Shell script for calculating Sec-WebSocket-Accept from Sec-WebSocket-Key

calcswsa.sh

#!/bin/sh

_calcswsa()
{
	echo -n "$1"'258EAFA5-E914-47DA-95CA-C5AB0DC85B11' | sha1sum | awk '{print$1}' | xxd -r -p | base64
}

if [ -t 0 -a -z "$1" ]; then
	echo "usage: $0 [-] [SEC_WEBSOCKET_KEY]..."
	echo
	echo "For each given Sec-WebSocket-Key (provided on the standard input or as a command-line argument; in that order) returns Sec-WebSocket-Accept in a new line."
fi

if [ "$1" = "-" -o ! -t 0 ]; then
	while read -r LINE; do
		for KEY in $LINE; do
			_calcswsa "$KEY"
		done
	done
	if [ "$1" = "-" ]; then
		shift
	fi
fi

while [ -n "$1" ]; do
	_calcswsa "$1"
	shift
done