I had a similar problem with Twofish about a decade ago. The biggest problem was that there was a definite difference in implementation, basically like starting with different IVs or maybe endian problems on different platforms. My solution was to get the C++ code and code up an exact workalike XS (Crypt::Twofish). You may need to do the same; look at RijndaelManaged's source (C#?) and get the constants it uses, then see if you can make your own private version of Crypt::Rijndael which handles it. A pure perl version would be fine too, although slow, if you're willing to take the time to decrypt legacy encrypted data, but that wouldn't work for production environment code.

HTH,
SSF

In reply to Re: decrypting .net RijndaelManaged with perl by sflitman
in thread decrypting .net RijndaelManaged with perl by rpadmin

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