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openssl/crypto/dh/dh_key.c
Matt Caswell 0f113f3ee4 Run util/openssl-format-source -v -c . 
Reviewed-by: Tim Hudson <tjh@openssl.org>
2015-01-22 09:20:09 +00:00

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/* crypto/dh/dh_key.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/rand.h>
#include <openssl/dh.h>
#include "internal/bn_int.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);
}
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
{
int rv, pad;
rv = dh->meth->compute_key(key, pub_key, dh);
if (rv <= 0)
return rv;
pad = BN_num_bytes(dh->p) - rv;
if (pad > 0) {
memmove(key + pad, key, rv);
memset(key, 0, pad);
}
return rv + pad;
}
static DH_METHOD dh_ossl = {
"OpenSSL DH Method",
generate_key,
compute_key,
dh_bn_mod_exp,
dh_init,
dh_finish,
DH_FLAG_FIPS_METHOD,
NULL,
NULL
};
const DH_METHOD *DH_OpenSSL(void)
{
return &dh_ossl;
}
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;
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;
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 (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 */
l = dh->length ? dh->length : BN_num_bits(dh->p) - 1;
if (!BN_rand(priv_key, l, 0, 0))
goto err;
}
}
{
BIGNUM *local_prk = NULL;
BIGNUM *prk;
if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) {
local_prk = prk = BN_new();
BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
} else
prk = priv_key;
if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) {
if (local_prk)
BN_free(local_prk);
goto err;
}
if (local_prk)
BN_free(local_prk);
}
dh->pub_key = pub_key;
dh->priv_key = priv_key;
ok = 1;
err:
if (ok != 1)
DHerr(DH_F_GENERATE_KEY, ERR_R_BN_LIB);
if ((pub_key != NULL) && (dh->pub_key == NULL))
BN_free(pub_key);
if ((priv_key != NULL) && (dh->priv_key == NULL))
BN_free(priv_key);
BN_CTX_free(ctx);
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) {
DHerr(DH_F_COMPUTE_KEY, DH_R_MODULUS_TOO_LARGE);
goto err;
}
ctx = BN_CTX_new();
if (ctx == NULL)
goto err;
BN_CTX_start(ctx);
tmp = BN_CTX_get(ctx);
if (dh->priv_key == NULL) {
DHerr(DH_F_COMPUTE_KEY, 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);
if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0) {
/* XXX */
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) {
DHerr(DH_F_COMPUTE_KEY, DH_R_INVALID_PUBKEY);
goto err;
}
if (!dh->
meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key, dh->p, ctx, mont)) {
DHerr(DH_F_COMPUTE_KEY, 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)
{
/*
* If a is only one word long and constant time is false, use the faster
* exponenentiation function.
*/
if (bn_get_top(a) == 1 && ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) != 0)) {
BN_ULONG A = bn_get_words(a)[0];
return BN_mod_exp_mont_word(r, A, p, m, ctx, m_ctx);
} else
return BN_mod_exp_mont(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)
{
if (dh->method_mont_p)
BN_MONT_CTX_free(dh->method_mont_p);
return (1);
}
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