crypt.hex.sh

# Copyright 2015-2023 Rivoreo

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.


get_encrypted_byte_count() {
	value="`wc -c < \"$1\" 2> /dev/null`" || return
	value=$((value/2))
}

_encrypt_history() {
	{
		unset LC_ALL
		export LC_CTYPE=C
		export LANG=C
		IFS=
		while read -r -n 1 c; do case "$c" in
			"")
				echo 0a
				;;
			*)
				printf %02x\\n "'$c"
				;;
		esac done
	} | xtea_ctr_crypt "$1" %02x $2 $3
}

_decrypt_history() {
	while read -r -n 2 n; do printf %s\\n "$n"; done | xtea_ctr_crypt "$1" %03o\\n 0 | while read -r n; do printf "\\$n"; done
}