387 lines
8.9 KiB
C
387 lines
8.9 KiB
C
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/* $OpenBSD: dsa_lib.c,v 1.29 2018/04/14 07:09:21 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
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#include <stdio.h>
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#include <openssl/opensslconf.h>
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#include <openssl/asn1.h>
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/err.h>
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#ifndef OPENSSL_NO_DH
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#include <openssl/dh.h>
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#endif
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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static const DSA_METHOD *default_DSA_method = NULL;
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void
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DSA_set_default_method(const DSA_METHOD *meth)
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{
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default_DSA_method = meth;
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}
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const DSA_METHOD *
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DSA_get_default_method(void)
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{
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if (!default_DSA_method)
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default_DSA_method = DSA_OpenSSL();
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return default_DSA_method;
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}
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DSA *
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DSA_new(void)
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{
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return DSA_new_method(NULL);
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}
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int
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DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
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{
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/*
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* NB: The caller is specifically setting a method, so it's not up to us
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* to deal with which ENGINE it comes from.
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*/
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const DSA_METHOD *mtmp;
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mtmp = dsa->meth;
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if (mtmp->finish)
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mtmp->finish(dsa);
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(dsa->engine);
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dsa->engine = NULL;
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#endif
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dsa->meth = meth;
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if (meth->init)
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meth->init(dsa);
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return 1;
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}
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DSA *
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DSA_new_method(ENGINE *engine)
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{
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DSA *ret;
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ret = malloc(sizeof(DSA));
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if (ret == NULL) {
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DSAerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->meth = DSA_get_default_method();
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#ifndef OPENSSL_NO_ENGINE
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if (engine) {
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if (!ENGINE_init(engine)) {
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DSAerror(ERR_R_ENGINE_LIB);
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free(ret);
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return NULL;
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}
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ret->engine = engine;
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} else
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ret->engine = ENGINE_get_default_DSA();
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if (ret->engine) {
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ret->meth = ENGINE_get_DSA(ret->engine);
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if (ret->meth == NULL) {
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DSAerror(ERR_R_ENGINE_LIB);
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ENGINE_finish(ret->engine);
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free(ret);
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return NULL;
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}
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}
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#endif
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ret->pad = 0;
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ret->version = 0;
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ret->write_params = 1;
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ret->p = NULL;
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ret->q = NULL;
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ret->g = NULL;
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ret->pub_key = NULL;
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ret->priv_key = NULL;
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ret->kinv = NULL;
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ret->r = NULL;
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ret->method_mont_p = NULL;
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ret->references = 1;
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ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
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CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
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if (ret->meth->init != NULL && !ret->meth->init(ret)) {
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(ret->engine);
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#endif
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
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free(ret);
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ret = NULL;
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}
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return ret;
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}
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void
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DSA_free(DSA *r)
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{
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int i;
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if (r == NULL)
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return;
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i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
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if (i > 0)
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return;
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if (r->meth->finish)
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r->meth->finish(r);
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(r->engine);
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#endif
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
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BN_clear_free(r->p);
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BN_clear_free(r->q);
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BN_clear_free(r->g);
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BN_clear_free(r->pub_key);
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BN_clear_free(r->priv_key);
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BN_clear_free(r->kinv);
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BN_clear_free(r->r);
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free(r);
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}
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int
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DSA_up_ref(DSA *r)
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{
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int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
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return i > 1 ? 1 : 0;
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}
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int
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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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int
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DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
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CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
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{
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return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
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new_func, dup_func, free_func);
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}
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int
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DSA_set_ex_data(DSA *d, int idx, void *arg)
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{
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return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
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}
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void *
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DSA_get_ex_data(DSA *d, int idx)
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{
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return CRYPTO_get_ex_data(&d->ex_data, idx);
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}
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#ifndef OPENSSL_NO_DH
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DH *
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DSA_dup_DH(const DSA *r)
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{
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/*
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* DSA has p, q, g, optional pub_key, optional priv_key.
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* DH has p, optional length, g, optional pub_key, optional priv_key,
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* optional q.
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*/
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DH *ret = NULL;
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if (r == NULL)
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goto err;
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ret = DH_new();
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if (ret == NULL)
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goto err;
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if (r->p != NULL)
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if ((ret->p = BN_dup(r->p)) == NULL)
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goto err;
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if (r->q != NULL) {
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ret->length = BN_num_bits(r->q);
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if ((ret->q = BN_dup(r->q)) == NULL)
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goto err;
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}
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if (r->g != NULL)
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if ((ret->g = BN_dup(r->g)) == NULL)
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goto err;
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if (r->pub_key != NULL)
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if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
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goto err;
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if (r->priv_key != NULL)
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if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
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goto err;
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return ret;
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err:
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DH_free(ret);
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return NULL;
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}
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#endif
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void
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DSA_get0_pqg(const DSA *d, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
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{
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if (p != NULL)
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*p = d->p;
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if (q != NULL)
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*q = d->q;
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if (g != NULL)
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*g = d->g;
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}
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int
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DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
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{
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if ((d->p == NULL && p == NULL) || (d->q == NULL && q == NULL) ||
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(d->g == NULL && g == NULL))
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return 0;
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if (p != NULL) {
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BN_free(d->p);
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d->p = p;
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}
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if (q != NULL) {
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BN_free(d->q);
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d->q = q;
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}
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if (g != NULL) {
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BN_free(d->g);
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d->g = g;
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}
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return 1;
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}
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void
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DSA_get0_key(const DSA *d, const BIGNUM **pub_key, const BIGNUM **priv_key)
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{
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if (pub_key != NULL)
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*pub_key = d->pub_key;
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if (priv_key != NULL)
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*priv_key = d->priv_key;
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}
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int
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DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
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{
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if (d->pub_key == NULL && pub_key == NULL)
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return 0;
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if (pub_key != NULL) {
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BN_free(d->pub_key);
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d->pub_key = pub_key;
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}
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if (priv_key != NULL) {
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BN_free(d->priv_key);
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d->priv_key = priv_key;
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}
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return 1;
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}
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void
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DSA_clear_flags(DSA *d, int flags)
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{
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d->flags &= ~flags;
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}
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int
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DSA_test_flags(const DSA *d, int flags)
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{
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return d->flags & flags;
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}
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void
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DSA_set_flags(DSA *d, int flags)
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{
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d->flags |= flags;
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}
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ENGINE *
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DSA_get0_engine(DSA *d)
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|
|
{
|
||
|
|
return d->engine;
|
||
|
|
}
|