JDK中对称加密DES

数据加密算法（Data Encryption Algorithm，DEA）是一种对称加密算法，很可能是使用最广泛的密钥系统，特别是在保护金融数据的安全中，最初开发的DEA是嵌入硬件中的。通常，自动取款机（Automated Teller Machine，ATM）都使用DEA。它出自IBM的研究工作，IBM也曾对它拥有几年的专利权，但是在1983年已到期后，处于公有范围中，允许在特定条件下可以免除专利使用费而使用。1997年被美国政府正式采纳

demo如下：

package com.zhangfx.jiami.des;import java.security.Key;import java.security.NoSuchAlgorithmException;import java.security.Security;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.bouncycastle.jce.provider.BouncyCastleProvider;/** * 密钥长度为56位和64位 * 1998年后不断被破解，不再使用 * @author ambitious * */public class AmbitiousDES {private static String str ="ambitious security des";public static void main(String[] args){jdkDES();bcDES();}public static void jdkDES(){try {//生成keyKeyGenerator keyGenerator = KeyGenerator.getInstance("DES");keyGenerator.init(56);SecretKey  secretKey = keyGenerator.generateKey();byte[] byteKey =  secretKey.getEncoded();//key的转换DESKeySpec dESKeySpec = new DESKeySpec(byteKey);SecretKeyFactory factory =  SecretKeyFactory.getInstance("DES");//制定加密方式Key convertsecretKey =  factory.generateSecret(dESKeySpec);//加密Cipher  cipher  = Cipher.getInstance("DES/ECB/PKCS5Padding");//  加解密的算法/工作方式/填充方式cipher.init(Cipher.ENCRYPT_MODE, convertsecretKey);byte[] result = cipher.doFinal(str.getBytes());System.out.println("jdk dsc 16进制的结果 encrypt:"+CHexConver.byte2HexStr(result));//解密cipher.init(Cipher.DECRYPT_MODE, convertsecretKey);result = cipher.doFinal(result);System.out.println("jdk dsc decrypt:"+new String(result));} catch (Exception e) {e.printStackTrace();}}public static void bcDES(){try {Security.addProvider(new BouncyCastleProvider());//生成keyKeyGenerator keyGenerator = KeyGenerator.getInstance("DES","BC");keyGenerator.init(56);keyGenerator.getProvider();SecretKey  secretKey = keyGenerator.generateKey();byte[] byteKey =  secretKey.getEncoded();//key的转换DESKeySpec dESKeySpec = new DESKeySpec(byteKey);SecretKeyFactory factory =  SecretKeyFactory.getInstance("DES");//制定加密方式Key convertsecretKey =  factory.generateSecret(dESKeySpec);//加密Cipher  cipher  = Cipher.getInstance("DES/ECB/PKCS5Padding");//  加解密的算法/工作方式/填充方式cipher.init(Cipher.ENCRYPT_MODE, convertsecretKey);byte[] result = cipher.doFinal(str.getBytes());System.out.println("jdk dsc 16进制的结果 encrypt:"+CHexConver.byte2HexStr(result));//解密cipher.init(Cipher.DECRYPT_MODE, convertsecretKey);result = cipher.doFinal(result);System.out.println("jdk dsc decrypt:"+new String(result));} catch (Exception e) {e.printStackTrace();}}}