#------------------------------------------------------------------------------
# $File: crypto,v 1.4 2023/07/17 16:41:48 christos Exp $
# crypto:  file(1) magic for crypto formats
#
# Bitcoin block files
0		lelong			0xD9B4BEF9	Bitcoin
>(4.l+40)	lelong			0xD9B4BEF9	reverse block
>>4		lelong			x		\b, size %u
# normal block below
>0		default			x		block
>>4		lelong			x		\b, size %u
>>8		lelong&0xE0000000	0x20000000
>>>8		lelong			x		\b, BIP9 0x%x
>>8		lelong&0xE0000000	!0x20000000
>>>8		lelong			x		\b, version 0x%x
>>76		ledate			x		\b, %s UTC
# VarInt counter
>>88		ubyte			<0xfd		\b, txcount %u
>>88		ubyte			0xfd
>>>89		leshort			x		\b, txcount %u
>>88		ubyte			0xfe
>>>89		lelong			x		\b, txcount %u
>>88		ubyte			0xff
>>>89		lequad			x		\b, txcount %llu
!:ext	dat
# option to find more blocks in the file
#>>(4.l+8)	indirect	x			;

# LevelDB
-8		lequad		0xdb4775248b80fb57	LevelDB table data

# http://www.tarsnap.com/scrypt.html
# see scryptenc_setup() in lib/scryptenc/scryptenc.c
0	string		scrypt\0	scrypt encrypted file
>7	byte		x		\b, N=2**%d
>8	belong		x		\b, r=%d
>12	belong		x		\b, p=%d

# https://age-encryption.org/
# Only the first recipient is printed in detail to prevent repetitive output
# in extreme cases ("ssh-rsa, ssh-rsa, ssh-rsa, ...").
0	string		age-encryption.org/v1\n age encrypted file
>25	regex/128	\^[^\040]+	\b, %s recipient
>>25	string		scrypt
>>>&0 regex/64		[0-9]+\$	(N=2**%s)
>>&0	search/256	\n->\040 	\b, among others

0	string		-----BEGIN\040AGE\040ENCRYPTED\040FILE-----	age encrypted file, ASCII armored