139 }
140 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
141 if (i <= 0)
142 ret=0;
143 else
144 *siglen=i;
145
146 if(type != NID_md5_sha1) {
147 OPENSSL_cleanse(tmps,(unsigned int)j+1);
148 OPENSSL_free(tmps);
149 }
150 return(ret);
151 }
152
153int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
154 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
155 {
156 int i,ret=0,sigtype;
157 unsigned char *s;
158 X509_SIG *sig=NULL;
159
160 if (siglen != (unsigned int)RSA_size(rsa))
161 {
162 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
163 return(0);
164 }
165
166 if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
167 {
168 return rsa->meth->rsa_verify(dtype, m, m_len,
169 sigbuf, siglen, rsa);
170 }
171
172 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
173 if (s == NULL)
174 {
175 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
176 goto err;
177 }
178 if(dtype == NID_md5_sha1)
179 {
180 if (m_len != SSL_SIG_LENGTH)
181 {
182 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
183 goto err;
184 }
185 }
186 /* NB: in FIPS mode block anything that isn't a TLS signature */
187#ifdef OPENSSL_FIPS
188 else if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
189 {
190 RSAerr(RSA_F_RSA_VERIFY, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
191 return 0;
192 }
193#endif
194 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
195
196 if (i <= 0) goto err;
197
198 /* Special case: SSL signature */
199 if(dtype == NID_md5_sha1) {
200 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
201 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
202 else ret = 1;
203 } else {
204 const unsigned char *p=s;
205 sig=d2i_X509_SIG(NULL,&p,(long)i);
206
207 if (sig == NULL) goto err;
208
209 /* Excess data can be used to create forgeries */
210 if(p != s+i)
211 {
212 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
213 goto err;
214 }
215
216 /* Parameters to the signature algorithm can also be used to
217 create forgeries */
218 if(sig->algor->parameter
219 && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
220 {
221 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
222 goto err;
223 }
224
225 sigtype=OBJ_obj2nid(sig->algor->algorithm);
226
227
228 #ifdef RSA_DEBUG
229 /* put a backward compatibility flag in EAY */
230 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
231 OBJ_nid2ln(dtype));
232 #endif
233 if (sigtype != dtype)
234 {
235 if (((dtype == NID_md5) &&
236 (sigtype == NID_md5WithRSAEncryption)) ||
237 ((dtype == NID_md2) &&
238 (sigtype == NID_md2WithRSAEncryption)))
239 {
240 /* ok, we will let it through */
241#if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
242 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
243#endif
244 }
245 else
246 {
247 RSAerr(RSA_F_RSA_VERIFY,
248 RSA_R_ALGORITHM_MISMATCH);
249 goto err;
250 }
251 }
252 if ( ((unsigned int)sig->digest->length != m_len) ||
253 (memcmp(m,sig->digest->data,m_len) != 0))
254 {
255 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
256 }
257 else
258 ret=1;
259 }
260err:
261 if (sig != NULL) X509_SIG_free(sig);
262 if (s != NULL)
263 {
264 OPENSSL_cleanse(s,(unsigned int)siglen);
265 OPENSSL_free(s);
266 }
267 return(ret);
268 }
269
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