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gift128.c
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Sun, Feb 23, 21:15

gift128.c
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/*
GIFT-128 (bitslice) implementations
Prepared by: Siang Meng Sim
Email: crypto.s.m.sim@gmail.com
Date: 23 Mar 2019
*/
#include <stdint.h>
#include <stdio.h>
/*Round constants*/
const unsigned char GIFT_RC[40] = {
0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3E, 0x3D, 0x3B, 0x37, 0x2F,
0x1E, 0x3C, 0x39, 0x33, 0x27, 0x0E, 0x1D, 0x3A, 0x35, 0x2B,
0x16, 0x2C, 0x18, 0x30, 0x21, 0x02, 0x05, 0x0B, 0x17, 0x2E,
0x1C, 0x38, 0x31, 0x23, 0x06, 0x0D, 0x1B, 0x36, 0x2D, 0x1A
};
uint32_t rowperm(uint32_t S, int B0_pos, int B1_pos, int B2_pos, int B3_pos){
uint32_t T=0;
int b;
for(b=0; b<8; b++){
T |= ((S>>(4*b+0))&0x1)<<(b + 8*B0_pos);
T |= ((S>>(4*b+1))&0x1)<<(b + 8*B1_pos);
T |= ((S>>(4*b+2))&0x1)<<(b + 8*B2_pos);
T |= ((S>>(4*b+3))&0x1)<<(b + 8*B3_pos);
}
return T;
}
void giftb128(uint8_t P[16], const uint8_t K[16], uint8_t C[16]){
int round;
uint32_t S[4],T;
uint16_t W[8],T6,T7;
S[0] = ((uint32_t)P[ 0]<<24) | ((uint32_t)P[ 1]<<16) | ((uint32_t)P[ 2]<<8) | (uint32_t)P[ 3];
S[1] = ((uint32_t)P[ 4]<<24) | ((uint32_t)P[ 5]<<16) | ((uint32_t)P[ 6]<<8) | (uint32_t)P[ 7];
S[2] = ((uint32_t)P[ 8]<<24) | ((uint32_t)P[ 9]<<16) | ((uint32_t)P[10]<<8) | (uint32_t)P[11];
S[3] = ((uint32_t)P[12]<<24) | ((uint32_t)P[13]<<16) | ((uint32_t)P[14]<<8) | (uint32_t)P[15];
W[0] = ((uint16_t)K[ 0]<<8) | (uint16_t)K[ 1];
W[1] = ((uint16_t)K[ 2]<<8) | (uint16_t)K[ 3];
W[2] = ((uint16_t)K[ 4]<<8) | (uint16_t)K[ 5];
W[3] = ((uint16_t)K[ 6]<<8) | (uint16_t)K[ 7];
W[4] = ((uint16_t)K[ 8]<<8) | (uint16_t)K[ 9];
W[5] = ((uint16_t)K[10]<<8) | (uint16_t)K[11];
W[6] = ((uint16_t)K[12]<<8) | (uint16_t)K[13];
W[7] = ((uint16_t)K[14]<<8) | (uint16_t)K[15];
for(round=0; round<40; round++){
//printf("in %d ", round);
//printf("%08X", S[0]);
//printf("%08X", S[1]);
//printf("%08X", S[2]);
//printf("%08X", S[3]);
//putchar('\n');
/*===SubCells===*/
S[1] ^= S[0] & S[2];
S[0] ^= S[1] & S[3];
S[2] ^= S[0] | S[1];
S[3] ^= S[2];
S[1] ^= S[3];
S[3] ^= 0xffffffff;
S[2] ^= S[0] & S[1];
T = S[0];
S[0] = S[3];
S[3] = T;
//printf("sub %d ", round);
//printf("%08X", S[0]);
//printf("%08X", S[1]);
//printf("%08X", S[2]);
//printf("%08X", S[3]);
//putchar('\n');
/*===PermBits===*/
S[0] = rowperm(S[0],0,3,2,1);
S[1] = rowperm(S[1],1,0,3,2);
S[2] = rowperm(S[2],2,1,0,3);
S[3] = rowperm(S[3],3,2,1,0);
//printf("perm %d ", round);
//printf("%08X", S[0]);
//printf("%08X", S[1]);
//printf("%08X", S[2]);
//printf("%08X", S[3]);
//putchar('\n');
/*===AddRoundKey===*/
S[2] ^= ((uint32_t)W[2]<<16) | (uint32_t)W[3];
S[1] ^= ((uint32_t)W[6]<<16) | (uint32_t)W[7];
/*Add round constant*/
S[3] ^= 0x80000000 ^ GIFT_RC[round];
//printf("mix %d ", round);
//printf("%08X", S[0]);
//printf("%08X", S[1]);
//printf("%08X", S[2]);
//printf("%08X", S[3]);
//putchar('\n');
/*===Key state update===*/
T6 = (W[6]>>2) | (W[6]<<14);
T7 = (W[7]>>12) | (W[7]<<4);
W[7] = W[5];
W[6] = W[4];
W[5] = W[3];
W[4] = W[2];
W[3] = W[1];
W[2] = W[0];
W[1] = T7;
W[0] = T6;
}
C[ 0] = S[0]>>24;
C[ 1] = S[0]>>16;
C[ 2] = S[0]>>8;
C[ 3] = S[0];
C[ 4] = S[1]>>24;
C[ 5] = S[1]>>16;
C[ 6] = S[1]>>8;
C[ 7] = S[1];
C[ 8] = S[2]>>24;
C[ 9] = S[2]>>16;
C[10] = S[2]>>8;
C[11] = S[2];
C[12] = S[3]>>24;
C[13] = S[3]>>16;
C[14] = S[3]>>8;
C[15] = S[3];
return;}

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