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#ifndef _RIJNDAEL_H_
#define _RIJNDAEL_H_
//
// File : rijndael.h
// Creation date : Sun Nov 5 2000 15:42:14 CEST by Szymon Stefanek
//
// This file is part of the KVirc irc client distribution
// Copyright (C) 1999-2000 Szymon Stefanek (pragma at kvirc dot net)
//
// This program is FREE software. You can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your opinion) any later version.
//
// This program is distributed in the HOPE that it will be USEFUL,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, write to the Free Software Foundation,
// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//
// Another implementation of the Rijndael cipher.
// This is intended to be an easily usable library file.
// Based on the Vincent Rijmen and K.U.Leuven implementation 2.4.
//
//
// Original Copyright notice:
//
// rijndael-alg-fst.c v2.4 April '2000
// rijndael-alg-fst.h
// rijndael-api-fst.c
// rijndael-api-fst.h
//
// Optimised ANSI C code
//
// authors: v1.0: Antoon Bosselaers
// v2.0: Vincent Rijmen, K.U.Leuven
// v2.3: Paulo Barreto
// v2.4: Vincent Rijmen, K.U.Leuven
//
// This code is placed in the public domain.
//
//
// This implementation works on 128 , 192 , 256 bit keys
// and on 128 bit blocks
//
//
// Example of usage:
//
// // Input data
// unsigned char key[32]; // The key
// initializeYour256BitKey(); // Obviously initialized with sth
// const unsigned char * plainText = getYourPlainText(); // Your plain text
// int plainTextLen = strlen(plainText); // Plain text length
//
// // Encrypting
// Rijndael rin;
// unsigned char output[plainTextLen + 16];
//
// rin.init(Rijndael::CBC,Rijndael::Encrypt,key,Rijndael::Key32Bytes);
// // It is a good idea to check the error code
// int len = rin.padEncrypt(plainText,len,output);
// if(len >= 0)useYourEncryptedText();
// else encryptError(len);
//
// // Decrypting: we can reuse the same object
// unsigned char output2[len];
// rin.init(Rijndael::ECB,Rijndael::Decrypt,keyMaterial,Rijndael::Key32Bytes));
// len = rin.padDecrypt(output,len,output2);
// if(len >= 0)useYourDecryptedText();
// else decryptError(len);
//
#include "kvi_settings.h"
#ifdef COMPILE_CRYPT_SUPPORT
#define _MAX_KEY_COLUMNS (256/32)
#define _MAX_ROUNDS 14
//#define BITSPERBLOCK 128 /* Default number of bits in a cipher block */
#define MAX_IV_SIZE 16
// We assume that unsigned int is 32 bits long....
typedef unsigned char UINT8;
typedef unsigned int UINT32;
typedef unsigned short UINT16;
#define RIJNDAEL_SUCCESS 0
#define RIJNDAEL_UNSUPPORTED_MODE -1
#define RIJNDAEL_UNSUPPORTED_DIRECTION -2
#define RIJNDAEL_UNSUPPORTED_KEY_LENGTH -3
#define RIJNDAEL_BAD_KEY -4
#define RIJNDAEL_NOT_INITIALIZED -5
#define RIJNDAEL_BAD_DIRECTION -6
#define RIJNDAEL_CORRUPTED_DATA -7
class Rijndael
{
public:
enum Direction { Encrypt , Decrypt };
enum Mode { ECB , CBC , CFB1 };
enum KeyLength { Key16Bytes , Key24Bytes , Key32Bytes };
Rijndael();
~Rijndael();
protected:
enum State { Valid , Invalid };
State m_state;
Mode m_mode;
Direction m_direction;
UINT8 m_initVector[MAX_IV_SIZE];
UINT32 m_uRounds;
UINT8 m_expandedKey[_MAX_ROUNDS+1][4][4];
public:
// Initializes the crypt session
// Returns RIJNDAEL_SUCCESS or an error code
int init(Mode mode,Direction dir,const UINT8 *key,KeyLength keyLen,UINT8 * initVector = 0);
// Input len is in BITS!
// Encrypts inputLen / 128 blocks of input and puts it in outBuffer
// outBuffer must be at least inputLen / 8 bytes long.
// Returns the encrypted buffer length in BITS or an error code < 0 in case of error
int blockEncrypt(const UINT8 *input, int inputLen, UINT8 *outBuffer);
// Input len is in BYTES!
// outBuffer must be at least inputLen + 16 bytes long
// Returns the encrypted buffer length in BYTES or an error code < 0 in case of error
int padEncrypt(const UINT8 *input, int inputOctets, UINT8 *outBuffer);
// Input len is in BITS!
// outBuffer must be at least inputLen / 8 bytes long
// Returns the decrypted buffer length in BITS and an error code < 0 in case of error
int blockDecrypt(const UINT8 *input, int inputLen, UINT8 *outBuffer);
// Input len is in BYTES!
// outBuffer must be at least inputLen bytes long
// Returns the decrypted buffer length in BYTES and an error code < 0 in case of error
int padDecrypt(const UINT8 *input, int inputOctets, UINT8 *outBuffer);
protected:
void keySched(UINT8 key[_MAX_KEY_COLUMNS][4]);
void keyEncToDec();
void encrypt(const UINT8 a[16], UINT8 b[16]);
void decrypt(const UINT8 a[16], UINT8 b[16]);
};
#endif // COMPILE_CRYPT_SUPPORT
#endif // _RIJNDAEL_H_
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