AES advanced encryption standard

// advanced encryption standard
// author: karl malbrain, malbrain@yahoo.com

typedef unsigned char uchar;
#include <string.h>
#include <memory.h>

// AES only supports Nb=4
#define Nb 4            // number of columns in the state & expanded key

#define Nk 4            // number of columns in a key
#define Nr 10            // number of rounds in encryption

uchar Sbox[256] = {        // forward s-box
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};

uchar InvSbox[256] = {    // inverse s-box
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};

// combined Xtimes2[Sbox[]]
uchar Xtime2Sbox[256] = {
0xc6, 0xf8, 0xee, 0xf6, 0xff, 0xd6, 0xde, 0x91, 0x60, 0x02, 0xce, 0x56, 0xe7, 0xb5, 0x4d, 0xec, 
0x8f, 0x1f, 0x89, 0xfa, 0xef, 0xb2, 0x8e, 0xfb, 0x41, 0xb3, 0x5f, 0x45, 0x23, 0x53, 0xe4, 0x9b, 
0x75, 0xe1, 0x3d, 0x4c, 0x6c, 0x7e, 0xf5, 0x83, 0x68, 0x51, 0xd1, 0xf9, 0xe2, 0xab, 0x62, 0x2a, 
0x08, 0x95, 0x46, 0x9d, 0x30, 0x37, 0x0a, 0x2f, 0x0e, 0x24, 0x1b, 0xdf, 0xcd, 0x4e, 0x7f, 0xea, 
0x12, 0x1d, 0x58, 0x34, 0x36, 0xdc, 0xb4, 0x5b, 0xa4, 0x76, 0xb7, 0x7d, 0x52, 0xdd, 0x5e, 0x13, 
0xa6, 0xb9, 0x00, 0xc1, 0x40, 0xe3, 0x79, 0xb6, 0xd4, 0x8d, 0x67, 0x72, 0x94, 0x98, 0xb0, 0x85, 
0xbb, 0xc5, 0x4f, 0xed, 0x86, 0x9a, 0x66, 0x11, 0x8a, 0xe9, 0x04, 0xfe, 0xa0, 0x78, 0x25, 0x4b, 
0xa2, 0x5d, 0x80, 0x05, 0x3f, 0x21, 0x70, 0xf1, 0x63, 0x77, 0xaf, 0x42, 0x20, 0xe5, 0xfd, 0xbf, 
0x81, 0x18, 0x26, 0xc3, 0xbe, 0x35, 0x88, 0x2e, 0x93, 0x55, 0xfc, 0x7a, 0xc8, 0xba, 0x32, 0xe6, 
0xc0, 0x19, 0x9e, 0xa3, 0x44, 0x54, 0x3b, 0x0b, 0x8c, 0xc7, 0x6b, 0x28, 0xa7, 0xbc, 0x16, 0xad, 
0xdb, 0x64, 0x74, 0x14, 0x92, 0x0c, 0x48, 0xb8, 0x9f, 0xbd, 0x43, 0xc4, 0x39, 0x31, 0xd3, 0xf2, 
0xd5, 0x8b, 0x6e, 0xda, 0x01, 0xb1, 0x9c, 0x49, 0xd8, 0xac, 0xf3, 0xcf, 0xca, 0xf4, 0x47, 0x10, 
0x6f, 0xf0, 0x4a, 0x5c, 0x38, 0x57, 0x73, 0x97, 0xcb, 0xa1, 0xe8, 0x3e, 0x96, 0x61, 0x0d, 0x0f, 
0xe0, 0x7c, 0x71, 0xcc, 0x90, 0x06, 0xf7, 0x1c, 0xc2, 0x6a, 0xae, 0x69, 0x17, 0x99, 0x3a, 0x27, 
0xd9, 0xeb, 0x2b, 0x22, 0xd2, 0xa9, 0x07, 0x33, 0x2d, 0x3c, 0x15, 0xc9, 0x87, 0xaa, 0x50, 0xa5, 
0x03, 0x59, 0x09, 0x1a, 0x65, 0xd7, 0x84, 0xd0, 0x82, 0x29, 0x5a, 0x1e, 0x7b, 0xa8, 0x6d, 0x2c 
};

// combined Xtimes3[Sbox[]]
uchar Xtime3Sbox[256] = {
0xa5, 0x84, 0x99, 0x8d, 0x0d, 0xbd, 0xb1, 0x54, 0x50, 0x03, 0xa9, 0x7d, 0x19, 0x62, 0xe6, 0x9a, 
0x45, 0x9d, 0x40, 0x87, 0x15, 0xeb, 0xc9, 0x0b, 0xec, 0x67, 0xfd, 0xea, 0xbf, 0xf7, 0x96, 0x5b, 
0xc2, 0x1c, 0xae, 0x6a, 0x5a, 0x41, 0x02, 0x4f, 0x5c, 0xf4, 0x34, 0x08, 0x93, 0x73, 0x53, 0x3f, 
0x0c, 0x52, 0x65, 0x5e, 0x28, 0xa1, 0x0f, 0xb5, 0x09, 0x36, 0x9b, 0x3d, 0x26, 0x69, 0xcd, 0x9f, 
0x1b, 0x9e, 0x74, 0x2e, 0x2d, 0xb2, 0xee, 0xfb, 0xf6, 0x4d, 0x61, 0xce, 0x7b, 0x3e, 0x71, 0x97, 
0xf5, 0x68, 0x00, 0x2c, 0x60, 0x1f, 0xc8, 0xed, 0xbe, 0x46, 0xd9, 0x4b, 0xde, 0xd4, 0xe8, 0x4a, 
0x6b, 0x2a, 0xe5, 0x16, 0xc5, 0xd7, 0x55, 0x94, 0xcf, 0x10, 0x06, 0x81, 0xf0, 0x44, 0xba, 0xe3, 
0xf3, 0xfe, 0xc0, 0x8a, 0xad, 0xbc, 0x48, 0x04, 0xdf, 0xc1, 0x75, 0x63, 0x30, 0x1a, 0x0e, 0x6d, 
0x4c, 0x14, 0x35, 0x2f, 0xe1, 0xa2, 0xcc, 0x39, 0x57, 0xf2, 0x82, 0x47, 0xac, 0xe7, 0x2b, 0x95, 
0xa0, 0x98, 0xd1, 0x7f, 0x66, 0x7e, 0xab, 0x83, 0xca, 0x29, 0xd3, 0x3c, 0x79, 0xe2, 0x1d, 0x76, 
0x3b, 0x56, 0x4e, 0x1e, 0xdb, 0x0a, 0x6c, 0xe4, 0x5d, 0x6e, 0xef, 0xa6, 0xa8, 0xa4, 0x37, 0x8b, 
0x32, 0x43, 0x59, 0xb7, 0x8c, 0x64, 0xd2, 0xe0, 0xb4, 0xfa, 0x07, 0x25, 0xaf, 0x8e, 0xe9, 0x18, 
0xd5, 0x88, 0x6f, 0x72, 0x24, 0xf1, 0xc7, 0x51, 0x23, 0x7c, 0x9c, 0x21, 0xdd, 0xdc, 0x86, 0x85, 
0x90, 0x42, 0xc4, 0xaa, 0xd8, 0x05, 0x01, 0x12, 0xa3, 0x5f, 0xf9, 0xd0, 0x91, 0x58, 0x27, 0xb9, 
0x38, 0x13, 0xb3, 0x33, 0xbb, 0x70, 0x89, 0xa7, 0xb6, 0x22, 0x92, 0x20, 0x49, 0xff, 0x78, 0x7a, 
0x8f, 0xf8, 0x80, 0x17, 0xda, 0x31, 0xc6, 0xb8, 0xc3, 0xb0, 0x77, 0x11, 0xcb, 0xfc, 0xd6, 0x3a 
};

// modular multiplication tables
// based on:

// Xtime2[x] = (x & 0x80 ? 0x1b : 0) ^ (x + x)
// Xtime3[x] = x^Xtime2[x];

uchar Xtime2[256] = {
0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 
0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 
0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 
0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 
0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 
0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 
0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, 
0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 
0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05, 
0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, 
0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 
0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, 
0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 
0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 
0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, 
0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5}; 

uchar Xtime9[256] = {
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};

uchar XtimeB[256] = {
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}; 

uchar XtimeD[256] = {
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}; 

uchar XtimeE[256] = {
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}; 

// exchanges columns in each of 4 rows
// row0 - unchanged, row1- shifted left 1, 
// row2 - shifted left 2 and row3 - shifted left 3
void ShiftRows (uchar *state, uchar *out)
{
    // just substitute row 0
    out[0] = Sbox[state[0]], out[4] = Sbox[state[4]];
    out[8] = Sbox[state[8]], out[12] = Sbox[state[12]];

    // rotate row 1
    out[1] = Sbox[state[5]], out[5] = Sbox[state[9]];
    out[9] = Sbox[state[13]], out[13] = Sbox[state[1]];

    // rotate row 2
    out[2] = Sbox[state[10]], out[10] = Sbox[state[2]];
    out[6] = Sbox[state[14]], out[14] = Sbox[state[6]];

    // rotate row 3
    out[15] = Sbox[state[11]], out[11] = Sbox[state[7]];
    out[7] = Sbox[state[3]], out[3] = Sbox[state[15]];
}

// restores columns in each of 4 rows
// row0 - unchanged, row1- shifted right 1, 
// row2 - shifted right 2 and row3 - shifted right 3
void InvShiftRows (uchar *state, uchar *out)
{
    // restore row 0
    out[0] = InvSbox[state[0]], out[4] = InvSbox[state[4]];
    out[8] = InvSbox[state[8]], out[12] = InvSbox[state[12]];

    // restore row 1
    out[13] = InvSbox[state[9]], out[9] = InvSbox[state[5]];
    out[5] = InvSbox[state[1]], out[1] = InvSbox[state[13]];

    // restore row 2
    out[2] = InvSbox[state[10]], out[10] = InvSbox[state[2]];
    out[6] = InvSbox[state[14]], out[14] = InvSbox[state[6]];

    // restore row 3
    out[3] = InvSbox[state[7]], out[7] = InvSbox[state[11]];
    out[11] = InvSbox[state[15]], out[15] = InvSbox[state[3]];
}

uchar Rcon[11] = {
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};

// produce Nb bytes for each round
void ExpandKey (uchar *key, uchar *expkey)
{
uchar tmp0, tmp1, tmp2, tmp3, tmp4;
int idx;

    memcpy (expkey, key, Nk * 4);

    for( idx = Nk; idx < Nb * (Nr + 1); idx++ ) {
        tmp0 = expkey[4*idx - 4];
        tmp1 = expkey[4*idx - 3];
        tmp2 = expkey[4*idx - 2];
        tmp3 = expkey[4*idx - 1];
        if( !(idx % Nk) ) {
            tmp4 = tmp3;
            tmp3 = Sbox[tmp0];
            tmp0 = Sbox[tmp1] ^ Rcon[idx/Nk];
            tmp1 = Sbox[tmp2];
            tmp2 = Sbox[tmp4];
        } else if( Nk > 6 && idx % Nk == 4 ) {
            tmp0 = Sbox[tmp0];
            tmp1 = Sbox[tmp1];
            tmp2 = Sbox[tmp2];
            tmp3 = Sbox[tmp3];
        }

        expkey[4*idx+0] = expkey[4*idx - 4*Nk + 0] ^ tmp0;
        expkey[4*idx+1] = expkey[4*idx - 4*Nk + 1] ^ tmp1;
        expkey[4*idx+2] = expkey[4*idx - 4*Nk + 2] ^ tmp2;
        expkey[4*idx+3] = expkey[4*idx - 4*Nk + 3] ^ tmp3;
    }
}

// encrypt/decrypt columns of the key

#define AddRoundKey(state, key, out)
do {
    out[0] = state[0] ^ key[0];
    out[1] = state[1] ^ key[1];
    out[2] = state[2] ^ key[2];
    out[3] = state[3] ^ key[3];
    out[4] = state[4] ^ key[4];
    out[5] = state[5] ^ key[5];
    out[6] = state[6] ^ key[6];
    out[7] = state[7] ^ key[7];
    out[8] = state[8] ^ key[8];
    out[9] = state[9] ^ key[9];
    out[10] = state[10] ^ key[10];
    out[11] = state[11] ^ key[11];
    out[12] = state[12] ^ key[12];
    out[13] = state[13] ^ key[13];
    out[14] = state[14] ^ key[14];
    out[15] = state[15] ^ key[15];
} while(0)

// recombine and mix each row in a column
#define MixSubColumns(state, out, key)
do {
    /* mixing column 0*/
    out[0] = Xtime2Sbox[state[0]] ^ Xtime3Sbox[state[5]] ^ Sbox[state[10]] ^ Sbox[state[15]] ^ key[0];
    out[1] = Sbox[state[0]] ^ Xtime2Sbox[state[5]] ^ Xtime3Sbox[state[10]] ^ Sbox[state[15]] ^ key[1];
    out[2] = Sbox[state[0]] ^ Sbox[state[5]] ^ Xtime2Sbox[state[10]] ^ Xtime3Sbox[state[15]] ^ key[2];
    out[3] = Xtime3Sbox[state[0]] ^ Sbox[state[5]] ^ Sbox[state[10]] ^ Xtime2Sbox[state[15]] ^ key[3];

    /* mixing column 1*/
    out[4] = Xtime2Sbox[state[4]] ^ Xtime3Sbox[state[9]] ^ Sbox[state[14]] ^ Sbox[state[3]] ^ key[4];
    out[5] = Sbox[state[4]] ^ Xtime2Sbox[state[9]] ^ Xtime3Sbox[state[14]] ^ Sbox[state[3]] ^ key[5];
    out[6] = Sbox[state[4]] ^ Sbox[state[9]] ^ Xtime2Sbox[state[14]] ^ Xtime3Sbox[state[3]] ^ key[6];
    out[7] = Xtime3Sbox[state[4]] ^ Sbox[state[9]] ^ Sbox[state[14]] ^ Xtime2Sbox[state[3]] ^ key[7];

    /* mixing column 2*/
    out[8] = Xtime2Sbox[state[8]] ^ Xtime3Sbox[state[13]] ^ Sbox[state[2]] ^ Sbox[state[7]] ^ key[8];
    out[9] = Sbox[state[8]] ^ Xtime2Sbox[state[13]] ^ Xtime3Sbox[state[2]] ^ Sbox[state[7]] ^ key[9];
    out[10]  = Sbox[state[8]] ^ Sbox[state[13]] ^ Xtime2Sbox[state[2]] ^ Xtime3Sbox[state[7]] ^ key[10];
    out[11]  = Xtime3Sbox[state[8]] ^ Sbox[state[13]] ^ Sbox[state[2]] ^ Xtime2Sbox[state[7]] ^ key[11];

    /* mixing column 3*/
    out[12] = Xtime2Sbox[state[12]] ^ Xtime3Sbox[state[1]] ^ Sbox[state[6]] ^ Sbox[state[11]] ^ key[12];
    out[13] = Sbox[state[12]] ^ Xtime2Sbox[state[1]] ^ Xtime3Sbox[state[6]] ^ Sbox[state[11]] ^ key[13];
    out[14] = Sbox[state[12]] ^ Sbox[state[1]] ^ Xtime2Sbox[state[6]] ^ Xtime3Sbox[state[11]] ^ key[14];
    out[15] = Xtime3Sbox[state[12]] ^ Sbox[state[1]] ^ Sbox[state[6]] ^ Xtime2Sbox[state[11]] ^ key[15];
} while(0)

// encrypt one 128 bit block
void Encrypt (uchar *in, uchar *expkey, uchar *out)
{
uchar state[Nb * 4], tmp[Nb * 4];

    AddRoundKey (in, expkey, state);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;

    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;

    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;

    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;

    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;

#if (Nr > 10)
    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;
#endif

#if (Nr > 12)
    MixSubColumns (tmp, state, expkey);
    expkey += Nb * 4;

    MixSubColumns (state, tmp, expkey);
    expkey += Nb * 4;
#endif

    ShiftRows (tmp, state);
    AddRoundKey (state, expkey, out);
}

// restore and un-mix each row in a column
#define InvMixSubColumns(state, out, key)
do {
    /* restore column 0*/
    t0 = state[0] ^ key[0];
    t1 = state[1] ^ key[1];
    t2 = state[2] ^ key[2];
    t3 = state[3] ^ key[3];
    out[0] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];
    out[5] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];
    out[10] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];
    out[15] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];

    /* restore column 1*/
    t0 = state[4] ^ key[4];
    t1 = state[5] ^ key[5];
    t2 = state[6] ^ key[6];
    t3 = state[7] ^ key[7];
    out[4] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];
    out[9] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];
    out[14] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];
    out[3] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];

    /* restore column 2*/
    t0 = state[8] ^ key[8];
    t1 = state[9] ^ key[9];
    t2 = state[10] ^ key[10];
    t3 = state[11] ^ key[11];
    out[8] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];
    out[13] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];
    out[2]  = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];
    out[7]  = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];

    /* restore column 3*/
    t0 = state[12] ^ key[12];
    t1 = state[13] ^ key[13];
    t2 = state[14] ^ key[14];
    t3 = state[15] ^ key[15];
    out[12] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];
    out[1] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];
    out[6] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];
    out[11] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];
} while(0)

void Decrypt (uchar *in, uchar *expkey, uchar *out)
{
uchar state[Nb * 4], tmp[Nb * 4];
uchar t0, t1, t2, t3;

    expkey += Nr * Nb * 4;
    AddRoundKey (in, expkey, tmp);
    InvShiftRows(tmp, state);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);

#if (Nr > 10)
    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);
#endif

#if (Nr > 12)
    expkey -= Nb * 4;
    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * 4;
    InvMixSubColumns (state, tmp, expkey);
#endif

    expkey -= Nb * 4;
    AddRoundKey (tmp, expkey, out);
}

#include <stdio.h>
#include <fcntl.h>
uchar in[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};

uchar key[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f};

uchar out[16];

#ifndef unix
void rd_clock (__int64 *ans)
{
unsigned dwLow, dwHigh;

    __asm {
        rdtsc
        mov dwLow, eax
        mov dwHigh, edx
    }
    *ans = (__int64)dwHigh << 32 | (__int64)dwLow;
}
#else
typedef long long __int64;

void rd_clock (__int64 *ans)
{
unsigned long long dwBoth;

    __asm__ volatile(".byte 0x0f, 0x31" : "=A"(dwBoth)); 
    *ans = dwBoth;
}
#endif

uchar samplekey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab,
0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};

uchar samplein[] = {0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31,
0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34};

void sample ()
{
uchar expkey[4 * Nb * (Nr + 1)];
int idx, diff;
__int64 start, stop;

    ExpandKey (samplekey, expkey);
    Encrypt (samplein, expkey, out);

    rd_clock(&start);

    Encrypt (samplein, expkey, out);

    rd_clock(&stop);
    diff = stop - start;
    printf ("encrypt time: %d, %d cycles per byte
", diff, diff/16);

    for( idx = 0; idx < 16; idx++ )
        printf ("%.2x ", out[idx]);

    printf ("
");
    Decrypt (out, expkey, in);
    rd_clock(&start);
    Decrypt (out, expkey, in);

    rd_clock(&stop);
    diff = stop - start;
    printf ("decrypt time: %d, %d cycles per byte
", diff, diff/16);

    for( idx = 0; idx < 16; idx++ )
        printf ("%.2x ", in[idx]);

    printf ("
");
}

void certify ()
{
uchar expkey[4 * Nb * (Nr + 1)];
int idx, diff;
__int64 start, stop;

    ExpandKey (key, expkey);
    Encrypt (in, expkey, out);

    rd_clock(&start);

    Encrypt (in, expkey, out);

    rd_clock(&stop);
    diff = stop - start;
    printf ("encrypt time: %d, %d cycles per byte
", diff, diff/16);

    for( idx = 0; idx < 16; idx++ )
        printf ("%.2x ", out[idx]);

    printf ("
");
    Decrypt (out, expkey, in);
    rd_clock(&start);
    Decrypt (out, expkey, in);

    rd_clock(&stop);
    diff = stop - start;
    printf ("decrypt time: %d, %d cycles per byte
", diff, diff/16);

    for( idx = 0; idx < 16; idx++ )
        printf ("%.2x ", in[idx]);

    printf ("
");
}

void decrypt (char *mykey, char *name)
{
uchar expkey[4 * Nb * (Nr + 1)];
FILE *fd = fopen (name, "rb");
int ch, idx = 0;

    strncpy (key, mykey, sizeof(key));
    ExpandKey (key, expkey);

    while( ch = getc(fd), ch != EOF ) {
        in[idx++] = ch;
        if( idx % 16 )
            continue;

        Decrypt (in, expkey, out);

        for( idx = 0; idx < 16; idx++ )
            putchar (out[idx]);
        idx = 0;
    }
}

void encrypt (char *mykey, char *name)
{
uchar expkey[4 * Nb * (Nr + 1)];
FILE *fd = fopen (name, "rb");
int ch, idx = 0;

    strncpy (key, mykey, sizeof(key));
    ExpandKey (key, expkey);

    while( ch = getc(fd), ch != EOF ) {
        in[idx++] = ch;
        if( idx % 16 )
            continue;

        Encrypt (in, expkey, out);

        for( idx = 0; idx < 16; idx++ )
            putchar (out[idx]);
        idx = 0;
    }

    if( idx )
      while( idx % 16 )
        in[idx++] = 0;
    else
      return;

    Encrypt (in, expkey, out);

    for( idx = 0; idx < 16; idx++ )
        putchar (out[idx]);
}

uchar expkey[4 * Nb * (Nr + 1)];
void mrandom (int, char *);
unsigned xrandom (void);

int aescycles ()
{
__int64 start, end;
int t;

    do {
        rd_clock(&start);
        Encrypt (in, expkey, out);
        rd_clock (&end);
        t = end - start;
    } while( t<= 0 || t>= 4000);
    return t;
}

int bestx (int b, int loops)
{
int bestx = 0, bestxt = 0;
int x, xt, i, j;

    for( x = 0; x < 256; x++ ) {
        xt = 0;
        for( i = 0; i < loops; i++ ) {
            for( j = 0; j < 16; j++ )
                in[j] = xrandom() >> 16;
            in[b] = x;
            xt += aescycles(); xt += aescycles(); xt += aescycles();
            xt += aescycles(); xt += aescycles();
        }
        if( xt > bestxt )
            bestx = x, bestxt = xt;
    }
    return bestx;
}

void bernstein (char *seed)
{
int loops, b, j, k;

    mrandom (strlen(seed), seed);

    for( loops = 4; loops <= 65536; loops *= 16) {
        for( b = 0; b < 16; b++ ) {
            printf ("%.2d, %.5d loops:", b, loops);
            for( k = 0; k < 10; k++ ) {
                for( j = 0; j < 16; j++ )
                    key[j] = xrandom() >> 16;
                ExpandKey (key, expkey);
                printf (" %.2x", bestx (b, loops) ^ key[b]);
                fflush (stdout);
            }
            printf ("
");
        }
    }
}

void tables()
{
int i;

    for( i = 0; i < 256; i++)
    {
        printf("0x%.2x, ", Sbox[i] ^ Xtime2[Sbox[i]]);
        if( !((i+1) % 16) )
            printf("
");
    }

    printf("
");

    for( i = 0; i < 256; i++)
    {
        printf("0x%.2x, ", Xtime2[Sbox[i]]);
        if ( !((i+1) % 16) )
            printf("
");
    }
}

int main (int argc, char *argv[])
{
#ifndef unix
extern int __cdecl _setmode (int, int);

    _setmode (_fileno(stdout), _O_BINARY);
#endif

    switch( argv[1][0] ) {
    case 'c': certify(); break;
    case 'e': encrypt(argv[2], argv[3]); break;
    case 'd': decrypt(argv[2], argv[3]); break;
    case 'b': bernstein(argv[2]);    break;
    case 's': sample(); break;
    case 't': tables(); break;
    }
}

/*
 * The package generates far better random numbers than a linear
 * congruential generator.  The random number generation technique
 * is a linear feedback shift register approach.  In this approach,
 * the least significant bit of all the numbers in the RandTbl table
 * will act as a linear feedback shift register, and will have period
 * of approximately 2^96 - 1.
 *
 */

#define RAND_order (7 * sizeof(unsigned))
#define RAND_size (96 * sizeof(unsigned))

uchar RandTbl[RAND_size + RAND_order];
int RandHead = 0;

/*
 * random:     x**96 + x**7 + x**6 + x**4 + x**3 + x**2 + 1
 *
 * The basic operation is to add to the number at the head index
 * the XOR sum of the lower order terms in the polynomial.
 * Then the index is advanced to the next location cyclically
 * in the table.  The value returned is the sum generated.
 *
 */

unsigned xrandom ()
{
register unsigned fact;

    if( (RandHead -= sizeof(unsigned)) < 0 ) {
        RandHead = RAND_size - sizeof(unsigned);
        memcpy (RandTbl + RAND_size, RandTbl, RAND_order);
    }

    fact = *(unsigned *)(RandTbl + RandHead + 7 * sizeof(unsigned));
    fact ^= *(unsigned *)(RandTbl + RandHead + 6 * sizeof(unsigned));
    fact ^= *(unsigned *)(RandTbl + RandHead + 4 * sizeof(unsigned));
    fact ^= *(unsigned *)(RandTbl + RandHead + 3 * sizeof(unsigned));
    fact ^= *(unsigned *)(RandTbl + RandHead + 2 * sizeof(unsigned));
    return *(unsigned *)(RandTbl + RandHead) += fact;
}

/*
 * mrandom:
 *         Initialize the random number generator based on the given seed.
 *
 */

void mrandom (int len, char *ptr)
{
unsigned short rand = *ptr;
int idx, bit = len * 4;

    memset (RandTbl, 0, sizeof(RandTbl));
    RandHead = 0;

    while( rand *= 20077, rand += 11, bit-- )
        if( ptr[bit >> 2] & (1 << (bit & 3)) )
            for (idx = 0; idx < 5; idx++) {
                rand *= 20077, rand += 11;
                RandTbl[rand % 96 << 2] ^= 1;
            }

    for( idx = 0; idx < 96 * 63; idx++ )
        xrandom ();
}