\d dZddlZddlZddlZeeddZejZGdde Z Gdde Z Gdd Z e Z e jZe jZ[ gd ZdS) zQ Cryptographically secure random implementation, with fallback on normal random. N getrandbitsceZdZdZdS)SecureRandomNotAvailablezD Exception raised when no secure random algorithm is found. N__name__ __module__ __qualname____doc__8lib/python3.11/site-packages/twisted/python/randbytes.pyrrr rceZdZdZdS)SourceNotAvailablezQ Internal exception used when a specific random source is not available. Nrr r r rrrr rc`eZdZdZdZeZdZd dZdZe j Z e ddZ dZ d Zd S) RandomFactoryz Factory providing L{secureRandom} and L{insecureRandom} methods. You shouldn't have to instantiate this class, use the module level functions instead: it is an implementation detail and could be removed or changed arbitrarily. r c| tj|S#ttf$r}t |d}~wwxYw)zO Wrapper around C{os.urandom} that cleanly manage its absence. N)osurandomAttributeErrorNotImplementedErrorr)selfnbyteses r _osUrandomzRandomFactory._osUrandom-sJ (:f%% % 34 ( ( ($Q'' ' (s;6;Fc ||S#t$rYnwxYw|r1tjdtd||St d)ak Return a number of secure random bytes. @param nbytes: number of bytes to generate. @type nbytes: C{int} @param fallback: Whether the function should fallback on non-secure random or not. Default to C{False}. @type fallback: C{bool} @return: a string of random bytes. @rtype: C{str} zPurandom unavailable - proceeding with non-cryptographically secure random source)category stacklevelz!No secure random source available)rrwarningswarnRuntimeWarninginsecureRandomr)rrfallbacks r secureRandomzRandomFactory.secureRandom6s ??6** *!    D   P MM'      &&v.. .*+NOO Os  $$c|j2||dz}d|dzz|z}t|Std)z3 Wrapper around C{os.getrandbits}. Nz%%0%dxrz#random.getrandbits is not available)r_fromhexr)rrnhexBytess r _randBitszRandomFactory._randBitsSsT   '  !,,A FQJ/14HH%% % !FGGGr r c`dfdt|DS)z6 Wrapper around the C{random} module. r c^g|])}ttjjg*Sr )bytesrandomchoice_BYTES).0irs r z-RandomFactory._randModule..ds0TTT dk : :;<<TTTr )joinrange)rrs` r _randModulezRandomFactory._randModule`s2xxTTTTeFmmTTTUUUr cfdD]-} t|||cS#t$rY*wxYwdS)z Return a number of non secure random bytes. @param nbytes: number of bytes to generate. @type nbytes: C{int} @return: a string of random bytes. @rtype: C{str} )r+r7N)getattrr)rrsrcs r r#zRandomFactory.insecureRandomfsb0  C )wtS))&11111%      s ! ..N)F)rrr r randomSourcesrrr%r+r. maketrans _maketransr1r7r#r r r rrsMK(((PPPP:HHHJ ZS ! !FVVV r r)r%r#r)r rr/r r9rr.fromhexr( RuntimeErrorrrrfactoryr%r#__all__r r r rBs   gfmT22 =|  UUUUUUUUp -//# '  I H Hr