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Eyck Jentzsch
2019-06-28 23:08:36 +02:00
commit 4d8973e20b
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FreeRTOSv10.2.1/FreeRTOS-Plus/Source/WolfSSL/wolfcrypt/src/curve25519.c Normal file
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/* curve25519.c
*
* Copyright (C) 2006-2015 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* Based On Daniel J Bernstein's curve25519 Public Domain ref10 work. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#ifdef HAVE_CURVE25519
#include <wolfssl/wolfcrypt/curve25519.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#include <wolfcrypt/src/misc.c>
#endif
const curve25519_set_type curve25519_sets[] = {
{
32,
"CURVE25519",
}
};
int wc_curve25519_make_key(RNG* rng, int keysize, curve25519_key* key)
{
unsigned char basepoint[CURVE25519_KEYSIZE] = {9};
unsigned char n[CURVE25519_KEYSIZE];
unsigned char p[CURVE25519_KEYSIZE];
int i;
int ret;
if (key == NULL || rng == NULL)
return ECC_BAD_ARG_E;
/* currently only a key size of 32 bytes is used */
if (keysize != CURVE25519_KEYSIZE)
return ECC_BAD_ARG_E;
/* get random number from RNG */
ret = wc_RNG_GenerateBlock(rng, n, keysize);
if (ret != 0)
return ret;
for (i = 0; i < keysize; ++i) key->k.point[i] = n[i];
key->k.point[ 0] &= 248;
key->k.point[31] &= 127;
key->k.point[31] |= 64;
/* compute public key */
ret = curve25519(p, key->k.point, basepoint);
/* store keys in big endian format */
for (i = 0; i < keysize; ++i) n[i] = key->k.point[i];
for (i = 0; i < keysize; ++i) {
key->p.point[keysize - i - 1] = p[i];
key->k.point[keysize - i - 1] = n[i];
}
ForceZero(n, keysize);
ForceZero(p, keysize);
return ret;
}
int wc_curve25519_shared_secret(curve25519_key* private_key,
curve25519_key* public_key,
byte* out, word32* outlen)
{
unsigned char k[CURVE25519_KEYSIZE];
unsigned char p[CURVE25519_KEYSIZE];
unsigned char o[CURVE25519_KEYSIZE];
int ret = 0;
int i;
/* sanity check */
if (private_key == NULL || public_key == NULL || out == NULL ||
outlen == NULL)
return BAD_FUNC_ARG;
/* avoid implementation fingerprinting */
if (public_key->p.point[0] > 0x7F)
return ECC_BAD_ARG_E;
XMEMSET(p, 0, sizeof(p));
XMEMSET(k, 0, sizeof(k));
XMEMSET(out, 0, CURVE25519_KEYSIZE);
for (i = 0; i < CURVE25519_KEYSIZE; ++i) {
p[i] = public_key->p.point [CURVE25519_KEYSIZE - i - 1];
k[i] = private_key->k.point[CURVE25519_KEYSIZE - i - 1];
}
ret = curve25519(o , k, p);
*outlen = CURVE25519_KEYSIZE;
for (i = 0; i < CURVE25519_KEYSIZE; ++i) {
out[i] = o[CURVE25519_KEYSIZE - i -1];
}
ForceZero(p, sizeof(p));
ForceZero(k, sizeof(k));
ForceZero(o, sizeof(o));
return ret;
}
/* curve25519 uses a serialized string for key representation */
int wc_curve25519_export_public(curve25519_key* key, byte* out, word32* outLen)
{
word32 keySz;
if (key == NULL || out == NULL || outLen == NULL)
return BAD_FUNC_ARG;
/* check size of outgoing key */
keySz = wc_curve25519_size(key);
/* copy in public key */
XMEMCPY(out, key->p.point, keySz);
*outLen = keySz;
return 0;
}
/* import curve25519 public key
return 0 on success */
int wc_curve25519_import_public(const byte* in, word32 inLen,
curve25519_key* key)
{
word32 keySz;
/* sanity check */
if (key == NULL || in == NULL)
return ECC_BAD_ARG_E;
/* check size of incoming keys */
keySz = wc_curve25519_size(key);
if (inLen != keySz)
return ECC_BAD_ARG_E;
XMEMCPY(key->p.point, in, inLen);
key->dp = &curve25519_sets[0];
return 0;
}
/* export curve25519 private key only raw, outLen is in/out size
return 0 on success */
int wc_curve25519_export_private_raw(curve25519_key* key, byte* out,
word32* outLen)
{
word32 keySz;
/* sanity check */
if (key == NULL || out == NULL || outLen == NULL)
return ECC_BAD_ARG_E;
keySz = wc_curve25519_size(key);
*outLen = keySz;
XMEMSET(out, 0, keySz);
XMEMCPY(out, key->k.point, keySz);
return 0;
}
/* curve25519 private key import.
Public key to match private key needs to be imported too */
int wc_curve25519_import_private_raw(const byte* priv, word32 privSz,
const byte* pub, word32 pubSz, curve25519_key* key)
{
int ret = 0;
word32 keySz;
/* sanity check */
if (key == NULL || priv == NULL || pub == NULL)
return ECC_BAD_ARG_E;
/* check size of incoming keys */
keySz = wc_curve25519_size(key);
if (privSz != keySz || pubSz != keySz)
return ECC_BAD_ARG_E;
XMEMCPY(key->k.point, priv, privSz);
XMEMCPY(key->p.point, pub, pubSz);
return ret;
}
int wc_curve25519_init(curve25519_key* key)
{
word32 keySz;
if (key == NULL)
return ECC_BAD_ARG_E;
/* currently the format for curve25519 */
key->dp = &curve25519_sets[0];
keySz = key->dp->size;
XMEMSET(key->k.point, 0, keySz);
XMEMSET(key->p.point, 0, keySz);
return 0;
}
/* Clean the memory of a key */
void wc_curve25519_free(curve25519_key* key)
{
if (key == NULL)
return;
key->dp = NULL;
ForceZero(key->p.point, sizeof(key->p.point));
ForceZero(key->k.point, sizeof(key->k.point));
}
/* get key size */
int wc_curve25519_size(curve25519_key* key)
{
if (key == NULL) return 0;
return key->dp->size;
}
#endif /*HAVE_CURVE25519*/