1 /* dsa_asn1.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/dsa.h>
62 #include <openssl/asn1.h>
63 #include <openssl/asn1t.h>
64 #include <openssl/rand.h>
65
66 /* Override the default new methods */
67 static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
68 void *exarg)
69 {
70 if(operation == ASN1_OP_NEW_PRE) {
71 DSA_SIG *sig;
72 sig = OPENSSL_malloc(sizeof(DSA_SIG));
73 if (!sig)
74 {
75 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
76 return 0;
77 }
78 sig->r = NULL;
79 sig->s = NULL;
80 *pval = (ASN1_VALUE *)sig;
81 return 2;
82 }
83 return 1;
84 }
85
86 ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {
87 ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
88 ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
89 } ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)
90
91 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG, DSA_SIG, DSA_SIG)
92
93 /* Override the default free and new methods */
94 static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
95 void *exarg)
96 {
97 if(operation == ASN1_OP_NEW_PRE) {
98 *pval = (ASN1_VALUE *)DSA_new();
99 if(*pval) return 2;
100 return 0;
101 } else if(operation == ASN1_OP_FREE_PRE) {
102 DSA_free((DSA *)*pval);
103 *pval = NULL;
104 return 2;
105 }
106 return 1;
107 }
108
109 ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
110 ASN1_SIMPLE(DSA, version, LONG),
111 ASN1_SIMPLE(DSA, p, BIGNUM),
112 ASN1_SIMPLE(DSA, q, BIGNUM),
113 ASN1_SIMPLE(DSA, g, BIGNUM),
114 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
115 ASN1_SIMPLE(DSA, priv_key, BIGNUM)
116 } ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
117
118 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
119
120 ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
121 ASN1_SIMPLE(DSA, p, BIGNUM),
122 ASN1_SIMPLE(DSA, q, BIGNUM),
123 ASN1_SIMPLE(DSA, g, BIGNUM),
124 } ASN1_SEQUENCE_END_cb(DSA, DSAparams)
125
126 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
127
128 /* DSA public key is a bit trickier... its effectively a CHOICE type
129 * decided by a field called write_params which can either write out
130 * just the public key as an INTEGER or the parameters and public key
131 * in a SEQUENCE
132 */
133
134 ASN1_SEQUENCE(dsa_pub_internal) = {
135 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
136 ASN1_SIMPLE(DSA, p, BIGNUM),
137 ASN1_SIMPLE(DSA, q, BIGNUM),
138 ASN1_SIMPLE(DSA, g, BIGNUM)
139 } ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal)
140
141 ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = {
142 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
143 ASN1_EX_COMBINE(0, 0, dsa_pub_internal)
144 } ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params)
145
146 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
147
148 DSA *DSAparams_dup(DSA *dsa)
149 {
150 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
151 }
152
153 int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
154 unsigned int *siglen, DSA *dsa)
155 {
156 DSA_SIG *s;
157 RAND_seed(dgst, dlen);
158 s=DSA_do_sign(dgst,dlen,dsa);
159 if (s == NULL)
160 {
161 *siglen=0;
162 return(0);
163 }
164 *siglen=i2d_DSA_SIG(s,&sig);
165 DSA_SIG_free(s);
166 return(1);
167 }
168
169 /* data has already been hashed (probably with SHA or SHA-1). */
170 /* returns
171 * 1: correct signature
172 * 0: incorrect signature
173 * -1: error
174 */
175 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
176 const unsigned char *sigbuf, int siglen, DSA *dsa)
177 {
178 DSA_SIG *s;
179 int ret=-1;
180
181 s = DSA_SIG_new();
182 if (s == NULL) return(ret);
183 if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err;
184 ret=DSA_do_verify(dgst,dgst_len,s,dsa);
185 err:
186 DSA_SIG_free(s);
187 return(ret);
188 }