public static byte[] ReadNonce(string filePath, byte[] salt, int parametersLength)
{
NullChecks.ByteArray(salt);
int headerLength = 0;
int offset = salt.Length + parametersLength;
if (Globals.EncryptionAlgorithm == (int)Cipher.XChaCha20 || Globals.EncryptionAlgorithm == (int)Cipher.XSalsa20)
{
headerLength = Constants.XChaChaNonceLength;
}
else if (Globals.EncryptionAlgorithm == (int)Cipher.AesCBC)
{
headerLength = Constants.AesNonceLength;
}
return(ReadHeader(filePath, headerLength, offset));
}
public static bool AppendHash(string filePath, byte[] fileHash)
{
try
{
NullChecks.ByteArray(fileHash);
using (var fileStream = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.Read))
{
fileStream.Write(fileHash, 0, fileHash.Length);
}
return(true);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to append the MAC to the file. This data is required for decryption of the file.");
return(false);
}
}