/usr/share/javascript/jsxc/lib/dsa-ww.js is in libjs-jsxc 1.0.0~dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(function(root) {
    "use strict";
    root.OTR = {}
    root.crypto = {}
    root.DSA = {};
    // default imports
    var imports = [
        'build/dep/salsa20.js',
        'build/dep/bigint.js',
        'build/dep/crypto.js',
        'build/dep/eventemitter.js',
        'lib/const.js',
        'lib/helpers.js',
        'lib/dsa.js',
    ]
    function sendMsg(type, data) {
        postMessage({
            type: type,
            data: data,
        })
    }
    self.onmessage = function(e) {
        var data = e.data;
        root.crypto = {
            getRandomValues: function() {
                var buf = data.random;
            }
        };
        if (data.imports)
            imports = data.imports
        importScripts.apply(self, imports);
        sendMsg('debug', 'DSA key creation started')
        var dsa = new DSA()
        sendMsg('debug', 'DSA key creation finished')
        sendMsg('data', {key: dsa.packPrivate()})
    }
}(this))
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