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RAND_write_file.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBRAND_file_name()\fR generates a default path for the random seed file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the filename. The seed file is \f(CW$RANDFILE\fR if that environment variable is set, \f(CW$HOME\fR/.rnd otherwise. If \f(CW$HOME\fR is not set either, or \fBnum\fR is too small for the path name, an error occurs. .PP \&\fBRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and adds them to the \s-1PRNG.\s0 If \fBmax_bytes\fR is non-negative, up to to \fBmax_bytes\fR are read; starting with OpenSSL 0.9.5, if \fBmax_bytes\fR is \-1, the complete file is read. .PP \&\fBRAND_write_file()\fR writes a number of random bytes (currently 1024) to file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling \&\fBRAND_load_file()\fR in a later session. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRAND_load_file()\fR returns the number of bytes read. .PP \&\fBRAND_write_file()\fR returns the number of bytes written, and \-1 if the bytes written were generated without appropriate seed. .PP \&\fBRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBrand\fR\|(3), \fBRAND_add\fR\|(3), \fBRAND_cleanup\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBRAND_load_file()\fR, \fBRAND_write_file()\fR and \fBRAND_file_name()\fR are available in all versions of SSLeay and OpenSSL.
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