每日一得--对称加密算法之（AES）

本文链接：https://blog.youkuaiyun.com/xoopx/article/details/44225165

本文提供了一个使用Java实现AES加密解密的具体示例，包括通过JDK和BouncyCastle两种方式生成密钥、进行加密及解密的过程，并展示了如何使用Hex编码显示加密后的字符串。

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一，实现对称加密算法的方式：jdk实现方式和bcprov-jdk15-133.jar（简称bc）实现方式

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class AESMain {
private static String str = "husq AES test";
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
jdkAES();
bcAES();
}

public static void jdkAES(){

try{
//生成key
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey securetkey = keyGenerator.generateKey();
byte[] keyBytes = securetkey.getEncoded();

//key转换
Key key = new SecretKeySpec(keyBytes,"AES");

//加密
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(str.getBytes());

System.out.println("jdk AES encrypt="+Hex.encodeHexString(result));

//解密
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] dsign = cipher.doFinal(result);
System.out.println("jdk AES dncrypt="+new String(dsign));

System.out.println("==========================================");
}catch(Exception e){
e.printStackTrace();
}

}

public static void bcAES(){

try{
Security.addProvider(new BouncyCastleProvider());

//生成key
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES","BC");
keyGenerator.getProvider();
keyGenerator.init(128);
SecretKey securetkey = keyGenerator.generateKey();
byte[] keyBytes = securetkey.getEncoded();

//key转换
Key key = new SecretKeySpec(keyBytes,"AES");

//加密
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(str.getBytes());

System.out.println("bc AES encrypt="+Hex.encodeHexString(result));

//解密
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] dsign = cipher.doFinal(result);
System.out.println("bc AES dncrypt="+new String(dsign));

}catch(Exception e){
e.printStackTrace();
}
}
}