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[DIR] asyncio
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[DIR] collections
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[DIR] concurrent
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[DIR] config-3.8-x86_64-linux-gnu
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[DIR] ctypes
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[DIR] curses
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[DIR] dbm
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[DIR] distutils
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[DIR] email
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[DIR] encodings
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[DIR] ensurepip
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[DIR] logging
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[DIR] sqlite3
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[DIR] tkinter
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[DIR] turtledemo
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[DIR] unittest
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[DIR] urllib
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"""HMAC (Keyed-Hashing for Message Authentication) module. Implements the HMAC algorithm as described by RFC 2104. """ import warnings as _warnings from _operator import _compare_digest as compare_digest try: import _hashlib as _hashopenssl except ImportError: _hashopenssl = None _openssl_md_meths = None else: _openssl_md_meths = frozenset(_hashopenssl.openssl_md_meth_names) import hashlib as _hashlib import _hashlib as _hashlibopenssl import _hmacopenssl trans_5C = bytes((x ^ 0x5C) for x in range(256)) trans_36 = bytes((x ^ 0x36) for x in range(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 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=''): """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 _hashlibopenssl.get_fips_mode(): raise ValueError( 'This class is not available in FIPS mode. ' + 'Use hmac.new().' ) 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 parameter 'digestmod'.") if callable(digestmod): self.digest_cons = digestmod elif isinstance(digestmod, str): self.digest_cons = lambda d=b'': _hashlib.new(digestmod, d) else: self.digest_cons = lambda d=b'': 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: _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 # self.blocksize is the default blocksize. self.block_size is # effective block size as well as the public API attribute. self.block_size = blocksize if len(key) > blocksize: key = self.digest_cons(key).digest() 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): return "hmac-" + self.inner.name def update(self, msg): """Feed data from msg into this hashing object.""" if _hashlibopenssl.get_fips_mode(): raise ValueError('hmac.HMAC is not available in FIPS mode') 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. """ # Call __new__ directly to avoid the expensive __init__. other = self.__class__.__new__(self.__class__) 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 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 _get_openssl_name(digestmod): if isinstance(digestmod, str): return digestmod.lower() elif callable(digestmod): digestmod = digestmod(b'') if not isinstance(digestmod, _hashlibopenssl.HASH): raise TypeError( 'Only OpenSSL hashlib hashes are accepted in FIPS mode.') return digestmod.name.lower().replace('_', '-') class HMAC_openssl(_hmacopenssl.HMAC): def __new__(cls, key, msg = None, digestmod = None): if not isinstance(key, (bytes, bytearray)): raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__) name = _get_openssl_name(digestmod) result = _hmacopenssl.HMAC.__new__(cls, key, digestmod=name) if msg: result.update(msg) return result if _hashlibopenssl.get_fips_mode(): HMAC = HMAC_openssl 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) and digest in _openssl_md_meths): return _hashopenssl.hmac_digest(key, msg, digest) 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()
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