3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
61 #include "internal/cryptlib.h"
62 #include <openssl/dsa.h>
63 #include <openssl/asn1.h>
64 #include <openssl/asn1t.h>
65 #include <openssl/rand.h>
67 /* Override the default new methods */
68 static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
71 if (operation == ASN1_OP_NEW_PRE) {
73 sig = OPENSSL_malloc(sizeof(*sig));
75 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
80 *pval = (ASN1_VALUE *)sig;
86 ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {
87 ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
88 ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
89 } static_ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)
91 IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
93 /* Override the default free and new methods */
94 static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
97 if (operation == ASN1_OP_NEW_PRE) {
98 *pval = (ASN1_VALUE *)DSA_new();
102 } else if (operation == ASN1_OP_FREE_PRE) {
103 DSA_free((DSA *)*pval);
110 ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
111 ASN1_SIMPLE(DSA, version, LONG),
112 ASN1_SIMPLE(DSA, p, BIGNUM),
113 ASN1_SIMPLE(DSA, q, BIGNUM),
114 ASN1_SIMPLE(DSA, g, BIGNUM),
115 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
116 ASN1_SIMPLE(DSA, priv_key, CBIGNUM)
117 } static_ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
119 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
121 ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
122 ASN1_SIMPLE(DSA, p, BIGNUM),
123 ASN1_SIMPLE(DSA, q, BIGNUM),
124 ASN1_SIMPLE(DSA, g, BIGNUM),
125 } static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
127 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
130 * DSA public key is a bit trickier... its effectively a CHOICE type decided
131 * by a field called write_params which can either write out just the public
132 * key as an INTEGER or the parameters and public key in a SEQUENCE
135 ASN1_SEQUENCE(DSAPublicKey) = {
136 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
137 ASN1_SIMPLE(DSA, p, BIGNUM),
138 ASN1_SIMPLE(DSA, q, BIGNUM),
139 ASN1_SIMPLE(DSA, g, BIGNUM)
140 } static_ASN1_SEQUENCE_END_name(DSA, DSAPublicKey)
142 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
144 DSA *DSAparams_dup(DSA *dsa)
146 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
149 int DSA_sign(int type, const unsigned char *dgst, int dlen,
150 unsigned char *sig, unsigned int *siglen, DSA *dsa)
153 RAND_seed(dgst, dlen);
154 s = DSA_do_sign(dgst, dlen, dsa);
159 *siglen = i2d_DSA_SIG(s, &sig);
164 /* data has already been hashed (probably with SHA or SHA-1). */
167 * 1: correct signature
168 * 0: incorrect signature
171 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
172 const unsigned char *sigbuf, int siglen, DSA *dsa)
175 const unsigned char *p = sigbuf;
176 unsigned char *der = NULL;
183 if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
185 /* Ensure signature uses DER and doesn't have trailing garbage */
186 derlen = i2d_DSA_SIG(s, &der);
187 if (derlen != siglen || memcmp(sigbuf, der, derlen))
189 ret = DSA_do_verify(dgst, dgst_len, s, dsa);
191 OPENSSL_clear_free(der, derlen);