diff --git a/crypto_generichash.js b/crypto_generichash.js
new file mode 100644
index 0000000..2c3bf89
--- /dev/null
+++ b/crypto_generichash.js
@@ -0,0 +1,27 @@
+var assert = require('assert')
+var blake2b = require('blake2b')
+
+module.exports.crypto_generichash_PRIMITIVE = 'blake2b'
+module.exports.crypto_generichash_BYTES_MIN = blake2b.BYTES_MIN
+module.exports.crypto_generichash_BYTES_MAX = blake2b.BYTES_MAX
+module.exports.crypto_generichash_BYTES = blake2b.BYTES
+module.exports.crypto_generichash_KEYBYTES_MIN = blake2b.KEYBYTES_MIN
+module.exports.crypto_generichash_KEYBYTES_MAX = blake2b.KEYBYTES_MAX
+module.exports.crypto_generichash_KEYBYTES = blake2b.KEYBYTES
+
+module.exports.crypto_generichash = function (output, input, key) {
+  blake2b(output, input, key)
+}
+
+module.exports.crypto_generichash_batch = function (output, inputArray, key) {
+  var ctx = blake2b.instance(output.length, key)
+  for (var i = 0; i < inputArray.length; i++) {
+    ctx.update(inputArray[i])
+  }
+  ctx.final(output)
+}
+
+module.exports.crypto_generichash_instance = function (key, outlen) {
+  if (outlen == null) outlen = module.exports.crypto_generichash_BYTES
+  return blake2b.instance(outlen, key)
+}
diff --git a/index.js b/index.js
index 8cc07dc..c9189fe 100644
--- a/index.js
+++ b/index.js
@@ -2162,21 +2162,6 @@ function crypto_secretbox_open_easy(msg, box, n, k) {
   return true
 }
 
-var blake2b = require('blakejs/blake2b')
-
-function crypto_generichash (out, data, key) {
-  var tmp = blake2b.blake2b(data, key, out.length)
-  for (var i = 0; i < tmp.length; i++) out[i] = tmp[i]
-}
-
-function crypto_generichash_batch (out, batch, key) {
-  var i = 0
-  var ctx = blake2b.blake2bInit(out.length, key)
-  for (i = 0; i < batch.length; i++) blake2b.blake2bUpdate(ctx, batch[i])
-  var tmp = blake2b.blake2bFinal(ctx)
-  for (var i = 0; i < tmp.length; i++) out[i] = tmp[i]
-}
-
 var crypto_secretbox_KEYBYTES = 32,
     crypto_secretbox_NONCEBYTES = 24,
     crypto_secretbox_ZEROBYTES = 32,
@@ -2208,6 +2193,8 @@ sodium.crypto_sign_open = crypto_sign_open
 sodium.crypto_sign_detached = crypto_sign_detached
 sodium.crypto_sign_verify_detached = crypto_sign_verify_detached
 
+forward(require('./crypto_generichash'))
+
 sodium.crypto_stream_KEYBYTES = 32
 sodium.crypto_stream_NONCEBYTES = 24
 sodium.crypto_stream = crypto_stream_wrap
@@ -2224,15 +2211,6 @@ sodium.crypto_secretbox_MACBYTES = 16
 sodium.crypto_secretbox_easy = crypto_secretbox_easy
 sodium.crypto_secretbox_open_easy = crypto_secretbox_open_easy
 
-sodium.crypto_generichash_BYTES_MIN = 16
-sodium.crypto_generichash_BYTES_MAX = 64
-sodium.crypto_generichash_BYTES = 32
-sodium.crypto_generichash_KEYBYTES_MIN = 16
-sodium.crypto_generichash_KEYBYTES_MAX = 64
-sodium.crypto_generichash_KEYBYTES = 32
-sodium.crypto_generichash = crypto_generichash
-sodium.crypto_generichash_batch = crypto_generichash_batch
-
 function cleanup(arr) {
   for (var i = 0; i < arr.length; i++) arr[i] = 0;
 }
@@ -2241,6 +2219,12 @@ function check (buf, len) {
   if (!buf || (len && buf.length < len)) throw new Error('Argument must be a buffer' + (len ? ' of length ' + len : ''))
 }
 
+function forward (submodule) {
+  Object.keys(submodule).forEach(function (prop) {
+    module.exports[prop] = submodule[prop]
+  })
+}
+
 (function() {
   // Initialize PRNG if environment provides CSPRNG.
   // If not, methods calling randombytes will throw.
diff --git a/package.json b/package.json
index 15fa6a4..e90ef6e 100644
--- a/package.json
+++ b/package.json
@@ -4,10 +4,10 @@
   "description": "WIP - a pure javascript version of sodium-native",
   "main": "index.js",
   "dependencies": {
-    "blakejs": "^1.0.1"
+    "blake2b": "^1.2.0"
   },
   "devDependencies": {
-    "sodium-test": "^0.1.0"
+    "sodium-test": "^0.2.0"
   },
   "repository": {
     "type": "git",