/// <summary>
/// Constructor.
/// </summary>
public AesEncryption()
{
// Read the key and initialization vector from the secret file.
string keyEncoded;
string ivEncoded;
using (StreamReader reader = new StreamReader(SecretFile))
{
keyEncoded = reader.ReadLine();
ivEncoded = reader.ReadLine();
}
// Decode data and store it in the appropriate instance fields.
ConvertService convertService = new ConvertService();
this.key = convertService.DecodeToByteArray(keyEncoded);
this.initializationVector = convertService.DecodeToByteArray(ivEncoded);
}
string ICrypto.Decrypt(string textToDecrypt)
{
string decryptedText = null;
byte[] bytesToDecrypt;
// Convert the byte array with the encrypted text into a string.
ConvertService convertService = new ConvertService();
bytesToDecrypt = convertService.DecodeToByteArray(textToDecrypt);
// Prepare an AES object.
using (Aes aes = Aes.Create())
{
aes.Key = this.key;
aes.IV = this.initializationVector;
// Create a decryptor for stream transformation.
//ICryptoTransform decryptor = aes.CreateEncryptor(aes.Key, aes.IV);
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
// Prepare necessary streams and encrypt the given text.
using (MemoryStream memoryStream = new MemoryStream(bytesToDecrypt))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
{
// Read (and decrypt) the given text.
decryptedText = streamReader.ReadToEnd();
}
}
}
}
return(decryptedText);
}
