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 file.
points to a buffer of size num
in which to store the
On all systems, if the environment variable RANDFILE
is set, its value
will be used as the seed file name.
Otherwise, the file is called ".rnd", found in platform dependent
- On Windows (in order of preference)
- %HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\
- On VMS
- On all other systems
If $HOME (on non-Windows and non-VMS system) is not set either, or num
too small for the path name, an error occurs.
reads a number of bytes from file filename
adds them to the PRNG. If max_bytes
is non-negative, up to
are read; if max_bytes
is -1, the complete file is
writes a number of random bytes (currently 1024) to
which can be used to initialize the PRNG by calling
in a later session.
returns the number of bytes read or -1 on error.
returns the number of bytes written, and -1 if the
bytes written were generated without appropriate seed.
returns a pointer to buf
on success, and NULL on
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Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy in the
file LICENSE in the source distribution or at