Tiny sha1 implementation in javascript

sha1.js

function sha1(r) {
    var o, e, t, f, n, a = [], c = [e = 1732584193, t = 4023233417, ~e, ~t, 3285377520],
        u = [], d = decodeURI(encodeURI(r)) + "€", g = d.length;
    for (u[r = --g / 4 + 2 | 15] = 8 * g; ~g;) u[g >> 2] |= d.charCodeAt(g) << 8 * ~g--;
    for (o = g = 0; o < r; o += 16) {
        for (e = c; g < 80; e = [e[4] + (a[g] = g < 16 ? ~~u[o + g] : 2 * d | d < 0) + 1518500249 + [t & f | ~t & n, d = 341275144 + (t ^ f ^ n), 882459459 + (t & f | t & n | f & n), d + 1535694389][g++ / 5 >> 2] + ((d = e[0]) << 5 | d >>> 27), d, t << 30 | t >>> 2, f, n]) d = a[g - 3] ^ a[g - 8] ^ a[g - 14] ^ a[g - 16], t = e[1], f = e[2], n = e[3];
        for (g = 5; g;) c[--g] += e[g];
    }
    for (d = ""; g < 40;) d += (c[g >> 3] >> 4 * (7 - g++) & 15).toString(16);
    return d;
}