aes

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#=======================================================================
#
# aes_key_gen.py
# -------------
# Simple, pure Python test model of the AES key generation.
#
#
# Author: Joachim Strömbergson
# Copyright (c) 2014, Secworks Sweden AB
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or 
# without modification, are permitted provided that the following 
# conditions are met: 
# 
# 1. Redistributions of source code must retain the above copyright 
#    notice, this list of conditions and the following disclaimer. 
# 
# 2. Redistributions in binary form must reproduce the above copyright 
#    notice, this list of conditions and the following disclaimer in 
#    the documentation and/or other materials provided with the 
#    distribution. 
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#=======================================================================

#-------------------------------------------------------------------
# Python module imports.
#-------------------------------------------------------------------
import sys


#-------------------------------------------------------------------
# Constants.
#-------------------------------------------------------------------
VERBOSE = True

AES_128_ROUNDS = 10
AES_192_ROUNDS = 12
AES_256_ROUNDS = 14


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]


#-------------------------------------------------------------------
# substw()
#
# Returns a 32-bit word in which each of the bytes in the
# given 32-bit word has been used as lookup into the AES S-box.
#-------------------------------------------------------------------
def substw(w):
    b0 = w >> 24
    b1 = w >> 16 & 0xff
    b2 = w >> 8 & 0xff
    b3 = w & 0xff

    s0 = sbox[b0]
    s1 = sbox[b1]
    s2 = sbox[b2]
    s3 = sbox[b3]

    return (s0 << 24) + (s1 << 16) + (s2 << 8) + s3


#-------------------------------------------------------------------
# rol8()
#
# Rotate the given 32 bit word 8 bits left.
#-------------------------------------------------------------------
def rol8(w):
    return ((w << 8) | (w >> 24)) & 0xffffffff


#-------------------------------------------------------------------
# next_words()
#
# Generate the next four key words based on given rcon and
# previous key words.
#-------------------------------------------------------------------
def next_words(prev_words, rcon):
    (prev_x0, prev_x1, prev_x2, prev_x3) = prev_words
    tmp = substw(rol8(prev_x3)) ^ (rcon << 24)
    x0 = prev_x0 ^ tmp
    x1 = prev_x1 ^ x0
    x2 = prev_x2 ^ x1
    x3 = prev_x3 ^ x2
    return (x0, x1, x2, x3)


#-------------------------------------------------------------------
# key_gen()
#
# The actual key generation.
#-------------------------------------------------------------------
def key_gen(key):
    nr_rounds = {4:AES_128_ROUNDS, 6:AES_192_ROUNDS, 8:AES_256_ROUNDS}[len(key)]
    if VERBOSE:
        print("Generating keys for AES-%d." % (len(key) * 32))

    round_keys = []
    if nr_rounds == AES_128_ROUNDS:
        round_keys.append(key)

    elif nr_rounds == AES_192_ROUNDS:
        (k0, k1, k2, k3, k4, k5) = key
        round_keys.append((k0, k1, k2, k3))
        rcon = ((0x8d << 1) ^ (0x11b & - (0x8d >> 7))) & 0xff
        (x0, x1, x2, x3) = next_words((k0, k1, k2, k3), rcon)
        round_keys.append((k4, k5, x2, x3))
        nr_rounds -= 1

    else:
        # nr_rounds == AES_192_ROUNDS
        (k0, k1, k2, k3, k4, k5, k6, k7) = key
        round_keys.append((k0, k1, k2, k3))
        round_keys.append((k4, k5, k6, k7))
        nr_rounds -= 1

    rcon = 0x8d

    for i in range(0, nr_rounds):
        rcon = ((rcon << 1) ^ (0x11b & - (rcon >> 7))) & 0xff
        round_keys.append(next_words(round_keys[i], rcon))

    return round_keys


#-------------------------------------------------------------------
# sam_rcon()
#
# Function implementation of rcon. Calculates rcon for a
# given round. This could be implemented as an iterator
#-------------------------------------------------------------------
def sam_rcon(round):
    rcon = 0x8d

    for i in range(0, round):
        rcon = ((rcon << 1) ^ (0x11b & - (rcon >> 7))) & 0xff

    return rcon


#-------------------------------------------------------------------
# sam_schedule_core()
#
# Perform the rotate and SubBytes operation used in all schedules.
#-------------------------------------------------------------------
def sam_schedule_core(word, i):
    # Rotate one byte left
    word = word[1 : 4] + [word[0]]

    # Perform SubBytes on all bytes in the word.
    for a in range(4):
        word[a] = sbox[word[a]]

    # XOR with rcon on the first byte
    rcon = sam_rcon(i)
    print("rcon = 0x%02x" % rcon)
    word[0] = word[0] ^ rcon

    return word


#-------------------------------------------------------------------
# sam_128_bit_key_expansion()
#
# Byte based key expansion for 128 bit keys by Sam Trenholme:
# http://www.samiam.org/key-schedule.html
#
# the key here should be supplied as an array of bytes.
# The array will be updated during processing.
#-------------------------------------------------------------------
def sam_128_bit_key_expansion(key):
    t = [0] * 4
    expkey = [0x0] * (11 * 16)
    expkey[0:15] = key[:]

    # c is 16 because the first sub-key is the user-supplied key
    c = 16;
    i = 1;

    # We need 11 sets of sixteen bytes each for 128-bit mode
    # 11 * 16 = 176
    while (c < 176):
        # Copy the temporary variable over from the last 4-byte block
        for a in range(4):
            t[a] = expkey[a + c - 4]

        # Every four blocks (of four bytes), do a complex calculation */
        if (c % 16 == 0):
            t = sam_schedule_core(t, i)
        i += 1

        # New key is old key xored with the copied and possibly
        # transformed word.
        for a in range(4):
            expkey[c] = expkey[c - 16] ^ t[a]
        c += 1

    return expkey


#-------------------------------------------------------------------
# sam_192_bit_key_expansion()
#
# Byte based key expansion for 192 bit keys by Sam Trenholme:
# http://www.samiam.org/key-schedule.html
#-------------------------------------------------------------------
def sam_192_bit_key_expansion(key):
    pass
#void expand_key(unsigned char *key) {
#        unsigned char t[4];
#        unsigned char c = 24;
#	unsigned char i = 1;
#        unsigned char a;
#        while(c < 208) {
#                /* Copy the temporary variable over */
#                for(a = 0; a < 4; a++) 
#                        t[a] = key[a + c - 4]; 
#                /* Every six sets, do a complex calculation */
#                if(c % 24 == 0) {
#                        schedule_code(t,i);
#			i++;
#		}
#                for(a = 0; a < 4; a++) {
#                        key[c] = key[c - 24] ^ t[a];
#                        c++;
#                }
#        }
#}




#-------------------------------------------------------------------
# sam_256_bit_key_expansion()
#
# Byte based key expansion for 256 bit keys by Sam Trenholme:
# http://www.samiam.org/key-schedule.html
#-------------------------------------------------------------------
def sam_256_bit_key_expansion(key):
    pass
#void expand_key(unsigned char *key) {
#        unsigned char t[4];
#        unsigned char c = 32;
#	unsigned char i = 1;
#        unsigned char a;
#        while(c < 240) {
#                /* Copy the temporary variable over */
#                for(a = 0; a < 4; a++) 
#                        t[a] = key[a + c - 4]; 
#                /* Every eight sets, do a complex calculation */
#                if(c % 32 == 0) {
#                        schedule_core(t,i);
#			i++;
#		}
#                /* For 256-bit keys, we add an extra sbox to the
#                 * calculation */
#                if(c % 32 == 16) {
#                        for(a = 0; a < 4; a++) 
#                                t[a] = sbox(t[a]);
#                }
#                for(a = 0; a < 4; a++) {
#                        key[c] = key[c - 32] ^ t[a];
#                        c++;
#                }
#        }
#}


#-------------------------------------------------------------------
# print_bytekeys()
#
# Print a set of round keys given as an array of bytes.
#-------------------------------------------------------------------
def print_bytekeys(keys):
    i = 0
    print("Number of round keys: %d" % (int(len(keys) / 16)))
    while i < (len(keys) - 1):
        for j in range(16):
            print("0x%02x " % keys[i + j], end="")
        print("")
        i += 16
        

#-------------------------------------------------------------------
# test_key()
#
# Generate round keys for a given key and compare them to
# the given expected round keys.
#-------------------------------------------------------------------
def test_key(key, expected):
    if len(key) not in [4, 6, 8]:
        print("Error: Key is %d bits, not 128, 192 or 256 bits" % (len(key) * 32))
        return

    generated = key_gen(key)

    if (len(generated) != len(expected)):
        print("Error: Incorrect number of keys generated.")
        print("Expected number of round keys: %d" % len(expected))
        print("Got number of round keys:      %d" % len(generated))

    for i in range(len(generated)):
        exp = expected[i]
        got = generated[i]
        if (exp != got):
            print("Error: Error in round key %d." % i)
            (e0, e1, e2, e3) = exp
            (g0, g1, g2, g3) = got
            print("Expected: 0x%08x 0x%08x 0x%08x 0x%08x"\
                  % (e0, e1, e2, e3))
            print("Got:      0x%08x 0x%08x 0x%08x 0x%08x"\
                  % (g0, g1, g2, g3))


#-------------------------------------------------------------------
# test_key_expansion()
#
# Perform key expansion tests.
# The test keys and expected round keys are taken from:
# http://www.samiam.org/key-schedule.html
#-------------------------------------------------------------------
def test_key_expansion():
    # recon-test
    print("rcon test:")
    for i in range(20):
        print("rcon %02d = 0x%02x" % (i, sam_rcon(i)))

    # Test of sam-implementations.
    sam_key128_1 = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]

    my_expkey = sam_128_bit_key_expansion(sam_key128_1)
    print_bytekeys(my_expkey)


    # 128 bit keys.
#    key128_1 = (0x00000000, 0x00000000, 0x00000000, 0x00000000)
#    exp128_1 = ((0x00000000, 0x00000000, 0x00000000, 0x00000000),
#                (0x62636363, 0x62636363, 0x62636363, 0x62636363),
#                (0x9b9898c9, 0xf9fbfbaa, 0x9b9898c9, 0xf9fbfbaa),
#                (0x90973450, 0x696ccffa, 0xf2f45733, 0x0b0fac99),
#                (0xee06da7b, 0x876a1581, 0x759e42b2, 0x7e91ee2b),
#                (0x7f2e2b88, 0xf8443e09, 0x8dda7cbb, 0xf34b9290),
#                (0xec614b85, 0x1425758c, 0x99ff0937, 0x6ab49ba7),
#                (0x21751787, 0x3550620b, 0xacaf6b3c, 0xc61bf09b),
#                (0x0ef90333, 0x3ba96138, 0x97060a04, 0x511dfa9f),
#                (0xb1d4d8e2, 0x8a7db9da, 0x1d7bb3de, 0x4c664941),
#                (0xb4ef5bcb, 0x3e92e211, 0x23e951cf, 0x6f8f188e))
#
#    key128_2 = (0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff)
#    exp128_2 = ((0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff),
#                (0xe8e9e9e9, 0x17161616, 0xe8e9e9e9, 0x17161616),
#                (0xadaeae19, 0xbab8b80f, 0x525151e6, 0x454747f0),
#                (0x090e2277, 0xb3b69a78, 0xe1e7cb9e, 0xa4a08c6e),
#                (0xe16abd3e, 0x52dc2746, 0xb33becd8, 0x179b60b6),
#                (0xe5baf3ce, 0xb766d488, 0x045d3850, 0x13c658e6),
#                (0x71d07db3, 0xc6b6a93b, 0xc2eb916b, 0xd12dc98d),
#                (0xe90d208d, 0x2fbb89b6, 0xed5018dd, 0x3c7dd150),
#                (0x96337366, 0xb988fad0, 0x54d8e20d, 0x68a5335d),
#                (0x8bf03f23, 0x3278c5f3, 0x66a027fe, 0x0e0514a3),
#                (0xd60a3588, 0xe472f07b, 0x82d2d785, 0x8cd7c326))
#
#    key128_3 = (0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f)
#    exp128_3 = ((0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f),
#                (0xd6aa74fd, 0xd2af72fa, 0xdaa678f1, 0xd6ab76fe),
#                (0xb692cf0b, 0x643dbdf1, 0xbe9bc500, 0x6830b3fe),
#                (0xb6ff744e, 0xd2c2c9bf, 0x6c590cbf, 0x0469bf41),
#                (0x47f7f7bc, 0x95353e03, 0xf96c32bc, 0xfd058dfd),
#                (0x3caaa3e8, 0xa99f9deb, 0x50f3af57, 0xadf622aa),
#                (0x5e390f7d, 0xf7a69296, 0xa7553dc1, 0x0aa31f6b),
#                (0x14f9701a, 0xe35fe28c, 0x440adf4d, 0x4ea9c026),
#                (0x47438735, 0xa41c65b9, 0xe016baf4, 0xaebf7ad2),
#                (0x549932d1, 0xf0855768, 0x1093ed9c, 0xbe2c974e),
#                (0x13111d7f, 0xe3944a17, 0xf307a78b, 0x4d2b30c5))
#
#    key128_4 = (0x6920e299, 0xa5202a6d, 0x656e6368, 0x69746f2a)
#    exp128_4 = ((0x6920e299, 0xa5202a6d, 0x656e6368, 0x69746f2a),
#                (0xfa880760, 0x5fa82d0d, 0x3ac64e65, 0x53b2214f),
#                (0xcf75838d, 0x90ddae80, 0xaa1be0e5, 0xf9a9c1aa),
#                (0x180d2f14, 0x88d08194, 0x22cb6171, 0xdb62a0db),
#                (0xbaed96ad, 0x323d1739, 0x10f67648, 0xcb94d693),
#                (0x881b4ab2, 0xba265d8b, 0xaad02bc3, 0x6144fd50),
#                (0xb34f195d, 0x096944d6, 0xa3b96f15, 0xc2fd9245),
#                (0xa7007778, 0xae6933ae, 0x0dd05cbb, 0xcf2dcefe),
#                (0xff8bccf2, 0x51e2ff5c, 0x5c32a3e7, 0x931f6d19),
#                (0x24b7182e, 0x7555e772, 0x29674495, 0xba78298c),
#                (0xae127cda, 0xdb479ba8, 0xf220df3d, 0x4858f6b1))
#
#    # 192 bit keys.
#    key192_1 = (0x00000000, 0x00000000, 0x00000000,
#                0x00000000, 0x00000000, 0x00000000)
#    exp192_1 = ((0x00000000, 0x00000000, 0x00000000, 0x00000000),
#                (0x00000000, 0x00000000, 0x62636363, 0x62636363),
#                (0x62636363, 0x62636363, 0x62636363, 0x62636363),
#                (0x9b9898c9, 0xf9fbfbaa, 0x9b9898c9, 0xf9fbfbaa),
#                (0x9b9898c9, 0xf9fbfbaa, 0x90973450, 0x696ccffa),
#                (0xf2f45733, 0x0b0fac99, 0x90973450, 0x696ccffa),
#                (0xc81d19a9, 0xa171d653, 0x53858160, 0x588a2df9),
#                (0xc81d19a9, 0xa171d653, 0x7bebf49b, 0xda9a22c8),
#                (0x891fa3a8, 0xd1958e51, 0x198897f8, 0xb8f941ab),
#                (0xc26896f7, 0x18f2b43f, 0x91ed1797, 0x407899c6),
#                (0x59f00e3e, 0xe1094f95, 0x83ecbc0f, 0x9b1e0830),
#                (0x0af31fa7, 0x4a8b8661, 0x137b885f, 0xf272c7ca),
#                (0x432ac886, 0xd834c0b6, 0xd2c7df11, 0x984c5970))
#
#    key192_2 = (0xffffffff, 0xffffffff, 0xffffffff,
#                0xffffffff, 0xffffffff, 0xffffffff)
#    exp192_2 = ((0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff),
#                (0xffffffff, 0xffffffff, 0xe8e9e9e9, 0x17161616),
#                (0xe8e9e9e9, 0x17161616, 0xe8e9e9e9, 0x17161616),
#                (0xadaeae19, 0xbab8b80f, 0x525151e6, 0x454747f0),
#                (0xadaeae19, 0xbab8b80f, 0xc5c2d8ed, 0x7f7a60e2),
#                (0x2d2b3104, 0x686c76f4, 0xc5c2d8ed, 0x7f7a60e2),
#                (0x1712403f, 0x686820dd, 0x454311d9, 0x2d2f672d),
#                (0xe8edbfc0, 0x9797df22, 0x8f8cd3b7, 0xe7e4f36a),
#                (0xa2a7e2b3, 0x8f88859e, 0x67653a5e, 0xf0f2e57c),
#                (0x2655c33b, 0xc1b13051, 0x6316d2e2, 0xec9e577c),
#                (0x8bfb6d22, 0x7b09885e, 0x67919b1a, 0xa620ab4b),
#                (0xc53679a9, 0x29a82ed5, 0xa25343f7, 0xd95acba9),
#                (0x598e482f, 0xffaee364, 0x3a989acd, 0x1330b418))
#
#    key192_3 = (0x00010203, 0x04050607, 0x08090a0b,
#                0x0c0d0e0f, 0x10111213, 0x14151617)
#    exp192_3 = ((0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f),
#                (0x10111213, 0x14151617, 0x5846f2f9, 0x5c43f4fe),
#                (0x544afef5, 0x5847f0fa, 0x4856e2e9, 0x5c43f4fe),
#                (0x40f949b3, 0x1cbabd4d, 0x48f043b8, 0x10b7b342),
#                (0x58e151ab, 0x04a2a555, 0x7effb541, 0x6245080c),
#                (0x2ab54bb4, 0x3a02f8f6, 0x62e3a95d, 0x66410c08),
#                (0xf5018572, 0x97448d7e, 0xbdf1c6ca, 0x87f33e3c),
#                (0xe5109761, 0x83519b69, 0x34157c9e, 0xa351f1e0),
#                (0x1ea0372a, 0x99530916, 0x7c439e77, 0xff12051e),
#                (0xdd7e0e88, 0x7e2fff68, 0x608fc842, 0xf9dcc154),
#                (0x859f5f23, 0x7a8d5a3d, 0xc0c02952, 0xbeefd63a),
#                (0xde601e78, 0x27bcdf2c, 0xa223800f, 0xd8aeda32),
#                (0xa4970a33, 0x1a78dc09, 0xc418c271, 0xe3a41d5d))
#
#    # 256 bit keys.
#    key256_1 = (0x00000000, 0x00000000, 0x00000000, 0x00000000,
#                0x00000000, 0x00000000, 0x00000000, 0x0000000)
#    exp256_1 = ((0x00000000, 0x00000000, 0x00000000, 0x00000000),
#                (0x00000000, 0x00000000, 0x00000000, 0x00000000),
#                (0x62636363, 0x62636363, 0x62636363, 0x62636363),
#                (0xaafbfbfb, 0xaafbfbfb, 0xaafbfbfb, 0xaafbfbfb),
#                (0x6f6c6ccf, 0x0d0f0fac, 0x6f6c6ccf, 0x0d0f0fac),
#                (0x7d8d8d6a, 0xd7767691, 0x7d8d8d6a, 0xd7767691),
#                (0x5354edc1, 0x5e5be26d, 0x31378ea2, 0x3c38810e),
#                (0x968a81c1, 0x41fcf750, 0x3c717a3a, 0xeb070cab),
#                (0x9eaa8f28, 0xc0f16d45, 0xf1c6e3e7, 0xcdfe62e9),
#                (0x2b312bdf, 0x6acddc8f, 0x56bca6b5, 0xbdbbaa1e),
#                (0x6406fd52, 0xa4f79017, 0x553173f0, 0x98cf1119),
#                (0x6dbba90b, 0x07767584, 0x51cad331, 0xec71792f),
#                (0xe7b0e89c, 0x4347788b, 0x16760b7b, 0x8eb91a62),
#                (0x74ed0ba1, 0x739b7e25, 0x2251ad14, 0xce20d43b),
#                (0x10f80a17, 0x53bf729c, 0x45c979e7, 0xcb706385))
#
#    key256_2 = (0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
#                0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff)
#    exp256_2 = ((0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff),
#                (0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff),
#                (0xe8e9e9e9, 0x17161616, 0xe8e9e9e9, 0x17161616),
#                (0x0fb8b8b8, 0xf0474747, 0x0fb8b8b8, 0xf0474747),
#                (0x4a494965, 0x5d5f5f73, 0xb5b6b69a, 0xa2a0a08c),
#                (0x355858dc, 0xc51f1f9b, 0xcaa7a723, 0x3ae0e064),
#                (0xafa80ae5, 0xf2f75596, 0x4741e30c, 0xe5e14380),
#                (0xeca04211, 0x29bf5d8a, 0xe318faa9, 0xd9f81acd),
#                (0xe60ab7d0, 0x14fde246, 0x53bc014a, 0xb65d42ca),
#                (0xa2ec6e65, 0x8b5333ef, 0x684bc946, 0xb1b3d38b),
#                (0x9b6c8a18, 0x8f91685e, 0xdc2d6914, 0x6a702bde),
#                (0xa0bd9f78, 0x2beeac97, 0x43a565d1, 0xf216b65a),
#                (0xfc223491, 0x73b35ccf, 0xaf9e35db, 0xc5ee1e05),
#                (0x0695ed13, 0x2d7b4184, 0x6ede2455, 0x9cc8920f),
#                (0x546d424f, 0x27de1e80, 0x88402b5b, 0x4dae355e))
#
#    key256_3 = (0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f,
#                0x10111213, 0x14151617, 0x18191a1b, 0x1c1d1e1f)
#    exp256_3 = ((0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f),
#                (0x10111213, 0x14151617, 0x18191a1b, 0x1c1d1e1f),
#                (0xa573c29f, 0xa176c498, 0xa97fce93, 0xa572c09c),
#                (0x1651a8cd, 0x0244beda, 0x1a5da4c1, 0x0640bade),
#                (0xae87dff0, 0x0ff11b68, 0xa68ed5fb, 0x03fc1567),
#                (0x6de1f148, 0x6fa54f92, 0x75f8eb53, 0x73b8518d),
#                (0xc656827f, 0xc9a79917, 0x6f294cec, 0x6cd5598b),
#                (0x3de23a75, 0x524775e7, 0x27bf9eb4, 0x5407cf39),
#                (0x0bdc905f, 0xc27b0948, 0xad5245a4, 0xc1871c2f),
#                (0x45f5a660, 0x17b2d387, 0x300d4d33, 0x640a820a),
#                (0x7ccff71c, 0xbeb4fe54, 0x13e6bbf0, 0xd261a7df),
#                (0xf01afafe, 0xe7a82979, 0xd7a5644a, 0xb3afe640),
#                (0x2541fe71, 0x9bf50025, 0x8813bbd5, 0x5a721c0a),
#                (0x4e5a6699, 0xa9f24fe0, 0x7e572baa, 0xcdf8cdea),
#                (0x24fc79cc, 0xbf0979e9, 0x371ac23c, 0x6d68de36))
#
#    print("*** Test of 128 bit keys: ***")
#    test_key(key128_1, exp128_1)
#    test_key(key128_2, exp128_2)
#    test_key(key128_3, exp128_3)
#    test_key(key128_4, exp128_4)
#    print("")
#
#    print("*** Test of 192 bit keys: ***")
#    test_key(key192_1, exp192_1)
#    test_key(key192_2, exp192_2)
#    test_key(key192_3, exp192_3)
#    print("")
#
#    print("*** Test of 256 bit keys: ***")
#    test_key(key256_1, exp256_1)
#    test_key(key256_2, exp256_2)
#    test_key(key256_3, exp256_3)
#    print("")


#-------------------------------------------------------------------
# main()
#
# If executed tests the ChaCha class using known test vectors.
#-------------------------------------------------------------------
def main():
    print("Testing the AES key generation")
    print("==============================")
    print

    test_key_expansion()


#-------------------------------------------------------------------
# __name__
# Python thingy which allows the file to be run standalone as
# well as parsed from within a Python interpreter.
#-------------------------------------------------------------------
if __name__=="__main__": 
    # Run the main function.
    sys.exit(main())

#=======================================================================
# EOF aes_key_gen.py
#=======================================================================