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POCompute SHA256 Hash in Android/Java and C#
 

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    <p>I am trying to generate a SHA256 hash in android, that I then pass to an ASP.NET Web API web service and compare the hash there. As such, I need to construct a hash in Android, that given the same inputs in ASP.NET will generate an equivalent hash. I'm pulling my hair out trying to figure out what I'm doing wrong.</p> <p>Here's the Android code:</p> <pre><code>public String computeHash(String input) throws NoSuchAlgorithmException{ MessageDigest digest = MessageDigest.getInstance("SHA-256"); digest.reset(); try{ digest.update(input.getBytes("UTF-8")); } catch (UnsupportedEncodingException e){ e.printStackTrace(); } byte[] byteData = digest.digest(input.getBytes()); StringBuffer sb = new StringBuffer(); for (int i = 0; i &lt; byteData.length; i++){ sb.append(Integer.toString((byteData[i] &amp; 0xff) + 0x100, 16).substring(1)); } return sb.toString(); } </code></pre> <p>AND HERE's THE CODE ON THE SERVER (c#):</p> <pre><code> private static string ComputeHash(string input, HashAlgorithm algorithm) { Byte[] inputBytes = Encoding.UTF8.GetBytes(input); Byte[] hashedBytes = algorithm.ComputeHash(inputBytes); StringBuilder sb = new StringBuilder(); for (int i = 0; i &lt; hashedBytes.Length; i++) { sb.Append(String.Format("{0:x2}", hashedBytes[i])); } return sb.ToString(); } </code></pre> <p><strong>UPDATE:</strong> Here is the corrected Android/Java implementation (thank you Nikolay Elenkov):</p> <pre><code>public String computeHash(String input) throws NoSuchAlgorithmException, UnsupportedEncodingException{ MessageDigest digest = MessageDigest.getInstance("SHA-256"); digest.reset(); byte[] byteData = digest.digest(input.getBytes("UTF-8")); StringBuffer sb = new StringBuffer(); for (int i = 0; i &lt; byteData.length; i++){ sb.append(Integer.toString((byteData[i] &amp; 0xff) + 0x100, 16).substring(1)); } return sb.toString(); } </code></pre>
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    1. COI can't believe how much time you guys saved me today. Thanks for posting the update.
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