System.Entropy

Obtain entropy from system sources or x86 RDRAND when available.

Currently supporting:

• Windows via CryptoAPI - *nix systems via /dev/urandom - Includes QNX - Xen (only when RDRAND is available)

Documentation

getEntropy :: Int -> IO ByteString

Get a specific number of bytes of cryptographically secure random data using the system-specific facilities.

Use RDRAND if available and XOR with '/dev/urandom' on *nix and CryptAPI when on Windows. In short, this entropy is considered cryptographically secure but not true entropy.

data CryptHandle

Handle for manual resource mangement

openHandle :: IO CryptHandle

Open a CryptHandle

hGetEntropy :: CryptHandle -> Int -> IO ByteString

Read random data from a CryptHandle

closeHandle :: CryptHandle -> IO ()

Close the CryptHandle