diff options
Diffstat (limited to 'src/crypto/dh/dh_impl.c')
| -rw-r--r-- | src/crypto/dh/dh_impl.c | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/src/crypto/dh/dh_impl.c b/src/crypto/dh/dh_impl.c deleted file mode 100644 index 6cf0abb6..00000000 --- a/src/crypto/dh/dh_impl.c +++ /dev/null @@ -1,326 +0,0 @@ -/* 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 <openssl/dh.h> - -#include <openssl/bn.h> -#include <openssl/err.h> -#include <openssl/thread.h> - -#include "internal.h" - - -#define OPENSSL_DH_MAX_MODULUS_BITS 10000 - -static int generate_parameters(DH *ret, int prime_bits, int generator, BN_GENCB *cb) { - /* We generate DH parameters as follows - * find a prime q which is prime_bits/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. - */ - - BIGNUM *t1, *t2; - int g, ok = 0; - 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) { - OPENSSL_PUT_ERROR(DH, 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; - } 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_bits, 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) { - OPENSSL_PUT_ERROR(DH, ERR_R_BN_LIB); - } - - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - return ok; -} - -static int generate_key(DH *dh) { - int ok = 0; - int generate_new_key = 0; - unsigned l; - BN_CTX *ctx; - BN_MONT_CTX *mont = NULL; - BIGNUM *pub_key = NULL, *priv_key = NULL; - BIGNUM local_priv; - - ctx = BN_CTX_new(); - if (ctx == NULL) { - goto err; - } - - if (dh->priv_key == NULL) { - priv_key = BN_new(); - if (priv_key == NULL) { - goto err; - } - generate_new_key = 1; - } else { - priv_key = dh->priv_key; - } - - if (dh->pub_key == NULL) { - pub_key = BN_new(); - if (pub_key == NULL) { - goto err; - } - } else { - pub_key = dh->pub_key; - } - - mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, &dh->method_mont_p_lock, - dh->p, ctx); - if (!mont) { - goto err; - } - - if (generate_new_key) { - if (dh->q) { - do { - if (!BN_rand_range(priv_key, dh->q)) { - goto err; - } - } while (BN_is_zero(priv_key) || BN_is_one(priv_key)); - } else { - /* secret exponent length */ - DH_check_standard_parameters(dh); - l = dh->priv_length ? dh->priv_length : BN_num_bits(dh->p) - 1; - if (!BN_rand(priv_key, l, 0, 0)) { - goto err; - } - } - } - - BN_with_flags(&local_priv, priv_key, BN_FLG_CONSTTIME); - if (!BN_mod_exp_mont(pub_key, dh->g, &local_priv, dh->p, ctx, mont)) { - goto err; - } - - dh->pub_key = pub_key; - dh->priv_key = priv_key; - ok = 1; - -err: - if (ok != 1) { - OPENSSL_PUT_ERROR(DH, ERR_R_BN_LIB); - } - - if (dh->pub_key == NULL) { - BN_free(pub_key); - } - if (dh->priv_key == NULL) { - BN_free(priv_key); - } - BN_CTX_free(ctx); - return ok; -} - -static int compute_key(DH *dh, unsigned char *out, const BIGNUM *pub_key) { - BN_CTX *ctx = NULL; - BN_MONT_CTX *mont = NULL; - BIGNUM *shared_key; - int ret = -1; - int check_result; - BIGNUM local_priv; - - if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) { - OPENSSL_PUT_ERROR(DH, DH_R_MODULUS_TOO_LARGE); - goto err; - } - - ctx = BN_CTX_new(); - if (ctx == NULL) { - goto err; - } - BN_CTX_start(ctx); - shared_key = BN_CTX_get(ctx); - if (shared_key == NULL) { - goto err; - } - - if (dh->priv_key == NULL) { - OPENSSL_PUT_ERROR(DH, DH_R_NO_PRIVATE_VALUE); - goto err; - } - - mont = BN_MONT_CTX_set_locked(&dh->method_mont_p, &dh->method_mont_p_lock, - dh->p, ctx); - if (!mont) { - goto err; - } - - if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) { - OPENSSL_PUT_ERROR(DH, DH_R_INVALID_PUBKEY); - goto err; - } - - BN_with_flags(&local_priv, dh->priv_key, BN_FLG_CONSTTIME); - if (!BN_mod_exp_mont(shared_key, pub_key, &local_priv, dh->p, ctx, - mont)) { - OPENSSL_PUT_ERROR(DH, ERR_R_BN_LIB); - goto err; - } - - ret = BN_bn2bin(shared_key, out); - -err: - if (ctx != NULL) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - - return ret; -} - -const struct dh_method DH_default_method = { - { - 0 /* references */, - 1 /* is_static */, - }, - NULL /* app_data */, - NULL /* init */, - NULL /* finish */, - generate_parameters, - generate_key, - compute_key, -}; |