lfsr113(PRNG) for javascript.

lfsr113.js

function LFSR113(a, b, c, d) {
    if ((a |= 0) < 1) throw 'a must bigger than 1';
    if ((b |= 0) < 7) throw 'b must bigger than 7';
    if ((c |= 0) < 15) throw 'c must bigger than 15';
    if ((d |= 0) < 127) throw 'd must bigger than 127';
    this.next = function () {
        var e = ((a << 6) ^ a) >> 13;
        a = ((a & 4294967294) << 18) ^ e;
        e  = ((b << 2) ^ b) >> 27;
        b = ((b & 4294967288) << 2) ^ e;
        e  = ((c << 13) ^ c) >> 21;
        c = ((c & 4294967280) << 7) ^ e;
        e  = ((d << 3) ^ d) >> 12;
        d = ((d & 4294967168) << 13) ^ e;
        return (a ^ b ^ c ^ d) * 2.3283064365386963e-10 + 0.5;
    }
}