úÎ)€(µ     Good experimental#Vincent Hanquez <vincent@snarc.org>None CThis is a simple generator that pull bytes from the system entropy A directly. Its randomness and security properties are absolutely 3 depends on the underlaying system implementation. 2A class of Cryptographic Secure Random generator. 9The main difference with the generic haskell RNG is that % it return bytes instead of integer. ?It is quite similar to the CryptoRandomGen class in crypto-api 9 except that error are not returned to the user. Instead A the user is suppose to handle reseeding by using the NeedReseed ? and SupplyEntropy methods. For other type of errors, the user D is expected to generate bytes with the parameters bounds explicity  defined here. CThe CPRG need to be able to generate up to 2^20 bytes in one call, >Provide a way to query the CPRG to calculate when new entropy - is required to be supplied so the CPRG doesn't repeat output, and < break assumptions. This returns the number of bytes before / which supply entropy should have been called. :Supply entropy to the CPRG, that can be used now or later ; to reseed the CPRG. This should be used in conjunction to , NeedReseed to know when to supply entropy. 8Generate bytes using the CPRG and the number specified. For user of the API, it'$s recommended to use genRandomBytes ; instead of this method directly. the CPRG need to be able , to supply at minimum 2^20 bytes at a time. 0This is the reseed policy requested by the CPRG 'the RG need to be reseed in the number 7 of bytes joined to the type. it should be done before 3 the number reached 0, otherwise an user of the RG = might request too many bytes and get repeated random bytes. %there is no need to reseed as either  the RG doesn't supports it, it's done automatically : or pratically the reseeding period exceed a Word64 type. ,Generate bytes using the cprg in parameter. 1If the number of bytes requested is really high,  it's preferable to use  for better memory efficiency. ,Generate bytes using the cprg in parameter. JThis is not tail recursive and an excessive len (>= 2^29) parameter would  result in stack overflow. *this is equivalent to using Control.Arrow first with . namely it generate ,len bytes and map the bytes to the function f 0Return system entropy using the entropy package  getEntropy JGet a random number generator based on the standard system entropy source  number of bytes to return  CPRG to use number of bytes to return  CPRG to use           crypto-random-api-0.2.0Crypto.Random.API SystemRandomCPRGcprgNeedReseedcprgSupplyEntropy cprgGenBytes ReseedPolicy ReseedInBytes NeverReseedgenRandomBytesgenRandomBytes'withRandomBytesgetSystemEntropygetSystemRandomGen$fCPRGSystemRandom