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POJava MessageDigest and .NET SHA1Managed - hashes not matching
 

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  1. POJava MessageDigest and .NET SHA1Managed - hashes not matching
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    <p>I have some .net code that generates a SHA1 hash on an xml document and need it to match a SHA1 hash generated on the same xml document in java code. The xml doc is sent to the java system and they generate a hash and match against the one i send to verify they are getting the document I intended them to. Below are the snippets in use for this and they both consistently generate the same different hashes. Any ideas why the following code would not generate the same hash?</p> <p>.NET</p> <pre><code> String fileName = @"D:\Projects\CHIEP\hasherror\cdadoc.xml"; byte[] buff = null; FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); long numBytes = new FileInfo(fileName).Length; buff = br.ReadBytes((int)numBytes); HashAlgorithm hash = new SHA1Managed(); byte[] hashBytes = hash.ComputeHash(buff); string hex = BitConverter.ToString(hashBytes); hex = hex.Replace("-", "").ToLower(); </code></pre> <p>Java</p> <pre><code>public static String SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException { MessageDigest md; md = MessageDigest.getInstance("SHA-1"); byte[] sha1hash = new byte[40]; md.update(text.getBytes("UTF-8"), 0, text.length()); sha1hash = md.digest(); //String converted = convertToHex(sha1hash); String converted = getHexString(sha1hash); return converted; } </code></pre> <p>.NET output <br/> 587691443778c1da54c3fd04bb35ec68a5a7fecd</p> <p>Java output:<br/> 89665a8268d7d1901aba529dc8c9cea0f910c1bd</p> <p>The input is a UTF-8 encoded CDA document that gets created here:</p> <pre><code> XmlSerializer serializer = new XmlSerializer(obj.GetType()); System.IO.MemoryStream memoryStream = new System.IO.MemoryStream(); XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, new UTF8Encoding(false)); XmlDocument xmlDoc = new XmlDocument(); serializer.Serialize(xmlTextWriter, obj); memoryStream = (System.IO.MemoryStream)xmlTextWriter.BaseStream; String xml = UTF8Encoding.UTF8.GetString(memoryStream.ToArray()); </code></pre> <p>UPDATE:</p> <p>Getting close to a solution. I found in the document there is a character that is being interpreted differently in the java than in the .net code. </p> <p>Java reads in this:</p> <pre><code>value="21.9456" unit="kg/m²" </code></pre> <p>.net reads in this:</p> <pre><code>value="21.9456" unit="kg/m²" </code></pre> <p>If I open in the xml editor of my choice it looks like the what .net reads in. I suspect it has something to do with java doing a conversion and .net simply assuming..</p>
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    1. COCan you share the strings produced by the .NET and the Java versions? Also, I see that your Java version converts the string to UTF-8 to get a byte sequence, but your .NET version just assumes that the content in the file has the same byte sequence as some in-memory string converted to UTF-8 representation. What is the file's encoding?
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    2. COupdated original post.
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    3. COTake the outputted XML string that you generated and run a diff. I bet the output is different
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