AES 加密解密的 JAVA 实现 【二】

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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);

	}

}