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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" | |
61 | #include "bn.h" | |
62 | #include "rsa.h" | |
63 | #include "objects.h" | |
64 | #include "x509.h" | |
65 | ||
6b691a5c UM |
66 | int RSA_sign(int type, unsigned char *m, unsigned int m_len, |
67 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) | |
d02b48c6 RE |
68 | { |
69 | X509_SIG sig; | |
70 | ASN1_TYPE parameter; | |
71 | int i,j,ret=1; | |
72 | unsigned char *p,*s; | |
73 | X509_ALGOR algor; | |
74 | ASN1_OCTET_STRING digest; | |
75 | ||
76 | sig.algor= &algor; | |
77 | sig.algor->algorithm=OBJ_nid2obj(type); | |
78 | if (sig.algor->algorithm == NULL) | |
79 | { | |
80 | RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); | |
81 | return(0); | |
82 | } | |
83 | if (sig.algor->algorithm->length == 0) | |
84 | { | |
85 | RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); | |
86 | return(0); | |
87 | } | |
88 | parameter.type=V_ASN1_NULL; | |
89 | parameter.value.ptr=NULL; | |
90 | sig.algor->parameter= ¶meter; | |
91 | ||
92 | sig.digest= &digest; | |
93 | sig.digest->data=m; | |
94 | sig.digest->length=m_len; | |
95 | ||
96 | i=i2d_X509_SIG(&sig,NULL); | |
97 | j=RSA_size(rsa); | |
98 | if ((i-RSA_PKCS1_PADDING) > j) | |
99 | { | |
100 | RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); | |
101 | return(0); | |
102 | } | |
103 | s=(unsigned char *)Malloc((unsigned int)j+1); | |
104 | if (s == NULL) | |
105 | { | |
106 | RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); | |
107 | return(0); | |
108 | } | |
109 | p=s; | |
110 | i2d_X509_SIG(&sig,&p); | |
111 | i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); | |
112 | if (i <= 0) | |
113 | ret=0; | |
114 | else | |
115 | *siglen=i; | |
116 | ||
117 | memset(s,0,(unsigned int)j+1); | |
118 | Free(s); | |
119 | return(ret); | |
120 | } | |
121 | ||
6b691a5c UM |
122 | int RSA_verify(int dtype, unsigned char *m, unsigned int m_len, |
123 | unsigned char *sigbuf, unsigned int siglen, RSA *rsa) | |
d02b48c6 RE |
124 | { |
125 | int i,ret=0,sigtype; | |
126 | unsigned char *p,*s; | |
127 | X509_SIG *sig=NULL; | |
128 | ||
129 | if (siglen != (unsigned int)RSA_size(rsa)) | |
130 | { | |
131 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); | |
132 | return(0); | |
133 | } | |
134 | ||
135 | s=(unsigned char *)Malloc((unsigned int)siglen); | |
136 | if (s == NULL) | |
137 | { | |
138 | RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); | |
139 | goto err; | |
140 | } | |
141 | i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); | |
142 | ||
143 | if (i <= 0) goto err; | |
144 | ||
145 | p=s; | |
146 | sig=d2i_X509_SIG(NULL,&p,(long)i); | |
dfeab068 | 147 | |
d02b48c6 RE |
148 | if (sig == NULL) goto err; |
149 | sigtype=OBJ_obj2nid(sig->algor->algorithm); | |
150 | ||
dfeab068 | 151 | |
d02b48c6 RE |
152 | #ifdef RSA_DEBUG |
153 | /* put a backward compatability flag in EAY */ | |
154 | fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), | |
155 | OBJ_nid2ln(dtype)); | |
156 | #endif | |
157 | if (sigtype != dtype) | |
158 | { | |
159 | if (((dtype == NID_md5) && | |
160 | (sigtype == NID_md5WithRSAEncryption)) || | |
161 | ((dtype == NID_md2) && | |
162 | (sigtype == NID_md2WithRSAEncryption))) | |
163 | { | |
164 | /* ok, we will let it through */ | |
58964a49 | 165 | #if !defined(NO_STDIO) && !defined(WIN16) |
d02b48c6 RE |
166 | fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); |
167 | #endif | |
168 | } | |
169 | else | |
170 | { | |
171 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_ALGORITHM_MISMATCH); | |
172 | goto err; | |
173 | } | |
174 | } | |
175 | if ( ((unsigned int)sig->digest->length != m_len) || | |
176 | (memcmp(m,sig->digest->data,m_len) != 0)) | |
177 | { | |
178 | RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); | |
179 | } | |
180 | else | |
181 | ret=1; | |
182 | err: | |
183 | if (sig != NULL) X509_SIG_free(sig); | |
184 | memset(s,0,(unsigned int)siglen); | |
185 | Free(s); | |
186 | return(ret); | |
187 | } | |
188 |