如何在java中實現RSA非對稱加密算法

這期內容當中小編將會給大家帶來有關如何在java中實現RSA非對稱加密算法，文章內容豐富且以專業的角度為大家分析和敘述，閱讀完這篇文章希望大家可以有所收獲。

初始化密鑰：

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

1、私鑰加密，公鑰解密：

//私鑰加密，公鑰解密--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("私鑰加密，公鑰解密--加密:"+Base64.encodeBase64String(result));
      
      //私鑰加密，公鑰解密--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("私鑰加密，公鑰解密--解密:"+new String(result));

2、公鑰加密，私鑰解密：

//公鑰加密，私鑰解密---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("公鑰加密，私鑰解密---加密:"+Base64.encodeBase64String(result));
      
      //公鑰加密，私鑰解密---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("公鑰加密，私鑰解密---解密:"+new String(result));

上述就是小編為大家分享的如何在java中實現RSA非對稱加密算法了，如果剛好有類似的疑惑，不妨參照上述分析進行理解。如果想知道更多相關知識，歡迎關注億速云行業資訊頻道。