| License | BSD-style |
|---|---|
| Maintainer | Vincent Hanquez <vincent@snarc.org> |
| Stability | experimental |
| Portability | Good |
| Safe Haskell | None |
| Language | Haskell2010 |
Crypto.Random.Entropy
Description
Synopsis
- getEntropy :: ByteArray byteArray => Int -> IO byteArray
- data EntropyError
Documentation
getEntropy :: ByteArray byteArray => Int -> IO byteArray Source #
Get some entropy from the system source of entropy
data EntropyError Source #
The system would not give the entropy it was asked for.
This is the one failure in the library with nothing to fall back on and
nothing sensible to return: a key drawn from bytes that are not random
is worse than no key. It used to be reported with error and fail,
which left a caller no way to tell it from a bug in the library, and no
way to say anything useful about it.
Constructors
| NoEntropySource | The system offers no source of entropy at all. On Unix that
means no |
| EntropyShort Int Int | The sources between them gave fewer bytes than were asked for, three times over. The two numbers are how many were wanted and how many arrived. |
| EntropySourceLost String | A source that could be opened once could not be opened again. The string names it. |
Instances
| Exception EntropyError Source # | |
Defined in Crypto.Random.Entropy.Source Methods toException :: EntropyError -> SomeException # fromException :: SomeException -> Maybe EntropyError # displayException :: EntropyError -> String # | |
| Show EntropyError Source # | |
Defined in Crypto.Random.Entropy.Source Methods showsPrec :: Int -> EntropyError -> ShowS # show :: EntropyError -> String # showList :: [EntropyError] -> ShowS # | |
| Eq EntropyError Source # | |
Defined in Crypto.Random.Entropy.Source | |