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copied!<p>MD5 and SHA1 rely on native implementaions, nonetheless its possible a C++ solution + introp could be slightly faster, cause you could possibly reduce the number of method calls a bit and optimize the native implementation. </p> <p>Keep in mind that the Native (SHA1CryptoServiceProvider) can be 3X faster than the managed one(SHA1Managed).</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; using System.Security.Cryptography; namespace ConsoleApplication22 { class Program { static void Profile(string description, int iterations, Action func) { // clean up GC.Collect(); GC.WaitForPendingFinalizers(); GC.Collect(); // warm up func(); var watch = Stopwatch.StartNew(); for (int i = 0; i < iterations; i++) { func(); } watch.Stop(); Console.Write(description); Console.WriteLine(" Time Elapsed {0} ms", watch.ElapsedMilliseconds); } static void Main() { SHA1Managed managed = new SHA1Managed(); SHA1CryptoServiceProvider unmanaged = new SHA1CryptoServiceProvider(); Random rnd = new Random(); var buffer = new byte[100000]; rnd.NextBytes(buffer); Profile("managed", 1000, () => { managed.ComputeHash(buffer, 0, buffer.Length); }); Profile("unmanaged", 1000, () => { unmanaged.ComputeHash(buffer, 0, buffer.Length); }); Console.ReadKey(); } } } </code></pre> <pre> managed Time Elapsed 891 ms unmanaged Time Elapsed 336 ms </pre> <p><strong>Also Keep in mind</strong> unless my calculation is wrong, the unmanaged implementation is hashing 100MB of data in about 300 milliseconds, this would very rarely be a bottleneck. </p>

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