[File] New magic file for Sydbox encrypted files

[Ali Polatel]

Dear kind people,

I am the developer of Sydbox[1], a sandbox for Linux systems.
It has a mode to encrypt files, below you may find the magic
definition of such encrypted files. Refer to this page[2]
for more information about the format.

--8<--
# Magic file for SYD3 encrypted files
# https://man.exherbolinux.org/syd.7.html#Crypt_Sandboxing

0	string		\177SYD		SYD encrypted file,
>4	byte		x		version %d
!:mime	application/x-syd-encrypted

# Extract and display the 32-byte HMAC.
>5		ubelong		x		\b, HMAC: %08x
>9		ubelong		x		\b%08x
>13		ubelong		x		\b%08x
>17		ubelong		x		\b%08x
>21		ubelong		x		\b%08x
>25		ubelong		x		\b%08x
>29		ubelong		x		\b%08x
>33		ubelong		x		\b%08x

# Extract and display the 16-byte IV.
>37		ubelong		x		\b, IV: %08x
>41		ubelong		x		\b%08x
>45		ubelong		x		\b%08x
>49		ubelong		x		\b%08x

-->8--

[1]: https://sydbox.exherbolinux.org
[2]: https://man.exherbolinux.org/syd.7.html#Crypt_Sandboxing
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