perhaps you had not understand my question, my question was related to modes and iv.
I understand your question perfectly well. The problem is that you are referring to someone else's code and we do not have access to it, so how can we tell you which function to use? Those function definitions on their own provide no useful information. All I can tell you is that iv is a pointer to a character string, but how that fits in with these functions is anyone's guess.
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