ed2curve-blake2b
Modified functionality from libsodium to convert ed25519 signing keys to curve25519 encryption keys for NaCl/libsodium-compatible keys generated using Blake2b-512 hash instead of SHA-512 hash, is translated into Javascript by Emscripten.
The file ed2curve-blake2b/src/libsodium/sodium.js is the optimized output of Enscripten, ready for use, with an interface ed2curve-blake2b/src/libsodium/ed2curve-blake2b.js. They are both on the ed2curve branch of this repository
Node.js usage:
$ npm i ed2curve-blake2b
Node.js code snippet:
const ed2curve = require('ed2curve-blake2b')
const signingKeys = { SK: <Uint8Array>, PK: <Uint8Array> } // SK is SecretKey, PK is PublicKey
const encryptionKeys = ed2curve(signingKeys) // { SK: <Uint8Array>, PK: <Uint8Array> }
One key of the signing pair may be ommited, in which case null will be returned for the corresponding encryption key.
Build instructions
To create sodium.js from libsodium, install Emscripten, then:
$ git clone https://github.com/lumenano/ed2curve-blake2b.git
$ cd ed2curve-blake2b
$ git checkout ed2curve
$ cd src/libsodium
$ ./make.sh
This build works with browserify.