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+# SparkMD5
+
+SparkMD5 is a fast md5 implementation of the MD5 algorithm.
+This script is based in the JKM md5 library which is the [fastest](http://jsperf.com/md5-shootout/7) algorithm around. This is most suitable for browser usage, because `nodejs` version might be faster.
+
+NOTE: Please disable Firebug while performing the test!
+      Firebug consumes a lot of memory and CPU and slows the test by a great margin.
+
+
+**[Demo](http://9px.ir/demo/incremental-md5.html)**
+
+## Install
+
+```sh
+npm install --save spark-md5
+```
+
+## Improvements over the JKM md5 library
+
+ * Strings are converted to utf8, like most server side algorithms
+ * Fix computation for large amounts of data (overflow)
+ * Incremental md5 (see below)
+ * Support for array buffers (typed arrays)
+ * Functionality wrapped in a closure, to avoid global assignments
+ * Object oriented library
+ * CommonJS (it can be used in node) and AMD integration
+ * Code passed through JSHint and JSCS
+
+
+Incremental md5 performs a lot better for hashing large amounts of data, such as
+files. One could read files in chunks, using the FileReader & Blob's, and append
+each chunk for md5 hashing while keeping memory usage low. See example below.
+
+
+## Usage
+
+### Normal usage
+
+```js
+var hexHash = SparkMD5.hash('Hi there');        // hex hash
+var rawHash = SparkMD5.hash('Hi there', true);  // OR raw hash (binary string)
+```
+
+### Incremental usage
+
+```js
+var spark = new SparkMD5();
+spark.append('Hi');
+spark.append(' there');
+var hexHash = spark.end();                      // hex hash
+var rawHash = spark.end(true);                  // OR raw hash (binary string)
+```
+
+### Hash a file incrementally
+
+NOTE: If you test the code bellow using the file:// protocol in chrome you must start the browser with -allow-file-access-from-files argument.
+      Please see: http://code.google.com/p/chromium/issues/detail?id=60889
+
+```js
+document.getElementById('file').addEventListener('change', function () {
+    var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice,
+        file = this.files[0],
+        chunkSize = 2097152,                             // Read in chunks of 2MB
+        chunks = Math.ceil(file.size / chunkSize),
+        currentChunk = 0,
+        spark = new SparkMD5.ArrayBuffer(),
+        fileReader = new FileReader();
+
+    fileReader.onload = function (e) {
+        console.log('read chunk nr', currentChunk + 1, 'of', chunks);
+        spark.append(e.target.result);                   // Append array buffer
+        currentChunk++;
+
+        if (currentChunk < chunks) {
+            loadNext();
+        } else {
+            console.log('finished loading');
+            console.info('computed hash', spark.end());  // Compute hash
+        }
+    };
+
+    fileReader.onerror = function () {
+        console.warn('oops, something went wrong.');
+    };
+
+    function loadNext() {
+        var start = currentChunk * chunkSize,
+            end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize;
+
+        fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
+    }
+
+    loadNext();
+});
+```
+
+You can see some more examples in the test folder.
+
+## Documentation
+
+
+### SparkMD5 class
+
+#### SparkMD5#append(str)
+
+Appends a string, encoding it to UTF8 if necessary.
+
+#### SparkMD5#appendBinary(str)
+
+Appends a binary string (e.g.: string returned from the deprecated [readAsBinaryString](https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsBinaryString)).
+
+#### SparkMD5#end(raw)
+
+Finishes the computation of the md5, returning the hex result.
+If `raw` is true, the result as a binary string will be returned instead.
+
+#### SparkMD5#reset()
+
+Resets the internal state of the computation.
+
+#### SparkMD5#getState()
+
+Returns an object representing the internal computation state.
+You can pass this state to setState(). This feature is useful to resume an incremental md5.
+
+#### SparkMD5#setState(state)
+
+Sets the internal computation state. See: getState().
+
+#### SparkMD5#destroy()
+
+Releases memory used by the incremental buffer and other additional resources.
+
+#### SparkMD5.hash(str, raw)
+
+Hashes a string directly, returning the hex result.
+If `raw` is true, the result as a binary string will be returned instead.
+Note that this function is `static`.
+
+#### SparkMD5.hashBinary(str, raw)
+
+Hashes a binary string directly (e.g.: string returned from the deprecated [readAsBinaryString](https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsBinaryString)), returning the hex result.
+If `raw` is true, the result as a binary string will be returned instead.
+Note that this function is `static`.
+
+
+### SparkMD5.ArrayBuffer class
+
+#### SparkMD5.ArrayBuffer#append(arr)
+
+Appends an array buffer.
+
+#### SparkMD5.ArrayBuffer#end(raw)
+
+Finishes the computation of the md5, returning the hex result.
+If `raw` is true, the result as a binary string will be returned instead.
+
+#### SparkMD5.ArrayBuffer#reset()
+
+Resets the internal state of the computation.
+
+#### SparkMD5.ArrayBuffer#destroy()
+
+Releases memory used by the incremental buffer and other additional resources.
+
+#### SparkMD5.ArrayBuffer#getState()
+
+Returns an object representing the internal computation state.
+You can pass this state to setState(). This feature is useful to resume an incremental md5.
+
+#### SparkMD5.ArrayBuffer#setState(state)
+
+Sets the internal computation state. See: getState().
+
+#### SparkMD5.ArrayBuffer.hash(arr, raw)
+
+Hashes an array buffer directly, returning the hex result.
+If `raw` is true, the result as a binary string will be returned instead.
+Note that this function is `static`.
+
+
+## License
+
+The project is double licensed, being [WTF2](./LICENSE) the master license and [MIT](./LICENSE2) the alternative license.
+The reason to have two licenses is that some entities refuse to use the master license (WTF2) due to
+bad language. If that's also your case, you can choose the alternative license.
+
+
+## Credits
+
+[Joseph Myers](http://www.myersdaily.org/joseph/javascript/md5-text.html)