📄 des_f4.c
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/* Initial Permutation macro */
#define DES_IP(X,Y) \
{ \
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; \
}
/* Final Permutation macro */
#define DES_FP(X,Y) \
{ \
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 round macro */
#define DES_ROUND(X,Y) \
{ \
T = *SK++ ^ X; \
Y ^= SB8[ (T ) & 0x3F ] ^ \
SB6[ (T >> 8) & 0x3F ] ^ \
SB4[ (T >> 16) & 0x3F ] ^ \
SB2[ (T >> 24) & 0x3F ]; \
\
T = *SK++ ^ ((X << 28) | (X >> 4)); \
Y ^= SB7[ (T ) & 0x3F ] ^ \
SB5[ (T >> 8) & 0x3F ] ^ \
SB3[ (T >> 16) & 0x3F ] ^ \
SB1[ (T >> 24) & 0x3F ]; \
}
/* DES key schedule */
void des_main_ks ( uint32 SK[32], const uint8 key[8] )
{
uint16 i;
uint32 X, Y, T;
GET_UINT32( X, key, 0 );
GET_UINT32( Y, key, 4 );
/* Permuted Choice 1 */
T = ((Y >> 4) ^ X) & 0x0F0F0F0F; X ^= T; Y ^= (T << 4);
T = ((Y ) ^ X) & 0x10101010; X ^= T; Y ^= (T );
X = (LHs[ (X ) & 0xF] << 3) | (LHs[ (X >> 8) & 0xF ] << 2)
| (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ] )
| (LHs[ (X >> 5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6)
| (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4);
Y = (RHs[ (Y >> 1) & 0xF] << 3) | (RHs[ (Y >> 9) & 0xF ] << 2)
| (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ] )
| (RHs[ (Y >> 4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6)
| (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4);
X &= 0x0FFFFFFF;
Y &= 0x0FFFFFFF;
/* calculate subkeys */
for( i = 0; i < 16; i++ )
{
( (i < 2) || (i == 8) || (i == 15) ) ? ( X = ( ( (X << 1) | (X >> 27) ) & 0x0FFFFFFF ), Y = ( ( (Y << 1) | (Y >> 27) ) & 0x0FFFFFFF) )
: ( X = ( ( (X << 2) | (X >> 26) ) & 0x0FFFFFFF ), Y = ( ( (Y << 2) | (Y >> 26) ) & 0x0FFFFFFF) );
*SK++ = ((X << 4) & 0x24000000) | ((X << 28) & 0x10000000)
| ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000)
| ((X << 6) & 0x01000000) | ((X << 9) & 0x00200000)
| ((X >> 1) & 0x00100000) | ((X << 10) & 0x00040000)
| ((X << 2) & 0x00020000) | ((X >> 10) & 0x00010000)
| ((Y >> 13) & 0x00002000) | ((Y >> 4) & 0x00001000)
| ((Y << 6) & 0x00000800) | ((Y >> 1) & 0x00000400)
| ((Y >> 14) & 0x00000200) | ((Y ) & 0x00000100)
| ((Y >> 5) & 0x00000020) | ((Y >> 10) & 0x00000010)
| ((Y >> 3) & 0x00000008) | ((Y >> 18) & 0x00000004)
| ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001);
*SK++ = ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000)
| ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000)
| ((X >> 2) & 0x02000000) | ((X << 1) & 0x01000000)
| ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000)
| ((X << 3) & 0x00080000) | ((X >> 6) & 0x00040000)
| ((X << 15) & 0x00020000) | ((X >> 4) & 0x00010000)
| ((Y >> 2) & 0x00002000) | ((Y << 8) & 0x00001000)
| ((Y >> 14) & 0x00000808) | ((Y >> 9) & 0x00000400)
| ((Y ) & 0x00000200) | ((Y << 7) & 0x00000100)
| ((Y >> 7) & 0x00000020) | ((Y >> 3) & 0x00000011)
| ((Y << 2) & 0x00000004) | ((Y >> 21) & 0x00000002);
}
}
void des_set_key ( des_context *ctx, const uint8 key[8] )
{
uint16 i;
/* setup encryption subkeys */
des_main_ks( ctx->esk, key );
/* setup decryption subkeys */
for( i = 0; i < 32; i += 4 )
{
ctx->dsk[i ] = ctx->esk[30 - i];
ctx->dsk[i + 1] = ctx->esk[31 - i];
ctx->dsk[i + 2] = ctx->esk[28 - i];
ctx->dsk[i + 3] = ctx->esk[29 - i];
}
}
/* DES 64-bit block encryption/decryption */
void des_crypt ( uint32 SK[32], const uint8 input[8], uint8 output[8] )
{
uint32 X, Y, T;
GET_UINT32( X, input, 0 );
GET_UINT32( Y, input, 4 );
DES_IP( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_ROUND( Y, X ); DES_ROUND( X, Y );
DES_FP( Y, X );
PUT_UINT32( Y, output, 0 );
PUT_UINT32( X, output, 4 );
}
void des_encrypt ( des_context *ctx, const uint8 input[8], uint8 output[8] )
{
des_crypt( ctx->esk, input, output );
}
void des_decrypt ( des_context *ctx, const uint8 input[8], uint8 output[8] )
{
des_crypt( ctx->dsk, input, output );
}
/* --------------------------------------------------------------------- */
int main (void)
{
uint8 plaintext [8 ];
uint8 ciphertext [8 ];
des_context ctx;
uint16 i,EncBase=0,DecBase=0,flag=0;
des_set_key( &ctx, key );
while(!flag)
{
for (i = 0 ; i < 8 ; i++) ((Message[EncBase+i] != 0x00) && (!flag)) ? (plaintext[i] = Message[EncBase+i]) : (plaintext[i] = ' ', flag = 1);
des_encrypt( &ctx, plaintext, ciphertext );
for (i = 0 ; i < 8 ; i += 2)
{
EncMessage[EncBase + i ] = ciphertext[i ];
EncMessage[EncBase + i + 1] = ciphertext[i + 1];
}
EncBase += 8;
}
#ifndef RICA
for (i=0; i<256; i++)
printf("%x\n", EncMessage[i]);
#endif
// while (DecBase < EncBase)
// {
// for (i = 0 ; i < 8 ; i += 2)
// {
// ciphertext[i ] = EncMessage[DecBase + i ];
// ciphertext[i + 1] = EncMessage[DecBase + i + 1];
// }
//
// des_decrypt( &ctx, ciphertext, plaintext );
//
// for (i = 0 ; i < 8 ; i += 2)
// {
// DecMessage[DecBase + i ] = plaintext[i];
// DecMessage[DecBase + i + 1] = plaintext[i + 1];
// }
// DecBase += 8;
// }
return( 0 );
}
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