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[] = {        // 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[] = {    // 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[] = {

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[] = {

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[] = {

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[] = {

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[] = {

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[] = {

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[] = {

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[] = Sbox[state[]], out[] = Sbox[state[]];

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    // rotate row 1

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    // rotate row 2

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    // rotate row 3

    out[] = Sbox[state[]], out[] = Sbox[state[]];

    out[] = Sbox[state[]], out[] = Sbox[state[]];

}

// 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[] = InvSbox[state[]], out[] = InvSbox[state[]];

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    // restore row 1

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    // restore row 2

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    // restore row 3

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

    out[] = InvSbox[state[]], out[] = InvSbox[state[]];

}

uchar Rcon[] = {

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 * );

    for( idx = Nk; idx < Nb * (Nr + ); idx++ ) {

        tmp0 = expkey[*idx - ];

        tmp1 = expkey[*idx - ];

        tmp2 = expkey[*idx - ];

        tmp3 = expkey[*idx - ];

        if( !(idx % Nk) ) {

            tmp4 = tmp3;

            tmp3 = Sbox[tmp0];

            tmp0 = Sbox[tmp1] ^ Rcon[idx/Nk];

            tmp1 = Sbox[tmp2];

            tmp2 = Sbox[tmp4];

        } else if( Nk >  && idx % Nk ==  ) {

            tmp0 = Sbox[tmp0];

            tmp1 = Sbox[tmp1];

            tmp2 = Sbox[tmp2];

            tmp3 = Sbox[tmp3];

        }

        expkey[*idx+] = expkey[*idx - *Nk + ] ^ tmp0;

        expkey[*idx+] = expkey[*idx - *Nk + ] ^ tmp1;

        expkey[*idx+] = expkey[*idx - *Nk + ] ^ tmp2;

        expkey[*idx+] = expkey[*idx - *Nk + ] ^ tmp3;

    }

}

// encrypt/decrypt columns of the key

#define AddRoundKey(state, key, out)\

do {\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

    out[] = state[] ^ key[];\

} while()

// recombine and mix each row in a column

#define MixSubColumns(state, out, key)\

do {\

    /* mixing column 0*/\

    out[] = Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ key[];\

    out[] = Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ key[];\

\

    /* mixing column 1*/\

    out[] = Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ key[];\

    out[] = Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ key[];\

\

    /* mixing column 2*/\

    out[] = Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[]  = Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ key[];\

    out[]  = Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ key[];\

\

    /* mixing column 3*/\

    out[] = Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ Sbox[state[]] ^ key[];\

    out[] = Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ Xtime3Sbox[state[]] ^ key[];\

    out[] = Xtime3Sbox[state[]] ^ Sbox[state[]] ^ Sbox[state[]] ^ Xtime2Sbox[state[]] ^ key[];\

} while()

// encrypt one 128 bit block

void Encrypt (uchar *in, uchar *expkey, uchar *out)

{

uchar state[Nb * ], tmp[Nb * ];

    AddRoundKey (in, expkey, state);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

#if (Nr > 10)

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

#endif

#if (Nr > 12)

    MixSubColumns (tmp, state, expkey);

    expkey += Nb * ;

    MixSubColumns (state, tmp, expkey);

    expkey += Nb * ;

#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[] ^ key[];\

    t1 = state[] ^ key[];\

    t2 = state[] ^ key[];\

    t3 = state[] ^ key[];\

    out[] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];\

    out[] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];\

    out[] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];\

    out[] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];\

\

    /* restore column 1*/\

    t0 = state[] ^ key[];\

    t1 = state[] ^ key[];\

    t2 = state[] ^ key[];\

    t3 = state[] ^ key[];\

    out[] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];\

    out[] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];\

    out[] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];\

    out[] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];\

\

    /* restore column 2*/\

    t0 = state[] ^ key[];\

    t1 = state[] ^ key[];\

    t2 = state[] ^ key[];\

    t3 = state[] ^ key[];\

    out[] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];\

    out[] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];\

    out[]  = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];\

    out[]  = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];\

\

    /* restore column 3*/\

    t0 = state[] ^ key[];\

    t1 = state[] ^ key[];\

    t2 = state[] ^ key[];\

    t3 = state[] ^ key[];\

    out[] = InvSbox[XtimeE[t0] ^ XtimeB[t1] ^ XtimeD[t2] ^ Xtime9[t3]];\

    out[] = InvSbox[Xtime9[t0] ^ XtimeE[t1] ^ XtimeB[t2] ^ XtimeD[t3]];\

    out[] = InvSbox[XtimeD[t0] ^ Xtime9[t1] ^ XtimeE[t2] ^ XtimeB[t3]];\

    out[] = InvSbox[XtimeB[t0] ^ XtimeD[t1] ^ Xtime9[t2] ^ XtimeE[t3]];\

} while()

void Decrypt (uchar *in, uchar *expkey, uchar *out)

{

uchar state[Nb * ], tmp[Nb * ];

uchar t0, t1, t2, t3;

    expkey += Nr * Nb * ;

    AddRoundKey (in, expkey, tmp);

    InvShiftRows(tmp, state);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

#if (Nr > 10)

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

#endif

#if (Nr > 12)

    expkey -= Nb * ;

    InvMixSubColumns (tmp, state, expkey);

    expkey -= Nb * ;

    InvMixSubColumns (state, tmp, expkey);

#endif

    expkey -= Nb * ;

    AddRoundKey (tmp, expkey, out);

}

#include <stdio.h>

#include <fcntl.h>

uchar in[] = { 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[];

#ifndef unix

void rd_clock (__int64 *ans)

{

unsigned dwLow, dwHigh;

    __asm {

        rdtsc

        mov dwLow, eax

        mov dwHigh, edx

    }

    *ans = (__int64)dwHigh <<  | (__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[ * Nb * (Nr + )];

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\n", diff, diff/);

    for( idx = ; idx < ; idx++ )

        printf ("%.2x ", out[idx]);

    printf ("\n");

    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\n", diff, diff/);

    for( idx = ; idx < ; idx++ )

        printf ("%.2x ", in[idx]);

    printf ("\n");

}

void certify ()

{

uchar expkey[ * Nb * (Nr + )];

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\n", diff, diff/);

    for( idx = ; idx < ; idx++ )

        printf ("%.2x ", out[idx]);

    printf ("\n");

    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\n", diff, diff/);

    for( idx = ; idx < ; idx++ )

        printf ("%.2x ", in[idx]);

    printf ("\n");

}

void decrypt (char *mykey, char *name)

{

uchar expkey[ * Nb * (Nr + )];

FILE *fd = fopen (name, "rb");

int ch, idx = ;

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

    ExpandKey (key, expkey);

    while( ch = getc(fd), ch != EOF ) {

        in[idx++] = ch;

        if( idx %  )

            continue;

        Decrypt (in, expkey, out);

        for( idx = ; idx < ; idx++ )

            putchar (out[idx]);

        idx = ;

    }

}

void encrypt (char *mykey, char *name)

{

uchar expkey[ * Nb * (Nr + )];

FILE *fd = fopen (name, "rb");

int ch, idx = ;

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

    ExpandKey (key, expkey);

    while( ch = getc(fd), ch != EOF ) {

        in[idx++] = ch;

        if( idx %  )

            continue;

        Encrypt (in, expkey, out);

        for( idx = ; idx < ; idx++ )

            putchar (out[idx]);

        idx = ;

    }

    if( idx )

      while( idx %  )

        in[idx++] = ;

    else

      return;

    Encrypt (in, expkey, out);

    for( idx = ; idx < ; idx++ )

        putchar (out[idx]);

}

uchar expkey[ * Nb * (Nr + )];

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<=  || t>= );

    return t;

}

int bestx (int b, int loops)

{

int bestx = , bestxt = ;

int x, xt, i, j;

    for( x = ; x < ; x++ ) {

        xt = ;

        for( i = ; i < loops; i++ ) {

            for( j = ; j < ; j++ )

                in[j] = xrandom() >> ;

            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 = ; loops <= ; loops *= ) {

        for( b = ; b < ; b++ ) {

            printf ("%.2d, %.5d loops:", b, loops);

            for( k = ; k < ; k++ ) {

                for( j = ; j < ; j++ )

                    key[j] = xrandom() >> ;

                ExpandKey (key, expkey);

                printf (" %.2x", bestx (b, loops) ^ key[b]);

                fflush (stdout);

            }

            printf ("\n");

        }

    }

}

void tables()

{

int i;

    for( i = ; i < ; i++)

    {

        printf("0x%.2x, ", Sbox[i] ^ Xtime2[Sbox[i]]);

        if( !((i+) % ) )

            printf("\n");

    }

    printf("\n");

    for( i = ; i < ; i++)

    {

        printf("0x%.2x, ", Xtime2[Sbox[i]]);

        if ( !((i+) % ) )

            printf("\n");

    }

}

int main (int argc, char *argv[])

{

#ifndef unix

extern int __cdecl _setmode (int, int);

    _setmode (_fileno(stdout), _O_BINARY);

#endif

    switch( argv[][] ) {

    case 'c': certify(); break;

    case 'e': encrypt(argv[], argv[]); break;

    case 'd': decrypt(argv[], argv[]); break;

    case 'b': bernstein(argv[]);    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 = ;

/*

 * 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)) <  ) {

        RandHead = RAND_size - sizeof(unsigned);

        memcpy (RandTbl + RAND_size, RandTbl, RAND_order);

    }

    fact = *(unsigned *)(RandTbl + RandHead +  * sizeof(unsigned));

    fact ^= *(unsigned *)(RandTbl + RandHead +  * sizeof(unsigned));

    fact ^= *(unsigned *)(RandTbl + RandHead +  * sizeof(unsigned));

    fact ^= *(unsigned *)(RandTbl + RandHead +  * sizeof(unsigned));

    fact ^= *(unsigned *)(RandTbl + RandHead +  * 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 * ;

    memset (RandTbl, , sizeof(RandTbl));

    RandHead = ;

    while( rand *= , rand += , bit-- )

        if( ptr[bit >> ] & ( << (bit & )) )

            for (idx = ; idx < ; idx++) {

                rand *= , rand += ;

                RandTbl[rand %  << ] ^= ;

            }

    for( idx = ; idx <  * ; idx++ )

        xrandom ();

}

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