cardano-crypto.js

cardano-crypto.js

• input-output-hk/cardano-crypto
• haskell-crypto/cryptonite
• grigorig/chachapoly

compiled to pure javascript using Emscripten. This is a collection of cryptolibraries and functions useful for working with Cardano cryptocurrency, eliminating the need for many dependencies.

examples

signing

var lib = require('cardano-crypto.js')

var mnemonic = 'logic easily waste eager injury oval sentence wine bomb embrace gossip supreme'
var walletSecret = await lib.mnemonicToRootKeypair(mnemonic, 1)
var msg = new Buffer('hello there')
var sig = lib.sign(msg, walletSecret)

deriving child keys (hardened derivation, you can choose either derivation scheme 1 or 2)

var lib = require('cardano-crypto.js')

var mnemonic = 'logic easily waste eager injury oval sentence wine bomb embrace gossip supreme'
var parentWalletSecret = lib.mnemonicToRootKeypair(mnemonic, 1)
var childWalletSecret = lib.derivePrivate(parentWalletSecret, 0x80000001, 1)

deriving child public keys (nonhardened derivation, you can choose either derivation scheme 1 or 2)

var lib = require('cardano-crypto.js')

var mnemonic = 'logic easily waste eager injury oval sentence wine bomb embrace gossip supreme'
var parentWalletSecret = lib.mnemonicToRootKeypair(mnemonic, 1)
var parentWalletPublicKey = parentWalletSecret.slice(64, 128)
var childWalletSecret = lib.derivePublic(parentWalletPublicKey, 1, 1)

available functions

• Buffer sign(Buffer msg, Buffer walletSecret)
• Bool verify(Buffer msg, Buffer publicKey, Buffer sig)
• async Buffer mnemonicToRootKeypair(String mnemonic, int derivationScheme)
• Buffer derivePrivate(Buffer parentKey, int index, int derivationScheme)
• Buffer derivePublic(Buffer parentExtPubKey, int index, int derivationScheme)
• Buffer toPublic(Buffer privateKey)
• Buffer decodePaperWalletMnemonic(string paperWalletMnemonic)
• Buffer xpubToHdPassphrase(Buffer xpub)
• string packAddress(Array[int] derivationPath, Buffer xpub, Buffer hdPassphrase, int derivationScheme)
• string unpackAddress(string address, Buffer hdPassphrase)
• Bool isValidAddress(string address)
• Buffer blake2b(Buffer input, outputLen)
• Buffer cardanoMemoryCombine(Buffer input, String password)
• [base58](https://www.npmjs.com/package/base58)
• [scrypt](https://www.npmjs.com/package/scrypt-async)

We encourage you to take a look at test/index.js to see how the functions above should be used.

development

• Install emscripten, recommended version is 1.38.8
• run npm install
• run npm run build

emscripten build example

git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install sdk-1.38.8-64bit
./emsdk activate sdk-1.38.8-64bit
source ./emsdk_env.sh
cd ../
git clone https://github.com/vacuumlabs/cardano-crypto.js
cd cardano-crypto.js
npm install
npm run build
shasum lib.js # should match shasum of published version of lib.js

known issues

When trying to compile the library with emscripten 1.38.41, the cardanoMemoryCombine function slows down significantly. With the 1.38.8 version it runs significantly faster.

tests

• run npm run test

Removing wordlists from webpack/browserify

• bitcoinjs/bip39

Browserify/Webpack bundles can get very large if you include all the wordlists, so you can now exclude wordlists to make your bundle lighter.

For example, if we want to exclude all wordlists besides chinese_simplified, you could build using the browserify command below.

$ browserify -r bip39 -s bip39 \
 --exclude=./wordlists/english.json \
 --exclude=./wordlists/japanese.json \
 --exclude=./wordlists/spanish.json \
 --exclude=./wordlists/italian.json \
 --exclude=./wordlists/french.json \
 --exclude=./wordlists/korean.json \
 --exclude=./wordlists/chinese_traditional.json \
  > bip39.browser.js

This will create a bundle that only contains the chinese_simplified wordlist, and it will be the default wordlist for all calls without explicit wordlists.

You can also do this in Webpack using the IgnorePlugin. Here is an example of excluding all non-English wordlists

...
plugins: [
  new webpack.IgnorePlugin(/^\.\/wordlists\/(?!english)/, /bip39\/src$/),
],
...