2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include "internal/cryptlib.h"
61 #include <openssl/dsa.h>
62 #include <openssl/asn1.h>
63 #include <openssl/asn1t.h>
64 #include <openssl/rand.h>
66 /* Override the default new methods */
67 static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
70 if (operation == ASN1_OP_NEW_PRE) {
72 sig = OPENSSL_malloc(sizeof(*sig));
74 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
79 *pval = (ASN1_VALUE *)sig;
85 ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {
86 ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
87 ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
88 } static_ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)
90 IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
92 /* Override the default free and new methods */
93 static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
96 if (operation == ASN1_OP_NEW_PRE) {
97 *pval = (ASN1_VALUE *)DSA_new();
101 } else if (operation == ASN1_OP_FREE_PRE) {
102 DSA_free((DSA *)*pval);
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, CBIGNUM)
116 } static_ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
118 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
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 } static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
126 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
128 ASN1_SEQUENCE_cb(DSAPublicKey, dsa_cb) = {
129 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
130 ASN1_SIMPLE(DSA, p, BIGNUM),
131 ASN1_SIMPLE(DSA, q, BIGNUM),
132 ASN1_SIMPLE(DSA, g, BIGNUM)
133 } static_ASN1_SEQUENCE_END_cb(DSA, DSAPublicKey)
135 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
137 DSA *DSAparams_dup(DSA *dsa)
139 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
142 int DSA_sign(int type, const unsigned char *dgst, int dlen,
143 unsigned char *sig, unsigned int *siglen, DSA *dsa)
146 RAND_seed(dgst, dlen);
147 s = DSA_do_sign(dgst, dlen, dsa);
152 *siglen = i2d_DSA_SIG(s, &sig);
157 /* data has already been hashed (probably with SHA or SHA-1). */
160 * 1: correct signature
161 * 0: incorrect signature
164 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
165 const unsigned char *sigbuf, int siglen, DSA *dsa)
168 const unsigned char *p = sigbuf;
169 unsigned char *der = NULL;
176 if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
178 /* Ensure signature uses DER and doesn't have trailing garbage */
179 derlen = i2d_DSA_SIG(s, &der);
180 if (derlen != siglen || memcmp(sigbuf, der, derlen))
182 ret = DSA_do_verify(dgst, dgst_len, s, dsa);
184 OPENSSL_clear_free(der, derlen);