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PODifferent encoding using "android.util.Base64" and "org.apache.commons.codec.binary.Base64;"
 

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    <p>I am programming an authentication service in Android and this one includes a server part written in java. I do the same operations in both parts executing these two pieces of codes in Android and Server:</p> <p>ANDROID:</p> <pre><code>String genChallengeResponse(String challenge, String message) { String Hmac_ALG = "HmacSHA256"; SecretKey key = new SecretKeySpec(challenge.getBytes(), Hmac_ALG); Mac m = Mac.getInstance(Hmac_ALG); m.init(key); m.update(password.getBytes()); byte[] mac = m.doFinal(); return new String(Base64.encode(mac, Base64.DEFAULT)); } </code></pre> <p>SERVER:</p> <pre><code>String genChallengeResponse(String challenge, String message) { String Hmac_ALG = "HmacSHA256"; SecretKey key = new SecretKeySpec(challenge.getBytes(), Hmac_ALG); Mac m = Mac.getInstance(Hmac_ALG); m.init(key); m.update(password.getBytes()); byte[] mac = m.doFinal(); return new String(Base64.encodeBase64(mac)); } </code></pre> <p>Starting from the same challenge and message these are the results:</p> <pre> Android: n2EaLpQr0uKgkZKhCQzwuIFeeLjzZKerZcETVNcfla4= Server: n2EaLpQr0uKgkZKhCQzwuD9eeLjzZKerZcETVNcfla4= ^^ </pre> <p>These are different just for TWO CHARACTERS. The problem is that this strange behaviour does not appear in every pair of String passed to the functions...</p> <p>I tried to use the UTF-8 in each system, but nothing changes... Do someone knows what is the problem? If this is a known problem...</p> <p>(is important to say that the problem is the same using Android 2.2 or also 4.0, then the problem is not the operating system, I think).</p>
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