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x in string.whitespace => x.isspace() type(x) in types.StringTypes => isinstance(x, basestring) isinstance(x, types.StringTypes) => isinstance(x, basestring) type(x) is types.StringType => isinstance(x, str) type(x) == types.StringType => isinstance(x, str) string.split(x, ...) => x.split(...) string.join(x, y) => y.join(x) string.zfill(x, ...) => x.zfill(...) string.count(x, ...) => x.count(...) hasattr(types, "UnicodeType") => try: unicode except NameError: type(x) != types.TupleTuple => not isinstance(x, tuple) isinstance(x, types.TupleType) => isinstance(x, tuple) type(x) is types.IntType => isinstance(x, int) Do not mention the string module in the rlcompleter docstring. This partially applies SF patch http://www.python.org/sf/562373 (with basestring instead of string). (It excludes the changes to unittest.py and does not change the os.stat stuff.)
98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
"""HMAC (Keyed-Hashing for Message Authentication) Python module.
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Implements the HMAC algorithm as described by RFC 2104.
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"""
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def _strxor(s1, s2):
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"""Utility method. XOR the two strings s1 and s2 (must have same length).
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"""
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return "".join(map(lambda x, y: chr(ord(x) ^ ord(y)), s1, s2))
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# The size of the digests returned by HMAC depends on the underlying
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# hashing module used.
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digest_size = None
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class HMAC:
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"""RFC2104 HMAC class.
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This supports the API for Cryptographic Hash Functions (PEP 247).
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"""
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def __init__(self, key, msg = None, digestmod = None):
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"""Create a new HMAC object.
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key: key for the keyed hash object.
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msg: Initial input for the hash, if provided.
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digestmod: A module supporting PEP 247. Defaults to the md5 module.
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"""
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if digestmod is None:
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import md5
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digestmod = md5
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self.digestmod = digestmod
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self.outer = digestmod.new()
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self.inner = digestmod.new()
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self.digest_size = digestmod.digest_size
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blocksize = 64
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ipad = "\x36" * blocksize
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opad = "\x5C" * blocksize
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if len(key) > blocksize:
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key = digestmod.new(key).digest()
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key = key + chr(0) * (blocksize - len(key))
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self.outer.update(_strxor(key, opad))
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self.inner.update(_strxor(key, ipad))
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if msg is not None:
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self.update(msg)
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## def clear(self):
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## raise NotImplementedError, "clear() method not available in HMAC."
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def update(self, msg):
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"""Update this hashing object with the string msg.
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"""
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self.inner.update(msg)
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def copy(self):
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"""Return a separate copy of this hashing object.
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An update to this copy won't affect the original object.
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"""
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other = HMAC("")
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other.digestmod = self.digestmod
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other.inner = self.inner.copy()
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other.outer = self.outer.copy()
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return other
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def digest(self):
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"""Return the hash value of this hashing object.
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This returns a string containing 8-bit data. The object is
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not altered in any way by this function; you can continue
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updating the object after calling this function.
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"""
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h = self.outer.copy()
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h.update(self.inner.digest())
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return h.digest()
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def hexdigest(self):
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"""Like digest(), but returns a string of hexadecimal digits instead.
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"""
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return "".join([hex(ord(x))[2:].zfill(2)
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for x in tuple(self.digest())])
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def new(key, msg = None, digestmod = None):
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"""Create a new hashing object and return it.
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key: The starting key for the hash.
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msg: if available, will immediately be hashed into the object's starting
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state.
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You can now feed arbitrary strings into the object using its update()
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method, and can ask for the hash value at any time by calling its digest()
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method.
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"""
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return HMAC(key, msg, digestmod)
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