Authentication

An HTTP header is required to pass the authentication when performing the API request. The authentication requires a token to be used in the Authorization header of the HTTP request.

Authentication Token is a string sequence in the following format: "ASC pkey:datetime:hash", where

• pkey - random string,
• datetime - current UTC date and time in the "yyyyMMddHHmmss" format,
• hash - hash value for the string in the "datetime\npkey" format.

The hash value is calculated using the HMAC-SHA1 function with the key from the core.machinekey value of the Hosted Solution site appSettings configuration.

Please note, that the token is valid for 5 minutes only, starting with the datetime.

Authentication Token example will look like this: "ASC abc:20100707140603:E7lwEXOplYS-0lbnV1XQnDSbi3w"

Generating token examples

.Net(C#) generating token example

public string CreateAuthToken(string pkey, string machinekey)
{
    using (var hasher = new System.Security.Cryptography.HMACSHA1(System.Text.Encoding.UTF8.GetBytes(machinekey)))
    {
        var now = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
        var hash = System.Web.HttpServerUtility.UrlTokenEncode(hasher.ComputeHash(System.Text.Encoding.UTF8.GetBytes(string.Join("\n", now, pkey))));

        return string.Format("ASC {0}:{1}:{2}", pkey, now, hash);
    }
}

Bash generating token example

CreateAuthToken() {
    pkey="$1";
    machinekey=$(echo -n "$2");
    now=$(date +"%Y%m%d%H%M%S");

    authkey=$(echo -n -e "${now}\n${pkey}" | openssl dgst -sha1 -binary -mac HMAC -macopt key:$machinekey | sed -e 's/^.* //');
    authkey=$(echo -n "${authkey}" | base64);

    echo "ASC ${pkey}:${now}:${authkey}";
}

Node.js generating token example

import crypto from "node:crypto"
import moment from "moment"

function createToken(pkey, machinekey) {
  const now = moment.utc().format("YYYYMMDDHHmmss")

  let authkey = crypto.createHmac("sha1", machinekey).update(`${now}\n${pkey}`).digest("base64")

  authkey = authkey.replaceAll("+", "-").replaceAll("/", "_")
  authkey = authkey.slice(0, Math.max(0, authkey.length - 1))
  const hash = `ASC ${pkey}:${now}:${authkey}`

  return hash
}

PHP generating token example

<?php
function CreateAuthToken($pkey, $machinekey) {
    $now=gmdate('YmdHis');

    $authkey=hash_hmac('sha1', $now."\n".$pkey, $machinekey, true);
    $authkey=base64_encode($authkey);
    $authkey=str_replace(array("+", "/"), array("-", "_"), substr($authkey, 0, -1)).'1';

    return 'ASC '.$pkey.':'.$now.':'.$authkey;
}
?>

PowerShell generating token example

function CreateAuthToken([string]$pkey, [string]$machinekey) {
    $hmacsha = New-Object System.Security.Cryptography.HMACSHA1
    $hmacsha.Key = [System.Text.Encoding]::UTF8.GetBytes($machinekey)

    [string]$now=(Get-Date -format "yyyyMMddHHmmss")
    [string]$hash = [System.Convert]::ToBase64String([byte[]]$hmacsha.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($now + "`n" + $pkey)))
   
    $hash = $hash.Replace('+', '-')
    $hash = $hash.Replace('/', '_')

    return "ASC {0}:{1}:{2}" -f $pkey, $now, $hash
}

Ruby generating token example

def create_auth_token(pkey, machine_key)
    now = Time.now.strftime('%Y%m%d%H%M%S')
    hash = Base64.strict_encode64(OpenSSL::HMAC.digest('sha1', machine_key, [now, pkey].join("\n")))
    "ASC #{pkey}:#{now}:#{hash.tr('+', '-').tr('/', '_').chop}"
end

Python generating token example

import base64
import hashlib
import hmac

from datetime import datetime, date, time

def create_auth_token(pkey, machine_key):

    machine_key = bytes(machine_key, 'UTF-8')
    now = datetime.strftime(datetime.utcnow(), "%Y%m%d%H%M%S")

    message = bytes('{0}\n{1}'.format(now, pkey), 'UTF-8')

    _hmac = hmac.new(machine_key, message, hashlib.sha1)
        
    signature = str(base64.urlsafe_b64encode(_hmac.digest()), 'UTF-8')
    signature = signature.replace('-', '+')
    signature = signature.replace('_', '/')
    token = 'ASC {0}:{1}:{2}'.format(pkey, now, signature)

    return token

Java generating token example

public String createAuthToken(String pkey, String machinekey) throws Exception
{
    java.time.OffsetDateTime date = java.time.OffsetDateTime.now(java.time.ZoneOffset.UTC);
    String time = date.format(java.time.format.DateTimeFormatter.ofPattern("YYYYMMddHHmmss"));
    String data = time + "\n" + pkey;

    javax.crypto.spec.SecretKeySpec signingKey = new javax.crypto.spec.SecretKeySpec(machinekey.getBytes(), "HmacSHA1");

    javax.crypto.Mac mac = javax.crypto.Mac.getInstance("HmacSHA1");
    mac.init(signingKey);
    String hash = java.util.Base64.getUrlEncoder().encodeToString(mac.doFinal(data.getBytes()));

    return String.format("ASC %1$s:%2$s:%3$s", pkey, time, hash);
}