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Closes #15213: update comment for _PyOS_URandom

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Georg Brandl 2013-10-06 18:43:19 +02:00
parent 7d07833655
commit c6a2c9b466
2 changed files with 6 additions and 4 deletions
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5
Doc/library/os.rst
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@ -3306,8 +3306,9 @@ Miscellaneous Functions
This function returns random bytes from an OS-specific randomness source. The
returned data should be unpredictable enough for cryptographic applications,
though its exact quality depends on the OS implementation. On a Unix-like
system this will query /dev/urandom, and on Windows it will use CryptGenRandom.
If a randomness source is not found, :exc:`NotImplementedError` will be raised.
system this will query ``/dev/urandom``, and on Windows it will use
``CryptGenRandom()``. If a randomness source is not found,
:exc:`NotImplementedError` will be raised.
For an easy-to-use interface to the random number generator
provided by your platform, please see :class:`random.SystemRandom`.

5
Python/random.c
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@ -224,8 +224,9 @@ lcg_urandom(unsigned int x0, unsigned char *buffer, size_t size)
}
}
/* Fill buffer with size pseudo-random bytes, not suitable for cryptographic
use, from the operating random number generator (RNG).
/* Fill buffer with size pseudo-random bytes from the operating system random
number generator (RNG). It is suitable for for most cryptographic purposes
except long living private keys for asymmetric encryption.
Return 0 on success, raise an exception and return -1 on error. */
int