OC Hash

using System;

using System.Security.Cryptography;

class MainClass {

static void Main() {

var apiKey = "67d594c6-9312-4df8-9b21-952cfdff1617";

var payload = new AuthenticationPayload

{

SourceSystemId = 1,

SourceSystemScenarioId = 1,

ReferenceId = "46436",

Nonce = Guid.NewGuid().ToString()

};

var hashCalc = new HashCalculator();

Console.WriteLine(payload.Nonce);

Console.WriteLine(hashCalc.CalculateHash(apiKey, payload.AsHashAuthenticationString));

}

}

public class AuthenticationPayload

{

public int SourceSystemId { get; set; }

public int SourceSystemScenarioId { get; set; }

public string ReferenceId { get; set; }

public string Nonce { get; set; }

public string AsHashAuthenticationString => $"{SourceSystemId}:{SourceSystemScenarioId}:{ReferenceId}:{Nonce}";

}

public class HashCalculator

{

public string CalculateHash(string key, string computedAuthenticationString)

{

if (string.IsNullOrWhiteSpace(key) || string.IsNullOrWhiteSpace(computedAuthenticationString))

{

return "";

}

var encoding = new System.Text.UTF8Encoding();

try

{

var keyByte = encoding.GetBytes(key);

var computedAuthenticationBytes = System.Text.Encoding.UTF8.GetBytes(computedAuthenticationString);

var encodedAuthenticationString = Convert.ToBase64String(computedAuthenticationBytes);

var computedHash = "";

using (var hmacsha256 = new HMACSHA256(keyByte))

{

var encodedAuthenticationStringBytes = encoding.GetBytes(encodedAuthenticationString);

var hashmessage = hmacsha256.ComputeHash(encodedAuthenticationStringBytes);

computedHash = ByteToString(hashmessage);

}

return computedHash;

}

catch (Exception ex)

{

return "";

}

}

private string ByteToString(byte[] buff)

{

string sbinary = "";

for (int i = 0; i < buff.Length; i++)

{

sbinary += buff[i].ToString("X2");

}

return (sbinary);

}

}