aes.py

#!/usr/bin/env python2

# Copyright (C) 2017  Martijn Terpstra

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Block sizes: 128-bit and 256-bit

# Modes: ECB,CBC,CTR
# CBC and CTR mode automatically append a SHA256-HMAC

import os
from crypturd import pkcs7
from crypturd.sha import add_sha256_hmac, check_sha256_hmac, sha256
from crypturd.common import null_padding, xor_str, RngBase, fixed_length_key

S = [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]

Si = [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]

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, 0x8d]


gfp2 = [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]

gfp3 = [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]

gfp9 = [0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41,
        0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, 0x90, 0x99, 0x82, 0x8b,
        0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5,
        0xee, 0xe7, 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
        0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 0xab, 0xa2,
        0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8,
        0xc7, 0xce, 0xd5, 0xdc, 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b,
        0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01,
        0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7,
        0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, 0x4d, 0x44, 0x5f, 0x56,
        0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28,
        0x33, 0x3a, 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2,
        0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, 0xec, 0xe5,
        0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf,
        0x80, 0x89, 0x92, 0x9b, 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51,
        0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b,
        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]

gfp11 = [0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53,
         0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69, 0xb0, 0xbb, 0xa6, 0xad,
         0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf,
         0xd2, 0xd9, 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a,
         0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, 0xcb, 0xc0,
         0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e,
         0xbf, 0xb4, 0xa9, 0xa2, 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1,
         0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f,
         0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15,
         0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, 0x8d, 0x86, 0x9b, 0x90,
         0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2,
         0xef, 0xe4, 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c,
         0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, 0xf7, 0xfc,
         0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2,
         0x83, 0x88, 0x95, 0x9e, 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60,
         0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e,
         0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf,
         0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, 0x3c, 0x37, 0x2a, 0x21,
         0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43,
         0x5e, 0x55, 0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30,
         0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, 0xb1, 0xba,
         0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4,
         0xc5, 0xce, 0xd3, 0xd8, 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d,
         0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13,
         0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99,
         0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3]

gfp13 = [0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65,
         0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b, 0xd0, 0xdd, 0xca, 0xc7,
         0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81,
         0x96, 0x9b, 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98,
         0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, 0x6b, 0x66,
         0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14,
         0x37, 0x3a, 0x2d, 0x20, 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54,
         0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26,
         0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8,
         0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, 0xd6, 0xdb, 0xcc, 0xc1,
         0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87,
         0x90, 0x9d, 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25,
         0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, 0xda, 0xd7,
         0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5,
         0x86, 0x8b, 0x9c, 0x91, 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33,
         0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41,
         0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04,
         0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, 0xb1, 0xbc, 0xab, 0xa6,
         0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0,
         0xf7, 0xfa, 0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94,
         0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, 0x67, 0x6a,
         0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18,
         0x3b, 0x36, 0x21, 0x2c, 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35,
         0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47,
         0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9,
         0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97]

gfp14 = [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, 0x7a, 0x74, 0x66, 0x68,
         0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c,
         0x2e, 0x20, 0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6,
         0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, 0x0c, 0x02,
         0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e,
         0x44, 0x4a, 0x58, 0x56, 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01,
         0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d,
         0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9,
         0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d]


def expand_key(key, n, b):
    def rotate(b4):
        return b4[1:] + b4[:1]

    def core(b4, i):
        b4 = rotate(b4)
        b4 = [S[c] for c in b4]
        b4[0] ^= rcon[i]
        return b4

    i = 1
    while len(key) < b:
        # first 4 bytes
        t = core(key[-4:], i)
        i += 1
        t = [t[ind] ^ key[ind - n] for ind in range(4)]
        key = key + t
        # next 12 bytes
        for _ in range(3):
            t = [t[ind] ^ key[ind - n] for ind in range(4)]
            key = key + t
        # extra steps for larger key sizes
        if n == 32:
            t = [S[t[ind]] for ind in range(4)]
            t = [t[ind] ^ key[ind - n] for ind in range(4)]
            key = key + t
        if n == 32:
            for _ in range(3):
                t = [t[ind] ^ key[ind - n] for ind in range(4)]
                key = key + t

    return key


def aes128round_keys(key):
    return expand_key(list(map(ord, key)), 16, 176)


def aes256round_keys(key):
    return expand_key(list(map(ord, key)), 32, 240)


def AddRoundKey(block, round_key):
    return [block[ind] ^ round_key[ind] for ind in range(16)]


def SubBytes(block):
    return [S[block[ind]]for ind in range(16)]


def SubBytesInv(block):
    return [Si[block[ind]]for ind in range(16)]


def ShiftRows(block):
    return [block[0], block[5], block[10], block[15],
            block[4], block[9], block[14], block[3],
            block[8], block[13], block[2], block[7],
            block[12], block[1], block[6], block[11]]


def ShiftRowsInv(block):
    return [block[0], block[13], block[10], block[7],
            block[4], block[1], block[14], block[11],
            block[8], block[5], block[2], block[15],
            block[12], block[9], block[6], block[3]]


def MixColumns(block):
    new_block = block[:]
    for i in range(4):
        new_block[i * 4 + 0] = gfp2[block[i * 4]] ^ gfp3[
            block[i * 4 + 1]] ^ block[i * 4 + 2] ^ block[i * 4 + 3]
        new_block[i * 4 + 1] = block[i * 4] ^ gfp2[
            block[i * 4 + 1]] ^ gfp3[block[i * 4 + 2]] ^ block[i * 4 + 3]
        new_block[i * 4 + 2] = block[i * 4] ^ block[
            i * 4 + 1] ^ gfp2[block[i * 4 + 2]] ^ gfp3[block[i * 4 + 3]]
        new_block[i * 4 + 3] = gfp3[block[i * 4]] ^ block[
            i * 4 + 1] ^ block[i * 4 + 2] ^ gfp2[block[i * 4 + 3]]
    return new_block


def MixColumnsInv(block):
    new_block = block[:]
    for i in range(4):
        new_block[i * 4 + 0] = gfp14[block[i * 4]] ^ gfp11[
            block[i * 4 + 1]] ^ gfp13[block[i * 4 + 2]] ^ gfp9[block[i * 4 + 3]]
        new_block[i * 4 + 1] = gfp9[block[i * 4]] ^ gfp14[
            block[i * 4 + 1]] ^ gfp11[block[i * 4 + 2]] ^ gfp13[block[i * 4 + 3]]
        new_block[i * 4 + 2] = gfp13[block[i * 4]] ^ gfp9[
            block[i * 4 + 1]] ^ gfp14[block[i * 4 + 2]] ^ gfp11[block[i * 4 + 3]]
        new_block[i * 4 + 3] = gfp11[block[i * 4]] ^ gfp13[
            block[i * 4 + 1]] ^ gfp9[block[i * 4 + 2]] ^ gfp14[block[i * 4 + 3]]
    return new_block


def advance_counter(counter):
    number_counter = [ord(c) for c in counter]
    overflow = True
    # Update first 64 bits as a big-endian number
    for i in range(8, -1, -1):
        if overflow:
            if number_counter[i] == 255:
                number_counter[i] = 0
                overflow = True
            else:
                number_counter[i] += 1
                overflow = False
    return "".join([chr(c) for c in number_counter])


@add_sha256_hmac
def encrypt_128_cbc(data, key, padding=True, gen_iv=True):
    key = fixed_length_key(key, 16)
    if padding:
        data = pkcs7.add_padding(data, 16)
        r = ""

    if gen_iv:
        iv = os.urandom(16)
        r = iv
    else:
        iv = "\0" * 16
        r = ""

    for i in range(0, len(data), 16):
        cipherblock = aes128enc(xor_str(data[i:i + 16], iv), key)
        r += cipherblock
        iv = cipherblock
    return r


@check_sha256_hmac
def decrypt_128_cbc(data, key, padding=True, gen_iv=True):
    key = fixed_length_key(key, 16)
    r = ""
    if gen_iv:
        iv = data[:16]
        data = data[16:]
    else:
        iv = "\0" * 16

    for i in range(0, len(data), 16):
        cipherblock = data[i:i + 16]
        r += xor_str(aes128dec(cipherblock, key), iv)
        iv = cipherblock

    if padding:
        return pkcs7.remove_padding(r)
    else:
        return r


def encrypt_128_ecb(data, key, padding=True):
    key = fixed_length_key(key, 16)
    r = ""
    if padding:
        data = pkcs7.add_padding(data, 16)
    for i in range(0, len(data), 16):
        r += aes128enc(data[i:i + 16], key)
    return r


def decrypt_128_ecb(data, key, padding=True):
    key = fixed_length_key(key, 16)

    r = ""
    for i in range(0, len(data), 16):
        r += aes128dec(data[i:i + 16], key)
    if padding:
        return pkcs7.remove_padding(r)
    else:
        return r


@add_sha256_hmac
def encrypt_128_ctr(data, key):
    key = fixed_length_key(key, 16)
    counter = os.urandom(16)
    r = counter
    for i in range(0, len(data), 16):
        encrypted_counter = aes128enc(counter, key)
        r += xor_str(encrypted_counter, data[i:i + 16])
        counter = advance_counter(counter)
    return r


@check_sha256_hmac
def decrypt_128_ctr(data, key):
    key = fixed_length_key(key, 16)
    counter = data[:16]
    data = data[16:]
    r = ""
    for i in range(0, len(data), 16):
        encrypted_counter = aes128enc(counter, key)
        r += xor_str(encrypted_counter, data[i:i + 16])
        counter = advance_counter(counter)
    return r


def aes128enc(block, key):
    # expand key
    fullkey = aes128round_keys(key)
    block = [ord(b) for b in block]
    # initial round
    block = AddRoundKey(block, fullkey[:16])
    # Rounds 2-11
    for n in range(1, 10):
        block = SubBytes(block)
        block = ShiftRows(block)
        block = MixColumns(block)
        block = AddRoundKey(block, fullkey[n * 16:n * 16 + 16])
    # final round
    block = SubBytes(block)
    block = ShiftRows(block)
    block = AddRoundKey(block, fullkey[-16:])
    return "".join([chr(b) for b in block])


def aes128dec(block, key):
    # expand key
    fullkey = aes128round_keys(key)
    block = [ord(b) for b in block]

    # undo final round
    final_round_key = fullkey[-16:]

    block = AddRoundKey(block, final_round_key)
    block = ShiftRowsInv(block)
    block = SubBytesInv(block)

    for n in range(9, 0, -1):
        round_key = fullkey[n * 16:n * 16 + 16]

        block = AddRoundKey(block, round_key)
        block = MixColumnsInv(block)
        block = ShiftRowsInv(block)
        block = SubBytesInv(block)

    # Undo initial round
    block = AddRoundKey(block, fullkey[:16])

    return "".join([chr(b) for b in block])


@add_sha256_hmac
def encrypt_256_ctr(data, key):
    key = fixed_length_key(key, 32)
    counter = os.urandom(16)
    r = counter
    for i in range(0, len(data), 16):
        encrypted_counter = aes256enc(counter, key)
        r += xor_str(encrypted_counter, data[i:i + 16])
        counter = advance_counter(counter)
    return r


@check_sha256_hmac
def decrypt_256_ctr(data, key):
    key = fixed_length_key(key, 32)
    counter = data[:16]
    data = data[16:]
    r = ""
    for i in range(0, len(data), 16):
        encrypted_counter = aes256enc(counter, key)
        r += xor_str(encrypted_counter, data[i:i + 16])
        counter = advance_counter(counter)
    return r


@add_sha256_hmac
def encrypt_256_cbc(data, key, padding=True, gen_iv=True):
    key = fixed_length_key(key, 32)
    if padding:
        data = pkcs7.add_padding(data, 16)
        r = ""

    if gen_iv:
        iv = os.urandom(16)
        r = iv
    else:
        iv = "\0" * 16
        r = ""

    for i in range(0, len(data), 16):
        cipherblock = aes256enc(xor_str(data[i:i + 16], iv), key)
        r += cipherblock
        iv = cipherblock
    return r


@check_sha256_hmac
def decrypt_256_cbc(data, key, padding=True, gen_iv=True):
    key = fixed_length_key(key, 32)
    r = ""
    if gen_iv:
        iv = data[:16]
        data = data[16:]
    else:
        iv = "\0" * 16

    for i in range(0, len(data), 16):
        cipherblock = data[i:i + 16]
        r += xor_str(aes256dec(cipherblock, key), iv)
        iv = cipherblock

    if padding:
        return pkcs7.remove_padding(r)
    else:
        return r


def encrypt_256_ecb(data, key, padding=True):
    key = fixed_length_key(key, 32)
    r = ""
    if padding:
        data = pkcs7.add_padding(data, 16)
    for i in range(0, len(data), 16):
        r += aes256enc(data[i:i + 16], key)
    return r


def decrypt_256_ecb(data, key, padding=True):
    key = fixed_length_key(key, 32)
    r = ""
    for i in range(0, len(data), 16):
        r += aes256dec(data[i:i + 16], key)
    if padding:
        return pkcs7.remove_padding(r)
    else:
        return r


def aes256enc(block, key):
    # expand key
    fullkey = aes256round_keys(key)
    block = [ord(b) for b in block]
    # initial round
    block = AddRoundKey(block, fullkey[:16])
    # Rounds 2-11
    for n in range(1, 14):
        block = SubBytes(block)
        block = ShiftRows(block)
        block = MixColumns(block)
        block = AddRoundKey(block, fullkey[n * 16:n * 16 + 16])
    # final round
    block = SubBytes(block)
    block = ShiftRows(block)
    block = AddRoundKey(block, fullkey[-16:])
    return "".join([chr(b) for b in block])


def aes256dec(block, key):
    # expand key
    fullkey = aes256round_keys(key)
    block = [ord(b) for b in block]

    # undo final round
    final_round_key = fullkey[-16:]

    block = AddRoundKey(block, final_round_key)
    block = ShiftRowsInv(block)
    block = SubBytesInv(block)

    for n in range(13, 0, -1):
        round_key = fullkey[n * 16:n * 16 + 16]

        block = AddRoundKey(block, round_key)
        block = MixColumnsInv(block)
        block = ShiftRowsInv(block)
        block = SubBytesInv(block)

    # Undo initial round
    block = AddRoundKey(block, fullkey[:16])

    return "".join([chr(b) for b in block])


class RNG_CTR(RngBase):

    "A Random number generator based of AES-128-CTR"

    def __init__(self):
        self.key = os.urandom(16)
        self.counter = os.urandom(16)
        self.buf = ""

    def update_buffer(self):
        self.buf += aes128enc(self.counter, self.key)
        self.counter = advance_counter(self.counter)

    def rand_int8(self):
        "return a psuedorandom integer mod 256"
        if len(self.buf) < 1:
            self.update_buffer()
        r = ord(self.buf[0])
        self.buf = self.buf[1:]
        return r


def cbc_mac(data, key):
    key = fixed_length_key(key, 16)
    data = pkcs7.add_padding(data, 16)
    iv = "\0" * 16
    r = ""
    for i in range(0, len(data), 16):
        cipherblock = aes128enc(xor_str(data[i:i + 16], iv), key)
        r += cipherblock
        iv = cipherblock
    return iv

# Defaults
rand = RNG_CTR().rand
encrypt = encrypt_256_ctr
decrypt = decrypt_256_ctr