feat: skip nextTick in nodeify (#103)

package.json

@@ -35,14 +35,13 @@
     "browserify-aes": "^1.0.6",
     "keypair": "^1.0.1",
     "libp2p-crypto-secp256k1": "~0.2.1",
-    "nodeify": "^1.0.1",
+    "multihashing-async": "~0.4.6",
     "pem-jwk": "^1.5.1",
     "protocol-buffers": "^3.2.1",
     "rsa-pem-to-jwk": "^1.1.3",
     "safe-buffer": "^5.1.1",
     "tweetnacl": "^1.0.0",
-    "webcrypto-shim": "github:dignifiedquire/webcrypto-shim#master",
-    "multihashing-async": "~0.4.6"
+    "webcrypto-shim": "github:dignifiedquire/webcrypto-shim#master"
   },
   "devDependencies": {
     "aegir": "^11.0.2",
@@ -79,4 +78,4 @@
     "greenkeeper[bot] <greenkeeper[bot]@users.noreply.github.com>",
     "nikuda <[email protected]>"
   ]
-}
+}

src/hmac/index-browser.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const nodeify = require('nodeify')
+const nodeify = require('../nodeify')
 const Buffer = require('safe-buffer').Buffer
 
 const crypto = require('../webcrypto.js')()
@@ -12,6 +12,11 @@ const hashTypes = {
   SHA512: 'SHA-512'
 }
 
+const sign = (key, data, cb) => {
+  nodeify(crypto.subtle.sign({name: 'HMAC'}, key, data)
+    .then((raw) => Buffer.from(raw)), cb)
+}
+
 exports.create = function (hashType, secret, callback) {
   const hash = hashTypes[hashType]
 
@@ -27,8 +32,7 @@ exports.create = function (hashType, secret, callback) {
   ).then((key) => {
     return {
       digest (data, cb) {
-        nodeify(crypto.subtle.sign({name: 'HMAC'}, key, data)
-          .then((raw) => Buffer.from(raw)), cb)
+        sign(key, data, cb)
       },
       length: lengths[hashType]
     }

src/keys/ecdh-browser.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const webcrypto = require('../webcrypto.js')()
-const nodeify = require('nodeify')
+const nodeify = require('../nodeify')
 const BN = require('asn1.js').bignum
 const Buffer = require('safe-buffer').Buffer
 

src/keys/rsa-browser.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const nodeify = require('nodeify')
+const nodeify = require('../nodeify')
 const Buffer = require('safe-buffer').Buffer
 
 const webcrypto = require('../webcrypto.js')()

src/nodeify.js

@@ -0,0 +1,11 @@
+'use strict'
+
+// Based on npmjs.com/nodeify but without additional `nextTick` calls
+// to keep the overhead low
+module.exports = function nodeify (promise, cb) {
+  return promise.then((res) => {
+    cb(null, res)
+  }, (err) => {
+    cb(err)
+  })
+}