Encryption mismatch b/w iOS and C#

[Rahim K.]

Hi

I am testing the RNCryptor lib for a project. Basically we will be encrypting the data on iOS client and then decrypting on the .NET server. For my test to ensure its working, I am trying to encrypt a string in iOS and C# but get different results. The code snippet is below for both:

C#

string s = "this is a test";

RNCryptor.Encryptor en = new Encryptor();

en.TextEncoding = System.Text.Encoding.UTF8; // I tried all kinds of encoding but no luck

 string enc = en.Encrypt(s, "0x100001");

Result: AgEIqMSdKGo8US1nTSVoHOcqf94mzuYbB7NOyB1Mppa0fELEw868kX6YVpIywZVdxTAUafVu7FfTlrzUDVXc4XSn3QWc3vSxAXSxDQtNAZuW2g==

iOS

NSData *data = [@"this is a test" dataUsingEncoding:NSUTF8StringEncoding];

NSError *error;

NSData *encryptedData = [RNEncryptor encryptData:data

                                     withSettings:kRNCryptorAES256Settings

                                     password:@"0x100001"

      error:&error];

Result:

AwETKDI+AhqRFxUn0zKnoQL9oDx+Nf4/NwtTcnZcN/OpopBgwQ8Qy5nXwM9VDdOMRlmqJUCgYMs6hGzga0K7/yMGXlipfk1nYPhn4hJs2uKyzA==

Can you guys please let me know where the problem is? I expect it to produce the same encrypted string but its not. I would appreciate a quick response as we need to decide on the library.

Thanks

Rahim

[Rob Napier]

By design, every encryption will return a different result. This is a security feature, implemented by the injection of several random numbers in the protocol.

-Rob

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[Rahim Khatri]

Thank you for the response. That's what I was thinking as I was able to decrypt the string correctly on the other side.

Rahim