| /* |
| * |
| * Copyright (c) 2013-2017 Nest Labs, Inc. |
| * All rights reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * This file implements SHA1 and SHA256 hash functions for the Weave layer. |
| * The implementation is based on the OpenSSL library functions. |
| * This implementation is used when #WEAVE_CONFIG_HASH_IMPLEMENTATION_OPENSSL |
| * is enabled (1). |
| * |
| */ |
| |
| #include <string.h> |
| |
| #include "WeaveCrypto.h" |
| #include "HashAlgos.h" |
| |
| namespace nl { |
| namespace Weave { |
| namespace Platform { |
| namespace Security { |
| |
| #if WEAVE_CONFIG_HASH_IMPLEMENTATION_OPENSSL |
| |
| SHA1::SHA1() |
| { |
| } |
| |
| SHA1::~SHA1() |
| { |
| } |
| |
| void SHA1::Begin() |
| { |
| SHA1_Init(&mSHACtx); |
| } |
| |
| void SHA1::AddData(const uint8_t *data, uint16_t dataLen) |
| { |
| SHA1_Update(&mSHACtx, data, dataLen); |
| } |
| |
| void SHA1::Finish(uint8_t *hashBuf) |
| { |
| SHA1_Final(hashBuf, &mSHACtx); |
| } |
| |
| void SHA1::Reset() |
| { |
| memset(this, 0, sizeof(*this)); |
| } |
| |
| SHA256::SHA256() |
| { |
| } |
| |
| SHA256::~SHA256() |
| { |
| } |
| |
| void SHA256::Begin() |
| { |
| SHA256_Init(&mSHACtx); |
| } |
| |
| void SHA256::AddData(const uint8_t *data, uint16_t dataLen) |
| { |
| SHA256_Update(&mSHACtx, data, dataLen); |
| } |
| |
| void SHA256::Finish(uint8_t *hashBuf) |
| { |
| SHA256_Final(hashBuf, &mSHACtx); |
| } |
| |
| void SHA256::Reset() |
| { |
| memset(this, 0, sizeof(*this)); |
| } |
| |
| #endif // WEAVE_CONFIG_HASH_IMPLEMENTATION_OPENSSL |
| |
| #if WEAVE_WITH_OPENSSL |
| |
| /** |
| * Add an OpenSSL BIGNUM value to the hash. |
| * |
| * @note |
| * The input value to the hash for BIGNUMs consists of a single sign byte |
| * (00 for positive, FF for negative) followed by the absolute value of the |
| * number, encoded big endian, in the minimum number of bytes. |
| * |
| */ |
| void SHA1::AddData(const BIGNUM& num) |
| { |
| if (BN_is_zero(&num)) |
| { |
| uint8_t z[2]; |
| z[0] = 0; |
| z[1] = 0; |
| AddData(z, 2); |
| } |
| else |
| { |
| int bnSize = BN_num_bytes(&num); |
| uint8_t *encodedNum = (uint8_t *)OPENSSL_malloc(bnSize + 1); |
| |
| encodedNum[0] = (BN_is_negative(&num)) ? 0xFF : 0x00; |
| |
| BN_bn2bin(&num, encodedNum + 1); |
| |
| AddData(encodedNum, bnSize + 1); |
| |
| OPENSSL_free(encodedNum); |
| } |
| } |
| |
| /** |
| * Add an OpenSSL BIGNUM value to the hash. |
| * |
| * @note |
| * The input value to the hash for BIGNUMs consists of a single sign byte |
| * (00 for positive, FF for negative) followed by the absolute value of the |
| * number, encoded big endian, in the minimum number of bytes. |
| * |
| */ |
| void SHA256::AddData(const BIGNUM& num) |
| { |
| if (BN_is_zero(&num)) |
| { |
| uint8_t z[2]; |
| z[0] = 0; |
| z[1] = 0; |
| AddData(z, 2); |
| } |
| else |
| { |
| int bnSize = BN_num_bytes(&num); |
| uint8_t *encodedNum = (uint8_t *)OPENSSL_malloc(bnSize + 1); |
| |
| encodedNum[0] = (BN_is_negative(&num)) ? 0xFF : 0x00; |
| |
| BN_bn2bin(&num, encodedNum + 1); |
| |
| AddData(encodedNum, bnSize + 1); |
| |
| OPENSSL_free(encodedNum); |
| } |
| } |
| |
| #endif // WEAVE_WITH_OPENSSL |
| |
| } /* namespace Security */ |
| } /* namespace Platform */ |
| } /* namespace Weave */ |
| } /* namespace nl */ |