Databases
StackOverflow2013
Postsdbo
POHow to generate an HMAC in Java equivalent to a Python example?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to generate an HMAC in Java equivalent to a Python example?
    primarykey
    data
    text
    <p>I'm looking at implementing an app getting <a href="http://apiwiki.twitter.com/Authentication" rel="noreferrer">Twitter authorization via Oauth</a> in Java. The first step is <a href="http://apiwiki.twitter.com/Twitter-REST-API-Method%3A-oauth-request_token" rel="noreferrer">getting a request token</a>. Here is a <a href="http://github.com/tav/tweetapp/blob/master/standalone/twitter_oauth_handler.py" rel="noreferrer">Python example</a> for app engine. </p> <p>To test my code, I am running Python and checking output with Java. Here is an example of Python generating a Hash-Based Message Authentication Code (HMAC):</p> <pre><code>#!/usr/bin/python from hashlib import sha1 from hmac import new as hmac key = "qnscAdgRlkIhAUPY44oiexBKtQbGY0orf7OV1I50" message = "foo" print "%s" % hmac(key, message, sha1).digest().encode('base64')[:-1] </code></pre> <p>Output:</p> <pre><code>$ ./foo.py +3h2gpjf4xcynjCGU5lbdMBwGOc= </code></pre> <p>How does one replicate this example in Java?</p> <p>I've seen an <a href="http://exampledepot.8waytrips.com/egs/javax.crypto/GenMac.html" rel="noreferrer">example of HMAC</a> in Java:</p> <pre><code>try { // Generate a key for the HMAC-MD5 keyed-hashing algorithm; see RFC 2104 // In practice, you would save this key. KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5"); SecretKey key = keyGen.generateKey(); // Create a MAC object using HMAC-MD5 and initialize with key Mac mac = Mac.getInstance(key.getAlgorithm()); mac.init(key); String str = "This message will be digested"; // Encode the string into bytes using utf-8 and digest it byte[] utf8 = str.getBytes("UTF8"); byte[] digest = mac.doFinal(utf8); // If desired, convert the digest into a string String digestB64 = new sun.misc.BASE64Encoder().encode(digest); } catch (InvalidKeyException e) { } catch (NoSuchAlgorithmException e) { } catch (UnsupportedEncodingException e) { } </code></pre> <p>It uses <a href="http://download.oracle.com/docs/cd/E17409_01/javase/6/docs/api/javax/crypto/Mac.html" rel="noreferrer">javax.crypto.Mac</a>, all good. However, the <a href="http://download.oracle.com/docs/cd/E17409_01/javase/6/docs/api/javax/crypto/SecretKey.html" rel="noreferrer">SecretKey</a> constructors take bytes and an algorithm. </p> <p>What's the algorithm in the Python example? How can one create a Java secret key without an algorithm?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USdfrankow
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTDuplicate
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to generate an HMAC in Java equivalent to a Python example?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow to generate an HMAC in Java equivalent to a Python example?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to generate an HMAC in Java equivalent to a Python example?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload