cCipherDES.cpp File Reference

#include "pch.h"
#include "Cipher/cCipherDES.h"

Namespaces
	GrayLib

Macros
#define	DES_IP(X, Y)
#define	DES_FP(X, Y)
#define	DES_ROUND(X, Y)

Detailed Description

FIPS-46-3 compliant Triple-DES implementation DES, on which TDES is based, was originally designed by Horst Feistel at IBM in 1974, and was adopted as a standard by NIST (formerly NBS). http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf

Macro Definition Documentation

DES_FP

#define DES_FP	(		X,
			Y
	)

Value:

        {                                                           \
        X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF;                    \
        T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T;                   \
        Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF;                    \
        T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
        T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
        T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
        T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
        }

DES_IP

#define DES_IP	(		X,
			Y
	)

Value:

        {                                                               \
        T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
        T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
        T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
        T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
        Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF;                    \
        T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T;                   \
        X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF;                    \
        }

DES_ROUND

#define DES_ROUND	(		X,
			Y
	)

Value:

        {                                        \
        T = *pSK++ ^ X;                          \
        Y ^= k_SB8[ (T      ) & 0x3F ] ^         \
        k_SB6[ (T >>  8) & 0x3F ] ^              \
        k_SB4[ (T >> 16) & 0x3F ] ^              \
        k_SB2[ (T >> 24) & 0x3F ];               \
        \
        T = *pSK++ ^ ((X << 28) | (X >> 4));     \
        Y ^= k_SB7[ (T      ) & 0x3F ] ^         \
        k_SB5[ (T >>  8) & 0x3F ] ^              \
        k_SB3[ (T >> 16) & 0x3F ] ^              \
        k_SB1[ (T >> 24) & 0x3F ];               \
        }