436 lines
12 KiB
C
436 lines
12 KiB
C
/* crypto/engine/e_gmp.c */
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/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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* project 2003.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2001 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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/* This engine is not (currently) compiled in by default. Do enable it,
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* reconfigure OpenSSL with "-DOPENSSL_USE_GMP -lgmp". The GMP libraries and
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* headers must reside in one of the paths searched by the compiler/linker,
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* otherwise paths must be specified - eg. try configuring with
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* "-DOPENSSL_USE_GMP -I<includepath> -L<libpath> -lgmp". YMMV. */
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/* As for what this does - it's a largely unoptimised implementation of an
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* ENGINE that uses the GMP library to perform RSA private key operations. To
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* obtain more information about what "unoptimised" means, see my original mail
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* on the subject (though ignore the build instructions which have since
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* changed);
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*
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* http://www.mail-archive.com/openssl-dev@openssl.org/msg12227.html
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*
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* On my athlon system at least, it appears the builtin OpenSSL code is now
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* slightly faster, which is to say that the RSA-related MPI performance
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* between OpenSSL's BIGNUM and GMP's mpz implementations is probably pretty
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* balanced for this chip, and so the performance degradation in this ENGINE by
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* having to convert to/from GMP formats (and not being able to cache
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* montgomery forms) is probably the difference. However, if some unconfirmed
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* reports from users is anything to go by, the situation on some other
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* chipsets might be a good deal more favourable to the GMP version (eg. PPC).
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* Feedback welcome. */
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#include <stdio.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/buffer.h>
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#include <openssl/engine.h>
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#ifndef OPENSSL_NO_HW
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#if defined(OPENSSL_USE_GMP) && !defined(OPENSSL_NO_HW_GMP)
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#include <gmp.h>
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#define E_GMP_LIB_NAME "gmp engine"
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#include "e_gmp_err.c"
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static int e_gmp_destroy(ENGINE *e);
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static int e_gmp_init(ENGINE *e);
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static int e_gmp_finish(ENGINE *e);
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static int e_gmp_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
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#ifndef OPENSSL_NO_RSA
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/* RSA stuff */
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static int e_gmp_rsa_mod_exp(BIGNUM *r, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
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static int e_gmp_rsa_finish(RSA *r);
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#endif
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/* The definitions for control commands specific to this engine */
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/* #define E_GMP_CMD_SO_PATH ENGINE_CMD_BASE */
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static const ENGINE_CMD_DEFN e_gmp_cmd_defns[] = {
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#if 0
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{E_GMP_CMD_SO_PATH,
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"SO_PATH",
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"Specifies the path to the 'e_gmp' shared library",
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ENGINE_CMD_FLAG_STRING},
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#endif
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{0, NULL, NULL, 0}
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};
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#ifndef OPENSSL_NO_RSA
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/* Our internal RSA_METHOD that we provide pointers to */
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static RSA_METHOD e_gmp_rsa =
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{
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"GMP RSA method",
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NULL,
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NULL,
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NULL,
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NULL,
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e_gmp_rsa_mod_exp,
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NULL,
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NULL,
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e_gmp_rsa_finish,
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/* These flags initialise montgomery crud that GMP ignores, however it
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* makes sure the public key ops (which are done in openssl) don't seem
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* *slower* than usual :-) */
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RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE,
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NULL,
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NULL,
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NULL
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};
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#endif
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/* Constants used when creating the ENGINE */
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static const char *engine_e_gmp_id = "gmp";
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static const char *engine_e_gmp_name = "GMP engine support";
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/* This internal function is used by ENGINE_gmp() and possibly by the
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* "dynamic" ENGINE support too */
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static int bind_helper(ENGINE *e)
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{
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#ifndef OPENSSL_NO_RSA
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const RSA_METHOD *meth1;
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#endif
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if(!ENGINE_set_id(e, engine_e_gmp_id) ||
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!ENGINE_set_name(e, engine_e_gmp_name) ||
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#ifndef OPENSSL_NO_RSA
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!ENGINE_set_RSA(e, &e_gmp_rsa) ||
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#endif
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!ENGINE_set_destroy_function(e, e_gmp_destroy) ||
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!ENGINE_set_init_function(e, e_gmp_init) ||
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!ENGINE_set_finish_function(e, e_gmp_finish) ||
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!ENGINE_set_ctrl_function(e, e_gmp_ctrl) ||
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!ENGINE_set_cmd_defns(e, e_gmp_cmd_defns))
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return 0;
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#ifndef OPENSSL_NO_RSA
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meth1 = RSA_PKCS1_SSLeay();
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e_gmp_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
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e_gmp_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
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e_gmp_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
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e_gmp_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
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e_gmp_rsa.bn_mod_exp = meth1->bn_mod_exp;
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#endif
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/* Ensure the e_gmp error handling is set up */
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ERR_load_GMP_strings();
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return 1;
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}
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static ENGINE *engine_gmp(void)
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{
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ENGINE *ret = ENGINE_new();
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if(!ret)
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return NULL;
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if(!bind_helper(ret))
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{
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ENGINE_free(ret);
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return NULL;
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}
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return ret;
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}
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void ENGINE_load_gmp(void)
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{
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/* Copied from eng_[openssl|dyn].c */
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ENGINE *toadd = engine_gmp();
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if(!toadd) return;
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ENGINE_add(toadd);
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ENGINE_free(toadd);
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ERR_clear_error();
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}
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#ifndef OPENSSL_NO_RSA
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/* Used to attach our own key-data to an RSA structure */
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static int hndidx_rsa = -1;
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#endif
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static int e_gmp_destroy(ENGINE *e)
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{
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ERR_unload_GMP_strings();
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return 1;
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}
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/* (de)initialisation functions. */
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static int e_gmp_init(ENGINE *e)
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{
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#ifndef OPENSSL_NO_RSA
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if (hndidx_rsa == -1)
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hndidx_rsa = RSA_get_ex_new_index(0,
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"GMP-based RSA key handle",
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NULL, NULL, NULL);
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#endif
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if (hndidx_rsa == -1)
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return 0;
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return 1;
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}
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static int e_gmp_finish(ENGINE *e)
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{
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return 1;
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}
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static int e_gmp_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
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{
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int to_return = 1;
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switch(cmd)
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{
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#if 0
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case E_GMP_CMD_SO_PATH:
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/* ... */
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#endif
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/* The command isn't understood by this engine */
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default:
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GMPerr(GMP_F_E_GMP_CTRL,
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GMP_R_CTRL_COMMAND_NOT_IMPLEMENTED);
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to_return = 0;
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break;
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}
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return to_return;
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}
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/* HACK - use text I/O functions in openssl and GMP to handle conversions. This
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* is vile. */
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static int bn2gmp(const BIGNUM *bn, mpz_t g)
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{
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int toret;
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char *tmpchar = BN_bn2hex(bn);
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if(!tmpchar) return 0;
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toret = (mpz_set_str(g, tmpchar, 16) == 0 ? 1 : 0);
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OPENSSL_free(tmpchar);
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return toret;
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}
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static int gmp2bn(mpz_t g, BIGNUM *bn)
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{
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int toret;
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char *tmpchar = OPENSSL_malloc(mpz_sizeinbase(g, 16) + 10);
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if(!tmpchar) return 0;
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mpz_get_str(tmpchar, 16, g);
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toret = BN_hex2bn(&bn, tmpchar);
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OPENSSL_free(tmpchar);
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return toret;
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}
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#ifndef OPENSSL_NO_RSA
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typedef struct st_e_gmp_rsa_ctx
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{
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int public_only;
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mpz_t n;
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mpz_t d;
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mpz_t e;
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mpz_t p;
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mpz_t q;
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mpz_t dmp1;
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mpz_t dmq1;
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mpz_t iqmp;
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mpz_t r0, r1, I0, m1;
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} E_GMP_RSA_CTX;
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static E_GMP_RSA_CTX *e_gmp_get_rsa(RSA *rsa)
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{
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E_GMP_RSA_CTX *hptr = RSA_get_ex_data(rsa, hndidx_rsa);
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if(hptr) return hptr;
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hptr = OPENSSL_malloc(sizeof(E_GMP_RSA_CTX));
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if(!hptr) return NULL;
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/* These inits could probably be replaced by more intelligent
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* mpz_init2() versions, to reduce malloc-thrashing. */
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mpz_init(hptr->n);
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mpz_init(hptr->d);
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mpz_init(hptr->e);
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mpz_init(hptr->p);
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mpz_init(hptr->q);
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mpz_init(hptr->dmp1);
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mpz_init(hptr->dmq1);
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mpz_init(hptr->iqmp);
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mpz_init(hptr->r0);
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mpz_init(hptr->r1);
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mpz_init(hptr->I0);
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mpz_init(hptr->m1);
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if(!bn2gmp(rsa->n, hptr->n) || !bn2gmp(rsa->e, hptr->e))
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goto err;
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if(!rsa->p || !rsa->q || !rsa->d || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
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{
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hptr->public_only = 1;
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return hptr;
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}
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if(!bn2gmp(rsa->d, hptr->d) || !bn2gmp(rsa->p, hptr->p) ||
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!bn2gmp(rsa->q, hptr->q) || !bn2gmp(rsa->dmp1, hptr->dmp1) ||
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!bn2gmp(rsa->dmq1, hptr->dmq1) || !bn2gmp(rsa->iqmp, hptr->iqmp))
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goto err;
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hptr->public_only = 0;
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RSA_set_ex_data(rsa, hndidx_rsa, hptr);
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return hptr;
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err:
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mpz_clear(hptr->n);
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mpz_clear(hptr->d);
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mpz_clear(hptr->e);
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mpz_clear(hptr->p);
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mpz_clear(hptr->q);
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mpz_clear(hptr->dmp1);
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mpz_clear(hptr->dmq1);
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mpz_clear(hptr->iqmp);
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mpz_clear(hptr->r0);
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mpz_clear(hptr->r1);
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mpz_clear(hptr->I0);
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mpz_clear(hptr->m1);
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OPENSSL_free(hptr);
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return NULL;
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}
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static int e_gmp_rsa_finish(RSA *rsa)
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{
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E_GMP_RSA_CTX *hptr = RSA_get_ex_data(rsa, hndidx_rsa);
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if(!hptr) return 0;
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mpz_clear(hptr->n);
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mpz_clear(hptr->d);
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mpz_clear(hptr->e);
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mpz_clear(hptr->p);
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mpz_clear(hptr->q);
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mpz_clear(hptr->dmp1);
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mpz_clear(hptr->dmq1);
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mpz_clear(hptr->iqmp);
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mpz_clear(hptr->r0);
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mpz_clear(hptr->r1);
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mpz_clear(hptr->I0);
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mpz_clear(hptr->m1);
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OPENSSL_free(hptr);
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RSA_set_ex_data(rsa, hndidx_rsa, NULL);
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return 1;
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}
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static int e_gmp_rsa_mod_exp(BIGNUM *r, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
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{
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E_GMP_RSA_CTX *hptr;
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int to_return = 0;
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hptr = e_gmp_get_rsa(rsa);
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if(!hptr)
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{
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GMPerr(GMP_F_E_GMP_RSA_MOD_EXP,
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GMP_R_KEY_CONTEXT_ERROR);
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return 0;
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}
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if(hptr->public_only)
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{
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GMPerr(GMP_F_E_GMP_RSA_MOD_EXP,
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GMP_R_MISSING_KEY_COMPONENTS);
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return 0;
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}
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/* ugh!!! */
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if(!bn2gmp(I, hptr->I0))
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return 0;
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/* This is basically the CRT logic in crypto/rsa/rsa_eay.c reworded into
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* GMP-speak. It may be that GMP's API facilitates cleaner formulations
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* of this stuff, eg. better handling of negatives, or functions that
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* combine operations. */
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mpz_mod(hptr->r1, hptr->I0, hptr->q);
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mpz_powm(hptr->m1, hptr->r1, hptr->dmq1, hptr->q);
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mpz_mod(hptr->r1, hptr->I0, hptr->p);
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mpz_powm(hptr->r0, hptr->r1, hptr->dmp1, hptr->p);
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mpz_sub(hptr->r0, hptr->r0, hptr->m1);
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if(mpz_sgn(hptr->r0) < 0)
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mpz_add(hptr->r0, hptr->r0, hptr->p);
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mpz_mul(hptr->r1, hptr->r0, hptr->iqmp);
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mpz_mod(hptr->r0, hptr->r1, hptr->p);
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if(mpz_sgn(hptr->r0) < 0)
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mpz_add(hptr->r0, hptr->r0, hptr->p);
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mpz_mul(hptr->r1, hptr->r0, hptr->q);
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mpz_add(hptr->r0, hptr->r1, hptr->m1);
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/* ugh!!! */
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if(gmp2bn(hptr->r0, r))
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to_return = 1;
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return 1;
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}
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#endif
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/* This stuff is needed if this ENGINE is being compiled into a self-contained
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* shared-library. */
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#ifdef ENGINE_DYNAMIC_SUPPORT
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static int bind_fn(ENGINE *e, const char *id)
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{
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if(id && (strcmp(id, engine_e_gmp_id) != 0))
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return 0;
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if(!bind_helper(e))
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return 0;
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return 1;
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}
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IMPLEMENT_DYNAMIC_CHECK_FN()
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IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
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#endif /* ENGINE_DYNAMIC_SUPPORT */
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#endif /* !OPENSSL_NO_HW_GMP */
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#endif /* !OPENSSL_NO_HW */
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