/// <summary>
/// Converts variables into easy-to-manage method calls to create a byte array for metadata
/// </summary>
/// <param name="checksumHashType">Type of checksum used to generate the file hash</param>
/// <param name="originalFileHash">File hash of the original file (checksum generated using previous hash type)</param>
/// <param name="passwordHint">A password hint for the password used to encrypt the file</param>
/// <param name="compressionModeUsed">Compression mode used to compress the file</param>
/// <param name="originalFileName">The name of the original file</param>
public DynamicMetadata(Checksums.ChecksumType checksumHashType, byte[] originalFileHash, string passwordHint, string compressionModeUsed, string originalFileName)
{
_faesIdentifier = CryptUtils.ConvertStringToBytes(CryptUtils.GetCryptIdentifier());
_hashType = CryptUtils.ConvertChecksumTypeToBytes(checksumHashType);
_originalFileHash = originalFileHash;
_encryptionTimestamp = BitConverter.GetBytes((long)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
_passwordHint = CryptUtils.ConvertStringToBytes(passwordHint.TrimEnd('\n', '\r'));
_encryptionVersion = CryptUtils.ConvertStringToBytes(FileAES_Utilities.GetVersion());
_compressionMode = CryptUtils.ConvertStringToBytes(compressionModeUsed);
_originalFileName = CryptUtils.ConvertStringToBytes(originalFileName);
_totalMetadataSize = (4 + 2 + _faesIdentifier.Length + 2 + _hashType.Length + 2 + _originalFileHash.Length + 2 + _encryptionTimestamp.Length + 2 + _passwordHint.Length + 2 + _encryptionVersion.Length + 2 + _compressionMode.Length + 2 + _originalFileName.Length);
}
/// <summary>
/// Converts a ChecksumType to a byte array.
/// </summary>
/// <param name="checksumHashType">Checksum Type</param>
/// <returns>Byte Array</returns>
public static byte[] ConvertChecksumTypeToBytes(Checksums.ChecksumType checksumHashType)
{
switch (checksumHashType)
{
case Checksums.ChecksumType.SHA1:
return(BitConverter.GetBytes(1));
case Checksums.ChecksumType.SHA256:
return(BitConverter.GetBytes(2));
case Checksums.ChecksumType.SHA512:
return(BitConverter.GetBytes(3));
case Checksums.ChecksumType.SHA384:
return(BitConverter.GetBytes(4));
default:
return(BitConverter.GetBytes(0));
}
}
public MetaData(Checksums.ChecksumType checksumHashType, byte[] originalFileHash, string passwordHint, string compressionModeUsed, string originalFileName)
{
_dynamicMetadata = new DynamicMetadata(checksumHashType, originalFileHash, passwordHint, compressionModeUsed, originalFileName);
}