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https://github.com/yuzu-emu/mbedtls.git
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198 lines
6.9 KiB
C
198 lines
6.9 KiB
C
/* ec_dh.c - TinyCrypt implementation of EC-DH */
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/*
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* Copyright (c) 2019, Arm Limited (or its affiliates), All Rights Reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* Copyright (c) 2014, Kenneth MacKay
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <tinycrypt/ecc.h>
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#include <tinycrypt/ecc_dh.h>
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#include <string.h>
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#include "mbedtls/platform_util.h"
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int uECC_make_key_with_d(uint8_t *public_key, uint8_t *private_key,
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unsigned int *d)
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{
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int ret = UECC_FAULT_DETECTED;
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uECC_word_t _private[NUM_ECC_WORDS];
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uECC_word_t _public[NUM_ECC_WORDS * 2];
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/* This function is designed for test purposes-only (such as validating NIST
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* test vectors) as it uses a provided value for d instead of generating
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* it uniformly at random. */
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if( mbedtls_platform_memcpy (_private, d, NUM_ECC_BYTES) != _private )
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{
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goto exit;
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}
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/* Computing public-key from private: */
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ret = EccPoint_compute_public_key(_public, _private);
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if (ret != UECC_SUCCESS) {
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goto exit;
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}
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/* Converting buffers to correct bit order: */
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uECC_vli_nativeToBytes(private_key,
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BITS_TO_BYTES(NUM_ECC_BITS),
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_private);
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uECC_vli_nativeToBytes(public_key,
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NUM_ECC_BYTES,
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_public);
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uECC_vli_nativeToBytes(public_key + NUM_ECC_BYTES,
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NUM_ECC_BYTES,
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_public + NUM_ECC_WORDS);
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exit:
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/* erasing temporary buffer used to store secret: */
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mbedtls_platform_memset(_private, 0, NUM_ECC_BYTES);
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return ret;
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}
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int uECC_make_key(uint8_t *public_key, uint8_t *private_key)
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{
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int ret = UECC_FAULT_DETECTED;
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uECC_word_t _random[NUM_ECC_WORDS * 2];
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uECC_word_t _private[NUM_ECC_WORDS];
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uECC_word_t _public[NUM_ECC_WORDS * 2];
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uECC_word_t tries;
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volatile uint8_t *public_key_dup = public_key;
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volatile uint8_t *private_key_dup = private_key;
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for (tries = 0; tries < uECC_RNG_MAX_TRIES; ++tries) {
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/* Generating _private uniformly at random: */
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uECC_RNG_Function rng_function = uECC_get_rng();
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if (!rng_function ||
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rng_function((uint8_t *)_random, 2 * NUM_ECC_WORDS*uECC_WORD_SIZE) != 2 * NUM_ECC_WORDS*uECC_WORD_SIZE) {
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return UECC_FAILURE;
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}
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/* computing modular reduction of _random (see FIPS 186.4 B.4.1): */
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uECC_vli_mmod(_private, _random, curve_n);
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/* Computing public-key from private: */
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ret = EccPoint_compute_public_key(_public, _private);
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/* don't try again if a fault was detected */
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if (ret == UECC_FAULT_DETECTED) {
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return ret;
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}
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if (ret == UECC_SUCCESS) {
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/* Converting buffers to correct bit order: */
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uECC_vli_nativeToBytes(private_key,
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BITS_TO_BYTES(NUM_ECC_BITS),
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_private);
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uECC_vli_nativeToBytes(public_key,
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NUM_ECC_BYTES,
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_public);
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uECC_vli_nativeToBytes(public_key + NUM_ECC_BYTES,
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NUM_ECC_BYTES,
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_public + NUM_ECC_WORDS);
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/* erasing temporary buffer that stored secret: */
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mbedtls_platform_memset(_private, 0, NUM_ECC_BYTES);
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if (private_key == private_key_dup && public_key == public_key_dup) {
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return UECC_SUCCESS;
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}
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/* Erase key in case of FI */
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mbedtls_platform_memset(public_key, 0, 2*NUM_ECC_BYTES);
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return UECC_FAULT_DETECTED;
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}
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}
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return UECC_FAILURE;
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}
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int uECC_shared_secret(const uint8_t *public_key, const uint8_t *private_key,
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uint8_t *secret)
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{
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uECC_word_t _public[NUM_ECC_WORDS * 2];
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uECC_word_t _private[NUM_ECC_WORDS];
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wordcount_t num_words = NUM_ECC_WORDS;
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wordcount_t num_bytes = NUM_ECC_BYTES;
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int r = UECC_FAULT_DETECTED;
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/* Converting buffers to correct bit order: */
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uECC_vli_bytesToNative(_private,
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private_key,
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BITS_TO_BYTES(NUM_ECC_BITS));
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uECC_vli_bytesToNative(_public,
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public_key,
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num_bytes);
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uECC_vli_bytesToNative(_public + num_words,
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public_key + num_bytes,
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num_bytes);
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r = EccPoint_mult_safer(_public, _public, _private);
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uECC_vli_nativeToBytes(secret, num_bytes, _public);
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/* erasing temporary buffer used to store secret: */
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if (_private == mbedtls_platform_zeroize(_private, sizeof(_private))) {
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return r;
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}
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return UECC_FAULT_DETECTED;
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}
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