202 lines
6.6 KiB
C
202 lines
6.6 KiB
C
/* dsa_asn1.c */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/dsa.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/rand.h>
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/* Override the default new methods */
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static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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void *exarg)
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{
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if (operation == ASN1_OP_NEW_PRE) {
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DSA_SIG *sig;
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sig = OPENSSL_malloc(sizeof(DSA_SIG));
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if (!sig) {
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DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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sig->r = NULL;
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sig->s = NULL;
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*pval = (ASN1_VALUE *)sig;
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return 2;
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}
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return 1;
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}
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ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {
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ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
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ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
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} ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG, DSA_SIG, DSA_SIG)
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/* Override the default free and new methods */
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static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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void *exarg)
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{
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if (operation == ASN1_OP_NEW_PRE) {
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*pval = (ASN1_VALUE *)DSA_new();
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if (*pval)
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return 2;
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return 0;
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} else if (operation == ASN1_OP_FREE_PRE) {
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DSA_free((DSA *)*pval);
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*pval = NULL;
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return 2;
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}
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return 1;
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}
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ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
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ASN1_SIMPLE(DSA, version, LONG),
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ASN1_SIMPLE(DSA, p, BIGNUM),
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ASN1_SIMPLE(DSA, q, BIGNUM),
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ASN1_SIMPLE(DSA, g, BIGNUM),
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ASN1_SIMPLE(DSA, pub_key, BIGNUM),
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ASN1_SIMPLE(DSA, priv_key, BIGNUM)
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} ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
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ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
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ASN1_SIMPLE(DSA, p, BIGNUM),
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ASN1_SIMPLE(DSA, q, BIGNUM),
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ASN1_SIMPLE(DSA, g, BIGNUM),
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} ASN1_SEQUENCE_END_cb(DSA, DSAparams)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
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/*
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* DSA public key is a bit trickier... its effectively a CHOICE type decided
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* by a field called write_params which can either write out just the public
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* key as an INTEGER or the parameters and public key in a SEQUENCE
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*/
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ASN1_SEQUENCE(dsa_pub_internal) = {
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ASN1_SIMPLE(DSA, pub_key, BIGNUM),
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ASN1_SIMPLE(DSA, p, BIGNUM),
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ASN1_SIMPLE(DSA, q, BIGNUM),
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ASN1_SIMPLE(DSA, g, BIGNUM)
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} ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal)
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ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = {
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ASN1_SIMPLE(DSA, pub_key, BIGNUM),
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ASN1_EX_COMBINE(0, 0, dsa_pub_internal)
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} ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
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DSA *DSAparams_dup(DSA *dsa)
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{
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return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
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}
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int DSA_sign(int type, const unsigned char *dgst, int dlen,
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unsigned char *sig, unsigned int *siglen, DSA *dsa)
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{
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DSA_SIG *s;
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RAND_seed(dgst, dlen);
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s = DSA_do_sign(dgst, dlen, dsa);
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if (s == NULL) {
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*siglen = 0;
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return (0);
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}
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*siglen = i2d_DSA_SIG(s, &sig);
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DSA_SIG_free(s);
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return (1);
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}
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/* data has already been hashed (probably with SHA or SHA-1). */
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/*-
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* returns
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* 1: correct signature
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* 0: incorrect signature
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* -1: error
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*/
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int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
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const unsigned char *sigbuf, int siglen, DSA *dsa)
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{
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DSA_SIG *s;
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const unsigned char *p = sigbuf;
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unsigned char *der = NULL;
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int derlen = -1;
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int ret = -1;
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s = DSA_SIG_new();
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if (s == NULL)
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return (ret);
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if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
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goto err;
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/* Ensure signature uses DER and doesn't have trailing garbage */
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derlen = i2d_DSA_SIG(s, &der);
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if (derlen != siglen || memcmp(sigbuf, der, derlen))
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goto err;
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ret = DSA_do_verify(dgst, dgst_len, s, dsa);
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err:
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if (derlen > 0) {
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OPENSSL_cleanse(der, derlen);
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OPENSSL_free(der);
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}
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DSA_SIG_free(s);
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return (ret);
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}
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