How can I decrypt a string using AES algorithm in c#?

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+2 Q:

How can I decrypt a string using AES algorithm in c#?

Hi,

I have an encrypted string from one of our customers.
This string was encrypted using the AES method in Java.

The only thing I have is the key: "xxxxxxxxxxxxxxxxxxxxxxxx" (24 chars) and the encrypted text: "56e84e9f6344826bcfa439cda09e5e96" (32 chars). (This really is the only data I have)

I can't seem to find a method to decrypt this string.

Could anyone provide me with a working example.

Cheers, S.

+2 A:

Here are two complete code samples for you:

You might also find c# implementations of AES encryption here on SO interesting.

I found another example Simple encrypting and decrypting data in C# where they use only the Pass Phrase to decrypt.

Filip Ekberg 2010-07-12 08:18:45

In these example you require: public static string Decrypt(string cipherText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize)I only have the first 2

Sem Dendoncker 2010-07-12 08:21:13

@Sem, afaik you will need all those to be able to decrypt it. Since those were used when you encrypted it.

Filip Ekberg 2010-07-12 08:23:07

@Sam, check this out: http://www.codeproject.com/KB/security/DotNetCrypto.aspx

Filip Ekberg 2010-07-12 08:25:05

These solutions don't work, I'm getting an error: "Invalid length of data" The problem lies here: byte[] cipherBytes = Convert.FromBase64String(cipherText); if i change it by using assci encoding to bytearray i'm not getting the error but then i'm getting a text that isn't readable for sure

Sem Dendoncker 2010-07-12 08:38:18

@Sem, do you have any example data to play with where you know the Input and Output? Would be easier to try it out then.

Filip Ekberg 2010-07-12 08:41:31

Have you seen this Q/A too? http://stackoverflow.com/questions/2994235/c-libraries-to-encrypt-decrypt-using-aes

Filip Ekberg 2010-07-12 08:43:10

@Filip yes I have.Well I only have the key but I don't know what the output has to be. the only thing I know is that the string will be a number eventually.

Sem Dendoncker 2010-07-12 08:48:19

the answer was a combination of a couple of factors, this answer helped me out.

Sem Dendoncker 2010-07-15 16:02:10

A:

Hello Sem !!

Please go through this article "Simple Cryptographer - Simple DES/AES Implementation in C#"

link: http://www.codeproject.com/KB/recipes/Simple_Cryptographer.aspx

Hope this article will help you.

Lokesh 2010-07-12 09:27:06

thx but my key isn't a 32-bit hex but a 24 bit ascii

Sem Dendoncker 2010-07-12 11:21:37

ansaurus

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How can I decrypt a string using AES algorithm in c#?

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