int RAND_load_file(const char *filename, long max_bytes);
int RAND_write_file(const char *filename);
DESCRIPTION
RAND_file_name() generates a default path for the random seed file.
buf points to a buffer of size
num 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 num is too small for the path name, an error
occurs.
RAND_load_file() reads a number of bytes from file filename and adds them to the PRNG. If
max_bytes is non-negative, up to to
max_bytes are read; starting with
OpenSSL 0.9.5, if max_bytes is -1,
the complete file is read.
RAND_write_file() writes a number of random bytes (currently 1024) to
file filename which can be used to
initialize the PRNG by calling RAND_load_file() in a later session.
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 buf on success, and NULL on error.
