early-access version 1255
This commit is contained in:
pineappleEA
247
externals/libressl/crypto/dh/dh_key.c
vendored
Executable file
247
externals/libressl/crypto/dh/dh_key.c
vendored
Executable file
@@ -0,0 +1,247 @@
|
||||
/* $OpenBSD: dh_key.c,v 1.36 2018/11/12 17:39:17 tb Exp $ */
|
||||
/* 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 <openssl/bn.h>
|
||||
#include <openssl/dh.h>
|
||||
#include <openssl/err.h>
|
||||
|
||||
#include "bn_lcl.h"
|
||||
|
||||
static int generate_key(DH *dh);
|
||||
static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
|
||||
static int dh_bn_mod_exp(const DH *dh, BIGNUM *r, const BIGNUM *a,
|
||||
const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
|
||||
static int dh_init(DH *dh);
|
||||
static int dh_finish(DH *dh);
|
||||
|
||||
int
|
||||
DH_generate_key(DH *dh)
|
||||
{
|
||||
return dh->meth->generate_key(dh);
|
||||
}
|
||||
|
||||
int
|
||||
DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
|
||||
{
|
||||
return dh->meth->compute_key(key, pub_key, dh);
|
||||
}
|
||||
|
||||
static DH_METHOD dh_ossl = {
|
||||
.name = "OpenSSL DH Method",
|
||||
.generate_key = generate_key,
|
||||
.compute_key = compute_key,
|
||||
.bn_mod_exp = dh_bn_mod_exp,
|
||||
.init = dh_init,
|
||||
.finish = dh_finish,
|
||||
};
|
||||
|
||||
const DH_METHOD *
|
||||
DH_OpenSSL(void)
|
||||
{
|
||||
return &dh_ossl;
|
||||
}
|
||||
|
||||
static int
|
||||
generate_key(DH *dh)
|
||||
{
|
||||
int ok = 0;
|
||||
unsigned l;
|
||||
BN_CTX *ctx;
|
||||
BN_MONT_CTX *mont = NULL;
|
||||
BIGNUM *pub_key = NULL, *priv_key = NULL, *two = NULL;
|
||||
|
||||
if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
|
||||
DHerror(DH_R_MODULUS_TOO_LARGE);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ctx = BN_CTX_new();
|
||||
if (ctx == NULL)
|
||||
goto err;
|
||||
|
||||
if ((priv_key = dh->priv_key) == NULL) {
|
||||
if ((priv_key = BN_new()) == NULL)
|
||||
goto err;
|
||||
}
|
||||
|
||||
if ((pub_key = dh->pub_key) == NULL) {
|
||||
if ((pub_key = BN_new()) == NULL)
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (dh->flags & DH_FLAG_CACHE_MONT_P) {
|
||||
mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
|
||||
CRYPTO_LOCK_DH, dh->p, ctx);
|
||||
if (!mont)
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (dh->priv_key == NULL) {
|
||||
if (dh->q) {
|
||||
if ((two = BN_new()) == NULL)
|
||||
goto err;
|
||||
if (!BN_add(two, BN_value_one(), BN_value_one()))
|
||||
goto err;
|
||||
if (!bn_rand_interval(priv_key, two, dh->q))
|
||||
goto err;
|
||||
} else {
|
||||
/* secret exponent length */
|
||||
l = dh->length ? dh->length : BN_num_bits(dh->p) - 1;
|
||||
if (!BN_rand(priv_key, l, 0, 0))
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, priv_key, dh->p, ctx,
|
||||
mont))
|
||||
goto err;
|
||||
|
||||
dh->pub_key = pub_key;
|
||||
dh->priv_key = priv_key;
|
||||
ok = 1;
|
||||
err:
|
||||
if (ok != 1)
|
||||
DHerror(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);
|
||||
BN_free(two);
|
||||
return ok;
|
||||
}
|
||||
|
||||
static int
|
||||
compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
|
||||
{
|
||||
BN_CTX *ctx = NULL;
|
||||
BN_MONT_CTX *mont = NULL;
|
||||
BIGNUM *tmp;
|
||||
int ret = -1;
|
||||
int check_result;
|
||||
|
||||
if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
|
||||
DHerror(DH_R_MODULUS_TOO_LARGE);
|
||||
goto err;
|
||||
}
|
||||
|
||||
ctx = BN_CTX_new();
|
||||
if (ctx == NULL)
|
||||
goto err;
|
||||
BN_CTX_start(ctx);
|
||||
if ((tmp = BN_CTX_get(ctx)) == NULL)
|
||||
goto err;
|
||||
|
||||
if (dh->priv_key == NULL) {
|
||||
DHerror(DH_R_NO_PRIVATE_VALUE);
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (dh->flags & DH_FLAG_CACHE_MONT_P) {
|
||||
mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,
|
||||
CRYPTO_LOCK_DH, dh->p, ctx);
|
||||
|
||||
BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);
|
||||
|
||||
if (!mont)
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) {
|
||||
DHerror(DH_R_INVALID_PUBKEY);
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (!dh->meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key, dh->p, ctx,
|
||||
mont)) {
|
||||
DHerror(ERR_R_BN_LIB);
|
||||
goto err;
|
||||
}
|
||||
|
||||
ret = BN_bn2bin(tmp, key);
|
||||
err:
|
||||
if (ctx != NULL) {
|
||||
BN_CTX_end(ctx);
|
||||
BN_CTX_free(ctx);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
dh_bn_mod_exp(const DH *dh, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
|
||||
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
|
||||
{
|
||||
return BN_mod_exp_mont_ct(r, a, p, m, ctx, m_ctx);
|
||||
}
|
||||
|
||||
static int
|
||||
dh_init(DH *dh)
|
||||
{
|
||||
dh->flags |= DH_FLAG_CACHE_MONT_P;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
dh_finish(DH *dh)
|
||||
{
|
||||
BN_MONT_CTX_free(dh->method_mont_p);
|
||||
return 1;
|
||||
}
|
||||
Reference in New Issue
Block a user