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| author | des <des@FreeBSD.org> | 2012-09-04 21:40:53 +0000 |
|---|---|---|
| committer | des <des@FreeBSD.org> | 2012-09-04 21:40:53 +0000 |
| commit | 2d0a5cb1e0e9d676c2b3e5999c28379692844fe9 (patch) | |
| tree | 5c7773f188d47ed604cda96e02f329d653214533 /lib/libc/stdlib/rand.3 | |
| parent | dec17a5bb53dc001725a88fd95fc97330c8dea34 (diff) | |
| download | FreeBSD-src-2d0a5cb1e0e9d676c2b3e5999c28379692844fe9.zip FreeBSD-src-2d0a5cb1e0e9d676c2b3e5999c28379692844fe9.tar.gz | |
Add a prominent warning about these functions' unsuitability for
cryptographic purposes, and recommend using arc4random(3) instead.
Diffstat (limited to 'lib/libc/stdlib/rand.3')
| -rw-r--r-- | lib/libc/stdlib/rand.3 | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/libc/stdlib/rand.3 b/lib/libc/stdlib/rand.3 index 3eb1a1d..6805073 100644 --- a/lib/libc/stdlib/rand.3 +++ b/lib/libc/stdlib/rand.3 @@ -55,9 +55,15 @@ .Fn rand_r "unsigned *ctx" .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 These interfaces are obsoleted by .Xr random 3 . -.Ef .Pp The .Fn rand @@ -88,9 +94,6 @@ The function initializes a seed using the .Xr random 4 random number device which returns good random numbers. -However, the -.Fn rand -function still remains unsuitable for cryptographic use. .Pp The .Fn rand_r @@ -105,8 +108,6 @@ For better generator quality, use .Xr random 3 or .Xr lrand48 3 . -Applications requiring cryptographic quality randomness should use -.Xr arc4random 3 . .Sh SEE ALSO .Xr arc4random 3 , .Xr lrand48 3 , |
