1 /*
2 * Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the License); you may
5 * not use this file except in compliance with the License.
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 */
9
10
11 #include <gmssl/sm4.h>
12 #include <gmssl/endian.h>
13 #include "sm4_lcl.h"
14
15 static uint32_t FK[4] = {
16 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc,
17 };
18
19 static uint32_t CK[32] = {
20 0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
21 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
22 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
23 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
24 0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
25 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
26 0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
27 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279,
28 };
29
30 #define L32_(x) \
31 ((x) ^ \
32 ROL32((x), 13) ^ \
33 ROL32((x), 23))
34
35 #define ENC_ROUND(x0, x1, x2, x3, x4, i) \
36 x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
37 x4 = S32(x4); \
38 x4 = x0 ^ L32_(x4); \
39 *(rk + i) = x4
40
41 #define DEC_ROUND(x0, x1, x2, x3, x4, i) \
42 x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
43 x4 = S32(x4); \
44 x4 = x0 ^ L32_(x4); \
45 *(rk + 31 - i) = x4
46
sm4_set_encrypt_key(SM4_KEY * key,const uint8_t user_key[16])47 void sm4_set_encrypt_key(SM4_KEY *key, const uint8_t user_key[16])
48 {
49 uint32_t *rk = key->rk;
50 uint32_t x0, x1, x2, x3, x4;
51
52 x0 = GETU32(user_key ) ^ FK[0];
53 x1 = GETU32(user_key + 4) ^ FK[1];
54 x2 = GETU32(user_key + 8) ^ FK[2];
55 x3 = GETU32(user_key + 12) ^ FK[3];
56
57 #define ROUND ENC_ROUND
58 ROUNDS(x0, x1, x2, x3, x4);
59 #undef ROUND
60
61 x0 = x1 = x2 = x3 = x4 = 0;
62 }
63
sm4_set_decrypt_key(SM4_KEY * key,const uint8_t user_key[16])64 void sm4_set_decrypt_key(SM4_KEY *key, const uint8_t user_key[16])
65 {
66 uint32_t *rk = key->rk;
67 uint32_t x0, x1, x2, x3, x4;
68
69 x0 = GETU32(user_key ) ^ FK[0];
70 x1 = GETU32(user_key + 4) ^ FK[1];
71 x2 = GETU32(user_key + 8) ^ FK[2];
72 x3 = GETU32(user_key + 12) ^ FK[3];
73
74 #define ROUND DEC_ROUND
75 ROUNDS(x0, x1, x2, x3, x4);
76 #undef ROUND
77
78 x0 = x1 = x2 = x3 = x4 = 0;
79 }
80