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WindowsRNGiÿÿÿÿN(tBaseRNGcBs2eZdZd„Zd„Zd„Zd„ZRS(s<CryptGenRandom>cCs tjƒ|_tj|ƒdS(N(t	winrandomtnewt_WindowsRNG__winrandRt__init__(tself((s:/usr/lib/python2.7/dist-packages/Crypto/Random/OSRNG/nt.pyR#scCsS|jrtdƒ‚n|jjdƒ}t|ƒdksBt‚tj|ƒdS(s*Work around weakness in Windows RNG.

        The CryptGenRandom mechanism in some versions of Windows allows an
        attacker to learn 128 KiB of past and future output.  As a workaround,
        this function reads 128 KiB of 'random' data from Windows and discards
        it.

        For more information about the weaknesses in CryptGenRandom, see
        _Cryptanalysis of the Random Number Generator of the Windows Operating
        System_, by Leo Dorrendorf and Zvi Gutterman and Benny Pinkas
        http://eprint.iacr.org/2007/419
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