/// <summary>
/// AES Encryption service.
/// </summary>
/// <param name="toEncryption">CLI input model.</param>
/// <returns>CLI output model with information about decryption.</returns>
public static SymmetricCryptographyCliOutput EncryptionRequest(ISymmetricCryptographyCliInput toEncryption, CryptoProvider cryptoProvider)
{
Log.Information($"New aes encryption request => {toEncryption.CipherType}");
byte[] key = null;
byte[] IV = null;
// check if user provide encryption key
if (!string.IsNullOrEmpty(toEncryption.Key))
{
Log.Information("Working with the provided encryption key.");
key = Convert.FromBase64String(toEncryption.Key);
}
else
{
Log.Information("Generating new encryption key.");
key = cryptoProvider.GenerateKey(toEncryption.CipherType.KeySize);
}
// check if user provide IV
if (!string.IsNullOrEmpty(toEncryption.InitializationVector) && toEncryption.CipherType.CipherMode != CipherMode.ECB)
{
Log.Information("Working with the provided initialization vector.");
Console.WriteLine("Using same initialization vector for more then one encryption is not recommended!");
IV = Convert.FromBase64String(toEncryption.InitializationVector);
}
else
{
Log.Information("Generating new initialization vector.");
IV = cryptoProvider.GenerateInitializationVector();
}
var encrypted = cryptoProvider.Encrypt(toEncryption.Content, key, IV, toEncryption.CipherType.CipherMode);
Log.Information("Successfully encrypted.");
if (toEncryption.CipherType.CipherMode == CipherMode.ECB)
{
return(new SymmetricCryptographyCliOutput(key, encrypted, toEncryption.CipherType));
}
else
{
return(new SymmetricCryptographyCliOutput(IV, key, encrypted, toEncryption.CipherType));
}
}
/// <summary>
/// AES Decryption service.
/// </summary>
/// <param name="toDecryption">CLI input model.</param>
/// <returns>CLI output model with information about decryption.</returns>
public static SymmetricCryptographyCliOutput DecryptionRequest(ISymmetricCryptographyCliInput toDecryption, CryptoProvider cryptoProvider)
{
Log.Information($"New aes decryption request => {toDecryption.CipherType}");
if (string.IsNullOrEmpty(toDecryption.Content))
{
Log.Information("Data which should be decrypted missing - asking user for input.");
toDecryption.Content = CLIHelpers.InformationProvider("Enter entrycpted phrase");
}
if (string.IsNullOrEmpty(toDecryption.Key))
{
Log.Information("The encryption key is missing - asking user for input.");
toDecryption.Key = CLIHelpers.InformationProvider("Enter encryption key");
}
if (string.IsNullOrEmpty(toDecryption.InitializationVector) && toDecryption.CipherType.CipherMode != CipherMode.ECB)
{
Log.Information("The initialization vector is missing - asking user for input");
toDecryption.InitializationVector = CLIHelpers.InformationProvider("Enter initialization vector");
}
SymmetricCryptographyProperties cryptoProperties;
if (toDecryption.CipherType.CipherMode == CipherMode.ECB)
{
// ignore IV when ECB cipher mode is used
cryptoProperties = new SymmetricCryptographyProperties(toDecryption.Key, toDecryption.CipherType.CipherMode);
}
else
{
cryptoProperties = new SymmetricCryptographyProperties(toDecryption.Key, toDecryption.InitializationVector, toDecryption.CipherType.CipherMode);
}
cryptoProvider.CryptographyProperties = cryptoProperties;
var decrypted = cryptoProvider.Decrypt(toDecryption.Content);
Log.Information("Successfully decrypted.");
return(new SymmetricCryptographyCliOutput(decrypted));
}
/// <summary>
/// Encryption services processor.
/// </summary>
/// <param name="cliInput">CLI options.</param>
public static SymmetricCryptographyCliOutput ProcessOperation(ISymmetricCryptographyCliInput cliInput)
{
Log.Information($"Command for {cliInput.CipherType.CryptographyStandard.ToString()} de/encryption successfully parsed.");
// warning when IV is entered by user and ECB cipher mode is used
if (!string.IsNullOrEmpty(cliInput.InitializationVector) && cliInput.CipherType.CipherMode == CipherMode.ECB)
{
Log.Information("Initialization vector is not valid for ECB cipher mode and will be ignored.");
}
// Choosing cipher type
CryptoProvider cryptoProvider;
switch (cliInput.CipherType.CryptographyStandard)
{
case CryptographyStandard.Aes:
cryptoProvider = new AesProvider();
break;
case CryptographyStandard.TripleDes:
cryptoProvider = new TripleDesProvider();
break;
default:
throw new CryptographicException($"Unknown cryptography standard {cliInput.CipherType.CryptographyStandard}.");
}
if (cliInput.Encryption)
{
return(EncryptionRequest(cliInput, cryptoProvider)); // TODO opravit... en/decryption should be enum
}
else
{
return(DecryptionRequest(cliInput, cryptoProvider));
}
}
