312 lines
8.2 KiB
C
312 lines
8.2 KiB
C
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/* crypto/dsa/dsa_lib.c */
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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 "cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/asn1.h>
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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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#ifndef OPENSSL_NO_DH
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#include <openssl/dh.h>
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#endif
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const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT;
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static const DSA_METHOD *default_DSA_method = NULL;
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void 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 *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 *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 DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
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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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const DSA_METHOD *mtmp;
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mtmp = dsa->meth;
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if (mtmp->finish) mtmp->finish(dsa);
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#ifndef OPENSSL_NO_ENGINE
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if (dsa->engine)
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{
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ENGINE_finish(dsa->engine);
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dsa->engine = NULL;
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}
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#endif
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dsa->meth = meth;
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if (meth->init) meth->init(dsa);
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return 1;
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}
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DSA *DSA_new_method(ENGINE *engine)
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{
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DSA *ret;
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ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
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if (ret == NULL)
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{
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DSAerr(DSA_F_DSA_NEW_METHOD,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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{
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if (!ENGINE_init(engine))
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{
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DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
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OPENSSL_free(ret);
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return NULL;
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}
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ret->engine = engine;
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}
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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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{
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ret->meth = ENGINE_get_DSA(ret->engine);
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if(!ret->meth)
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{
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DSAerr(DSA_F_DSA_NEW_METHOD,
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ERR_R_ENGINE_LIB);
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ENGINE_finish(ret->engine);
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OPENSSL_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;
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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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{
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#ifndef OPENSSL_NO_ENGINE
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if (ret->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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OPENSSL_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 DSA_free(DSA *r)
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{
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int i;
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if (r == NULL) return;
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i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
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#ifdef REF_PRINT
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REF_PRINT("DSA",r);
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#endif
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if (i > 0) return;
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#ifdef REF_CHECK
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if (i < 0)
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{
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fprintf(stderr,"DSA_free, bad reference count\n");
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abort();
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}
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#endif
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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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if(r->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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if (r->p != NULL) BN_clear_free(r->p);
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if (r->q != NULL) BN_clear_free(r->q);
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if (r->g != NULL) BN_clear_free(r->g);
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if (r->pub_key != NULL) BN_clear_free(r->pub_key);
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if (r->priv_key != NULL) BN_clear_free(r->priv_key);
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if (r->kinv != NULL) BN_clear_free(r->kinv);
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if (r->r != NULL) BN_clear_free(r->r);
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OPENSSL_free(r);
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}
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int 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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#ifdef REF_PRINT
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REF_PRINT("DSA",r);
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#endif
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#ifdef REF_CHECK
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if (i < 2)
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{
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fprintf(stderr, "DSA_up_ref, bad reference count\n");
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abort();
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}
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#endif
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return ((i > 1) ? 1 : 0);
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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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int 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 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 *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 *DSA_dup_DH(const DSA *r)
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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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*/
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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 (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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if (ret != NULL)
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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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