diff --git a/.aegir.js b/.aegir.js
new file mode 100644
index 00000000..7267952d
--- /dev/null
+++ b/.aegir.js
@@ -0,0 +1,17 @@
+"use strict"
+
+module.exports = {
+  // Have not used webpack so just copied proposed setup from
+  // https://babeljs.io/docs/setup/#installation
+  webpack: {
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules/,
+          loader: "babel-loader"
+        }
+      ]
+    }
+  }
+}
diff --git a/.babelrc b/.babelrc
new file mode 100644
index 00000000..0a4cc4b2
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,34 @@
+{
+  "env": {
+    "development": {
+      "sourceMaps": "inline",
+      "comments": false,
+      "presets": [
+        [
+          "env",
+          {
+            "targets": {
+              "node": "current"
+            }
+          }
+        ],
+        "flow-node"
+      ]
+    },
+    "umd": {
+      "comments": false,
+      "presets": [
+        [
+          "env",
+          {
+            "modules": false,
+            "targets": {
+              "browsers": "last 2 versions"
+            }
+          }
+        ],
+        "flow-node"
+      ]
+    }
+  }
+}
diff --git a/.flowconfig b/.flowconfig
new file mode 100644
index 00000000..57c6722d
--- /dev/null
+++ b/.flowconfig
@@ -0,0 +1,9 @@
+[ignore]
+.*/node_modules/documentation/*
+
+[libs]
+
+[include]
+
+[options]
+suppress_comment= \\(.\\|\n\\)*\\@FlowIgnore
diff --git a/.gitignore b/.gitignore
index 68363e01..070f6bd0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,4 @@ node_modules
 
 dist
 docs
+lib
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 00000000..03d9dffe
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,4 @@
+{
+  "editor.formatOnSave": false,
+  "json.format.enable": false
+}
\ No newline at end of file
diff --git a/appveyor.yml b/appveyor.yml
index 046bf910..bc74b9d1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,6 +24,7 @@ install:
   - npm install
 
 test_script:
+  - npm run build:node
   - npm run test:node
 
 build: off
diff --git a/package.json b/package.json
index ed8cb184..18d13334 100644
--- a/package.json
+++ b/package.json
@@ -2,19 +2,30 @@
   "name": "multihashes",
   "version": "0.4.13",
   "description": "multihash implementation",
-  "main": "src/index.js",
+  "main": "lib/index.js",
   "scripts": {
-    "lint": "aegir lint",
+    "lint": "lint-staged && npm run type-check",
     "test:browser": "aegir test --target browser",
     "test:node": "aegir test --target node",
-    "build": "aegir build",
-    "test": "aegir test",
+    "type-check": "flow check",
+    "build": "npm run build:node && BABEL_ENV=umd aegir build",
+    "test": "npm run build:node && aegir test",
     "docs": "aegir docs",
     "release": "aegir release --docs",
     "release-minor": "aegir release --type minor --docs",
     "release-major": "aegir release --type major --docs",
     "coverage": "aegir coverage",
-    "coverage-publish": "aegir coverage --provider coveralls"
+    "coverage-publish": "aegir coverage --provider coveralls",
+    "build:types": "flow-copy-source --verbose src lib",
+    "build:lib": "babel --out-dir lib src",
+    "build:node": "npm run build:types && npm run build:lib",
+    "start": "flow-copy-source --watch --verbose src lib & babel --watch --out-dir lib src"
+  },
+  "lint-staged": {
+    "*.js": [
+      "prettier --no-semi --write",
+      "git add"
+    ]
   },
   "pre-commit": [
     "lint",
@@ -43,10 +54,21 @@
   },
   "devDependencies": {
     "aegir": "^12.3.0",
+    "babel-cli": "6.26.0",
+    "babel-core": "6.26.0",
+    "babel-loader": "7.1.2",
+    "babel-preset-flow-node": "2.0.1",
     "buffer-equal": "1.0.0",
     "chai": "^4.1.2",
     "dirty-chai": "^2.0.1",
-    "pre-commit": "^1.2.2"
+    "flow-bin": "^0.66.0",
+    "flow-copy-source": "^1.2.0",
+    "lint-staged": "^6.0.0",
+    "pre-commit": "^1.2.2",
+    "prettier": "1.10.2",
+    "rollup": "0.56.1",
+    "rollup.config.flow": "1.0.0",
+    "source-map-support": "0.5.3"
   },
   "contributors": [
     "Alan Shaw <alan@tableflip.io>",
diff --git a/src/constants.js b/src/constants.js
index bb088164..011e9cab 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -1,8 +1,10 @@
+/* @flow */
 /* eslint quote-props: off */
 /* eslint key-spacing: off */
 'use strict'
 
-exports.names = Object.freeze({
+
+export const names = Object.freeze({
   'sha1':       0x11,
   'sha2-256':   0x12,
   'sha2-512':   0x13,
@@ -341,684 +343,687 @@ exports.names = Object.freeze({
   'Skein1024-1024': 0xb3e0
 })
 
-exports.codes = Object.freeze({
-  0x11: 'sha1',
-  0x12: 'sha2-256',
-  0x13: 'sha2-512',
-  0x56: 'dbl-sha2-256',
-  0x17: 'sha3-224',
-  0x16: 'sha3-256',
-  0x15: 'sha3-384',
-  0x14: 'sha3-512',
-  0x18: 'shake-128',
-  0x19: 'shake-256',
-  0x1A: 'keccak-224',
-  0x1B: 'keccak-256',
-  0x1C: 'keccak-384',
-  0x1D: 'keccak-512',
-  0x22: 'murmur3-128',
-  0x23: 'murmur3-32',
+export type Name = $Keys<typeof names>
+export type Code = $Values<typeof names>
+
+export const codes:{[Code]:Name} = Object.freeze({
+  [0x11]: 'sha1',
+  [0x12]: 'sha2-256',
+  [0x13]: 'sha2-512',
+  [0x56]: 'dbl-sha2-256',
+  [0x17]: 'sha3-224',
+  [0x16]: 'sha3-256',
+  [0x15]: 'sha3-384',
+  [0x14]: 'sha3-512',
+  [0x18]: 'shake-128',
+  [0x19]: 'shake-256',
+  [0x1A]: 'keccak-224',
+  [0x1B]: 'keccak-256',
+  [0x1C]: 'keccak-384',
+  [0x1D]: 'keccak-512',
+  [0x22]: 'murmur3-128',
+  [0x23]: 'murmur3-32',
 
   // blake2
-  0xb201: 'blake2b-8',
-  0xb202: 'blake2b-16',
-  0xb203: 'blake2b-24',
-  0xb204: 'blake2b-32',
-  0xb205: 'blake2b-40',
-  0xb206: 'blake2b-48',
-  0xb207: 'blake2b-56',
-  0xb208: 'blake2b-64',
-  0xb209: 'blake2b-72',
-  0xb20a: 'blake2b-80',
-  0xb20b: 'blake2b-88',
-  0xb20c: 'blake2b-96',
-  0xb20d: 'blake2b-104',
-  0xb20e: 'blake2b-112',
-  0xb20f: 'blake2b-120',
-  0xb210: 'blake2b-128',
-  0xb211: 'blake2b-136',
-  0xb212: 'blake2b-144',
-  0xb213: 'blake2b-152',
-  0xb214: 'blake2b-160',
-  0xb215: 'blake2b-168',
-  0xb216: 'blake2b-176',
-  0xb217: 'blake2b-184',
-  0xb218: 'blake2b-192',
-  0xb219: 'blake2b-200',
-  0xb21a: 'blake2b-208',
-  0xb21b: 'blake2b-216',
-  0xb21c: 'blake2b-224',
-  0xb21d: 'blake2b-232',
-  0xb21e: 'blake2b-240',
-  0xb21f: 'blake2b-248',
-  0xb220: 'blake2b-256',
-  0xb221: 'blake2b-264',
-  0xb222: 'blake2b-272',
-  0xb223: 'blake2b-280',
-  0xb224: 'blake2b-288',
-  0xb225: 'blake2b-296',
-  0xb226: 'blake2b-304',
-  0xb227: 'blake2b-312',
-  0xb228: 'blake2b-320',
-  0xb229: 'blake2b-328',
-  0xb22a: 'blake2b-336',
-  0xb22b: 'blake2b-344',
-  0xb22c: 'blake2b-352',
-  0xb22d: 'blake2b-360',
-  0xb22e: 'blake2b-368',
-  0xb22f: 'blake2b-376',
-  0xb230: 'blake2b-384',
-  0xb231: 'blake2b-392',
-  0xb232: 'blake2b-400',
-  0xb233: 'blake2b-408',
-  0xb234: 'blake2b-416',
-  0xb235: 'blake2b-424',
-  0xb236: 'blake2b-432',
-  0xb237: 'blake2b-440',
-  0xb238: 'blake2b-448',
-  0xb239: 'blake2b-456',
-  0xb23a: 'blake2b-464',
-  0xb23b: 'blake2b-472',
-  0xb23c: 'blake2b-480',
-  0xb23d: 'blake2b-488',
-  0xb23e: 'blake2b-496',
-  0xb23f: 'blake2b-504',
-  0xb240: 'blake2b-512',
-  0xb241: 'blake2s-8',
-  0xb242: 'blake2s-16',
-  0xb243: 'blake2s-24',
-  0xb244: 'blake2s-32',
-  0xb245: 'blake2s-40',
-  0xb246: 'blake2s-48',
-  0xb247: 'blake2s-56',
-  0xb248: 'blake2s-64',
-  0xb249: 'blake2s-72',
-  0xb24a: 'blake2s-80',
-  0xb24b: 'blake2s-88',
-  0xb24c: 'blake2s-96',
-  0xb24d: 'blake2s-104',
-  0xb24e: 'blake2s-112',
-  0xb24f: 'blake2s-120',
-  0xb250: 'blake2s-128',
-  0xb251: 'blake2s-136',
-  0xb252: 'blake2s-144',
-  0xb253: 'blake2s-152',
-  0xb254: 'blake2s-160',
-  0xb255: 'blake2s-168',
-  0xb256: 'blake2s-176',
-  0xb257: 'blake2s-184',
-  0xb258: 'blake2s-192',
-  0xb259: 'blake2s-200',
-  0xb25a: 'blake2s-208',
-  0xb25b: 'blake2s-216',
-  0xb25c: 'blake2s-224',
-  0xb25d: 'blake2s-232',
-  0xb25e: 'blake2s-240',
-  0xb25f: 'blake2s-248',
-  0xb260: 'blake2s-256',
+  [0xb201]: 'blake2b-8',
+  [0xb202]: 'blake2b-16',
+  [0xb203]: 'blake2b-24',
+  [0xb204]: 'blake2b-32',
+  [0xb205]: 'blake2b-40',
+  [0xb206]: 'blake2b-48',
+  [0xb207]: 'blake2b-56',
+  [0xb208]: 'blake2b-64',
+  [0xb209]: 'blake2b-72',
+  [0xb20a]: 'blake2b-80',
+  [0xb20b]: 'blake2b-88',
+  [0xb20c]: 'blake2b-96',
+  [0xb20d]: 'blake2b-104',
+  [0xb20e]: 'blake2b-112',
+  [0xb20f]: 'blake2b-120',
+  [0xb210]: 'blake2b-128',
+  [0xb211]: 'blake2b-136',
+  [0xb212]: 'blake2b-144',
+  [0xb213]: 'blake2b-152',
+  [0xb214]: 'blake2b-160',
+  [0xb215]: 'blake2b-168',
+  [0xb216]: 'blake2b-176',
+  [0xb217]: 'blake2b-184',
+  [0xb218]: 'blake2b-192',
+  [0xb219]: 'blake2b-200',
+  [0xb21a]: 'blake2b-208',
+  [0xb21b]: 'blake2b-216',
+  [0xb21c]: 'blake2b-224',
+  [0xb21d]: 'blake2b-232',
+  [0xb21e]: 'blake2b-240',
+  [0xb21f]: 'blake2b-248',
+  [0xb220]: 'blake2b-256',
+  [0xb221]: 'blake2b-264',
+  [0xb222]: 'blake2b-272',
+  [0xb223]: 'blake2b-280',
+  [0xb224]: 'blake2b-288',
+  [0xb225]: 'blake2b-296',
+  [0xb226]: 'blake2b-304',
+  [0xb227]: 'blake2b-312',
+  [0xb228]: 'blake2b-320',
+  [0xb229]: 'blake2b-328',
+  [0xb22a]: 'blake2b-336',
+  [0xb22b]: 'blake2b-344',
+  [0xb22c]: 'blake2b-352',
+  [0xb22d]: 'blake2b-360',
+  [0xb22e]: 'blake2b-368',
+  [0xb22f]: 'blake2b-376',
+  [0xb230]: 'blake2b-384',
+  [0xb231]: 'blake2b-392',
+  [0xb232]: 'blake2b-400',
+  [0xb233]: 'blake2b-408',
+  [0xb234]: 'blake2b-416',
+  [0xb235]: 'blake2b-424',
+  [0xb236]: 'blake2b-432',
+  [0xb237]: 'blake2b-440',
+  [0xb238]: 'blake2b-448',
+  [0xb239]: 'blake2b-456',
+  [0xb23a]: 'blake2b-464',
+  [0xb23b]: 'blake2b-472',
+  [0xb23c]: 'blake2b-480',
+  [0xb23d]: 'blake2b-488',
+  [0xb23e]: 'blake2b-496',
+  [0xb23f]: 'blake2b-504',
+  [0xb240]: 'blake2b-512',
+  [0xb241]: 'blake2s-8',
+  [0xb242]: 'blake2s-16',
+  [0xb243]: 'blake2s-24',
+  [0xb244]: 'blake2s-32',
+  [0xb245]: 'blake2s-40',
+  [0xb246]: 'blake2s-48',
+  [0xb247]: 'blake2s-56',
+  [0xb248]: 'blake2s-64',
+  [0xb249]: 'blake2s-72',
+  [0xb24a]: 'blake2s-80',
+  [0xb24b]: 'blake2s-88',
+  [0xb24c]: 'blake2s-96',
+  [0xb24d]: 'blake2s-104',
+  [0xb24e]: 'blake2s-112',
+  [0xb24f]: 'blake2s-120',
+  [0xb250]: 'blake2s-128',
+  [0xb251]: 'blake2s-136',
+  [0xb252]: 'blake2s-144',
+  [0xb253]: 'blake2s-152',
+  [0xb254]: 'blake2s-160',
+  [0xb255]: 'blake2s-168',
+  [0xb256]: 'blake2s-176',
+  [0xb257]: 'blake2s-184',
+  [0xb258]: 'blake2s-192',
+  [0xb259]: 'blake2s-200',
+  [0xb25a]: 'blake2s-208',
+  [0xb25b]: 'blake2s-216',
+  [0xb25c]: 'blake2s-224',
+  [0xb25d]: 'blake2s-232',
+  [0xb25e]: 'blake2s-240',
+  [0xb25f]: 'blake2s-248',
+  [0xb260]: 'blake2s-256',
 
   // skein
-  0xb301: 'Skein256-8',
-  0xb302: 'Skein256-16',
-  0xb303: 'Skein256-24',
-  0xb304: 'Skein256-32',
-  0xb305: 'Skein256-40',
-  0xb306: 'Skein256-48',
-  0xb307: 'Skein256-56',
-  0xb308: 'Skein256-64',
-  0xb309: 'Skein256-72',
-  0xb30a: 'Skein256-80',
-  0xb30b: 'Skein256-88',
-  0xb30c: 'Skein256-96',
-  0xb30d: 'Skein256-104',
-  0xb30e: 'Skein256-112',
-  0xb30f: 'Skein256-120',
-  0xb310: 'Skein256-128',
-  0xb311: 'Skein256-136',
-  0xb312: 'Skein256-144',
-  0xb313: 'Skein256-152',
-  0xb314: 'Skein256-160',
-  0xb315: 'Skein256-168',
-  0xb316: 'Skein256-176',
-  0xb317: 'Skein256-184',
-  0xb318: 'Skein256-192',
-  0xb319: 'Skein256-200',
-  0xb31a: 'Skein256-208',
-  0xb31b: 'Skein256-216',
-  0xb31c: 'Skein256-224',
-  0xb31d: 'Skein256-232',
-  0xb31e: 'Skein256-240',
-  0xb31f: 'Skein256-248',
-  0xb320: 'Skein256-256',
-  0xb321: 'Skein512-8',
-  0xb322: 'Skein512-16',
-  0xb323: 'Skein512-24',
-  0xb324: 'Skein512-32',
-  0xb325: 'Skein512-40',
-  0xb326: 'Skein512-48',
-  0xb327: 'Skein512-56',
-  0xb328: 'Skein512-64',
-  0xb329: 'Skein512-72',
-  0xb32a: 'Skein512-80',
-  0xb32b: 'Skein512-88',
-  0xb32c: 'Skein512-96',
-  0xb32d: 'Skein512-104',
-  0xb32e: 'Skein512-112',
-  0xb32f: 'Skein512-120',
-  0xb330: 'Skein512-128',
-  0xb331: 'Skein512-136',
-  0xb332: 'Skein512-144',
-  0xb333: 'Skein512-152',
-  0xb334: 'Skein512-160',
-  0xb335: 'Skein512-168',
-  0xb336: 'Skein512-176',
-  0xb337: 'Skein512-184',
-  0xb338: 'Skein512-192',
-  0xb339: 'Skein512-200',
-  0xb33a: 'Skein512-208',
-  0xb33b: 'Skein512-216',
-  0xb33c: 'Skein512-224',
-  0xb33d: 'Skein512-232',
-  0xb33e: 'Skein512-240',
-  0xb33f: 'Skein512-248',
-  0xb340: 'Skein512-256',
-  0xb341: 'Skein512-264',
-  0xb342: 'Skein512-272',
-  0xb343: 'Skein512-280',
-  0xb344: 'Skein512-288',
-  0xb345: 'Skein512-296',
-  0xb346: 'Skein512-304',
-  0xb347: 'Skein512-312',
-  0xb348: 'Skein512-320',
-  0xb349: 'Skein512-328',
-  0xb34a: 'Skein512-336',
-  0xb34b: 'Skein512-344',
-  0xb34c: 'Skein512-352',
-  0xb34d: 'Skein512-360',
-  0xb34e: 'Skein512-368',
-  0xb34f: 'Skein512-376',
-  0xb350: 'Skein512-384',
-  0xb351: 'Skein512-392',
-  0xb352: 'Skein512-400',
-  0xb353: 'Skein512-408',
-  0xb354: 'Skein512-416',
-  0xb355: 'Skein512-424',
-  0xb356: 'Skein512-432',
-  0xb357: 'Skein512-440',
-  0xb358: 'Skein512-448',
-  0xb359: 'Skein512-456',
-  0xb35a: 'Skein512-464',
-  0xb35b: 'Skein512-472',
-  0xb35c: 'Skein512-480',
-  0xb35d: 'Skein512-488',
-  0xb35e: 'Skein512-496',
-  0xb35f: 'Skein512-504',
-  0xb360: 'Skein512-512',
-  0xb361: 'Skein1024-8',
-  0xb362: 'Skein1024-16',
-  0xb363: 'Skein1024-24',
-  0xb364: 'Skein1024-32',
-  0xb365: 'Skein1024-40',
-  0xb366: 'Skein1024-48',
-  0xb367: 'Skein1024-56',
-  0xb368: 'Skein1024-64',
-  0xb369: 'Skein1024-72',
-  0xb36a: 'Skein1024-80',
-  0xb36b: 'Skein1024-88',
-  0xb36c: 'Skein1024-96',
-  0xb36d: 'Skein1024-104',
-  0xb36e: 'Skein1024-112',
-  0xb36f: 'Skein1024-120',
-  0xb370: 'Skein1024-128',
-  0xb371: 'Skein1024-136',
-  0xb372: 'Skein1024-144',
-  0xb373: 'Skein1024-152',
-  0xb374: 'Skein1024-160',
-  0xb375: 'Skein1024-168',
-  0xb376: 'Skein1024-176',
-  0xb377: 'Skein1024-184',
-  0xb378: 'Skein1024-192',
-  0xb379: 'Skein1024-200',
-  0xb37a: 'Skein1024-208',
-  0xb37b: 'Skein1024-216',
-  0xb37c: 'Skein1024-224',
-  0xb37d: 'Skein1024-232',
-  0xb37e: 'Skein1024-240',
-  0xb37f: 'Skein1024-248',
-  0xb380: 'Skein1024-256',
-  0xb381: 'Skein1024-264',
-  0xb382: 'Skein1024-272',
-  0xb383: 'Skein1024-280',
-  0xb384: 'Skein1024-288',
-  0xb385: 'Skein1024-296',
-  0xb386: 'Skein1024-304',
-  0xb387: 'Skein1024-312',
-  0xb388: 'Skein1024-320',
-  0xb389: 'Skein1024-328',
-  0xb38a: 'Skein1024-336',
-  0xb38b: 'Skein1024-344',
-  0xb38c: 'Skein1024-352',
-  0xb38d: 'Skein1024-360',
-  0xb38e: 'Skein1024-368',
-  0xb38f: 'Skein1024-376',
-  0xb390: 'Skein1024-384',
-  0xb391: 'Skein1024-392',
-  0xb392: 'Skein1024-400',
-  0xb393: 'Skein1024-408',
-  0xb394: 'Skein1024-416',
-  0xb395: 'Skein1024-424',
-  0xb396: 'Skein1024-432',
-  0xb397: 'Skein1024-440',
-  0xb398: 'Skein1024-448',
-  0xb399: 'Skein1024-456',
-  0xb39a: 'Skein1024-464',
-  0xb39b: 'Skein1024-472',
-  0xb39c: 'Skein1024-480',
-  0xb39d: 'Skein1024-488',
-  0xb39e: 'Skein1024-496',
-  0xb39f: 'Skein1024-504',
-  0xb3a0: 'Skein1024-512',
-  0xb3a1: 'Skein1024-520',
-  0xb3a2: 'Skein1024-528',
-  0xb3a3: 'Skein1024-536',
-  0xb3a4: 'Skein1024-544',
-  0xb3a5: 'Skein1024-552',
-  0xb3a6: 'Skein1024-560',
-  0xb3a7: 'Skein1024-568',
-  0xb3a8: 'Skein1024-576',
-  0xb3a9: 'Skein1024-584',
-  0xb3aa: 'Skein1024-592',
-  0xb3ab: 'Skein1024-600',
-  0xb3ac: 'Skein1024-608',
-  0xb3ad: 'Skein1024-616',
-  0xb3ae: 'Skein1024-624',
-  0xb3af: 'Skein1024-632',
-  0xb3b0: 'Skein1024-640',
-  0xb3b1: 'Skein1024-648',
-  0xb3b2: 'Skein1024-656',
-  0xb3b3: 'Skein1024-664',
-  0xb3b4: 'Skein1024-672',
-  0xb3b5: 'Skein1024-680',
-  0xb3b6: 'Skein1024-688',
-  0xb3b7: 'Skein1024-696',
-  0xb3b8: 'Skein1024-704',
-  0xb3b9: 'Skein1024-712',
-  0xb3ba: 'Skein1024-720',
-  0xb3bb: 'Skein1024-728',
-  0xb3bc: 'Skein1024-736',
-  0xb3bd: 'Skein1024-744',
-  0xb3be: 'Skein1024-752',
-  0xb3bf: 'Skein1024-760',
-  0xb3c0: 'Skein1024-768',
-  0xb3c1: 'Skein1024-776',
-  0xb3c2: 'Skein1024-784',
-  0xb3c3: 'Skein1024-792',
-  0xb3c4: 'Skein1024-800',
-  0xb3c5: 'Skein1024-808',
-  0xb3c6: 'Skein1024-816',
-  0xb3c7: 'Skein1024-824',
-  0xb3c8: 'Skein1024-832',
-  0xb3c9: 'Skein1024-840',
-  0xb3ca: 'Skein1024-848',
-  0xb3cb: 'Skein1024-856',
-  0xb3cc: 'Skein1024-864',
-  0xb3cd: 'Skein1024-872',
-  0xb3ce: 'Skein1024-880',
-  0xb3cf: 'Skein1024-888',
-  0xb3d0: 'Skein1024-896',
-  0xb3d1: 'Skein1024-904',
-  0xb3d2: 'Skein1024-912',
-  0xb3d3: 'Skein1024-920',
-  0xb3d4: 'Skein1024-928',
-  0xb3d5: 'Skein1024-936',
-  0xb3d6: 'Skein1024-944',
-  0xb3d7: 'Skein1024-952',
-  0xb3d8: 'Skein1024-960',
-  0xb3d9: 'Skein1024-968',
-  0xb3da: 'Skein1024-976',
-  0xb3db: 'Skein1024-984',
-  0xb3dc: 'Skein1024-992',
-  0xb3dd: 'Skein1024-1000',
-  0xb3de: 'Skein1024-1008',
-  0xb3df: 'Skein1024-1016',
-  0xb3e0: 'Skein1024-1024'
+  [0xb301]: 'Skein256-8',
+  [0xb302]: 'Skein256-16',
+  [0xb303]: 'Skein256-24',
+  [0xb304]: 'Skein256-32',
+  [0xb305]: 'Skein256-40',
+  [0xb306]: 'Skein256-48',
+  [0xb307]: 'Skein256-56',
+  [0xb308]: 'Skein256-64',
+  [0xb309]: 'Skein256-72',
+  [0xb30a]: 'Skein256-80',
+  [0xb30b]: 'Skein256-88',
+  [0xb30c]: 'Skein256-96',
+  [0xb30d]: 'Skein256-104',
+  [0xb30e]: 'Skein256-112',
+  [0xb30f]: 'Skein256-120',
+  [0xb310]: 'Skein256-128',
+  [0xb311]: 'Skein256-136',
+  [0xb312]: 'Skein256-144',
+  [0xb313]: 'Skein256-152',
+  [0xb314]: 'Skein256-160',
+  [0xb315]: 'Skein256-168',
+  [0xb316]: 'Skein256-176',
+  [0xb317]: 'Skein256-184',
+  [0xb318]: 'Skein256-192',
+  [0xb319]: 'Skein256-200',
+  [0xb31a]: 'Skein256-208',
+  [0xb31b]: 'Skein256-216',
+  [0xb31c]: 'Skein256-224',
+  [0xb31d]: 'Skein256-232',
+  [0xb31e]: 'Skein256-240',
+  [0xb31f]: 'Skein256-248',
+  [0xb320]: 'Skein256-256',
+  [0xb321]: 'Skein512-8',
+  [0xb322]: 'Skein512-16',
+  [0xb323]: 'Skein512-24',
+  [0xb324]: 'Skein512-32',
+  [0xb325]: 'Skein512-40',
+  [0xb326]: 'Skein512-48',
+  [0xb327]: 'Skein512-56',
+  [0xb328]: 'Skein512-64',
+  [0xb329]: 'Skein512-72',
+  [0xb32a]: 'Skein512-80',
+  [0xb32b]: 'Skein512-88',
+  [0xb32c]: 'Skein512-96',
+  [0xb32d]: 'Skein512-104',
+  [0xb32e]: 'Skein512-112',
+  [0xb32f]: 'Skein512-120',
+  [0xb330]: 'Skein512-128',
+  [0xb331]: 'Skein512-136',
+  [0xb332]: 'Skein512-144',
+  [0xb333]: 'Skein512-152',
+  [0xb334]: 'Skein512-160',
+  [0xb335]: 'Skein512-168',
+  [0xb336]: 'Skein512-176',
+  [0xb337]: 'Skein512-184',
+  [0xb338]: 'Skein512-192',
+  [0xb339]: 'Skein512-200',
+  [0xb33a]: 'Skein512-208',
+  [0xb33b]: 'Skein512-216',
+  [0xb33c]: 'Skein512-224',
+  [0xb33d]: 'Skein512-232',
+  [0xb33e]: 'Skein512-240',
+  [0xb33f]: 'Skein512-248',
+  [0xb340]: 'Skein512-256',
+  [0xb341]: 'Skein512-264',
+  [0xb342]: 'Skein512-272',
+  [0xb343]: 'Skein512-280',
+  [0xb344]: 'Skein512-288',
+  [0xb345]: 'Skein512-296',
+  [0xb346]: 'Skein512-304',
+  [0xb347]: 'Skein512-312',
+  [0xb348]: 'Skein512-320',
+  [0xb349]: 'Skein512-328',
+  [0xb34a]: 'Skein512-336',
+  [0xb34b]: 'Skein512-344',
+  [0xb34c]: 'Skein512-352',
+  [0xb34d]: 'Skein512-360',
+  [0xb34e]: 'Skein512-368',
+  [0xb34f]: 'Skein512-376',
+  [0xb350]: 'Skein512-384',
+  [0xb351]: 'Skein512-392',
+  [0xb352]: 'Skein512-400',
+  [0xb353]: 'Skein512-408',
+  [0xb354]: 'Skein512-416',
+  [0xb355]: 'Skein512-424',
+  [0xb356]: 'Skein512-432',
+  [0xb357]: 'Skein512-440',
+  [0xb358]: 'Skein512-448',
+  [0xb359]: 'Skein512-456',
+  [0xb35a]: 'Skein512-464',
+  [0xb35b]: 'Skein512-472',
+  [0xb35c]: 'Skein512-480',
+  [0xb35d]: 'Skein512-488',
+  [0xb35e]: 'Skein512-496',
+  [0xb35f]: 'Skein512-504',
+  [0xb360]: 'Skein512-512',
+  [0xb361]: 'Skein1024-8',
+  [0xb362]: 'Skein1024-16',
+  [0xb363]: 'Skein1024-24',
+  [0xb364]: 'Skein1024-32',
+  [0xb365]: 'Skein1024-40',
+  [0xb366]: 'Skein1024-48',
+  [0xb367]: 'Skein1024-56',
+  [0xb368]: 'Skein1024-64',
+  [0xb369]: 'Skein1024-72',
+  [0xb36a]: 'Skein1024-80',
+  [0xb36b]: 'Skein1024-88',
+  [0xb36c]: 'Skein1024-96',
+  [0xb36d]: 'Skein1024-104',
+  [0xb36e]: 'Skein1024-112',
+  [0xb36f]: 'Skein1024-120',
+  [0xb370]: 'Skein1024-128',
+  [0xb371]: 'Skein1024-136',
+  [0xb372]: 'Skein1024-144',
+  [0xb373]: 'Skein1024-152',
+  [0xb374]: 'Skein1024-160',
+  [0xb375]: 'Skein1024-168',
+  [0xb376]: 'Skein1024-176',
+  [0xb377]: 'Skein1024-184',
+  [0xb378]: 'Skein1024-192',
+  [0xb379]: 'Skein1024-200',
+  [0xb37a]: 'Skein1024-208',
+  [0xb37b]: 'Skein1024-216',
+  [0xb37c]: 'Skein1024-224',
+  [0xb37d]: 'Skein1024-232',
+  [0xb37e]: 'Skein1024-240',
+  [0xb37f]: 'Skein1024-248',
+  [0xb380]: 'Skein1024-256',
+  [0xb381]: 'Skein1024-264',
+  [0xb382]: 'Skein1024-272',
+  [0xb383]: 'Skein1024-280',
+  [0xb384]: 'Skein1024-288',
+  [0xb385]: 'Skein1024-296',
+  [0xb386]: 'Skein1024-304',
+  [0xb387]: 'Skein1024-312',
+  [0xb388]: 'Skein1024-320',
+  [0xb389]: 'Skein1024-328',
+  [0xb38a]: 'Skein1024-336',
+  [0xb38b]: 'Skein1024-344',
+  [0xb38c]: 'Skein1024-352',
+  [0xb38d]: 'Skein1024-360',
+  [0xb38e]: 'Skein1024-368',
+  [0xb38f]: 'Skein1024-376',
+  [0xb390]: 'Skein1024-384',
+  [0xb391]: 'Skein1024-392',
+  [0xb392]: 'Skein1024-400',
+  [0xb393]: 'Skein1024-408',
+  [0xb394]: 'Skein1024-416',
+  [0xb395]: 'Skein1024-424',
+  [0xb396]: 'Skein1024-432',
+  [0xb397]: 'Skein1024-440',
+  [0xb398]: 'Skein1024-448',
+  [0xb399]: 'Skein1024-456',
+  [0xb39a]: 'Skein1024-464',
+  [0xb39b]: 'Skein1024-472',
+  [0xb39c]: 'Skein1024-480',
+  [0xb39d]: 'Skein1024-488',
+  [0xb39e]: 'Skein1024-496',
+  [0xb39f]: 'Skein1024-504',
+  [0xb3a0]: 'Skein1024-512',
+  [0xb3a1]: 'Skein1024-520',
+  [0xb3a2]: 'Skein1024-528',
+  [0xb3a3]: 'Skein1024-536',
+  [0xb3a4]: 'Skein1024-544',
+  [0xb3a5]: 'Skein1024-552',
+  [0xb3a6]: 'Skein1024-560',
+  [0xb3a7]: 'Skein1024-568',
+  [0xb3a8]: 'Skein1024-576',
+  [0xb3a9]: 'Skein1024-584',
+  [0xb3aa]: 'Skein1024-592',
+  [0xb3ab]: 'Skein1024-600',
+  [0xb3ac]: 'Skein1024-608',
+  [0xb3ad]: 'Skein1024-616',
+  [0xb3ae]: 'Skein1024-624',
+  [0xb3af]: 'Skein1024-632',
+  [0xb3b0]: 'Skein1024-640',
+  [0xb3b1]: 'Skein1024-648',
+  [0xb3b2]: 'Skein1024-656',
+  [0xb3b3]: 'Skein1024-664',
+  [0xb3b4]: 'Skein1024-672',
+  [0xb3b5]: 'Skein1024-680',
+  [0xb3b6]: 'Skein1024-688',
+  [0xb3b7]: 'Skein1024-696',
+  [0xb3b8]: 'Skein1024-704',
+  [0xb3b9]: 'Skein1024-712',
+  [0xb3ba]: 'Skein1024-720',
+  [0xb3bb]: 'Skein1024-728',
+  [0xb3bc]: 'Skein1024-736',
+  [0xb3bd]: 'Skein1024-744',
+  [0xb3be]: 'Skein1024-752',
+  [0xb3bf]: 'Skein1024-760',
+  [0xb3c0]: 'Skein1024-768',
+  [0xb3c1]: 'Skein1024-776',
+  [0xb3c2]: 'Skein1024-784',
+  [0xb3c3]: 'Skein1024-792',
+  [0xb3c4]: 'Skein1024-800',
+  [0xb3c5]: 'Skein1024-808',
+  [0xb3c6]: 'Skein1024-816',
+  [0xb3c7]: 'Skein1024-824',
+  [0xb3c8]: 'Skein1024-832',
+  [0xb3c9]: 'Skein1024-840',
+  [0xb3ca]: 'Skein1024-848',
+  [0xb3cb]: 'Skein1024-856',
+  [0xb3cc]: 'Skein1024-864',
+  [0xb3cd]: 'Skein1024-872',
+  [0xb3ce]: 'Skein1024-880',
+  [0xb3cf]: 'Skein1024-888',
+  [0xb3d0]: 'Skein1024-896',
+  [0xb3d1]: 'Skein1024-904',
+  [0xb3d2]: 'Skein1024-912',
+  [0xb3d3]: 'Skein1024-920',
+  [0xb3d4]: 'Skein1024-928',
+  [0xb3d5]: 'Skein1024-936',
+  [0xb3d6]: 'Skein1024-944',
+  [0xb3d7]: 'Skein1024-952',
+  [0xb3d8]: 'Skein1024-960',
+  [0xb3d9]: 'Skein1024-968',
+  [0xb3da]: 'Skein1024-976',
+  [0xb3db]: 'Skein1024-984',
+  [0xb3dc]: 'Skein1024-992',
+  [0xb3dd]: 'Skein1024-1000',
+  [0xb3de]: 'Skein1024-1008',
+  [0xb3df]: 'Skein1024-1016',
+  [0xb3e0]: 'Skein1024-1024'
 })
 
-exports.defaultLengths = Object.freeze({
-  0x11: 20,
-  0x12: 32,
-  0x13: 64,
-  0x56: 32,
-  0x17: 28,
-  0x16: 32,
-  0x15: 48,
-  0x14: 64,
-  0x18: 32,
-  0x19: 64,
-  0x1A: 28,
-  0x1B: 32,
-  0x1C: 48,
-  0x1D: 64,
-  0x22: 32,
+export const defaultLengths:{[Code]:number} = Object.freeze({
+  [0x11]: 20,
+  [0x12]: 32,
+  [0x13]: 64,
+  [0x56]: 32,
+  [0x17]: 28,
+  [0x16]: 32,
+  [0x15]: 48,
+  [0x14]: 64,
+  [0x18]: 32,
+  [0x19]: 64,
+  [0x1A]: 28,
+  [0x1B]: 32,
+  [0x1C]: 48,
+  [0x1D]: 64,
+  [0x22]: 32,
 
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-  0xb25a: 0x1a,
-  0xb25b: 0x1b,
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-  0xb30e: 0x0e,
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-  0xb317: 0x17,
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-  0xb31a: 0x1a,
-  0xb31b: 0x1b,
-  0xb31c: 0x1c,
-  0xb31d: 0x1d,
-  0xb31e: 0x1e,
-  0xb31f: 0x1f,
-  0xb320: 0x20,
-  0xb321: 0x01,
-  0xb322: 0x02,
-  0xb323: 0x03,
-  0xb324: 0x04,
-  0xb325: 0x05,
-  0xb326: 0x06,
-  0xb327: 0x07,
-  0xb328: 0x08,
-  0xb329: 0x09,
-  0xb32a: 0x0a,
-  0xb32b: 0x0b,
-  0xb32c: 0x0c,
-  0xb32d: 0x0d,
-  0xb32e: 0x0e,
-  0xb32f: 0x0f,
-  0xb330: 0x10,
-  0xb331: 0x11,
-  0xb332: 0x12,
-  0xb333: 0x13,
-  0xb334: 0x14,
-  0xb335: 0x15,
-  0xb336: 0x16,
-  0xb337: 0x17,
-  0xb338: 0x18,
-  0xb339: 0x19,
-  0xb33a: 0x1a,
-  0xb33b: 0x1b,
-  0xb33c: 0x1c,
-  0xb33d: 0x1d,
-  0xb33e: 0x1e,
-  0xb33f: 0x1f,
-  0xb340: 0x20,
-  0xb341: 0x21,
-  0xb342: 0x22,
-  0xb343: 0x23,
-  0xb344: 0x24,
-  0xb345: 0x25,
-  0xb346: 0x26,
-  0xb347: 0x27,
-  0xb348: 0x28,
-  0xb349: 0x29,
-  0xb34a: 0x2a,
-  0xb34b: 0x2b,
-  0xb34c: 0x2c,
-  0xb34d: 0x2d,
-  0xb34e: 0x2e,
-  0xb34f: 0x2f,
-  0xb350: 0x30,
-  0xb351: 0x31,
-  0xb352: 0x32,
-  0xb353: 0x33,
-  0xb354: 0x34,
-  0xb355: 0x35,
-  0xb356: 0x36,
-  0xb357: 0x37,
-  0xb358: 0x38,
-  0xb359: 0x39,
-  0xb35a: 0x3a,
-  0xb35b: 0x3b,
-  0xb35c: 0x3c,
-  0xb35d: 0x3d,
-  0xb35e: 0x3e,
-  0xb35f: 0x3f,
-  0xb360: 0x40,
-  0xb361: 0x01,
-  0xb362: 0x02,
-  0xb363: 0x03,
-  0xb364: 0x04,
-  0xb365: 0x05,
-  0xb366: 0x06,
-  0xb367: 0x07,
-  0xb368: 0x08,
-  0xb369: 0x09,
-  0xb36a: 0x0a,
-  0xb36b: 0x0b,
-  0xb36c: 0x0c,
-  0xb36d: 0x0d,
-  0xb36e: 0x0e,
-  0xb36f: 0x0f,
-  0xb370: 0x10,
-  0xb371: 0x11,
-  0xb372: 0x12,
-  0xb373: 0x13,
-  0xb374: 0x14,
-  0xb375: 0x15,
-  0xb376: 0x16,
-  0xb377: 0x17,
-  0xb378: 0x18,
-  0xb379: 0x19,
-  0xb37a: 0x1a,
-  0xb37b: 0x1b,
-  0xb37c: 0x1c,
-  0xb37d: 0x1d,
-  0xb37e: 0x1e,
-  0xb37f: 0x1f,
-  0xb380: 0x20,
-  0xb381: 0x21,
-  0xb382: 0x22,
-  0xb383: 0x23,
-  0xb384: 0x24,
-  0xb385: 0x25,
-  0xb386: 0x26,
-  0xb387: 0x27,
-  0xb388: 0x28,
-  0xb389: 0x29,
-  0xb38a: 0x2a,
-  0xb38b: 0x2b,
-  0xb38c: 0x2c,
-  0xb38d: 0x2d,
-  0xb38e: 0x2e,
-  0xb38f: 0x2f,
-  0xb390: 0x30,
-  0xb391: 0x31,
-  0xb392: 0x32,
-  0xb393: 0x33,
-  0xb394: 0x34,
-  0xb395: 0x35,
-  0xb396: 0x36,
-  0xb397: 0x37,
-  0xb398: 0x38,
-  0xb399: 0x39,
-  0xb39a: 0x3a,
-  0xb39b: 0x3b,
-  0xb39c: 0x3c,
-  0xb39d: 0x3d,
-  0xb39e: 0x3e,
-  0xb39f: 0x3f,
-  0xb3a0: 0x40,
-  0xb3a1: 0x41,
-  0xb3a2: 0x42,
-  0xb3a3: 0x43,
-  0xb3a4: 0x44,
-  0xb3a5: 0x45,
-  0xb3a6: 0x46,
-  0xb3a7: 0x47,
-  0xb3a8: 0x48,
-  0xb3a9: 0x49,
-  0xb3aa: 0x4a,
-  0xb3ab: 0x4b,
-  0xb3ac: 0x4c,
-  0xb3ad: 0x4d,
-  0xb3ae: 0x4e,
-  0xb3af: 0x4f,
-  0xb3b0: 0x50,
-  0xb3b1: 0x51,
-  0xb3b2: 0x52,
-  0xb3b3: 0x53,
-  0xb3b4: 0x54,
-  0xb3b5: 0x55,
-  0xb3b6: 0x56,
-  0xb3b7: 0x57,
-  0xb3b8: 0x58,
-  0xb3b9: 0x59,
-  0xb3ba: 0x5a,
-  0xb3bb: 0x5b,
-  0xb3bc: 0x5c,
-  0xb3bd: 0x5d,
-  0xb3be: 0x5e,
-  0xb3bf: 0x5f,
-  0xb3c0: 0x60,
-  0xb3c1: 0x61,
-  0xb3c2: 0x62,
-  0xb3c3: 0x63,
-  0xb3c4: 0x64,
-  0xb3c5: 0x65,
-  0xb3c6: 0x66,
-  0xb3c7: 0x67,
-  0xb3c8: 0x68,
-  0xb3c9: 0x69,
-  0xb3ca: 0x6a,
-  0xb3cb: 0x6b,
-  0xb3cc: 0x6c,
-  0xb3cd: 0x6d,
-  0xb3ce: 0x6e,
-  0xb3cf: 0x6f,
-  0xb3d0: 0x70,
-  0xb3d1: 0x71,
-  0xb3d2: 0x72,
-  0xb3d3: 0x73,
-  0xb3d4: 0x74,
-  0xb3d5: 0x75,
-  0xb3d6: 0x76,
-  0xb3d7: 0x77,
-  0xb3d8: 0x78,
-  0xb3d9: 0x79,
-  0xb3da: 0x7a,
-  0xb3db: 0x7b,
-  0xb3dc: 0x7c,
-  0xb3dd: 0x7d,
-  0xb3de: 0x7e,
-  0xb3df: 0x7f,
-  0xb3e0: 0x80
+  [0xb201]: 0x01,
+  [0xb202]: 0x02,
+  [0xb203]: 0x03,
+  [0xb204]: 0x04,
+  [0xb205]: 0x05,
+  [0xb206]: 0x06,
+  [0xb207]: 0x07,
+  [0xb208]: 0x08,
+  [0xb209]: 0x09,
+  [0xb20a]: 0x0a,
+  [0xb20b]: 0x0b,
+  [0xb20c]: 0x0c,
+  [0xb20d]: 0x0d,
+  [0xb20e]: 0x0e,
+  [0xb20f]: 0x0f,
+  [0xb210]: 0x10,
+  [0xb211]: 0x11,
+  [0xb212]: 0x12,
+  [0xb213]: 0x13,
+  [0xb214]: 0x14,
+  [0xb215]: 0x15,
+  [0xb216]: 0x16,
+  [0xb217]: 0x17,
+  [0xb218]: 0x18,
+  [0xb219]: 0x19,
+  [0xb21a]: 0x1a,
+  [0xb21b]: 0x1b,
+  [0xb21c]: 0x1c,
+  [0xb21d]: 0x1d,
+  [0xb21e]: 0x1e,
+  [0xb21f]: 0x1f,
+  [0xb220]: 0x20,
+  [0xb221]: 0x21,
+  [0xb222]: 0x22,
+  [0xb223]: 0x23,
+  [0xb224]: 0x24,
+  [0xb225]: 0x25,
+  [0xb226]: 0x26,
+  [0xb227]: 0x27,
+  [0xb228]: 0x28,
+  [0xb229]: 0x29,
+  [0xb22a]: 0x2a,
+  [0xb22b]: 0x2b,
+  [0xb22c]: 0x2c,
+  [0xb22d]: 0x2d,
+  [0xb22e]: 0x2e,
+  [0xb22f]: 0x2f,
+  [0xb230]: 0x30,
+  [0xb231]: 0x31,
+  [0xb232]: 0x32,
+  [0xb233]: 0x33,
+  [0xb234]: 0x34,
+  [0xb235]: 0x35,
+  [0xb236]: 0x36,
+  [0xb237]: 0x37,
+  [0xb238]: 0x38,
+  [0xb239]: 0x39,
+  [0xb23a]: 0x3a,
+  [0xb23b]: 0x3b,
+  [0xb23c]: 0x3c,
+  [0xb23d]: 0x3d,
+  [0xb23e]: 0x3e,
+  [0xb23f]: 0x3f,
+  [0xb240]: 0x40,
+  [0xb241]: 0x01,
+  [0xb242]: 0x02,
+  [0xb243]: 0x03,
+  [0xb244]: 0x04,
+  [0xb245]: 0x05,
+  [0xb246]: 0x06,
+  [0xb247]: 0x07,
+  [0xb248]: 0x08,
+  [0xb249]: 0x09,
+  [0xb24a]: 0x0a,
+  [0xb24b]: 0x0b,
+  [0xb24c]: 0x0c,
+  [0xb24d]: 0x0d,
+  [0xb24e]: 0x0e,
+  [0xb24f]: 0x0f,
+  [0xb250]: 0x10,
+  [0xb251]: 0x11,
+  [0xb252]: 0x12,
+  [0xb253]: 0x13,
+  [0xb254]: 0x14,
+  [0xb255]: 0x15,
+  [0xb256]: 0x16,
+  [0xb257]: 0x17,
+  [0xb258]: 0x18,
+  [0xb259]: 0x19,
+  [0xb25a]: 0x1a,
+  [0xb25b]: 0x1b,
+  [0xb25c]: 0x1c,
+  [0xb25d]: 0x1d,
+  [0xb25e]: 0x1e,
+  [0xb25f]: 0x1f,
+  [0xb260]: 0x20,
+  [0xb301]: 0x01,
+  [0xb302]: 0x02,
+  [0xb303]: 0x03,
+  [0xb304]: 0x04,
+  [0xb305]: 0x05,
+  [0xb306]: 0x06,
+  [0xb307]: 0x07,
+  [0xb308]: 0x08,
+  [0xb309]: 0x09,
+  [0xb30a]: 0x0a,
+  [0xb30b]: 0x0b,
+  [0xb30c]: 0x0c,
+  [0xb30d]: 0x0d,
+  [0xb30e]: 0x0e,
+  [0xb30f]: 0x0f,
+  [0xb310]: 0x10,
+  [0xb311]: 0x11,
+  [0xb312]: 0x12,
+  [0xb313]: 0x13,
+  [0xb314]: 0x14,
+  [0xb315]: 0x15,
+  [0xb316]: 0x16,
+  [0xb317]: 0x17,
+  [0xb318]: 0x18,
+  [0xb319]: 0x19,
+  [0xb31a]: 0x1a,
+  [0xb31b]: 0x1b,
+  [0xb31c]: 0x1c,
+  [0xb31d]: 0x1d,
+  [0xb31e]: 0x1e,
+  [0xb31f]: 0x1f,
+  [0xb320]: 0x20,
+  [0xb321]: 0x01,
+  [0xb322]: 0x02,
+  [0xb323]: 0x03,
+  [0xb324]: 0x04,
+  [0xb325]: 0x05,
+  [0xb326]: 0x06,
+  [0xb327]: 0x07,
+  [0xb328]: 0x08,
+  [0xb329]: 0x09,
+  [0xb32a]: 0x0a,
+  [0xb32b]: 0x0b,
+  [0xb32c]: 0x0c,
+  [0xb32d]: 0x0d,
+  [0xb32e]: 0x0e,
+  [0xb32f]: 0x0f,
+  [0xb330]: 0x10,
+  [0xb331]: 0x11,
+  [0xb332]: 0x12,
+  [0xb333]: 0x13,
+  [0xb334]: 0x14,
+  [0xb335]: 0x15,
+  [0xb336]: 0x16,
+  [0xb337]: 0x17,
+  [0xb338]: 0x18,
+  [0xb339]: 0x19,
+  [0xb33a]: 0x1a,
+  [0xb33b]: 0x1b,
+  [0xb33c]: 0x1c,
+  [0xb33d]: 0x1d,
+  [0xb33e]: 0x1e,
+  [0xb33f]: 0x1f,
+  [0xb340]: 0x20,
+  [0xb341]: 0x21,
+  [0xb342]: 0x22,
+  [0xb343]: 0x23,
+  [0xb344]: 0x24,
+  [0xb345]: 0x25,
+  [0xb346]: 0x26,
+  [0xb347]: 0x27,
+  [0xb348]: 0x28,
+  [0xb349]: 0x29,
+  [0xb34a]: 0x2a,
+  [0xb34b]: 0x2b,
+  [0xb34c]: 0x2c,
+  [0xb34d]: 0x2d,
+  [0xb34e]: 0x2e,
+  [0xb34f]: 0x2f,
+  [0xb350]: 0x30,
+  [0xb351]: 0x31,
+  [0xb352]: 0x32,
+  [0xb353]: 0x33,
+  [0xb354]: 0x34,
+  [0xb355]: 0x35,
+  [0xb356]: 0x36,
+  [0xb357]: 0x37,
+  [0xb358]: 0x38,
+  [0xb359]: 0x39,
+  [0xb35a]: 0x3a,
+  [0xb35b]: 0x3b,
+  [0xb35c]: 0x3c,
+  [0xb35d]: 0x3d,
+  [0xb35e]: 0x3e,
+  [0xb35f]: 0x3f,
+  [0xb360]: 0x40,
+  [0xb361]: 0x01,
+  [0xb362]: 0x02,
+  [0xb363]: 0x03,
+  [0xb364]: 0x04,
+  [0xb365]: 0x05,
+  [0xb366]: 0x06,
+  [0xb367]: 0x07,
+  [0xb368]: 0x08,
+  [0xb369]: 0x09,
+  [0xb36a]: 0x0a,
+  [0xb36b]: 0x0b,
+  [0xb36c]: 0x0c,
+  [0xb36d]: 0x0d,
+  [0xb36e]: 0x0e,
+  [0xb36f]: 0x0f,
+  [0xb370]: 0x10,
+  [0xb371]: 0x11,
+  [0xb372]: 0x12,
+  [0xb373]: 0x13,
+  [0xb374]: 0x14,
+  [0xb375]: 0x15,
+  [0xb376]: 0x16,
+  [0xb377]: 0x17,
+  [0xb378]: 0x18,
+  [0xb379]: 0x19,
+  [0xb37a]: 0x1a,
+  [0xb37b]: 0x1b,
+  [0xb37c]: 0x1c,
+  [0xb37d]: 0x1d,
+  [0xb37e]: 0x1e,
+  [0xb37f]: 0x1f,
+  [0xb380]: 0x20,
+  [0xb381]: 0x21,
+  [0xb382]: 0x22,
+  [0xb383]: 0x23,
+  [0xb384]: 0x24,
+  [0xb385]: 0x25,
+  [0xb386]: 0x26,
+  [0xb387]: 0x27,
+  [0xb388]: 0x28,
+  [0xb389]: 0x29,
+  [0xb38a]: 0x2a,
+  [0xb38b]: 0x2b,
+  [0xb38c]: 0x2c,
+  [0xb38d]: 0x2d,
+  [0xb38e]: 0x2e,
+  [0xb38f]: 0x2f,
+  [0xb390]: 0x30,
+  [0xb391]: 0x31,
+  [0xb392]: 0x32,
+  [0xb393]: 0x33,
+  [0xb394]: 0x34,
+  [0xb395]: 0x35,
+  [0xb396]: 0x36,
+  [0xb397]: 0x37,
+  [0xb398]: 0x38,
+  [0xb399]: 0x39,
+  [0xb39a]: 0x3a,
+  [0xb39b]: 0x3b,
+  [0xb39c]: 0x3c,
+  [0xb39d]: 0x3d,
+  [0xb39e]: 0x3e,
+  [0xb39f]: 0x3f,
+  [0xb3a0]: 0x40,
+  [0xb3a1]: 0x41,
+  [0xb3a2]: 0x42,
+  [0xb3a3]: 0x43,
+  [0xb3a4]: 0x44,
+  [0xb3a5]: 0x45,
+  [0xb3a6]: 0x46,
+  [0xb3a7]: 0x47,
+  [0xb3a8]: 0x48,
+  [0xb3a9]: 0x49,
+  [0xb3aa]: 0x4a,
+  [0xb3ab]: 0x4b,
+  [0xb3ac]: 0x4c,
+  [0xb3ad]: 0x4d,
+  [0xb3ae]: 0x4e,
+  [0xb3af]: 0x4f,
+  [0xb3b0]: 0x50,
+  [0xb3b1]: 0x51,
+  [0xb3b2]: 0x52,
+  [0xb3b3]: 0x53,
+  [0xb3b4]: 0x54,
+  [0xb3b5]: 0x55,
+  [0xb3b6]: 0x56,
+  [0xb3b7]: 0x57,
+  [0xb3b8]: 0x58,
+  [0xb3b9]: 0x59,
+  [0xb3ba]: 0x5a,
+  [0xb3bb]: 0x5b,
+  [0xb3bc]: 0x5c,
+  [0xb3bd]: 0x5d,
+  [0xb3be]: 0x5e,
+  [0xb3bf]: 0x5f,
+  [0xb3c0]: 0x60,
+  [0xb3c1]: 0x61,
+  [0xb3c2]: 0x62,
+  [0xb3c3]: 0x63,
+  [0xb3c4]: 0x64,
+  [0xb3c5]: 0x65,
+  [0xb3c6]: 0x66,
+  [0xb3c7]: 0x67,
+  [0xb3c8]: 0x68,
+  [0xb3c9]: 0x69,
+  [0xb3ca]: 0x6a,
+  [0xb3cb]: 0x6b,
+  [0xb3cc]: 0x6c,
+  [0xb3cd]: 0x6d,
+  [0xb3ce]: 0x6e,
+  [0xb3cf]: 0x6f,
+  [0xb3d0]: 0x70,
+  [0xb3d1]: 0x71,
+  [0xb3d2]: 0x72,
+  [0xb3d3]: 0x73,
+  [0xb3d4]: 0x74,
+  [0xb3d5]: 0x75,
+  [0xb3d6]: 0x76,
+  [0xb3d7]: 0x77,
+  [0xb3d8]: 0x78,
+  [0xb3d9]: 0x79,
+  [0xb3da]: 0x7a,
+  [0xb3db]: 0x7b,
+  [0xb3dc]: 0x7c,
+  [0xb3dd]: 0x7d,
+  [0xb3de]: 0x7e,
+  [0xb3df]: 0x7f,
+  [0xb3e0]: 0x80
 })
diff --git a/src/index.js b/src/index.js
index 3cbd9bc7..c1c3b3d4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,3 +1,5 @@
+// @flow
+
 /**
  * Multihash implementation in JavaScript.
  *
@@ -5,15 +7,24 @@
  */
 'use strict'
 
-const bs58 = require('bs58')
+import bs58 from 'bs58'
+import varint from 'varint'
+import {names, codes, defaultLengths, type Name, type Code} from "./constants"
+
 
-const cs = require('./constants')
+export {names, codes, defaultLengths}
 
-exports.names = cs.names
-exports.codes = cs.codes
-exports.defaultLengths = cs.defaultLengths
 
-const varint = require('varint')
+export type Multihash = Buffer
+export type MultihashPrefix = Buffer
+export type B58Buffer = Buffer
+export type HexString = string
+export type MultihashData = {
+  code: Code,
+  name: Name,
+  length: number,
+  digest: Buffer
+}
 
 /**
  * Convert the given multihash to a hex encoded string.
@@ -21,7 +32,7 @@ const varint = require('varint')
  * @param {Buffer} hash
  * @returns {string}
  */
-exports.toHexString = function toHexString (hash) {
+export function toHexString (hash:Multihash):HexString {
   if (!Buffer.isBuffer(hash)) {
     throw new Error('must be passed a buffer')
   }
@@ -35,17 +46,18 @@ exports.toHexString = function toHexString (hash) {
  * @param {string} hash
  * @returns {Buffer}
  */
-exports.fromHexString = function fromHexString (hash) {
+export function fromHexString (hash:HexString):Multihash {
   return Buffer.from(hash, 'hex')
 }
 
+export type B58String = string
 /**
  * Convert the given multihash to a base58 encoded string.
  *
  * @param {Buffer} hash
  * @returns {string}
  */
-exports.toB58String = function toB58String (hash) {
+export function toB58String (hash:Multihash):B58String {
   if (!Buffer.isBuffer(hash)) {
     throw new Error('must be passed a buffer')
   }
@@ -59,7 +71,7 @@ exports.toB58String = function toB58String (hash) {
  * @param {string|Buffer} hash
  * @returns {Buffer}
  */
-exports.fromB58String = function fromB58String (hash) {
+export function fromB58String (hash:B58String|B58Buffer):Multihash {
   let encoded = hash
   if (Buffer.isBuffer(hash)) {
     encoded = hash.toString()
@@ -74,7 +86,7 @@ exports.fromB58String = function fromB58String (hash) {
  * @param {Buffer} buf
  * @returns {{code: number, name: string, length: number, digest: Buffer}} result
  */
-exports.decode = function decode (buf) {
+export function decode (buf:Multihash):MultihashData {
   if (!(Buffer.isBuffer(buf))) {
     throw new Error('multihash must be a Buffer')
   }
@@ -84,7 +96,7 @@ exports.decode = function decode (buf) {
   }
 
   let code = varint.decode(buf)
-  if (!exports.isValidCode(code)) {
+  if (!isValidCode(code)) {
     throw new Error(`multihash unknown function code: 0x${code.toString(16)}`)
   }
   buf = buf.slice(varint.decode.bytes)
@@ -101,7 +113,7 @@ exports.decode = function decode (buf) {
 
   return {
     code: code,
-    name: cs.codes[code],
+    name: codes[code],
     length: len,
     digest: buf
   }
@@ -117,13 +129,13 @@ exports.decode = function decode (buf) {
  * @param {number} [length]
  * @returns {Buffer}
  */
-exports.encode = function encode (digest, code, length) {
+export function encode (digest:Buffer, code:Code, length:number):Multihash {
   if (!digest || !code) {
     throw new Error('multihash encode requires at least two args: digest, code')
   }
 
   // ensure it's a hashfunction code.
-  const hashfn = exports.coerceCode(code)
+  const hashfn = coerceCode(code)
 
   if (!(Buffer.isBuffer(digest))) {
     throw new Error('digest should be a Buffer')
@@ -150,21 +162,22 @@ exports.encode = function encode (digest, code, length) {
  * @param {string|number} name
  * @returns {number}
  */
-exports.coerceCode = function coerceCode (name) {
+// TODO: Sholud we just allow Name here instead ?
+export function coerceCode (name:Name|Code):Code {
   let code = name
 
   if (typeof name === 'string') {
-    if (!cs.names[name]) {
+    if (!names[name]) {
       throw new Error(`Unrecognized hash function named: ${name}`)
     }
-    code = cs.names[name]
+    code = names[name]
   }
 
   if (typeof code !== 'number') {
     throw new Error(`Hash function code should be a number. Got: ${code}`)
   }
 
-  if (!cs.codes[code] && !exports.isAppCode(code)) {
+  if (!codes[code] && !exports.isAppCode(code)) {
     throw new Error(`Unrecognized function code: ${code}`)
   }
 
@@ -177,7 +190,7 @@ exports.coerceCode = function coerceCode (name) {
  * @param {number} code
  * @returns {boolean}
  */
-exports.isAppCode = function appCode (code) {
+export function isAppCode (code:number):boolean {
   return code > 0 && code < 0x10
 }
 
@@ -187,12 +200,12 @@ exports.isAppCode = function appCode (code) {
  * @param {number} code
  * @returns {boolean}
  */
-exports.isValidCode = function validCode (code) {
-  if (exports.isAppCode(code)) {
+export function isValidCode(code:number):boolean {
+  if (isAppCode(code)) {
     return true
   }
 
-  if (cs.codes[code]) {
+  if (codes[(code:any)]) {
     return true
   }
 
@@ -206,19 +219,18 @@ exports.isValidCode = function validCode (code) {
  * @returns {undefined}
  * @throws {Error}
  */
-function validate (multihash) {
-  exports.decode(multihash) // throws if bad.
+export function validate (multihash:Buffer) {
+  decode(multihash) // throws if bad.
 }
-exports.validate = validate
 
 /**
  * Returns a prefix from a valid multihash. Throws an error if it is not valid.
  *
  * @param {Buffer} multihash
- * @returns {undefined}
+ * @returns {Buffer}
  * @throws {Error}
  */
-exports.prefix = function prefix (multihash) {
+export function prefix (multihash:Multihash):MultihashPrefix {
   validate(multihash)
 
   return multihash.slice(0, 2)
diff --git a/test/index.spec.js b/test/index.spec.js
index d103d777..6abc4860 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -9,8 +9,8 @@ const expect = chai.expect
 const bufeq = require('buffer-equal')
 const bs58 = require('bs58')
 
-const mh = require('../src')
-const constants = require('../src/constants')
+const mh = require('../lib')
+const constants = require('../lib/constants')
 const validCases = require('./fixtures/valid')
 const invalidCases = require('./fixtures/invalid')
 
diff --git a/test/node.js b/test/node.js
new file mode 100644
index 00000000..0998241b
--- /dev/null
+++ b/test/node.js
@@ -0,0 +1,4 @@
+// TODO: Instead mocha should be passed additional arg
+// `--require source-map-support/register` but as things stand now there is
+// no way to do it without changes to aegir so we do this instead for now.
+require("source-map-support/register")