This function initializes the OATH library. Every user of this
library needs to call this function before using other functions.
You should call oath_done() when use of the OATH library is no
Note that this function may also initialize Libgcrypt, if the OATH
library is built with libgcrypt support and libgcrypt has not been
initialized before. Thus if you want to manually initialize
libgcrypt you must do it before calling this function. This is
useful in cases you want to disable libgcrypts internal lockings