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POSimple Hash that is always equal between C# and Java
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copied!<p>I have a C# WebService and a (Java) Android Application. Is there a SIMPLE hash function that produces the same result between these two languages? The simplest C# hash is a String.GetHashCode(), but I can't replicate it in Java. The simplest Java hash is not simple at all. And I don't know if I can replicate it exactly in C#. </p> <p>In case it's relevant, I'm hashing passwords before sending it across the internet. I'm currently using Encode64, but that's obviously not secure since we can reverse it.</p> <hr> <p>EDIT: Ok, I settled on using SHA256. Incase somebody else needs a quick solution, here are the code that I used, considering that I wanted both the C# and the Java to output the exact same string and I needed the simplest possible solution.</p> <p><strong>Java</strong> </p> <pre><code>public String Hash(String s) { StringBuffer sb = new StringBuffer(); try { MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update(s.getBytes()); byte byteData[] = md.digest(); for (int i = 0; i < byteData.length; i++) { sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16) .substring(1)); } } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return sb.toString(); } </code></pre> <p><strong>C#</strong></p> <pre><code>public static string Hash(String s) { HashAlgorithm Hasher = new SHA256CryptoServiceProvider(); byte[] strBytes = Encoding.UTF8.GetBytes(s); byte[] strHash = Hasher.ComputeHash(strBytes); return BitConverter.ToString(strHash).Replace("-","").ToLowerInvariant().Trim(); } </code></pre> <p>Thanks guys! :)</p>

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