AWS API Dlang, hmac sha256 function.

[Rikki Cattermole via Digitalmars-d-learn]

On 03/10/15 4:11 PM, holo wrote:
> Hello
>
> I'm trying to contact AWS API with D according to documentation:
>
> http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html
>
> there is written example in python which i want to rewrite to D:
>
> http://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html
>
>
> I want to ask about such 2 things:
>
> Is it equivalent in D:
>
> hexDigest!SHA256("sometexttohash");
>
> for such python method:
>
> hashlib.sha256('sometexttohash').hexdigest()
>
> ?
>
> Maybe is there some prettier solution in D eg:
>
> toHexString(sha256Of("sometexttohash"));
>
> or
>
> SHA256 sha;
> sha.start();
> string data = "sometexttohash";
> sha.put(data);
> toHexString(sha.finish())
>
> If those are equivalents to python method which should i choose?
>
> Last but not least, how to write such function in D:
>
> def sign(key, msg):
>      return hmac.new(key, msg.encode("utf-8"), hashlib.sha256).digest()
>
> ?
>
> I can't find in standard libraryt hmac function, is it existing?
>
> //holo

You could implement it yourself, (it looks pretty easy).
Or go the route of Botan: 
https://github.com/etcimon/botan/blob/3bdc835d5b9bad7523deaa86fe98b1fbb2f09d6b/source/botan/mac/hmac.d