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hashlib.pyc
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Python Compiled Bytecode
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2014-12-31
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# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
'''hashlib module - A common interface to many hash functions.
new(name, string=\'\') - returns a new hash object implementing the
given hash function; initializing the hash
using the given string data.
Named constructor functions are also available, these are much faster
than using new():
md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
More algorithms may be available on your platform but the above are
guaranteed to exist.
NOTE: If you want the adler32 or crc32 hash functions they are available in
the zlib module.
Choose your hash function wisely. Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.
Hash objects have these methods:
- update(arg): Update the hash object with the string arg. Repeated calls
are equivalent to a single call with the concatenation of all
the arguments.
- digest(): Return the digest of the strings passed to the update() method
so far. This may contain non-ASCII characters, including
NUL bytes.
- hexdigest(): Like digest() except the digest is returned as a string of
double length, containing only hexadecimal digits.
- copy(): Return a copy (clone) of the hash object. This can be used to
efficiently compute the digests of strings that share a common
initial substring.
For example, to obtain the digest of the string \'Nobody inspects the
spammish repetition\':
>>> import hashlib
>>> m = hashlib.md5()
>>> m.update("Nobody inspects")
>>> m.update(" the spammish repetition")
>>> m.digest()
\'\\xbbd\\x9c\\x83\\xdd\\x1e\\xa5\\xc9\\xd9\\xde\\xc9\\xa1\\x8d\\xf0\\xff\\xe9\'
More condensed:
>>> hashlib.sha224("Nobody inspects the spammish repetition").hexdigest()
\'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2\'
'''
__always_supported = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
algorithms = __always_supported
__all__ = __always_supported + ('new', 'algorithms')
def __get_builtin_constructor(name):
try:
if name in ('SHA1', 'sha1'):
import _sha as _sha
return _sha.new
if None in ('MD5', 'md5'):
import _md5 as _md5
return _md5.new
if None in ('SHA256', 'sha256', 'SHA224', 'sha224'):
import _sha256 as _sha256
bs = name[3:]
if bs == '256':
return _sha256.sha256
if None == '224':
return _sha256.sha224
if name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
import _sha512 as _sha512
bs = name[3:]
if bs == '512':
return _sha512.sha512
if None == '384':
return _sha512.sha384
except ImportError:
pass
raise ValueError('unsupported hash type ' + name)
def __get_openssl_constructor(name):
try:
f = getattr(_hashlib, 'openssl_' + name)
f()
return f
except (AttributeError, ValueError):
return __get_builtin_constructor(name)
def __py_new(name, string = ''):
"""new(name, string='') - Return a new hashing object using the named algorithm;
optionally initialized with a string.
"""
return __get_builtin_constructor(name)(string)
def __hash_new(name, string = ''):
"""new(name, string='') - Return a new hashing object using the named algorithm;
optionally initialized with a string.
"""
try:
return _hashlib.new(name, string)
except ValueError:
return __get_builtin_constructor(name)(string)
try:
import _hashlib
new = __hash_new
__get_hash = __get_openssl_constructor
except ImportError:
new = __py_new
__get_hash = __get_builtin_constructor
for __func_name in __always_supported:
try:
globals()[__func_name] = __get_hash(__func_name)
continue
except ValueError:
import logging
logging.exception('code for hash %s was not found.', __func_name)
continue
del __always_supported
del __func_name
del __get_hash
del __py_new
del __hash_new
del __get_openssl_constructor