220 lines
6.7 KiB
C
220 lines
6.7 KiB
C
/* dsa_asn1.c */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000 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/bn.h>
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#include <openssl/rand.h>
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#ifdef OPENSSL_FIPS
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#include <openssl/fips.h>
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#endif
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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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{
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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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sig->r = NULL;
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sig->s = NULL;
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*pval = (ASN1_VALUE *)sig;
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if(sig) return 2;
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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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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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{
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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) 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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/* DSA public key is a bit trickier... its effectively a CHOICE type
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* decided by a field called write_params which can either write out
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* just the public key as an INTEGER or the parameters and public key
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* 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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int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
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unsigned int *siglen, DSA *dsa)
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{
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DSA_SIG *s;
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#ifdef OPENSSL_FIPS
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if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
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{
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DSAerr(DSA_F_DSA_SIGN, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
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return 0;
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}
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#endif
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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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{
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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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int DSA_size(const DSA *r)
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{
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int ret,i;
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ASN1_INTEGER bs;
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unsigned char buf[4]; /* 4 bytes looks really small.
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However, i2d_ASN1_INTEGER() will not look
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beyond the first byte, as long as the second
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parameter is NULL. */
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i=BN_num_bits(r->q);
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bs.length=(i+7)/8;
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bs.data=buf;
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bs.type=V_ASN1_INTEGER;
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/* If the top bit is set the asn1 encoding is 1 larger. */
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buf[0]=0xff;
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i=i2d_ASN1_INTEGER(&bs,NULL);
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i+=i; /* r and s */
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ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
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return(ret);
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}
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/* data has already been hashed (probably with SHA or SHA-1). */
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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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int ret=-1;
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#ifdef OPENSSL_FIPS
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if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
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{
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DSAerr(DSA_F_DSA_VERIFY, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
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return 0;
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}
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#endif
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s = DSA_SIG_new();
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if (s == NULL) return(ret);
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if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err;
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ret=DSA_do_verify(dgst,dgst_len,s,dsa);
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err:
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DSA_SIG_free(s);
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return(ret);
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}
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