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diff --git a/src/lib/libcrypto/dsa/dsa_asn1.c b/src/lib/libcrypto/dsa/dsa_asn1.c
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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 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/bn.h>
65#ifdef OPENSSL_FIPS
66#include <openssl/fips.h>
67#endif
68
69
70/* Override the default new methods */
71static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
72{
73 if(operation == ASN1_OP_NEW_PRE) {
74 DSA_SIG *sig;
75 sig = OPENSSL_malloc(sizeof(DSA_SIG));
76 sig->r = NULL;
77 sig->s = NULL;
78 *pval = (ASN1_VALUE *)sig;
79 if(sig) return 2;
80 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
81 return 0;
82 }
83 return 1;
84}
85
86ASN1_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
91IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG,DSA_SIG,DSA_SIG)
92
93/* Override the default free and new methods */
94static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
95{
96 if(operation == ASN1_OP_NEW_PRE) {
97 *pval = (ASN1_VALUE *)DSA_new();
98 if(*pval) return 2;
99 return 0;
100 } else if(operation == ASN1_OP_FREE_PRE) {
101 DSA_free((DSA *)*pval);
102 *pval = NULL;
103 return 2;
104 }
105 return 1;
106}
107
108ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
109 ASN1_SIMPLE(DSA, version, LONG),
110 ASN1_SIMPLE(DSA, p, BIGNUM),
111 ASN1_SIMPLE(DSA, q, BIGNUM),
112 ASN1_SIMPLE(DSA, g, BIGNUM),
113 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
114 ASN1_SIMPLE(DSA, priv_key, BIGNUM)
115} ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
116
117IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
118
119ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
120 ASN1_SIMPLE(DSA, p, BIGNUM),
121 ASN1_SIMPLE(DSA, q, BIGNUM),
122 ASN1_SIMPLE(DSA, g, BIGNUM),
123} ASN1_SEQUENCE_END_cb(DSA, DSAparams)
124
125IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
126
127/* DSA public key is a bit trickier... its effectively a CHOICE type
128 * decided by a field called write_params which can either write out
129 * just the public key as an INTEGER or the parameters and public key
130 * in a SEQUENCE
131 */
132
133ASN1_SEQUENCE(dsa_pub_internal) = {
134 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
135 ASN1_SIMPLE(DSA, p, BIGNUM),
136 ASN1_SIMPLE(DSA, q, BIGNUM),
137 ASN1_SIMPLE(DSA, g, BIGNUM)
138} ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal)
139
140ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = {
141 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
142 ASN1_EX_COMBINE(0, 0, dsa_pub_internal)
143} ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params)
144
145IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
146
147int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
148 unsigned int *siglen, DSA *dsa)
149 {
150 DSA_SIG *s;
151#ifdef OPENSSL_FIPS
152 if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
153 {
154 DSAerr(DSA_F_DSA_SIGN, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
155 return 0;
156 }
157#endif
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
169int DSA_size(const DSA *r)
170 {
171 int ret,i;
172 ASN1_INTEGER bs;
173 unsigned char buf[4]; /* 4 bytes looks really small.
174 However, i2d_ASN1_INTEGER() will not look
175 beyond the first byte, as long as the second
176 parameter is NULL. */
177
178 i=BN_num_bits(r->q);
179 bs.length=(i+7)/8;
180 bs.data=buf;
181 bs.type=V_ASN1_INTEGER;
182 /* If the top bit is set the asn1 encoding is 1 larger. */
183 buf[0]=0xff;
184
185 i=i2d_ASN1_INTEGER(&bs,NULL);
186 i+=i; /* r and s */
187 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
188 return(ret);
189 }
190
191/* data has already been hashed (probably with SHA or SHA-1). */
192/* returns
193 * 1: correct signature
194 * 0: incorrect signature
195 * -1: error
196 */
197int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
198 const unsigned char *sigbuf, int siglen, DSA *dsa)
199 {
200 DSA_SIG *s;
201 int ret=-1;
202#ifdef OPENSSL_FIPS
203 if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
204 {
205 DSAerr(DSA_F_DSA_VERIFY, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
206 return 0;
207 }
208#endif
209
210 s = DSA_SIG_new();
211 if (s == NULL) return(ret);
212 if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err;
213 ret=DSA_do_verify(dgst,dgst_len,s,dsa);
214err:
215 DSA_SIG_free(s);
216 return(ret);
217 }
218
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