KDBX — KeepPass File Format

KeePass Password Safe is a free and open-source password manager primarily for Windows. It officially supports macOS and Linux operating systems through the use of Mono. Additionally, there are several unofficial ports for Windows Phone, Android, iOS, and BlackBerry devices. KeePass stores usernames, passwords, and other fields, including free-form notes and file attachments, in an encrypted file. This file can be protected by a master password, keyfile, and/or the current Windows account details. By default, the KeePass database is stored on a local file system (as opposed to cloud storage).

— https://en.wikipedia.org/wiki/KeePass

ID	DataType	Header Name	Description
0x00	[]byte	EndHeader	defines the end limit for the headers block
0x01	[]byte	Comment	is current ignored by KeePass and alternate apps
0x02	[]byte	CipherID	represents the UUID of the cipher algorithm
0x03	uint32	CompressionFlags	determines if the database is compressed or not
0x04	[]byte	MasterSeed	salt to concatenate to the master key
0x05	[]byte	TransformSeed	seed for AES.Encrypt to generate the master key
0x06	uint64	TransformRounds	number of rounds to compute the master key
0x07	[]byte	EncryptionIV	defines the initialization vector of the cipher
0x08	[]byte	ProtectedStreamKey	used to obfuscate some fields of the decrypted file
0x09	[]byte	StreamStartBytes	portion of the decrypted database for verification
0x10	uint32	InnerRandomStreamID	algorithm used for individual password obfuscation