RSA加密的方式和解密方式实现方法(推荐)

RSAsecurity.java

package com.mstf.rsa;
 
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 com.sun.org.apache.xerces.internal.impl.dv.util.base64;
 

public class RSAsecurity {
 
 public static String src = "admin";
 
 public void priENpubDE() {
 
  try {
   // 初始化秘钥
   KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
   // 秘钥长度
   keyPairGenerator.initialize(1024);
   // 初始化秘钥对
   KeyPair keyPair = keyPairGenerator.generateKeyPair();
   // 公钥
   RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
   // 私钥
   RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
 
   // 2.私钥加密，公钥解密----加密
   // 生成私钥
   PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
   KeyFactory keyFactory = KeyFactory.getInstance("RSA");
   PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
   // Cipher类为加密和解密提供密码功能，通过getinstance实例化对象
   Cipher cipher = Cipher.getInstance("RSA");
   // 初始化加密
   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.encode(result));
 
   // 3.私钥加密，公钥解密----解密
   // 生成公钥
   X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
   keyFactory = KeyFactory.getInstance("RSA");
   PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
   cipher = Cipher.getInstance("RSA");
   // 初始化解密
   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));
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 
 }
 
 public void pubENpriDE() {
  try {
   // 1.初始化秘钥
   KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
   // 秘钥长度
   keyPairGenerator.initialize(512);
   // 初始化秘钥对
   KeyPair keyPair = keyPairGenerator.generateKeyPair();
   // 公钥
   RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
   // 私钥
   RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
 
   // 2.公钥加密，私钥解密----加密
   X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
   KeyFactory keyFactory = KeyFactory.getInstance("RSA");
   PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
   // 初始化加密
   // Cipher类为加密和解密提供密码功能，通过getinstance实例化对象
   Cipher cipher = Cipher.getInstance("RSA");
   cipher.init(Cipher.ENCRYPT_MODE, publicKey);
   // 加密字符串
   byte[] result = cipher.doFinal(src.getBytes());
   System.out.println("公钥加密，私钥解密----加密:" + base64.encode(result));
 
   // 3.公钥加密，私钥解密-----解密
   PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
   keyFactory = KeyFactory.getInstance("RSA");
   PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
   // 初始化解密
   cipher.init(Cipher.DECRYPT_MODE, privateKey);
   // 解密字符串
   result = cipher.doFinal(result);
   System.out.println("公钥加密，私钥解密-----解密:" + new String(result));
 
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 
 }
}

RSAtest.java

package com.mstf.rsa;
 
import com.mstf.rsa.RSAsecurity;
 
public class RSAtest {
 public static void main(String[] args) {
  RSAsecurity rsAsecurity = new RSAsecurity();
  System.out.println("私钥加密公钥解密例：");
  rsAsecurity.priENpubDE();
  System.out.println("公钥加密私钥解密例：");
  rsAsecurity.pubENpriDE();
 }
}

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