AES加密

Posted 2020-09-27 新宇泽起

import javax.crypto.*;
import javax.crypto.spec.*;
public class AES {
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 = "1234567890abcDEF";
//需要加密的字串
String cSrc = "我的MSN：[email protected]，QQ：68524621"
;
//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");
}
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");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
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;
}
}
//判断Key是否正确
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("ASCII");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(sSrc.getBytes());
return byte2hex(encrypted).toLowerCase();
}
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[n] & 0XFF));
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs.toUpperCase();
}
}


以上代码执行结果
加密后的字串是：e965a929ae598b701bc2bc4714164c27524aab4769f269c434c55b61e398600175a38e0a4794cdef9c0463a182d2cde3
加密耗时：672毫秒
解密后的字串是：我的MSN：[email protected]，QQ：68524621
解密耗时：0毫秒