AES 加密解密的 JAVA 实现 【二】

使用环境 JDK1.8

这种方法 密钥可以不是16位，偏移量是16位。

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
* <b>AES 加密/解密[一种128位密钥补位的方式]</b><br>
* 调用方法参见main方法，事先可以指定自己的 iv和key参数<br>
* 注意：这是AES 的 一种，其中公开密钥16位，密钥可以不是16位；偏移量16位，否则会报错；<br>
* 另外，本方法发的实际密钥按照128位随机填充的方式，也有其他的实现方式，会产生不同的密文，需要注意。<br>
*
*
*/
public class AES {

public static String key = "ThisIsMyTestKey12345";
public static String iv = "1234567890123456";

/**
* 偏移量获取
* @return
* @throws UnsupportedEncodingException
*/
private static IvParameterSpec getIV() throws UnsupportedEncodingException {
return new IvParameterSpec(iv.getBytes("UTF-8"));
}

/**
* 密钥生成
* @return
* @throws UnsupportedEncodingException
* @throws NoSuchAlgorithmException
*/
public static SecretKeySpec getKey() throws UnsupportedEncodingException, NoSuchAlgorithmException {
Security.addProvider(new BouncyCastleProvider());
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(key.getBytes()));
SecretKey keygen = kgen.generateKey();
SecretKeySpec keySpec = new SecretKeySpec(keygen.getEncoded(), "AES");
return keySpec;
}

/**
* 解密
*
* @param content
* @return
*/
public static String decrypt(String content) {
try {

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, getKey(), getIV());
byte[] decodedContent = new BASE64Decoder().decodeBuffer(content);
byte[] original = cipher.doFinal(decodedContent);
return new String(original);
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
;

return null;
}

/**
* 加密
*
* @param content
* @return
*/
public static String encrypt(String content) {

try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, getKey(), getIV());
byte[] contentByte = content.getBytes("UTF-8");
byte[] result = cipher.doFinal(contentByte);
return new BASE64Encoder().encode(result);
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
};

return null;
}

/**
* 调用的测试主方法
* @param args
* @throws UnsupportedEncodingException
*/
public static void main(String[] args) throws UnsupportedEncodingException {
String content = "欲穷千里目，更上一层楼";
AES.key +="ThisIsMyTestKey12345ThisIsMyTestKey12345ThisIsMyTestKey12345ThisIsMyTestKey12345ThisIsMyTestKey12345ThisIsMyTestKey12345";
// 加密
System.out.println("加密前：" + content);
String resultString = AES.encrypt(content);
System.out.println("加密后：" + resultString);
// 解密
String decryptResult = AES.decrypt(resultString);
System.out.println("解密后：" + decryptResult);

}

}