对称加密算法3DES

package com.imooc.security.des; import java.security.Key; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import org.apache.commons.codec.binary.Hex; /** * 对称加密算法 * @author Bingo_Ge * */ public class Imooc3DES { private static String src = "imooc security 3des"; public static void main(String[] args) { jdk3DES(); } private static void jdk3DES() { try { //1.生成KEY-byte KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede"); //固定写法 keyGenerator.init(168); // 初始化KEY长度 SecretKey secretKey = keyGenerator.generateKey(); byte[] bytesKey = secretKey.getEncoded(); // 2.KEY转换 DESedeKeySpec desKeySpec = new DESedeKeySpec(bytesKey);//放入按指定加密方式生成key的byte数组 SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");//固定写法 Key converSecretKey = factory.generateSecret(desKeySpec); // 生成转换后的密钥 // 加密 Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding"); //生成加密类（固定写法） cipher.init(cipher.ENCRYPT_MODE, converSecretKey); //填入加解密模式和密钥 byte[] result = cipher.doFinal(src.getBytes()); //得到加密后结果数组 System.out.println("jdk 3des encrypt:" + Hex.encodeHexString(result)); //解密 cipher.init(cipher.DECRYPT_MODE, converSecretKey); //此处为解密模式，还是需要用到原来的key result = cipher.doFinal(result); //得到解密后结果数组 System.out.println("jdk 3des decrypt:" + new String(result)); } catch (Exception e) { e.printStackTrace(); } } // 使用自己定义的密钥加密 public static String encryptThreeDESECB(String src, String key) throws Exception{ try { if(src == null) { return null; } DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("utf-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede"); SecretKey secureKey = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance("DESede/ECB/PKCSSPadding"); cipher.init(Cipher.ENCRYPT_MODE, securekey); byte[] b = cipher.doFinal(src.getBytes()); BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(b).replaceAll("\r", "").replaceAll("\n", ""); } catch (Exception e) { throw new Exception(e); } } // 使用自己定义的密钥解密 public static String decryptThreeDESECB(String src, String key) throws Exception { try { if(src == null) { return null; } // 通过base64，将字符串转成byte数组 BASE64Decoder decoder = new BASE64Decoder(); byte[] bytesrc = decoder.decodeBuffer(src); // 加密的key DESedKeySpec dks = newDESedeKeySpec(key.getBytes("utf-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede"); SecretKey securekey = keyFactory.generateSecret(dks); // /chipher对象解密 Cipher cipher = Cipher.getInstance("DESede/ECB/PKCSSPadding"); cipher.init(Cipher.DECRYPT_MODE, securekey); byte[] retByte = cipher.doFinal(bytesrc); return new String(retByte); } catch (Exception e) { throw new Eception(e); } } }