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switch to class #72

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113 changes: 57 additions & 56 deletions sha.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,6 @@
* operation was added.
*/

var inherits = require('inherits')
var Hash = require('./hash')
var Buffer = require('safe-buffer').Buffer

Expand All @@ -16,23 +15,67 @@ var K = [

var W = new Array(80)

function Sha () {
this.init()
this._w = W
class Sha extends Hash {
constructor () {
super(64, 56)

Hash.call(this, 64, 56)
}
this.init()
this._w = W
}

init() {
this._a = 0x67452301
this._b = 0xefcdab89
this._c = 0x98badcfe
this._d = 0x10325476
this._e = 0xc3d2e1f0

return this
}

inherits(Sha, Hash)
_update(M) {
var W = this._w

var a = this._a | 0
var b = this._b | 0
var c = this._c | 0
var d = this._d | 0
var e = this._e | 0

for (var i = 0; i < 16; ++i)
W[i] = M.readInt32BE(i * 4)
for (; i < 80; ++i)
W[i] = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16]

for (var j = 0; j < 80; ++j) {
var s = ~~(j / 20)
var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0

e = d
d = c
c = rotl30(b)
b = a
a = t
}

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
}

_hash() {
var H = Buffer.allocUnsafe(20)

Sha.prototype.init = function () {
this._a = 0x67452301
this._b = 0xefcdab89
this._c = 0x98badcfe
this._d = 0x10325476
this._e = 0xc3d2e1f0
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 this
return H
}
}

function rotl5 (num) {
Expand All @@ -49,46 +92,4 @@ function ft (s, b, c, d) {
return b ^ c ^ d
}

Sha.prototype._update = function (M) {
var W = this._w

var a = this._a | 0
var b = this._b | 0
var c = this._c | 0
var d = this._d | 0
var e = this._e | 0

for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
for (; i < 80; ++i) W[i] = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16]

for (var j = 0; j < 80; ++j) {
var s = ~~(j / 20)
var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0

e = d
d = c
c = rotl30(b)
b = a
a = t
}

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 = Buffer.allocUnsafe(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