+++ /dev/null
-/* crypto/engine/engine_openssl.c */
-/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
- * project 2000.
- */
-/* ====================================================================
- * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
-
-
-#include <stdio.h>
-#include <openssl/crypto.h>
-#include "cryptlib.h"
-#include <openssl/engine.h>
-#include <openssl/dso.h>
-
-/* This is the only function we need to implement as OpenSSL
- * doesn't have a native CRT mod_exp. Perhaps this should be
- * BN_mod_exp_crt and moved into crypto/bn/ ?? ... dunno. */
-static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
- const BIGNUM *iqmp, BN_CTX *ctx);
-
-/* The constants used when creating the ENGINE */
-static const char *engine_openssl_id = "openssl";
-static const char *engine_openssl_name = "Software default engine support";
-
-/* As this is only ever called once, there's no need for locking
- * (indeed - the lock will already be held by our caller!!!) */
-ENGINE *ENGINE_openssl(void)
- {
- ENGINE *ret = ENGINE_new();
- if(!ret)
- return NULL;
- if(!ENGINE_set_id(ret, engine_openssl_id) ||
- !ENGINE_set_name(ret, engine_openssl_name) ||
-#ifndef OPENSSL_NO_RSA
- !ENGINE_set_RSA(ret, RSA_get_default_openssl_method()) ||
-#endif
-#ifndef OPENSSL_NO_DSA
- !ENGINE_set_DSA(ret, DSA_get_default_openssl_method()) ||
-#endif
-#ifndef OPENSSL_NO_DH
- !ENGINE_set_DH(ret, DH_get_default_openssl_method()) ||
-#endif
- !ENGINE_set_RAND(ret, RAND_SSLeay()) ||
- !ENGINE_set_BN_mod_exp(ret, BN_mod_exp) ||
- !ENGINE_set_BN_mod_exp_crt(ret, openssl_mod_exp_crt))
- {
- ENGINE_free(ret);
- return NULL;
- }
- return ret;
- }
-
-/* Chinese Remainder Theorem, taken and adapted from rsa_eay.c */
-static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *q, const BIGNUM *dmp1,
- const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
- {
- BIGNUM r1,m1;
- int ret=0;
- BN_CTX *bn_ctx;
- BIGNUM *temp_bn = NULL;
-
- if (ctx)
- bn_ctx = ctx;
- else
- if ((bn_ctx=BN_CTX_new()) == NULL) goto err;
- BN_init(&m1);
- BN_init(&r1);
- /* BN_mul() cannot accept const BIGNUMs so I use the BN_CTX
- * to duplicate what I need. <sigh> */
- BN_CTX_start(bn_ctx);
- if ((temp_bn = BN_CTX_get(bn_ctx)) == NULL) goto err;
- if (!BN_copy(temp_bn, iqmp)) goto err;
-
- if (!BN_mod(&r1, a, q, bn_ctx)) goto err;
- if (!BN_mod_exp(&m1, &r1, dmq1, q, bn_ctx))
- goto err;
-
- if (!BN_mod(&r1, a, p, bn_ctx)) goto err;
- if (!BN_mod_exp(r, &r1, dmp1, p, bn_ctx))
- goto err;
-
- if (!BN_sub(r, r, &m1)) goto err;
- /* This will help stop the size of r0 increasing, which does
- * affect the multiply if it optimised for a power of 2 size */
- if (r->neg)
- if (!BN_add(r, r, p)) goto err;
-
- if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
- if (!BN_mod(r, &r1, p, bn_ctx)) goto err;
- /* If p < q it is occasionally possible for the correction of
- * adding 'p' if r is negative above to leave the result still
- * negative. This can break the private key operations: the following
- * second correction should *always* correct this rare occurrence.
- * This will *never* happen with OpenSSL generated keys because
- * they ensure p > q [steve]
- */
- if (r->neg)
- if (!BN_add(r, r, p)) goto err;
- /* Again, BN_mul() will need non-const values. */
- if (!BN_copy(temp_bn, q)) goto err;
- if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
- if (!BN_add(r, &r1, &m1)) goto err;
-
- ret=1;
-err:
- BN_clear_free(&m1);
- BN_clear_free(&r1);
- BN_CTX_end(ctx);
- if (!ctx)
- BN_CTX_free(bn_ctx);
- return(ret);
- }
projects / openssl.git / blobdiff