diff options
Diffstat (limited to 'lib/libc/stdlib/random.3')
| -rw-r--r-- | lib/libc/stdlib/random.3 | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/lib/libc/stdlib/random.3 b/lib/libc/stdlib/random.3 index c6502bf..4817440 100644 --- a/lib/libc/stdlib/random.3 +++ b/lib/libc/stdlib/random.3 @@ -28,7 +28,7 @@ .\" @(#)random.3 8.1 (Berkeley) 6/4/93 .\" $FreeBSD$ .\" -.Dd June 4, 1993 +.Dd September 4, 2012 .Dt RANDOM 3 .Os .Sh NAME @@ -53,6 +53,14 @@ .Ft char * .Fn setstate "char *state" .Sh DESCRIPTION +.Bf -symbolic +The functions described in this manual page are not cryptographically +secure. +Cryptographic applications should use +.Xr arc4random 3 +instead. +.Ef +.Pp The .Fn random function @@ -98,10 +106,8 @@ as the seed. .Pp The .Fn srandomdev -routine initializes a state array using the -.Xr random 4 -random number device which returns good random numbers, -suitable for cryptographic use. +routine initializes a state array using data from +.Xr random 4 . Note that this particular seeding procedure can generate states which are impossible to reproduce by calling @@ -175,7 +181,6 @@ messages are printed on the standard error output. .Xr arc4random 3 , .Xr lrand48 3 , .Xr rand 3 , -.Xr srand 3 , .Xr random 4 .Sh HISTORY These @@ -191,6 +196,3 @@ The historical implementation used to have a very weak seeding; the random sequence did not vary much with the seed. The current implementation employs a better pseudo-random number generator for the initial state calculation. -.Pp -Applications requiring cryptographic quality randomness should use -.Xr arc4random 3 . |
