Bug 3375 - System.Security.Cryptography.HashAlgorithm.Dispose not present in .NET 4
Summary: System.Security.Cryptography.HashAlgorithm.Dispose not present in .NET 4
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 2.10.x
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-02-10 10:02 UTC by Simon Chisholm
Modified: 2012-03-23 08:25 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Simon Chisholm 2012-02-10 10:02:49 UTC
As title.  For 2.10.5 and 2.10.6 at least, the .NET 4.0 System.Security assembly doesn't contain a Dispose() method in its HashAlgorithm class.

HashAlgorithm.cs does contain the code, guarded by a #if NET_4_0 check but the code hasn't been included in the build output.
Comment 1 Sebastien Pouliot 2012-03-22 20:58:04 UTC
The HashAlgorithm type is in mscorlib.dll (not System.Security.dll) and does not publicly expose Dispose because this, like a lot of 4.0 changes, are only available in Mono 2.11+ (or if you build from source).

note: it's not in the source code for HashAlgorithm.cs in the 'mono-2-10' branch - you're probably looking at the source code for 'master'.

I'll backport 940bdeca94be89d2423165e741165a4832b8e724 (it occurs in several types, not just HashAlgorithm) to mono-2-10 for future releases. In the mean time a workaround is to cast to IDisposable before calling Dispose, e.g. 
   (hash as IDisposable).Dispose();
Comment 2 Sebastien Pouliot 2012-03-23 08:25:37 UTC
backported in mono-2-10 : 6e7c741e825596b8cbaf00787d0c49eccf246a7c