blob: 90b42f02ab123f3341894fd1c062063e3f051d56 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
{- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module ByteStrings where
import qualified Data.ByteString as B
import qualified Raaz
allByteStringsOfLength :: Int -> [B.ByteString]
allByteStringsOfLength = go []
where
go ws n
| n == 0 = return (B.pack ws)
| otherwise = do
w <- [0..255]
go (w:ws) (n-1)
-- | Contains every possible byte strings, with shorter ones first.
allByteStrings :: [B.ByteString]
allByteStrings = concatMap allByteStringsOfLength [1..]
chunkByteString :: Int -> B.ByteString -> [B.ByteString]
chunkByteString n = go []
where
go cs b
| B.length b <= n = reverse (b:cs)
| otherwise =
let (h, t) = B.splitAt n b
in go (h:cs) t
randomByteStringOfLength :: Int -> IO B.ByteString
randomByteStringOfLength n = Raaz.securely gen
where
gen :: Raaz.RandM B.ByteString
gen = Raaz.randomByteString (Raaz.BYTES n)
|