I have been running the NIST AES Algorithm Validation Suite (AVS) using the OpenSSL crypto library and all the results for all the modes come out as predicted, except for CFB 1-bit which is not supported by OpenSSL and CFB 8-bit which returns a "wrong" result. CFB 128-bit is fine. The pertinent tests here are the Monte Carlo Tests. I was wondering if anyone else had run these using OpenSSL and got the predicted result for CFB 8-bit. Or is this a problem in the OpenSSL implementation? It's always possible that there is a bug in my test vehicle but this is the only failing case. Perhaps single octet values aren't handled correctly? I am using EVP_CipherInit() and EVP_cipher() for the actual encrypt/decrypt functions. Any help/comments much appreciated. Chris Brook
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