Streamable SHA hashes in pure javascript

 This module implements a fast and memory efficient (in place)
 SHA familly hash function in pure javascript.
 .
 SHA function are cryptographic hashs function designed by
 the United States National Security Agency and is a
 U.S. Federal Information Processing Standard published
 by the United States NIST. SHA-1 produces a 160-bit (20-byte)
 hash value known as a message digest.
 .
 This module implements: sha, sha1, sha256, sha512.
 .
 Node.js is an event-based server-side JavaScript engine.