AWS API Dlang, hmac sha256 function.

[Rikki Cattermole via Digitalmars-d-learn]

On 04/10/15 1:09 AM, holo wrote:
> On Saturday, 3 October 2015 at 05:02:58 UTC, Rikki Cattermole wrote:
>> On 03/10/15 6:01 PM, Rikki Cattermole wrote:
>>> On 03/10/15 4:54 PM, holo wrote:
>>>> On Saturday, 3 October 2015 at 03:15:21 UTC, Rikki Cattermole wrote:
>>>>>
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> Thank you for answer. I used dub to fetch botan, after that i created
>>>> project:
>>>>
>>>> dub init projectname botan
>>>>
>>>> and tried to add botan module:
>>>>
>>>> $ cat app.d
>>>> #!/usr/bin/rdmd
>>>>
>>>> import std.stdio;
>>>> import botan.mac.hmac;
>>>>
>>>> void main()
>>>> {
>>>>      writeln("Edit source/app.d to start your project.");
>>>> }
>>>>
>>>> but when im trying to run my simple app i get:
>>>>
>>>> $ ./app.d
>>>> ./app.d(4): Error: module hmac is in file 'botan/mac/hmac.d' which
>>>> cannot be read
>>>> import path[0] = .
>>>> import path[1] = /usr/include/dlang/dmd
>>>> Failed: ["dmd", "-v", "-o-", "./app.d", "-I."]
>>>>
>>>> What am i doing wrong? How to add library with dub package manager? Im
>>>> really beginner in D (basically in programming) sorry if im asking
>>>> obvious questions.
>>>
>>> By the looks of that error message with paths, botan isn't actually
>>> added as a dependency. Can you please paste the dub file?
>>
>> Ohhhh wait nevermind.
>> Use dub to compile/run your program. You are using the shebang line!
>>
>> $ dub run
>>
>>>> According to my other question are that functions equivalent to that
>>>> python one? If they are not doing exact that same i could not create
>>>> auth string which is needed to connect to AWS api.
>>>
>>> I can't say for certain if it is not exact. The reason I did not answer
>>> it is because I am not familiar with environment or any of what you are
>>> doing.
>>> I can unfortunately only point you in the right direction.
>
> Thank you for explaining how to use dub.
>
> I find out in master branch of phobos on git hub is included hmac.d
> module which will be added in next release of phobos so i think that
> will be best solution for me to stick with standard library for beginning.
>
> https://github.com/D-Programming-Language/phobos/tree/master/std
>
> I downloaded hmac.d and new version of digest.d file and place them in
> my phobos library. I think it exactly contains what i need but when im
> trying to test it i have such error:
>
> $ ./app.d
> ./app.d(9): Error: template std.digest.hmac.hmac cannot deduce function
> from argument types !(SHA!(512, 256))(immutable(ubyte)[]), candidates are:
> /usr/include/dlang/dmd/std/digest/hmac.d(202): std.digest.hmac.hmac(H)
> if (isDigest!H && hasBlockSize!H)
> /usr/include/dlang/dmd/std/digest/hmac.d(208): std.digest.hmac.hmac(H,
> ulong blockSize)(scope const(ubyte)[] secret) if (isDigest!H)
> Failed: ["dmd", "-v", "-o-", "./app.d", "-I."]
>
>
>
> My test code (based on unint test from module) looks like that:
>
> #!/usr/bin/rdmd
>
> import std.stdio;
> import std.digest.sha, std.digest.hmac;
> import std.string : representation;
>
> void main()
> {
>      auto hmac = hmac!SHA256("secretkey".representation);
>      auto digest = hmac.put("texttohash".representation).finish;
>      writeln(digest);
> }
>
> Am i using it correctly?

By the looks of things the problem is with SHA256, I'm guessing it 
doesn't have its block size defined.
https://github.com/D-Programming-Language/phobos/blob/master/std/digest/digest.d#L394
You'll also need to update sha.d as well. Otherwise it looks good.