Implement sha512-256 and sha512-224

Author: ChALkeR

index.js

@@ -13,3 +13,5 @@ exports.sha224 = require('./sha224')
 exports.sha256 = require('./sha256')
 exports.sha384 = require('./sha384')
 exports.sha512 = require('./sha512')
+exports['sha512-224'] = require('./sha512-224')
+exports['sha512-256'] = require('./sha512-256')

sha512-224.js

@@ -0,0 +1,53 @@
+var inherits = require('inherits')
+var Sha512 = require('./sha512')
+var Hash = require('./hash')
+var Buffer = require('safe-buffer').Buffer
+
+var W = new Array(160)
+
+function Sha512h256 () {
+  this.init()
+  this._w = W
+
+  Hash.call(this, 128, 112)
+}
+
+inherits(Sha512h256, Sha512)
+
+Sha512h256.prototype.init = function () {
+  this._ah = 0x8c3d37c8
+  this._bh = 0x73e19966
+  this._ch = 0x1dfab7ae
+  this._dh = 0x679dd514
+  this._eh = 0x0f6d2b69
+  this._fh = 0x77e36f73
+  this._gh = 0x3f9d85a8
+  this._hh = 0x1112e6ad
+
+  this._al = 0x19544da2
+  this._bl = 0x89dcd4d6
+  this._cl = 0x32ff9c82
+  this._dl = 0x582f9fcf
+  this._el = 0x7bd44da8
+  this._fl = 0x04c48942
+  this._gl = 0x6a1d36c8
+  this._hl = 0x91d692a1
+
+  return this
+}
+
+Sha512h256.prototype._hash = function () {
+  var H = Buffer.allocUnsafe(28)
+
+  H.writeInt32BE(this._ah, 0)
+  H.writeInt32BE(this._al, 4)
+  H.writeInt32BE(this._bh, 8)
+  H.writeInt32BE(this._bl, 12)
+  H.writeInt32BE(this._ch, 16)
+  H.writeInt32BE(this._cl, 20)
+  H.writeInt32BE(this._dh, 24)
+
+  return H
+}
+
+module.exports = Sha512h256

sha512-256.js

@@ -0,0 +1,54 @@
+var inherits = require('inherits')
+var Sha512 = require('./sha512')
+var Hash = require('./hash')
+var Buffer = require('safe-buffer').Buffer
+
+var W = new Array(160)
+
+function Sha512h256 () {
+  this.init()
+  this._w = W
+
+  Hash.call(this, 128, 112)
+}
+
+inherits(Sha512h256, Sha512)
+
+Sha512h256.prototype.init = function () {
+  this._ah = 0x22312194
+  this._bh = 0x9f555fa3
+  this._ch = 0x2393b86b
+  this._dh = 0x96387719
+  this._eh = 0x96283ee2
+  this._fh = 0xbe5e1e25
+  this._gh = 0x2b0199fc
+  this._hh = 0x0eb72ddc
+
+  this._al = 0xfc2bf72c
+  this._bl = 0xc84c64c2
+  this._cl = 0x6f53b151
+  this._dl = 0x5940eabd
+  this._el = 0xa88effe3
+  this._fl = 0x53863992
+  this._gl = 0x2c85b8aa
+  this._hl = 0x81c52ca2
+
+  return this
+}
+
+Sha512h256.prototype._hash = function () {
+  var H = Buffer.allocUnsafe(32)
+
+  H.writeInt32BE(this._ah, 0)
+  H.writeInt32BE(this._al, 4)
+  H.writeInt32BE(this._bh, 8)
+  H.writeInt32BE(this._bl, 12)
+  H.writeInt32BE(this._ch, 16)
+  H.writeInt32BE(this._cl, 20)
+  H.writeInt32BE(this._dh, 24)
+  H.writeInt32BE(this._dl, 28)
+
+  return H
+}
+
+module.exports = Sha512h256