=head1 NAME
-RAND_add, RAND_seed, RAND_screen - Add entropy to the PRNG
+RAND_add, RAND_seed, RAND_screen - add entropy to the PRNG
=head1 SYNOPSIS
void RAND_seed(const void *buf, int num);
- void RAND_add(const void *buf, int num, int entropy);
+ void RAND_add(const void *buf, int num, double entropy);
+
+ int RAND_status(void);
void RAND_screen(void);
less predictable. Suitable input comes from user interaction (random
key presses, mouse movements) and certain hardware events. The
B<entropy> argument is (the lower bound of) an estimate of how much
-randomness is contained in B<buf>. Details about sources of randomness
-and how to estimate their entropy can be found in the literature,
-e.g. RFC 1750.
+randomness is contained in B<buf>, measured in bytes. Details about
+sources of randomness and how to estimate their entropy can be found
+in the literature, e.g. RFC 1750.
RAND_add() may be called with sensitive data such as user entered
passwords. The seed values cannot be recovered from the PRNG output.
=head1 RETURN VALUES
-These functions do not return values.
+RAND_status() returns 1 if the PRNG has been seeded with enough data,
+0 otherwise.
+
+The other functions do not return values.
=head1 SEE ALSO
=head1 HISTORY
RAND_seed() and RAND_screen() are available in all versions of SSLeay
-and OpenSSL. RAND_add() was added in OpenSSL 0.9.5.
+and OpenSSL. RAND_add() and RAND_status() have been added in OpenSSL
+0.9.5.
=cut