这个算法简单,而且效率高,每次可以操作8个字节的数据,加密解密的KEY为16字节,即包含4个int数据的int型数组,加密轮数应为8的倍数,一般比较常用的轮数为64,32,16,推荐用64轮.源代码如下:/** *//*** Tea算法* 每次操作可以处理8个字节数据* KEY为16字节,应为包含4个int型数的int[],一个int为4个字节* 加密解密轮数应为8的倍数,推荐加密轮数为64轮* */public class Tea { //加密public byte[] encrypt(byte[] content, int offset, int[] key, int times){//times为加密轮数int[] tempInt = byteToInt(content, offset);int y = tempInt[0], z = tempInt[1], sum = 0, i;int delta=0x9e3779b9; //这是算法标准给的值int a = key[0], b = key[1], c = key[2], d = key[3];for (i = 0; i < times; i++) { sum += delta;y += ((z<<4) + a) ^ (z + sum) ^ ((z>>5) + b);z += ((y<<4) + c) ^ (y + sum) ^ ((y>>5) + d);}tempInt[0]=y;tempInt[1]=z;return intToByte(tempInt, 0);}//解密public byte[] decrypt(byte[] encryptContent, int offset, int[] key, int times){ int[] tempInt = byteToInt(encryptContent, offset);int y = tempInt[0], z = tempInt[1], sum = 0xC6EF3720, i;int delta=0x9e3779b9; //这是算法标准给的值int a = key[0], b = key[1], c = key[2], d = key[3];for(i = 0; i < times; i++) { z -= ((y<<4) + c) ^ (y + sum) ^ ((y>>5) + d);y -= ((z<<4) + a) ^ (z + sum) ^ ((z>>5) + b);sum -= delta;}tempInt[0] = y;tempInt[1] = z;return intToByte(tempInt, 0);}//byte[]型数据转成int[]型数据private int[] byteToInt(byte[] content, int offset){ int[] result = new int[content.length >> 2]; //除以2的n次方 == 右移n位 即 content.length / 4 == content.length >> 2for(int i = 0, j = offset; j < content.length; i++, j += 4){ result[i] = transform(content[j + 3]) | transform(content[j + 2]) << 8 |transform(content[j + 1]) << 16 | (int)content[j] << 24;}return result;}//int[]型数据转成byte[]型数据private byte[] intToByte(int[] content, int offset){ byte[] result = new byte[content.length << 2]; //乘以2的n次方 == 左移n位 即 content.length * 4 == content.length << 2for(int i = 0, j = offset; j < result.length; i++, j += 4){ result[j + 3] = (byte)(content[i] & 0xff);result[j + 2] = (byte)((content[i] >> 8) & 0xff);result[j + 1] = (byte)((content[i] >> 16) & 0xff);result[j] = (byte)((content[i] >> 24) & 0xff);}return result;}//若某字节被解释成负的则需将其转成无符号正数private static int transform(byte temp){ int tempInt = (int)temp;if(tempInt < 0){ tempInt += 256;}return tempInt;}}测试代码如下:public static void main(String[] args){ int[] KEY = new int[]{//加密解密所用的KEY0x789f5645, 0xf68bd5a4,0x81963ffa, 0x458fac58};Tea tea = new Tea();byte[] info = new byte[]{ 1,2,3,4,5,6,7,8};System.out.print("原数据:");for(byte i : info)System.out.print(i + " ");System.out.println();byte[] secretInfo = tea.encrypt(info, 0, KEY, 32);System.out.print("加密后的数据:");for(byte i : secretInfo)System.out.print(i + " ");System.out.println();byte[] decryptInfo = tea.decrypt(secretInfo, 0, KEY, 32);System.out.print("解密后的数据:");for(byte i : decryptInfo)System.out.print(i + " ");}输出结果如下:原数据:1 2 3 4 5 6 7 8加密后的数据:92 124 -3 -125 -115 82 21 28解密后的数据:1 2 3 4 5 6 7 8这只是一次加密解密操作,如果你想一次处理大于8个字节的数据,需要再封装一下.封装后的代码如下://通过TEA算法加密信息private byte[] encryptByTea(String info){ byte[] temp = info.getBytes();int n = 8 - temp.length % 8; //若temp的位数不足8的倍数,需要填充的位数byte[] encryptStr = new byte[temp.length + n];encryptStr[0] = (byte)n;System.arraycopy(temp, 0, encryptStr, n, temp.length);byte[] result = new byte[encryptStr.length];for(int offset = 0; offset < result.length; offset += 8){ byte[] tempEncrpt = tea.encrypt(encryptStr, offset, KEY, 32);System.arraycopy(tempEncrpt, 0, result, offset, 8);}return result;}//通过TEA算法解密信息private String decryptByTea(byte[] secretInfo){ byte[] decryptStr = null;byte[] tempDecrypt = new byte[secretInfo.length];for(int offset = 0; offset < secretInfo.length; offset += 8){ decryptStr = tea.decrypt(secretInfo, offset, KEY, 32);System.arraycopy(decryptStr, 0, tempDecrypt, offset, 8);}int n = tempDecrypt[0];return new String(tempDecrypt, n, decryptStr.length - n);}测试代码如下:public static void main(String[] args){ String info = "www.blogjava.net/orangehf";System.out.println("原数据:" + info);SaveFileIO io = new SaveFileIO();byte[] encryptInfo = io.encryptByTea(info);System.out.print("加密后的数据:");for(byte i : encryptInfo)System.out.print(i + " ");System.out.println();String decryptInfo = io.decryptByTea(encryptInfo);System.out.print("解密后的数据:");System.out.println(decryptInfo);}输出结果如下:原数据:www.blogjava.net/orangehf加密后的数据:-123 7 -64 -33 -29 32 107 -17 89 78 -78 -11 -125 -12 -59 -2 49 -112 -122 -91 -102 118 114 -11 -24 39 113 -14 66 37 -2 114解密后的数据:www.blogjava.net/orangehf