private static byte[] EncryptFileHeader(string inputFilePath, byte[] ephemeralPublicKey, byte[] dataEncryptionKey, byte[] nonce, byte[] keyEncryptionKey)
{
long fileLength = FileHandling.GetFileLength(inputFilePath);
byte[] lastChunkLength = BitConversion.GetBytes(Convert.ToInt32(fileLength % Constants.FileChunkSize));
byte[] fileNameLength = FileHeaders.GetFileNameLength(inputFilePath);
byte[] fileHeader = Arrays.Concat(lastChunkLength, fileNameLength, dataEncryptionKey);
byte[] additionalData = HeaderEncryption.ComputeAdditionalData(fileLength, ephemeralPublicKey);
return(HeaderEncryption.Encrypt(fileHeader, nonce, keyEncryptionKey, additionalData));
}
private static byte[] EncryptFileHeader(string inputFilePath, byte[] dataEncryptionKey, byte[] nonce, byte[] keyEncryptionKey)
{
byte[] keyCommitmentBlock = ChunkHandling.GetKeyCommitmentBlock();
long fileLength = FileHandling.GetFileLength(inputFilePath);
byte[] lastChunkLength = BitConverter.GetBytes(Convert.ToInt32(fileLength % Constants.FileChunkSize));
byte[] fileNameLength = FileHeaders.GetFileNameLength(inputFilePath);
byte[] fileHeader = Utilities.ConcatArrays(keyCommitmentBlock, lastChunkLength, fileNameLength, dataEncryptionKey);
byte[] additionalData = HeaderEncryption.ComputeAdditionalData(fileLength);
return(HeaderEncryption.Encrypt(fileHeader, nonce, keyEncryptionKey, additionalData));
}
private static byte[] DecryptFileHeader(string inputFilePath, byte[] encryptedHeader, byte[] nonce, byte[] keyEncryptionKey)
{
byte[] additionalData = HeaderEncryption.GetAdditionalData(inputFilePath);
return(HeaderEncryption.Decrypt(encryptedHeader, nonce, keyEncryptionKey, additionalData));
}
private static byte[] DecryptFileHeader(FileStream inputFile, byte[] ephemeralPublicKey, byte[] encryptedHeader, byte[] nonce, byte[] keyEncryptionKey)
{
byte[] additionalData = HeaderEncryption.GetAdditionalData(inputFile, ephemeralPublicKey);
return(HeaderEncryption.Decrypt(encryptedHeader, nonce, keyEncryptionKey, additionalData));
}