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=pod
=head1 NAME
RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
=head1 SYNOPSIS
#include
const char *RAND_file_name(char *buf, size_t num);
int RAND_load_file(const char *filename, long max_bytes);
int RAND_write_file(const char *filename);
=head1 DESCRIPTION
RAND_file_name() generates a default path for the random seed
file. B points to a buffer of size B in which to store the
filename. The seed file is $RANDFILE if that environment variable is
set, $HOME/.rnd otherwise. If $HOME is not set either, or B is
too small for the path name, an error occurs.
RAND_load_file() reads a number of bytes from file B and
adds them to the PRNG. If B is non-negative,
up to to B are read; starting with OpenSSL 0.9.5,
if B is -1, the complete file is read.
RAND_write_file() writes a number of random bytes (currently 1024) to
file B which can be used to initialize the PRNG by calling
RAND_load_file() in a later session.
=head1 RETURN VALUES
RAND_load_file() returns the number of bytes read.
RAND_write_file() returns the number of bytes written, and -1 if the
bytes written were generated without appropriate seed.
RAND_file_name() returns a pointer to B on success, and NULL on
error.
=head1 SEE ALSO
L, L, L
=head1 HISTORY
RAND_load_file(), RAND_write_file() and RAND_file_name() are available in
all versions of SSLeay and OpenSSL.
=cut