dartnative_crypto

RSA and AES cryptography for DartNative — generate keys, encrypt/decrypt, and sign/verify against native crypto. iOS and Android, one API.

Why you'll like it

• RSA, done properly — OAEP and PKCS#1 v1.5 encryption, PSS and PKCS#1 v1.5 signing.
• AES-GCM — authenticated symmetric encryption in two calls.
• Strings or bytes — every RSA op has a …Bytes variant for raw Uint8List, plus key tooling (generate, PKCS#1 ↔ PKCS#8, derive the public key, PEM-encrypt a private key).

Highlights

• RSA.generate(bits) → an RSAKeyPair (PEM public + private keys).
• RSA.encryptOAEP / decryptOAEP — OAEP encryption (with …Bytes variants).
• RSA.signPSS / verifyPSS (and signPKCS1v15 / verifyPKCS1v15) — signatures.
• AES.encrypt(data, key) / AES.decrypt(data, key) — AES-GCM.
• AES.pbkdf2(…) — PBKDF2 key derivation; AES.digest(data, algorithm) — SHA-256/384/512.
• RSA key tooling — convert between PKCS#1 / PKCS#8 / PKIX / JWK, derive the public key, PEM-encrypt.

Install

dependencies:
  dartnative_crypto: ^1.0.0   # from dartpub.dev

dn pub get

void main() {
  DartNativePluginRegistrant.registerAll();
  runApp(const MyApp());
}

Quick look

import 'package:dartnative_crypto/dartnative_crypto.dart';

Generate a key pair, then encrypt + decrypt (OAEP):

final pair = await RSA.generate(2048);

final cipher = await RSA.encryptOAEP('hello', '', RSAHash.SHA256, pair.publicKey);
final clear  = await RSA.decryptOAEP(cipher, '', RSAHash.SHA256, pair.privateKey);

Sign + verify (PSS):

final sig = await RSA.signPSS('message', RSAHash.SHA256, SaltLength.AUTO, pair.privateKey);
final ok  = await RSA.verifyPSS(sig, 'message', RSAHash.SHA256, SaltLength.AUTO, pair.publicKey);

AES-GCM:

final encrypted = await AES.encrypt(data, key); // Uint8List
final decrypted = await AES.decrypt(encrypted, key);

Platform setup

iOS

No native setup required (iOS 13+).

Android

No native setup required (Android API 26+ / Android 8).

Example

The example/ app generates keys and round-trips encrypt/decrypt and sign/verify — borrow from it freely.

Credits & license

Adapted from flutter-rsa (MIT) and native-crypto-flutter (MIT), reworked to FFI.

Commercial plugin distributed via dartpub.dev — file issues on the plugin's page.