Fast RSA

March 2, 2025 · View on GitHub

Library for use RSA with support for android, ios, macos, windows, linux and web

Fast RSA
- Contents
- Usage
  - Async methods
  - Sync methods
- Setup
  - Android
  - iOS
  - Web
  - MacOS
  - Linux
  - Windows
- Example
- Native Code

Usage

Async Methods

Encrypt methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.encryptOAEP(message, label, Hash.HASH_SHA256, publicKey)
var result = await RSA.encryptPKCS1v15(message, publicKey)

var result = await RSA.encryptOAEPBytes(messageBytes, label, Hash.SHA256, publicKey)
var result = await RSA.encryptPKCS1v15Bytes(messageBytes, publicKey)

Decrypt methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.decryptOAEP(message, label, Hash.HASH_SHA256, privateKey)
var result = await RSA.decryptPKCS1v15(message, privateKey)

var result = await RSA.decryptOAEPBytes(messageBytes, label, Hash.SHA256, privateKey)
var result = await RSA.decryptPKCS1v15Bytes(messageBytes, privateKey)

Sign methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.signPSS(message, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, privateKey)
var result = await RSA.signPKCS1v15(message, Hash.SHA256, privateKey)

var result = await RSA.signPSSBytes(messageBytes, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, privateKey)
var result = await RSA.signPKCS1v15Bytes(messageBytes, Hash.SHA256, privateKey)

Verify methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.verifyPSS(signature, message, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, publicKey)
var result = await RSA.verifyPKCS1v15(signature, message, Hash.SHA256, publicKey)

var result = await RSA.verifyPSSBytes(signatureBytes, messageBytes, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, publicKey)
var result = await RSA.verifyPKCS1v15Bytes(signatureBytes, messageBytes, Hash.SHA256, publicKey)

Generate Methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.generate(2048)

Convert Methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.convertJWKToPrivateKey(data, keyId);
var result = await RSA.convertJWKToPublicKey(data, keyId);

var result = await RSA.convertKeyPairToPKCS12(privateKey, certificate, password);
var result = await RSA.convertPKCS12ToKeyPair(pkcs12, password);

var result = await RSA.convertPrivateKeyToPKCS8(privateKey);
var result = await RSA.convertPrivateKeyToPKCS1(privateKey);
var result = await RSA.convertPrivateKeyToJWK(privateKey);

var result = await RSA.convertPrivateKeyToPublicKey(privateKey);

var result = await RSA.convertPublicKeyToPKIX(publicKey);
var result = await RSA.convertPublicKeyToPKCS1(publicKey);
var result = await RSA.convertPublicKeyToJWK(publicKey);

var result = await RSA.encryptPrivateKey(privateKey, password, PEMCipher.PEMCIPHER_AES256);
var result = await RSA.decryptPrivateKey(privateKeyEncrypted, password);

Util Methods

import 'package:fast_rsa/fast_rsa.dart';

var result = await RSA.hash(message, Hash.SHA256);
var result = await RSA.base64(message);

Sync Methods

Encrypt methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.encryptOAEP(message, label, Hash.HASH_SHA256, publicKey);
var result = RSASync.encryptPKCS1v15(message, publicKey);

var result = RSASync.encryptOAEPBytes(messageBytes, label, Hash.SHA256, publicKey);
var result = RSASync.encryptPKCS1v15Bytes(messageBytes, publicKey);

Decrypt methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.decryptOAEP(message, label, Hash.HASH_SHA256, privateKey);
var result = RSASync.decryptPKCS1v15(message, privateKey);

var result = RSASync.decryptOAEPBytes(messageBytes, label, Hash.SHA256, privateKey);
var result = RSASync.decryptPKCS1v15Bytes(messageBytes, privateKey);

Sign methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.signPSS(message, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, privateKey);
var result = RSASync.signPKCS1v15(message, Hash.SHA256, privateKey);

var result = RSASync.signPSSBytes(messageBytes, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, privateKey);
var result = RSASync.signPKCS1v15Bytes(messageBytes, Hash.SHA256, privateKey);

Verify methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.verifyPSS(signature, message, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, publicKey);
var result = RSASync.verifyPKCS1v15(signature, message, Hash.SHA256, publicKey);

var result = RSASync.verifyPSSBytes(signatureBytes, messageBytes, Hash.SHA256, SaltLength.SALTLENGTH_AUTO, publicKey);
var result = RSASync.verifyPKCS1v15Bytes(signatureBytes, messageBytes, Hash.SHA256, publicKey);

Generate Methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.generate(2048)

Convert Methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.convertJWKToPrivateKey(data, keyId);
var result = RSASync.convertJWKToPublicKey(data, keyId);

var result = RSASync.convertKeyPairToPKCS12(privateKey, certificate, password);
var result = RSASync.convertPKCS12ToKeyPair(pkcs12, password);

var result = RSASync.convertPrivateKeyToPKCS8(privateKey);
var result = RSASync.convertPrivateKeyToPKCS1(privateKey);
var result = RSASync.convertPrivateKeyToJWK(privateKey);

var result = RSASync.convertPrivateKeyToPublicKey(privateKey);

var result = RSASync.convertPublicKeyToPKIX(publicKey);
var result = RSASync.convertPublicKeyToPKCS1(publicKey);
var result = RSASync.convertPublicKeyToJWK(publicKey);

var result = RSASync.encryptPrivateKey(privateKey, password, PEMCipher.PEMCIPHER_AES256);
var result = RSASync.decryptPrivateKey(privateKeyEncrypted, password);

Util Methods

import 'package:fast_rsa/fast_rsa_sync.dart';

var result = RSASync.hash(message, Hash.SHA256);
var result = RSASync.base64(message);

Setup

Android

No additional setup required.

iOS

No additional setup required.

Web

add to you pubspec.yaml

assets:
  - packages/fast_rsa/web/assets/worker.js
  - packages/fast_rsa/web/assets/wasm_exec.js
  - packages/fast_rsa/web/assets/rsa.wasm

ref: https://github.com/jerson/flutter-rsa/blob/master/example/pubspec.yaml

MacOS

no additional setup required

Linux

No additional setup required.

Windows

No additional setup required.

Example

Inside example folder

cd example && flutter run

check our web demo: [https://flutter-rsa.jerson.dev/]

Native Code

the native library is made in Golang and build with gomobile for faster performance

https://github.com/jerson/rsa-mobile