Javascript IOTA Seed Generator

IOTASeedGenerator.js

var GenerateSeed = function () {

    var length       = 81;                            // The length of the seed and int array.
    var chars        = "ABCDEFGHIJKLMNOPQRSTUVWXYZ9"; // The allowed characters in the seed.
    var randomValues = new Uint32Array(length);       // An empty array to store the random values.
    var result       = new Array(length);             // An empty array to store the seed characters.

    window.crypto.getRandomValues(randomValues);      // Generate random values and store them to array.

    var cursor = 0;                                   // A cursor is introduced to remove modulus bias.
    for (var i = 0; i < randomValues.length; i++) {   // Loop through each of the 81 random values.
        cursor += randomValues[i];                    // Add them to the cursor.
        result[i] = chars[cursor % chars.length];     // Assign a new character to the seed based on cursor mod 81.
    }

    return result.join('');                           // Merge the array into a single string and return it.

};

GenerateSeed();