Java加密算法汇总

Base64：

package com.cxlh.mm;

public class Base64 {
	final static String baseTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	/**
	 * Encode a byte array. 
	 * 
	 * @param bytes a byte array to be encoded. 
	 * @return encoded object as a String object. 
	 */
	public static String encode(byte[] bytes) {

		StringBuffer tmp = new StringBuffer();
		int i = 0;
		byte pos; 

		for(i=0; i < (bytes.length - bytes.length%3); i+=3) {

			pos = (byte) ((bytes[i] >> 2) & 63); 
			tmp.append(baseTable.charAt(pos)); 

			pos = (byte) (((bytes[i] & 3) << 4) + ((bytes[i+1] >> 4) & 15)); 
			tmp.append(baseTable.charAt( pos ));
					
			pos = (byte) (((bytes[i+1] & 15) << 2) + ((bytes[i+2]  >> 6) & 3));
			tmp.append(baseTable.charAt(pos));
		
			pos = (byte) (((bytes[i+2]) & 63));
			tmp.append(baseTable.charAt(pos));
		
			// Add a new line for each 76 chars. 
			// 76*3/4 = 57
			if(((i+2)%56) == 0) {
				tmp.append("\r\n");
			}
		}

		if(bytes.length % 3 != 0) {

			if(bytes.length % 3 == 2) {

				pos = (byte) ((bytes[i] >> 2) & 63); 
				tmp.append(baseTable.charAt(pos)); 

				pos = (byte) (((bytes[i] & 3) << 4) + ((bytes[i+1] >> 4) & 15)); 
				tmp.append(baseTable.charAt( pos ));
						
				pos = (byte) ((bytes[i+1] & 15) << 2);
				tmp.append(baseTable.charAt(pos));
			
				tmp.append("=");

			} else if(bytes.length % 3 == 1) {
				
				pos = (byte) ((bytes[i] >> 2) & 63); 
				tmp.append(baseTable.charAt(pos)); 

				pos = (byte) ((bytes[i] & 3) << 4); 
				tmp.append(baseTable.charAt( pos ));
						
				tmp.append("==");
			}
		}
		return tmp.toString();

	}

	/**
	 * Encode a String object. 
	 * 
	 * @param src a String object to be encoded with Base64 schema. 
	 * @return encoded String object. 
	 */
	public static String encode(String src) {
		
		return encode(src.getBytes());	
	}

	public static byte[] decode(String src) throws Exception {

		byte[] bytes = null;

		StringBuffer buf = new StringBuffer(src);

		// First, Remove white spaces (\r\n, \t, " ");
		int i = 0;
		char c = ' ';
		char oc = ' ';
		while( i < buf.length()) {			
			oc = c; 
			c = buf.charAt(i);
			if( oc == '\r' && c == '\n') {
				buf.deleteCharAt(i);
				buf.deleteCharAt(i-1);
				i -= 2;
			} else if( c == '\t') {
				buf.deleteCharAt(i);
				i --;
			} else if( c == ' ') {
				i --;
			}
			i++;
		}

		// The source should consists groups with length of 4 chars. 
		if(buf.length() % 4 != 0) {
			throw new Exception("Base64 decoding invalid length");
		}

		// pre-set byte array size.
		bytes = new byte[3 * (buf.length() / 4)];
		//int len = 3 * (buf.length() % 4); 
		//System.out.println("Size of Bytes array: " + len);
		int index = 0;
		
		// Now decode each group
		for(i = 0; i < buf.length(); i+=4) {

			byte data = 0;
			int nGroup = 0;

			for(int j = 0; j < 4; j++) {

				char theChar = buf.charAt(i + j); 

				if(theChar == '=') {
					data = 0;
				} else {
					data = getBaseTableIndex(theChar); 
				}

				if(data == -1) {
					throw new Exception("Base64 decoding bad character");
				}

				nGroup = 64*nGroup + data;
			}

			bytes[index] = (byte) (255 & (nGroup >> 16));
			index ++;

			bytes[index] = (byte) (255 & (nGroup >> 8));
			index ++;

			bytes[index] = (byte) (255 & (nGroup));
			index ++;
		}
		
		byte[] newBytes = new byte[index];
		for(i = 0; i < index; i++) {
			newBytes[i] = bytes[i];
		}

		return newBytes;
	}

	/**
	 * Find index number in base table for a given character. 
	 * 
	 */
	protected static byte getBaseTableIndex(char c) {
		
		byte index = -1;

		for(byte i = 0; i < baseTable.length(); i ++) {
		
			if(baseTable.charAt(i) == c) {
				index = i;
				break;
			}
		}

		return index;
	}
	
	public static void main(String[] args) {
		String encodedString = Base64.encode("Hello PHPRPC".getBytes());
		System.out.println(encodedString);
	}
}

  MD5:

public class MD5 {
	/* 下面这些S11-S44实际上是一个4*4的矩阵，在原始的C实现中是用#define 实现的，
	这里把它们实现成为static final是表示了只读，切能在同一个进程空间内的多个
	Instance间共享*/
	static final int S11 = 7;
	static final int S12 = 12;
	static final int S13 = 17;
	static final int S14 = 22;

	static final int S21 = 5;
	static final int S22 = 9;
	static final int S23 = 14;
	static final int S24 = 20;

	static final int S31 = 4;
	static final int S32 = 11;
	static final int S33 = 16;
	static final int S34 = 23;

	static final int S41 = 6;
	static final int S42 = 10;
	static final int S43 = 15;
	static final int S44 = 21;

	static final byte[] PADDING =
		{
			-128,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0,
			0 };
	/* 下面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现中
	   被定义到MD5_CTX结构中
	
	 */
	private long[] state = new long[4]; // state (ABCD)
	private long[] count = new long[2];
	// number of bits, modulo 2^64 (lsb first)
	private byte[] buffer = new byte[64]; // input buffer

	/* digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的
	　	  16进制ASCII表示.
	*/
	public String digestHexStr;

	/* digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值.
	*/
	private byte[] digest = new byte[16];
	
	/**
	 * 得到MD5加密后的字符串
	 * @param inbuf
	 * @return
	 */
	public String getStrToMD5(String inbuf) {
		md5Init();
		md5Update(inbuf.getBytes(), inbuf.length());
		md5Final();
		digestHexStr = "";
		for (int i = 0; i < 16; i++) {
			digestHexStr += byteHEX(digest[i]);
		}
		return digestHexStr;

	}

	/*
	  getMD5ofStr是类MD5最主要的公共方法，入口参数是你想要进行MD5变换的字符串
	  返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
	*/
	public String getMD5ofStr(String inbuf) {
		md5Init();
		md5Update(inbuf.getBytes(), inbuf.length());
		md5Final();
		digestHexStr = "";
		for (int i = 0; i < 16; i++) {
			digestHexStr += byteHEX(digest[i]);
		}
		digestHexStr=digestHexStr.substring(8,24);
		return digestHexStr;

	}
	// 这是MD5这个类的标准构造函数，JavaBean要求有一个public的并且没有参数的构造函数
	public MD5() {
		md5Init();

		return;
	}

	/* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */
	private void md5Init() {
		count[0] = 0L;
		count[1] = 0L;
		///* Load magic initialization constants.

		state[0] = 0x67452301L;
		state[1] = 0xefcdab89L;
		state[2] = 0x98badcfeL;
		state[3] = 0x10325476L;

		return;
	}
	/* F, G, H ,I 是4个基本的MD5函数，在原始的MD5的C实现中，由于它们是
	简单的位运算，可能出于效率的考虑把它们实现成了宏，在java中，我们把它们
	　　	   实现成了private方法，名字保持了原来C中的。 */

	private long F(long x, long y, long z) {
		return (x & y) | ((~x) & z);

	}
	private long G(long x, long y, long z) {
		return (x & z) | (y & (~z));

	}
	private long H(long x, long y, long z) {
		return x ^ y ^ z;
	}

	private long I(long x, long y, long z) {
		return y ^ (x | (~z));
	}

	/* 
		  FF,GG,HH和II将调用F,G,H,I进行近一步变换
		  FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
		  Rotation is separate from addition to prevent recomputation.
	*/

	private long FF(long a, long b, long c, long d, long x, long s, long ac) {
		a += F(b, c, d) + x + ac;
		a = ((int) a << s) | ((int) a >>> (32 - s));
		a += b;
		return a;
	}

	private long GG(long a, long b, long c, long d, long x, long s, long ac) {
		a += G(b, c, d) + x + ac;
		a = ((int) a << s) | ((int) a >>> (32 - s));
		a += b;
		return a;
	}
	private long HH(long a, long b, long c, long d, long x, long s, long ac) {
		a += H(b, c, d) + x + ac;
		a = ((int) a << s) | ((int) a >>> (32 - s));
		a += b;
		return a;
	}
	private long II(long a, long b, long c, long d, long x, long s, long ac) {
		a += I(b, c, d) + x + ac;
		a = ((int) a << s) | ((int) a >>> (32 - s));
		a += b;
		return a;
	}
	/*
	 md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
	 函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private的
	*/
	private void md5Update(byte[] inbuf, int inputLen) {

		int i, index, partLen;
		byte[] block = new byte[64];
		index = (int) (count[0] >>> 3) & 0x3F;
		// /* Update number of bits */
		if ((count[0] += (inputLen << 3)) < (inputLen << 3))
			count[1]++;
		count[1] += (inputLen >>> 29);

		partLen = 64 - index;

		// Transform as many times as possible.
		if (inputLen >= partLen) {
			md5Memcpy(buffer, inbuf, index, 0, partLen);
			md5Transform(buffer);

			for (i = partLen; i + 63 < inputLen; i += 64) {

				md5Memcpy(block, inbuf, 0, i, 64);
				md5Transform(block);
			}
			index = 0;

		} else
			i = 0;

		///* Buffer remaining input */
		md5Memcpy(buffer, inbuf, index, i, inputLen - i);

	}

	/*
	  md5Final整理和填写输出结果
	*/
	private void md5Final() {
		byte[] bits = new byte[8];
		int index, padLen;

		///* Save number of bits */
		Encode(bits, count, 8);

		///* Pad out to 56 mod 64.
		index = (int) (count[0] >>> 3) & 0x3f;
		padLen = (index < 56) ? (56 - index) : (120 - index);
		md5Update(PADDING, padLen);

		///* Append length (before padding) */
		md5Update(bits, 8);

		///* Store state in digest */
		Encode(digest, state, 16);

	}

	/* md5Memcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的
	　　　　　 字节拷贝到output的outpos位置开始 
	*/

	private void md5Memcpy(
		byte[] output,
		byte[] input,
		int outpos,
		int inpos,
		int len) {
		int i;

		for (i = 0; i < len; i++)
			output[outpos + i] = input[inpos + i];
	}

	/*
	   md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
	*/
	private void md5Transform(byte block[]) {
		long a = state[0], b = state[1], c = state[2], d = state[3];
		long[] x = new long[16];

		Decode(x, block, 64);

		/* Round 1 */
		a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
		d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
		c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
		b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
		a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
		d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
		c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
		b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
		a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
		d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
		c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
		b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
		a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
		d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
		c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
		b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

		/* Round 2 */
		a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
		d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
		c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
		b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
		a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
		d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
		c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
		b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
		a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
		d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
		c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
		b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
		a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
		d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
		c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
		b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

		/* Round 3 */
		a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
		d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
		c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
		b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
		a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
		d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
		c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
		b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
		a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
		d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
		c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
		b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
		a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
		d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
		c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
		b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

		/* Round 4 */
		a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
		d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
		c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
		b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
		a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
		d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
		c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
		b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
		a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
		d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
		c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
		b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
		a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
		d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
		c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
		b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

		state[0] += a;
		state[1] += b;
		state[2] += c;
		state[3] += d;

	}

	/*Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的，
	  只拆低32bit，以适应原始C实现的用途
	*/
	private void Encode(byte[] output, long[] input, int len) {
		int i, j;

		for (i = 0, j = 0; j < len; i++, j += 4) {
			output[j] = (byte) (input[i] & 0xffL);
			output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
			output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
			output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
		}
	}

	/*Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，
	  只合成低32bit，高32bit清零，以适应原始C实现的用途
	*/
	private void Decode(long[] output, byte[] input, int len) {
		int i, j;

		for (i = 0, j = 0; j < len; i++, j += 4)
			output[i] =
				b2iu(input[j])
					| (b2iu(input[j + 1]) << 8)
					| (b2iu(input[j + 2]) << 16)
					| (b2iu(input[j + 3]) << 24);

		return;
	}

	/*
	  b2iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算
	*/
	public static long b2iu(byte b) {
		return b < 0 ? b & 0x7F + 128 : b;
	}

	/*byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
	　	 因为java中的byte的toString无法实现这一点，我们又没有C语言中的
	  sprintf(outbuf,"%02X",ib)
	*/
	public static String byteHEX(byte ib) {
		char[] Digit =
			{
				'0',
				'1',
				'2',
				'3',
				'4',
				'5',
				'6',
				'7',
				'8',
				'9',
				'a',
				'b',
				'c',
				'd',
				'e',
				'f' };
		char[] ob = new char[2];
		ob[0] = Digit[(ib >>> 4) & 0X0F];
		ob[1] = Digit[ib & 0X0F];
		String s = new String(ob);
		return s;
	}

	public static void main(String args[]) {

		MD5 m = new MD5();
		String abc = m.getMD5ofStr("123456");
		System.out.println(abc);
	}

}

  复杂加密：

    public static String Encrypt(String str) {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
        String strOut = "";
        try {
            // DES算法要求有一个可信任的随机数源
            SecureRandom sr = new SecureRandom();

            // 从原始密匙数据创建DESKeySpec对象
            DESKeySpec dks = new DESKeySpec(KEY_STRING.getBytes());

            // 创建一个密匙工厂，然后用它把DESKeySpec转换成
            // 一个SecretKey对象
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(dks);

            // Cipher对象实际完成加密操作
            Cipher cipher = Cipher.getInstance("DES");

            // 用密匙初始化Cipher对象
            cipher.init(Cipher.ENCRYPT_MODE, key, sr);

            // 现在，获取数据并加密
            byte data[] = str.getBytes(); /* 用某种方法获取数据 */

            // 正式执行加密操作
            byte encryptedData[] = cipher.doFinal(data);

            strOut = encoder.encode(encryptedData);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strOut;
    }

    public static String Decrypt(String s) {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        String strOut = "";
        sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
        try {
            // DES算法要求有一个可信任的随机数源
            SecureRandom sr = new SecureRandom();

            // 从原始密匙数据创建一个DESKeySpec对象
            DESKeySpec dks = new DESKeySpec(KEY_STRING.getBytes());

            // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
            // 一个SecretKey对象
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            
            SecretKey key = keyFactory.generateSecret(dks);

            // Cipher对象实际完成解密操作
            Cipher cipher = Cipher.getInstance("DES");

            // 用密匙初始化Cipher对象
            cipher.init(Cipher.DECRYPT_MODE, key, sr);

            // 现在，获取数据并解密
            byte encryptedData[] = decoder.decodeBuffer(s); /* 获得经过加密的数据 */

            // 正式执行解密操作
            byte decryptedData[] = cipher.doFinal(encryptedData);

            strOut = new String(decryptedData);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strOut;
    }
    
    public static void main(String[] args){
    	String a=Encrypt("aaa");
    	
    	System.out.print(a);
    	
    	String b=Decrypt("5991bf21cbe98232".toUpperCase());
    	
    	System.out.print(b);
    }