react-native-libsodium-expo-plugin

A port of Frank Denis' libsodium cryptography library for React Native. This library is intended to be a drop-in replacement for pre-existing NodeJs and JavaScript ports.

Only a subset of the functions have been exposed, however, contributions are most welcome. You can read our guide for clear information on how to go about exposing new methods.

Installation

npm install react-native-libsodium

Usage

import sodium from "react-native-libsodium";

const key = sodium_malloc(sodium.crypto_kdf_KEYBYTES)
const subkey = sodium_malloc(sodium.crypto_kdf_BYTES_MAX)
const ctx = sodium_malloc(sodium.crypto_kdf_CONTEXTBYTES

sodium.crypto_kdf_keygen(key);
sodium.crypto_kdf_derive_from_key(subkey, 1, ctx, key)

API

Full API documentation for each method may be found under the links in each section.

crypto_aead_xchacha20poly1305

Authenticated encryption

Methods

  crypto_aead_xchacha20poly1305_ietf_keygen
  crypto_aead_xchacha20poly1305_ietf_encrypt
  crypto_aead_xchacha20poly1305_ietf_decrypt

  crypto_aead_chacha20poly1305_ietf_keygen
  crypto_aead_chacha20poly1305_ietf_encrypt
  crypto_aead_chacha20poly1305_ietf_decrypt

Constants

  crypto_aead_xchacha20poly1305_ietf_KEYBYTES
  crypto_aead_xchacha20poly1305_ietf_NPUBBYTES
  crypto_aead_xchacha20poly1305_ietf_ABYTES

  crypto_aead_chacha20poly1305_ietf_KEYBYTES
  crypto_aead_chacha20poly1305_ietf_NPUBBYTES
  crypto_aead_chacha20poly1305_ietf_ABYTES

Curve arithemetic

Curve25519 & Ed25519 arithmetic

Methods

  crypto_core_ed25519_scalar_random
  crypto_core_ed25519_add
  crypto_core_ed25519_sub
  crypto_core_ed25519_from_uniform

  crypto_scalarmult
  crypto_scalarmult_base

  crypto_scalarmult_ed25519
  crypto_scalarmult_ed25519_base

Clamping involves clearing the lowest 3 bits of the result, ensuring the result lies on the main subgroup of the curve. However, this breaks point inversion which is undesireable for some protcocols. See here for a more detailed explanation.

  crypto_scalarmult_ed25519_noclamp
  crypto_scalarmult_ed25519_base_noclamp

Constants

  crypto_core_ed25519_SCALARBYTES
  crypto_core_ed25519_BYTES
  crypto_core_ed25519_UNIFORMBYTES

  crypto_scalarmult_ed25519_BYTES
  crypto_scalarmult_ed25519_SCALARBYTES

crypto_pwhash

Password Hashing

Methods

  crypto_pwhash
  crypto_pwhash_async

Constants

  crypto_pwhash_BYTES_MIN
  crypto_pwhash_BYTES_MAX
  crypto_pwhash_PASSWD_MIN
  crypto_pwhash_PASSWD_MAX
  crypto_pwhash_SALTBYTES
  crypto_pwhash_OPSLIMIT_MIN
  crypto_pwhash_OPSLIMIT_MAX
  crypto_pwhash_MEMLIMIT_MIN
  crypto_pwhash_MEMLIMIT_MAX
  crypto_pwhash_ALG_DEFAULT
  crypto_pwhash_ALG_ARGON2I13
  crypto_pwhash_ALG_ARGON2ID13
  crypto_pwhash_BYTES_MIN
  crypto_pwhash_BYTES_MAX
  crypto_pwhash_PASSWD_MIN
  crypto_pwhash_PASSWD_MAX
  crypto_pwhash_SALTBYTES
  crypto_pwhash_STRBYTES
  crypto_pwhash_OPSLIMIT_MIN
  crypto_pwhash_OPSLIMIT_MAX
  crypto_pwhash_MEMLIMIT_MIN
  crypto_pwhash_MEMLIMIT_MAX
  crypto_pwhash_OPSLIMIT_INTERACTIVE
  crypto_pwhash_MEMLIMIT_INTERACTIVE
  crypto_pwhash_OPSLIMIT_MODERATE
  crypto_pwhash_MEMLIMIT_MODERATE
  crypto_pwhash_OPSLIMIT_SENSITIVE
  crypto_pwhash_MEMLIMIT_SENSITIVE

crypto_generichash

Blake2b hashing

Methods

  crypto_generichash
  crypto_generichash_init
  crypto_generichash_update
  crypto_generichash_final
  crypto_generichash_batch

Constants

  crypto_generichash_STATEBYTES
  crypto_generichash_KEYBYTES_MIN
  crypto_generichash_KEYBYTES_MAX
  crypto_generichash_BYTES
  crypto_generichash_BYTES_MIN
  crypto_generichash_BYTES_MAX

crypto_kx

Key exchange

Methods

  crypto_kx_keypair

Constants

  crypto_kx_PUBLICKEYBYTES
  crypto_kx_SECRETKEYBYTES

crypto_kdf

Key derivation

Methods

  crypto_kdf_keygen
  crypto_kdf_derive_from_key

Constants

  crypto_kdf_KEYBYTES
  crypto_kdf_BYTES_MIN
  crypto_kdf_BYTES_MAX
  crypto_kdf_CONTEXTBYTES

crypto_secretstream_xchacha20poly1305

Stream encryption

Methods

  crypto_secretstream_xchacha20poly1305_keygen
  crypto_secretstream_xchacha20poly1305_init_push
  crypto_secretstream_xchacha20poly1305_push
  crypto_secretstream_xchacha20poly1305_init_pull
  crypto_secretstream_xchacha20poly1305_pull

Constants

  crypto_secretstream_xchacha20poly1305_STATEBYTES
  crypto_secretstream_xchacha20poly1305_ABYTES
  crypto_secretstream_xchacha20poly1305_HEADERBYTES
  crypto_secretstream_xchacha20poly1305_KEYBYTES
  crypto_secretstream_xchacha20poly1305_TAGBYTES
  crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX

  crypto_secretstream_xchacha20poly1305_TAG_MESSAGE
  crypto_secretstream_xchacha20poly1305_TAG_PUSH
  crypto_secretstream_xchacha20poly1305_TAG_REKEY
  crypto_secretstream_xchacha20poly1305_TAG_FINAL

crypto_secretbox

Secret key box encryption

Methods

  crypto_secretbox_easy

randombytes_buf

Generating random data

  randombytes_buf

Padding

Padding.

  sodium_pad
  sodium_unpad

Utilities

Various helpers for securely handling memory.

  sodium_memcmp  // constant time
  sodium_memzero
  sodium_free
  sodium_malloc

License

MIT