public static byte[] GetAdditionalData(FileStream inputFile, byte[] ephemeralPublicKey)
{
byte[] ciphertextLength = BitConversion.GetBytes(inputFile.Length - Constants.FileHeadersLength);
byte[] magicBytes = FileHeaders.ReadMagicBytes(inputFile);
byte[] formatVersion = FileHeaders.ReadFileFormatVersion(inputFile);
FileHeaders.ValidateFormatVersion(formatVersion, Constants.EncryptionVersion);
return(Arrays.Concat(ciphertextLength, magicBytes, formatVersion, ephemeralPublicKey));
}
public static byte[] GetAdditionalData(string inputFilePath)
{
byte[] magicBytes = FileHeaders.ReadMagicBytes(inputFilePath);
byte[] formatVersion = FileHeaders.ReadFileFormatVersion(inputFilePath);
FileHeaders.ValidateFormatVersion(inputFilePath, formatVersion, Constants.EncryptionVersion);
long fileLength = FileHandling.GetFileLength(inputFilePath);
int headersLength = FileHeaders.GetHeadersLength();
byte[] ciphertextLength = BitConverter.GetBytes(fileLength - headersLength);
return(Utilities.ConcatArrays(magicBytes, formatVersion, ciphertextLength));
}