| Portability | unknown |
|---|---|
| Stability | stable |
| Maintainer | Vincent Hanquez <vincent@snarc.org> |
| Safe Haskell | None |
Crypto.Random.AESCtr
Description
this CPRNG is an AES based counter system.
the internal size of fields are: 16 bytes IV, 16 bytes counter, 32 bytes key
each block are generated the following way:
aes (IV xor counter) -> 16 bytes output
- data AESRNG
- make :: ByteString -> Either GenError AESRNG
- makeSystem :: IO AESRNG
- genRandomBytes :: AESRNG -> Int -> (ByteString, AESRNG)
Documentation
data AESRNG
An opaque object containing an AES CPRNG
make :: ByteString -> Either GenError AESRNG
make an AES RNG from a bytestring seed. the bytestring need to be at least 64 bytes. if the bytestring is longer, the extra bytes will be ignored and will not take part in the initialization.
use makeSystem to not have to deal with the generator seed.
makeSystem :: IO AESRNG
Initialize a new AES RNG using the system entropy.
genRandomBytes :: AESRNG -> Int -> (ByteString, AESRNG)
get a Random number of bytes from the RNG. it generate randomness by block of 16 bytes, but will truncate to the number of bytes required, and lose the truncated bytes.