📄 seedx-1.c
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/*******************************************************************************
* 1999. 6.29.
* FILE: seedx.c
*
* DESCRIPTION: Core routines for the enhanced SEED
*
*******************************************************************************/
#include "seedx.h"
#include "seedx.tab"
//---------------------------------------------------------------------------
/******************* Encryption/Decryption *******************/
#define GetB0(A) ( (BYTE)((A) ) )
#define GetB1(A) ( (BYTE)((A)>> 8) )
#define GetB2(A) ( (BYTE)((A)>>16) )
#define GetB3(A) ( (BYTE)((A)>>24) )
#define SeedRound(L0, L1, R0, R1, K) { \
T0 = R0 ^ (K)[0]; \
T1 = R1 ^ (K)[1]; \
T1 ^= T0; \
T1 = SS0[GetB0(T1)] ^ SS1[GetB1(T1)] ^ \
SS2[GetB2(T1)] ^ SS3[GetB3(T1)]; \
T0 += T1; \
T0 = SS0[GetB0(T0)] ^ SS1[GetB1(T0)] ^ \
SS2[GetB2(T0)] ^ SS3[GetB3(T0)]; \
T1 += T0; \
T1 = SS0[GetB0(T1)] ^ SS1[GetB1(T1)] ^ \
SS2[GetB2(T1)] ^ SS3[GetB3(T1)]; \
T0 += T1; \
L0 ^= T0; L1 ^= T1; \
}
#define EndianChange(dwS) \
( (ROTL((dwS), 8) & (DWORD)0x00ff00ff) | \
(ROTL((dwS), 24) & (DWORD)0xff00ff00) )
/************************ Block Encryption *************************/
void SeedEncrypt(BYTE *pbData, DWORD *pdwRoundKey)
{
DWORD L0, L1, R0, R1, T0, T1, *K = pdwRoundKey;
L0 = ((DWORD *)pbData)[0];
L1 = ((DWORD *)pbData)[1];
R0 = ((DWORD *)pbData)[2];
R1 = ((DWORD *)pbData)[3];
#ifndef BIG_ENDIAN
L0 = EndianChange(L0);
L1 = EndianChange(L1);
R0 = EndianChange(R0);
R1 = EndianChange(R1);
#endif
SeedRound(L0, L1, R0, R1, K ); /* 1 */
SeedRound(R0, R1, L0, L1, K+ 2); /* 2 */
SeedRound(L0, L1, R0, R1, K+ 4); /* 3 */
SeedRound(R0, R1, L0, L1, K+ 6); /* 4 */
SeedRound(L0, L1, R0, R1, K+ 8); /* 5 */
SeedRound(R0, R1, L0, L1, K+10); /* 6 */
SeedRound(L0, L1, R0, R1, K+12); /* 7 */
SeedRound(R0, R1, L0, L1, K+14); /* 8 */
SeedRound(L0, L1, R0, R1, K+16); /* 9 */
SeedRound(R0, R1, L0, L1, K+18); /* 10 */
SeedRound(L0, L1, R0, R1, K+20); /* 11 */
SeedRound(R0, R1, L0, L1, K+22); /* 12 */
#if NoRounds == 16
SeedRound(L0, L1, R0, R1, K+24); /* 13 */
SeedRound(R0, R1, L0, L1, K+26); /* 14 */
SeedRound(L0, L1, R0, R1, K+28); /* 15 */
SeedRound(R0, R1, L0, L1, K+30); /* 16 */
#endif
#ifndef BIG_ENDIAN
L0 = EndianChange(L0);
L1 = EndianChange(L1);
R0 = EndianChange(R0);
R1 = EndianChange(R1);
#endif
((DWORD *)pbData)[0] = R0;
((DWORD *)pbData)[1] = R1;
((DWORD *)pbData)[2] = L0;
((DWORD *)pbData)[3] = L1;
}
/* same as encrypt, except that round keys are applied in reverse order. */
void SeedDecrypt(BYTE *pbData, DWORD *pdwRoundKey)
{
DWORD L0, L1, R0, R1, T0, T1, *K=pdwRoundKey;
L0 = ((DWORD *)pbData)[0];
L1 = ((DWORD *)pbData)[1];
R0 = ((DWORD *)pbData)[2];
R1 = ((DWORD *)pbData)[3];
#ifndef BIG_ENDIAN
L0 = EndianChange(L0);
L1 = EndianChange(L1);
R0 = EndianChange(R0);
R1 = EndianChange(R1);
#endif
#if NoRounds == 16
SeedRound(L0, L1, R0, R1, K+30); /* 1 */
SeedRound(R0, R1, L0, L1, K+28); /* 2 */
SeedRound(L0, L1, R0, R1, K+26); /* 3 */
SeedRound(R0, R1, L0, L1, K+24); /* 4 */
#endif
SeedRound(L0, L1, R0, R1, K+22); /* 5 */
SeedRound(R0, R1, L0, L1, K+20); /* 6 */
SeedRound(L0, L1, R0, R1, K+18); /* 7 */
SeedRound(R0, R1, L0, L1, K+16); /* 8 */
SeedRound(L0, L1, R0, R1, K+14); /* 9 */
SeedRound(R0, R1, L0, L1, K+12); /* 10 */
SeedRound(L0, L1, R0, R1, K+10); /* 11 */
SeedRound(R0, R1, L0, L1, K+ 8); /* 12 */
SeedRound(L0, L1, R0, R1, K+ 6); /* 13 */
SeedRound(R0, R1, L0, L1, K+ 4); /* 14 */
SeedRound(L0, L1, R0, R1, K+ 2); /* 15 */
SeedRound(R0, R1, L0, L1, K+ 0); /* 16 */
#ifndef BIG_ENDIAN
L0 = EndianChange(L0);
L1 = EndianChange(L1);
R0 = EndianChange(R0);
R1 = EndianChange(R1);
#endif
((DWORD *)pbData)[0] = R0;
((DWORD *)pbData)[1] = R1;
((DWORD *)pbData)[2] = L0;
((DWORD *)pbData)[3] = L1;
}
/******************** Key Scheduling **********************/
/* Constants for key schedule:
KC0 = golden ratio; KCi = ROTL(KCi-1, 1) */
#define KC0 0x9e3779b9UL
#define KC1 0x3c6ef373UL
#define KC2 0x78dde6e6UL
#define KC3 0xf1bbcdccUL
#define KC4 0xe3779b99UL
#define KC5 0xc6ef3733UL
#define KC6 0x8dde6e67UL
#define KC7 0x1bbcdccfUL
#define KC8 0x3779b99eUL
#define KC9 0x6ef3733cUL
#define KC10 0xdde6e678UL
#define KC11 0xbbcdccf1UL
#if NoRounds == 16
#define KC12 0x779b99e3UL
#define KC13 0xef3733c6UL
#define KC14 0xde6e678dUL
#define KC15 0xbcdccf1bUL
#endif
#define EncRoundKeyUpdate0(K, A, B, C, D, KC) { \
T0 = A; \
A = (A>>8) ^ (B<<24); \
B = (B>>8) ^ (T0<<24); \
T0 = A + C - KC; \
T1 = B + KC - D; \
(K)[0] = SS0[GetB0(T0)] ^ SS1[GetB1(T0)] ^ \
SS2[GetB2(T0)] ^ SS3[GetB3(T0)]; \
(K)[1] = SS0[GetB0(T1)] ^ SS1[GetB1(T1)] ^ \
SS2[GetB2(T1)] ^ SS3[GetB3(T1)]; \
}
#define EncRoundKeyUpdate1(K, A, B, C, D, KC) { \
T0 = C; \
C = (C<<8) ^ (D>>24); \
D = (D<<8) ^ (T0>>24); \
T0 = A + C - KC; \
T1 = B + KC - D; \
(K)[0] = SS0[GetB0(T0)] ^ SS1[GetB1(T0)] ^ \
SS2[GetB2(T0)] ^ SS3[GetB3(T0)]; \
(K)[1] = SS0[GetB0(T1)] ^ SS1[GetB1(T1)] ^ \
SS2[GetB2(T1)] ^ SS3[GetB3(T1)]; \
}
/* Encryption key schedule */
void SeedEncRoundKey(DWORD *pdwRoundKey, BYTE *pbUserKey)
{
DWORD A, B, C, D, T0, T1, *K=pdwRoundKey;
A = ((DWORD *)pbUserKey)[0];
B = ((DWORD *)pbUserKey)[1];
C = ((DWORD *)pbUserKey)[2];
D = ((DWORD *)pbUserKey)[3];
#ifndef BIG_ENDIAN
A = EndianChange(A);
B = EndianChange(B);
C = EndianChange(C);
D = EndianChange(D);
#endif
T0 = A + C - KC0;
T1 = B - D + KC0;
K[0] = SS0[GetB0(T0)] ^ SS1[GetB1(T0)] ^
SS2[GetB2(T0)] ^ SS3[GetB3(T0)];
K[1] = SS0[GetB0(T1)] ^ SS1[GetB1(T1)] ^
SS2[GetB2(T1)] ^ SS3[GetB3(T1)];
EncRoundKeyUpdate0(K+ 2, A, B, C, D, KC1 );
EncRoundKeyUpdate1(K+ 4, A, B, C, D, KC2 );
EncRoundKeyUpdate0(K+ 6, A, B, C, D, KC3 );
EncRoundKeyUpdate1(K+ 8, A, B, C, D, KC4 );
EncRoundKeyUpdate0(K+10, A, B, C, D, KC5 );
EncRoundKeyUpdate1(K+12, A, B, C, D, KC6 );
EncRoundKeyUpdate0(K+14, A, B, C, D, KC7 );
EncRoundKeyUpdate1(K+16, A, B, C, D, KC8 );
EncRoundKeyUpdate0(K+18, A, B, C, D, KC9 );
EncRoundKeyUpdate1(K+20, A, B, C, D, KC10);
EncRoundKeyUpdate0(K+22, A, B, C, D, KC11);
#if NoRounds == 16
EncRoundKeyUpdate1(K+24, A, B, C, D, KC12);
EncRoundKeyUpdate0(K+26, A, B, C, D, KC13);
EncRoundKeyUpdate1(K+28, A, B, C, D, KC14);
EncRoundKeyUpdate0(K+30, A, B, C, D, KC15);
#endif
}
/************************ END ****************************/
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