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-- |
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:mod:`hashlib` --- Secure hashes and message digests |
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==================================================== |
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.. module:: hashlib |
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:synopsis: Secure hash and message digest algorithms. |
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.. moduleauthor:: Gregory P. Smith <greg@users.sourceforge.net> |
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.. sectionauthor:: Gregory P. Smith <greg@users.sourceforge.net> |
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.. versionadded:: 2.5 |
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.. index:: |
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single: message digest, MD5 |
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single: secure hash algorithm, SHA1, SHA224, SHA256, SHA384, SHA512 |
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This module implements a common interface to many different secure hash and |
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message digest algorithms. Included are the FIPS secure hash algorithms SHA1, |
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SHA224, SHA256, SHA384, and SHA512 (defined in FIPS 180-2) as well as RSA's MD5 |
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algorithm (defined in Internet :rfc:`1321`). The terms secure hash and message |
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digest are interchangeable. Older algorithms were called message digests. The |
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modern term is secure hash. |
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.. note:: |
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If you want the adler32 or crc32 hash functions they are available in |
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the :mod:`zlib` module. |
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.. warning:: |
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Some algorithms have known hash collision weaknesses, see the FAQ at the end. |
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There is one constructor method named for each type of :dfn:`hash`. All return |
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a hash object with the same simple interface. For example: use :func:`sha1` to |
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create a SHA1 hash object. You can now feed this object with arbitrary strings |
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using the :meth:`update` method. At any point you can ask it for the |
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:dfn:`digest` of the concatenation of the strings fed to it so far using the |
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:meth:`digest` or :meth:`hexdigest` methods. |
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.. index:: single: OpenSSL; (use in module hashlib) |
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Constructors for hash algorithms that are always present in this module are |
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:func:`md5`, :func:`sha1`, :func:`sha224`, :func:`sha256`, :func:`sha384`, and |
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:func:`sha512`. Additional algorithms may also be available depending upon the |
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OpenSSL library that Python uses on your platform. |
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For example, to obtain the digest of the string ``'Nobody inspects the spammish |
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repetition'``: |
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>>> import hashlib |
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>>> m = hashlib.md5() |
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>>> m.update("Nobody inspects") |
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>>> m.update(" the spammish repetition") |
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>>> m.digest() |
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'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9' |
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>>> m.digest_size |
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16 |
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>>> m.block_size |
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64 |
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More condensed: |
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>>> hashlib.sha224("Nobody inspects the spammish repetition").hexdigest() |
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'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2' |
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A generic :func:`new` constructor that takes the string name of the desired |
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algorithm as its first parameter also exists to allow access to the above listed |
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hashes as well as any other algorithms that your OpenSSL library may offer. The |
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named constructors are much faster than :func:`new` and should be preferred. |
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Using :func:`new` with an algorithm provided by OpenSSL: |
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>>> h = hashlib.new('ripemd160') |
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>>> h.update("Nobody inspects the spammish repetition") |
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>>> h.hexdigest() |
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'cc4a5ce1b3df48aec5d22d1f16b894a0b894eccc' |
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The following values are provided as constant attributes of the hash objects |
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returned by the constructors: |
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.. data:: digest_size |
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The size of the resulting hash in bytes. |
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.. data:: block_size |
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The internal block size of the hash algorithm in bytes. |
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A hash object has the following methods: |
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.. method:: hash.update(arg) |
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Update the hash object with the string *arg*. Repeated calls are equivalent to |
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a single call with the concatenation of all the arguments: ``m.update(a); |
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m.update(b)`` is equivalent to ``m.update(a+b)``. |
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.. method:: hash.digest() |
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Return the digest of the strings passed to the :meth:`update` method so far. |
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This is a string of :attr:`digest_size` bytes which may contain non-ASCII |
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characters, including null bytes. |
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.. method:: hash.hexdigest() |
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107 |
|
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Like :meth:`digest` except the digest is returned as a string of double length, |
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containing only hexadecimal digits. This may be used to exchange the value |
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safely in email or other non-binary environments. |
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111 |
|
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112 |
|
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113 |
.. method:: hash.copy() |
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114 |
|
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Return a copy ("clone") of the hash object. This can be used to efficiently |
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compute the digests of strings that share a common initial substring. |
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117 |
|
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118 |
|
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119 |
.. seealso:: |
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120 |
|
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121 |
Module :mod:`hmac` |
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A module to generate message authentication codes using hashes. |
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123 |
|
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124 |
Module :mod:`base64` |
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125 |
Another way to encode binary hashes for non-binary environments. |
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126 |
|
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http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf |
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The FIPS 180-2 publication on Secure Hash Algorithms. |
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129 |
|
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http://www.cryptography.com/cnews/hash.html |
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131 |
Hash Collision FAQ with information on which algorithms have known issues and |
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what that means regarding their use. |
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133 |