diff options
Diffstat (limited to 'openssl/crypto/dh/dh_gen.c')
| -rw-r--r-- | openssl/crypto/dh/dh_gen.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/openssl/crypto/dh/dh_gen.c b/openssl/crypto/dh/dh_gen.c deleted file mode 100644 index cfd5b118..00000000 --- a/openssl/crypto/dh/dh_gen.c +++ /dev/null @@ -1,175 +0,0 @@ -/* 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.] - */ - -/* NB: These functions have been upgraded - the previous prototypes are in - * dh_depr.c as wrappers to these ones. - * - Geoff - */ - -#include <stdio.h> -#include "cryptlib.h" -#include <openssl/bn.h> -#include <openssl/dh.h> - -static int dh_builtin_genparams(DH *ret, int prime_len, int generator, BN_GENCB *cb); - -int DH_generate_parameters_ex(DH *ret, int prime_len, int generator, BN_GENCB *cb) - { - if(ret->meth->generate_params) - return ret->meth->generate_params(ret, prime_len, generator, cb); - return dh_builtin_genparams(ret, prime_len, generator, cb); - } - -/* 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. - */ -/* Actually there is no reason to insist that 'generator' be a generator. - * It's just as OK (and in some sense better) to use a generator of the - * order-q subgroup. - */ -static int dh_builtin_genparams(DH *ret, int prime_len, int generator, BN_GENCB *cb) - { - BIGNUM *t1,*t2; - int g,ok= -1; - BN_CTX *ctx=NULL; - - 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; - - /* Make sure 'ret' has the necessary elements */ - if(!ret->p && ((ret->p = BN_new()) == NULL)) goto err; - if(!ret->g && ((ret->g = BN_new()) == NULL)) goto err; - - if (generator <= 1) - { - DHerr(DH_F_DH_BUILTIN_GENPARAMS, DH_R_BAD_GENERATOR); - goto err; - } - if (generator == DH_GENERATOR_2) - { - if (!BN_set_word(t1,24)) goto err; - if (!BN_set_word(t2,11)) goto err; - g=2; - } -#if 0 /* does not work for safe primes */ - else if (generator == DH_GENERATOR_3) - { - if (!BN_set_word(t1,12)) goto err; - if (!BN_set_word(t2,5)) goto err; - g=3; - } -#endif - else if (generator == DH_GENERATOR_5) - { - if (!BN_set_word(t1,10)) goto err; - if (!BN_set_word(t2,3)) goto err; - /* BN_set_word(t3,7); just have to miss - * out on these ones :-( */ - g=5; - } - else - { - /* in the general case, don't worry if 'generator' is a - * generator or not: since we are using safe primes, - * it will generate either an order-q or an order-2q group, - * which both is OK */ - if (!BN_set_word(t1,2)) goto err; - if (!BN_set_word(t2,1)) goto err; - g=generator; - } - - if(!BN_generate_prime_ex(ret->p,prime_len,1,t1,t2,cb)) goto err; - if(!BN_GENCB_call(cb, 3, 0)) goto err; - if (!BN_set_word(ret->g,g)) goto err; - ok=1; -err: - if (ok == -1) - { - DHerr(DH_F_DH_BUILTIN_GENPARAMS,ERR_R_BN_LIB); - ok=0; - } - - if (ctx != NULL) - { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - return ok; - } |