c# - 使用接收者的公钥加密

Question

我正在尝试使用接收方公钥加密我的字符串文件，但我无法做到这一点。我正在使用充气城堡方法来生成密钥。我导出了公钥并将其设为全局。现在我想用这个公钥加密消息，但我做不到。请帮帮我。请查看我的代码。

    string PubKey;                  // global variable
    string inputMessage = 12345;    // message to be encrypted

     private void KeyGeneration() //   function for generating the keys. 
    {
        RsaKeyPairGenerator generator = new RsaKeyPairGenerator();
        generator.Init(new KeyGenerationParameters(new SecureRandom(), 1024));
        AsymmetricCipherKeyPair keyPair = generator.GenerateKeyPair();
        RsaKeyParameters publicKey = (RsaKeyParameters)keyPair.Public;

        // Save to export format

        SubjectPublicKeyInfo info = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keyPair.Public);
        byte[] ret = info.GetEncoded();
        PubKey = Convert.ToBase64String(ret);


        PrivateKeyInfo pKinfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(keyPair.Private);
        byte[] privRet = pKinfo.GetEncoded();
        PrivKey = Convert.ToBase64String(privRet);
    }


     private void Create_PC_Req_Click(object sender, EventArgs e) // this is my button event I want to encrypt my message here 
    {


        UTF8Encoding utf8enc = new UTF8Encoding();
        byte[] inputBytes = utf8enc.GetBytes(inputMessage);

        RsaKeyPairGenerator rsaKeyPairGnr = new RsaKeyPairGenerator();
        rsaKeyPairGnr.Init(new KeyGenerationParameters(new SecureRandom(), 512));
        AsymmetricCipherKeyPair keyPair = rsaKeyPairGnr.GenerateKeyPair();
        RsaKeyParameters publicKey = (RsaKeyParameters)keyPair.Public;

        IAsymmetricBlockCipher cipher = new RsaEngine();

        // this is the way of encryption when you are generating a keys here and extracting a public key here but I want to encrypt my message with the public key which I made global.

        cipher.Init(true, publicKey);

        //Encrypting the input bytes
        byte[] cipheredBytes = cipher.ProcessBlock(inputBytes, 0, inputMessage.Length);
        string p = utf8enc.GetString(cipheredBytes);
        textBox4.Text = p;
    }