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Copy pathAEScrypt.cpp
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AEScrypt.cpp
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/*
* File: AEScrypt.cpp
*
* Dependencies: N/A
*
* Purpose: Provides support for the Advanced Encryption Standard (AES) algorithm
*
* Authors: Connor Spangler
*
* Last modified: 2 DEC 13
*
* License: Creative Commons Attribution-NonCommercial 4.0 International License
*/
#include <string>
#include <fstream>
#include <vector>
#include "AEScrypt.h"
/*
* Class: AESdata
*
* Purpose: Contains the private members of class AEScrypt
*/
class AESdata
{
public:
// AES constants
static const unsigned int AES_KEY_SIZE = 16/sizeof(char);
static const unsigned int BLOCK_SIZE = 128;
static const unsigned int WORD_SIZE = 4;
static const unsigned int SBOX_SIZE = 256;
static const unsigned int ROUND_KEYS = 44;
// Tracker variable for current round key
int roundKeyIndex;
// Key container
char* key = new char[AES_KEY_SIZE];
// Encryption/decryption result container
ustring result;
// Container for matrix mapped key
unsigned char keyBlock[WORD_SIZE][WORD_SIZE];
// Container for current round state
unsigned char stateBlock[WORD_SIZE][WORD_SIZE];
// Container for expanded key
unsigned char roundKeys[WORD_SIZE][ROUND_KEYS];
// Lookup tables
const unsigned char sBox[SBOX_SIZE] =
{
0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
};
const unsigned char sBoxInv[SBOX_SIZE] =
{
0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
};
unsigned char galois9[SBOX_SIZE] =
{
0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7,
0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc,
0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01,
0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91,
0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a,
0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa,
0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b,
0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b,
0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0,
0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30,
0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed,
0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d,
0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6,
0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46
};
unsigned char galois11[SBOX_SIZE] =
{
0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69,
0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9,
0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12,
0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2,
0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f,
0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f,
0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4,
0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54,
0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e,
0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e,
0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5,
0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55,
0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68,
0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8,
0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13,
0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3
};
unsigned char galois13[SBOX_SIZE] =
{
0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b,
0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b,
0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0,
0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20,
0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26,
0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6,
0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d,
0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d,
0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91,
0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41,
0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a,
0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa,
0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc,
0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c,
0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47,
0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97
};
unsigned char galois14[SBOX_SIZE] =
{
0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a,
0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba,
0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81,
0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61,
0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7,
0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17,
0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c,
0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc,
0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b,
0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb,
0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0,
0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20,
0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6,
0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56,
0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d,
0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d
};
const unsigned char rCon[11] =
{
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
};
const unsigned int galoisField[WORD_SIZE][WORD_SIZE] =
{
{2, 3, 1, 1},
{1, 2, 3, 1},
{1, 1, 2, 3},
{3, 1, 1, 2}
};
const unsigned int galoisFieldInv[WORD_SIZE][WORD_SIZE] =
{
{14, 11, 13, 9},
{9, 14, 11, 13},
{13, 9, 14, 11},
{11, 13, 9, 14}
};
// AES functions
void eProcess();
void dProcess(bool padded);
void expandKey();
void subBytes();
void shiftRows();
void mixColumns();
void addRoundKey();
void invSubBytes();
void invShiftRows();
void invMixColumns();
void invAddRoundKey();
void popKeyBlock();
void popStateBlock(std::string data);
void popStateBlock(ustring data);
std::vector<unsigned char> getData(std::ifstream& in, std::streampos size);
};
/*
* Constructor: AEScrypt(char* key)
*
* Purpose: Generate AEScrypt object, setting the encryption key
*
* Arguments: User-defined encryption key
*/
AEScrypt::AEScrypt(char* key)
{
AES = new AESdata;
AES->key = key;
AES->roundKeyIndex = 0;
AES->popKeyBlock();
AES->expandKey();
}
/*
* Constructor: AEScrypt()
*
* Purpose: Generate blank AEScrypt object
*
* Arguments: None
*/
AEScrypt::AEScrypt()
{
AES = new AESdata;
}
/*
* Destructor: ~AEScrypt()
*
* Purpose: Deallocate AEScrypt and AESdata memory
*
* Arguments: None
*/
AEScrypt::~AEScrypt()
{
delete AES;
}
/*
* Function: ustring AEScrypt::encrypt(std::ifstream& in)
*
* Purpose: Populate string with data from infile for encryption
*
* Arguments: std::ifstream& in = data infile stream
*
* Returns: Result of data encryption
*/
ustring AEScrypt::encrypt(std::ifstream& in)
{
std::string data;
char ch;
while(in.get(ch))
data.push_back(ch);
return encrypt(data);
}
/*
* Function: ustring AEScrypt::encrypt(std::string in)
*
* Purpose: Partition data and encrypt it
*
* Arguments: std::string in = data to be encrypted
*
* Returns: String containing results of encryption
*/
ustring AEScrypt::encrypt(std::string in)
{
AES->result.clear();
int index = 0;
if(in.length() <= 16) // Fix padding here
{
std::string data;
for(unsigned int i = 0; i < in.length(); i++)
data.push_back(in[i]);
unsigned int pad = 16 - in.length();
for(unsigned int i = in.length(); i < 16; i++)
data.push_back((char)pad);
AES->popStateBlock(data);
AES->eProcess();
}
else
{
for(unsigned int x = 0; x < in.length()/16; x++)
{
std::string data;
for(int i = 0; i < 16; i++, index++)
data.push_back(in[index]);
AES->popStateBlock(data);
AES->eProcess();
}
std::string data;
int empty = in.length()%16;
if(empty)
{
for(int x = 0; x < empty; x++, index++)
data.push_back(in[index]);
for(int fill = 0; fill < 16 - empty; fill++)
data.push_back((unsigned)(16-empty));
AES->popStateBlock(data);
AES->eProcess();
}
}
return AES->result;
}
/*
* Function: ustring AEScrypt::decrypt(std::ifstream& in)
*
* Purpose: Populate ustring with data for decryption
*
* Arguments: std::ifstream& in = data infile stream
*
* Returns: Results of decryption
*/
ustring AEScrypt::decrypt(std::ifstream& in)
{
std::streampos size;
in.seekg(0, std::ios::end);
size = in.tellg();
in.seekg(0, std::ios::beg);
std::vector<unsigned char> data = AES->getData(in, size);
ustring final;
for(int x = 0; x < size; x++)
final.push_back(data[x]);
return decrypt(final);
}
/*
* Function: ustring AEScrypt::decrypt(ustring in)
*
* Purpose: Partition data and decrypt
*
* Arguments: ustring in = data to be decrypted
*
* Returns: ustring containing results of decryption
*/
ustring AEScrypt::decrypt(ustring in)
{
AES->result.clear();
int index = 0;
unsigned int nStates = in.length()/16;
for(unsigned int x = 0; x < nStates; x++)
{
ustring data;
for(int i = 0; i < 16; i++, index++)
data.push_back(in[index]);
AES->popStateBlock(data);
if(x == nStates - 1)
AES->dProcess(true);
else
AES->dProcess(false);
}
return AES->result;
}
/*
* Function: std::string AEScrypt::getKey()
*
* Purpose: Retrieve AES key
*
* Arguments: None
*
* Returns: A string containing the key
*/
std::string AEScrypt::getKey()
{
return AES->key;
}
/*
* Function: void AEScrypt::setKey(char* key)
*
* Purpose: Set AES key and perform key expansion
*
* Arguments: char* key = AES key
*
* Returns: Nothing
*/
void AEScrypt::setKey(char* key)
{
AES->key = key;
AES->popKeyBlock();
AES->expandKey();
}
/*
* Function: void AESdata::eProcess()
*
* Purpose: Perform AES encryption steps
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::eProcess()
{
roundKeyIndex = 0;
addRoundKey();
for(int round = 0; round < 10; round++)
{
subBytes();
shiftRows();
if(round < 9)
mixColumns();
addRoundKey();
}
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
result.push_back((unsigned)stateBlock[y][x]);
return;
}
/*
* Function: void AESdata::dProcess()
*
* Purpose: Perform AES decryption steps
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::dProcess(bool padded)
{
roundKeyIndex = 44;
invAddRoundKey();
unsigned int index = 0;
for(int round = 0; round < 10; round++)
{
invShiftRows();
invSubBytes();
invAddRoundKey();
if(round < 9)
invMixColumns();
}
unsigned int pad = stateBlock[WORD_SIZE-1][WORD_SIZE-1];
unsigned char last = stateBlock[WORD_SIZE-1][WORD_SIZE-1];
bool isPadded = true;
unsigned int padding = 16 - pad;
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++, index++)
if((index >= padding) && (stateBlock[y][x] != last))
isPadded = false;
index = 0;
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++, index++)
{
if(isPadded && padded && (index >= padding)){}
else
result.push_back((unsigned)stateBlock[y][x]);
}
return;
}
/*
* Function: std::vector<unsigned char> AESdata::getData(std::ifstream& in, std::streampos size)
*
* Purpose: Read data from infile and populate vector
*
* Arguments: std::ifstream& in = data infile, std::streampos size = size of data infile
*
* Returns: An unsigned char vector containing the infile data
*/
std::vector<unsigned char> AESdata::getData(std::ifstream& in, std::streampos size)
{
std::vector<unsigned char> data(size);
in.read((char*) &data[0], size);
return data;
}
/*
* Function: void AESdata::expandKey()
*
* Purpose: Use Key Expansion algorithm to convert 4-word key to 44 words
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::expandKey()
{
int index = WORD_SIZE;
while(index < 44)
{
for(int exp = 1; exp < 11; exp++)
{
unsigned char rk0 = roundKeys[0][index-1];
roundKeys[0][index] = roundKeys[1][index-1];
roundKeys[1][index] = roundKeys[2][index-1];
roundKeys[2][index] = roundKeys[3][index-1];
roundKeys[3][index] = rk0;
for(unsigned int i = 0; i < WORD_SIZE; i++)
roundKeys[i][index] = sBox[(int)roundKeys[i][index]];
roundKeys[0][index] ^= rCon[exp];
for(unsigned int i = 0; i < WORD_SIZE; i++)
roundKeys[i][index] ^= roundKeys[i][index-4];
for(int w = 0; w < 3; w++)
{
index++;
for(unsigned int i = 0; i < WORD_SIZE; i++)
roundKeys[i][index] = roundKeys[i][index-1] ^ roundKeys[i][index-4];
}
index++;
}
}
return;
}
/*
* Function: void AESdata::subBytes()
*
* Purpose: Use S-Box lookup table to substitute state block bytes
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::subBytes()
{
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] = sBox[(int)stateBlock[y][x]];
return;
}
/*
* Function: void AESdata::shiftRows()
*
* Purpose: Shift each row of the state block left by the row number (index 0)
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::shiftRows()
{
for(unsigned int y = 1; y < WORD_SIZE; y++)
{
for(unsigned int row = 0; row < y; row++)
{
unsigned char sb0 = stateBlock[y][0];
stateBlock[y][0] = stateBlock[y][1];
stateBlock[y][1] = stateBlock[y][2];
stateBlock[y][2] = stateBlock[y][3];
stateBlock[y][3] = sb0;
}
}
return;
}
/*
* Function: void AESdata::mixColumns()
*
* Purpose: Bitwise mix the columns of the state block
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::mixColumns()
{
int mult = 0;
unsigned char word[WORD_SIZE];
unsigned char newBlock[WORD_SIZE][WORD_SIZE];
unsigned char MSB = 0x80, cell, tCell, fCell;
for(unsigned int x = 0; x < WORD_SIZE; x++)
{
for(unsigned int index = 0; index < WORD_SIZE; index++)
{
for(unsigned int y = 0; y < WORD_SIZE; y++)
{
cell = stateBlock[y][x];
tCell = cell;
mult = galoisField[index][y];
if(mult != 1)
{
cell <<= 1;
if(tCell & MSB)
cell ^= 0x1b;
}
if(mult == 3)
cell ^= tCell;
word[y] = cell;
}
fCell = word[0] ^ word[1] ^ word[2] ^ word[3];
newBlock[index][x] = fCell;
}
}
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] = newBlock[y][x];
return;
}
/*
* Function: void AESdata::addRoundKey()
*
* Purpose: Bitwise XOR round key with the state block
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::addRoundKey()
{
int i = roundKeyIndex;
for(unsigned int x = 0; x < WORD_SIZE; x++, i++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] ^= roundKeys[y][i];
roundKeyIndex = i;
return;
}
/*
* Function: void AESdata::invSubBytes()
*
* Purpose: Use inverted S-Box to substitute the state block bytes
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::invSubBytes()
{
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] = sBoxInv[(int)stateBlock[y][x]];
return;
}
/*
* Function: void AESdata::invShiftRows()
*
* Purpose: Shift rows of state block right by row number (index 0)
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::invShiftRows()
{
for(unsigned int y = 1; y < WORD_SIZE; y++)
{
for(unsigned int row = 0; row < y; row++)
{
unsigned char sb3 = stateBlock[y][3];
stateBlock[y][3] = stateBlock[y][2];
stateBlock[y][2] = stateBlock[y][1];
stateBlock[y][1] = stateBlock[y][0];
stateBlock[y][0] = sb3;
}
}
return;
}
/*
* Function: void AESdata::invMixColumns()
*
* Purpose: Inverted column mixing using Galois field lookup tables
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::invMixColumns()
{
int mult = 0;
unsigned char word[WORD_SIZE];
unsigned char newBlock[WORD_SIZE][WORD_SIZE];
unsigned char cell, fCell;
for(unsigned int x = 0; x < WORD_SIZE; x++)
{
for(unsigned int index = 0; index < WORD_SIZE; index++)
{
for(unsigned int y = 0; y < WORD_SIZE; y++)
{
cell = stateBlock[y][x];
mult = galoisFieldInv[index][y];
if(mult == 9)
{
cell = galois9[(int)cell];
}
else if(mult == 11)
{
cell = galois11[(int)cell];
}
else if(mult == 13)
{
cell = galois13[(int)cell];
}
else
{
cell = galois14[(int)cell];
}
word[y] = cell;
}
fCell = word[0] ^ word[1] ^ word[2] ^ word[3];
newBlock[index][x] = fCell;
}
}
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] = newBlock[y][x];
return;
}
/*
* Function: void AESdata::invAddRoundKey()
*
* Purpose: Bitwise XOR round key with the state block starting from end of expanded key
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::invAddRoundKey()
{
int i = roundKeyIndex - 4;
for(unsigned int x = 0; x < WORD_SIZE; x++, i++)
for(unsigned int y = 0; y < WORD_SIZE; y++)
stateBlock[y][x] ^= roundKeys[y][i];
roundKeyIndex = i - 4;
return;
}
/*
* Function: void AESdata::popKeyBlock()
*
* Purpose: Populate the key block with the user-defined key
*
* Arguments: None
*
* Returns: Nothing
*/
void AESdata::popKeyBlock()
{
unsigned int i = 0;
std::string temp(key);
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++, i++)
roundKeys[y][x] = key[i];
}
/*
* Function: void AESdata::popStateBlock(std::string data)
*
* Purpose: Populate the state block with the current data partition to be encrypted
*
* Arguments: std::string data = data to be encrypted
*
* Returns: Nothing
*/
void AESdata::popStateBlock(std::string data)
{
unsigned int i = 0;
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++, i++)
stateBlock[y][x] = data[i];
}
/*
* Function: void AESdata::popStateBlock(ustring data)
*
* Purpose: Populate the state block with the current data partition to be decrypted
*
* Arguments: ustring data = data to be decrypted
*
* Returns: Nothing
*/
void AESdata::popStateBlock(ustring data)
{
unsigned int i = 0;
for(unsigned int x = 0; x < WORD_SIZE; x++)
for(unsigned int y = 0; y < WORD_SIZE; y++, i++)
stateBlock[y][x] = data[i];
}