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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 | #include <openssl/engine.h> | |
66 | ||
67 | /* Size of an SSL signature: MD5+SHA1 */ | |
68 | #define SSL_SIG_LENGTH 36 | |
69 | ||
70 | int RSA_sign(int type, const unsigned char *m, unsigned int m_len, | |
71 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) | |
72 | { | |
73 | X509_SIG sig; | |
74 | ASN1_TYPE parameter; | |
75 | int i,j,ret=1; | |
76 | unsigned char *p, *tmps = NULL; | |
77 | const unsigned char *s = NULL; | |
78 | X509_ALGOR algor; | |
79 | ASN1_OCTET_STRING digest; | |
80 | if((rsa->flags & RSA_FLAG_SIGN_VER) | |
81 | && ENGINE_get_RSA(rsa->engine)->rsa_sign) | |
82 | return ENGINE_get_RSA(rsa->engine)->rsa_sign(type, | |
83 | m, m_len, sigret, siglen, rsa); | |
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= ¶meter; | |
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 | memset(tmps,0,(unsigned int)j+1); | |
140 | OPENSSL_free(tmps); | |
141 | } | |
142 | return(ret); | |
143 | } | |
144 | ||
145 | int 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) | |
159 | && ENGINE_get_RSA(rsa->engine)->rsa_verify) | |
160 | return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype, | |
161 | m, m_len, sigbuf, siglen, rsa); | |
162 | ||
163 | s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); | |
164 | if (s == NULL) | |
165 | { | |
166 | RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); | |
167 | goto err; | |
168 | } | |
169 | if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { | |
170 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); | |
171 | return(0); | |
172 | } | |
173 | i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); | |
174 | ||
175 | if (i <= 0) goto err; | |
176 | ||
177 | /* Special case: SSL signature */ | |
178 | if(dtype == NID_md5_sha1) { | |
179 | if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH)) | |
180 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); | |
181 | else ret = 1; | |
182 | } else { | |
183 | p=s; | |
184 | sig=d2i_X509_SIG(NULL,&p,(long)i); | |
185 | ||
186 | if (sig == NULL) goto err; | |
187 | sigtype=OBJ_obj2nid(sig->algor->algorithm); | |
188 | ||
189 | ||
190 | #ifdef RSA_DEBUG | |
191 | /* put a backward compatibility flag in EAY */ | |
192 | fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), | |
193 | OBJ_nid2ln(dtype)); | |
194 | #endif | |
195 | if (sigtype != dtype) | |
196 | { | |
197 | if (((dtype == NID_md5) && | |
198 | (sigtype == NID_md5WithRSAEncryption)) || | |
199 | ((dtype == NID_md2) && | |
200 | (sigtype == NID_md2WithRSAEncryption))) | |
201 | { | |
202 | /* ok, we will let it through */ | |
203 | #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) | |
204 | fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); | |
205 | #endif | |
206 | } | |
207 | else | |
208 | { | |
209 | RSAerr(RSA_F_RSA_VERIFY, | |
210 | RSA_R_ALGORITHM_MISMATCH); | |
211 | goto err; | |
212 | } | |
213 | } | |
214 | if ( ((unsigned int)sig->digest->length != m_len) || | |
215 | (memcmp(m,sig->digest->data,m_len) != 0)) | |
216 | { | |
217 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); | |
218 | } | |
219 | else | |
220 | ret=1; | |
221 | } | |
222 | err: | |
223 | if (sig != NULL) X509_SIG_free(sig); | |
224 | memset(s,0,(unsigned int)siglen); | |
225 | OPENSSL_free(s); | |
226 | return(ret); | |
227 | } | |
228 |