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8bb0b5b03c
bpo-33604: Bump removal notice from 3.6 to 3.8 and change PendingDeprecationWarning to DeprecationWarning as we had intended to do earlier...
189 lines
6.4 KiB
Python
189 lines
6.4 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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import warnings as _warnings
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from _operator import _compare_digest as compare_digest
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try:
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import _hashlib as _hashopenssl
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except ImportError:
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_hashopenssl = None
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_openssl_md_meths = None
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else:
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_openssl_md_meths = frozenset(_hashopenssl.openssl_md_meth_names)
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import hashlib as _hashlib
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trans_5C = bytes((x ^ 0x5C) for x in range(256))
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trans_36 = bytes((x ^ 0x36) for x in range(256))
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# The size of the digests returned by HMAC depends on the underlying
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# hashing module used. Use digest_size from the instance of HMAC instead.
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digest_size = None
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class HMAC:
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"""RFC 2104 HMAC class. Also complies with RFC 4231.
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This supports the API for Cryptographic Hash Functions (PEP 247).
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"""
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blocksize = 64 # 512-bit HMAC; can be changed in subclasses.
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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. *OR*
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A hashlib constructor returning a new hash object. *OR*
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A hash name suitable for hashlib.new().
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Defaults to hashlib.md5.
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Implicit default to hashlib.md5 is deprecated since Python
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3.4 and will be removed in Python 3.8.
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Note: key and msg must be a bytes or bytearray objects.
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"""
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if not isinstance(key, (bytes, bytearray)):
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raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__)
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if digestmod is None:
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_warnings.warn("HMAC() without an explicit digestmod argument "
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"is deprecated since Python 3.4, and will be removed "
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"in 3.8",
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DeprecationWarning, 2)
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digestmod = _hashlib.md5
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if callable(digestmod):
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self.digest_cons = digestmod
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elif isinstance(digestmod, str):
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self.digest_cons = lambda d=b'': _hashlib.new(digestmod, d)
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else:
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self.digest_cons = lambda d=b'': digestmod.new(d)
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self.outer = self.digest_cons()
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self.inner = self.digest_cons()
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self.digest_size = self.inner.digest_size
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if hasattr(self.inner, 'block_size'):
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blocksize = self.inner.block_size
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if blocksize < 16:
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_warnings.warn('block_size of %d seems too small; using our '
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'default of %d.' % (blocksize, self.blocksize),
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RuntimeWarning, 2)
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blocksize = self.blocksize
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else:
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_warnings.warn('No block_size attribute on given digest object; '
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'Assuming %d.' % (self.blocksize),
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RuntimeWarning, 2)
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blocksize = self.blocksize
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# self.blocksize is the default blocksize. self.block_size is
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# effective block size as well as the public API attribute.
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self.block_size = blocksize
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if len(key) > blocksize:
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key = self.digest_cons(key).digest()
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key = key.ljust(blocksize, b'\0')
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self.outer.update(key.translate(trans_5C))
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self.inner.update(key.translate(trans_36))
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if msg is not None:
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self.update(msg)
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@property
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def name(self):
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return "hmac-" + self.inner.name
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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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# Call __new__ directly to avoid the expensive __init__.
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other = self.__class__.__new__(self.__class__)
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other.digest_cons = self.digest_cons
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other.digest_size = self.digest_size
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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 _current(self):
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"""Return a hash object for the current state.
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To be used only internally with digest() and hexdigest().
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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
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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._current()
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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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h = self._current()
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return h.hexdigest()
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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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def digest(key, msg, digest):
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"""Fast inline implementation of HMAC
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key: key for the keyed hash object.
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msg: input message
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digest: A hash name suitable for hashlib.new() for best performance. *OR*
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A hashlib constructor returning a new hash object. *OR*
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A module supporting PEP 247.
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Note: key and msg must be a bytes or bytearray objects.
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"""
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if (_hashopenssl is not None and
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isinstance(digest, str) and digest in _openssl_md_meths):
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return _hashopenssl.hmac_digest(key, msg, digest)
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if callable(digest):
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digest_cons = digest
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elif isinstance(digest, str):
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digest_cons = lambda d=b'': _hashlib.new(digest, d)
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else:
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digest_cons = lambda d=b'': digest.new(d)
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inner = digest_cons()
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outer = digest_cons()
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blocksize = getattr(inner, 'block_size', 64)
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if len(key) > blocksize:
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key = digest_cons(key).digest()
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key = key + b'\x00' * (blocksize - len(key))
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inner.update(key.translate(trans_36))
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outer.update(key.translate(trans_5C))
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inner.update(msg)
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outer.update(inner.digest())
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return outer.digest()
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