174 lines
6.1 KiB
C
174 lines
6.1 KiB
C
/* crypto/engine/engine_openssl.c */
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/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 1999 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 <openssl/crypto.h>
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#include "cryptlib.h"
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#include "engine_int.h"
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#include <openssl/engine.h>
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#include <openssl/dso.h>
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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#include <openssl/dh.h>
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#include <openssl/rand.h>
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#include <openssl/bn.h>
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/* This is the only function we need to implement as OpenSSL
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* doesn't have a native CRT mod_exp. Perhaps this should be
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* BN_mod_exp_crt and moved into crypto/bn/ ?? ... dunno. */
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static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
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const BIGNUM *iqmp, BN_CTX *ctx);
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/* The ENGINE structure that can be pointed to. */
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static ENGINE engine_openssl =
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{
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"openssl",
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"Software default engine support",
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NULL,
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NULL,
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NULL, /* these methods are "stolen" in ENGINE_openssl() */
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NULL,
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NULL,
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openssl_mod_exp_crt,
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NULL, /* no init() */
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NULL, /* no finish() */
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NULL, /* no ctrl() */
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NULL, /* no load_privkey() */
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NULL, /* no load_pubkey() */
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0, /* no flags */
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0, 0, /* no references. */
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NULL, NULL /* unlinked */
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};
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/* As this is only ever called once, there's no need for locking
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* (indeed - the lock will already be held by our caller!!!) */
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ENGINE *ENGINE_openssl()
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{
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/* We need to populate our structure with the software pointers
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* that we want to steal. */
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engine_openssl.rsa_meth = RSA_get_default_openssl_method();
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engine_openssl.dsa_meth = DSA_get_default_openssl_method();
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engine_openssl.dh_meth = DH_get_default_openssl_method();
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engine_openssl.rand_meth = RAND_SSLeay();
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engine_openssl.bn_mod_exp = BN_mod_exp;
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return &engine_openssl;
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}
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/* Chinese Remainder Theorem, taken and adapted from rsa_eay.c */
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static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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const BIGNUM *q, const BIGNUM *dmp1,
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const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
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{
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BIGNUM r1,m1;
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int ret=0;
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BN_CTX *bn_ctx;
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BIGNUM *temp_bn = NULL;
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if (ctx)
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bn_ctx = ctx;
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else
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if ((bn_ctx=BN_CTX_new()) == NULL) goto err;
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BN_init(&m1);
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BN_init(&r1);
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/* BN_mul() cannot accept const BIGNUMs so I use the BN_CTX
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* to duplicate what I need. <sigh> */
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if ((temp_bn = BN_CTX_get(bn_ctx)) == NULL) goto err;
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if (!BN_copy(temp_bn, iqmp)) goto err;
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if (!BN_mod(&r1, a, q, bn_ctx)) goto err;
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if (!engine_openssl.bn_mod_exp(&m1, &r1, dmq1, q, bn_ctx))
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goto err;
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if (!BN_mod(&r1, a, p, bn_ctx)) goto err;
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if (!engine_openssl.bn_mod_exp(r, &r1, dmp1, p, bn_ctx))
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goto err;
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if (!BN_sub(r, r, &m1)) goto err;
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/* This will help stop the size of r0 increasing, which does
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* affect the multiply if it optimised for a power of 2 size */
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if (r->neg)
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if (!BN_add(r, r, p)) goto err;
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if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
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if (!BN_mod(r, &r1, p, bn_ctx)) goto err;
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/* If p < q it is occasionally possible for the correction of
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* adding 'p' if r is negative above to leave the result still
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* negative. This can break the private key operations: the following
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* second correction should *always* correct this rare occurrence.
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* This will *never* happen with OpenSSL generated keys because
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* they ensure p > q [steve]
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*/
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if (r->neg)
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if (!BN_add(r, r, p)) goto err;
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/* Again, BN_mul() will need non-const values. */
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if (!BN_copy(temp_bn, q)) goto err;
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if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
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if (!BN_add(r, &r1, &m1)) goto err;
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ret=1;
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err:
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BN_clear_free(&m1);
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BN_clear_free(&r1);
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if (temp_bn)
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bn_ctx->tos--;
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if (!ctx)
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BN_CTX_free(bn_ctx);
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return(ret);
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}
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