Шифрование RSA больших данных в C#

хорошо, я, наконец, придумал решение проблемы, которую я изложил в своем первоначальном посте. Это то, что я не тщательно протестировал или что-то еще, но что-то я понял из небольшого процесса проб и ошибок.

вот текущий код у меня есть:

    public static string Encrypt(string dataToEncrypt, RSAParameters publicKeyInfo)
    {
        //// Our bytearray to hold all of our data after the encryption
        byte[] encryptedBytes = new byte[0];
        using (var RSA = new RSACryptoServiceProvider())
        {
            try
            {
                //Create a new instance of RSACryptoServiceProvider.
                UTF8Encoding encoder = new UTF8Encoding();

                byte[] encryptThis = encoder.GetBytes(dataToEncrypt);

                //// Importing the public key
                RSA.ImportParameters(publicKeyInfo);

                int blockSize = (RSA.KeySize / 8) - 32;

                //// buffer to write byte sequence of the given block_size
                byte[] buffer = new byte[blockSize];

                byte[] encryptedBuffer = new byte[blockSize];

                //// Initializing our encryptedBytes array to a suitable size, depending on the size of data to be encrypted
                encryptedBytes = new byte[encryptThis.Length + blockSize - (encryptThis.Length % blockSize) + 32];

                for (int i = 0; i < encryptThis.Length; i += blockSize)
                {
                    //// If there is extra info to be parsed, but not enough to fill out a complete bytearray, fit array for last bit of data
                    if (2 * i > encryptThis.Length && ((encryptThis.Length - i) % blockSize != 0))
                    {
                        buffer = new byte[encryptThis.Length - i];
                        blockSize = encryptThis.Length - i;
                    }

                    //// If the amount of bytes we need to decrypt isn't enough to fill out a block, only decrypt part of it
                    if (encryptThis.Length < blockSize)
                    {
                        buffer = new byte[encryptThis.Length];
                        blockSize = encryptThis.Length;
                    }

                    //// encrypt the specified size of data, then add to final array.
                    Buffer.BlockCopy(encryptThis, i, buffer, 0, blockSize);
                    encryptedBuffer = RSA.Encrypt(buffer, false);
                    encryptedBuffer.CopyTo(encryptedBytes, i);
                }
            }
            catch (CryptographicException e)
            {
                Console.Write(e);
            }
            finally
            {
                //// Clear the RSA key container, deleting generated keys.
                RSA.PersistKeyInCsp = false;
            }
        }
        //// Convert the byteArray using Base64 and returns as an encrypted string
        return Convert.ToBase64String(encryptedBytes);
    }

    /// <summary>
    /// Decrypt this message using this key
    /// </summary>
    /// <param name="dataToDecrypt">
    /// The data To decrypt.
    /// </param>
    /// <param name="privateKeyInfo">
    /// The private Key Info.
    /// </param>
    /// <returns>
    /// The decrypted data.
    /// </returns>
    public static string Decrypt(string dataToDecrypt, RSAParameters privateKeyInfo)
    {
        //// The bytearray to hold all of our data after decryption
        byte[] decryptedBytes;

        //Create a new instance of RSACryptoServiceProvider.
        using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
        {
            try
            {
                byte[] bytesToDecrypt = Convert.FromBase64String(dataToDecrypt);

                //// Import the private key info
                RSA.ImportParameters(privateKeyInfo);

                //// No need to subtract padding size when decrypting (OR do I?)
                int blockSize = RSA.KeySize / 8;

                //// buffer to write byte sequence of the given block_size
                byte[] buffer = new byte[blockSize];

                //// buffer containing decrypted information
                byte[] decryptedBuffer = new byte[blockSize];

                //// Initializes our array to make sure it can hold at least the amount needed to decrypt.
                decryptedBytes = new byte[dataToDecrypt.Length];

                for (int i = 0; i < bytesToDecrypt.Length; i += blockSize)
                {
                    if (2 * i > bytesToDecrypt.Length && ((bytesToDecrypt.Length - i) % blockSize != 0))
                    {
                        buffer = new byte[bytesToDecrypt.Length - i];
                        blockSize = bytesToDecrypt.Length - i;
                    }

                    //// If the amount of bytes we need to decrypt isn't enough to fill out a block, only decrypt part of it
                    if (bytesToDecrypt.Length < blockSize)
                    {
                        buffer = new byte[bytesToDecrypt.Length];
                        blockSize = bytesToDecrypt.Length;
                    }

                    Buffer.BlockCopy(bytesToDecrypt, i, buffer, 0, blockSize);
                    decryptedBuffer = RSA.Decrypt(buffer, false);
                    decryptedBuffer.CopyTo(decryptedBytes, i);
                }
            }
            finally
            {
                //// Clear the RSA key container, deleting generated keys.
                RSA.PersistKeyInCsp = false;
            }
        }

        //// We encode each byte with UTF8 and then write to a string while trimming off the extra empty data created by the overhead.
        var encoder = new UTF8Encoding();
        return encoder.GetString(decryptedBytes).TrimEnd(new[] { '' });

    }

возможно, мне чего-то не хватает, но похоже, что ваша функция Encrypt() не использует ни содержимое encryptKey.