Calculate hash from full (RAW) request body

New to APIs/Postman
1

Hi,
I’m quite new to Postman, so sorry if I ask question that was answered before (I didn’t found anything similar).
I’m trying to implement HMAC authentication schema for my requests.
As part of hash I need to calculate I need MD5 from body.
I’ve posted same question on Stackoverflow but I was asked by @singhsivcan to post that question in Postman community.

When I do GET request everything works fine, but when I form-data with files I can’t calculate MD5 from body, because I don’t have access to it.
Please take a look at my github issue.

How can this be done right now inside Postman native app? Is this even possible?

2

As mentioned by @kamalaknn in this comment, we do not allow access to the request body with the file contents in the pre-request scripts.

Just wanted to specify here in case other people stumble upon this issue here.

3

@deepak.pathania so how can I solve this?
Any plans to add this as supported (build in) authentication method?

4

We do have plans to support custom authentication methods, this would most certainly be handled by that. Unfortunately, we do not intend to support this as a built-in authentication method for the reasons explained in the GitHub thread.

5

@deepak.pathania any news about custom authentication methods?
Currently, I have C# app just to test that HMAC authentication and I would like to replace that with Postman.