lib-typedarrays.js

(function () {
    // Check if typed arrays are supported
    if (typeof ArrayBuffer != 'function') {
        return;
    }

    // Shortcuts
    var C = CryptoJS;
    var C_lib = C.lib;
    var WordArray = C_lib.WordArray;

    // Reference original init
    var superInit = WordArray.init;

    // Augment WordArray.init to handle typed arrays
    var subInit = WordArray.init = function (typedArray) {
        // Convert buffers to uint8
        if (typedArray instanceof ArrayBuffer) {
            typedArray = new Uint8Array(typedArray);
        }

        // Convert other array views to uint8
        if (
            typedArray instanceof Int8Array ||
            (typeof Uint8ClampedArray !== "undefined" && typedArray instanceof Uint8ClampedArray) ||
            typedArray instanceof Int16Array ||
            typedArray instanceof Uint16Array ||
            typedArray instanceof Int32Array ||
            typedArray instanceof Uint32Array ||
            typedArray instanceof Float32Array ||
            typedArray instanceof Float64Array
        ) {
            typedArray = new Uint8Array(typedArray.buffer, typedArray.byteOffset, typedArray.byteLength);
        }

        // Handle Uint8Array
        if (typedArray instanceof Uint8Array) {
            // Shortcut
            var typedArrayByteLength = typedArray.byteLength;

            // Extract bytes
            var words = [];
            for (var i = 0; i < typedArrayByteLength; i++) {
                words[i >>> 2] |= typedArray[i] << (24 - (i % 4) * 8);
            }

            // Initialize this word array
            superInit.call(this, words, typedArrayByteLength);
        } else {
            // Else call normal init
            superInit.apply(this, arguments);
        }
    };

    subInit.prototype = WordArray;
}());