Skip to main content

BCrypt.net - Strong Password Hashing for .NET and Mono

Using raw hash functions to authenticate passwords is as naive as using unsalted hash functions. Don’t.
Thomas Ptacek
BCrypt.net is an implementation of OpenBSD's Blowfish-based password hashing code, described in "A Future-Adaptable Password Scheme" by Niels Provos and David Mazières. It is a direct port of jBCrypt by Damien Miller, and is thus released under the same BSD-style license. The code is fully managed and should work with any little-endian CLI implementation -- it has been tested with Microsoft .NET and Mono.

Why BCrypt?

Most popular password storage schemes are based on fast hashing algorithms such as MD5 and SHA-1. BCrypt is a computationally expensive adaptive hashing scheme which utilizes the Blowfish block cipher. It is ideally suited for password storage, as its slow initialization time severely limits the effectiveness of brute force password cracking attempts. How much overhead it adds is configurable (that's the adaptive part), so the computational resources required to test a password candidate can grow along with advancements in hardware capabilities.

Usage

Using BCrypt in your code is very simple:
// Pass a logRounds parameter to GenerateSalt to explicitly specify the
// amount of resources required to check the password. The work factor
// increases exponentially, so each increment is twice as much work. If
// omitted, a default of 10 is used.
string hashed = BCrypt.HashPassword(password, BCrypt.GenerateSalt(12));

// Check the password.
bool matches = BCrypt.CheckPassword(candidate, hashed);
The source code is available via the links below. You can download the packaged version, which includes an NUnit-based test suite, or download the source directly via BCrypt.cs.

Attachments


-----------------------------

Comments

Post a Comment

Popular posts from this blog

C# Generic class to parse value - "GenericConverter"

    public class GenericConverter     {         public static T Parse<T>(string sourceValue) where T : IConvertible         {             return (T)Convert.ChangeType(sourceValue, typeof(T));         }         public static T Parse<T>(string sourceValue, IFormatProvider provider) where T : IConvertible         {             return (T)Convert.ChangeType(sourceValue, typeof(T), provider);         }     }     public static class TConverter     {         public static T ChangeType<T>(object value)         {             return (T)ChangeType(typeof(T), value);         }         public static object ChangeType(Type t, object value)         {             TypeConverter tc = TypeDescriptor.GetConverter(t);             return tc.ConvertFrom(value);         }         public static void RegisterTypeConverter<T, TC>() where TC : TypeConverter         {             TypeDescriptor.AddAttributes(typeof(T), new TypeConverterAttribute(typeof(TC)));         }     } ----------------
Post a Comment
Read more

How to create a countdown timer in jquery

Create a countdown timer in jQuery First we need to include the jQuery library file to the HTML page to perform this task. To do that we need to understand that what exactly a jQuery library fie is ? JQuery library file is the library of JavaScript, which means this file contains the predefined functions of jQuery. We just need to call these functions to perform the task. jQuery functions reduces the lines of code and makes our task easy. As this jQuery library file contains the javascript functions so we need to call the function within <script> </script> tag. Now after including the file, we need to define a variable which will store that for how long you want the timer on the page(c=60) and now the time you set needs to be changed in hours , minutes and seconds using the code “ var hours = parseInt( time / 3600 ) % ;var minutes = parseInt( time / 60 ) % 60; var seconds = time % 60;” Now we need to put the condition if timer got finished (if (t
1 comment
Read more

Tip/Trick: Fix Common SEO Problems Using the URL Rewrite Extension

Search engine optimization (SEO) is important for any publically facing web-site.  A large % of traffic to sites now comes directly from search engines, and improving your site’s search relevancy will lead to more users visiting your site from search engine queries.  This can directly or indirectly increase the money you make through your site. This blog post covers how you can use the free Microsoft  URL Rewrite Extension  to fix a bunch of common SEO problems that your site might have.  It takes less than 15 minutes (and no code changes) to apply 4 simple  URL Rewrite  rules to your site, and in doing so cause search engines to drive more visitors and traffic to your site.  The techniques below work equally well with both ASP.NET Web Forms and ASP.NET MVC based sites.  They also works with all versions of ASP.NET (and even work with non-ASP.NET content). [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at:  twitter.com/scottg
Post a Comment
Read more