RAND_load_file
Section: OpenSSL (3)
Updated: 2017-05-25
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NAME
RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
SYNOPSIS
#include <openssl/rand.h>
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);
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.
SEE ALSO
rand(3),
RAND_add(3),
RAND_cleanup(3)
HISTORY
RAND_load_file(),
RAND_write_file() and
RAND_file_name() are available in
all versions of SSLeay and OpenSSL.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- SEE ALSO
-
- HISTORY
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