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Re: C# RijndaelEnhanced decrypt with php mcrypt [message #174066 is a reply to message #174048]

Fri, 20 May 2011 22:39

Michael Vilain
Messages: 88
Registered: September 2010

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In article <4dd63095$0$6547$9b4e6d93(at)newsspool4(dot)arcor-online(dot)net>,
Heiko GreenRover Henning <greenrover(at)arcor(dot)de> wrote:

> hi
>
> i have a C# .net app with i decompiled. This app uses for login password
> cryption:
> http://www.obviex.com/samples/Sample.aspx?Source=EncryptionWithSaltCS&T itle=En
> cryption%20With%20Salt&Lang=C%23
>
> C# Code
> rijndaelKey = new Krypto.RijndaelEnhanced(passPhrase, initVector);
> PlainPassword =
> DiverseVariablen.rijndaelKey.Decrypt(Conversions.ToString(row["ProjectKennwort
> "])))
>
>
> I have pass and iv.
>
> How can i decrypt the passwords in php? I tryted allready several
> variants of mcrypt_decrypt().
>
> Didt somene have a idea?
>
> Wha i dont understand is that the iv has 16 chars but it should be an
> 256b encryption with normaly depends a 32chars iv.
>
> I also allready tryed a http://phpseclib.sourceforge.net/ for decryption
> without any success.
> http://pastebin.com/SKPG7gR2
>
> Friendly regards and big thanks.

http://www.obviex.com/samples/EncryptionWithSalt.aspx

shows that the encryption code in C# is a "built-in" using the
Rijndael/AES symetrical encryption algorithm.

php has the crypt() function which is really a 1-way hashing algorithm.
You can encrypt text but cannot decrypt it. Checking for a valid match
involves taking the supplied password, text, and salt, running it
through the crypt() function and comparing the encrypted results. If
they match, then you have the right password. AFAIK, there's no
built-in implementation of the same sort of encryption as in the C#
implemntation.

My guess is you are going to have to modify the C# code to do a
php-compatible encryption. You probably won't find a php implementation
of the C# code unless you write it yourself.

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[Message index]

		C# RijndaelEnhanced decrypt with php mcrypt By: Heiko GreenRover Henn on Fri, 20 May 2011 09:12
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Michael Vilain on Fri, 20 May 2011 22:39
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Thomas 'PointedEars' on Sat, 21 May 2011 21:06
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Heiko GreenRover Henn on Tue, 24 May 2011 10:58
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Thomas 'PointedEars' on Tue, 24 May 2011 21:29
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Trevor on Mon, 23 May 2011 17:17
		Re: C# RijndaelEnhanced decrypt with php mcrypt By: Michael Vilain on Mon, 23 May 2011 17:35

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