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+
+#------------------------------------------------------------------------------
+# $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