author | Shane McErlean <shane.mcerlean@accenture.com> |
Fri, 27 Aug 2010 15:33:49 +0100 | |
changeset 101 | 1e82a8be084a |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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"""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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trans_5C = "".join ([chr (x ^ 0x5C) for x in xrange(256)]) |
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trans_36 = "".join ([chr (x ^ 0x36) for x in xrange(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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# A unique object passed by HMAC.copy() to the HMAC constructor, in order |
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# that the latter return very quickly. HMAC("") in contrast is quite |
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# expensive. |
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_secret_backdoor_key = [] |
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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. |
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Defaults to hashlib.md5. |
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""" |
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if key is _secret_backdoor_key: # cheap |
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return |
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if digestmod is None: |
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import hashlib |
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digestmod = hashlib.md5 |
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if hasattr(digestmod, '__call__'): |
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self.digest_cons = digestmod |
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else: |
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self.digest_cons = lambda d='': 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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# Very low blocksize, most likely a legacy value like |
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# Lib/sha.py and Lib/md5.py have. |
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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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if len(key) > blocksize: |
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key = self.digest_cons(key).digest() |
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key = key + chr(0) * (blocksize - len(key)) |
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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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## 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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87 |
|
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An update to this copy won't affect the original object. |
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""" |
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other = self.__class__(_secret_backdoor_key) |
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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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96 |
|
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def _current(self): |
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"""Return a hash object for the current state. |
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99 |
|
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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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105 |
|
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def digest(self): |
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"""Return the hash value of this hashing object. |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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109 |
This returns a string containing 8-bit data. The object is |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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110 |
not altered in any way by this function; you can continue |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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111 |
updating the object after calling this function. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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112 |
""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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113 |
h = self._current() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return h.digest() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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115 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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116 |
def hexdigest(self): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
"""Like digest(), but returns a string of hexadecimal digits instead. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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118 |
""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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h = self._current() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return h.hexdigest() |
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121 |
|
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122 |
def new(key, msg = None, digestmod = None): |
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"""Create a new hashing object and return it. |
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124 |
|
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125 |
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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127 |
state. |
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128 |
|
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129 |
You can now feed arbitrary strings into the object using its update() |
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130 |
method, and can ask for the hash value at any time by calling its digest() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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131 |
method. |
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132 |
""" |
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return HMAC(key, msg, digestmod) |