Updox HMAC Authentication
Contents |
Description
For enhanced security, Updox provides an additional layer of authentication using a keyed-hash message authentication code (HMAC) with SHA1 as the cryptographic hash function. This document outlines how to use the Updox HMAC-SHA1 authentication.
Note: Updox HMAC-SHA1 enhances the Individual and Application Authorization schemes, it does not replace it. The auth header in the body of the post is still required for authorizing as a vendor, account, and user.
Outline
The Updox HMAC-SHA1 authentication layer requires two http header fields for every request:
1. updox-timestamp - the current time in the format "yyyy-MM-dd HH:mm:ss (z)".
2. Authorization - "HMAC " + the Base64 encoded HMAC SHA1 hash of the message with the secret key. Note the <SPACE> character following the letters HMAC.
The message is defined as:
[vendorId]:[vendorPassword]:[accountId]:[userId]:[updox-timestamp]
where :[accountId] and :[userId] are only required if/when they are provided in the auth block of the request JSON.
Verification
Updox will verify two things:
1. The timestamp header (updox-timestamp) is within the minutes defined for the vendor (e.g. 10 minutes).
2. The hash passed in matches the hash we compute (therefore, the message was signed with the secret key).
Code Samples
| Language | Source Code Examples |
|---|---|
| C# |
public void setHmacHeaders(HttpWebRequest request)
{
string applicationId = "vendor-id";
string applicationPassword = "vendor-password";
string accountId = "accountId";
string userId = "userId";
string apiSecret = "vendor-private-secret-key";
// Create the date string
String timestampString = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss") + " (GMT)"
// Build authentication string
string message =
applicationId + ":" +
applicationPassword + ":" +
accountId + ":" +
userId + ":" +
timestampString;
// Create the athentication hash - note the intentional <space> after HMAC
string auth = "HMAC " + hmacSha1ToBase64(message, apiSecret); //
// Set the request headers
request.Headers.Add("updox-timestamp", timestampString);
request.Headers.Add("Authorization", auth);
}
public string hmacSha1ToBase64(String value, String key)
{
// Get an hmac_sha1 key from the raw key bytes
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] valueBytes = Encoding.UTF8.GetBytes(value);
// Get an hmac_sha1 Mac instance and initialize with the signing key
HMACSHA1 myhmacsha1 = new HMACSHA1();
myhmacsha1.Key = keyBytes;
byte[] final = myhmacsha1.ComputeHash(valueBytes);
// Covert array of Hex bytes to a String
return Convert.ToBase64String(final);
}
|
| Java |
public static void generateHmacHeaders(HttpURLConnection connection, String applicationId, String applicationPassword, String accountId, String userId) throws Exception{
final SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss (z)");
d.setTimeZone(TimeZone.getTimeZone("GMT"));
final String timestampString = d.format(new Date());
final String message =
(applicationId == null ? "" : applicationId) + ":" +
(applicationPassword == null ? "" : applicationPassword) + ":" +
(accountId == null ? "" : accountId) + ":" +
(userId == null ? "" : userId) + ":" +
timestampString;
final String auth = "HMAC " + hmacSha1ToBase64(message, apiSecret); //note space after HMAC
connection.setRequestProperty("updox-timestamp", timestampString);
connection.setRequestProperty("Authorization", auth);
}
public static String hmacSha1ToBase64(String value, String key) throws Exception{
byte[] keyBytes = key.getBytes();
SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(value.getBytes());
byte[] base64Bytes = Base64.encodeBase64(rawHmac);
return new String(base64Bytes, "UTF-8");
}
|
Messages (Example)
Destination Address
Request and Response
Headers
updox-timestamp: 2013-11-20 17:36:00 (EST)
Authorization: HMAC fH2JyYwiERQbwXL4XF6ZvtLjRvQ=
Request
{
"auth": {
"applicationId": "updox",
"applicationPassword": "password",
"accountId": "100",
"userId": "100"
}
}
Response
{
"successful": true,
"responseMessage": "OK",
"responseCode": 2000
}
Relevant Response Codes
In addition to the General Error Set, this method may return the following values in the responseCode and responseMessage fields:
responseCode
|
responseMessage
|
|---|---|
4010
|
Unauthorized
|
