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RAND_event()

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This commit is contained in:
Ulf Möller 2000-03-22 15:30:03 +00:00
parent e77066ea0a
commit 513393f8d4
1 changed files with 17 additions and 8 deletions
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25
doc/crypto/RAND_add.pod
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@ -2,7 +2,8 @@
=head1 NAME =head1 NAME
RAND_add, RAND_seed, RAND_status, RAND_screen - add entropy to the PRNG RAND_add, RAND_seed, RAND_status, RAND_event, RAND_screen - add
entropy to the PRNG
=head1 SYNOPSIS =head1 SYNOPSIS
@ -14,6 +15,7 @@ RAND_add, RAND_seed, RAND_status, RAND_screen - add entropy to the PRNG
int RAND_status(void); int RAND_status(void);
int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam);
void RAND_screen(void); void RAND_screen(void);
=head1 DESCRIPTION =head1 DESCRIPTION
@ -40,17 +42,24 @@ or L<RAND_load_file(3)|RAND_load_file(3)>.
RAND_seed() is equivalent to RAND_add() when B<num == entropy>. RAND_seed() is equivalent to RAND_add() when B<num == entropy>.
RAND_event() collects the entropy from Windows events such as mouse
movements and other user interaction. It should be called with the
B<iMsg>, B<wParam> and B<lParam> arguments of I<all> messages sent to
the window procedure. It will estimate the entropy contained in the
event message (if any), and add it to the PRNG. The program can then
process the messages as usual.
The RAND_screen() function is available for the convenience of Windows The RAND_screen() function is available for the convenience of Windows
programmers. It adds the current contents of the screen to the PRNG. programmers. It adds the current contents of the screen to the PRNG.
For applications that can catch Windows events, seeding the PRNG with For applications that can catch Windows events, seeding the PRNG by
the parameters of B<WM_MOUSEMOVE> events is a significantly better calling RAND_event() is a significantly better source of
source of randomness. It should be noted that both methods cannot be randomness. It should be noted that both methods cannot be used on
used on servers that run without user interaction. servers that run without user interaction.
=head1 RETURN VALUES =head1 RETURN VALUES
RAND_status() returns 1 if the PRNG has been seeded with enough data, RAND_status() and RAND_event() return 1 if the PRNG has been seeded
0 otherwise. with enough data, 0 otherwise.
The other functions do not return values. The other functions do not return values.
@ -63,6 +72,6 @@ L<RAND_load_file(3)|RAND_load_file(3)>, L<RAND_cleanup(3)|RAND_cleanup(3)>
RAND_seed() and RAND_screen() are available in all versions of SSLeay RAND_seed() and RAND_screen() are available in all versions of SSLeay
and OpenSSL. RAND_add() and RAND_status() have been added in OpenSSL and OpenSSL. RAND_add() and RAND_status() have been added in OpenSSL
0.9.5. 0.9.5, RAND_event() in OpenSSL 0.9.5a.
=cut =cut