/// <summary>
/// The command method to encrypt the given data
/// </summary>
private void Encrypt()
{
//Convert the string key and iv to bytes
var secretKey = ByteConvert.HexStringToBytes(SecretKey);
var iv = ByteConvert.HexStringToBytes(IV);
//fields for saving the plain and encrypted byte arrays
byte[] encrypted;
byte[] plainBytes;
//Get the data and encrypt it acording to the selected format
switch (DataInput.DataFormatSelected)
{
//Encrypt a text string
case Format.Text:
//Encrypt with the selected cipher and return the encrypted byte array
encrypted = SelectedCipherApi.EncryptText(SelectedAlgorithim, SelectedKeySize, secretKey, iv, DataInput.Data);
//Converts the byte array to a hex string
EncryptedText = ByteConvert.BytesToHexString(encrypted);
break;
//Encrypt a hex string
case Format.Hex:
//Convert the plain hex string to byte array
plainBytes = ByteConvert.HexStringToBytes(DataInput.Data);
//Encrypt with the selected cipher and return the encrypted byte array
encrypted = SelectedCipherApi.EncryptBytes(SelectedAlgorithim, SelectedKeySize, secretKey, iv, plainBytes);
//Converts the byte array to a hex string
EncryptedText = ByteConvert.BytesToHexString(encrypted);
break;
//Encrypt a file
case Format.File:
//Gets the file as a byte array
plainBytes = File.ReadAllBytes(DataInput.Data);
//Encrypt with the selected cipher and return the encrypted byte array
encrypted = SelectedCipherApi.EncryptBytes(SelectedAlgorithim, SelectedKeySize, secretKey, iv, plainBytes);
//Gets the file extension of the plain original file
var extension = Path.GetExtension(DataInput.Data);
//Adds the "Encrypted" text to the encrypted file name
EncryptedFilePath = Path.Combine(Directory.GetParent(DataInput.Data).ToString(), Path.GetFileNameWithoutExtension(DataInput.Data) + ".Encrypted" + extension);
//Writes all the bytes to the encrypted file
File.WriteAllBytes(EncryptedFilePath, encrypted);
break;
}
}
/// <summary>
/// The command method when a different algrithim is selected
/// </summary>
private void ChangedAlgorithim()
{
//Gets the available key size of the selected algorithim
KeySizes = SelectedCipherApi.GetKeySizes(SelectedAlgorithim);
//Set default key size, first one in the list
SelectedKeySize = KeySizes[0];
//Gets the available iv size of the selected algorithim
IvSize = SelectedCipherApi.GetIvSize(SelectedAlgorithim);
ClearKeyValue();
ClearEnDecryptedValues();
}
/// <summary>
/// The command methods to generate a random key
/// </summary>
private void GenerateKey()
{
//Gets a list of byte arrays containing the secret key and if available the iv
var keyAndIv = SelectedCipherApi.GenerateKey(SelectedAlgorithim, SelectedKeySize);
//Convert the byte array to a string
SecretKey = ByteConvert.BytesToHexString(keyAndIv[0]);
//true if an iv byte array exists
if (keyAndIv.Count > 1)
{
//Convert the byte array to a string
IV = ByteConvert.BytesToHexString(keyAndIv[1]);
}
}
/// <summary>
/// The command method to decrypt the given data
/// </summary>
private void Decrypt()
{
//field for saving the encrypted and decrypted byte arrays
byte[] encrypted;
byte[] decryptedBytes;
//Convert the secret key and iv to byte arrays
var secretKey = ByteConvert.HexStringToBytes(SecretKey);
var iv = ByteConvert.HexStringToBytes(IV);
try
{
//Decrypt the data according to the selected file format
switch (DataInput.DataFormatSelected)
{
//Decrypt to a regular string
case Format.Text:
//Convert the text string to a byte array
encrypted = ByteConvert.HexStringToBytes(EncryptedText);
//Decrypt the byte array to a text string
DecryptedText = SelectedCipherApi.DecryptToText(SelectedAlgorithim, SelectedKeySize, secretKey, iv, encrypted);
break;
case Format.Hex:
//Convert the hex string to a byte array
encrypted = ByteConvert.HexStringToBytes(EncryptedText);
//Decrypt the byte array to a decrypted byte array
decryptedBytes = SelectedCipherApi.DecryptToBytes(SelectedAlgorithim, SelectedKeySize, secretKey, iv, encrypted);
//Convert the decrypted byte array to a hex string
DecryptedText = ByteConvert.BytesToHexString(decryptedBytes);
break;
case Format.File:
//Get the encrypted file as a byte array
encrypted = ByteConvert.FileToBytes(EncryptedFilePath);
//Decrypt the byte array to a decrypted byte array
decryptedBytes = SelectedCipherApi.DecryptToBytes(SelectedAlgorithim, SelectedKeySize, secretKey, iv, encrypted);
//Create a new file name with the encrypted file path and the "Decrypted" text
DecryptedFilePath = Path.Combine(Directory.GetParent(EncryptedFilePath).ToString(), Path.GetFileName(EncryptedFilePath).Replace("Encrypted", "Decrypted"));
//Write all byte to the decrypted file
File.WriteAllBytes(DecryptedFilePath, decryptedBytes);
break;
}
}
//catches msdn exceptions
catch (CryptographicException msdnException)
{
//Open a error message box
Dialog.OpenErrorMessageBoxAsync(msdnException, "Decryption Failure", WindowDialogType.Error);
}
//catches bouncy castle exceptions
catch (CryptoException bouncyException)
{
//Open a error message box
Dialog.OpenErrorMessageBoxAsync(bouncyException, "Decryption Failure", WindowDialogType.Error);
}
//Catch any other errors
catch (Exception exception)
{
//Open a error message box
Dialog.OpenErrorMessageBoxAsync(exception, "Unknown Error, Contact Developer", WindowDialogType.Error);
}
}
