We are implementing an Engine in openssl 0.9.8a with 3DES support.
Initial tests gave good results, but testing in CBC mode failed.

The question is how to handle the (EVP_CIPHER_CTX *) ctx-> iv parameter.
is it only for storage of the iv or can it be updated (from the calling
EVP structure) between engine_cipher() calls. And must the engine update
it in each engine_cipher() call?

Or is it enough to update ctx-iv in the engine_cleanup call, to set the
resulting iv

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