Hello.

I tried using OpenSSL library for encrypting a string in DES using OpenSSL. However, I found out that it was very difficult to understand what to do by reading MAN page for the DES portion of the OpenSSL.

One thing I can't figure out is :

DES_set_key() works like DES_set_key_checked() if the DES_check_key flag is non-zero, otherwise like DES_set_key_unchecked().

How is the DES_check_key flag set? There seems to be no function or data structure where the DES_check_key flag is supposed to be specified.

Thank you.
JongAm Park
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