Added modules to provide AES encryption/decryption support

aespython/aes_cipher.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+"""
+AES Block Cipher.
+
+Performs single block cipher decipher operations on a 16 element list of integers.
+These integers represent 8 bit bytes in a 128 bit block.
+The result of cipher or decipher operations is the transformed 16 element list of integers.
+
+Running this file as __main__ will result in a self-test of the algorithm.
+
+Algorithm per NIST FIPS-197 http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+
+Copyright (c) 2010, Adam Newman http://www.caller9.com/
+Licensed under the MIT license http://www.opensource.org/licenses/mit-license.php
+"""
+__author__ = "Adam Newman"
+
+#Normally use relative import. In test mode use local import.
+try:from .aes_tables import sbox,i_sbox,galI,galNI
+except ValueError:from aes_tables import sbox,i_sbox,galI,galNI
+ups=",".join("s%x"%x for x in range(16))
+upr=ups.replace("s","r")
+mix=",".join(",".join(("g{0}[s%x]^g{1}[s%x]^g{2}[s%x]^g{3}[s%x]^r%x"%(i+(i[0]+(0,3,2,1)[j],))).format(j&3,j+1&3,j+2&3,j+3&3) for j in (0,3,2,1)) for i in ((0,1,2,3),(4,5,6,7),(8,9,10,11),(12,13,14,15))).replace("g2","g").replace("g3","g")
+i=mix.find("g[")
+while i!=-1:
+	mix=mix[:i]+mix[i+2:i+4]+mix[i+5:]
+	i=mix.find("g[",i)
+imix=",".join(",".join(("g{0}[s%x]^g{1}[s%x]^g{2}[s%x]^g{3}[s%x]"%i).format(j&3,j+1&3,j+2&3,j+3&3) for j in (0,3,2,1)) for i in ((0,1,2,3),(4,5,6,7),(8,9,10,11),(12,13,14,15)))
+csl=["s%x"%(x*5&15) for x in range(16)]
+csr=["s%x"%(x*-3&15) for x in range(16)]
+box=",".join("s[%s]"%i for i in csl)
+ibox=",".join("s[%s]^r%x"%i for i in zip(csr,range(16)))
+xor=",".join("s[%s]^r%x"%i for i in zip(csl,range(16)))
+xori=";".join("s%x^=r%x"%(i,i) for i in range(16))
+ciph="""def decipher_block(f,s):
+ g0,g1,g2,g3=galNI;ek=f._expanded_key;S=s+[0]*(16-len(s));s=sbox;R=ek[:16];X
+ for f in range(!16):R=ek[f:f+16];S=B;S=M
+ R=ek[f+16:]
+ return """.replace("S",ups).replace("R",upr).replace("X",xori)
+class AESCipher:
+    def __init__(self,expanded_key):
+        self._expanded_key=expanded_key
+        self._Nr=len(expanded_key)-16
+    exec(ciph.replace("g2,g3","").replace("dec","c").replace("!","16,f._Nr,").replace("B",box).replace("M",mix)+xor)
+    exec(ciph.replace("NI","I").replace(":16","f._Nr:").replace("f+16:",":16").replace("!","f._Nr-16,0,-").replace("sbox","i_sbox").replace("B",ibox).replace("M",imix)+ibox)
+import unittest
+class TestCipher(unittest.TestCase):
+    def test_cipher(self):
+        """Test AES cipher with all key lengths"""
+        import test_keys
+        import key_expander
+        test_data = test_keys.TestKeys()
+        for key_size in 128, 192, 256:
+            test_key_expander = key_expander.KeyExpander(key_size)
+            test_expanded_key = test_key_expander.expand(test_data.test_key[key_size])
+            test_cipher = AESCipher(test_expanded_key)
+            test_result_ciphertext = test_cipher.cipher_block(test_data.test_block_plaintext)
+            self.assertEquals(len([i for i, j in zip(test_result_ciphertext, test_data.test_block_ciphertext_validated[key_size]) if i == j]),
+                16,msg='Test %d bit cipher'%key_size)
+            test_result_plaintext = test_cipher.decipher_block(test_data.test_block_ciphertext_validated[key_size])
+            self.assertEquals(len([i for i, j in zip(test_result_plaintext, test_data.test_block_plaintext) if i == j]),
+                16,msg='Test %d bit decipher'%key_size)
+if __name__ == "__main__":
+    unittest.main()

aespython/aes_tables.py

@@ -0,0 +1,156 @@
+"""
+Instantiate AES tables for rcon,sbox,i_sbox,and galois_lookup.
+
+Copyright (c) 2010,Adam Newman http://www.caller9.com/
+Licensed under the MIT license http://www.opensource.org/licenses/mit-license.php
+"""
+__author__ = "Adam Newman"
+rcon=(
+0x8d,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,0x6c,0xd8,0xab,0x4d,0x9a,
+0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,0xb3,0x7d,0xfa,0xef,0xc5,0x91,0x39,
+0x72,0xe4,0xd3,0xbd,0x61,0xc2,0x9f,0x25,0x4a,0x94,0x33,0x66,0xcc,0x83,0x1d,0x3a,
+0x74,0xe8,0xcb,0x8d,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,0x6c,0xd8,
+0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,0xb3,0x7d,0xfa,0xef,
+0xc5,0x91,0x39,0x72,0xe4,0xd3,0xbd,0x61,0xc2,0x9f,0x25,0x4a,0x94,0x33,0x66,0xcc,
+0x83,0x1d,0x3a,0x74,0xe8,0xcb,0x8d,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,
+0x36,0x6c,0xd8,0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,0xb3,
+0x7d,0xfa,0xef,0xc5,0x91,0x39,0x72,0xe4,0xd3,0xbd,0x61,0xc2,0x9f,0x25,0x4a,0x94,
+0x33,0x66,0xcc,0x83,0x1d,0x3a,0x74,0xe8,0xcb,0x8d,0x01,0x02,0x04,0x08,0x10,0x20,
+0x40,0x80,0x1b,0x36,0x6c,0xd8,0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,
+0x6a,0xd4,0xb3,0x7d,0xfa,0xef,0xc5,0x91,0x39,0x72,0xe4,0xd3,0xbd,0x61,0xc2,0x9f,
+0x25,0x4a,0x94,0x33,0x66,0xcc,0x83,0x1d,0x3a,0x74,0xe8,0xcb,0x8d,0x01,0x02,0x04,
+0x08,0x10,0x20,0x40,0x80,0x1b,0x36,0x6c,0xd8,0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,
+0xc6,0x97,0x35,0x6a,0xd4,0xb3,0x7d,0xfa,0xef,0xc5,0x91,0x39,0x72,0xe4,0xd3,0xbd,
+0x61,0xc2,0x9f,0x25,0x4a,0x94,0x33,0x66,0xcc,0x83,0x1d,0x3a,0x74,0xe8,0xcb)
+sbox=(
+0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
+0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
+0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
+0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
+0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
+0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
+0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
+0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
+0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
+0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
+0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
+0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
+0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
+0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
+0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
+0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16)
+i_sbox=(
+0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb,
+0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb,
+0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e,
+0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25,
+0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92,
+0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84,
+0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06,
+0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b,
+0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73,
+0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e,
+0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b,
+0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4,
+0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f,
+0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef,
+0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61,
+0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d)
+galNI=((
+0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e,
+0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e,
+0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e,
+0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e,
+0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e,0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e,
+0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe,
+0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde,
+0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee,0xf0,0xf2,0xf4,0xf6,0xf8,0xfa,0xfc,0xfe,
+0x1b,0x19,0x1f,0x1d,0x13,0x11,0x17,0x15,0x0b,0x09,0x0f,0x0d,0x03,0x01,0x07,0x05,
+0x3b,0x39,0x3f,0x3d,0x33,0x31,0x37,0x35,0x2b,0x29,0x2f,0x2d,0x23,0x21,0x27,0x25,
+0x5b,0x59,0x5f,0x5d,0x53,0x51,0x57,0x55,0x4b,0x49,0x4f,0x4d,0x43,0x41,0x47,0x45,
+0x7b,0x79,0x7f,0x7d,0x73,0x71,0x77,0x75,0x6b,0x69,0x6f,0x6d,0x63,0x61,0x67,0x65,
+0x9b,0x99,0x9f,0x9d,0x93,0x91,0x97,0x95,0x8b,0x89,0x8f,0x8d,0x83,0x81,0x87,0x85,
+0xbb,0xb9,0xbf,0xbd,0xb3,0xb1,0xb7,0xb5,0xab,0xa9,0xaf,0xad,0xa3,0xa1,0xa7,0xa5,
+0xdb,0xd9,0xdf,0xdd,0xd3,0xd1,0xd7,0xd5,0xcb,0xc9,0xcf,0xcd,0xc3,0xc1,0xc7,0xc5,
+0xfb,0xf9,0xff,0xfd,0xf3,0xf1,0xf7,0xf5,0xeb,0xe9,0xef,0xed,0xe3,0xe1,0xe7,0xe5),
+(0x00,0x03,0x06,0x05,0x0c,0x0f,0x0a,0x09,0x18,0x1b,0x1e,0x1d,0x14,0x17,0x12,0x11,
+0x30,0x33,0x36,0x35,0x3c,0x3f,0x3a,0x39,0x28,0x2b,0x2e,0x2d,0x24,0x27,0x22,0x21,
+0x60,0x63,0x66,0x65,0x6c,0x6f,0x6a,0x69,0x78,0x7b,0x7e,0x7d,0x74,0x77,0x72,0x71,
+0x50,0x53,0x56,0x55,0x5c,0x5f,0x5a,0x59,0x48,0x4b,0x4e,0x4d,0x44,0x47,0x42,0x41,
+0xc0,0xc3,0xc6,0xc5,0xcc,0xcf,0xca,0xc9,0xd8,0xdb,0xde,0xdd,0xd4,0xd7,0xd2,0xd1,
+0xf0,0xf3,0xf6,0xf5,0xfc,0xff,0xfa,0xf9,0xe8,0xeb,0xee,0xed,0xe4,0xe7,0xe2,0xe1,
+0xa0,0xa3,0xa6,0xa5,0xac,0xaf,0xaa,0xa9,0xb8,0xbb,0xbe,0xbd,0xb4,0xb7,0xb2,0xb1,
+0x90,0x93,0x96,0x95,0x9c,0x9f,0x9a,0x99,0x88,0x8b,0x8e,0x8d,0x84,0x87,0x82,0x81,
+0x9b,0x98,0x9d,0x9e,0x97,0x94,0x91,0x92,0x83,0x80,0x85,0x86,0x8f,0x8c,0x89,0x8a,
+0xab,0xa8,0xad,0xae,0xa7,0xa4,0xa1,0xa2,0xb3,0xb0,0xb5,0xb6,0xbf,0xbc,0xb9,0xba,
+0xfb,0xf8,0xfd,0xfe,0xf7,0xf4,0xf1,0xf2,0xe3,0xe0,0xe5,0xe6,0xef,0xec,0xe9,0xea,
+0xcb,0xc8,0xcd,0xce,0xc7,0xc4,0xc1,0xc2,0xd3,0xd0,0xd5,0xd6,0xdf,0xdc,0xd9,0xda,
+0x5b,0x58,0x5d,0x5e,0x57,0x54,0x51,0x52,0x43,0x40,0x45,0x46,0x4f,0x4c,0x49,0x4a,
+0x6b,0x68,0x6d,0x6e,0x67,0x64,0x61,0x62,0x73,0x70,0x75,0x76,0x7f,0x7c,0x79,0x7a,
+0x3b,0x38,0x3d,0x3e,0x37,0x34,0x31,0x32,0x23,0x20,0x25,0x26,0x2f,0x2c,0x29,0x2a,
+0x0b,0x08,0x0d,0x0e,0x07,0x04,0x01,0x02,0x13,0x10,0x15,0x16,0x1f,0x1c,0x19,0x1a))
+galI=(
+(0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a,0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a,
+0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca,0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba,
+0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1,0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81,
+0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11,0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61,
+0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87,0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7,
+0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67,0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17,
+0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c,0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c,
+0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc,0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc,
+0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b,0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b,
+0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b,0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb,
+0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0,0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0,
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+(0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23,0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b,
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+0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8,0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0,
+0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78,0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30,
+0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5,0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed,
+0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35,0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d,
+0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e,0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6,
+0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e,0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46))

aespython/cbc_mode.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+"""
+CBC Mode of operation
+
+Running this file as __main__ will result in a self-test of the algorithm.
+
+Algorithm per NIST SP 800-38A http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
+
+Copyright (c) 2010, Adam Newman http://www.caller9.com/
+Licensed under the MIT license http://www.opensource.org/licenses/mit-license.php
+"""
+__author__ = "Adam Newman"
+
+class CBCMode:
+    """Perform CBC operation on a block and retain IV information for next operation"""
+    def __init__(self, block_cipher, block_size):
+        self._block_cipher = block_cipher
+        self._block_size = block_size
+        self._iv = [0] * block_size
+
+    def set_iv(self, iv):
+        if len(iv) == self._block_size:
+            self._iv = iv
+
+    def encrypt_block(self, plaintext):
+        iv=self._iv=self._block_cipher.cipher_block([i ^ j for i,j in zip (plaintext, self._iv)])
+        return iv
+
+    def decrypt_block(self, ciphertext):
+        plaintext = list(self._block_cipher.decipher_block(ciphertext))
+        for i,v in enumerate(self._iv):plaintext[i]^=v
+        self._iv = ciphertext
+        return plaintext
+
+import unittest
+class TestEncryptionMode(unittest.TestCase):
+    def test_mode(self):
+        #Self test
+        import key_expander
+        import aes_cipher
+        import test_keys
+
+        test_data = test_keys.TestKeys()
+
+        test_expander = key_expander.KeyExpander(256)
+        test_expanded_key = test_expander.expand(test_data.test_mode_key)
+
+        test_cipher = aes_cipher.AESCipher(test_expanded_key)
+
+        test_cbc = CBCMode(test_cipher, 16)
+
+        test_cbc.set_iv(test_data.test_mode_iv)
+        for k in range(4):
+            self.assertEquals(len([i for i, j in zip(test_data.test_cbc_ciphertext[k],test_cbc.encrypt_block(test_data.test_mode_plaintext[k])) if i == j]),
+                16,
+                msg='CBC encrypt test block %d'%k)
+
+        test_cbc.set_iv(test_data.test_mode_iv)
+        for k in range(4):
+            self.assertEquals(len([i for i, j in zip(test_data.test_mode_plaintext[k],test_cbc.decrypt_block(test_data.test_cbc_ciphertext[k])) if i == j]),
+                16,
+                msg='CBC decrypt test block %d'%k)
+
+if __name__ == "__main__":
+    unittest.main()

aespython/cfb_mode.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+"""
+CFB Mode of operation
+
+Running this file as __main__ will result in a self-test of the algorithm.
+
+Algorithm per NIST SP 800-38A http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
+
+Copyright (c) 2010, Adam Newman http://www.caller9.com/
+Licensed under the MIT license http://www.opensource.org/licenses/mit-license.php
+"""
+__author__ = "Adam Newman"
+
+class CFBMode:
+    """Perform CFB operation on a block and retain IV information for next operation"""
+    def __init__(self, block_cipher, block_size):
+        self._block_cipher = block_cipher
+        self._block_size = block_size
+        self._iv = [0] * block_size
+
+    def set_iv(self, iv):
+        if len(iv) == self._block_size:
+            self._iv = iv
+
+    def encrypt_block(self, plaintext):
+        cipher_iv = self._block_cipher.cipher_block(self._iv)
+        iv = self._iv = [i ^ j for i,j in zip (plaintext, cipher_iv)]
+        return iv
+
+    def decrypt_block(self, ciphertext):
+        cipher_iv = self._block_cipher.cipher_block(self._iv)
+        self._iv = ciphertext
+        return [i ^ j for i,j in zip (cipher_iv, ciphertext)]
+
+import unittest
+class TestEncryptionMode(unittest.TestCase):
+    def test_mode(self):
+        #Self test
+        import key_expander
+        import aes_cipher
+        import test_keys
+
+        test_data = test_keys.TestKeys()
+
+        test_expander = key_expander.KeyExpander(256)
+        test_expanded_key = test_expander.expand(test_data.test_mode_key)
+
+        test_cipher = aes_cipher.AESCipher(test_expanded_key)
+
+        test_cfb = CFBMode(test_cipher, 16)
+
+        test_cfb.set_iv(test_data.test_mode_iv)
+        for k in range(4):
+            self.assertEquals(len([i for i, j in zip(test_data.test_cfb_ciphertext[k],test_cfb.encrypt_block(test_data.test_mode_plaintext[k])) if i == j]),
+                16,
+                msg='CFB encrypt test block' + str(k))
+
+        test_cfb.set_iv(test_data.test_mode_iv)
+        for k in range(4):
+            self.assertEquals(len([i for i, j in zip(test_data.test_mode_plaintext[k],test_cfb.decrypt_block(test_data.test_cfb_ciphertext[k])) if i == j]),
+                16,
+                msg='CFB decrypt test block' + str(k))
+
+if __name__ == "__main__":
+    unittest.main()