BF_cbc_encrypt()

[Paul Khavkine]

I'm fooling around trying to figure out how to use the OpenSSL C API.
I've read the docs and some things are clear some are not.
In the functions BF_cbc_encrypt() what is the ivec variable.
What does it do and what is it for and what is it supposed to do?

Thanx for any help.
Paul

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