Section: OpenSSL (3SSL)
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RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
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);
generates a default path for the random seed
points to a buffer of size num
in which to store the
filename. The seed file is $RANDFILE
if that environment variable is
/.rnd otherwise. If $HOME
is not set either, or num
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.
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
are available in
all versions of SSLeay and OpenSSL.
- RETURN VALUES
- SEE ALSO