82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
# $Id: hashlib.py 52533 2006-10-29 18:01:12Z georg.brandl $
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#
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# Copyright (C) 2005 Gregory P. Smith (greg@electricrain.com)
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# Licensed to PSF under a Contributor Agreement.
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#
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__doc__ = """hashlib module - A common interface to many hash functions.
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new(name, string='') - returns a new hash object implementing the
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given hash function; initializing the hash
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using the given string data.
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Named constructor functions are also available, these are much faster
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than using new():
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md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
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More algorithms may be available on your platform but the above are
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guaranteed to exist.
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Choose your hash function wisely. Some have known collision weaknesses.
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sha384 and sha512 will be slow on 32 bit platforms.
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Hash objects have these methods:
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- update(arg): Update the hash object with the string arg. Repeated calls
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are equivalent to a single call with the concatenation of all
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the arguments.
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- digest(): Return the digest of the strings passed to the update() method
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so far. This may contain non-ASCII characters, including
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NUL bytes.
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- hexdigest(): Like digest() except the digest is returned as a string of
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double length, containing only hexadecimal digits.
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- copy(): Return a copy (clone) of the hash object. This can be used to
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efficiently compute the digests of strings that share a common
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initial substring.
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For example, to obtain the digest of the string 'Nobody inspects the
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spammish repetition':
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>>> import hashlib
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>>> m = hashlib.md5()
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>>> m.update("Nobody inspects")
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>>> m.update(" the spammish repetition")
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>>> m.digest()
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'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'
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More condensed:
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>>> hashlib.sha224("Nobody inspects the spammish repetition").hexdigest()
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'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'
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"""
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try:
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import _sechash
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md5 = _sechash.md5
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sha1 = _sechash.sha1
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sha224 = _sechash.sha224
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sha256 = _sechash.sha256
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sha384 = _sechash.sha384
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sha512 = _sechash.sha512
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except ImportError:
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import _hashlib
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md5 = _hashlib.openssl_md5
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sha1 = _hashlib.openssl_sha1
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sha224 = _hashlib.openssl_sha224
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sha256 = _hashlib.openssl_sha256
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sha384 = _hashlib.openssl_sha384
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sha512 = _hashlib.openssl_sha512
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algs = dict()
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for a in [md5, sha1, sha224, sha256, sha384, sha512]:
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algs[a().name.lower()] = a
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def new(name, string=''):
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"""new(name, string='') - Return a new hashing object using the named algorithm;
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optionally initialized with a string.
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"""
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a = algs[name.lower()]
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if a != None:
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return a(string)
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raise ValueError, "unsupported hash type"
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