问题描述

我正在尝试实现 https://en.wikipedia.org/wiki 中提到的混合密码系统/Hybrid_cryptosystem

目前我已经实现了以下算法

At the moment I have implemented following algorithm

private void button1_Click(object sender, EventArgs e)
        {
            CspParameters cspParams = new CspParameters { ProviderType = 1 };
            RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(1024, cspParams);
            string publicKey = Convert.ToBase64String(rsaProvider.ExportCspBlob(false));
            string privateKey = Convert.ToBase64String(rsaProvider.ExportCspBlob(true));
            string symmericKey = "Kamran12";
            txtEncryptedData.Text = EncryptData(txtInputData.Text, symmericKey);
            string encryptedsymmetrickey = EncryptData(symmericKey, publicKey); //error line
            //string decryptsymmetrickey = encryptedsymmetrickey + privateKey;

            //string decrypteddata = encryptedData + decryptsymmetrickey;

        }

        public string EncryptData(string data, string key)
        {
            string encryptedData = null;

            byte[] buffer = Encoding.UTF8.GetBytes(data);

            DESCryptoServiceProvider desCryptSrvckey = new DESCryptoServiceProvider
            {
                Key = new UTF8Encoding().GetBytes(key)
            };
            desCryptSrvckey.IV = desCryptSrvckey.Key;

            using (MemoryStream stmCipherText = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(stmCipherText, desCryptSrvckey.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(buffer, 0, buffer.Length);
                    cs.FlushFinalBlock();


                    encryptedData = Encoding.UTF8.GetString(stmCipherText.ToArray());
                }
            }
            return encryptedData;
        }

但收到错误指定的密钥不是此算法的有效大小.在加密对称密钥时

But getting error Specified key is not a valid size for this algorithm. at the time of encrypting the symmetric key

推荐答案

您正在尝试使用带有 RSA 公钥的(不安全的)DES 算法进行加密.这总是会失败，DESCryptoServiceProvider 不接受 RSA 密钥.为此，您需要一个 RSACryptoServiceProvider.

You are trying to encrypt using the (insecure) DES algorithm with an RSA public key. That's always going to fail, DESCryptoServiceProvider doesn't accept RSA keys. You'd need an RSACryptoServiceProvider for that.

您可能需要考虑使用已经实现混合加密(PGP、CMS 或其中一种专有协议)的特定库.您的解决方案最终可能会运行，但它不是安全的.

You may want to consider using a specific library that already implements hybrid cryptography (PGP, CMS or one of the proprietary protocols). The way you are going at it your solution may run in the end, but it will not be secure.

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