I want to connect to Azure Blob Storage

Can you share more details?

Hi Stefan, 

I have a storage account for eg myaccount , a container mycontainer . 

I am using the URL https://myaccount.blob.core.windows.net/mycontainer/ where Note.png is a blob i am trying to get.

In the Headers I have 3 headers

• Authorization with Value "Shared Key myaccount:<hmacSignature>" where hmac signature is canonicalized signature created by following steps in azure documentation. in this hmac signature i am paaing the blob name , processing date and httpVerb.
• x-ms-date with Value hard coded date time every time i test or the now() function
• x-ms-version with Value 2015-04-05

and when i test this i come up with this error.

Hi  I tried encrypting Authorization header > signature in C# , that signature works well in integration . But if I try similar code in Appian expression rule, Its giving that error. Can you help please? 

C# code thats working -
using System;
using System.Text;
using System.Security.Cryptography;

public class HelloWorld
{
string signWithAccountKey(string stringToSign, string accountKey)
{
var hmacsha = new System.Security.Cryptography.HMACSHA256();
hmacsha.Key = Convert.FromBase64String(accountKey);
var signature = hmacsha.ComputeHash(Encoding.UTF8.GetBytes(stringToSign));
return Convert.ToBase64String(signature);
}
public static void Main(string[] args)
{
HelloWorld h = new HelloWorld();
Console.WriteLine (h.signWithAccountKey("GET\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Thu, 22 Feb 2024 12:51:11 GMT\nx-ms-version:2015-04-05\n/myblobstorage/myContainer/Note.png","Access Key"));
}
}

Appian alternate created for same but not generating same key as C# code

a!localVariables(

local!signatureString:"GET\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:Thu, 22 Feb 2024 12:51:11 GMT\nx-ms-version:2015-04-05\n/myblobstorage/myContainer/Note.png",
local!base64Key: decodebase64string(cons!AS_SHARED_KEY2),
local!unicodeSign:code(local!signatureString),
local!hashKey: hmacsha256hash(local!base64Key,local!unicodeSign),
local!base64EncodedSign:encodebase64string(local!hashKey),
{
touniformstring(local!base64EncodedSign)
}
)

The issue is, that keys exist in a few variants. As plain string, base64 encoded string, binary, base64 encoded binary and maybe more. The plugin in Appian can only work with specific key formats. I suggest to check the plugin source code to understand how this works. That is at least what helped me.