Encrypting an API request with base64url and HmacSHA256

[ExcelCat]

I'm trying to automate data from DegreeDays.net. They have a requirement that the request string is encoded via base64url and a signature is encoded with HmacSHA256 : https://www.degreedays.net/api/json#send

You need to send five parameters to the endpoint URL (http://apiv1.degreedays.net/json or https://apiv1.degreedays.net/json😞

• request_encoding=base64url
• signature_method=HmacSHA256 (or alternative)
• signature_encoding=base64url
• encoded_request (the JSON string, base64url encoded)
• encoded_signature (the signature, base64url encoded)

I'm suprised that PowerAutomate doesn't have any encryption options - is there a way of me generating this information ?

[v-litu-msft · Accepted solution]

Hi @ExcelCat,

It's unfortunate that there is no action that could encrypt the code.

As a workaround, you could use the base64() function to encode it into the base64 code:

https://docs.microsoft.com/en-us/azure/logic-apps/workflow-definition-language-functions-reference#c...

But there is no function couldn't encode HmacSHA256 code, so this requirement maybe couldn't be satisfied in Flow.

Best Regards,
Community Support Team _ Lin Tu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[Jay-Encodian · Accepted solution]

Hi @ExcelCat 

Encodian are releasing the following action which covers this requirement: Create HMAC

I appreciate this is a third party connector, however there is a 'Free' subscription plan which may cover your throughput requirements.

HTH

Jay