public static void CreateDigitalSeal(string inputFile, string RSApublicReciever, string RSAprivateSender, string envelopeFile, string signatureFile, EncryptionMode encryptionMode, HashingMode hashingMode, SymetricAlgorithm algorithm, KeySize keySize)
{
DigitalEnvelope.CreateDigitalEnvelope(inputFile, RSApublicReciever, envelopeFile, encryptionMode, algorithm, keySize);
var envelope = FileManager.Read_Envelope(envelopeFile);
var hash = SHA.Hash(envelope.Data + envelope.Key, hashingMode);
DigitalSignature.CreateDigitalSignature_FromString(hash, RSAprivateSender, signatureFile, hashingMode);
}
public static void CheckDigitalSeal(string outputFile, string RSApublicSender, string RSAprivateReciever, string envelopeFile, string signatureFile, TextBox sealCheck, EncryptionMode encryptionMode, HashingMode hashingMode, SymetricAlgorithm algorithm)
{
DigitalEnvelope.OpenDigitalEnvelope(envelopeFile, RSAprivateReciever, outputFile, encryptionMode, algorithm);
var envelope = FileManager.Read_Envelope(envelopeFile);
var hash = SHA.Hash(envelope.Data + envelope.Key, hashingMode);
DigitalSignature.CheckDigitalSignature_FromString(hash, signatureFile, RSApublicSender, sealCheck, hashingMode);
}
public static void CheckDigitalSignature_FromString(string text, string signatureFile, string RSApublicKeyFile, TextBox outputTextBox, HashingMode mode)
{
var signature = FileManager.Read_Signature(signatureFile);
var publicKey = FileManager.Read_RSAKey(RSApublicKeyFile);
var signatureBytes = HelperFunctions.FromHexToByte(signature);
var decoded = RSA.Decrypt(Convert.ToBase64String(signatureBytes), publicKey.Modulus, publicKey.Exponent);
var hash = SHA.Hash(text, mode);
outputTextBox.Text = hash == decoded ? "Potpis je valjan!" : "Potpis nije valjan!";
}
public static void CreateDigitalSignature_FromString(string plainText, string RSAprivateKeyFile, string outputFile, HashingMode mode)
{
var hash = SHA.Hash(plainText, mode);
var privateKey = FileManager.Read_RSAKey(RSAprivateKeyFile);
var signature = RSA.Encrypt(hash, privateKey.Modulus, privateKey.Exponent);
var signatureBytes = Convert.FromBase64String(signature);
signature = HelperFunctions.FromByteToHex(signatureBytes);
FileManager.Write_Signature(outputFile, signature, privateKey.Modulus.Length * 4, mode);
}
