hash-base - npm Package Compare versions

Comparing version 1.0.2 to 2.0.0

index.js

@@ -5,5 +5,11 @@ 'use strict'
 
-function HashBase () {
+function HashBase (blockSize) {
   Transform.call(this)
-  this.initialised_ = true
+
+  this._block = new Buffer(blockSize)
+  this._blockSize = blockSize
+  this._blockOffset = 0
+  this._length = [0, 0, 0, 0]
+
+  this._finalized = false
 }
@@ -13,12 +19,25 @@
 
-HashBase.DEFAULT_ENCODING = 'buffer'
+HashBase.prototype.update = function (data, encoding) {
+  if (this._finalized) throw new Error('Digest already called')
+  if (!Buffer.isBuffer(data)) data = new Buffer(data, encoding || 'binary')
 
-HashBase.prototype.update = function (data, encoding) {
-  if (!Buffer.isBuffer(data)) {
-    if (encoding === undefined) encoding = HashBase.DEFAULT_ENCODING
-    if (encoding === 'buffer') encoding = 'binary'
-    data = new Buffer(data, encoding)
+  // consume data
+  var offset = 0
+  while (this._blockOffset + data.length - offset >= this._blockSize) {
+    for (var i = this._blockOffset; i < this._blockSize;) this._block[i++] = data[offset++]
+    this._update()
+    this._blockOffset = 0
   }
 
-  this._update(data)
+  while (offset < data.length) {
+    this._block[this._blockOffset++] = data[offset++]
+  }
+
+  // update length
+  for (var j = 0, carry = data.length * 8; carry > 0; ++j) {
+    this._length[j] += carry
+    carry = Math.floor(this._length[j] / 0x0100000000)
+    if (carry > 0) this._length[j] -= 0x0100000000 * carry
+  }
+
   return this
@@ -28,8 +47,7 @@ }
 HashBase.prototype.digest = function (encoding) {
-  if (!this.initialised_) throw new Error('Not initialized')
-  this.initialised_ = false
+  if (this._finalized) throw new Error('Digest already called')
+  this._finalized = true
 
   var digest = this._digest()
-  if (encoding === undefined) encoding = HashBase.DEFAULT_ENCODING
-  if (encoding !== 'buffer') digest = digest.toString(encoding)
+  if (encoding !== undefined) digest = digest.toString(encoding)
   return digest
@@ -50,3 +68,3 @@ }
     if (encoding !== 'buffer') chunk = new Buffer(chunk, encoding)
-    this._update(chunk)
+    this.update(chunk)
   } catch (err) {
@@ -53,0 +71,0 @@ error = err

package.json

 {
   "name": "hash-base",
-  "version": "1.0.2",
+  "version": "2.0.0",
   "description": "abstract base class for hash-streams",
@@ -5,0 +5,0 @@ "keywords": [

README.md

@@ -11,8 +11,21 @@ # hash-base
 
-Requires you to implement 2 methods:
+## Example
 
-  - `_update(data)` takes a buffer and should return nothing
+```js
+function MyHash () {
+  HashBase.call(64) // in bytes
+}
 
-  - `_digest()` takes no arguments and should return a buffer
+inherti(MyHash, HashBase)
 
+MyHash.prototype._update = function () {
+  // hashing one block with buffer this._block
+}
+
+MyHash.prototype._digest = function () {
+  // create padding and produce result
+}
+```
+You also can check [source code](index.js) or [crypto-browserify/md5.js][5]
+
 ## LICENSE
@@ -26,1 +39,2 @@
 [4]: https://github.com/crypto-browserify/cipher-base
+[5]: https://github.com/crypto-browserify/md5.js

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Improved metrics

Total package byte prevSize

4294

increased by21.57%

Lines of code

66

increased by26.92%

Number of lines in readme file

39

increased by56%

No dependency changes