3des加密算法的Java实现

import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class CipherTest {public static void main(String[] args) {try {byte[] keydata = { (byte) 0x00, (byte) 0x01, (byte) 0x02,(byte) 0x03, (byte) 0x04, (byte) 0x05, (byte) 0x06,(byte) 0x07, (byte) 0x08, (byte) 0x09, (byte) 0x0a,(byte) 0x0b, (byte) 0x0c, (byte) 0x0d, (byte) 0x0e,(byte) 0x0f, (byte) 0x10, (byte) 0x11, (byte) 0x12,(byte) 0x13, (byte) 0x14, (byte) 0x15, (byte) 0x16,(byte) 0x17, };String algorithm = "DESede";String clearTextString = "I wanna be with you.";String encoding = "US-ASCII";// javax.crypto.spec.DESedeKeySpecSecretKey key = new SecretKeySpec(keydata, algorithm);Cipher cipher = Cipher.getInstance(algorithm);byte[] clearText = clearTextString.getBytes(encoding);cipher.init(Cipher.ENCRYPT_MODE, key);byte[] encryptedText = cipher.doFinal(clearText);cipher.init(Cipher.DECRYPT_MODE, key);byte[] decryptedText = cipher.doFinal(encryptedText);System.out.println("********************************************");System.out.println(new String(clearText, encoding));System.out.println(bytesToString(clearText));System.out.println("********************************************");System.out.println(new String(encryptedText, encoding));System.out.println(bytesToString(encryptedText));System.out.println("********************************************");System.out.println(new String(decryptedText, encoding));System.out.println(bytesToString(decryptedText));System.out.println("********************************************");} catch (Exception e) {e.printStackTrace();}}private static String bytesToString(byte[] b) {if (b == null)return null;StringBuffer sb = null;sb = new StringBuffer();for (int i = 0; i < b.length; i++) {sb.append(Integer.toString((int) ((b[i] >> 4) & 0x0F), 16));sb.append(Integer.toString((int) (b[i] & 0x0F), 16));}return sb.toString().toUpperCase();}}