Scrypt for key derivation, chacha20+poly1305 for authenticated secret-key encryption. In Javascript, https://github.com/jedisct1/libsodium.js https://github.com

Scrypt for key derivation, chacha20+poly1305 for authenticated secret-key encryption. In Javascript, https://github.com/jedisct1/libsodium.js https://github.com/jedisct1/libsodium.js provides them.