python 3.7.9导入hashlib和hmac模块出错

def花

TypeError: 'NoneType' object is not iterable

逃兵

hmac.py文件的第十四行报错，不是导入出的错

def花

逃兵 发表于 2021-1-4 09:14
hmac.py文件的第十四行报错，不是导入出的错

1. """HMAC (Keyed-Hashing for Message Authentication) Python module.
   
2. 
   
3. Implements the HMAC algorithm as described by RFC 2104.
   
4. """
   
5. 
   
6. import warnings as _warnings
   
7. from _operator import _compare_digest as compare_digest
   
8. try:
   
9.     import _hashlib as _hashopenssl
   
10. except ImportError:
    
11.     _hashopenssl = None
    
12.     _openssl_md_meths = None
    
13. else:  
    
14.     _openssl_md_meths = frozenset(_hashopenssl.openssl_md_meth_names) # 这里14行出错了。
    
15. import hashlib as _hashlib
    
16. 
    
17. trans_5C = bytes((x ^ 0x5C) for x in range(256))
    
18. trans_36 = bytes((x ^ 0x36) for x in range(256))
    
19. 
    
20. # The size of the digests returned by HMAC depends on the underlying
    
21. # hashing module used.  Use digest_size from the instance of HMAC instead.
    
22. digest_size = None
    
23. 
    
24. 
    
25. 
    
26. class HMAC:
    
27.     """RFC 2104 HMAC class.  Also complies with RFC 4231.
    
28. 
    
29.     This supports the API for Cryptographic Hash Functions (PEP 247).
    
30.     """
    
31.     blocksize = 64  # 512-bit HMAC; can be changed in subclasses.
    
32. 
    
33.     def __init__(self, key, msg = None, digestmod = None):
    
34.         """Create a new HMAC object.
    
35. 
    
36.         key:       key for the keyed hash object.
    
37.         msg:       Initial input for the hash, if provided.
    
38.         digestmod: A module supporting PEP 247.  *OR*
    
39.                    A hashlib constructor returning a new hash object. *OR*
    
40.                    A hash name suitable for hashlib.new().
    
41.                    Defaults to hashlib.md5.
    
42.                    Implicit default to hashlib.md5 is deprecated since Python
    
43.                    3.4 and will be removed in Python 3.8.
    
44. 
    
45.         Note: key and msg must be a bytes or bytearray objects.
    
46.         """
    
47. 
    
48.         if not isinstance(key, (bytes, bytearray)):
    
49.             raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__)
    
50. 
    
51.         if digestmod is None:
    
52.             _warnings.warn("HMAC() without an explicit digestmod argument "
    
53.                            "is deprecated since Python 3.4, and will be removed "
    
54.                            "in 3.8",
    
55.                            DeprecationWarning, 2)
    
56.             digestmod = _hashlib.md5
    
57. 
    
58.         if callable(digestmod):
    
59.             self.digest_cons = digestmod
    
60.         elif isinstance(digestmod, str):
    
61.             self.digest_cons = lambda d=b'': _hashlib.new(digestmod, d)
    
62.         else:
    
63.             self.digest_cons = lambda d=b'': digestmod.new(d)
    
64. 
    
65.         self.outer = self.digest_cons()
    
66.         self.inner = self.digest_cons()
    
67.         self.digest_size = self.inner.digest_size
    
68. 
    
69.         if hasattr(self.inner, 'block_size'):
    
70.             blocksize = self.inner.block_size
    
71.             if blocksize < 16:
    
72.                 _warnings.warn('block_size of %d seems too small; using our '
    
73.                                'default of %d.' % (blocksize, self.blocksize),
    
74.                                RuntimeWarning, 2)
    
75.                 blocksize = self.blocksize
    
76.         else:
    
77.             _warnings.warn('No block_size attribute on given digest object; '
    
78.                            'Assuming %d.' % (self.blocksize),
    
79.                            RuntimeWarning, 2)
    
80.             blocksize = self.blocksize
    
81. 
    
82.         # self.blocksize is the default blocksize. self.block_size is
    
83.         # effective block size as well as the public API attribute.
    
84.         self.block_size = blocksize
    
85. 
    
86.         if len(key) > blocksize:
    
87.             key = self.digest_cons(key).digest()
    
88. 
    
89.         key = key.ljust(blocksize, b'\0')
    
90.         self.outer.update(key.translate(trans_5C))
    
91.         self.inner.update(key.translate(trans_36))
    
92.         if msg is not None:
    
93.             self.update(msg)
    
94. 
    
95.     @property
    
96.     def name(self):
    
97.         return "hmac-" + self.inner.name
    
98. 
    
99.     def update(self, msg):
    
100.         """Update this hashing object with the string msg.
     
101.         """
     
102.         self.inner.update(msg)
     
103. 
     
104.     def copy(self):
     
105.         """Return a separate copy of this hashing object.
     
106. 
     
107.         An update to this copy won't affect the original object.
     
108.         """
     
109.         # Call __new__ directly to avoid the expensive __init__.
     
110.         other = self.__class__.__new__(self.__class__)
     
111.         other.digest_cons = self.digest_cons
     
112.         other.digest_size = self.digest_size
     
113.         other.inner = self.inner.copy()
     
114.         other.outer = self.outer.copy()
     
115.         return other
     
116. 
     
117.     def _current(self):
     
118.         """Return a hash object for the current state.
     
119. 
     
120.         To be used only internally with digest() and hexdigest().
     
121.         """
     
122.         h = self.outer.copy()
     
123.         h.update(self.inner.digest())
     
124.         return h
     
125. 
     
126.     def digest(self):
     
127.         """Return the hash value of this hashing object.
     
128. 
     
129.         This returns a string containing 8-bit data.  The object is
     
130.         not altered in any way by this function; you can continue
     
131.         updating the object after calling this function.
     
132.         """
     
133.         h = self._current()
     
134.         return h.digest()
     
135. 
     
136.     def hexdigest(self):
     
137.         """Like digest(), but returns a string of hexadecimal digits instead.
     
138.         """
     
139.         h = self._current()
     
140.         return h.hexdigest()
     
141. 
     
142. def new(key, msg = None, digestmod = None):
     
143.     """Create a new hashing object and return it.
     
144. 
     
145.     key: The starting key for the hash.
     
146.     msg: if available, will immediately be hashed into the object's starting
     
147.     state.
     
148. 
     
149.     You can now feed arbitrary strings into the object using its update()
     
150.     method, and can ask for the hash value at any time by calling its digest()
     
151.     method.
     
152.     """
     
153.     return HMAC(key, msg, digestmod)
     
154. 
     
155. 
     
156. def digest(key, msg, digest):
     
157.     """Fast inline implementation of HMAC
     
158. 
     
159.     key:    key for the keyed hash object.
     
160.     msg:    input message
     
161.     digest: A hash name suitable for hashlib.new() for best performance. *OR*
     
162.             A hashlib constructor returning a new hash object. *OR*
     
163.             A module supporting PEP 247.
     
164. 
     
165.     Note: key and msg must be a bytes or bytearray objects.
     
166.     """
     
167.     if (_hashopenssl is not None and
     
168.             isinstance(digest, str) and digest in _openssl_md_meths):
     
169.         return _hashopenssl.hmac_digest(key, msg, digest)
     
170. 
     
171.     if callable(digest):
     
172.         digest_cons = digest
     
173.     elif isinstance(digest, str):
     
174.         digest_cons = lambda d=b'': _hashlib.new(digest, d)
     
175.     else:
     
176.         digest_cons = lambda d=b'': digest.new(d)
     
177. 
     
178.     inner = digest_cons()
     
179.     outer = digest_cons()
     
180.     blocksize = getattr(inner, 'block_size', 64)
     
181.     if len(key) > blocksize:
     
182.         key = digest_cons(key).digest()
     
183.     key = key + b'\x00' * (blocksize - len(key))
     
184.     inner.update(key.translate(trans_36))
     
185.     outer.update(key.translate(trans_5C))
     
186.     inner.update(msg)
     
187.     outer.update(inner.digest())
     
188.     return outer.digest()
     

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