使用 Java 进行 RSA 加密/解密_Java开发问题-跟版网

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问题描述

我正在做一个简单的程序来使用 Java 中的 RSA 算法进行加密/解密.我创建一个密码对象如下:

I am doing a simple program to encrypt/decrypt using RSA algorithm in Java. I create a cipher object as follows:

//Create a Cipher object
Cipher rsaCipher = Cipher.getInstance("RSA/ECB/NoPadding");

我通过调用 encrypt 函数进行加密:

I do the encryption by calling the encrypt function:

String cipher=encrypt(textByte, pair, rsaCipher);
System.out.println("The Encryption using RSA Algorithm : "+cipher);

而解密为:

//Decryption
String plain=decrypt(Base64.decodeBase64(cipher),pair, rsaCipher);
System.out.println("The Decryption using RSA Algorithm : "+plain);

当我显示输出时，解密输出在原文前返回一个长空格:

When I display the output, the decryption output returns a long space before the original text:

但是，当我将用于创建 Cipher 对象的代码编辑为://创建一个密码对象密码rsaCipher = Cipher.getInstance("RSA");

However, when I edit the code for creating the Cipher object to be: //Create a Cipher object Cipher rsaCipher = Cipher.getInstance("RSA");

即删除操作模式和填充参数，问题得到解决，输出变为:

i.e, removed the operation mode and padding arguments, the problem get resolved and the output becomes:

问题出在哪里.在第一种情况下(出现空格时)，我指定了 NoPadding?为什么空格会出现在解密的消息中?即使我使用了填充，我希望这不应该发生.

Where is the problem. In the first case (when the space appears), I specified NoPadding? Why the spaces appears in the decrypted message ? Even if I used padding, I expect this should not happen.

这是加密和解密方法:

public static String encrypt(byte[] textBytes, KeyPair pair, Cipher rsaCipher) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
    //get the public key
    PublicKey pk=pair.getPublic(); 


    //Initialize the cipher for encryption. Use the public key.
    rsaCipher.init(Cipher.ENCRYPT_MODE, pk);

    //Perform the encryption using doFinal
    byte[] encByte = rsaCipher.doFinal(textBytes);

    // converts to base64 for easier display.
    byte[] base64Cipher = Base64.encodeBase64(encByte);

    return new String(base64Cipher);
}//end encrypt

public static String decrypt(byte[] cipherBytes, KeyPair pair, Cipher rsaCipher) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException
{
    //get the public key
    PrivateKey pvk=pair.getPrivate(); 

    //Create a Cipher object
    //Cipher rsaCipher = Cipher.getInstance("RSA/ECB/NoPadding");

    //Initialize the cipher for encryption. Use the public key.
    rsaCipher.init(Cipher.DECRYPT_MODE, pvk);

    //Perform the encryption using doFinal
    byte[] decByte = rsaCipher.doFinal(cipherBytes);

    return new String(decByte);

}//end decrypt

使用 Java 进行 RSA 加密/解密

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