pwman3/pwman/util/crypto/AES.py

"""

Copyright (c) 2014  Philippe Teuwen <phil@teuwen.org>


Permission is hereby granted, free of charge, to any person obtaining a copy of 
this software and associated documentation files (the "Software"), to deal in 
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
IN THE SOFTWARE.

This code is taken from https://github.com/doegox/python-cryptoplus/

"""
from .blockcipher import *
from .rijndael import rijndael

def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None):
    """Create a new cipher object

    Wrapper for pure python implementation rijndael.py

        key = raw string containing the key, AES-128..256 will be selected according to the key length
            -> when using XTS mode: the key should be a tuple containing the 2 keys needed
        mode = python_AES.MODE_ECB/CBC/CFB/OFB/CTR/XTS/CMAC, default is ECB
            -> for every mode, except ECB and CTR, it is important to construct a seperate cipher for encryption and decryption
        IV = IV as a raw string, default is "all zero" IV
            -> needed for CBC, CFB and OFB mode
        counter = counter object (CryptoPlus.Util.util.Counter)
            -> only needed for CTR mode
            -> use a seperate counter object for the cipher and decipher: the counter is updated directly, not a copy
                see CTR example further on in the docstring
        segment_size = amount of bits to use from the keystream in each chain part
            -> supported values: multiple of 8 between 8 and the blocksize
               of the cipher (only per byte access possible), default is 8
            -> only needed for CFB mode

    Notes:
        - Always construct a seperate cipher object for encryption and decryption. Once a cipher object has been used for encryption,
          it can't be used for decryption because it keeps a state (if necessary) for the IV.

    EXAMPLES:
    **********
    IMPORTING:
    -----------
    >>> from CryptoPlus.Cipher import python_AES

    ECB EXAMPLE:
    -------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F

    >>> cipher = python_AES.new('2b7e151628aed2a6abf7158809cf4f3c'.decode('hex'))
    >>> crypted = cipher.encrypt('6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex'))
    >>> crypted.encode('hex')
    '3ad77bb40d7a3660a89ecaf32466ef97f5d3d58503b9699de785895a96fdbaaf'
    >>> decipher = python_AES.new('2b7e151628aed2a6abf7158809cf4f3c'.decode('hex'))
    >>> decipher.decrypt(crypted).encode('hex')
    '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'

    PADDING EXAMPLE:
    -----------------
    >>> cipher = python_AES.new('0123456789012345')
    >>> crypt = cipher.encrypt('0123456789012')
    >>> crypt += cipher.final()
    >>> decipher = python_AES.new('0123456789012345')
    >>> decipher.decrypt(crypt)
    '0123456789012\\x03\\x03\\x03'

    CBC EXAMPLE (plaintext = 3 blocksizes):
    -----------------------------------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F

    >>> key = ('2b7e151628aed2a6abf7158809cf4f3c').decode('hex')
    >>> IV = ('000102030405060708090a0b0c0d0e0f').decode('hex')
    >>> plaintext1 = ('6bc1bee22e409f96e93d7e117393172a').decode('hex')
    >>> plaintext2 = ('ae2d8a571e03ac9c9eb76fac45af8e51').decode('hex')
    >>> plaintext3 = ('30c81c46a35ce411e5fbc1191a0a52ef').decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CBC,IV)
    >>> ciphertext = cipher.encrypt(plaintext1 + plaintext2 + plaintext3)
    >>> (ciphertext).encode('hex')
    '7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b273bed6b8e3c1743b7116e69e22229516'
    >>> decipher = python_AES.new(key,python_AES.MODE_CBC,IV)
    >>> plaintext = decipher.decrypt(ciphertext)
    >>> (plaintext).encode('hex')
    '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52ef'

    OR: supply plaintext as seperate pieces:
    ------------------------------------------
    >>> cipher = python_AES.new(key,python_AES.MODE_CBC,IV)
    >>> ( cipher.encrypt(plaintext1 + plaintext2[:-2]) ).encode('hex')
    '7649abac8119b246cee98e9b12e9197d'
    >>> ( cipher.encrypt(plaintext2[-2:] + plaintext3) ).encode('hex')
    '5086cb9b507219ee95db113a917678b273bed6b8e3c1743b7116e69e22229516'
    >>> decipher = python_AES.new(key,python_AES.MODE_CBC,IV)
    >>> (decipher.decrypt(ciphertext[:22])).encode('hex')
    '6bc1bee22e409f96e93d7e117393172a'
    >>> (decipher.decrypt(ciphertext[22:])).encode('hex')
    'ae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52ef'

    CFB EXAMPLE: (CFB8-AES192)
    ------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F
    
    >>> key = '2b7e151628aed2a6abf7158809cf4f3c'.decode('hex')
    >>> IV = '000102030405060708090a0b0c0d0e0f'.decode('hex')
    >>> plain = '6bc1bee22e409f96e93d7e117393172a'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CFB,IV=IV,segment_size=8)
    >>> ciphertext = cipher.encrypt(plain)
    >>> ciphertext.encode('hex')
    '3b79424c9c0dd436bace9e0ed4586a4f'
    >>> decipher = python_AES.new(key,python_AES.MODE_CFB,IV)
    >>> decipher.decrypt(ciphertext).encode('hex')
    '6bc1bee22e409f96e93d7e117393172a'

    CFB EXAMPLE: (CFB128-AES192)
    ------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F

    >>> key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'.decode('hex')
    >>> IV = '000102030405060708090a0b0c0d0e0f'.decode('hex')
    >>> plain = '6bc1bee22e409f96e93d7e117393172a'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CFB,IV=IV,segment_size=128)
    >>> output1 = cipher.encrypt(plain)
    >>> output1.encode('hex')
    'cdc80d6fddf18cab34c25909c99a4174'
    >>> plain = 'ae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex')
    >>> output2 = cipher.encrypt(plain)
    >>> output2.encode('hex')
    '67ce7f7f81173621961a2b70171d3d7a'
    >>> decipher = python_AES.new(key,python_AES.MODE_CFB,IV=IV,segment_size=128)
    >>> decipher.decrypt(output1+output2).encode('hex')
    '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'

    CFB EXAMPLE: same as previous but now as a streamcipher
    ------------
    >>> key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'.decode('hex')
    >>> IV = '000102030405060708090a0b0c0d0e0f'.decode('hex')
    >>> plain = '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CFB,IV=IV,segment_size=128)
    >>> output = ''
    >>> for i in plain: output += cipher.encrypt(i)
    >>> output.encode('hex')
    'cdc80d6fddf18cab34c25909c99a417467ce7f7f81173621961a2b70171d3d7a'

    OFB EXAMPLE: (OFB128-AES192)
    ------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F

    >>> key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'.decode('hex')
    >>> IV = '000102030405060708090a0b0c0d0e0f'.decode('hex')
    >>> plain = '6bc1bee22e409f96e93d7e117393172a'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_OFB,IV)
    >>> output1 = cipher.encrypt(plain)
    >>> output1.encode('hex')
    'cdc80d6fddf18cab34c25909c99a4174'
    >>> plain = 'ae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex')
    >>> output2 = cipher.encrypt(plain)
    >>> output2.encode('hex')
    'fcc28b8d4c63837c09e81700c1100401'
    >>> decipher = python_AES.new(key,python_AES.MODE_OFB,IV)
    >>> decipher.decrypt(output1 + output2).encode('hex')
    '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'

    OFB EXAMPLE: same as previous but now as a streamcipher
    ------------
    >>> key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'.decode('hex')
    >>> IV = '000102030405060708090a0b0c0d0e0f'.decode('hex')
    >>> plain = '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_OFB,IV)
    >>> output = ''
    >>> for i in plain: output += cipher.encrypt(i)
    >>> output.encode('hex')
    'cdc80d6fddf18cab34c25909c99a4174fcc28b8d4c63837c09e81700c1100401'


    CTR EXAMPLE:
    ------------
    NIST Special Publication 800-38A http://cryptome.org/bcm/sp800-38a.htm#F

    >>> from CryptoPlus.Util.util import Counter
    >>> key = '2b7e151628aed2a6abf7158809cf4f3c'.decode('hex')
    >>> counter = Counter('f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff'.decode('hex'))
    >>> cipher = python_AES.new(key,python_AES.MODE_CTR,counter=counter)
    >>> plaintext1 = '6bc1bee22e409f96e93d7e117393172a'.decode('hex')
    >>> plaintext2 = 'ae2d8a571e03ac9c9eb76fac45af8e51'.decode('hex')
    >>> plaintext3 = '30c81c46a35ce411e5fbc1191a0a52ef'.decode('hex')
    >>> ciphertext = cipher.encrypt(plaintext1 + plaintext2 + plaintext3)
    >>> ciphertext.encode('hex')
    '874d6191b620e3261bef6864990db6ce9806f66b7970fdff8617187bb9fffdff5ae4df3edbd5d35e5b4f09020db03eab'
    >>> counter2 = Counter('f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff'.decode('hex'))
    >>> decipher = python_AES.new(key,python_AES.MODE_CTR,counter=counter2)
    >>> decipher.decrypt(ciphertext).encode('hex')
    '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52ef'

    XTS EXAMPLE:
    ------------
    XTS-AES-128 applied for a data unit of 512 bytes
    IEEE P1619/D16: http://grouper.ieee.org/groups/1619/email/pdf00086.pdf

    >>> key = ('27182818284590452353602874713526'.decode('hex'),'31415926535897932384626433832795'.decode('hex'))
    >>> plaintext = '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'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plaintext)
    >>> ciphertext.encode('hex')
    '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'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext).encode('hex')
    '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff'

    using data sequence number n

    >>> key = ('fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0'.decode('hex'),'22222222222222222222222222222222'.decode('hex'))
    >>> plain ='4444444444444444444444444444444444444444444444444444444444444444'.decode('hex')
    >>> n = '3333333333'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plain,n)
    >>> ciphertext.encode('hex')
    'af85336b597afc1a900b2eb21ec949d292df4c047e0b21532186a5971a227a89'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext,n).encode('hex')
    '4444444444444444444444444444444444444444444444444444444444444444'

    >>> key = ('27182818284590452353602874713526'.decode('hex'),'31415926535897932384626433832795'.decode('hex'))
    >>> plain ='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'.decode('hex')
    >>> n = 'ff'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> cipher.encrypt(plain,n).encode('hex')
    '3260ae8dad1f4a32c5cafe3ab0eb95549d461a67ceb9e5aa2d3afb62dece0553193ba50c75be251e08d1d08f1088576c7efdfaaf3f459559571e12511753b07af073f35da06af0ce0bbf6b8f5ccc5cea500ec1b211bd51f63b606bf6528796ca12173ba39b8935ee44ccce646f90a45bf9ccc567f0ace13dc2d53ebeedc81f58b2e41179dddf0d5a5c42f5d8506c1a5d2f8f59f3ea873cbcd0eec19acbf325423bd3dcb8c2b1bf1d1eaed0eba7f0698e4314fbeb2f1566d1b9253008cbccf45a2b0d9c5c9c21474f4076e02be26050b99dee4fd68a4cf890e496e4fcae7b70f94ea5a9062da0daeba1993d2ccd1dd3c244b8428801495a58b216547e7e847c46d1d756377b6242d2e5fb83bf752b54e0df71e889f3a2bb0f4c10805bf3c590376e3c24e22ff57f7fa965577375325cea5d920db94b9c336b455f6e894c01866fe9fbb8c8d3f70a2957285f6dfb5dcd8cbf54782f8fe7766d4723819913ac773421e3a31095866bad22c86a6036b2518b2059b4229d18c8c2ccbdf906c6cc6e82464ee57bddb0bebcb1dc645325bfb3e665ef7251082c88ebb1cf203bd779fdd38675713c8daadd17e1cabee432b09787b6ddf3304e38b731b45df5df51b78fcfb3d32466028d0ba36555e7e11ab0ee0666061d1645d962444bc47a38188930a84b4d561395c73c087021927ca638b7afc8a8679ccb84c26555440ec7f10445cd'

    >>> key = ('2718281828459045235360287471352662497757247093699959574966967627'.decode('hex'),'3141592653589793238462643383279502884197169399375105820974944592'.decode('hex'))
    >>> plain ='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'.decode('hex')
    >>> n = 'ffffffffff'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plain,n)
    >>> ciphertext.encode('hex')
    '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'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext,n).encode('hex')
    '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'

    using plaintext not a multiple of 16

    >>> key = ('fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0'.decode('hex'),'bfbebdbcbbbab9b8b7b6b5b4b3b2b1b0'.decode('hex'))
    >>> plaintext = '000102030405060708090a0b0c0d0e0f10111213'.decode('hex')
    >>> n = '9a78563412'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plaintext,n)
    >>> ciphertext.encode('hex')
    '9d84c813f719aa2c7be3f66171c7c5c2edbf9dac'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext,n).encode('hex')
    '000102030405060708090a0b0c0d0e0f10111213'

    >>> key = ('fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0'.decode('hex'),'bfbebdbcbbbab9b8b7b6b5b4b3b2b1b0'.decode('hex'))
    >>> plaintext = '000102030405060708090a0b0c0d0e0f10'.decode('hex')
    >>> n = '9a78563412'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plaintext,n)
    >>> ciphertext.encode('hex')
    '6c1625db4671522d3d7599601de7ca09ed'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext,n).encode('hex')
    '000102030405060708090a0b0c0d0e0f10'

    >>> key = ('e0e1e2e3e4e5e6e7e8e9eaebecedeeef'.decode('hex'),'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf'.decode('hex'))
    >>> plaintext = '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff'.decode('hex')
    >>> n = '21436587a9'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> ciphertext = cipher.encrypt(plaintext,n)
    >>> ciphertext.encode('hex')
    '38b45812ef43a05bd957e545907e223b954ab4aaf088303ad910eadf14b42be68b2461149d8c8ba85f992be970bc621f1b06573f63e867bf5875acafa04e42ccbd7bd3c2a0fb1fff791ec5ec36c66ae4ac1e806d81fbf709dbe29e471fad38549c8e66f5345d7c1eb94f405d1ec785cc6f6a68f6254dd8339f9d84057e01a17741990482999516b5611a38f41bb6478e6f173f320805dd71b1932fc333cb9ee39936beea9ad96fa10fb4112b901734ddad40bc1878995f8e11aee7d141a2f5d48b7a4e1e7f0b2c04830e69a4fd1378411c2f287edf48c6c4e5c247a19680f7fe41cefbd49b582106e3616cbbe4dfb2344b2ae9519391f3e0fb4922254b1d6d2d19c6d4d537b3a26f3bcc51588b32f3eca0829b6a5ac72578fb814fb43cf80d64a233e3f997a3f02683342f2b33d25b492536b93becb2f5e1a8b82f5b883342729e8ae09d16938841a21a97fb543eea3bbff59f13c1a18449e398701c1ad51648346cbc04c27bb2da3b93a1372ccae548fb53bee476f9e9c91773b1bb19828394d55d3e1a20ed69113a860b6829ffa847224604435070221b257e8dff783615d2cae4803a93aa4334ab482a0afac9c0aeda70b45a481df5dec5df8cc0f423c77a5fd46cd312021d4b438862419a791be03bb4d97c0e59578542531ba466a83baf92cefc151b5cc1611a167893819b63fb8a6b18e86de60290fa72b797b0ce59f3'
    >>> decipher = python_AES.new(key,python_AES.MODE_XTS)
    >>> decipher.decrypt(ciphertext,n).encode('hex')
    '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'

    CMAC EXAMPLE:
    -------------
    NIST publication 800-38B: http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf

    >>> key = '2b7e151628aed2a6abf7158809cf4f3c'.decode('hex')
    >>> plaintext = '6bc1bee22e409f96e93d7e117393172a'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CMAC)
    >>> cipher.encrypt(plaintext).encode('hex')[:16]
    '070a16b46b4d4144'

    CMAC EXAMPLE2:
    --------------
    >>> key = '2b7e151628aed2a6abf7158809cf4f3c'.decode('hex')
    >>> plaintext = '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411'.decode('hex')
    >>> cipher = python_AES.new(key,python_AES.MODE_CMAC)
    >>> cipher.encrypt(plaintext).encode('hex')[:16]
    'dfa66747de9ae630'
    """
    return AES(key,mode,IV,counter,segment_size)


block_size = 16

class AES(BlockCipher):
    
    key_error_message = ("Key should be 128, 192 or 256 bits")
    block_size = 16
    
    def __init__(self,key,mode,IV,counter,segment_size):
        cipher_module = rijndael
        self.blocksize = 16
        args = {'block_size':16}
        
        BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size,args)

    def keylen_valid(self,key):
        return len(key) in (16,24,32)

def _test():
    import doctest
    doctest.testmod()

if __name__ == "__main__":
    _test()