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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 : 430 : static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
68 : : void *exarg)
69 : : {
70 [ + + ]: 430 : if(operation == ASN1_OP_NEW_PRE) {
71 : : DSA_SIG *sig;
72 : 86 : sig = OPENSSL_malloc(sizeof(DSA_SIG));
73 [ - + ]: 86 : if (!sig)
74 : : {
75 : 0 : DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
76 : 0 : return 0;
77 : : }
78 : 86 : sig->r = NULL;
79 : 86 : sig->s = NULL;
80 : 86 : *pval = (ASN1_VALUE *)sig;
81 : 86 : 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 : 516 : IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
92 : :
93 : : /* Override the default free and new methods */
94 : 345 : static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
95 : : void *exarg)
96 : : {
97 [ + + ]: 345 : if(operation == ASN1_OP_NEW_PRE) {
98 : 115 : *pval = (ASN1_VALUE *)DSA_new();
99 [ - + ]: 115 : if(*pval) return 2;
100 : 0 : return 0;
101 [ - + ]: 230 : } else if(operation == ASN1_OP_FREE_PRE) {
102 : 0 : DSA_free((DSA *)*pval);
103 : 0 : *pval = NULL;
104 : 0 : 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 : 0 : 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 : 230 : 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 : 0 : IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
147 : :
148 : 0 : DSA *DSAparams_dup(DSA *dsa)
149 : : {
150 : 0 : return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
151 : : }
152 : :
153 : 41 : 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 : 41 : RAND_seed(dgst, dlen);
158 : 41 : s=DSA_do_sign(dgst,dlen,dsa);
159 [ - + ]: 41 : if (s == NULL)
160 : : {
161 : 0 : *siglen=0;
162 : 0 : return(0);
163 : : }
164 : 41 : *siglen=i2d_DSA_SIG(s,&sig);
165 : 41 : DSA_SIG_free(s);
166 : 41 : 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 : 45 : 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 : 45 : int ret=-1;
180 : :
181 : 45 : s = DSA_SIG_new();
182 [ + - ]: 45 : if (s == NULL) return(ret);
183 [ + - ]: 45 : if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err;
184 : 45 : ret=DSA_do_verify(dgst,dgst_len,s,dsa);
185 : : err:
186 : 45 : DSA_SIG_free(s);
187 : 45 : return(ret);
188 : : }
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