steel_crypt 0.3.2+1

A collection of high-level API's exposing crypto/encrypt to perform hashing and encrypting in popular/secure algorithms.

Steel Crypt

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General

A simple library of high-level API's and sugar for crypto/encrypt. This library currently supports hashing, two-way encryption, and key/IV generation:

2-Way Symmetric (class SymCrypt)

• AES with PKCS7 Padding ('AES') (Default)
• Salsa20 ('Salsa20')
• More planned...
• Note: AES requires 16 bytes of IV, whereas Salsa 20 requires 8

2-Way Asymmetric (class RsaCrypt)

• RSA
• Note: RsaCrypt is non-traditional. It auto-generates keys and stores them. However, it requires authentication text on the user end to work correctly.

Hashing (class HashCrypt)

• SHA-256 ('sha256') (Default)
• SHA-1 ('sha1')
• MD5 ('md5')
• Note: HMAC + key can be added to any of the above using the .hashHMAC(input, key) function.
• Note: Compare plaintext to hashtext using .checkpass(plain, hashed) and .checkpassHMAC(plain, hashed, key)

Key/IV Generation (class CryptKey)

• Generates cryptographically secure keys + IV's
• Keys default to length 32, IV's to length 16

Usage

A simple usage example:

import 'package:steel_crypt/steel_crypt.dart';

main() {

  var private = CryptKey().genKey();

  var public = CryptKey().genKey();


  var encrypter = SymCrypt(private, 'AES');

  var encrypter2 = RsaCrypt();


  var hasher = HashCrypt('sha256');

  var hasher2 = HashCrypt('md5');


  var iv = CryptKey().genIV(16);



  print(private);


  print(hasher.hash('word'));

  var hash = hasher.hash('word');

  print(hasher.checkpass('word', hash));


  print(hasher.hashHMAC('word', private));


  print(encrypter.encrypt('word', iv));

  String crypted = encrypter.encrypt('word', iv);

  print(encrypter.decrypt(crypted, iv));



  var crypted2 = encrypter2.encrypt('word', "This is authentication text...");

  print(encrypter2.getString(crypted2));

  print(encrypter2.decrypt(crypted2));

}

Notes

• Use in production AT YOUR OWN RISK.
• This is a work-in-progress, but will be actively maintained.
• Please file feature requests and bugs at the issue tracker.
• I'm busy, so file a PR for new features if possible...

TODO's

• Create Project + add "Starter Set" of algorithms
• Add more, different 2-way encryption algorithms + packaging options
• Tackle adding an RSA solution OR expose encrypt's RSA
• Create a more complete password solution
• Add more detailed example

Reading

• Look at these links for further information on ciphers, hashes, and terminology used here:
  • [https://en.wikipedia.org/wiki/Salsa20]
  • [https://en.wikipedia.org/wiki/Advanced_Encryption_Standard]
  • [https://en.wikipedia.org/wiki/RSA_(cryptosystem)]
  • [https://en.wikipedia.org/wiki/SHA-2]
  • [https://en.wikipedia.org/wiki/SHA-1]
  • [https://en.wikipedia.org/wiki/MD5]
  • [https://en.wikipedia.org/wiki/HMAC]
  • [https://en.wikipedia.org/wiki/PKCS_1]
  • [https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS#5_and_PKCS#7]
  • [https://en.wikipedia.org/wiki/Initialization_vector]
  • [https://en.wikipedia.org/wiki/Cryptographic_hash_function]
  • [https://en.wikipedia.org/wiki/Symmetric-key_algorithm]
  • [https://en.wikipedia.org/wiki/Public-key_cryptography]

Licensed under the Mozilla Public License 2.0