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              October 26, 2020 21:58
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                Keepass file format explained
              
          
Original article
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Keepass file format explained

I’m currently working (I’m just at the beginning, and I’m quite slow) on a personal project that will use Keepass files (kdb and kdbx).

I tried to find some documentation about .kdb and .kdbx format, but I didn’t find anything, even in the Keepass official website. I you want to know how these file formats are structured, you must read Keepass’s source code. So I wrote this article that explains how Keepass file format are structured, maybe it will help someone.

  
## gist:7d632e87b3af27a4952561122398a8d1
Convention: Byte array notation as it would appear in a hexeditor.

= Layout=

KDBX files, the keepass database files, are layout as follows:

1) Bytes 0-3: Primary identifier, common across all kdbx versions:
  private static $sigByte1=[0x03,0xD9,0xA2,0x9A];

2) Bytes 4-7: Secondary identifier. Byte 4 can be used to identify the file version (0x67 is latest, 0x66 is the KeePass 2 pre-release format and 0x55 is KeePass 1)
	Convention: Byte array notation as it would appear in a hexeditor.

	= Layout=

	KDBX files, the keepass database files, are layout as follows:

	1) Bytes 0-3: Primary identifier, common across all kdbx versions:
	private static $sigByte1=[0x03,0xD9,0xA2,0x9A];

	2) Bytes 4-7: Secondary identifier. Byte 4 can be used to identify the file version (0x67 is latest, 0x66 is the KeePass 2 pre-release format and 0x55 is KeePass 1)