__init__.py

from CTFd import utils
from flask import render_template
from CTFd.plugins import (
	register_user_page_menu_bar,
	register_plugin_assets_directory
)

def load(app):
	#https://github.com/blueimp/JavaScript-MD5/
	#https://github.com/Caligatio/jsSHA
	#https://github.com/beatgammit/base64-js/
	register_plugin_assets_directory(app, base_path='/plugins/CTFd-hasher/assets/')

	#abc - only works on modified server.
	#register_user_page_menu_bar(name='Hasher', route='/CTFd-hasher', target='_blank')
	register_user_page_menu_bar(name='Hasher', route='/CTFd-hasher')

	@app.route('/CTFd-hasher', methods=['GET'])
	def hash():
		return render_template('page.html', content="""
<script src='/themes/original/static/js/vendor/jquery.min.js' type='text/javascript'></script>
<script src='/plugins/CTFd-hasher/assets/md5.min.js' type='text/javascript'></script>
<script src='/plugins/CTFd-hasher/assets/base64js.min.js' type='text/javascript'></script>
<script src='/plugins/CTFd-hasher/assets/sha.js' type='text/javascript'></script>
<h1>Hash a value</h1>
<input id='valuetohash' style='width: 80%;'></input>&nbsp;
<button id='hash'>go</button><br/><br/>
<textarea id='output' style='width: 80%;'></textarea>&nbsp;
<button id='copy' style='position:relative; top: -8px;'>copy</button>
<script>
    $(function() {
        $('#hash').click( function()
            {
                var val = $('#valuetohash').val().trim();
                //var hash = md5(val);
                var shaObj = new jsSHA('SHA-256', 'TEXT');
                shaObj.update(val);
                var hash = shaObj.getHash('B64');
                $('#output').html(hash);
            }
        );

        $('#copy').click( function()
            {
                var $temp = $('<input>');
                $('body').append($temp);
                $temp.val($('#output').text()).select();
                document.execCommand('copy');
                $temp.remove();
            }
        );
    });
</script>
""")

	utils.hasher = hash