PCLCrypto

by AArnott

AArnott / PCLCrypto

Platform crypto for portable libraries

205 Stars 50 Forks Last release: over 4 years ago (v2.0.145) Microsoft Public License 821 Commits 30 Releases

Available items

No Items, yet!

The developer of this repository has not created any items for sale yet. Need a bug fixed? Help with integration? A different license? Create a request here:

PCLCrypto

PCLCrypto provides cryptographic APIs over algorithms implemented by the platform, including exposing them to portable libraries. PCLCrypto does not implement any crypto directly, thus making this library a good choice for applications that require the assurance of high quality crypto implementations that can most reliably be found within the operating system itself or hardware.

Build Status NuGet package Join the chat at https://gitter.im/AArnott/PCLCrypto

Features

  • Cryptographically strong random number generator
  • Symmetric and asymmetric encryption and signatures
  • Key derivation
  • Native crypto performance for each platform. This provides a 2-100X perf improvement for RSA on Android and iOS.
  • Streaming encryption on UAP, which goes beyond what the WinRT API itself offers (while still relying on the OS for the crypto implementation).
  • Support for multiple key formats (PKCS#1, PKCS#8, CAPI) on all platforms.

The API is designed to be similar to that found on WinRT or the .NET Framework. However some code changes may be required if migrating to this library from platform-specific crypto.

Installation

Add a dependency to this library into your project via the

PCLCrypto
NuGet package:

NuGet package

When using

packages.config
, you must be sure to install this package into each app project as well as any libraries in order to consume the right PCLCrypto.dll runtime library for the target platform. If you use
PackageReference
(preferred), this happens automatically.

Installing via NuGet is important because we use facade assemblies and platform-specific assemblies to allow your portable libraries to access crypto that is normally available only to platform-specific libraries using a technique Paul Betts calls Bait and switch PCLs. NuGet handles all the magic for you.

Documentation

Online documentation is available on our project wiki site.

Donations

If you appreciate this library and/or find it useful, please consider becoming a GitHub sponsor for its author or donating bitcoins to

1NC4k82nNev5Cz7ESBfaohbGsC6TKyjKvX
or any other mechanism shown on their Keybase profile.

FAQ

  1. Can I trust the crypto implemented in this library?

This library does not implement crypto. It merely provides .NET Standard-compatible APIs to invoke crypto, and at runtime the crypto offered by the platform is invoked. So you should be able to trust the crypto available through this library almost as much as you can trust the crypto in the operating system your application is already running on.

C# 6 Tip

One of the new features of C# 6 is using static, which bring static members of static classes into scope. You can take advantage of this feature with PCLCrypto to simplify your code:

Before:

...
using PCLCrypto;

class TwitterClient { private static string GenerateHash(string input, string key) { var mac = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha1); var keyMaterial = WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(key, Encoding.UTF8); var cryptoKey = mac.CreateKey(keyMaterial); var hash = WinRTCrypto.CryptographicEngine.Sign(cryptoKey, WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(input, Encoding.UTF8)); return WinRTCrypto.CryptographicBuffer.EncodeToBase64String(hash); } }

After:

...
using PCLCrypto;
using static PCLCrypto.WinRTCrypto;

class TwitterClient { private static string GenerateHash(string input, string key) { var mac = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha1); var keyMaterial = CryptographicBuffer.ConvertStringToBinary(key, Encoding.UTF8); var cryptoKey = mac.CreateKey(keyMaterial); var hash = CryptographicEngine.Sign(cryptoKey, CryptographicBuffer.ConvertStringToBinary(input, Encoding.UTF8)); return CryptographicBuffer.EncodeToBase64String(hash); } }

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.