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SM4Util国密加密工具类（可逆）
/**
* 国密SM4
*
* @author Luke-lee
*/
public class SM4Util {private static byte[] iv = {1, 2, 3, 4, 5, 6, 7, 8};
private static final String CODE_UTF8 = "UTF-8";
private static final String PASSWORD_CRYPT_KEY = "CSSssDes";
private static final String KEY_ = "ZrAR018YfzXjGB81";
private static final int ROUND = 32;
private static final int ENCRYPT = 1;
private static final int DECRYPT = 0;
private static final int BLOCK = 16;
private byte[] Sbox = {(byte) 0xd6, (byte) 0x90, (byte) 0xe9, (byte) 0xfe, (byte) 0xcc, (byte) 0xe1, 0x3d,
(byte) 0xb7, 0x16, (byte) 0xb6, 0x14, (byte) 0xc2, 0x28, (byte) 0xfb, 0x2c, 0x05, 0x2b, 0x67, (byte) 0x9a,
0x76, 0x2a, (byte) 0xbe, 0x04, (byte) 0xc3, (byte) 0xaa, 0x44, 0x13, 0x26, 0x49, (byte) 0x86, 0x06,
(byte) 0x99, (byte) 0x9c, 0x42, 0x50, (byte) 0xf4, (byte) 0x91, (byte) 0xef, (byte) 0x98, 0x7a, 0x33, 0x54,
0x0b, 0x43, (byte) 0xed, (byte) 0xcf, (byte) 0xac, 0x62, (byte) 0xe4, (byte) 0xb3, 0x1c, (byte) 0xa9,
(byte) 0xc9, 0x08, (byte) 0xe8, (byte) 0x95, (byte) 0x80, (byte) 0xdf, (byte) 0x94, (byte) 0xfa, 0x75,
(byte) 0x8f, 0x3f, (byte) 0xa6, 0x47, 0x07, (byte) 0xa7, (byte) 0xfc, (byte) 0xf3, 0x73, 0x17, (byte) 0xba,
(byte) 0x83, 0x59, 0x3c, 0x19, (byte) 0xe6, (byte) 0x85, 0x4f, (byte) 0xa8, 0x68, 0x6b, (byte) 0x81,
(byte) 0xb2, 0x71, 0x64, (byte) 0xda, (byte) 0x8b, (byte) 0xf8, (byte) 0xeb, 0x0f, 0x4b, 0x70, 0x56,
(byte) 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, (byte) 0xd1, (byte) 0xa2, 0x25, 0x22, 0x7c, 0x3b,
0x01, 0x21, 0x78, (byte) 0x87, (byte) 0xd4, 0x00, 0x46, 0x57, (byte) 0x9f, (byte) 0xd3, 0x27, 0x52, 0x4c,
0x36, 0x02, (byte) 0xe7, (byte) 0xa0, (byte) 0xc4, (byte) 0xc8, (byte) 0x9e, (byte) 0xea, (byte) 0xbf,
(byte) 0x8a, (byte) 0xd2, 0x40, (byte) 0xc7, 0x38, (byte) 0xb5, (byte) 0xa3, (byte) 0xf7, (byte) 0xf2,
(byte) 0xce, (byte) 0xf9, 0x61, 0x15, (byte) 0xa1, (byte) 0xe0, (byte) 0xae, 0x5d, (byte) 0xa4, (byte) 0x9b,
0x34, 0x1a, 0x55, (byte) 0xad, (byte) 0x93, 0x32, 0x30, (byte) 0xf5, (byte) 0x8c, (byte) 0xb1, (byte) 0xe3,
0x1d, (byte) 0xf6, (byte) 0xe2, 0x2e, (byte) 0x82, 0x66, (byte) 0xca, 0x60, (byte) 0xc0, 0x29, 0x23,
(byte) 0xab, 0x0d, 0x53, 0x4e, 0x6f, (byte) 0xd5, (byte) 0xdb, 0x37, 0x45, (byte) 0xde, (byte) 0xfd,
(byte) 0x8e, 0x2f, 0x03, (byte) 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, (byte) 0x8d, 0x1b, (byte) 0xaf,
(byte) 0x92, (byte) 0xbb, (byte) 0xdd, (byte) 0xbc, 0x7f, 0x11, (byte) 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a,
(byte) 0xd8, 0x0a, (byte) 0xc1, 0x31, (byte) 0x88, (byte) 0xa5, (byte) 0xcd, 0x7b, (byte) 0xbd, 0x2d, 0x74,
(byte) 0xd0, 0x12, (byte) 0xb8, (byte) 0xe5, (byte) 0xb4, (byte) 0xb0, (byte) 0x89, 0x69, (byte) 0x97, 0x4a,
0x0c, (byte) 0x96, 0x77, 0x7e, 0x65, (byte) 0xb9, (byte) 0xf1, 0x09, (byte) 0xc5, 0x6e, (byte) 0xc6,
(byte) 0x84, 0x18, (byte) 0xf0, 0x7d, (byte) 0xec, 0x3a, (byte) 0xdc, 0x4d, 0x20, 0x79, (byte) 0xee, 0x5f,
0x3e, (byte) 0xd7, (byte) 0xcb, 0x39, 0x48};
private int[] CK = {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};
public static String encodeSMS4(String plaintext) throws Exception {
return SM4Util.encodeSMS4(plaintext, null);
}public static String encodeSMS4(String plaintext, String key) throws Exception {
if (!StringUtils.hasText(plaintext)) {
return null;
}
byte[] b = encryptDES(plaintext).getBytes(CODE_UTF8);
byte[] rstr = SM4Util.encodeSMS4(b, key);
return ConvertUtil.byteToHex(rstr);
}/**
* 不限明文长度的SMS4加密
*
* @param plaintext
* @param key
* @return
*/
private static byte[] encodeSMS4(byte[] plaintext, String key) {
byte[] ciphertext = new byte[plaintext.length];
int k = 0;
int plainLen = plaintext.length;
while (k + 16 <= plainLen) {
byte[] cellPlain = new byte[16];
System.arraycopy(plaintext, k, cellPlain, 0, 16);
byte[] cellCipher = encode16(cellPlain, key);
System.arraycopy(cellCipher, 0, ciphertext, k, cellCipher.length);
k += 16;
}
return ciphertext;
}/**
* 不限明文长度的SMS4解密
*
* @param ciphertext
* @param key
* @return
*/
private static byte[] decodeSMS4(byte[] ciphertext, String key) {
byte[] plaintext = new byte[ciphertext.length];
int k = 0;
int cipherLen = ciphertext.length;
while (k + 16 <= cipherLen) {
byte[] cellCipher = new byte[16];
System.arraycopy(ciphertext, k, cellCipher, 0, 16);
byte[] cellPlain = decode16(cellCipher, key);
System.arraycopy(cellPlain, 0, plaintext, k, cellPlain.length);
k += 16;
}
return plaintext;
}/**
* 解密，获得明文字符串
*
* @param ciphertext 内容
* @param code编码
* @return
*/
public static String decodeSMS4toString(String ciphertext, String code) throws Exception {
if (!StringUtils.hasText(ciphertext)) {
return null;
}
byte[] bytes = ConvertUtil.hexStringToBytes(ciphertext);
byte[] plaintext = decodeSMS4(bytes, KEY_);
return decryptDES(plaintext, code);
}/**
* 解密，获得明文字符串
*
* @param ciphertext 内容
* @param key秘钥
* @param code编码
* @return
*/
public static String decodeSMS4toString(String ciphertext, String key, String code) throws Exception {
if (!StringUtils.hasText(ciphertext)) {
return null;
}
byte[] bytes = ConvertUtil.hexStringToBytes(ciphertext);
byte[] plaintext = decodeSMS4(bytes, key);
return decryptDES(plaintext, code);
}private static byte[] encode16(byte[] plaintext, String key) {
byte[] key_ = null;
if (!StringUtils.hasText(key)) {
key_ = KEY_.getBytes();
} else {
key_ = key.getBytes();
}byte[] cipher = new byte[16];
SM4Util sm4 = new SM4Util();
sm4.sms4(plaintext, 16, key_, cipher, ENCRYPT);
return cipher;
}/**
* 只加密16位明文
*
* @param plaintext
* @param key
* @return
*/
private static byte[] x(byte[] plaintext, String key) {
byte[] key_ = null;
if (!StringUtils.hasText(key)) {
key_ = KEY_.getBytes();
} else {
key_ = key.getBytes();
}byte[] cipher = new byte[16];
SM4Util sm4 = new SM4Util();
sm4.sms4(plaintext, 16, key_, cipher, ENCRYPT);
return cipher;
}/**
* 只解密16位密文
*
* @param ciphertext
* @param key
* @return
*/
private static byte[] decode16(byte[] ciphertext, String key) {
byte[] plain = new byte[16];
SM4Util sm4 = new SM4Util();
sm4.sms4(ciphertext, 16, key.getBytes(), plain, DECRYPT);
return plain;
}private int sms4(byte[] in, int inLen, byte[] key, byte[] out, int CryptFlag) {
int point = 0;
int[] round_key = new int[ROUND];
SMS4KeyExt(key, round_key, CryptFlag);
byte[] input;
byte[] output = new byte[16];
while (inLen >= BLOCK) {
input = Arrays.copyOfRange(in, point, point + 16);
SMS4Crypt(input, output, round_key);
System.arraycopy(output, 0, out, point, BLOCK);
inLen -= BLOCK;
point += BLOCK;
}return 0;
}private int Rotl(int x, int y) {
return x << y | x >>> (32 - y);
}private int ByteSub(int A) {
return (Sbox[A >>> 24 & 0xFF] & 0xFF) << 24 | (Sbox[A >>> 16 & 0xFF] & 0xFF) << 16
| (Sbox[A >>> 8 & 0xFF] & 0xFF) << 8 | (Sbox[A & 0xFF] & 0xFF);
}private int L1(int B) {
return B ^ Rotl(B, 2) ^ Rotl(B, 10) ^ Rotl(B, 18) ^ Rotl(B, 24);
}private int L2(int B) {
return B ^ Rotl(B, 13) ^ Rotl(B, 23);
}private void SMS4Crypt(byte[] Input, byte[] Output, int[] rk) {
int r, mid, x0, x1, x2, x3;
int[] x = new int[4];
int[] tmp = new int[4];
for (int i = 0;
i < 4;
i++) {
tmp[0] = Input[4 * i] & 0xff;
tmp[1] = Input[1 + 4 * i] & 0xff;
tmp[2] = Input[2 + 4 * i] & 0xff;
tmp[3] = Input[3 + 4 * i] & 0xff;
x[i] = tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3];
}
for (r = 0;
r < 32;
r += 4) {
mid = x[1] ^ x[2] ^ x[3] ^ rk[r];
mid = ByteSub(mid);
x[0] = x[0] ^ L1(mid);
// x4mid = x[2] ^ x[3] ^ x[0] ^ rk[r + 1];
mid = ByteSub(mid);
x[1] = x[1] ^ L1(mid);
// x5mid = x[3] ^ x[0] ^ x[1] ^ rk[r + 2];
mid = ByteSub(mid);
x[2] = x[2] ^ L1(mid);
// x6mid = x[0] ^ x[1] ^ x[2] ^ rk[r + 3];
mid = ByteSub(mid);
x[3] = x[3] ^ L1(mid);
// x7
}// Reverse
for (int j = 0;
j < 16;
j += 4) {
Output[j] = (byte) (x[3 - j / 4] >>> 24 & 0xFF);
Output[j + 1] = (byte) (x[3 - j / 4] >>> 16 & 0xFF);
Output[j + 2] = (byte) (x[3 - j / 4] >>> 8 & 0xFF);
Output[j + 3] = (byte) (x[3 - j / 4] & 0xFF);
}
}private void SMS4KeyExt(byte[] Key, int[] rk, int CryptFlag) {
int r, mid;
int[] x = new int[4];
int[] tmp = new int[4];
for (int i = 0;
i < 4;
i++) {
tmp[0] = Key[4 * i] & 0xFF;
tmp[1] = Key[1 + 4 * i] & 0xff;
tmp[2] = Key[2 + 4 * i] & 0xff;
tmp[3] = Key[3 + 4 * i] & 0xff;
x[i] = tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3];
}
x[0] ^= 0xa3b1bac6;
x[1] ^= 0x56aa3350;
x[2] ^= 0x677d9197;
x[3] ^= 0xb27022dc;
for (r = 0;
r < 32;
r += 4) {
mid = x[1] ^ x[2] ^ x[3] ^ CK[r];
mid = ByteSub(mid);
rk[r] = x[0] ^= L2(mid);
// rk0=K4mid = x[2] ^ x[3] ^ x[0] ^ CK[r + 1];
mid = ByteSub(mid);
rk[r + 1] = x[1] ^= L2(mid);
// rk1=K5mid = x[3] ^ x[0] ^ x[1] ^ CK[r + 2];
mid = ByteSub(mid);
rk[r + 2] = x[2] ^= L2(mid);
// rk2=K6mid = x[0] ^ x[1] ^ x[2] ^ CK[r + 3];
mid = ByteSub(mid);
rk[r + 3] = x[3] ^= L2(mid);
// rk3=K7
}// 解密时轮密钥使用顺序：rk31,rk30,...,rk0
if (CryptFlag == DECRYPT) {
for (r = 0;
r < 16;
r++) {
mid = rk[r];
rk[r] = rk[31 - r];
rk[31 - r] = mid;
}
}
}/**
* Str转16位
*
* @param encryptString
* @return
*/
private static String encryptDES(String encryptString) throws Exception {
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(PASSWORD_CRYPT_KEY.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
byte[] encryptedData = https://www.it610.com/article/cipher.doFinal(encryptString.getBytes());
String hexString = parseByte2HexStr(encryptedData);
return hexString;
// return Base64.encode(encryptedData);
}/**
* 16位转str
*
* @param decrypt
* @param code
* @return
*/
private static String decryptDES(byte[] decrypt, String code) throws Exception {
byte[] byteMi = hex2byte(decrypt);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(PASSWORD_CRYPT_KEY.getBytes(),"DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
byte decryptedData[] = cipher.doFinal(byteMi);
if (!StringUtils.hasText(code)) {
code = CODE_UTF8;
}
return new String(decryptedData, code);
}private static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0;
i < buf.length;
i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}private static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0) {
throw new IllegalArgumentException("长度不是偶数");
}
byte[] b2 = new byte[b.length / 2];
for (int n = 0;
n < b.length;
n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}private SM4Util() {
}
}
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