Package detailsv2.1.0

rsa_pkcs

Privacy-Enhanced Mail (PEM) parser, RSA, PKCS#1, PKCS#8, X.509

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30-day downloads: 127K
Likes: 5
Pub points: 140

Install package

flutter pub add rsa_pkcs

Package Overview

Package selection guidance compiled from public package information, community data, and project usage.

A Dart package for parsing and handling cryptographic formats including PEM, RSA, PKCS#1, PKCS#8, and X.509. It enables secure key management and digital signature operations across multiple platforms. The library supports reading and writing encrypted private keys, public keys, and certificates in standard formats, making it suitable for applications requiring robust encryption and authentication. Built with cross-platform compatibility in mind, it works seamlessly on Android, iOS, Web, macOS, Windows, and Linux.

Use cases

Secure key storage
Digital signature verification
TLS/SSL certificate handling
Authentication token generation
Encrypted data exchange
Public key infrastructure integration

Key features

PEM format parsing
Support for PKCS#1 and PKCS#8 standards
X.509 certificate support
Cross-platform compatibility
RSA key operations
Secure key encoding/decoding

Suitable for

Mobile and web apps needing encryption
Backend services with security requirements
Applications using JWT or OAuth
Systems implementing secure communications
Developers working with digital certificates

Considerations

Requires careful handling of private keys
Not intended for high-performance cryptographic workloads
Depends on external crypto libraries
Limited to RSA and related standards
Best used with proper security practices

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

rsa_pkcs

Privacy-Enhanced Mail (PEM) parser, RSA, PKCS#1, PKCS#8, X.509

openssl genrsa -out rsa_private_key.pem

openssl rsa -in rsa_private_key.pem -text -noout -out rsa_private_key.txt

openssl pkcs8 -in rsa_private_key.pem -topk8 -v2 aes-256-cbc -out rsa_enc_private_key.pem

openssl pkcs8 -in rsa_private_key.pem -topk8 -v2 aes-256-cbc -v2prf hmacWithSHA256 -out rsa_enc_private_key.pem

openssl pkcs8 -in rsa_private_key.pem -nocrypt -topk8 -out rsa_pkcs8_private_key.pem

library rsa_pkcs_test;

import 'dart:io';
import 'package:test/test.dart';
import 'package:rsa_pkcs/rsa_pkcs.dart';

/// Test suite
void main() {
  test('X509 certificate', () {
    final certificateFile = File('test/resource/certificate.pem');
    final pem = certificateFile.readAsStringSync();

    final parser = RSAPKCSParser();
    final pair = parser.parsePEM(pem);

    expect(pair.private, isNull);
    expect(pair.public, isNotNull);

    expect(
        pair.public.modulus,
        BigInt.parse(
          '28033090497217768360343969660651078939521584065407386701840944857554190333345377486890608592313957403519912593868573272324833566960046565212209064828701606844042844758296252915683436083950709369588282830401703789082050482708460081183032757865928569658700963214439372520258229921591300947157909982421739994731742762665888890674063869593136209633509251161824923657193583205462354862058115540928040675840828039354822562384195703281964881672495986693976525885611588824710685812476559097665742184509878129643078068928823514354625680850083823859349966847983641526471178472606740080720731992805405488827115995037727686469357',
        ));
    expect(pair.public.publicExponent, equals(65537));
  });

  test('rsa private key PKCS#1', () {
    //openssl genrsa -out rsa_private_key.pem
    //
    final File rsaPrivateKeyFile = File('test/resource/rsa_private_key.pem');
    final String pem = rsaPrivateKeyFile.readAsStringSync();
    final RSAPKCSParser parser = RSAPKCSParser();
    final RSAKeyPair pair = parser.parsePEM(pem);
    final RSAPrivateKey privateKey = pair.private;

    expect(pair.public, equals(null));
    expect(privateKey != null, equals(true));
    expect(privateKey.version, equals(0));
    final BigInt expectedModulus = BigInt.parse(
      '00d83c3cacb3b767a1020f947ca2012010ba494d86bda1efd437357b91d5c1e61b12384cd3c01f628312a5ef15cf003f62c4f6b835bbb3ea99409f87e583fa6991',
      radix: 16,
    );
    expect(privateKey.modulus, expectedModulus);
    expect(privateKey.publicExponent, equals(65537));

    final BigInt expectedPrivateComponent = BigInt.parse(
        '00a0c22fcda992b9cd5eeddc53c85193d83bd6917791f6198a293d6ecfde1e5885fbc0a766aaca385dd8b3b16a58201baec3900b5c1636321a0167e956d5fbe001',
        radix: 16);
    expect(privateKey.privateExponent, expectedPrivateComponent);
    expect(
        privateKey.prime1,
        BigInt.parse(
            '00f3103a1bb14f88f096983ecd86cb51f9e0e9325030039be4fbb4176de1b73f91',
            radix: 16));
    expect(
        privateKey.prime2,
        BigInt.parse(
            '00e3be793b593e4ed5bce5db1ff563468eeb5cc715b12badf223d1970cd88f8a01',
            radix: 16));
    expect(
        privateKey.exponent1,
        BigInt.parse(
            '7e4e8863ab98310914b8b8aa04c9d3278e809fec9b86c49411585c74753ecc81',
            radix: 16));
    expect(
        privateKey.exponent2,
        BigInt.parse(
            '687f8272f7ecfe11569e855ff1a17ec39f3d2fe0452e0c9f794df7281eca2601',
            radix: 16));
    expect(
        privateKey.coefficient,
        BigInt.parse(
            '0092e895c1a9b7b705fb694bba2d52cb9901d4628db794eb43861b086c557d2913',
            radix: 16));
  });

  test('rsa public key PKCS#8', () {
    //openssl genrsa -out rsa_private_key.pem
    //openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
    final File rsaPrivateKeyFile = File('test/resource/rsa_public_key.pem');
    final String pem = rsaPrivateKeyFile.readAsStringSync();
    final RSAPKCSParser parser = RSAPKCSParser();
    final RSAKeyPair pair = parser.parsePEM(pem);
    final RSAPrivateKey privateKey = pair.private;
    final RSAPublicKey publicKey = pair.public;

    expect(privateKey, equals(null));
    expect(publicKey != null, equals(true));

    expect(
        publicKey.modulus,
        BigInt.parse(
            '00d83c3cacb3b767a1020f947ca2012010ba494d86bda1efd437357b91d5c1e61b12384cd3c01f628312a5ef15cf003f62c4f6b835bbb3ea99409f87e583fa6991',
            radix: 16));
    expect(publicKey.publicExponent, equals(65537));
  });

  test('rsa private key PKCS#8', () {
    //openssl genrsa -out rsa_private_key.pem
    //openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
    final File rsaPrivateKeyFile =
        File('test/resource/rsa_pkcs8_private_key.pem');
    final String pem = rsaPrivateKeyFile.readAsStringSync();
    final RSAPKCSParser parser = RSAPKCSParser();
    final RSAKeyPair pair = parser.parsePEM(pem);
    final RSAPrivateKey privateKey = pair.private;
    final RSAPublicKey publicKey = pair.public;

    expect(privateKey != null, equals(true));
    expect(publicKey, equals(null));

    expect(
        privateKey.modulus,
        BigInt.parse(
            'a2d3fcf35dc37d26edaa77de11380ef3152939b15e8967c3a643ee83da33d9869a2d1d2663306e14629c999ad13545e6e62b0f12bad737edeb1bf26f400d850c3f36adc5fb84ad8ad6459ec51360f2c1d30068fb1e1df44698cf8be30097d8d4add4acb8591093546ac41421b41348b7d5bbe447fe235366995a974166986895',
            radix: 16));
    expect(
        privateKey.privateExponent,
        BigInt.parse(
            '8db5ab66eecaad484cfdd876b74baf8f15729c98666b75984c42c0f995d51c52ce29c73dda8392ba411c837ebee6fb603a1f6d6de2985e3fbd27c475d82c2c0698aa9b66da964072c1f5d488a3f61bb201429cecd2bfd9449f965d88b4d5ce8ed76934e1a0644cc5fd195adaadfe0c3090d40b4f6cc0bdce4badc91369bc58bd',
            radix: 16));
  });
}