mirror of
https://github.com/taigrr/arduinolibs
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108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
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* Copyright (C) 2018 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "NoiseCipherState_AESGCM.h"
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#include "Crypto.h"
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#include <string.h>
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/**
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* \class NoiseCipherState_AESGCM NoiseCipherState_AESGCM.h <NoiseCipherState_AESGCM.h>
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* \brief Implementation of the AESGCM cipher
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*/
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/**
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* \brief Constructs a new AESGCM cipher object.
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*
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* \param key The 256-bit key for the cipher object.
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*/
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NoiseCipherState_AESGCM::NoiseCipherState_AESGCM(const uint8_t key[32])
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{
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cipher.setKey(key, 32);
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n = 0;
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}
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/**
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* \brief Destroys this AESGCM cipher object.
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*/
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NoiseCipherState_AESGCM::~NoiseCipherState_AESGCM()
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{
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clean(&n, sizeof(n));
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}
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void NoiseCipherState_AESGCM::setNonce(uint64_t nonce)
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{
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n = nonce;
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}
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// Import from NoiseSymmetricState_AESGCM_SHA256.cpp.
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void noiseAESGCMFormatIV(uint8_t iv[12], uint64_t n);
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int NoiseCipherState_AESGCM::encryptPacket
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(void *output, size_t outputSize, const void *input, size_t inputSize)
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{
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if (outputSize < 16 || (outputSize - 16) < inputSize)
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return -1;
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uint8_t iv[12];
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noiseAESGCMFormatIV(iv, n);
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cipher.setIV(iv, sizeof(iv));
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cipher.encrypt((uint8_t *)output, (const uint8_t *)input, inputSize);
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cipher.computeTag(((uint8_t *)output) + inputSize, 16);
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++n;
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return inputSize + 16;
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}
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int NoiseCipherState_AESGCM::decryptPacket
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(void *output, size_t outputSize, const void *input, size_t inputSize)
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{
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if (inputSize < 16 || outputSize < (inputSize - 16))
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return -1;
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uint8_t iv[12];
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noiseAESGCMFormatIV(iv, n);
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cipher.setIV((const uint8_t *)&iv, sizeof(iv));
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cipher.decrypt((uint8_t *)output, (const uint8_t *)input, outputSize);
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if (cipher.checkTag(((const uint8_t *)input) + outputSize, 16)) {
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++n;
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return outputSize;
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}
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memset(output, 0, outputSize); // Destroy the output if the tag is invalid.
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return -1;
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}
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void NoiseCipherState_AESGCM::rekey()
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{
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uint8_t k[32];
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static uint8_t const iv[12] = {
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0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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memset(k, 0, sizeof(k));
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cipher.setIV(iv, sizeof(iv));
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cipher.encrypt(k, k, sizeof(k));
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cipher.setKey(k, sizeof(k));
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clean(k);
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}
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void NoiseCipherState_AESGCM::clear()
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{
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cipher.clear();
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n = 0;
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}
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