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sm4_keyschedule.c
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sm4_keyschedule.c
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/* ===================================================================== */
/* This file is a little helper to compute SM4 key scheduling */
/* from any 4 consecutive round keys */
/* Original author: Sylvain Pelissier <sylvain.pelissier@gmail.com> 2022 */
/* */
/* Usage: */
/* sm4_keyschedule SM4_key_in_hex */
/* sm4_keyschedule Round_key_in_hex Round_key_number_between_0_and_32 */
/* */
/* Examples: */
/* sm4_keyschedule 01234567 89ABCDEF 12345678 9ABCDEF0 */
/* sm4_keyschedule FA3386F7 7814E4E0 37128B07 BB1231C6 23 */
/* sm4_keyschedule C337204D D1C1C4AF 19237F5D AB6618FE 32 */
/* */
/* This program is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* ===================================================================== */
/*****************************************************************************/
/* Includes: */
/*****************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*****************************************************************************/
/* Defines: */
/*****************************************************************************/
/* Rotate left */
#define SM4_ROTL(rs, sh) (((rs) << (sh)) | ((rs) >> (32 - (sh))))
/*****************************************************************************/
/* Private variables: */
/*****************************************************************************/
// The key input
static uint32_t key[4];
// The lookup-tables
static const uint8_t sm4_sbox[256] = {
0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48};
/* Family Key CK */
static const uint32_t FK[4] = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc };
/* Constant Key CK */
static const uint32_t sm4_CK[32] = {
0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
};
/* T' function */
static inline uint32_t sm4_RK(uint32_t rk) {
uint8_t a[4];
uint8_t b[4];
uint32_t lb = 0;
a[0] = rk >> 24;
a[1] = rk >> 16;
a[2] = rk >> 8;
a[3] = rk;
b[0] = sm4_sbox[a[0]];
b[1] = sm4_sbox[a[1]];
b[2] = sm4_sbox[a[2]];
b[3] = sm4_sbox[a[3]];
lb = b[0] << 24 | b[1] << 16 | b[2] << 8 | b[3];
return lb ^ (SM4_ROTL (lb, 13)) ^ (SM4_ROTL (lb, 23));
}
// This function produces 36 round keys.
void key_expansion(uint32_t start)
{
uint32_t k[36];
int i = 0;
if (start == 0) {
k[0] = key[0] ^ FK[0];
k[1] = key[1] ^ FK[1];
k[2] = key[2] ^ FK[2];
k[3] = key[3] ^ FK[3];
} else {
k[start] = key[0];
k[start + 1] = key[1];
k[start + 2] = key[2];
k[start + 3] = key[3];
}
for (i = start; i > 0; i--) {
k[i-1] = k[i+3] ^ (sm4_RK (k[i + 2] ^ k[i + 1] ^ k[i] ^ sm4_CK[i-1]));
}
for (i = start+4; i < 36; i++) {
k[i] = k[i-4] ^ (sm4_RK (k[i - 3] ^ k[i -2] ^ k[i - 1] ^ sm4_CK[i-4]));
}
printf("Key: %08X %08X %08X %08X\n", k[0] ^ FK[0], k[1] ^ FK[1], k[2] ^ FK[2], k[3] ^ FK[3]);
for (i = 0; i < 36; i+= 4) {
printf("K%02i: %08X %08X %08X %08X\n", i, k[i], k[i+1], k[i+2], k[i+3]);
}
}
unsigned char is_hex_char(char c)
{
return (
(c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F')
);
}
int main(int argc, char *argv[])
{
uint8_t i, j;
uint8_t round=0;
uint32_t arglen;
if (argc < 5) {
printf("Usage: \n%s SM4_key_in_hex\n", argv[0]);
printf("%s Round_keys_in_hex Initial_round_key_number_between_0_and_32\n", argv[0]);
printf("Examples:\n");
printf("- SM4: (provide 4 round keys)\n");
printf(" %s B1BA2737 C83233FE 7F7A7DF0 FBB01D4A\n", argv[0]);
printf(" %s 97F926D5 677B324A C439D77C 8B03FDF8 5\n", argv[0]);
printf(" %s FA3386F7 7814E4E0 37128B07 BB1231C6 23\n", argv[0]);
return EXIT_FAILURE;
}
for (j = 0; j < 4; j ++) {
arglen = strlen(argv[j+1]);
if (arglen != 8) {
printf("Error: round key must be 4-byte long\n");
return EXIT_FAILURE;
}
for(i = 0; i < 8; i += 2) {
if(is_hex_char(argv[j+1][i]) == 0 || is_hex_char(argv[j+1][i + 1]) == 0) {
return EXIT_FAILURE;
}
}
key[j] = strtoul((const char*)argv[j+1], NULL, 16);
}
if (argc > 5) {
round = atoi(argv[5]);
if (round < 0 || round > 32) {
printf("Error: round number must be between 0 and 32\n");
return EXIT_FAILURE;
}
}
key_expansion(round);
}