fix: add identity hashing (#53)

* fix: add identity hashing

* fix: ensure that `Uint8Array` instance can be passed

Author: Gozala

package.json

@@ -71,6 +71,7 @@
     "Richard Schneider <[email protected]>",
     "Victor Bjelkholm <[email protected]>",
     "Volker Mische <[email protected]>",
+    "Irakli Gozalishvili <[email protected]>",
     "npm-to-cdn-bot (by Forbes Lindesay) <[email protected]>"
   ]
 }

src/crypto.js

@@ -42,7 +42,10 @@ const hash = (algorithm) => async (data) => {
   }
 }
 
+const identity = data => Buffer.from(data)
+
 module.exports = {
+  identity,
   sha1: sha('sha1'),
   sha2256: sha('sha2-256'),
   sha2512: sha('sha2-512'),

src/index.js

@@ -66,6 +66,8 @@ Multihashing.createHash = function (alg) {
  * @type {Object}
  */
 Multihashing.functions = {
+  // identity
+  0x00: crypto.identity,
   // sha1
   0x11: crypto.sha1,
   // sha2-256

test/fixtures/encodes.js

@@ -1,6 +1,10 @@
 'use strict'
 
 module.exports = [[
+  'beep boop',
+  'identity',
+  '00096265657020626f6f70'
+], [
   'beep boop',
   'sha1',
   '11147c8357577f51d4f0a8d393aa1aaafb28863d9421'

test/index.spec.js

@@ -21,6 +21,13 @@ describe('multihashing', () => {
       const digest = await multihashing(Buffer.from(raw), func)
       expect(digest.toString('hex')).to.eql(encoded)
     })
+
+    it(`encodes Uint8Array in ${func}`, async function () {
+      const buffer = Buffer.from(raw)
+      const bytes = new Uint8Array(buffer, buffer.byteOffset, buffer.byteLength)
+      const digest = await multihashing(bytes, func)
+      expect(digest.toString('hex')).to.eql(encoded)
+    })
   }
 
   it('cuts the length', async () => {