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sm4.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef unsigned char uchar;
typedef unsigned long ulong;
typedef unsigned long long ullong;
ulong rk_enc[32] = {0};
ulong rk_dec[32] = {0};
/*Sbox*/
uchar 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};
/*fixed parameter*/
ulong 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};
/*system parameter*/
ulong FK[4]={0xA3B1BAC6,0x56AA3350,0x677D9197,0xB27022DC};
ulong ROL32(ulong x, ulong i) {
return (x << i) | (x >> (32 - i));
}
/*nonlinear transformation*/
ulong tao(ulong u_int) {
return SBox[u_int >> 24] | SBox[(u_int >> 16)&0xff] | SBox[(u_int >> 18)&0xff] | SBox[u_int&0xff];
}
/*linear transformation*/
ulong L_enc(ulong u_int) {
u_int = u_int ^ ROL32(u_int ,2) ^ ROL32(u_int ,10) ^ ROL32(u_int ,18) ^ ROL32(u_int ,24) ;
return u_int;
}
ulong L_init(ulong u_int) {
u_int = u_int ^ ROL32(u_int ,13) ^ ROL32(u_int ,23) ;
return u_int;
}
/*function T*/
ulong T_enc(ulong u_int) {
return L_enc(tao(u_int));
}
ulong T_init(ulong u_int) {
return L_init(tao(u_int));
}
/*key expansion*/
void key_expand(ulong MK[4]) {
ulong K[36] = {0};
for (int i = 0; i < 4; i++)
K[i] = MK[i] ^ FK[i];
for (int i = 0; i < 32 ; i++) {
K[i + 4] = K[i] ^ T_init(K[i + 1] ^ K[i + 2] ^ CK[i]);
rk_enc[i] = K[i + 4];
rk_dec[31 - i] = K[i + 4];
}
}
void R(ulong *text) {
ulong temp = text[0];
text[0] = text[3];
text[3] = temp;
temp = text[1];
text[1] = text[2];
text[2] = temp;
}
void crypt_a_block(ulong *plaintext, ulong key[4], ulong ENC) {
ulong X[36];
ulong rk;
key_expand(key);
for (int i = 0; i < 4; i++)
X[i] = plaintext[i];
for (int i = 0; i < 32; i++) {
if (ENC) rk = rk_enc[i];
else rk = rk_dec[i];
X[i + 4] = X[i] ^ T_enc(X[i + 1] ^ X[i + 2] ^ X[i + 3] ^ rk);
}
R((ulong *)&X[32]);
for (int i = 0; i < 4; i++)
plaintext[i] = X[i + 32];
}
uchar * encrypt_with_padding_zero(uchar *plaintext, ulong text_len, uchar *key) {
/*
Attention for the length of key !!!
if not 16bytes / 4words / 128bits this will just take the first 16bytes (with padding zero if less)!
*/
/*
for the length of plaintext there's no limit.
text_len represents the length of plaintext, [In bytes].
*/
if (!text_len)
return 0;
else if ((int)text_len < 0) {
printf("\r[*] The length is so large! Is the length POSITIVE?");
}
ulong buffer_len = (text_len % 16 != 0) ? ((text_len / 16 + 1) * 16) : (text_len);
uchar * buffer = (uchar *)malloc(buffer_len + 2);
memset(buffer, 0, buffer_len + 2);
for (int i = 0; i < buffer_len; i++) buffer[i] = plaintext[i];
for (int i = 0; i < buffer_len; i += 16) {
crypt_a_block((ulong *)&buffer[i], (ulong *)key, 1);
}
for (int i = 0; i < buffer_len; i++) plaintext[i] = buffer[i];
return buffer;
}
void decrypt(uchar *encrypted, ulong encrypted_len, uchar *key) {
/*
Attention for the length of key !!!
if not 16bytes / 4words / 128bits this will just take the first 16bytes (with padding zero if less)!
*/
/*
for the length of plaintext there's no limit.
text_len represents the length of plaintext, [In bytes].
*/
if (encrypted_len % 16 != 0) {
printf("\r[ERROR] Length of encrypted_len is not in 16-bytes multiplies\n");
}
ulong buffer_len = encrypted_len;
uchar * buffer = (uchar *)malloc(buffer_len + 2);
memset(buffer, 0, buffer_len + 2);
for (int i = 0; i < buffer_len; i++) buffer[i] = encrypted[i];
for (int i = 0; i < buffer_len; i += 16) {
crypt_a_block((ulong *)&buffer[i], (ulong *)key, 0);
}
for (int i = 0; i < buffer_len; i++) encrypted[i] = buffer[i];
free(buffer);
}
ulong CEIL_to_16(ulong x) {
if (x % 16 != 0)
return (x / 16 + 1) * 16;
else
return x;
}
ulong get_encrypted_len(ulong length_of_plaintext) {
return CEIL_to_16(length_of_plaintext);
}
int main() {
uchar key[16] = "0123456789ABCDEF";
uchar plaintext[] = "I_am_a_plaintext_lalala";
//for(int i = 0; i < strlen(plaintext); i++) printf("%c",plaintext[i]);
uchar *encrypted = encrypt_with_padding_zero(plaintext, strlen(plaintext), key);
//for (int i = 0; i < 16; i++) printf("%02X",plaintext[i]);printf("\n");
decrypt(plaintext, CEIL_to_16(24), key);
for(int i = 0; i < 24; i++) printf("%c",plaintext[i]);
return 0;
}