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d02b48c6 | 1 | /* crypto/rsa/rsa_sign.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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" | |
ec577822 BM |
61 | #include <openssl/bn.h> |
62 | #include <openssl/rsa.h> | |
63 | #include <openssl/objects.h> | |
64 | #include <openssl/x509.h> | |
0b13e9f0 | 65 | #ifndef OPENSSL_NO_ENGINE |
5270e702 | 66 | #include <openssl/engine.h> |
0b13e9f0 | 67 | #endif |
d02b48c6 | 68 | |
1c80019a DSH |
69 | /* Size of an SSL signature: MD5+SHA1 */ |
70 | #define SSL_SIG_LENGTH 36 | |
71 | ||
29c1f061 | 72 | int RSA_sign(int type, const unsigned char *m, unsigned int m_len, |
6b691a5c | 73 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) |
d02b48c6 RE |
74 | { |
75 | X509_SIG sig; | |
76 | ASN1_TYPE parameter; | |
77 | int i,j,ret=1; | |
29c1f061 RL |
78 | unsigned char *p, *tmps = NULL; |
79 | const unsigned char *s = NULL; | |
d02b48c6 RE |
80 | X509_ALGOR algor; |
81 | ASN1_OCTET_STRING digest; | |
0b13e9f0 | 82 | #ifndef OPENSSL_NO_ENGINE |
f2a253e0 DSH |
83 | if((rsa->flags & RSA_FLAG_SIGN_VER) |
84 | && ENGINE_get_RSA(rsa->engine)->rsa_sign) | |
5270e702 RL |
85 | return ENGINE_get_RSA(rsa->engine)->rsa_sign(type, |
86 | m, m_len, sigret, siglen, rsa); | |
0b13e9f0 | 87 | #endif |
1c80019a DSH |
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); | |
d02b48c6 | 93 | } |
1c80019a DSH |
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 | { | |
101 | RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); | |
102 | return(0); | |
103 | } | |
104 | if (sig.algor->algorithm->length == 0) | |
105 | { | |
106 | RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); | |
107 | return(0); | |
108 | } | |
109 | parameter.type=V_ASN1_NULL; | |
110 | parameter.value.ptr=NULL; | |
111 | sig.algor->parameter= ¶meter; | |
d02b48c6 | 112 | |
1c80019a | 113 | sig.digest= &digest; |
29c1f061 | 114 | sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */ |
1c80019a | 115 | sig.digest->length=m_len; |
d02b48c6 | 116 | |
1c80019a DSH |
117 | i=i2d_X509_SIG(&sig,NULL); |
118 | } | |
d02b48c6 | 119 | j=RSA_size(rsa); |
ba8ad074 | 120 | if (i > (j-RSA_PKCS1_PADDING_SIZE)) |
d02b48c6 RE |
121 | { |
122 | RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); | |
123 | return(0); | |
124 | } | |
1c80019a | 125 | if(type != NID_md5_sha1) { |
29c1f061 RL |
126 | tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); |
127 | if (tmps == NULL) | |
1c80019a DSH |
128 | { |
129 | RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); | |
130 | return(0); | |
131 | } | |
29c1f061 | 132 | p=tmps; |
1c80019a | 133 | i2d_X509_SIG(&sig,&p); |
29c1f061 | 134 | s=tmps; |
1c80019a | 135 | } |
d02b48c6 RE |
136 | i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); |
137 | if (i <= 0) | |
138 | ret=0; | |
139 | else | |
140 | *siglen=i; | |
141 | ||
1c80019a | 142 | if(type != NID_md5_sha1) { |
4579924b | 143 | OPENSSL_cleanse(tmps,(unsigned int)j+1); |
29c1f061 | 144 | OPENSSL_free(tmps); |
1c80019a | 145 | } |
d02b48c6 RE |
146 | return(ret); |
147 | } | |
148 | ||
29c1f061 | 149 | int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, |
6b691a5c | 150 | unsigned char *sigbuf, unsigned int siglen, RSA *rsa) |
d02b48c6 RE |
151 | { |
152 | int i,ret=0,sigtype; | |
153 | unsigned char *p,*s; | |
154 | X509_SIG *sig=NULL; | |
155 | ||
156 | if (siglen != (unsigned int)RSA_size(rsa)) | |
157 | { | |
158 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); | |
159 | return(0); | |
160 | } | |
161 | ||
0b13e9f0 | 162 | #ifndef OPENSSL_NO_ENGINE |
f2a253e0 DSH |
163 | if((rsa->flags & RSA_FLAG_SIGN_VER) |
164 | && ENGINE_get_RSA(rsa->engine)->rsa_verify) | |
5270e702 RL |
165 | return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype, |
166 | m, m_len, sigbuf, siglen, rsa); | |
0b13e9f0 | 167 | #endif |
1c80019a | 168 | |
26a3a48d | 169 | s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); |
d02b48c6 RE |
170 | if (s == NULL) |
171 | { | |
172 | RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); | |
173 | goto err; | |
174 | } | |
1c80019a DSH |
175 | if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { |
176 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); | |
177 | return(0); | |
178 | } | |
d02b48c6 RE |
179 | i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); |
180 | ||
181 | if (i <= 0) goto err; | |
182 | ||
1c80019a DSH |
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_RSA_VERIFY,RSA_R_BAD_SIGNATURE); | |
187 | else ret = 1; | |
188 | } else { | |
189 | p=s; | |
190 | sig=d2i_X509_SIG(NULL,&p,(long)i); | |
dfeab068 | 191 | |
1c80019a DSH |
192 | if (sig == NULL) goto err; |
193 | sigtype=OBJ_obj2nid(sig->algor->algorithm); | |
d02b48c6 | 194 | |
dfeab068 | 195 | |
1c80019a | 196 | #ifdef RSA_DEBUG |
657e60fa | 197 | /* put a backward compatibility flag in EAY */ |
1c80019a DSH |
198 | fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), |
199 | OBJ_nid2ln(dtype)); | |
200 | #endif | |
201 | if (sigtype != dtype) | |
d02b48c6 | 202 | { |
1c80019a DSH |
203 | if (((dtype == NID_md5) && |
204 | (sigtype == NID_md5WithRSAEncryption)) || | |
205 | ((dtype == NID_md2) && | |
206 | (sigtype == NID_md2WithRSAEncryption))) | |
207 | { | |
208 | /* ok, we will let it through */ | |
bc36ee62 | 209 | #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) |
1c80019a | 210 | fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); |
cf1b7d96 | 211 | #endif |
1c80019a DSH |
212 | } |
213 | else | |
214 | { | |
215 | RSAerr(RSA_F_RSA_VERIFY, | |
216 | RSA_R_ALGORITHM_MISMATCH); | |
217 | goto err; | |
218 | } | |
d02b48c6 | 219 | } |
1c80019a DSH |
220 | if ( ((unsigned int)sig->digest->length != m_len) || |
221 | (memcmp(m,sig->digest->data,m_len) != 0)) | |
d02b48c6 | 222 | { |
1c80019a | 223 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); |
d02b48c6 | 224 | } |
1c80019a DSH |
225 | else |
226 | ret=1; | |
227 | } | |
d02b48c6 RE |
228 | err: |
229 | if (sig != NULL) X509_SIG_free(sig); | |
4579924b | 230 | OPENSSL_cleanse(s,(unsigned int)siglen); |
26a3a48d | 231 | OPENSSL_free(s); |
d02b48c6 RE |
232 | return(ret); |
233 | } | |
234 |