JAVA实现AES的加密和解密算法
JAVA实现AES的加密和解密算法 加密模式为 AES-128-CBC
1 import javax.crypto.Cipher; 2 import javax.crypto.spec.IvParameterSpec; 3 import javax.crypto.spec.SecretKeySpec; 4 5 import sun.misc.BASE64Decoder; 6 import sun.misc.BASE64Encoder; 7 8 /**AES 是一种可逆加密算法，对用户的敏感信息加密处理 9 * 对原始数据进行AES加密后，在进行Base64编码转化； 10 */ 11 public class AESOperator { 12 /* 13 * 加密用的Key 可以用26个字母和数字组成 14 * 此处使用AES-128-CBC加密模式，key需要为16位。 15 */ 16 private String sKey=”0123456789abcdef”; 17 private String ivParameter=”0123456789abcdef”; 18 private static AESOperator instance=null; 19 private AESOperator(){ 20 21 } 22 public static AESOperator getInstance(){ 23 if (instance==null) 24 instance= new AESOperator(); 25 return instance; 26 } 27 // 加密 28 public String encrypt(String sSrc) throws Exception { 29 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”); 30 byte[] raw = sKey.getBytes(); 31 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”); 32 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度 33 cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv); 34 byte[] encrypted = cipher.doFinal(sSrc.getBytes(“utf-8″)); 35 return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。 36 } 37 38 // 解密 39 public String decrypt(String sSrc) throws Exception { 40 try { 41 byte[] raw = sKey.getBytes(“ASCII”); 42 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”); 43 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”); 44 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes()); 45 cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv); 46 byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密 47 byte[] original = cipher.doFinal(encrypted1); 48 String originalString = new String(original,”utf-8″); 49 return originalString; 50 } catch (Exception ex) { 51 return null; 52 } 53 } 54 55 public static void main(String[] args) throws Exception { 56 // 需要加密的字串 57 String cSrc = “我来自www.xxxx.com”; 58 System.out.println(cSrc); 59 // 加密 60 long lStart = System.currentTimeMillis(); 61 String enString = AESOperator.getInstance().encrypt(cSrc); 62 System.out.println(“加密后的字串是：” + enString); 63 64 long lUseTime = System.currentTimeMillis() – lStart; 65 System.out.println(“加密耗时：” + lUseTime + “毫秒”); 66 // 解密 67 lStart = System.currentTimeMillis(); 68 String DeString = AESOperator.getInstance().decrypt(enString); 69 System.out.println(“解密后的字串是：” + DeString); 70 lUseTime = System.currentTimeMillis() – lStart; 71 System.out.println(“解密耗时：” + lUseTime + “毫秒”); 72 } 73 }
