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POHMAC-SHA1: How to do it properly in Java?
 

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    <p>I'm hashing some values using HMAC-SHA1, using the following code in Java:</p> <pre><code>public static String hmacSha1(String value, String key) { try { // Get an hmac_sha1 key from the raw key bytes byte[] keyBytes = key.getBytes(); SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1"); // Get an hmac_sha1 Mac instance and initialize with the signing key Mac mac = Mac.getInstance("HmacSHA1"); mac.init(signingKey); // Compute the hmac on input data bytes byte[] rawHmac = mac.doFinal(value.getBytes()); // Convert raw bytes to Hex byte[] hexBytes = new Hex().encode(rawHmac); // Covert array of Hex bytes to a String return new String(hexBytes, "UTF-8"); } catch (Exception e) { throw new RuntimeException(e); } } </code></pre> <p><code>Hex()</code> belongs to <code>org.apache.commons.codec</code></p> <p>In PHP there's a similar function <code>hash_hmac(algorithm, data, key)</code> that I use to compare the values returned by my Java implementation.</p> <p>So the first try is:</p> <pre><code>hash_hmac("sha1", "helloworld", "mykey") // PHP </code></pre> <p>that returns: <code>74ae5a4a3d9996d5918defc2c3d475471bbf59ac</code></p> <p>My Java function returns <code>74ae5a4a3d9996d5918defc2c3d475471bbf59ac</code> as well.</p> <p>Ok, it seems working. Then I try to use a more complex key:</p> <pre><code>hash_hmac("sha1", "helloworld", "PRIE7$oG2uS-Yf17kEnUEpi5hvW/#AFo") // PHP </code></pre> <p>that returns: <code>e98bcc5c5be6f11dc582ae55f520d1ec4ae29f7a</code></p> <p>While this time my Java impl returns: <code>c19fccf57c613f1868dd22d586f9571cf6412cd0</code></p> <p>The hash returned by my PHP code is not equal to the value returned by my Java function, and I can't find out why.</p> <p>Any tips?</p>
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