public static HelperClasses.Envelope Read_Envelope(string file)
{
var streamReader = new StreamReader(Program.Direktorij + file);
string currentLine;
var envelope = new HelperClasses.Envelope();
while (streamReader.ReadLine() != "Envelope data:")
{
}
while ((currentLine = streamReader.ReadLine()) != "")
{
envelope.Data += currentLine?.Substring(4);
}
while (streamReader.ReadLine() != "Envelope crypt key:")
{
}
while ((currentLine = streamReader.ReadLine()) != "---END OS2 CRYPTO DATA---" && currentLine != "")
{
envelope.Key += currentLine?.Substring(4);
}
streamReader.Close();
return(envelope);
}
public static void CreateDigitalEnvelope(string textFile, string RSApublicKey, string outputFile, EncryptionMode mode, SymetricAlgorithm algorithm, KeySize keySize)
{
var envelope = new HelperClasses.Envelope();
var text = FileManager.ReadFile_Byte(textFile);
var vector = FileManager.ReadFile_IVector("IVector.txt");
byte[] cryptedText;
byte[] key;
if (algorithm == SymetricAlgorithm.THREE_DES)
{
key = HelperFunctions.GenerateKey((int)keySize);
cryptedText = THREE_DES.Encrypt(text, key, mode);
}
else
{
key = HelperFunctions.GenerateKey((int)keySize);
cryptedText = AES.Encrypt(text, key, vector, mode);
}
var keyHex = HelperFunctions.FromByteToHex(key);
var publicKey = FileManager.Read_RSAKey(RSApublicKey);
var RSAcrypted = RSA.Encrypt(keyHex, publicKey.Modulus, publicKey.Exponent);
var cryptedKey = Convert.FromBase64String(RSAcrypted);
RSAcrypted = HelperFunctions.FromByteToHex(cryptedKey);
envelope.Data = Convert.ToBase64String(cryptedText);
envelope.Key = RSAcrypted;
FileManager.Write_Envelope(outputFile, envelope, key.Length * 8, publicKey.Modulus.Length * 4, algorithm);
}
public static void Write_Envelope(string file, HelperClasses.Envelope envelope, int symetricAlgorithmKeyLenght, int RSAKeyLength, SymetricAlgorithm algorithm)
{
var streamWriter = new StreamWriter(Program.Direktorij + file);
streamWriter.WriteLine("---BEGIN OS 2 CRYPTO DATA---");
streamWriter.WriteLine();
streamWriter.WriteLine("Description");
streamWriter.WriteLine(" Envelope");
streamWriter.WriteLine();
streamWriter.WriteLine("File name:");
var breadCrumbs = file.Split('\\');
streamWriter.WriteLine(" " + breadCrumbs[breadCrumbs.Length - 1]);
streamWriter.WriteLine();
streamWriter.WriteLine("Method:");
streamWriter.WriteLine(algorithm == SymetricAlgorithm.AES ? " AES" : " 3DES");
streamWriter.WriteLine(" RSA");
streamWriter.WriteLine();
streamWriter.WriteLine("Key length:");
streamWriter.WriteLine(" " + HelperFunctions.FromIntToHex(symetricAlgorithmKeyLenght));
streamWriter.WriteLine(" " + HelperFunctions.FromIntToHex(RSAKeyLength));
streamWriter.WriteLine();
streamWriter.WriteLine("Envelope data:");
var NumLines = (double)envelope.Data.Length / 60;
if (Math.Truncate(NumLines) < NumLines)
{
NumLines++;
}
for (var i = 0; i < Math.Truncate(NumLines); i++)
{
if (envelope.Data.Length - i * 60 < 60)
{
streamWriter.WriteLine(" " + envelope.Data.Substring(i * 60, envelope.Data.Length - i * 60));
}
else
{
streamWriter.WriteLine(" " + envelope.Data.Substring(i * 60, 60));
}
}
streamWriter.WriteLine();
streamWriter.WriteLine("Envelope crypt key:");
NumLines = (double)envelope.Key.Length / 60;
if (Math.Truncate(NumLines) < NumLines)
{
NumLines++;
}
for (var i = 0; i < Math.Truncate(NumLines); i++)
{
if (envelope.Key.Length - i * 60 < 60)
{
streamWriter.WriteLine(" " + envelope.Key.Substring(i * 60, envelope.Key.Length - i * 60));
}
else
{
streamWriter.WriteLine(" " + envelope.Key.Substring(i * 60, 60));
}
}
streamWriter.WriteLine();
streamWriter.WriteLine("---END OS2 CRYPTO DATA---");
streamWriter.Close();
}
