如何在java中实现RSA非对称加密算法

这期内容当中小编将会给大家带来有关如何在java中实现RSA非对称加密算法，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

初始化密钥：

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
      keyPairGenerator.initialize(512);
      KeyPair keyPair = keyPairGenerator.generateKeyPair();
      RSAPrivateKey rsaprivateKey = (RSAPrivateKey)keyPair.getPrivate();//私有密钥
      RSAPublicKey rsapublicKey = (RSAPublicKey)keyPair.getPublic();//公有密钥
      System.out.println("privateKey : "+Base64.encodeBase64String(rsaprivateKey.getEncoded()));
      System.out.println("publicKey : "+Base64.encodeBase64String(rsapublicKey.getEncoded()));

1、私钥加密，公钥解密：

//私钥加密，公钥解密--加密
      PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaprivateKey.getEncoded());
      KeyFactory privateKeyFactory = KeyFactory.getInstance("RSA");
      PrivateKey privateKey = privateKeyFactory.generatePrivate(pkcs8EncodedKeySpec);
      Cipher privateCipher = Cipher.getInstance("RSA");
      privateCipher.init(Cipher.ENCRYPT_MODE, privateKey);
      byte[] result = privateCipher.doFinal(src.getBytes());
      System.out.println("私钥加密，公钥解密--加密:"+Base64.encodeBase64String(result));
      
      //私钥加密，公钥解密--解密
      X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsapublicKey.getEncoded());
      KeyFactory publicKeyFactory = KeyFactory.getInstance("RSA");
      PublicKey publicKey = publicKeyFactory.generatePublic(x509EncodedKeySpec);
      Cipher publicCipher = Cipher.getInstance("RSA");
      publicCipher.init(Cipher.DECRYPT_MODE, publicKey);
      result = publicCipher.doFinal(result);
      System.out.println("私钥加密，公钥解密--解密:"+new String(result));

2、公钥加密，私钥解密：

//公钥加密，私钥解密---加密
      x509EncodedKeySpec = new X509EncodedKeySpec(rsapublicKey.getEncoded());
      publicKeyFactory = KeyFactory.getInstance("RSA");
      publicKey = publicKeyFactory.generatePublic(x509EncodedKeySpec);
      publicCipher = Cipher.getInstance("RSA");
      publicCipher.init(Cipher.ENCRYPT_MODE, publicKey);
      result = publicCipher.doFinal(src.getBytes());
      System.out.println("公钥加密，私钥解密---加密:"+Base64.encodeBase64String(result));
      
      //公钥加密，私钥解密---解密
      pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaprivateKey.getEncoded());
      privateKeyFactory = KeyFactory.getInstance("RSA");
      privateKey = privateKeyFactory.generatePrivate(pkcs8EncodedKeySpec);
      privateCipher = Cipher.getInstance("RSA");
      privateCipher.init(Cipher.DECRYPT_MODE, privateKey);
      result = privateCipher.doFinal(result);
      System.out.println("公钥加密，私钥解密---解密:"+new String(result));

上述就是小编为大家分享的如何在java中实现RSA非对称加密算法了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。