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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_add, RAND_seed, RAND_status, RAND_event, RAND_screen \- add entropy to the PRNG .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& void RAND_seed(const void *buf, int num); \& \& void RAND_add(const void *buf, int num, double entropy); \& \& int RAND_status(void); \& \& #if OPENSSL_API_COMPAT < 0x10100000L \& int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam); \& void RAND_screen(void); \& #endif .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fIRAND_add()\fR mixes the \fBnum\fR bytes at \fBbuf\fR into the \s-1PRNG\s0 state. Thus, if the data at \fBbuf\fR are unpredictable to an adversary, this increases the uncertainty about the state and makes the \s-1PRNG\s0 output less predictable. Suitable input comes from user interaction (random key presses, mouse movements) and certain hardware events. The \&\fBentropy\fR argument is (the lower bound of) an estimate of how much randomness is contained in \fBbuf\fR, measured in bytes. Details about sources of randomness and how to estimate their entropy can be found in the literature, e.g. \s-1RFC 1750.\s0 .PP \&\fIRAND_add()\fR may be called with sensitive data such as user entered passwords. The seed values cannot be recovered from the \s-1PRNG\s0 output. .PP OpenSSL makes sure that the \s-1PRNG\s0 state is unique for each thread. On systems that provide \f(CW\*(C`/dev/urandom\*(C'\fR, the randomness device is used to seed the \s-1PRNG\s0 transparently. However, on all other systems, the application is responsible for seeding the \s-1PRNG\s0 by calling \fIRAND_add()\fR, \&\fIRAND_egd\fR\|(3) or \fIRAND_load_file\fR\|(3). .PP \&\fIRAND_seed()\fR is equivalent to \fIRAND_add()\fR when \fBnum == entropy\fR. .PP \&\fIRAND_event()\fR and \fIRAND_screen()\fR are deprecated and should not be called. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIRAND_status()\fR returns 1 if the \s-1PRNG\s0 has been seeded with enough data, 0 otherwise. .PP \&\fIRAND_event()\fR calls \fIRAND_poll()\fR and returns \fIRAND_status()\fR. .PP RAND_screen calls \fIRAND_poll()\fR. .PP The other functions do not return values. .SH "HISTORY" .IX Header "HISTORY" \&\fIRAND_event()\fR and \fIRAND_screen()\fR are deprecated since OpenSSL 1.1.0. Use the functions described above instead. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIrand\fR\|(3), \fIRAND_egd\fR\|(3), \&\fIRAND_load_file\fR\|(3), \fIRAND_cleanup\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at .