AES in Python

aes.py

from __future__ import print_function
import sys
import struct

rcon = [ \
  0x01000000, 0x02000000, 0x04000000, 0x08000000,
  0x10000000, 0x20000000, 0x40000000, 0x80000000,
  0x1b000000, 0x36000000,
]

Te = [ \
  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,
]

Td = [ \
  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,
]

TE = [ \
  0xc66363a5, 0xf87c7c84, 0xee777799, 0xf67b7b8d, 0xfff2f20d, 0xd66b6bbd, 0xde6f6fb1, 0x91c5c554,
  0x60303050, 0x02010103, 0xce6767a9, 0x562b2b7d, 0xe7fefe19, 0xb5d7d762, 0x4dababe6, 0xec76769a,
  0x8fcaca45, 0x1f82829d, 0x89c9c940, 0xfa7d7d87, 0xeffafa15, 0xb25959eb, 0x8e4747c9, 0xfbf0f00b,
  0x41adadec, 0xb3d4d467, 0x5fa2a2fd, 0x45afafea, 0x239c9cbf, 0x53a4a4f7, 0xe4727296, 0x9bc0c05b,
  0x75b7b7c2, 0xe1fdfd1c, 0x3d9393ae, 0x4c26266a, 0x6c36365a, 0x7e3f3f41, 0xf5f7f702, 0x83cccc4f,
  0x6834345c, 0x51a5a5f4, 0xd1e5e534, 0xf9f1f108, 0xe2717193, 0xabd8d873, 0x62313153, 0x2a15153f,
  0x0804040c, 0x95c7c752, 0x46232365, 0x9dc3c35e, 0x30181828, 0x379696a1, 0x0a05050f, 0x2f9a9ab5,
  0x0e070709, 0x24121236, 0x1b80809b, 0xdfe2e23d, 0xcdebeb26, 0x4e272769, 0x7fb2b2cd, 0xea75759f,
  0x1209091b, 0x1d83839e, 0x582c2c74, 0x341a1a2e, 0x361b1b2d, 0xdc6e6eb2, 0xb45a5aee, 0x5ba0a0fb,
  0xa45252f6, 0x763b3b4d, 0xb7d6d661, 0x7db3b3ce, 0x5229297b, 0xdde3e33e, 0x5e2f2f71, 0x13848497,
  0xa65353f5, 0xb9d1d168, 0x00000000, 0xc1eded2c, 0x40202060, 0xe3fcfc1f, 0x79b1b1c8, 0xb65b5bed,
  0xd46a6abe, 0x8dcbcb46, 0x67bebed9, 0x7239394b, 0x944a4ade, 0x984c4cd4, 0xb05858e8, 0x85cfcf4a,
  0xbbd0d06b, 0xc5efef2a, 0x4faaaae5, 0xedfbfb16, 0x864343c5, 0x9a4d4dd7, 0x66333355, 0x11858594,
  0x8a4545cf, 0xe9f9f910, 0x04020206, 0xfe7f7f81, 0xa05050f0, 0x783c3c44, 0x259f9fba, 0x4ba8a8e3,
  0xa25151f3, 0x5da3a3fe, 0x804040c0, 0x058f8f8a, 0x3f9292ad, 0x219d9dbc, 0x70383848, 0xf1f5f504,
  0x63bcbcdf, 0x77b6b6c1, 0xafdada75, 0x42212163, 0x20101030, 0xe5ffff1a, 0xfdf3f30e, 0xbfd2d26d,
  0x81cdcd4c, 0x180c0c14, 0x26131335, 0xc3ecec2f, 0xbe5f5fe1, 0x359797a2, 0x884444cc, 0x2e171739,
  0x93c4c457, 0x55a7a7f2, 0xfc7e7e82, 0x7a3d3d47, 0xc86464ac, 0xba5d5de7, 0x3219192b, 0xe6737395,
  0xc06060a0, 0x19818198, 0x9e4f4fd1, 0xa3dcdc7f, 0x44222266, 0x542a2a7e, 0x3b9090ab, 0x0b888883,
  0x8c4646ca, 0xc7eeee29, 0x6bb8b8d3, 0x2814143c, 0xa7dede79, 0xbc5e5ee2, 0x160b0b1d, 0xaddbdb76,
  0xdbe0e03b, 0x64323256, 0x743a3a4e, 0x140a0a1e, 0x924949db, 0x0c06060a, 0x4824246c, 0xb85c5ce4,
  0x9fc2c25d, 0xbdd3d36e, 0x43acacef, 0xc46262a6, 0x399191a8, 0x319595a4, 0xd3e4e437, 0xf279798b,
  0xd5e7e732, 0x8bc8c843, 0x6e373759, 0xda6d6db7, 0x018d8d8c, 0xb1d5d564, 0x9c4e4ed2, 0x49a9a9e0,
  0xd86c6cb4, 0xac5656fa, 0xf3f4f407, 0xcfeaea25, 0xca6565af, 0xf47a7a8e, 0x47aeaee9, 0x10080818,
  0x6fbabad5, 0xf0787888, 0x4a25256f, 0x5c2e2e72, 0x381c1c24, 0x57a6a6f1, 0x73b4b4c7, 0x97c6c651,
  0xcbe8e823, 0xa1dddd7c, 0xe874749c, 0x3e1f1f21, 0x964b4bdd, 0x61bdbddc, 0x0d8b8b86, 0x0f8a8a85,
  0xe0707090, 0x7c3e3e42, 0x71b5b5c4, 0xcc6666aa, 0x904848d8, 0x06030305, 0xf7f6f601, 0x1c0e0e12,
  0xc26161a3, 0x6a35355f, 0xae5757f9, 0x69b9b9d0, 0x17868691, 0x99c1c158, 0x3a1d1d27, 0x279e9eb9,
  0xd9e1e138, 0xebf8f813, 0x2b9898b3, 0x22111133, 0xd26969bb, 0xa9d9d970, 0x078e8e89, 0x339494a7,
  0x2d9b9bb6, 0x3c1e1e22, 0x15878792, 0xc9e9e920, 0x87cece49, 0xaa5555ff, 0x50282878, 0xa5dfdf7a,
  0x038c8c8f, 0x59a1a1f8, 0x09898980, 0x1a0d0d17, 0x65bfbfda, 0xd7e6e631, 0x844242c6, 0xd06868b8,
  0x824141c3, 0x299999b0, 0x5a2d2d77, 0x1e0f0f11, 0x7bb0b0cb, 0xa85454fc, 0x6dbbbbd6, 0x2c16163a,
]

TD = [ \
  0x51f4a750, 0x7e416553, 0x1a17a4c3, 0x3a275e96, 0x3bab6bcb, 0x1f9d45f1, 0xacfa58ab, 0x4be30393,
  0x2030fa55, 0xad766df6, 0x88cc7691, 0xf5024c25, 0x4fe5d7fc, 0xc52acbd7, 0x26354480, 0xb562a38f,
  0xdeb15a49, 0x25ba1b67, 0x45ea0e98, 0x5dfec0e1, 0xc32f7502, 0x814cf012, 0x8d4697a3, 0x6bd3f9c6,
  0x038f5fe7, 0x15929c95, 0xbf6d7aeb, 0x955259da, 0xd4be832d, 0x587421d3, 0x49e06929, 0x8ec9c844,
  0x75c2896a, 0xf48e7978, 0x99583e6b, 0x27b971dd, 0xbee14fb6, 0xf088ad17, 0xc920ac66, 0x7dce3ab4,
  0x63df4a18, 0xe51a3182, 0x97513360, 0x62537f45, 0xb16477e0, 0xbb6bae84, 0xfe81a01c, 0xf9082b94,
  0x70486858, 0x8f45fd19, 0x94de6c87, 0x527bf8b7, 0xab73d323, 0x724b02e2, 0xe31f8f57, 0x6655ab2a,
  0xb2eb2807, 0x2fb5c203, 0x86c57b9a, 0xd33708a5, 0x302887f2, 0x23bfa5b2, 0x02036aba, 0xed16825c,
  0x8acf1c2b, 0xa779b492, 0xf307f2f0, 0x4e69e2a1, 0x65daf4cd, 0x0605bed5, 0xd134621f, 0xc4a6fe8a,
  0x342e539d, 0xa2f355a0, 0x058ae132, 0xa4f6eb75, 0x0b83ec39, 0x4060efaa, 0x5e719f06, 0xbd6e1051,
  0x3e218af9, 0x96dd063d, 0xdd3e05ae, 0x4de6bd46, 0x91548db5, 0x71c45d05, 0x0406d46f, 0x605015ff,
  0x1998fb24, 0xd6bde997, 0x894043cc, 0x67d99e77, 0xb0e842bd, 0x07898b88, 0xe7195b38, 0x79c8eedb,
  0xa17c0a47, 0x7c420fe9, 0xf8841ec9, 0x00000000, 0x09808683, 0x322bed48, 0x1e1170ac, 0x6c5a724e,
  0xfd0efffb, 0x0f853856, 0x3daed51e, 0x362d3927, 0x0a0fd964, 0x685ca621, 0x9b5b54d1, 0x24362e3a,
  0x0c0a67b1, 0x9357e70f, 0xb4ee96d2, 0x1b9b919e, 0x80c0c54f, 0x61dc20a2, 0x5a774b69, 0x1c121a16,
  0xe293ba0a, 0xc0a02ae5, 0x3c22e043, 0x121b171d, 0x0e090d0b, 0xf28bc7ad, 0x2db6a8b9, 0x141ea9c8,
  0x57f11985, 0xaf75074c, 0xee99ddbb, 0xa37f60fd, 0xf701269f, 0x5c72f5bc, 0x44663bc5, 0x5bfb7e34,
  0x8b432976, 0xcb23c6dc, 0xb6edfc68, 0xb8e4f163, 0xd731dcca, 0x42638510, 0x13972240, 0x84c61120,
  0x854a247d, 0xd2bb3df8, 0xaef93211, 0xc729a16d, 0x1d9e2f4b, 0xdcb230f3, 0x0d8652ec, 0x77c1e3d0,
  0x2bb3166c, 0xa970b999, 0x119448fa, 0x47e96422, 0xa8fc8cc4, 0xa0f03f1a, 0x567d2cd8, 0x223390ef,
  0x87494ec7, 0xd938d1c1, 0x8ccaa2fe, 0x98d40b36, 0xa6f581cf, 0xa57ade28, 0xdab78e26, 0x3fadbfa4,
  0x2c3a9de4, 0x5078920d, 0x6a5fcc9b, 0x547e4662, 0xf68d13c2, 0x90d8b8e8, 0x2e39f75e, 0x82c3aff5,
  0x9f5d80be, 0x69d0937c, 0x6fd52da9, 0xcf2512b3, 0xc8ac993b, 0x10187da7, 0xe89c636e, 0xdb3bbb7b,
  0xcd267809, 0x6e5918f4, 0xec9ab701, 0x834f9aa8, 0xe6956e65, 0xaaffe67e, 0x21bccf08, 0xef15e8e6,
  0xbae79bd9, 0x4a6f36ce, 0xea9f09d4, 0x29b07cd6, 0x31a4b2af, 0x2a3f2331, 0xc6a59430, 0x35a266c0,
  0x744ebc37, 0xfc82caa6, 0xe090d0b0, 0x33a7d815, 0xf104984a, 0x41ecdaf7, 0x7fcd500e, 0x1791f62f,
  0x764dd68d, 0x43efb04d, 0xccaa4d54, 0xe49604df, 0x9ed1b5e3, 0x4c6a881b, 0xc12c1fb8, 0x4665517f,
  0x9d5eea04, 0x018c355d, 0xfa877473, 0xfb0b412e, 0xb3671d5a, 0x92dbd252, 0xe9105633, 0x6dd64713,
  0x9ad7618c, 0x37a10c7a, 0x59f8148e, 0xeb133c89, 0xcea927ee, 0xb761c935, 0xe11ce5ed, 0x7a47b13c,
  0x9cd2df59, 0x55f2733f, 0x1814ce79, 0x73c737bf, 0x53f7cdea, 0x5ffdaa5b, 0xdf3d6f14, 0x7844db86,
  0xcaaff381, 0xb968c43e, 0x3824342c, 0xc2a3405f, 0x161dc372, 0xbce2250c, 0x283c498b, 0xff0d9541,
  0x39a80171, 0x080cb3de, 0xd8b4e49c, 0x6456c190, 0x7bcb8461, 0xd532b670, 0x486c5c74, 0xd0b85742,
]


def rotr32(x, n):
  return (x >> n) + ((x << (32 - n))) & 0xffffffff


Te8 = [x << 8 for x in Te]
Te16 = [x << 16 for x in Te]
Te24 = [x << 24 for x in Te]

Td8 = [x << 8 for x in Td]
Td16 = [x << 16 for x in Td]
Td24 = [x << 24 for x in Td]

TE8 = [rotr32(x, 8) for x in TE]
TE16 = [rotr32(x, 16) for x in TE]
TE24 = [rotr32(x, 24) for x in TE]

TD8 = [rotr32(x, 8) for x in TD]
TD16 = [rotr32(x, 16) for x in TD]
TD24 = [rotr32(x, 24) for x in TD]


def setup_mix(temp):
  return Te24[(temp >> 16) & 0xff] ^ \
         Te16[(temp >> 8) & 0xff] ^ \
          Te8[temp & 0xff] ^ \
           Te[temp >> 24]
       

def setup_mix2(temp):
  return   TD[Te[temp >> 24]] ^ \
          TD8[Te[(temp >> 16) & 0xff]] ^ \
         TD16[Te[(temp >> 8) & 0xff]] ^ \
         TD24[Te[temp & 0xff]]


if sys.hexversion >= 0x03000000:

  def convert(x):
    if isinstance(x, bytes) or isinstance(x, bytearray):
      return x
    if isinstance(x, list) or isinstance(x, tuple):
      return bytes(x)
    return bytes(list(x))

  xrange = range
  aesbytes = bytes

else:

  def convert(x):
    if isinstance(x, bytearray):
      return x
    if isinstance(x, list) or isinstance(x, tuple):
      return bytearray(x)
    if isinstance(x, str):
      return bytearray(map(ord, x))
    return bytearray(list(x))

  aesbytes = str


def aes_expand_enc(key):
  size = len(key)
  if size != 16 and size != 24 and size != 32:
    raise Exception("AES key size should be 128, 192 or 256 bits")
 
  key = convert(key)

  ctx = [0] * (28 + size)
  
  if size == 16:
    ctx[0:4] = struct.unpack(">4I", key)
    for r, i in zip(rcon, xrange(0, 40, 4)):
      ctx[i+4] = ctx[i+0] ^ setup_mix(ctx[i+3]) ^ r
      ctx[i+5] = ctx[i+1] ^ ctx[i+4]
      ctx[i+6] = ctx[i+2] ^ ctx[i+5]
      ctx[i+7] = ctx[i+3] ^ ctx[i+6]

  elif size == 24:
    ctx[0:6] = struct.unpack(">6I", key)
    for r, i in zip(rcon, xrange(0, 48, 6)):
      ctx[i+6] = ctx[i+0] ^ setup_mix(ctx[i+5]) ^ r
      ctx[i+7] = ctx[i+1] ^ ctx[i+6]
      ctx[i+8] = ctx[i+2] ^ ctx[i+7]
      ctx[i+9] = ctx[i+3] ^ ctx[i+8]
      if i < 42:
        ctx[i+10] = ctx[i+4] ^ ctx[i+9]
        ctx[i+11] = ctx[i+5] ^ ctx[i+10]

  elif size == 32:
    ctx[0:8] = struct.unpack(">8I", key)
    for r, i in zip(rcon, xrange(0, 56, 8)):
      ctx[i+8] = ctx[i+0] ^ setup_mix(ctx[i+7]) ^ r
      ctx[i+9] = ctx[i+1] ^ ctx[i+8]
      ctx[i+10] = ctx[i+2] ^ ctx[i+9]
      ctx[i+11] = ctx[i+3] ^ ctx[i+10]
      if i < 48:
        ctx[i+12] = ctx[i+4] ^ setup_mix(rotr32(ctx[i+11], 8))
        ctx[i+13] = ctx[i+5] ^ ctx[i+12]
        ctx[i+14] = ctx[i+6] ^ ctx[i+13]
        ctx[i+15] = ctx[i+7] ^ ctx[i+14]

  return ctx


def aes_expand_dec(key):
  size = len(key)
  if size != 16 and size != 24 and size != 32:
    raise Exception("AES key size should be 128, 192 or 256 bits")

  tmp = aes_expand_enc(key)

  ctx = [0] * (28 + size)
  ctx[0] = tmp[-4]
  ctx[1] = tmp[-3]
  ctx[2] = tmp[-2]
  ctx[3] = tmp[-1]

  for idx in xrange(4, (28+size-4), 4):
    ctx[idx+0] = setup_mix2(tmp[-4-idx])
    ctx[idx+1] = setup_mix2(tmp[-3-idx])
    ctx[idx+2] = setup_mix2(tmp[-2-idx])
    ctx[idx+3] = setup_mix2(tmp[-1-idx])

  ctx[-4] = tmp[0]
  ctx[-3] = tmp[1]
  ctx[-2] = tmp[2]
  ctx[-1] = tmp[3]

  return ctx


def aes_encrypt(key, t0, t1, t2, t3):
  global TE, TE8, TE16, TE24, Te24, Te16, Te8, Te

  s0 = t0 ^ key[0]
  s1 = t1 ^ key[1]
  s2 = t2 ^ key[2]
  s3 = t3 ^ key[3]

  t0 = TE[s0 >> 24] ^ TE8[(s1 >> 16) & 0xff] ^ TE16[(s2 >> 8) & 0xff] ^ TE24[s3 & 0xff] ^ key[4]
  t1 = TE[s1 >> 24] ^ TE8[(s2 >> 16) & 0xff] ^ TE16[(s3 >> 8) & 0xff] ^ TE24[s0 & 0xff] ^ key[5]
  t2 = TE[s2 >> 24] ^ TE8[(s3 >> 16) & 0xff] ^ TE16[(s0 >> 8) & 0xff] ^ TE24[s1 & 0xff] ^ key[6]
  t3 = TE[s3 >> 24] ^ TE8[(s0 >> 16) & 0xff] ^ TE16[(s1 >> 8) & 0xff] ^ TE24[s2 & 0xff] ^ key[7]

  for i in xrange(8, len(key)-4, 8):
    s0 = TE[t0 >> 24] ^ TE8[(t1 >> 16) & 0xff] ^ TE16[(t2 >> 8) & 0xff] ^ TE24[t3 & 0xff] ^ key[i]
    s1 = TE[t1 >> 24] ^ TE8[(t2 >> 16) & 0xff] ^ TE16[(t3 >> 8) & 0xff] ^ TE24[t0 & 0xff] ^ key[i+1]
    s2 = TE[t2 >> 24] ^ TE8[(t3 >> 16) & 0xff] ^ TE16[(t0 >> 8) & 0xff] ^ TE24[t1 & 0xff] ^ key[i+2]
    s3 = TE[t3 >> 24] ^ TE8[(t0 >> 16) & 0xff] ^ TE16[(t1 >> 8) & 0xff] ^ TE24[t2 & 0xff] ^ key[i+3]

    t0 = TE[s0 >> 24] ^ TE8[(s1 >> 16) & 0xff] ^ TE16[(s2 >> 8) & 0xff] ^ TE24[s3 & 0xff] ^ key[i+4]
    t1 = TE[s1 >> 24] ^ TE8[(s2 >> 16) & 0xff] ^ TE16[(s3 >> 8) & 0xff] ^ TE24[s0 & 0xff] ^ key[i+5]
    t2 = TE[s2 >> 24] ^ TE8[(s3 >> 16) & 0xff] ^ TE16[(s0 >> 8) & 0xff] ^ TE24[s1 & 0xff] ^ key[i+6]
    t3 = TE[s3 >> 24] ^ TE8[(s0 >> 16) & 0xff] ^ TE16[(s1 >> 8) & 0xff] ^ TE24[s2 & 0xff] ^ key[i+7]

  s0 = Te24[t0 >> 24] ^ Te16[(t1 >> 16) & 0xff] ^ Te8[(t2 >> 8) & 0xff] ^ Te[t3 & 0xff] ^ key[-4]
  s1 = Te24[t1 >> 24] ^ Te16[(t2 >> 16) & 0xff] ^ Te8[(t3 >> 8) & 0xff] ^ Te[t0 & 0xff] ^ key[-3]
  s2 = Te24[t2 >> 24] ^ Te16[(t3 >> 16) & 0xff] ^ Te8[(t0 >> 8) & 0xff] ^ Te[t1 & 0xff] ^ key[-2]
  s3 = Te24[t3 >> 24] ^ Te16[(t0 >> 16) & 0xff] ^ Te8[(t1 >> 8) & 0xff] ^ Te[t2 & 0xff] ^ key[-1]

  return s0, s1, s2, s3


def aes_decrypt(key, t0, t1, t2, t3):
  global TD, TD8, TD16, TD24, Td24, Td16, Td8, Td

  s0 = t0 ^ key[0]
  s1 = t1 ^ key[1]
  s2 = t2 ^ key[2]
  s3 = t3 ^ key[3]

  t0 = TD[s0 >> 24] ^ TD8[(s3 >> 16) & 0xff] ^ TD16[(s2 >> 8) & 0xff] ^ TD24[s1 & 0xff] ^ key[4]
  t1 = TD[s1 >> 24] ^ TD8[(s0 >> 16) & 0xff] ^ TD16[(s3 >> 8) & 0xff] ^ TD24[s2 & 0xff] ^ key[5]
  t2 = TD[s2 >> 24] ^ TD8[(s1 >> 16) & 0xff] ^ TD16[(s0 >> 8) & 0xff] ^ TD24[s3 & 0xff] ^ key[6]
  t3 = TD[s3 >> 24] ^ TD8[(s2 >> 16) & 0xff] ^ TD16[(s1 >> 8) & 0xff] ^ TD24[s0 & 0xff] ^ key[7]

  for i in xrange(8, len(key)-4, 8):
    s0 = TD[t0 >> 24] ^ TD8[(t3 >> 16) & 0xff] ^ TD16[(t2 >> 8) & 0xff] ^ TD24[t1 & 0xff] ^ key[i]
    s1 = TD[t1 >> 24] ^ TD8[(t0 >> 16) & 0xff] ^ TD16[(t3 >> 8) & 0xff] ^ TD24[t2 & 0xff] ^ key[i+1]
    s2 = TD[t2 >> 24] ^ TD8[(t1 >> 16) & 0xff] ^ TD16[(t0 >> 8) & 0xff] ^ TD24[t3 & 0xff] ^ key[i+2]
    s3 = TD[t3 >> 24] ^ TD8[(t2 >> 16) & 0xff] ^ TD16[(t1 >> 8) & 0xff] ^ TD24[t0 & 0xff] ^ key[i+3]

    t0 = TD[s0 >> 24] ^ TD8[(s3 >> 16) & 0xff] ^ TD16[(s2 >> 8) & 0xff] ^ TD24[s1 & 0xff] ^ key[i+4]
    t1 = TD[s1 >> 24] ^ TD8[(s0 >> 16) & 0xff] ^ TD16[(s3 >> 8) & 0xff] ^ TD24[s2 & 0xff] ^ key[i+5]
    t2 = TD[s2 >> 24] ^ TD8[(s1 >> 16) & 0xff] ^ TD16[(s0 >> 8) & 0xff] ^ TD24[s3 & 0xff] ^ key[i+6]
    t3 = TD[s3 >> 24] ^ TD8[(s2 >> 16) & 0xff] ^ TD16[(s1 >> 8) & 0xff] ^ TD24[s0 & 0xff] ^ key[i+7]

  s0 = Td24[t0 >> 24] ^ Td16[(t3 >> 16) & 0xff] ^ Td8[(t2 >> 8) & 0xff] ^ Td[t1 & 0xff] ^ key[-4]
  s1 = Td24[t1 >> 24] ^ Td16[(t0 >> 16) & 0xff] ^ Td8[(t3 >> 8) & 0xff] ^ Td[t2 & 0xff] ^ key[-3]
  s2 = Td24[t2 >> 24] ^ Td16[(t1 >> 16) & 0xff] ^ Td8[(t0 >> 8) & 0xff] ^ Td[t3 & 0xff] ^ key[-2]
  s3 = Td24[t3 >> 24] ^ Td16[(t2 >> 16) & 0xff] ^ Td8[(t1 >> 8) & 0xff] ^ Td[t0 & 0xff] ^ key[-1]

  return s0, s1, s2, s3


packer = struct.Struct(">4I")

def aes_encrypt_ecb(key, input):
  global packer

  size = len(key)
  if size != 44 and size != 52 and size != 60:
    raise Exception("AES expanded key length should be 44, 52 or 60 bytes")

  if len(input) % 16 != 0:
    raise Exception("input length should be multiple of 16 bytes")

  input = convert(input)
  output = bytearray(len(input))

  for idx in xrange(0, len(input), 16):
    t0, t1, t2, t3 = packer.unpack_from(input, idx)
    s0, s1, s2, s3 = aes_encrypt(key, t0, t1, t2, t3)
    packer.pack_into(output, idx, s0, s1, s2, s3)

  return output


def aes_decrypt_ecb(key, input):
  global packer

  size = len(key)
  if size != 44 and size != 52 and size != 60:
    raise Exception("AES expanded key length should be 44, 52 or 60 bytes")

  if len(input) % 16 != 0:
    raise Exception("input length should be multiple of 16 bytes")

  input = convert(input)
  output = bytearray(len(input))

  for idx in xrange(0, len(input), 16):
    t0, t1, t2, t3 = packer.unpack_from(input, idx)
    s0, s1, s2, s3 = aes_decrypt(key, t0, t1, t2, t3)
    packer.pack_into(output, idx, s0, s1, s2, s3)

  return output


def aes_encrypt_cbc(key, iv, input):
  global packer

  size = len(key)
  if size != 44 and size != 52 and size != 60:
    raise Exception("AES expanded key length should be 44, 52 or 60 bytes")

  input = convert(input)
  iv = convert(iv)

  padding = 16 - len(input) % 16
  input += convert(xrange(1, 1 + padding))
  output = bytearray(len(input))

  s0, s1, s2, s3 = packer.unpack(iv)

  for idx in xrange(0, len(input), 16):
    t0, t1, t2, t3 = packer.unpack_from(input, idx)
    s0, s1, s2, s3 = aes_encrypt(key, t0 ^ s0, t1 ^ s1, t2 ^ s2, t3 ^ s3)
    packer.pack_into(output, idx, s0, s1, s2, s3)

  return output


def aes_decrypt_cbc(key, iv, input):
  size = len(key)
  if size != 44 and size != 52 and size != 60:
    raise Exception("AES expanded key length should be 44, 52 or 60 bytes")

  if len(input) % 16 != 0:
    raise Exception("input length should be multiple of 16 bytes")

  if len(input) == 0:
    raise Exception("input should not be empty")

  iv = convert(iv)
  input = convert(input)
  output = bytearray(len(input))

  s0, s1, s2, s3 = packer.unpack(iv)

  for idx in xrange(0, len(input), 16):
    t0, t1, t2, t3 = packer.unpack_from(input, idx)
    u0, u1, u2, u3 = aes_decrypt(key, t0, t1, t2, t3)
    packer.pack_into(output, idx, u0 ^ s0, u1 ^ s1, u2 ^ s2, u3 ^ s3)
    s0, s1, s2, s3 = t0, t1, t2, t3

  return output[:-output[-1]]


def test():
  from Crypto.Cipher import AES
  from os import urandom
  from sys import stdout
  from time import clock

  for size in [16, 24, 32]:
    print("AES-%i" % (size * 8))

    for i in xrange(64):
      stdout.write(".")

      key = urandom(size)
      plain = urandom(16)

      enc = aes_encrypt_ecb(aes_expand_enc(key), plain)
      assert enc == AES.new(key, AES.MODE_ECB).encrypt(plain)

      dec = aes_decrypt_ecb(aes_expand_dec(key), enc)
      assert dec == AES.new(key, AES.MODE_ECB).decrypt(aesbytes(enc))
      assert dec == plain

    stdout.write("\n")

    for i in xrange(64):
      stdout.write(".")

      padding = 16 - i % 16

      iv = urandom(16)
      key = urandom(size)
      plain = urandom(i)
      plain_padded = convert(plain) + convert(list(xrange(1, 1 + padding)))

      enc = aes_encrypt_cbc(aes_expand_enc(key), iv, plain)
      assert enc == AES.new(key, AES.MODE_CBC, iv).encrypt(aesbytes(plain_padded))

      dec = aes_decrypt_cbc(aes_expand_dec(key), iv, enc)
      assert dec == AES.new(key, AES.MODE_CBC, iv).decrypt(aesbytes(enc))[:i]
      assert dec == plain

    stdout.write("\n")

    ekey = aes_expand_enc([0]*size)
    dkey = aes_expand_dec([0]*size)

    count = 1000
    a = clock()
    for i in xrange(count):
      aes_encrypt(ekey, 0, 0, 0, 0)
    b = clock()
    for i in xrange(count):
      aes_decrypt(dkey, 0, 0, 0, 0)
    c = clock()

    print("Encrypt: %.2f KB/s" % ((16 * count) / 1024 / (b - a)))
    print("Decrypt: %.2f KB/s" % ((16 * count) / 1024 / (c - b)))
    print()

if __name__ == "__main__":
  test()