/// <summary>
/// Triggers processing of CryptoConfig object.
/// Passes Config object to processing class constructors.
/// </summary>
/// <param name="plainText">string coming from MainView's TextEditor.</param>
/// <param name="config">CryptoConfig object holding all config and cipher parameters.</param>
/// <returns>updated CryptoConfig object</returns>
public static CryptoConfig ProcessConfigOnSave(string plainText, CryptoConfig config)
{
if (config.IsEncryptActive)
{
if (config.IsPbeActive)
{
var pbeBuilder = CryptoFactory.CreatePbe(config);
config = pbeBuilder.GenerateKeyBytes();
}
var cipherBuilder = CryptoFactory.CreateCipher(config);
config = cipherBuilder.EncryptTextToBytes(plainText);
}
if (!config.IsIntegrityActive)
{
return(config);
}
if (config.Integrity == Integrity.Dsa)
{
var certBuilder = CryptoFactory.CreateCert(config);
certBuilder.GenerateCerts();
config = certBuilder.SignInput(config.Cipher);
}
else
{
var digestBuilder = CryptoFactory.CreateDigest(config);
config = digestBuilder.SignInput(config.Cipher);
}
return(config);
}
public void TestInvalidDigestCreateCall()
{
var config = new CryptoConfig {
};
Assert.Throws <ArgumentException>(
() => CryptoFactory.CreateDigest(config));
}
public void TestInvalidCertCreateConfig()
{
var config = new CryptoConfig
{
IsIntegrityActive = true,
Integrity = Integrity.Dsa
};
Assert.Throws <ArgumentException>(
() => CryptoFactory.CreateDigest(config));
}
/// <summary>
/// Triggers processing of CryptoConfig object.
/// Passes Config object to processing class constructors.
/// Also verifies integrity of cipher if used.
/// </summary>
/// <param name="config">config state after loading all files from disk.</param>
/// <returns>decrypted cipher in string representation.</returns>
public static string ProcessConfigOnLoad(CryptoConfig config)
{
if (config.IsIntegrityActive)
{
if (config.Integrity == Integrity.Dsa)
{
var certBuilder = CryptoFactory.CreateCert(config);
certBuilder.GenerateCerts();
config = certBuilder.SignInput(config.Cipher);
var result = certBuilder.VerifySign(config.Signature, config.Cipher);
Console.WriteLine($"Signature verified: {result}");
}
else
{
var certBuilder = CryptoFactory.CreateDigest(config);
config = certBuilder.SignInput(config.Cipher);
var result = certBuilder.VerifySign(config.Signature, config.Cipher);
Console.WriteLine($"Digest verified: {result}");
}
}
if (config.IsPbeActive)
{
var pbeBuilder = CryptoFactory.CreatePbe(config);
config = pbeBuilder.GenerateKeyBytes();
}
var cipherBuilder = CryptoFactory.CreateCipher(config);
try
{
return(cipherBuilder.DecryptBytesToText(Convert.FromBase64String(config.Cipher)));
}
catch (Org.BouncyCastle.Crypto.InvalidCipherTextException e)
{
Console.WriteLine(e);
return("GCM mac error.");
}
catch (FormatException e)
{
Console.WriteLine(e);
return("Format error.");
}
}
public void TestValidAesCmac()
{
var config = new CryptoConfig
{
IsIntegrityActive = true,
Integrity = Integrity.Digest,
IntegrityOptions = IntegrityOptions.AesCmac
};
var cipherBuilder = CryptoFactory.CreateDigest(config);
var bytes = Encoding.UTF8.GetBytes("Hallo Welt");
var base64String = Convert.ToBase64String(bytes);
config = cipherBuilder.SignInput(base64String);
var result = cipherBuilder.VerifySign(config.Signature, base64String);
Assert.True(result);
}