sha0: add implementation

Author: knjcode

index.js

@@ -5,6 +5,7 @@ var exports = module.exports = function (alg) {
 }
 
 
+exports.sha = require('./sha')
 exports.sha1 = require('./sha1')
 exports.sha224 = require('./sha224')
 exports.sha256 = require('./sha256')

sha.js

@@ -0,0 +1,99 @@
+/*
+ * A JavaScript implementation of the Secure Hash Algorithm, SHA-0, as defined
+ * in FIPS PUB 180-1
+ * This source code is derived from sha1.js of the same repository.
+ * The difference between SHA-0 and SHA-1 is just a bitwise rotate left
+ * operation was added.
+ */
+
+var inherits = require('inherits')
+var Hash = require('./hash')
+
+var W = new Array(80)
+
+function Sha() {
+  this.init()
+  this._w = W
+
+  Hash.call(this, 64, 56)
+}
+
+inherits(Sha, Hash)
+
+Sha.prototype.init = function () {
+  this._a = 0x67452301
+  this._b = 0xefcdab89
+  this._c = 0x98badcfe
+  this._d = 0x10325476
+  this._e = 0xc3d2e1f0
+
+  return this
+}
+
+/*
+ * Bitwise rotate a 32-bit number to the left.
+ */
+function rol(num, cnt) {
+  return (num << cnt) | (num >>> (32 - cnt));
+}
+
+Sha.prototype._update = function (M) {
+  var W = this._w
+
+  var a = this._a
+  var b = this._b
+  var c = this._c
+  var d = this._d
+  var e = this._e
+
+  var j = 0, k
+
+  /*
+   * SHA-1 has a bitwise rotate left operation. But, SHA is not
+   * function calcW() { return rol(W[j - 3] ^ W[j -  8] ^ W[j - 14] ^ W[j - 16], 1) }
+   */
+  function calcW() { return W[j - 3] ^ W[j -  8] ^ W[j - 14] ^ W[j - 16] }
+  function loop(w, f) {
+    W[j] = w
+
+    var t = rol(a, 5) + f + e + w + k
+
+    e = d
+    d = c
+    c = rol(b, 30)
+    b = a
+    a = t
+    j++
+  }
+
+  k = 1518500249
+  while (j < 16) loop(M.readInt32BE(j * 4), (b & c) | ((~b) & d))
+  while (j < 20) loop(calcW(), (b & c) | ((~b) & d))
+  k = 1859775393
+  while (j < 40) loop(calcW(), b ^ c ^ d)
+  k = -1894007588
+  while (j < 60) loop(calcW(), (b & c) | (b & d) | (c & d))
+  k = -899497514
+  while (j < 80) loop(calcW(), b ^ c ^ d)
+
+  this._a = (a + this._a) | 0
+  this._b = (b + this._b) | 0
+  this._c = (c + this._c) | 0
+  this._d = (d + this._d) | 0
+  this._e = (e + this._e) | 0
+}
+
+Sha.prototype._hash = function () {
+  var H = new Buffer(20)
+
+  H.writeInt32BE(this._a|0, 0)
+  H.writeInt32BE(this._b|0, 4)
+  H.writeInt32BE(this._c|0, 8)
+  H.writeInt32BE(this._d|0, 12)
+  H.writeInt32BE(this._e|0, 16)
+
+  return H
+}
+
+module.exports = Sha
+

test/vectors.js

@@ -65,6 +65,7 @@ if(process.argv[2])
   makeTest(process.argv[2], parseInt(process.argv[3]), true)
 else
   vectors.forEach(function (v, i) {
+    makeTest('sha', i)
     makeTest('sha1', i)
     makeTest('sha224', i)
     makeTest('sha256', i)