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T8b949e/*

* 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.

*/

Tff7b72#Tff7b72include T8b949e"CBC.h"

Tff7b72#Tff7b72include T8b949e<Crypto.h>

Tff7b72#Tff7b72include T8b949e<string.h>

T8b949e/**

* \class CBCCommon CBC.h <CBC.h>

* \brief Concrete base class to assist with implementing CBC for

* 128-bit block ciphers.

*

* Reference: http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation

*

* \sa CBC

*/

T8b949e/**

* \brief Constructs a new cipher in CBC mode.

*

* This constructor should be followed by a call to setBlockCipher().

*/

Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3CBCCommonTb4b4b4(Tb4b4b4)

Tff7b72: Te6edf3blockCipherTb4b4b4(T79c0ff0Tb4b4b4)

Tb4b4b4, Te6edf3posnTb4b4b4(T79c0ff16Tb4b4b4)

Tb4b4b4{

Tb4b4b4}

T8b949e/**

* \brief Destroys this cipher object after clearing sensitive information.

*/

Te6edf3CBCCommonTff7b72:Tff7b72:Tff7b72~Te6edf3CBCCommonTb4b4b4(Tb4b4b4)

Tb4b4b4{

Te6edf3cleanTb4b4b4(Te6edf3ivTb4b4b4)Tb4b4b4;

Te6edf3cleanTb4b4b4(Te6edf3tempTb4b4b4)Tb4b4b4;

Tb4b4b4}

Tffa657size_t Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3keySizeTb4b4b4(Tb4b4b4) Tff7b72const

Tb4b4b4{

Tff7b72return Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3keySizeTb4b4b4(Tb4b4b4)Tb4b4b4;

Tb4b4b4}

Tffa657size_t Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3ivSizeTb4b4b4(Tb4b4b4) Tff7b72const

Tb4b4b4{

Tff7b72return T79c0ff16Tb4b4b4;

Tb4b4b4}

Tffa657bool Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3setKeyTb4b4b4(Tff7b72const Tffa657uint8_tTff7b72* Te6edf3keyTb4b4b4, Tffa657size_t Te6edf3lenTb4b4b4)

Tb4b4b4{

T8b949e// Verify the cipher's block size, just in case.

Tff7b72if Tb4b4b4(Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3blockSizeTb4b4b4(Tb4b4b4) Tff7b72!Tff7b72= T79c0ff16Tb4b4b4)

Tff7b72return Tffa657falseTb4b4b4;

T8b949e// Set the key on the underlying block cipher.

Tff7b72return Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3setKeyTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3lenTb4b4b4)Tb4b4b4;

Tb4b4b4}

Tffa657bool Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3setIVTb4b4b4(Tff7b72const Tffa657uint8_tTff7b72* Te6edf3ivTb4b4b4, Tffa657size_t Te6edf3lenTb4b4b4)

Tb4b4b4{

Tff7b72if Tb4b4b4(Te6edf3len Tff7b72!Tff7b72= T79c0ff16Tb4b4b4)

Tff7b72return Tffa657falseTb4b4b4;

Te6edf3memcpyTb4b4b4(Tff7b72thisTff7b72-Tff7b72>Te6edf3ivTb4b4b4, Te6edf3ivTb4b4b4, T79c0ff16Tb4b4b4)Tb4b4b4;

Te6edf3posn Tff7b72= T79c0ff16Tb4b4b4;

Tff7b72return Tffa657trueTb4b4b4;

Tb4b4b4}

Tffa657void Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3encryptTb4b4b4(Tffa657uint8_tTff7b72* Te6edf3outputTb4b4b4, Tff7b72const Tffa657uint8_tTff7b72* Te6edf3inputTb4b4b4, Tffa657size_t Te6edf3lenTb4b4b4)

Tb4b4b4{

Tffa657uint8_t Te6edf3posnTb4b4b4;

Tff7b72while Tb4b4b4(Te6edf3len Tff7b72>Tff7b72= T79c0ff16Tb4b4b4) Tb4b4b4{

Tff7b72for Tb4b4b4(Te6edf3posn Tff7b72= T79c0ff0Tb4b4b4; Te6edf3posn Tff7b72< T79c0ff16Tb4b4b4; Tff7b72+Tff7b72+Te6edf3posnTb4b4b4)

Te6edf3ivTb4b4b4[Te6edf3posnTb4b4b4] Tff7b72^Tff7b72= Tff7b72*Te6edf3inputTff7b72+Tff7b72+Tb4b4b4;

Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3encryptBlockTb4b4b4(Te6edf3ivTb4b4b4, Te6edf3ivTb4b4b4)Tb4b4b4;

Tff7b72for Tb4b4b4(Te6edf3posn Tff7b72= T79c0ff0Tb4b4b4; Te6edf3posn Tff7b72< T79c0ff16Tb4b4b4; Tff7b72+Tff7b72+Te6edf3posnTb4b4b4)

Tff7b72*Te6edf3outputTff7b72+Tff7b72+ Tff7b72= Te6edf3ivTb4b4b4[Te6edf3posnTb4b4b4]Tb4b4b4;

Te6edf3len Tff7b72-Tff7b72= T79c0ff16Tb4b4b4;

Tb4b4b4}

Tb4b4b4}

Tffa657void Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3decryptTb4b4b4(Tffa657uint8_tTff7b72* Te6edf3outputTb4b4b4, Tff7b72const Tffa657uint8_tTff7b72* Te6edf3inputTb4b4b4, Tffa657size_t Te6edf3lenTb4b4b4)

Tb4b4b4{

Tffa657uint8_t Te6edf3posnTb4b4b4;

Tff7b72while Tb4b4b4(Te6edf3len Tff7b72>Tff7b72= T79c0ff16Tb4b4b4) Tb4b4b4{

Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3decryptBlockTb4b4b4(Te6edf3tempTb4b4b4, Te6edf3inputTb4b4b4)Tb4b4b4;

Tff7b72for Tb4b4b4(Te6edf3posn Tff7b72= T79c0ff0Tb4b4b4; Te6edf3posn Tff7b72< T79c0ff16Tb4b4b4; Tff7b72+Tff7b72+Te6edf3posnTb4b4b4) Tb4b4b4{

Tffa657uint8_t Te6edf3in Tff7b72= Tff7b72*Te6edf3inputTff7b72+Tff7b72+Tb4b4b4;

Tff7b72*Te6edf3outputTff7b72+Tff7b72+ Tff7b72= Te6edf3tempTb4b4b4[Te6edf3posnTb4b4b4] Tff7b72^ Te6edf3ivTb4b4b4[Te6edf3posnTb4b4b4]Tb4b4b4;

Te6edf3ivTb4b4b4[Te6edf3posnTb4b4b4] Tff7b72= Te6edf3inTb4b4b4;

Tb4b4b4}

Te6edf3len Tff7b72-Tff7b72= T79c0ff16Tb4b4b4;

Tb4b4b4}

Tb4b4b4}

Tffa657void Te6edf3CBCCommonTff7b72:Tff7b72:Te6edf3clearTb4b4b4(Tb4b4b4)

Tb4b4b4{

Te6edf3blockCipherTff7b72-Tff7b72>Te6edf3clearTb4b4b4(Tb4b4b4)Tb4b4b4;

Te6edf3cleanTb4b4b4(Te6edf3ivTb4b4b4)Tb4b4b4;

Te6edf3cleanTb4b4b4(Te6edf3tempTb4b4b4)Tb4b4b4;

Te6edf3posn Tff7b72= T79c0ff16Tb4b4b4;

Tb4b4b4}

T8b949e/**

* \fn void CBCCommon::setBlockCipher(BlockCipher *cipher)

* \brief Sets the block cipher to use for this CBC object.

*

* \param cipher The block cipher to use to implement CBC mode,

* which must have a block size of 16 bytes (128 bits).

*/

T8b949e/**

* \class CBC CBC.h <CBC.h>

* \brief Implementation of the Cipher Block Chaining (CBC) mode for

* 128-bit block ciphers.

*

* The template parameter T must be a concrete subclass of BlockCipher

* indicating the specific block cipher to use. T must have a block size

* of 16 bytes (128 bits).

*

* For example, the following creates a CBC object using AES192 as the

* underlying cipher:

*

* \code

* CBC<AES192> cbc;

* cbc.setKey(key, 24);

* cbc.setIV(iv, 16);

* cbc.encrypt(output, input, len);

* \endcode

*

* Decryption is similar:

*

* \code

* CBC<AES192> cbc;

* cbc.setKey(key, 24);

* cbc.setIV(iv, 16);

* cbc.decrypt(output, input, len);

* \endcode

*

* The size of the ciphertext will always be the same as the size of

* the plaintext. Also, the length of the plaintext/ciphertext must be a

* multiple of 16. Extra bytes are ignored and not encrypted. The caller

* is responsible for padding the underlying data to a multiple of 16

* using an appropriate padding scheme for the application.

*

* Reference: http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation

*

* \sa CTR, CFB, OFB

*/

T8b949e/**

* \fn CBC::CBC()

* \brief Constructs a new CBC object for the block cipher T.

*/