RAND_event()

[openssl.git] / doc / crypto / RAND_add.pod

diff --git a/doc/crypto/RAND_add.pod b/doc/crypto/RAND_add.pod
index 16a86989330c81a316bbdc2917aafb2b58399c3a..67c66f3e0c96a9e92ee2731581a3d2bd5499c965 100644 (file)
--- a/doc/crypto/RAND_add.pod
+++ b/doc/crypto/RAND_add.pod
@@ -2,7 +2,8 @@
 
 =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
 
@@ -14,6 +15,7 @@ RAND_add, RAND_seed, RAND_status, RAND_screen - add entropy to the PRNG
 
  int  RAND_status(void);
 
+ int  RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam);
  void RAND_screen(void);
 
 =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_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
 programmers. It adds the current contents of the screen to the PRNG.
-For applications that can catch Windows events, seeding the PRNG with
-the parameters of B<WM_MOUSEMOVE> events is a significantly better
-source of randomness. It should be noted that both methods cannot be
-used on servers that run without user interaction.
+For applications that can catch Windows events, seeding the PRNG by
+calling RAND_event() is a significantly better source of
+randomness. It should be noted that both methods cannot be used on
+servers that run without user interaction.
 
 =head1 RETURN VALUES
 
-RAND_status() returns 1 if the PRNG has been seeded with enough data,
-0 otherwise.
+RAND_status() and RAND_event() return 1 if the PRNG has been seeded
+with enough data, 0 otherwise.
 
 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
 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