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Due to the fact that the error is already indicating that NHibernate does not support that feature. I would create a named query and solve the equation within a query. I have tested it with MySQL (using a common username and password comparison as example) and the following statement returns the desired row (password is a BINARY(32) field): <pre><code>SELECT * FROM `user` WHERE `password` = MD5('test'); </code></pre> Using MSSQL you can do: <pre><code>SELECT * FROM [user] WHERE [password] = HASHBYTES('MD5', 'test') </code></pre> So to extend this to a named query you would create an .hbm.xml file like 'User.hbm.xml' with the following content: <pre><code><?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="My.Model" namespace="My.Model"> <sql-query name="GetUserByCredentials"> <return class="My.Model.User, My.Model" /> <![CDATA[ SELECT * FROM User WHERE Username = :Username AND Password = MD5(:Password) ]]> </sql-query> </hibernate-mapping> </code></pre> To configure this I used Fluent NHibernate but something similar would be possible with just plain NHibernate: <pre><code>Fluently.Configure() .Database(MySqlConfiguration.Standard .ConnectionString(x => x.FromConnectionStringWithKey("Test")) .AdoNetBatchSize(50)) .Cache(c => c .UseQueryCache() .ProviderClass<HashtableCacheProvider>()) .Mappings(m => { m.FluentMappings.AddFromAssemblyOf<IHaveFluentNHibernateMappings>().Conventions.Add(ForeignKey.EndsWith("Id")); m.HbmMappings.AddFromAssemblyOf<IHaveFluentNHibernateMappings>(); }) .BuildConfiguration(); </code></pre> This statement looks for the ".hbm.xml" files in the assembly with the interface named "IHaveFluentNHibernateMappings" With this in place you can do the following at session level: <pre><code>public User GetUserByCredentials(string username, string password) { IQuery query = Session.GetNamedQuery("GetUserByCredentials"); query.SetParameter("Username", username); query.SetParameter("Password", password); return query.UniqueResult<User>(); } </code></pre> And by calling the the GetUserByCredentials method, the custom query will be executed. As you can see password is a string, so you need to convert your MD5 byte array to a string first by using: <pre><code>System.Text.StringBuilder s = new System.Text.StringBuilder(); foreach (byte b in md5ByteArray) { s.Append(b.ToString("x2").ToLower()); } password = s.ToString(); </code></pre> Good luck!
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1. COI was hoping for a simpler solution using Linq, but your solution would work.
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2. COBy the way, you might be interested in [`BitConverter.ToString`](http://msdn.microsoft.com/en-us/library/3a733s97.aspx) to convert a `byte[]` to a `string`.
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