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Use digest_size from the instance of HMAC instead. digest_size = None class HMAC: """RFC 2104 HMAC class. Also complies with RFC 4231. This supports the API for Cryptographic Hash Functions (PEP 247). """ blocksize = 64 # 512-bit HMAC; can be changed in subclasses. __slots__ = ( "_hmac", "_inner", "_outer", "block_size", "digest_size" ) def __init__(self, key, msg=None, digestmod=''): """Create a new HMAC object. key: bytes or buffer, key for the keyed hash object. msg: bytes or buffer, Initial input for the hash or None. digestmod: A hash name suitable for hashlib.new(). *OR* A hashlib constructor returning a new hash object. *OR* A module supporting PEP 247. Required as of 3.8, despite its position after the optional msg argument. Passing it as a keyword argument is recommended, though not required for legacy API reasons. """ if not isinstance(key, (bytes, bytearray)): raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__) if not digestmod: raise TypeError("Missing required argument 'digestmod'.") if _hashopenssl.get_fips_mode() or (_hashopenssl and isinstance(digestmod, (str, _functype))): try: self._init_hmac(key, msg, digestmod) except _hashopenssl.UnsupportedDigestmodError: if _hashopenssl.get_fips_mode(): raise self._init_old(key, msg, digestmod) else: self._init_old(key, msg, digestmod) def _init_hmac(self, key, msg, digestmod): self._hmac = _hashopenssl.hmac_new(key, msg, digestmod=digestmod) self.digest_size = self._hmac.digest_size self.block_size = self._hmac.block_size def _init_old(self, key, msg, digestmod): if _hashopenssl.get_fips_mode(): # In FIPS mode, use OpenSSL anyway: raise the appropriate error return self._init_hmac(key, msg, digestmod) if callable(digestmod): digest_cons = digestmod elif isinstance(digestmod, str): digest_cons = lambda d=b'': _hashlib.new(digestmod, d) else: digest_cons = lambda d=b'': digestmod.new(d) self._hmac = None self._outer = digest_cons() self._inner = digest_cons() self.digest_size = self._inner.digest_size if hasattr(self._inner, 'block_size'): blocksize = self._inner.block_size if blocksize < 16: _warnings.warn('block_size of %d seems too small; using our ' 'default of %d.' % (blocksize, self.blocksize), RuntimeWarning, 2) blocksize = self.blocksize else: _warnings.warn('No block_size attribute on given digest object; ' 'Assuming %d.' % (self.blocksize), RuntimeWarning, 2) blocksize = self.blocksize if len(key) > blocksize: key = digest_cons(key).digest() # self.blocksize is the default blocksize. self.block_size is # effective block size as well as the public API attribute. self.block_size = blocksize key = key.ljust(blocksize, b'\0') self._outer.update(key.translate(trans_5C)) self._inner.update(key.translate(trans_36)) if msg is not None: self.update(msg) @property def name(self): if self._hmac: return self._hmac.name else: return f"hmac-{self._inner.name}" def update(self, msg): """Feed data from msg into this hashing object.""" inst = self._hmac or self._inner inst.update(msg) def copy(self): """Return a separate copy of this hashing object. An update to this copy won't affect the original object. """ # Call __new__ directly to avoid the expensive __init__. other = self.__class__.__new__(self.__class__) other.digest_size = self.digest_size if self._hmac: other._hmac = self._hmac.copy() other._inner = other._outer = None else: other._hmac = None other._inner = self._inner.copy() other._outer = self._outer.copy() return other def _current(self): """Return a hash object for the current state. To be used only internally with digest() and hexdigest(). """ if self._hmac: return self._hmac else: h = self._outer.copy() h.update(self._inner.digest()) return h def digest(self): """Return the hash value of this hashing object. This returns the hmac value as bytes. The object is not altered in any way by this function; you can continue updating the object after calling this function. """ h = self._current() return h.digest() def hexdigest(self): """Like digest(), but returns a string of hexadecimal digits instead. """ h = self._current() return h.hexdigest() def new(key, msg=None, digestmod=''): """Create a new hashing object and return it. key: bytes or buffer, The starting key for the hash. msg: bytes or buffer, Initial input for the hash, or None. digestmod: A hash name suitable for hashlib.new(). *OR* A hashlib constructor returning a new hash object. *OR* A module supporting PEP 247. Required as of 3.8, despite its position after the optional msg argument. Passing it as a keyword argument is recommended, though not required for legacy API reasons. You can now feed arbitrary bytes into the object using its update() method, and can ask for the hash value at any time by calling its digest() or hexdigest() methods. """ return HMAC(key, msg, digestmod) def digest(key, msg, digest): """Fast inline implementation of HMAC. key: bytes or buffer, The key for the keyed hash object. msg: bytes or buffer, Input message. digest: A hash name suitable for hashlib.new() for best performance. *OR* A hashlib constructor returning a new hash object. *OR* A module supporting PEP 247. """ if _hashopenssl is not None and isinstance(digest, (str, _functype)): try: return _hashopenssl.hmac_digest(key, msg, digest) except _hashopenssl.UnsupportedDigestmodError: pass if callable(digest): digest_cons = digest elif isinstance(digest, str): digest_cons = lambda d=b'': _hashlib.new(digest, d) else: digest_cons = lambda d=b'': digest.new(d) inner = digest_cons() outer = digest_cons() blocksize = getattr(inner, 'block_size', 64) if len(key) > blocksize: key = digest_cons(key).digest() key = key + b'\x00' * (blocksize - len(key)) inner.update(key.translate(trans_36)) outer.update(key.translate(trans_5C)) inner.update(msg) outer.update(inner.digest()) return outer.digest() usr/lib64/python2.7/hmac.py000064400000010754152531537600011345 0ustar00"""HMAC (Keyed-Hashing for Message Authentication) Python module. Implements the HMAC algorithm as described by RFC 2104. """ import warnings as _warnings from operator import _compare_digest as compare_digest trans_5C = "".join ([chr (x ^ 0x5C) for x in xrange(256)]) trans_36 = "".join ([chr (x ^ 0x36) for x in xrange(256)]) # The size of the digests returned by HMAC depends on the underlying # hashing module used. Use digest_size from the instance of HMAC instead. digest_size = None # A unique object passed by HMAC.copy() to the HMAC constructor, in order # that the latter return very quickly. HMAC("") in contrast is quite # expensive. _secret_backdoor_key = [] class HMAC: """RFC 2104 HMAC class. Also complies with RFC 4231. This supports the API for Cryptographic Hash Functions (PEP 247). """ blocksize = 64 # 512-bit HMAC; can be changed in subclasses. def __init__(self, key, msg = None, digestmod = None): """Create a new HMAC object. key: key for the keyed hash object. msg: Initial input for the hash, if provided. digestmod: A module supporting PEP 247. *OR* A hashlib constructor returning a new hash object. Defaults to hashlib.md5. """ if key is _secret_backdoor_key: # cheap return if digestmod is None: import hashlib digestmod = hashlib.md5 if hasattr(digestmod, '__call__'): self.digest_cons = digestmod else: self.digest_cons = lambda d='': digestmod.new(d) self.outer = self.digest_cons() self.inner = self.digest_cons() self.digest_size = self.inner.digest_size if hasattr(self.inner, 'block_size'): blocksize = self.inner.block_size if blocksize < 16: # Very low blocksize, most likely a legacy value like # Lib/sha.py and Lib/md5.py have. _warnings.warn('block_size of %d seems too small; using our ' 'default of %d.' % (blocksize, self.blocksize), RuntimeWarning, 2) blocksize = self.blocksize else: _warnings.warn('No block_size attribute on given digest object; ' 'Assuming %d.' % (self.blocksize), RuntimeWarning, 2) blocksize = self.blocksize if len(key) > blocksize: key = self.digest_cons(key).digest() key = key + chr(0) * (blocksize - len(key)) self.outer.update(key.translate(trans_5C)) self.inner.update(key.translate(trans_36)) if msg is not None: self.update(msg) ## def clear(self): ## raise NotImplementedError, "clear() method not available in HMAC." def update(self, msg): """Update this hashing object with the string msg. """ self.inner.update(msg) def copy(self): """Return a separate copy of this hashing object. An update to this copy won't affect the original object. """ other = self.__class__(_secret_backdoor_key) other.digest_cons = self.digest_cons other.digest_size = self.digest_size other.inner = self.inner.copy() other.outer = self.outer.copy() return other def _current(self): """Return a hash object for the current state. To be used only internally with digest() and hexdigest(). """ h = self.outer.copy() h.update(self.inner.digest()) return h def digest(self): """Return the hash value of this hashing object. This returns a string containing 8-bit data. The object is not altered in any way by this function; you can continue updating the object after calling this function. """ h = self._current() return h.digest() def hexdigest(self): """Like digest(), but returns a string of hexadecimal digits instead. """ h = self._current() return h.hexdigest() def new(key, msg = None, digestmod = None): """Create a new hashing object and return it. key: The starting key for the hash. msg: if available, will immediately be hashed into the object's starting state. You can now feed arbitrary strings into the object using its update() method, and can ask for the hash value at any time by calling its digest() method. """ return HMAC(key, msg, digestmod)