| =pod |
| |
| =head1 NAME |
| |
| RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file |
| |
| =head1 SYNOPSIS |
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| #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); |
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| =head1 DESCRIPTION |
| |
| RAND_file_name() generates a default path for the random seed |
| file. B<buf> points to a buffer of size B<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 B<num> is |
| too small for the path name, an error occurs. |
| |
| RAND_load_file() reads a number of bytes from file B<filename> and |
| adds them to the PRNG. If B<max_bytes> is non-negative, |
| up to to B<max_bytes> are read; starting with OpenSSL 0.9.5, |
| if B<max_bytes> is -1, the complete file is read. |
| |
| RAND_write_file() writes a number of random bytes (currently 1024) to |
| file B<filename> which can be used to initialize the PRNG by calling |
| RAND_load_file() in a later session. |
| |
| =head1 RETURN VALUES |
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| 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<buf> on success, and NULL on |
| error. |
| |
| =head1 SEE ALSO |
| |
| L<rand(3)|rand(3)>, L<RAND_add(3)|RAND_add(3)>, L<RAND_cleanup(3)|RAND_cleanup(3)> |
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| =head1 HISTORY |
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| RAND_load_file(), RAND_write_file() and RAND_file_name() are available in |
| all versions of SSLeay and OpenSSL. |
| |
| =cut |
