Add SHA-512 support to the crypto library

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1046115?v=3" align="left" width="96" height="96"hspace="10"> Issue by jwendel
Originally opened as dart-lang/sdk#9822

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What steps will reproduce the problem?
The current crypto library only supports SHA-1 and a limited subset of SHA-2 (SHA-256). While this may be enough for client-side, it would be nice to have full SHA-2 support for server-side development. This would mean support for all SHA-2 algorithms: (SHA-224, SHA-256, SHA-384, SHA-512).

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?
Dart SDK version 0.4.5.1_r21094

Please provide any additional information below.
I was looking to write a server-side program that talked to a RESTful service, but it required that all requests had a SHA-512 signature, which is not currently supported by the included Dart crypto library. I could also see this being needed for anyone doing a server-side Dart app that wants to store SHA-512 versions of users passwords.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Removed Type-Defect label.
Added Type-Enhancement, Area-Library, Library-Crypto, PatchesWelcome, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1046115?v=3" align="left" width="48" height="48"hspace="10"> Comment by jwendel

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I'm working on these changes. I have SHA-224 and SHA-512 added and working. I have a bit of work to get all the tests added that I need/want to do.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Removed Library-Crypto label.
Added Pkg-Crypto label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Removed Area-Library label.
Added Area-Pkg label.

[gurmukhp]

Any update on this?

[Solido]

This would be more than welcome since more and more API require this level of security.

[yshrsmz]

Trying to implement this in my project, but something is wrong 🤔
Could anyone guide me to the right direction?
I'm thinking about sending PR, once it's completed.

https://github.com/yshrsmz/bip39-dart/blob/58f51d08166929c4fb7612871e4e3506a5c2a3d1/lib/src/sha512.dart

it's based on https://github.com/jwendel/dart-sha-2

[SoptikHa2]

How is it going @yshrsmz ? Can I use the sha512.dart file in my project, is it ready?

[yshrsmz]

@SoptikHa2 Sadly no, but I'm now using https://github.com/PointyCastle/pointycastle/
It was not Dart2 compatible at that time, but now it is.

[jtmcdole]

Should be resolved!