rand_bytes_ex() and rand_priv_bytes_ex() are the equivalent of RAND_bytes() and
RAND_priv_bytes() in the public API except that they both take an additional
-B<ctx> parameter.
+I<ctx> parameter.
The DRBG used for the operation is the public or private DRBG associated with
-the specified B<ctx>. The parameter can be NULL, in which case
+the specified I<ctx>. The parameter can be NULL, in which case
the default library ctx is used.
If the default RAND_METHOD has been changed then for compatibility reasons the
RAND_METHOD will be used in preference and the DRBG of the library context