简单的RSA和AES加密算法的java实现

AES如下：

package com.timliu.security.symmetric_encryption;

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 AESTest 
{
 public static final String src = "aes test";
 public static void main(String[] args) 
 {
  jdkAES();
  bcAES();

 }
 
 // 用jdk实现:
 public static void jdkAES()
 {
  try 
  {
   // 生成KEY
   KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");   
   keyGenerator.init(128);
   // 产生密钥
   SecretKey secretKey = keyGenerator.generateKey();
   // 获取密钥
   byte[] keyBytes = secretKey.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(src.getBytes());
   System.out.println("jdk aes encrypt:" + Hex.encodeHexString(result));
   
   // 解密
   cipher.init(Cipher.DECRYPT_MODE, key);
   result = cipher.doFinal(result);
   System.out.println("jdk aes decrypt:" + new String(result));
   
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 // 用bouncy castle实现:
 public static void bcAES()
 {
  try 
  {
   Security.addProvider(new BouncyCastleProvider());
   
   // 生成KEY
   KeyGenerator keyGenerator = KeyGenerator.getInstance("AES", "BC"); 
   keyGenerator.getProvider();
   keyGenerator.init(128);
   // 产生密钥
   SecretKey secretKey = keyGenerator.generateKey();
   // 获取密钥
   byte[] keyBytes = secretKey.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(src.getBytes());
   System.out.println("bc aes encrypt:" + Hex.encodeHexString(result));
   
   // 解密
   cipher.init(Cipher.DECRYPT_MODE, key);
   result = cipher.doFinal(result);
   System.out.println("bc aes decrypt:" + new String(result));
   
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}

RSA:

package com.timliu.security.asymmetric_encryption;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;
import javax.crypto.KeyAgreement;
import javax.crypto.SecretKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;

import org.apache.commons.codec.binary.Base64;

import com.sun.org.apache.xalan.internal.utils.Objects;

public class RSATest 
{
 public static final String src = "rsa test";

 public static void main(String[] args) 
 {
  jdkRSA();

 }
 
 // jdk实现：
 public static void jdkRSA()
 {  
  try 
  {
   // 1.初始化发送方密钥
   KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
   keyPairGenerator.initialize(512);
   KeyPair keyPair = keyPairGenerator.generateKeyPair();
   RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
   RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
   System.out.println("Public Key:" + Base64.encodeBase64String(rsaPublicKey.getEncoded()));
   System.out.println("Private Key:" + Base64.encodeBase64String(rsaPrivateKey.getEncoded()));
   
   // 2.私钥加密、公钥解密 ---- 加密
   PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
   KeyFactory keyFactory = KeyFactory.getInstance("RSA");
   PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
   Cipher cipher = Cipher.getInstance("RSA");
   cipher.init(Cipher.ENCRYPT_MODE, privateKey);
   byte[] result = cipher.doFinal(src.getBytes());
   System.out.println("私钥加密、公钥解密 ---- 加密:" + Base64.encodeBase64String(result));
   
   // 3.私钥加密、公钥解密 ---- 解密
   X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
   keyFactory = KeyFactory.getInstance("RSA");
   PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
   cipher = Cipher.getInstance("RSA");
   cipher.init(Cipher.DECRYPT_MODE, publicKey);
   result = cipher.doFinal(result);
   System.out.println("私钥加密、公钥解密 ---- 解密:" + new String(result));
   
   
   
   // 4.公钥加密、私钥解密 ---- 加密
   X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
   KeyFactory keyFactory2 = KeyFactory.getInstance("RSA");
   PublicKey publicKey2 = keyFactory2.generatePublic(x509EncodedKeySpec2);
   Cipher cipher2 = Cipher.getInstance("RSA");
   cipher2.init(Cipher.ENCRYPT_MODE, publicKey2);
   byte[] result2 = cipher2.doFinal(src.getBytes());
   System.out.println("公钥加密、私钥解密 ---- 加密:" + Base64.encodeBase64String(result2));
   
   // 5.私钥解密、公钥加密 ---- 解密
   PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
   KeyFactory keyFactory5 = KeyFactory.getInstance("RSA");
   PrivateKey privateKey5 = keyFactory5.generatePrivate(pkcs8EncodedKeySpec5);
   Cipher cipher5 = Cipher.getInstance("RSA");
   cipher5.init(Cipher.DECRYPT_MODE, privateKey5);
   byte[] result5 = cipher5.doFinal(result2);
   System.out.println("公钥加密、私钥解密 ---- 解密:" + new String(result5));
   
  } catch (Exception e) {
   
   e.printStackTrace();
  }
  
 }

}

简单的RSA和AES加密算法的java实现

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