java中怎么实现RSA非对称加密算法

本篇文章为大家展示了java中怎么实现RSA非对称加密算法，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

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));

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