+++ /dev/null
-/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All Rights Reserved.
- *
- * The contents of this file constitute Original Code as defined in and are
- * subject to the Apple Public Source License Version 1.2 (the 'License').
- * You may not use this file except in compliance with the License. Please obtain
- * a copy of the License at http://www.apple.com/publicsource and read it before
- * using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
- * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
- * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
- * specific language governing rights and limitations under the License.
- */
-
-/* crypto/dh/dh_gen.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-#include <stdio.h>
-#include "cryptlib.h"
-#include <openssl/bn.h>
-#include <openssl/dh.h>
-
-/* We generate DH parameters as follows
- * find a prime q which is prime_len/2 bits long.
- * p=(2*q)+1 or (p-1)/2 = q
- * For this case, g is a generator if
- * g^((p-1)/q) mod p != 1 for values of q which are the factors of p-1.
- * Since the factors of p-1 are q and 2, we just need to check
- * g^2 mod p != 1 and g^q mod p != 1.
- *
- * Having said all that,
- * there is another special case method for the generators 2, 3 and 5.
- * for 2, p mod 24 == 11
- * for 3, p mod 12 == 5 <<<<< does not work for safe primes.
- * for 5, p mod 10 == 3 or 7
- *
- * Thanks to Phil Karn <karn@qualcomm.com> for the pointers about the
- * special generators and for answering some of my questions.
- *
- * I've implemented the second simple method :-).
- * Since DH should be using a safe prime (both p and q are prime),
- * this generator function can take a very very long time to run.
- */
-
-DH *DH_generate_parameters(int prime_len, int generator,
- void (*callback)(int,int,void *), void *cb_arg)
- {
- BIGNUM *p=NULL,*t1,*t2;
- DH *ret=NULL;
- int g,ok= -1;
- BN_CTX *ctx=NULL;
-
- ret=DH_new();
- if (ret == NULL) goto err;
- ctx=BN_CTX_new();
- if (ctx == NULL) goto err;
- BN_CTX_start(ctx);
- t1 = BN_CTX_get(ctx);
- t2 = BN_CTX_get(ctx);
- if (t1 == NULL || t2 == NULL) goto err;
-
- if (generator == DH_GENERATOR_2)
- {
- BN_set_word(t1,24);
- BN_set_word(t2,11);
- g=2;
- }
-#ifdef undef /* does not work for safe primes */
- else if (generator == DH_GENERATOR_3)
- {
- BN_set_word(t1,12);
- BN_set_word(t2,5);
- g=3;
- }
-#endif
- else if (generator == DH_GENERATOR_5)
- {
- BN_set_word(t1,10);
- BN_set_word(t2,3);
- /* BN_set_word(t3,7); just have to miss
- * out on these ones :-( */
- g=5;
- }
- else
- g=generator;
-
- p=BN_generate_prime(NULL,prime_len,1,t1,t2,callback,cb_arg);
- if (p == NULL) goto err;
- if (callback != NULL) callback(3,0,cb_arg);
- ret->p=p;
- ret->g=BN_new();
- if (!BN_set_word(ret->g,g)) goto err;
- ok=1;
-err:
- if (ok == -1)
- {
- DHerr(DH_F_DH_GENERATE_PARAMETERS,ERR_R_BN_LIB);
- ok=0;
- }
-
- if (ctx != NULL)
- {
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- }
- if (!ok && (ret != NULL))
- {
- DH_free(ret);
- ret=NULL;
- }
- return(ret);
- }
projects / apple / security.git / blobdiff