【java】AES加密解密|及Base64的使用

package com.common;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

//AES加解密算法，使用Base64做转码以及辅助加密：

public class AES {

// 加密

public static String Encrypt(String sSrc, String sKey) throws Exception {

if (sKey == null) {

System.out.print("Key为空null");

return null;

}

// 判断Key是否为16位

if (sKey.length() != 16) {

System.out.print("Key长度不是16位");

return null;

}

byte[] raw = sKey.getBytes();

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");//"算法/模式/补码方式"

IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度

cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

byte[] encrypted = cipher.doFinal(sSrc.getBytes());

return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。

}

// 解密

public static String Decrypt(String sSrc, String sKey) throws Exception {

try {

// 判断Key是否正确

if (sKey == null) {

System.out.print("Key为空null");

return null;

}

// 判断Key是否为16位

if (sKey.length() != 16) {

System.out.print("Key长度不是16位");

return null;

}

byte[] raw = sKey.getBytes("ASCII");

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

IvParameterSpec iv = new IvParameterSpec("0102030405060708"

.getBytes());

cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密

try {

byte[] original = cipher.doFinal(encrypted1);

String originalString = new String(original);

return originalString;

} catch (Exception e) {

System.out.println(e.toString());

return null;

}

} catch (Exception ex) {

System.out.println(ex.toString());

return null;

}

}

public static void main(String[] args) throws Exception {

/*

* 加密用的Key 可以用26个字母和数字组成，最好不要用保留字符，虽然不会错，至于怎么裁决，个人看情况而定

* 此处使用AES-128-CBC加密模式，key需要为16位。

*/

String cKey = "1234567890123456";

// 需要加密的字串

String cSrc = "Email : arix04@xxx.com";

System.out.println(cSrc);

// 加密

long lStart = System.currentTimeMillis();

String enString = AES.Encrypt(cSrc, cKey);

System.out.println("加密后的字串是：" + enString);

long lUseTime = System.currentTimeMillis() - lStart;

System.out.println("加密耗时：" + lUseTime + "毫秒");

// 解密

lStart = System.currentTimeMillis();

String DeString = AES.Decrypt(enString, cKey);

System.out.println("解密后的字串是：" + DeString);

lUseTime = System.currentTimeMillis() - lStart;

System.out.println("解密耗时：" + lUseTime + "毫秒");

}

}

---------------------------------

package com.common;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

//AES加解密算法，使用byte2hex做转码：

public class AES2 {

// 加密

public static String Encrypt(String sSrc, String sKey) throws Exception {

if (sKey == null) {

System.out.print("Key为空null");

return null;

}

// 判断Key是否为16位

if (sKey.length() != 16) {

System.out.print("Key长度不是16位");

return null;

}

byte[] raw = sKey.getBytes();

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());

cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

byte[] encrypted = cipher.doFinal(sSrc.getBytes());

return byte2hex(encrypted).toLowerCase();

}

// 解密

public static String Decrypt(String sSrc, String sKey) throws Exception {

try {

// 判断Key是否正确

if (sKey == null) {

System.out.print("Key为空null");

return null;

}

// 判断Key是否为16位

if (sKey.length() != 16) {

System.out.print("Key长度不是16位");

return null;

}

byte[] raw = sKey.getBytes("ASCII");

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

IvParameterSpec iv = new IvParameterSpec("0102030405060708"

.getBytes());

cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

byte[] encrypted1 = hex2byte(sSrc);

try {

byte[] original = cipher.doFinal(encrypted1);

String originalString = new String(original);

return originalString;

} catch (Exception e) {

System.out.println(e.toString());

return null;

}

} catch (Exception ex) {

System.out.println(ex.toString());

return null;

}

}

public static byte[] hex2byte(String strhex) {

if (strhex == null) {

return null;

}

int l = strhex.length();

if (l % 2 == 1) {

return null;

}

byte[] b = new byte[l / 2];

for (int i = 0; i != l / 2; i++) {

b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),

16);

}

return b;

}

public static String byte2hex(byte[] b) {

String hs = "";

String stmp = "";

for (int n = 0; n < b.length; n++) {

stmp = (java.lang.Integer.toHexString(b
& 0XFF));

if (stmp.length() == 1) {

hs = hs + "0" + stmp;

} else {

hs = hs + stmp;

}

}

return hs.toUpperCase();

}

public static void main(String[] args) throws Exception {

/*

* 加密用的Key 可以用26个字母和数字组成，最好不要用保留字符，虽然不会错，至于怎么裁决，个人看情况而定

*/

String cKey = "1234567890123456";

// 需要加密的字串

String cSrc = "Email : arix04@xxx.com";

System.out.println(cSrc);

// 加密

long lStart = System.currentTimeMillis();

String enString = AES.Encrypt(cSrc, cKey);

System.out.println("加密后的字串是：" + enString);

long lUseTime = System.currentTimeMillis() - lStart;

System.out.println("加密耗时：" + lUseTime + "毫秒");

// 解密

lStart = System.currentTimeMillis();

String DeString = AES.Decrypt(enString, cKey);

System.out.println("解密后的字串是：" + DeString);

lUseTime = System.currentTimeMillis() - lStart;

System.out.println("解密耗时：" + lUseTime + "毫秒");

}

}