mirror of
https://github.com/taigrr/arduinolibs
synced 2025-01-18 04:33:12 -08:00
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include "BlockCipher.h"
|
|
|
|
/**
|
|
* \class BlockCipher BlockCipher.h <BlockCipher.h>
|
|
* \brief Abstract base class for block ciphers.
|
|
*
|
|
* Block ciphers always operate in electronic codebook (ECB) mode.
|
|
* Higher-level classes such as CFB128 and CTR128 wrap the block cipher to
|
|
* create more useful classes for encryption and decryption of bulk data.
|
|
*
|
|
* References: http://en.wikipedia.org/wiki/Block_cipher,
|
|
* http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
|
|
*/
|
|
|
|
/**
|
|
* \brief Constructs a block cipher.
|
|
*/
|
|
BlockCipher::BlockCipher()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* \brief Destroys this block cipher object.
|
|
*
|
|
* Subclasses are responsible for clearing temporary key schedules
|
|
* and other buffers so as to avoid leaking sensitive information.
|
|
*
|
|
* \sa clear()
|
|
*/
|
|
BlockCipher::~BlockCipher()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* \fn size_t BlockCipher::blockSize() const
|
|
* \brief Size of a single block processed by this cipher, in bytes.
|
|
*
|
|
* \return Returns the size of a block in bytes.
|
|
*
|
|
* \sa keySize(), encryptBlock()
|
|
*/
|
|
|
|
/**
|
|
* \fn size_t BlockCipher::keySize() const
|
|
* \brief Default size of the key for this block cipher, in bytes.
|
|
*
|
|
* This value indicates the default, or recommended, size for the key.
|
|
*
|
|
* \sa setKey(), blockSize()
|
|
*/
|
|
|
|
/**
|
|
* \fn bool BlockCipher::setKey(const uint8_t *key, size_t len)
|
|
* \brief Sets the key to use for future encryption and decryption operations.
|
|
*
|
|
* \param key The key to use.
|
|
* \param len The length of the key.
|
|
* \return Returns false if the key length is not supported, or the key
|
|
* is somehow "weak" and unusable by this cipher.
|
|
*
|
|
* Use clear() or the destructor to remove the key and any other sensitive
|
|
* data from the object once encryption or decryption is complete.
|
|
*
|
|
* \sa keySize(), clear()
|
|
*/
|
|
|
|
/**
|
|
* \fn void BlockCipher::encryptBlock(uint8_t *output, const uint8_t *input)
|
|
* \brief Encrypts a single block using this cipher.
|
|
*
|
|
* \param output The output buffer to put the ciphertext into.
|
|
* Must be at least blockSize() bytes in length.
|
|
* \param input The input buffer to read the plaintext from which is
|
|
* allowed to overlap with \a output. Must be at least blockSize()
|
|
* bytes in length.
|
|
*
|
|
* \sa decryptBlock(), blockSize()
|
|
*/
|
|
|
|
/**
|
|
* \fn void BlockCipher::decryptBlock(uint8_t *output, const uint8_t *input)
|
|
* \brief Decrypts a single block using this cipher.
|
|
*
|
|
* \param output The output buffer to put the plaintext into.
|
|
* Must be at least blockSize() bytes in length.
|
|
* \param input The input buffer to read the ciphertext from which is
|
|
* allowed to overlap with \a output. Must be at least blockSize()
|
|
* bytes in length.
|
|
*
|
|
* \sa encryptBlock(), blockSize()
|
|
*/
|
|
|
|
/**
|
|
* \fn void BlockCipher::clear()
|
|
* \brief Clears all security-sensitive state from this block cipher.
|
|
*
|
|
* Security-sensitive information includes key schedules and any
|
|
* temporary state that is used by encryptBlock() or decryptBlock()
|
|
* which is stored in the object itself.
|
|
*
|
|
* \sa setKey(), encryptBlock(), decryptBlock()
|
|
*/
|