SM4加密Java实现

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package com.hps.test2;

import java.util.Arrays;

public class SMS4 {

private static final int ENCRYPT = 1;
private static final int DECRYPT = 0;
public static final int ROUND = 32;
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 };

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);
	// return B^(B<<2|B>>>30)^(B<<10|B>>>22)^(B<<18|B>>>14)^(B<<24|B>>>8);
}

private int L2(int B) {
	return B ^ Rotl(B, 13) ^ Rotl(B, 23);
	// return B^(B<<13|B>>>19)^(B<<23|B>>>9);
}

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[0 + 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];
		 // x[i]=(Input[0+4*i]<<24|Input[1+4*i]<<16|Input[2+4*i]<<8|Input[3+4*i]);
	}
	for (r = 0; r < 32; r += 4) {
		 mid = x[1] ^ x[2] ^ x[3] ^ rk[r + 0];
		 mid = ByteSub(mid);
		 x[0] = x[0] ^ L1(mid); // x4
		
		 mid = x[2] ^ x[3] ^ x[0] ^ rk[r + 1];
		 mid = ByteSub(mid);
		 x[1] = x[1] ^ L1(mid); // x5
		
		 mid = x[3] ^ x[0] ^ x[1] ^ rk[r + 2];
		 mid = ByteSub(mid);
		 x[2] = x[2] ^ L1(mid); // x6
		
		 mid = 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[0 + 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[i]=Key[0+4*i]<<24|Key[1+4*i]<<16|Key[2+4*i]<<8|Key[3+4*i];
	}
	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 + 0];
		 mid = ByteSub(mid);
		 rk[r + 0] = x[0] ^= L2(mid); // rk0=K4
		
		 mid = x[2] ^ x[3] ^ x[0] ^ CK[r + 1];
		 mid = ByteSub(mid);
		 rk[r + 1] = x[1] ^= L2(mid); // rk1=K5
		
		 mid = x[3] ^ x[0] ^ x[1] ^ CK[r + 2];
		 mid = ByteSub(mid);
		 rk[r + 2] = x[2] ^= L2(mid); // rk2=K6
		
		 mid = 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;
		}
	}
}

public int sms4(byte[] in, int inLen, byte[] key, byte[] out, int CryptFlag) {
	int point = 0;
	int[] round_key = new int[ROUND];
	// int[] round_key={0};
	SMS4KeyExt(key, round_key, CryptFlag);
	byte[] input = new byte[16];
	byte[] output = new byte[16];

	while (inLen >= BLOCK) {
		 input = Arrays.copyOfRange(in, point, point + 16);
		 // output=Arrays.copyOfRange(out, point, point+16);
		 SMS4Crypt(input, output, round_key);
		 System.arraycopy(output, 0, out, point, BLOCK);
		 inLen -= BLOCK;
		 point += BLOCK;
	}
	return 0;
}



public static byte[] encodeSMS4(String plaintext, byte[] key) {
	if (plaintext == null || plaintext.equals("")) {
		return null;
	}
	for (int i = plaintext.getBytes().length % 16; i < 16; i++) {
		plaintext += '\0';
	}
	return SMS4.encodeSMS4(plaintext.getBytes(), key);
}
	
	/** 
	 * 不限明文长度的SMS4加密 
	 *
	 * @param plaintext 
	 * @param key 
	 * @return 
	 */
public static byte[] encodeSMS4(byte[] plaintext, byte[] key) {
	byte[] ciphertext = new byte[plaintext.length];
	
	int k = 0;
	int plainLen = plaintext.length;
	while (k + 16 <= plainLen) {
		byte[] cellPlain = new byte[16];
		for (int i = 0; i < 16; i++) {
		 cellPlain[i] = plaintext[k + i];
		}
		byte[] cellCipher = encode16(cellPlain, key);
		for (int i = 0; i < cellCipher.length; i++) {
		 ciphertext[k + i] = cellCipher[i];
		}
		k += 16;
	}
	return ciphertext;
}
	
	/** 
	 * 不限明文长度的SMS4解密 
	 *
	 * @param ciphertext 
	 * @param key 
	 * @return 
	 */
public static byte[] decodeSMS4(byte[] ciphertext, byte[] key) {
	byte[] plaintext = new byte[ciphertext.length];
	
	int k = 0;
	int cipherLen = ciphertext.length;
	while (k + 16 <= cipherLen) {
		byte[] cellCipher = new byte[16];
		for (int i = 0; i < 16; i++) {
		 cellCipher[i] = ciphertext[k + i];
		}
		byte[] cellPlain = decode16(cellCipher, key);
		for (int i = 0; i < cellPlain.length; i++) {
		 plaintext[k + i] = cellPlain[i];
		}
		k += 16;
	}
	return plaintext;
}
	
	/** 
	 * 解密，获得明文字符串 
	 * @param ciphertext 
	 * @param key 
	 * @return 
	 */
	public static String decodeSMS4toString(byte[] ciphertext, byte[] key) {
		byte[] plaintext = new byte[ciphertext.length];
		plaintext = decodeSMS4(ciphertext, key);
		return new String(plaintext);
	}
	
	/** 
	 * 只加密16位明文 
	 *
	 * @param plaintext 
	 * @param key 
	 * @return 
	 */
	private static byte[] encode16(byte[] plaintext, byte[] key) {
		byte[] cipher = new byte[16];
		SMS4 sm4 = new SMS4();
		sm4.sms4(plaintext, 16, key, cipher, ENCRYPT);
		
		return cipher;
	}
	
	/** 
	 * 只解密16位密文 
	 *
	 * @param plaintext 
	 * @param key 
	 * @return 
	 */
	private static byte[] decode16(byte[] ciphertext, byte[] key) {
		byte[] plain = new byte[16];
		SMS4 sm4 = new SMS4();
		sm4.sms4(ciphertext, 16, key, plain, DECRYPT);
		return plain;
	}

//此方法作为将加密后的16进制byte数组转换为String字符串
public static String toHexString(byte[] byteArray) {

if (byteArray == null || byteArray.length < 1)
throw new IllegalArgumentException(“this byteArray must not be null or empty”);

		 final StringBuilder hexString = new StringBuilder();
		 for (int i = 0; i < byteArray.length; i++) {
			if ((byteArray[i] & 0xff) < 0x10)//0~F前面不零
			hexString.append("0");
			hexString.append(Integer.toHexString(0xFF & byteArray[i]));
		 }
		 return hexString.toString().toLowerCase();
	}
	public static void main(String[] args) {
		String key = "qazwsxedcrfvtgbvbnm";
		String input= "阿";
		byte[] enOut = SMS4.encodeSMS4(input, key.getBytes());
		String deOut = SMS4.decodeSMS4toString(enOut, key.getBytes());
		 System.out.println("加密结果：");
		 System.out.println(toHexString(enOut));
		 System.out.println("解密结果：");
		 System.out.println(deOut);
	}

}

原文连接：https://blog.csdn.net/xiaoxiong_blog/article/details/80227759