Transferring encrypted data between OA and Windows

[iain]

I have text generated by a C# application that I need to read into an OA script. It's working fine, but I don't want to be transferring plain text.

It looks simple enough to encrypt/decrypt strings in OA using aes256Encrypt/Decrypt, but I don't know if it's possible to replicate those functions in Windows. The AES engine in C# seems to need more parameters than a single text key, and I'm lost. Is there a way to emulate the OA AES encryption in Windows, or any other standard shared encryption method?

Thanks!

[kilianvp]

Yes for C# use a 32 bytes long String UTF-8 Key and as IV empty 16 bytes (new byte[16]), the mode is CipherMode.CBC and Padding is PaddingMode.Zeros

Use the same key for aes256Encrypt/Decrypt. If you use a longer key for WinCC OA, it will be truncated at 32 bytes. You can use Array.Resize to truncated at 32 bytes.

[iain]

Excellent! Thank you.