Fixed

- incorrect result when first bit is 1 of bytes.

Changed
- throw error by Error oject. #13

Added
- TypeScript interfaces. #12

src/sha256.js

@@ -1,7 +1,7 @@
 /**
  * [js-sha256]{@link https://github.com/emn178/js-sha256}
  *
- * @version 0.8.0
+ * @version 0.9.0
  * @author Chen, Yi-Cyuan [emn178@gmail.com]
  * @copyright Chen, Yi-Cyuan 2014-2017
  * @license MIT
@@ -257,7 +257,7 @@
         blocks[8] = blocks[9] = blocks[10] = blocks[11] =
         blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
     }
-    blocks[14] = this.hBytes << 3 | this.bytes >> 29;
+    blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
     blocks[15] = this.bytes << 3;
     this.hash();
   };