SM2&SM3&SM4 Java实现

【摘要】

本文主要讲解“国密加密算法”SM系列的Java实现方法，不涉及具体的算法剖析，在网络上找到的java实现方法比较少，切在跨语言加密解密上会存在一些问题，所以整理此文志之。

源码下载地址http://download.csdn.net/detail/ererfei/9474502 需要C#实现SM系列算法源码的可以评论留邮箱地址，看到后发送

1.SM2 & SM3

由于SM2算法中需要使用SM3摘要算法，所以把他们放在一起

项目目录结构如下：

首先要下载一个jar包——bcprov-jdk.jar，可以到maven库中下载最新版http://central.maven.org/maven2/org/bouncycastle/并将该jar包引入项目的classpath。实现代码如下（每个工具类都有Main可以运行测试）：

a.      SM2主类

【SM2.java】

 

package com.mlq.sm;

import java.math.BigInteger;
import java.security.SecureRandom;

import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECFieldElement;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.math.ec.ECFieldElement.Fp;

public class SM2 
{
	//测试参数
//	public static final String[] ecc_param = {
//	    "8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3", 
//	    "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498", 
//	    "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A", 
//	    "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7", 
//	    "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D", 
//	    "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2" 
//	};
	
	//正式参数
	public static String[] ecc_param = { 
		"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",
		"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",
		"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",
		"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",
		"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",
		"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
	};

	public static SM2 Instance() 
	{
		return new SM2();
	}

	public final BigInteger ecc_p;
	public final BigInteger ecc_a;
	public final BigInteger ecc_b;
	public final BigInteger ecc_n;
	public final BigInteger ecc_gx;
	public final BigInteger ecc_gy;
	public final ECCurve ecc_curve;
	public final ECPoint ecc_point_g;
	public final ECDomainParameters ecc_bc_spec;
	public final ECKeyPairGenerator ecc_key_pair_generator;
	public final ECFieldElement ecc_gx_fieldelement;
	public final ECFieldElement ecc_gy_fieldelement;

	public SM2() 
	{
		this.ecc_p = new BigInteger(ecc_param[0], 16);
		this.ecc_a = new BigInteger(ecc_param[1], 16);
		this.ecc_b = new BigInteger(ecc_param[2], 16);
		this.ecc_n = new BigInteger(ecc_param[3], 16);
		this.ecc_gx = new BigInteger(ecc_param[4], 16);
		this.ecc_gy = new BigInteger(ecc_param[5], 16);

		this.ecc_gx_fieldelement = new Fp(this.ecc_p, this.ecc_gx);
		this.ecc_gy_fieldelement = new Fp(this.ecc_p, this.ecc_gy);

		this.ecc_curve = new ECCurve.Fp(this.ecc_p, this.ecc_a, this.ecc_b);
		this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement, this.ecc_gy_fieldelement);

		this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n);

		ECKeyGenerationParameters ecc_ecgenparam;
		ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom());

		this.ecc_key_pair_generator = new ECKeyPairGenerator();
		this.ecc_key_pair_generator.init(ecc_ecgenparam);
	}
}

b.      SM2工具类

【SM2Utils.java】

 

package com.mlq.sm;

import java.io.IOException;
import java.math.BigInteger;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECPoint;

public class SM2Utils 
{
	//生成随机秘钥对
	public static void generateKeyPair(){
		SM2 sm2 = SM2.Instance();
		AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair();
		ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate();
		ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic();
		BigInteger privateKey = ecpriv.getD();
		ECPoint publicKey = ecpub.getQ();
		
		System.out.println("公钥: " + Util.byteToHex(publicKey.getEncoded()));
		System.out.println("私钥: " + Util.byteToHex(privateKey.toByteArray()));
	}
	
	//数据加密
	public static String encrypt(byte[] publicKey, byte[] data) throws IOException
	{
		if (publicKey == null || publicKey.length == 0)
		{
			return null;
		}
		
		if (data == null || data.length == 0)
		{
			return null;
		}
		
		byte[] source = new byte[data.length];
		System.arraycopy(data, 0, source, 0, data.length);
		
		Cipher cipher = new Cipher();
		SM2 sm2 = SM2.Instance();
		ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey);
		
		ECPoint c1 = cipher.Init_enc(sm2, userKey);
		cipher.Encrypt(source);
		byte[] c3 = new byte[32];
		cipher.Dofinal(c3);
		
//		System.out.println("C1 " + Util.byteToHex(c1.getEncoded()));
//		System.out.println("C2 " + Util.byteToHex(source));
//		System.out.println("C3 " + Util.byteToHex(c3));
		//C1 C2 C3拼装成加密字串
		return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(source) + Util.byteToHex(c3);
		
	}
	
	//数据解密
	public static byte[] decrypt(byte[] privateKey, byte[] encryptedData) throws IOException
	{
		if (privateKey == null || privateKey.length == 0)
		{
			return null;
		}
		
		if (encryptedData == null || encryptedData.length == 0)
		{
			return null;
		}
		//加密字节数组转换为十六进制的字符串 长度变为encryptedData.length * 2
		String data = Util.byteToHex(encryptedData);
		/***分解加密字串
		 * （C1 = C1标志位2位 + C1实体部分128位 = 130）
		 * （C3 = C3实体部分64位  = 64）
		 * （C2 = encryptedData.length * 2 - C1长度  - C2长度）
		 */
		byte[] c1Bytes = Util.hexToByte(data.substring(0,130));
		int c2Len = encryptedData.length - 97;
		byte[] c2 = Util.hexToByte(data.substring(130,130 + 2 * c2Len));
		byte[] c3 = Util.hexToByte(data.substring(130 + 2 * c2Len,194 + 2 * c2Len));
		
		SM2 sm2 = SM2.Instance();
		BigInteger userD = new BigInteger(1, privateKey);
		
		//通过C1实体字节来生成ECPoint
		ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes);
		Cipher cipher = new Cipher();
		cipher.Init_dec(userD, c1);
		cipher.Decrypt(c2);
		cipher.Dofinal(c3);
		
		//返回解密结果
		return c2;
	}
	
	public static void main(String[] args) throws Exception 
	{
		//生成密钥对
		generateKeyPair();
		
		String plainText = "ererfeiisgod";
		byte[] sourceData = plainText.getBytes();
		
		//下面的秘钥可以使用generateKeyPair()生成的秘钥内容
		// 国密规范正式私钥
		String prik = "3690655E33D5EA3D9A4AE1A1ADD766FDEA045CDEAA43A9206FB8C430CEFE0D94";
		// 国密规范正式公钥
		String pubk = "04F6E0C3345AE42B51E06BF50B98834988D54EBC7460FE135A48171BC0629EAE205EEDE253A530608178A98F1E19BB737302813BA39ED3FA3C51639D7A20C7391A";
		
		System.out.println("加密: ");
		String cipherText = SM2Utils.encrypt(Util.hexToByte(pubk), sourceData);
		System.out.println(cipherText);
		System.out.println("解密: ");
		plainText = new String(SM2Utils.decrypt(Util.hexToByte(prik), Util.hexToByte(cipherText)));
		System.out.println(plainText);
		
	}
}

c.      SM3主类

【SM3.java】

 

package com.mlq.sm;

public class SM3 
{
	public static final byte[] iv = { 0x73, (byte) 0x80, 0x16, 0x6f, 0x49,
		0x14, (byte) 0xb2, (byte) 0xb9, 0x17, 0x24, 0x42, (byte) 0xd7,
		(byte) 0xda, (byte) 0x8a, 0x06, 0x00, (byte) 0xa9, 0x6f, 0x30,
		(byte) 0xbc, (byte) 0x16, 0x31, 0x38, (byte) 0xaa, (byte) 0xe3,
		(byte) 0x8d, (byte) 0xee, 0x4d, (byte) 0xb0, (byte) 0xfb, 0x0e,
		0x4e };
	
	public static int[] Tj = new int[64];
	
	static 
	{
		for (int i = 0; i < 16; i++) 
		{
			Tj[i] = 0x79cc4519;
		}
	
		for (int i = 16; i < 64; i++) 
		{
			Tj[i] = 0x7a879d8a;
		}
	}

	public static byte[] CF(byte[] V, byte[] B) 
	{
		int[] v, b;
		v = convert(V);
		b = convert(B);
		return convert(CF(v, b));
	}

	private static int[] convert(byte[] arr)
	{
		int[] out = new int[arr.length / 4];
		byte[] tmp = new byte[4];
		for (int i = 0; i < arr.length; i += 4) 
		{
			System.arraycopy(arr, i, tmp, 0, 4);
			out[i / 4] = bigEndianByteToInt(tmp);
		}
		return out;
	}

	private static byte[] convert(int[] arr) 
	{
		byte[] out = new byte[arr.length * 4];
		byte[] tmp = null;
		for (int i = 0; i < arr.length; i++) 
		{
			tmp = bigEndianIntToByte(arr[i]);
			System.arraycopy(tmp, 0, out, i * 4, 4);
		}
		return out;
	}

	public static int[] CF(int[] V, int[] B) 
	{
		int a, b, c, d, e, f, g, h;
		int ss1, ss2, tt1, tt2;
		a = V[0];
		b = V[1];
		c = V[2];
		d = V[3];
		e = V[4];
		f = V[5];
		g = V[6];
		h = V[7];
		
		int[][] arr = expand(B);
		int[] w = arr[0];
		int[] w1 = arr[1];
		
		for (int j = 0; j < 64; j++)
		{
			ss1 = (bitCycleLeft(a, 12) + e + bitCycleLeft(Tj[j], j));
			ss1 = bitCycleLeft(ss1, 7);
			ss2 = ss1 ^ bitCycleLeft(a, 12);
			tt1 = FFj(a, b, c, j) + d + ss2 + w1[j];
			tt2 = GGj(e, f, g, j) + h + ss1 + w[j];
			d = c;
			c = bitCycleLeft(b, 9);
			b = a;
			a = tt1;
			h = g;
			g = bitCycleLeft(f, 19);
			f = e;
			e = P0(tt2);

			/*System.out.print(j+" ");
			System.out.print(Integer.toHexString(a)+" ");
			System.out.print(Integer.toHexString(b)+" ");
			System.out.print(Integer.toHexString(c)+" ");
			System.out.print(Integer.toHexString(d)+" ");
			System.out.print(Integer.toHexString(e)+" ");
			System.out.print(Integer.toHexString(f)+" ");
			System.out.print(Integer.toHexString(g)+" ");
			System.out.print(Integer.toHexString(h)+" ");
			System.out.println("");*/
		}
//		System.out.println("");

		int[] out = new int[8];
		out[0] = a ^ V[0];
		out[1] = b ^ V[1];
		out[2] = c ^ V[2];
		out[3] = d ^ V[3];
		out[4] = e ^ V[4];
		out[5] = f ^ V[5];
		out[6] = g ^ V[6];
		out[7] = h ^ V[7];

		return out;
	}

	private static int[][] expand(int[] B) 
	{
		int W[] = new int[68];
		int W1[] = new int[64];
		for (int i = 0; i < B.length; i++)
		{
			W[i] = B[i];
		}

		for (int i = 16; i < 68; i++) 
		{
			W[i] = P1(W[i - 16] ^ W[i - 9] ^ bitCycleLeft(W[i - 3], 15))
					^ bitCycleLeft(W[i - 13], 7) ^ W[i - 6];
		}

		for (int i = 0; i < 64; i++) 
		{
			W1[i] = W[i] ^ W[i + 4];
		}

		int arr[][] = new int[][] { W, W1 };
		return arr;
	}

	private static byte[] bigEndianIntToByte(int num) 
	{
		return back(Util.intToBytes(num));
	}

	private static int bigEndianByteToInt(byte[] bytes)
	{
		return Util.byteToInt(back(bytes));
	}

	private static int FFj(int X, int Y, int Z, int j) 
	{
		if (j >= 0 && j <= 15) 
		{
			return FF1j(X, Y, Z);
		}
		else 
		{
			return FF2j(X, Y, Z);
		}
	}

	private static int GGj(int X, int Y, int Z, int j) 
	{
		if (j >= 0 && j <= 15) 
		{
			return GG1j(X, Y, Z);
		}
		else
		{
			return GG2j(X, Y, Z);
		}
	}

	// 逻辑位运算函数
	private static int FF1j(int X, int Y, int Z)
	{
		int tmp = X ^ Y ^ Z;
		return tmp;
	}

	private static int FF2j(int X, int Y, int Z)
	{
		int tmp = ((X & Y) | (X & Z) | (Y & Z));
		return tmp;
	}

	private static int GG1j(int X, int Y, int Z) 
	{
		int tmp = X ^ Y ^ Z;
		return tmp;
	}

	private static int GG2j(int X, int Y, int Z) 
	{
		int tmp = (X & Y) | (~X & Z);
		return tmp;
	}

	private static int P0(int X) 
	{
		int y = rotateLeft(X, 9);
		y = bitCycleLeft(X, 9);
		int z = rotateLeft(X, 17);
		z = bitCycleLeft(X, 17);
		int t = X ^ y ^ z;
		return t;
	}

	private static int P1(int X) 
	{
		int t = X ^ bitCycleLeft(X, 15) ^ bitCycleLeft(X, 23);
		return t;
	}

	/**
	 * 对最后一个分组字节数据padding
	 * 
	 * @param in
	 * @param bLen
	 *            分组个数
	 * @return
	 */
	public static byte[] padding(byte[] in, int bLen)
	{
		int k = 448 - (8 * in.length + 1) % 512;
		if (k < 0) 
		{
			k = 960 - (8 * in.length + 1) % 512;
		}
		k += 1;
		byte[] padd = new byte[k / 8];
		padd[0] = (byte) 0x80;
		long n = in.length * 8 + bLen * 512;
		byte[] out = new byte[in.length + k / 8 + 64 / 8];
		int pos = 0;
		System.arraycopy(in, 0, out, 0, in.length);
		pos += in.length;
		System.arraycopy(padd, 0, out, pos, padd.length);
		pos += padd.length;
		byte[] tmp = back(Util.longToBytes(n));
		System.arraycopy(tmp, 0, out, pos, tmp.length);
		return out;
	}

	/**
	 * 字节数组逆序
	 * 
	 * @param in
	 * @return
	 */
	private static byte[] back(byte[] in) 
	{
		byte[] out = new byte[in.length];
		for (int i = 0; i < out.length; i++) 
		{
			out[i] = in[out.length - i - 1];
		}

		return out;
	}

	public static int rotateLeft(int x, int n) 
	{
		return (x << n) | (x >> (32 - n));
	}

	private static int bitCycleLeft(int n, int bitLen) 
	{
		bitLen %= 32;
		byte[] tmp = bigEndianIntToByte(n);
		int byteLen = bitLen / 8;
		int len = bitLen % 8;
		if (byteLen > 0)
		{
			tmp = byteCycleLeft(tmp, byteLen);
		}

		if (len > 0) 
		{
			tmp = bitSmall8CycleLeft(tmp, len);
		}

		return bigEndianByteToInt(tmp);
	}

	private static byte[] bitSmall8CycleLeft(byte[] in, int len) 
	{
		byte[] tmp = new byte[in.length];
		int t1, t2, t3;
		for (int i = 0; i < tmp.length; i++)
		{
			t1 = (byte) ((in[i] & 0x000000ff) << len);
			t2 = (byte) ((in[(i + 1) % tmp.length] & 0x000000ff) >> (8 - len));
			t3 = (byte) (t1 | t2);
			tmp[i] = (byte) t3;
		}

		return tmp;
	}

	private static byte[] byteCycleLeft(byte[] in, int byteLen) 
	{
		byte[] tmp = new byte[in.length];
		System.arraycopy(in, byteLen, tmp, 0, in.length - byteLen);
		System.arraycopy(in, 0, tmp, in.length - byteLen, byteLen);
		return tmp;
	}
}

d.      SM3工具类

【SM3Digest.java】

 

package com.mlq.sm;

import org.bouncycastle.util.encoders.Hex;

public class SM3Digest
{
	/** SM3值的长度 */
	private static final int BYTE_LENGTH = 32;
	
	/** SM3分组长度 */
	private static final int BLOCK_LENGTH = 64;
	
	/** 缓冲区长度 */
	private static final int BUFFER_LENGTH = BLOCK_LENGTH * 1;
	
	/** 缓冲区 */
	private byte[] xBuf = new byte[BUFFER_LENGTH];
	
	/** 缓冲区偏移量 */
	private int xBufOff;
	
	/** 初始向量 */
	private byte[] V = SM3.iv.clone();
	
	private int cntBlock = 0;

	public SM3Digest() {
	}

	public SM3Digest(SM3Digest t)
	{
		System.arraycopy(t.xBuf, 0, this.xBuf, 0, t.xBuf.length);
		this.xBufOff = t.xBufOff;
		System.arraycopy(t.V, 0, this.V, 0, t.V.length);
	}
	
	/**
	 * SM3结果输出
	 * 
	 * @param out 保存SM3结构的缓冲区
	 * @param outOff 缓冲区偏移量
	 * @return
	 */
	public int doFinal(byte[] out, int outOff) 
	{
		byte[] tmp = doFinal();
		System.arraycopy(tmp, 0, out, 0, tmp.length);
		return BYTE_LENGTH;
	}

	public void reset() 
	{
		xBufOff = 0;
		cntBlock = 0;
		V = SM3.iv.clone();
	}

	/**
	 * 明文输入
	 * 
	 * @param in
	 *            明文输入缓冲区
	 * @param inOff
	 *            缓冲区偏移量
	 * @param len
	 *            明文长度
	 */
	public void update(byte[] in, int inOff, int len)
	{
		int partLen = BUFFER_LENGTH - xBufOff;
		int inputLen = len;
		int dPos = inOff;
		if (partLen < inputLen) 
		{
			System.arraycopy(in, dPos, xBuf, xBufOff, partLen);
			inputLen -= partLen;
			dPos += partLen;
			doUpdate();
			while (inputLen > BUFFER_LENGTH) 
			{
				System.arraycopy(in, dPos, xBuf, 0, BUFFER_LENGTH);
				inputLen -= BUFFER_LENGTH;
				dPos += BUFFER_LENGTH;
				doUpdate();
			}
		}

		System.arraycopy(in, dPos, xBuf, xBufOff, inputLen);
		xBufOff += inputLen;
	}

	private void doUpdate() 
	{
		byte[] B = new byte[BLOCK_LENGTH];
		for (int i = 0; i < BUFFER_LENGTH; i += BLOCK_LENGTH) 
		{
			System.arraycopy(xBuf, i, B, 0, B.length);
			doHash(B);
		}
		xBufOff = 0;
	}

	private void doHash(byte[] B)
	{
		byte[] tmp = SM3.CF(V, B);
		System.arraycopy(tmp, 0, V, 0, V.length);
		cntBlock++;
	}

	private byte[] doFinal() 
	{
		byte[] B = new byte[BLOCK_LENGTH];
		byte[] buffer = new byte[xBufOff];
		System.arraycopy(xBuf, 0, buffer, 0, buffer.length);
		byte[] tmp = SM3.padding(buffer, cntBlock);
		for (int i = 0; i < tmp.length; i += BLOCK_LENGTH)
		{
			System.arraycopy(tmp, i, B, 0, B.length);
			doHash(B);
		}
		return V;
	}

	public void update(byte in) 
	{
		byte[] buffer = new byte[] { in };
		update(buffer, 0, 1);
	}
	
	public int getDigestSize() 
	{
		return BYTE_LENGTH;
	}
	
	public static void main(String[] args) 
	{
		byte[] md = new byte[32];
		byte[] msg1 = "ererfeiisgod".getBytes();
		SM3Digest sm3 = new SM3Digest();
		sm3.update(msg1, 0, msg1.length);
		sm3.doFinal(md, 0);
		String s = new String(Hex.encode(md));
		System.out.println(s.toUpperCase());
	}
}

e.      工具类

【Util.java】

package com.mlq.sm;

import java.math.BigInteger;

public class Util 
{
	/**
	 * 整形转换成网络传输的字节流（字节数组）型数据
	 * 
	 * @param num 一个整型数据
	 * @return 4个字节的自己数组
	 */
	public static byte[] intToBytes(int num)
	{
		byte[] bytes = new byte[4];
		bytes[0] = (byte) (0xff & (num >> 0));
		bytes[1] = (byte) (0xff & (num >> 8));
		bytes[2] = (byte) (0xff & (num >> 16));
		bytes[3] = (byte) (0xff & (num >> 24));
		return bytes;
	}

	/**
	 * 四个字节的字节数据转换成一个整形数据
	 * 
	 * @param bytes 4个字节的字节数组
	 * @return 一个整型数据
	 */
	public static int byteToInt(byte[] bytes) 
	{
		int num = 0;
		int temp;
		temp = (0x000000ff & (bytes[0])) << 0;
		num = num | temp;
		temp = (0x000000ff & (bytes[1])) << 8;
		num = num | temp;
		temp = (0x000000ff & (bytes[2])) << 16;
		num = num | temp;
		temp = (0x000000ff & (bytes[3])) << 24;
		num = num | temp;
		return num;
	}

	/**
	 * 长整形转换成网络传输的字节流（字节数组）型数据
	 * 
	 * @param num 一个长整型数据
	 * @return 4个字节的自己数组
	 */
	public static byte[] longToBytes(long num) 
	{
		byte[] bytes = new byte[8];
		for (int i = 0; i < 8; i++) 
		{
			bytes[i] = (byte) (0xff & (num >> (i * 8)));
		}

		return bytes;
	}

	/**
	 * 大数字转换字节流（字节数组）型数据
	 * 
	 * @param n
	 * @return
	 */
	public static byte[] byteConvert32Bytes(BigInteger n) 
	{
		byte tmpd[] = (byte[])null;
        if(n == null)
        {
        	return null;
        }
        
        if(n.toByteArray().length == 33)
        {
            tmpd = new byte[32];
            System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
        } 
        else if(n.toByteArray().length == 32)
        {
            tmpd = n.toByteArray();
        } 
        else
        {
            tmpd = new byte[32];
            for(int i = 0; i < 32 - n.toByteArray().length; i++)
            {
            	tmpd[i] = 0;
            }
            System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);
        }
        return tmpd;
	}
	
	/**
	 * 换字节流（字节数组）型数据转大数字
	 * 
	 * @param b
	 * @return
	 */
	public static BigInteger byteConvertInteger(byte[] b)
	{
	    if (b[0] < 0)
	    {
	    	byte[] temp = new byte[b.length + 1];
	    	temp[0] = 0;
	    	System.arraycopy(b, 0, temp, 1, b.length);
	    	return new BigInteger(temp);
	    }
	    return new BigInteger(b);
	}
	
	/**
	 * 根据字节数组获得值(十六进制数字)
	 * 
	 * @param bytes
	 * @return
	 */
	public static String getHexString(byte[] bytes) 
	{
		return getHexString(bytes, true);
	}
	
	/**
	 * 根据字节数组获得值(十六进制数字)
	 * 
	 * @param bytes
	 * @param upperCase
	 * @return
	 */
	public static String getHexString(byte[] bytes, boolean upperCase) 
	{
		String ret = "";
		for (int i = 0; i < bytes.length; i++) 
		{
			ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);
		}
		return upperCase ? ret.toUpperCase() : ret;
	}
	
	/**
	 * 打印十六进制字符串
	 * 
	 * @param bytes
	 */
	public static void printHexString(byte[] bytes) 
	{
		for (int i = 0; i < bytes.length; i++) 
		{
			String hex = Integer.toHexString(bytes[i] & 0xFF);
			if (hex.length() == 1) 
			{
				hex = '0' + hex;
			}
			System.out.print("0x" + hex.toUpperCase() + ",");
		}
		System.out.println("");
	}
	
	/**
	 * Convert hex string to byte[]
	 * 
	 * @param hexString
	 *            the hex string
	 * @return byte[]
	 */
	public static byte[] hexStringToBytes(String hexString) 
	{
		if (hexString == null || hexString.equals("")) 
		{
			return null;
		}
		
		hexString = hexString.toUpperCase();
		int length = hexString.length() / 2;
		char[] hexChars = hexString.toCharArray();
		byte[] d = new byte[length];
		for (int i = 0; i < length; i++) 
		{
			int pos = i * 2;
			d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
		}
		return d;
	}
	
	/**
	 * Convert char to byte
	 * 
	 * @param c
	 *            char
	 * @return byte
	 */
	public static byte charToByte(char c) 
	{
		return (byte) "0123456789ABCDEF".indexOf(c);
	}
	
	/**
     * 用于建立十六进制字符的输出的小写字符数组
     */
    private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 
    /**
     * 用于建立十六进制字符的输出的大写字符数组
     */
    private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
 
    /**
     * 将字节数组转换为十六进制字符数组
     *
     * @param data byte[]
     * @return 十六进制char[]
     */
    public static char[] encodeHex(byte[] data) {
        return encodeHex(data, true);
    }
 
    /**
     * 将字节数组转换为十六进制字符数组
     *
     * @param data        byte[]
     * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
     * @return 十六进制char[]
     */
    public static char[] encodeHex(byte[] data, boolean toLowerCase) {
        return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
    }
 
    /**
     * 将字节数组转换为十六进制字符数组
     *
     * @param data     byte[]
     * @param toDigits 用于控制输出的char[]
     * @return 十六进制char[]
     */
    protected static char[] encodeHex(byte[] data, char[] toDigits) {
        int l = data.length;
        char[] out = new char[l << 1];
        // two characters form the hex value.
        for (int i = 0, j = 0; i < l; i++) {
            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
            out[j++] = toDigits[0x0F & data[i]];
        }
        return out;
    }
 
    /**
     * 将字节数组转换为十六进制字符串
     *
     * @param data byte[]
     * @return 十六进制String
     */
    public static String encodeHexString(byte[] data) {
        return encodeHexString(data, true);
    }
 
    /**
     * 将字节数组转换为十六进制字符串
     *
     * @param data        byte[]
     * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
     * @return 十六进制String
     */
    public static String encodeHexString(byte[] data, boolean toLowerCase) {
        return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
    }
 
    /**
     * 将字节数组转换为十六进制字符串
     *
     * @param data     byte[]
     * @param toDigits 用于控制输出的char[]
     * @return 十六进制String
     */
    protected static String encodeHexString(byte[] data, char[] toDigits) {
        return new String(encodeHex(data, toDigits));
    }
 
    /**
     * 将十六进制字符数组转换为字节数组
     *
     * @param data 十六进制char[]
     * @return byte[]
     * @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
     */
    public static byte[] decodeHex(char[] data) {
        int len = data.length;
 
        if ((len & 0x01) != 0) {
            throw new RuntimeException("Odd number of characters.");
        }
 
        byte[] out = new byte[len >> 1];
 
        // two characters form the hex value.
        for (int i = 0, j = 0; j < len; i++) {
            int f = toDigit(data[j], j) << 4;
            j++;
            f = f | toDigit(data[j], j);
            j++;
            out[i] = (byte) (f & 0xFF);
        }
 
        return out;
    }
 
    /**
     * 将十六进制字符转换成一个整数
     *
     * @param ch    十六进制char
     * @param index 十六进制字符在字符数组中的位置
     * @return 一个整数
     * @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常
     */
    protected static int toDigit(char ch, int index) {
        int digit = Character.digit(ch, 16);
        if (digit == -1) {
            throw new RuntimeException("Illegal hexadecimal character " + ch
                    + " at index " + index);
        }
        return digit;
    }
 
    /**
     * 数字字符串转ASCII码字符串
     * 
     * @param String
     *            字符串
     * @return ASCII字符串
     */
    public static String StringToAsciiString(String content) {
        String result = "";
        int max = content.length();
        for (int i = 0; i < max; i++) {
            char c = content.charAt(i);
            String b = Integer.toHexString(c);
            result = result + b;
        }
        return result;
    }
    
    /**
     * 十六进制转字符串
     * 
     * @param hexString
     *            十六进制字符串
     * @param encodeType
     *            编码类型4：Unicode，2：普通编码
     * @return 字符串
     */
    public static String hexStringToString(String hexString, int encodeType) {
        String result = "";
        int max = hexString.length() / encodeType;
        for (int i = 0; i < max; i++) {
            char c = (char) hexStringToAlgorism(hexString
                    .substring(i * encodeType, (i + 1) * encodeType));
            result += c;
        }
        return result;
    }
    
    /**
     * 十六进制字符串装十进制
     * 
     * @param hex
     *            十六进制字符串
     * @return 十进制数值
     */
    public static int hexStringToAlgorism(String hex) {
        hex = hex.toUpperCase();
        int max = hex.length();
        int result = 0;
        for (int i = max; i > 0; i--) {
            char c = hex.charAt(i - 1);
            int algorism = 0;
            if (c >= '0' && c <= '9') {
                algorism = c - '0';
            } else {
                algorism = c - 55;
            }
            result += Math.pow(16, max - i) * algorism;
        }
        return result;
    }
    
    /**
     * 十六转二进制
     * 
     * @param hex
     *            十六进制字符串
     * @return 二进制字符串
     */
    public static String hexStringToBinary(String hex) {
        hex = hex.toUpperCase();
        String result = "";
        int max = hex.length();
        for (int i = 0; i < max; i++) {
            char c = hex.charAt(i);
            switch (c) {
            case '0':
                result += "0000";
                break;
            case '1':
                result += "0001";
                break;
            case '2':
                result += "0010";
                break;
            case '3':
                result += "0011";
                break;
            case '4':
                result += "0100";
                break;
            case '5':
                result += "0101";
                break;
            case '6':
                result += "0110";
                break;
            case '7':
                result += "0111";
                break;
            case '8':
                result += "1000";
                break;
            case '9':
                result += "1001";
                break;
            case 'A':
                result += "1010";
                break;
            case 'B':
                result += "1011";
                break;
            case 'C':
                result += "1100";
                break;
            case 'D':
                result += "1101";
                break;
            case 'E':
                result += "1110";
                break;
            case 'F':
                result += "1111";
                break;
            }
        }
        return result;
    }
    
    /**
     * ASCII码字符串转数字字符串
     * 
     * @param String
     *            ASCII字符串
     * @return 字符串
     */
    public static String AsciiStringToString(String content) {
        String result = "";
        int length = content.length() / 2;
        for (int i = 0; i < length; i++) {
            String c = content.substring(i * 2, i * 2 + 2);
            int a = hexStringToAlgorism(c);
            char b = (char) a;
            String d = String.valueOf(b);
            result += d;
        }
        return result;
    }
    
    /**
     * 将十进制转换为指定长度的十六进制字符串
     * 
     * @param algorism
     *            int 十进制数字
     * @param maxLength
     *            int 转换后的十六进制字符串长度
     * @return String 转换后的十六进制字符串
     */
    public static String algorismToHexString(int algorism, int maxLength) {
        String result = "";
        result = Integer.toHexString(algorism);

        if (result.length() % 2 == 1) {
            result = "0" + result;
        }
        return patchHexString(result.toUpperCase(), maxLength);
    }
    
    /**
     * 字节数组转为普通字符串（ASCII对应的字符）
     * 
     * @param bytearray
     *            byte[]
     * @return String
     */
    public static String byteToString(byte[] bytearray) {
        String result = "";
        char temp;

        int length = bytearray.length;
        for (int i = 0; i < length; i++) {
            temp = (char) bytearray[i];
            result += temp;
        }
        return result;
    }
    
    /**
     * 二进制字符串转十进制
     * 
     * @param binary
     *            二进制字符串
     * @return 十进制数值
     */
    public static int binaryToAlgorism(String binary) {
        int max = binary.length();
        int result = 0;
        for (int i = max; i > 0; i--) {
            char c = binary.charAt(i - 1);
            int algorism = c - '0';
            result += Math.pow(2, max - i) * algorism;
        }
        return result;
    }

    /**
     * 十进制转换为十六进制字符串
     * 
     * @param algorism
     *            int 十进制的数字
     * @return String 对应的十六进制字符串
     */
    public static String algorismToHEXString(int algorism) {
        String result = "";
        result = Integer.toHexString(algorism);

        if (result.length() % 2 == 1) {
            result = "0" + result;

        }
        result = result.toUpperCase();

        return result;
    }
    
    /**
     * HEX字符串前补0，主要用于长度位数不足。
     * 
     * @param str
     *            String 需要补充长度的十六进制字符串
     * @param maxLength
     *            int 补充后十六进制字符串的长度
     * @return 补充结果
     */
    static public String patchHexString(String str, int maxLength) {
        String temp = "";
        for (int i = 0; i < maxLength - str.length(); i++) {
            temp = "0" + temp;
        }
        str = (temp + str).substring(0, maxLength);
        return str;
    }
    
    /**
     * 将一个字符串转换为int
     * 
     * @param s
     *            String 要转换的字符串
     * @param defaultInt
     *            int 如果出现异常,默认返回的数字
     * @param radix
     *            int 要转换的字符串是什么进制的,如16 8 10.
     * @return int 转换后的数字
     */
    public static int parseToInt(String s, int defaultInt, int radix) {
        int i = 0;
        try {
            i = Integer.parseInt(s, radix);
        } catch (NumberFormatException ex) {
            i = defaultInt;
        }
        return i;
    }
    
    /**
     * 将一个十进制形式的数字字符串转换为int
     * 
     * @param s
     *            String 要转换的字符串
     * @param defaultInt
     *            int 如果出现异常,默认返回的数字
     * @return int 转换后的数字
     */
    public static int parseToInt(String s, int defaultInt) {
        int i = 0;
        try {
            i = Integer.parseInt(s);
        } catch (NumberFormatException ex) {
            i = defaultInt;
        }
        return i;
    }
    
    /**
     * 十六进制串转化为byte数组
     * 
     * @return the array of byte
     */
    public static byte[] hexToByte(String hex)
            throws IllegalArgumentException {
        if (hex.length() % 2 != 0) {
            throw new IllegalArgumentException();
        }
        char[] arr = hex.toCharArray();
        byte[] b = new byte[hex.length() / 2];
        for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
            String swap = "" + arr[i++] + arr[i];
            int byteint = Integer.parseInt(swap, 16) & 0xFF;
            b[j] = new Integer(byteint).byteValue();
        }
        return b;
    }
    
    /**
     * 字节数组转换为十六进制字符串
     * 
     * @param b
     *            byte[] 需要转换的字节数组
     * @return String 十六进制字符串
     */
    public static String byteToHex(byte b[]) {
        if (b == null) {
            throw new IllegalArgumentException(
                    "Argument b ( byte array ) is null! ");
        }
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = Integer.toHexString(b[n] & 0xff);
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
        }
        return hs.toUpperCase();
    }
    
    public static byte[] subByte(byte[] input, int startIndex, int length) {
		byte[] bt = new byte[length];
		for (int i = 0; i < length; i++) {
			bt[i] = input[i + startIndex];
		}
		return bt;
    }
}

2.SM4

直接上代码：

a.      SM4主类

【SM4.java】

 

package com.mlq.sm;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

public class SM4 
{
	public static final int SM4_ENCRYPT = 1;
	
	public static final int SM4_DECRYPT = 0;

	private long GET_ULONG_BE(byte[] b, int i) 
	{
		long n = (long)(b[i] & 0xff) << 24 | (long)((b[i + 1] & 0xff) << 16) | (long)((b[i + 2] & 0xff) << 8) | (long)(b[i + 3] & 0xff) & 0xffffffffL;
		return n;
	}

	private void PUT_ULONG_BE(long n, byte[] b, int i) 
	{
		b[i] = (byte)(int)(0xFF & n >> 24);
        b[i + 1] = (byte)(int)(0xFF & n >> 16);
        b[i + 2] = (byte)(int)(0xFF & n >> 8);
        b[i + 3] = (byte)(int)(0xFF & n);
	}

	private long SHL(long x, int n) 
	{
		return (x & 0xFFFFFFFF) << n;
	}
	
	private long ROTL(long x, int n) 
	{
		return SHL(x, n) | x >> (32 - n);
	}
	
	private void SWAP(long[] sk, int i)
	{
		long t = sk[i];
		sk[i] = sk[(31 - i)];
		sk[(31 - i)] = t;
	}
	
	public static final byte[] SboxTable = { (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 };
	
	public static final int[] FK = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc };
	
	public static final 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 byte sm4Sbox(byte inch)
	{
		int i = inch & 0xFF;
		byte retVal = SboxTable[i];
		return retVal;
	}

	private long sm4Lt(long ka) 
	{
		long bb = 0L;
		long c = 0L;
		byte[] a = new byte[4];
		byte[] b = new byte[4];
		PUT_ULONG_BE(ka, a, 0);
		b[0] = sm4Sbox(a[0]);
		b[1] = sm4Sbox(a[1]);
		b[2] = sm4Sbox(a[2]);
		b[3] = sm4Sbox(a[3]);
		bb = GET_ULONG_BE(b, 0);
		c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24);
		return c;
	}

	private long sm4F(long x0, long x1, long x2, long x3, long rk)
	{
		return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk);
	}

	private long sm4CalciRK(long ka) 
	{
		long bb = 0L;
		long rk = 0L;
		byte[] a = new byte[4];
		byte[] b = new byte[4];
		PUT_ULONG_BE(ka, a, 0);
		b[0] = sm4Sbox(a[0]);
		b[1] = sm4Sbox(a[1]);
		b[2] = sm4Sbox(a[2]);
		b[3] = sm4Sbox(a[3]);
		bb = GET_ULONG_BE(b, 0);
		rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23);
		return rk;
	}

	private void sm4_setkey(long[] SK, byte[] key) 
	{
		long[] MK = new long[4];
		long[] k = new long[36];
		int i = 0;
		MK[0] = GET_ULONG_BE(key, 0);
		MK[1] = GET_ULONG_BE(key, 4);
		MK[2] = GET_ULONG_BE(key, 8);
		MK[3] = GET_ULONG_BE(key, 12);
		k[0] = MK[0] ^ (long) FK[0];
		k[1] = MK[1] ^ (long) FK[1];
		k[2] = MK[2] ^ (long) FK[2];
		k[3] = MK[3] ^ (long) FK[3];
		for (; i < 32; i++) 
		{
			k[(i + 4)] = (k[i] ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (long) CK[i]));
			SK[i] = k[(i + 4)];
		}
	}

	private void sm4_one_round(long[] sk, byte[] input, byte[] output) 
	{
		int i = 0;
		long[] ulbuf = new long[36];
		ulbuf[0] = GET_ULONG_BE(input, 0);
		ulbuf[1] = GET_ULONG_BE(input, 4);
		ulbuf[2] = GET_ULONG_BE(input, 8);
		ulbuf[3] = GET_ULONG_BE(input, 12);
		while (i < 32)
		{
			ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
			i++;
		}
		PUT_ULONG_BE(ulbuf[35], output, 0);
		PUT_ULONG_BE(ulbuf[34], output, 4);
		PUT_ULONG_BE(ulbuf[33], output, 8);
		PUT_ULONG_BE(ulbuf[32], output, 12);
	}

	private byte[] padding(byte[] input, int mode)
	{
		if (input == null) 
		{
			return null;
		}
		
		byte[] ret = (byte[]) null;
		if (mode == SM4_ENCRYPT) 
		{
			int p = 16 - input.length % 16;
			ret = new byte[input.length + p];
			System.arraycopy(input, 0, ret, 0, input.length);
			for (int i = 0; i < p; i++) 
			{
				ret[input.length + i] = (byte) p;
			}
		} 
		else 
		{
			int p = input[input.length - 1];
			ret = new byte[input.length - p];
			System.arraycopy(input, 0, ret, 0, input.length - p);
		}
		return ret;
	}

	public void sm4_setkey_enc(SM4_Context ctx, byte[] key) throws Exception
	{
		if (ctx == null) 
		{
			throw new Exception("ctx is null!");
		}
		
		if (key == null || key.length != 16) 
		{
			throw new Exception("key error!");
		}
		
		ctx.mode = SM4_ENCRYPT;
		sm4_setkey(ctx.sk, key);
	}

	public void sm4_setkey_dec(SM4_Context ctx, byte[] key) throws Exception
	{
		if (ctx == null) 
		{
			throw new Exception("ctx is null!");
		}
		
		if (key == null || key.length != 16) 
		{
			throw new Exception("key error!");
		}
		
		int i = 0;
		ctx.mode = SM4_DECRYPT;
		sm4_setkey(ctx.sk, key);
		for (i = 0; i < 16; i++) 
		{
			SWAP(ctx.sk, i);
		}
	}

	public byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input) throws Exception 
	{
		if (input == null) 
		{
			throw new Exception("input is null!");
		}
	
		if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT)) 
		{
			input = padding(input, SM4_ENCRYPT);
		}
		
		int length = input.length;
		ByteArrayInputStream bins = new ByteArrayInputStream(input);
		ByteArrayOutputStream bous = new ByteArrayOutputStream();
		for(; length > 0; length -= 16)
		{
			byte[] in = new byte[16];
			byte[] out = new byte[16];
			bins.read(in);
			sm4_one_round(ctx.sk, in, out);
			bous.write(out);
		}
		
		byte[] output = bous.toByteArray();
		if (ctx.isPadding && ctx.mode == SM4_DECRYPT) 
		{
			output = padding(output, SM4_DECRYPT);
		}
		bins.close();
		bous.close();
		return output;
	}

	public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input) throws Exception
	{
		if (iv == null || iv.length != 16)
		{
			throw new Exception("iv error!");
		}
		
		if (input == null) 
		{
			throw new Exception("input is null!");
		}
		
		if (ctx.isPadding && ctx.mode == SM4_ENCRYPT) 
		{
			input = padding(input, SM4_ENCRYPT);
		}
		
		int i = 0;
		int length = input.length;
		ByteArrayInputStream bins = new ByteArrayInputStream(input);
		ByteArrayOutputStream bous = new ByteArrayOutputStream();
		if (ctx.mode == SM4_ENCRYPT) 
		{
			for(; length > 0; length -= 16)
			{
				byte[] in = new byte[16];
				byte[] out = new byte[16];
				byte[] out1 = new byte[16];
				
				bins.read(in);
				for (i = 0; i < 16; i++) 
				{
					out[i] = ((byte) (in[i] ^ iv[i]));
				}
				sm4_one_round(ctx.sk, out, out1);
				System.arraycopy(out1, 0, iv, 0, 16);
				bous.write(out1);
			}
		} 
		else 
		{
			byte[] temp = new byte[16];
			for(; length > 0; length -= 16)
			{
				byte[] in = new byte[16];
				byte[] out = new byte[16];
				byte[] out1 = new byte[16];
				
				bins.read(in);
				System.arraycopy(in, 0, temp, 0, 16);
				sm4_one_round(ctx.sk, in, out);
				for (i = 0; i < 16; i++) 
				{
					out1[i] = ((byte) (out[i] ^ iv[i]));
				}
				System.arraycopy(temp, 0, iv, 0, 16);
				bous.write(out1);
			}
		}
		
		byte[] output = bous.toByteArray();
		if (ctx.isPadding && ctx.mode == SM4_DECRYPT) 
		{
			output = padding(output, SM4_DECRYPT);
		}
		bins.close();
		bous.close();
		return output;
	}
}

b.      SM4实体类

【SM4_Context.java】

 

package com.mlq.sm;

public class SM4_Context
{
	public int mode;
	
	public long[] sk;
	
	public boolean isPadding;

	public SM4_Context() 
	{
		this.mode = 1;
		this.isPadding = true;
		this.sk = new long[32];
	}
}

c.      SM4工具类(这里的PaddingMode采用的是PKCS7)

【SM4Utils.java】

 

package com.mlq.sm;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class SM4Utils
{
	private String secretKey = "";
	private String iv = "";
	private boolean hexString = false;
	
	public SM4Utils()
	{
	}
	
	public String encryptData_ECB(String plainText)
	{
		try 
		{
			SM4_Context ctx = new SM4_Context();
			ctx.isPadding = true;
			ctx.mode = SM4.SM4_ENCRYPT;
			
			byte[] keyBytes;
			if (hexString)
			{
				keyBytes = Util.hexStringToBytes(secretKey);
			}
			else
			{
				keyBytes = secretKey.getBytes();
			}
			
			SM4 sm4 = new SM4();
			sm4.sm4_setkey_enc(ctx, keyBytes);
			byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("GBK"));
			String cipherText = new BASE64Encoder().encode(encrypted);
			if (cipherText != null && cipherText.trim().length() > 0)
			{
				Pattern p = Pattern.compile("\\s*|\t|\r|\n");
				Matcher m = p.matcher(cipherText);
				cipherText = m.replaceAll("");
			}
			return cipherText;
		} 
		catch (Exception e) 
		{
			e.printStackTrace();
			return null;
		}
	}
	
	public String decryptData_ECB(String cipherText)
	{
		try 
		{
			SM4_Context ctx = new SM4_Context();
			ctx.isPadding = true;
			ctx.mode = SM4.SM4_DECRYPT;
			
			byte[] keyBytes;
			if (hexString)
			{
				keyBytes = Util.hexStringToBytes(secretKey);
			}
			else
			{
				keyBytes = secretKey.getBytes();
			}
			
			SM4 sm4 = new SM4();
			sm4.sm4_setkey_dec(ctx, keyBytes);
			byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText));
			return new String(decrypted, "GBK");
		} 
		catch (Exception e) 
		{
			e.printStackTrace();
			return null;
		}
	}
	
	public String encryptData_CBC(String plainText)
	{
		try 
		{
			SM4_Context ctx = new SM4_Context();
			ctx.isPadding = true;
			ctx.mode = SM4.SM4_ENCRYPT;
			
			byte[] keyBytes;
			byte[] ivBytes;
			if (hexString)
			{
				keyBytes = Util.hexStringToBytes(secretKey);
				ivBytes = Util.hexStringToBytes(iv);
			}
			else
			{
				keyBytes = secretKey.getBytes();
				ivBytes = iv.getBytes();
			}
			
			SM4 sm4 = new SM4();
			sm4.sm4_setkey_enc(ctx, keyBytes);
			byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("GBK"));
			String cipherText = new BASE64Encoder().encode(encrypted);
			if (cipherText != null && cipherText.trim().length() > 0)
			{
				Pattern p = Pattern.compile("\\s*|\t|\r|\n");
				Matcher m = p.matcher(cipherText);
				cipherText = m.replaceAll("");
			}
			return cipherText;
		} 
		catch (Exception e) 
		{
			e.printStackTrace();
			return null;
		}
	}
	
	public String decryptData_CBC(String cipherText)
	{
		try 
		{
			SM4_Context ctx = new SM4_Context();
			ctx.isPadding = true;
			ctx.mode = SM4.SM4_DECRYPT;
			
			byte[] keyBytes;
			byte[] ivBytes;
			if (hexString)
			{
				keyBytes = Util.hexStringToBytes(secretKey);
				ivBytes = Util.hexStringToBytes(iv);
			}
			else
			{
				keyBytes = secretKey.getBytes();
				ivBytes = iv.getBytes();
			}
			
			SM4 sm4 = new SM4();
			sm4.sm4_setkey_dec(ctx, keyBytes);
			byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));
			return new String(decrypted, "GBK");
		} 
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
	
	public static void main(String[] args) throws IOException 
	{
		String plainText = "ererfeiisgod";
		
		SM4Utils sm4 = new SM4Utils();
		sm4.secretKey = "JeF8U9wHFOMfs2Y8";
		sm4.hexString = false;
		
		System.out.println("ECB模式");
		String cipherText = sm4.encryptData_ECB(plainText);
		System.out.println("密文: " + cipherText);
		System.out.println("");
		
		plainText = sm4.decryptData_ECB(cipherText);
		System.out.println("明文: " + plainText);
		System.out.println("");
		
		System.out.println("CBC模式");
		sm4.iv = "UISwD9fW6cFh9SNS";
		cipherText = sm4.encryptData_CBC(plainText);
		System.out.println("密文: " + cipherText);
		System.out.println("");
		
		plainText = sm4.decryptData_CBC(cipherText);
		System.out.println("明文: " + plainText);
	}
}