// 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\n", diff, diff/16);
for( idx = 0; idx < 16; 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/16);
for( idx = 0; idx < 16; idx++ )
printf ("%.2x ", in[idx]);
printf ("\n");
}
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\n", diff, diff/16);
for( idx = 0; idx < 16; 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/16);
for( idx = 0; idx < 16; idx++ )
printf ("%.2x ", in[idx]);
printf ("\n");
}
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 ("\n");
}
}
}
void tables()
{
int i;
for( i = 0; i < 256; i++)
{
printf("0x%.2x, ", Sbox[i] ^ Xtime2[Sbox[i]]);
if( !((i+1) % 16) )
printf("\n");
}
printf("\n");
for( i = 0; i < 256; i++)
{
printf("0x%.2x, ", Xtime2[Sbox[i]]);
if ( !((i+1) % 16) )
printf("\n");
}
}
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 ();
}
