# Initial permutation matrix used
init_permut = [58, 50, 42, 34, 26, 18, 10, 2,
               60, 52, 44, 36, 28, 20, 12, 4,
               62, 54, 46, 38, 30, 22, 14, 6,
               64, 56, 48, 40, 32, 24, 16, 8,
               57, 49, 41, 33, 25, 17, 9, 1,
               59, 51, 43, 35, 27, 19, 11, 3,
               61, 53, 45, 37, 29, 21, 13, 5,
               63, 55, 47, 39, 31, 23, 15, 7]
# Final permutation used
final_premut_inverse = [40, 8, 48, 16, 56, 24, 64, 32,
                        39, 7, 47, 15, 55, 23, 63, 31,
                        38, 6, 46, 14, 54, 22, 62, 30,
                        37, 5, 45, 13, 53, 21, 61, 29,
                        36, 4, 44, 12, 52, 20, 60, 28,
                        35, 3, 43, 11, 51, 19, 59, 27,
                        34, 2, 42, 10, 50, 18, 58, 26,
                        33, 1, 41, 9, 49, 17, 57, 25]

# Expansion permutaion
expan_permut = [32, 1, 2, 3, 4, 5,
                4, 5, 6, 7, 8, 9,
                8, 9, 10, 11, 12, 13,
                12, 13, 14, 15, 16, 17,
                16, 17, 18, 19, 20, 21,
                20, 21, 22, 23, 24, 25,
                24, 25, 26, 27, 28, 29,
                28, 29, 30, 31, 32, 1]

# S-box used for S-box calculations
s_box = [
    # Box-1
    [
        [14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
        [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
        [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
        [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]
    ],
    # Box-2
    [
        [15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
        [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
        [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
        [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]
    ],
    # Box-3
    [
        [10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
        [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
        [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
        [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]
    ],
    # Box-4
    [
        [7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
        [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
        [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
        [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]
    ],
    # Box-5
    [
        [2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
        [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
        [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
        [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]
    ],
    # Box-6
    [
        [12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
        [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
        [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
        [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]
    ],
    # Box-7
    [
        [4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
        [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
        [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
        [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]
    ],
    # Box-8
    [
        [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
        [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
        [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
        [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]
    ]
]


# The parity drop portion of the program
def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ""
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    # Python list index start with 0
    # so index -1 will cover the difference between the index
    return keys_56bits


PC1 = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43,
    35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54,
    46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4]

keys_64bits = "0001001100110100010101110111100" \
              "110011011101111001101111111110001 "
keys_56bits = apply_PC1(PC1, keys_64bits)


# Output: 11110000110011001010101011110101010101100110011110001111

# Splitting the key in half
def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


left56, right56 = split_in_half(keys_56bits)


# Circular Left shift
def circular_left_shift(bits, numberofbits):
    """This method will circularly shift the given bit string according
    to the number of bits"""
    shiftedbits = bits[numberofbits:] + bits[:numberofbits]
    return shiftedbits


circularShiftedBits = circular_left_shift(bits, numberofbits)


# Compression P Box
def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ""
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


PC2 = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7,
       27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49,
       39, 56, 34, 53, 46, 42, 50, 36, 29, 32]
subkey = apply_compression(PC2, left_half + right_half)

# Subkey Generation and Round
def generate_keys(key_64bits):
    round_keys = list()
    pc1_out = apply_PC1(PC1,keys_64bits)
    L0,R0 = split_in_half(pc1_out)
    for roundnumber in range(16):
        newL = circular_left_shift(L0, round_shifts[roundnumber])
        newR = circular_left_shift(R0, round_shifts[roundnumber])
        round_key = apply_PC2(PC2,newL+newR)
        round_keys.append(roundkey)
        L0 = newL
        R0 = newR
    return round_keys

round_shifts = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
key_64bits = "0001001100110100010101110111100110011011101111001101111111110001"
subkeys = generate_keys(key_64bits)
# The subkeys will have all 16 keys as Python list
print(subkeys)
a8474f75c3d2d742fa1c16c41157080839e90f4c
<mask token>


def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ''
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    return keys_56bits


<mask token>


def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


<mask token>


def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ''
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


<mask token>

<mask token>


def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ''
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    return keys_56bits


<mask token>


def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


<mask token>


def circular_left_shift(bits, numberofbits):
    """This method will circularly shift the given bit string according
    to the number of bits"""
    shiftedbits = bits[numberofbits:] + bits[:numberofbits]
    return shiftedbits


<mask token>


def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ''
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


<mask token>


def generate_keys(key_64bits):
    round_keys = list()
    pc1_out = apply_PC1(PC1, keys_64bits)
    L0, R0 = split_in_half(pc1_out)
    for roundnumber in range(16):
        newL = circular_left_shift(L0, round_shifts[roundnumber])
        newR = circular_left_shift(R0, round_shifts[roundnumber])
        round_key = apply_PC2(PC2, newL + newR)
        round_keys.append(roundkey)
        L0 = newL
        R0 = newR
    return round_keys


<mask token>

<mask token>


def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ''
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    return keys_56bits


<mask token>


def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


<mask token>


def circular_left_shift(bits, numberofbits):
    """This method will circularly shift the given bit string according
    to the number of bits"""
    shiftedbits = bits[numberofbits:] + bits[:numberofbits]
    return shiftedbits


<mask token>


def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ''
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


<mask token>


def generate_keys(key_64bits):
    round_keys = list()
    pc1_out = apply_PC1(PC1, keys_64bits)
    L0, R0 = split_in_half(pc1_out)
    for roundnumber in range(16):
        newL = circular_left_shift(L0, round_shifts[roundnumber])
        newR = circular_left_shift(R0, round_shifts[roundnumber])
        round_key = apply_PC2(PC2, newL + newR)
        round_keys.append(roundkey)
        L0 = newL
        R0 = newR
    return round_keys


<mask token>
print(subkeys)

init_permut = [58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
    62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 
    41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29,
    21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7]
final_premut_inverse = [40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 
    23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 
    29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2,
    42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25]
expan_permut = [32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 
    12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,
    24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1]
s_box = [[[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7], [0, 15, 7,
    4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8], [4, 1, 14, 8, 13, 6, 2, 11,
    15, 12, 9, 7, 3, 10, 5, 0], [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10,
    0, 6, 13]], [[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10], [3,
    13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5], [0, 14, 7, 11, 10, 
    4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15], [13, 8, 10, 1, 3, 15, 4, 2, 11, 6,
    7, 12, 0, 5, 14, 9]], [[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4,
    2, 8], [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1], [13, 6, 
    4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7], [1, 10, 13, 0, 6, 9, 8,
    7, 4, 15, 14, 3, 11, 5, 2, 12]], [[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 
    5, 11, 12, 4, 15], [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 
    9], [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4], [3, 15, 0, 
    6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]], [[2, 12, 4, 1, 7, 10, 11,
    6, 8, 5, 3, 15, 13, 0, 14, 9], [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 
    10, 3, 9, 8, 6], [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
    [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]], [[12, 1, 10, 
    15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11], [10, 15, 4, 2, 7, 12, 9, 5,
    6, 1, 13, 14, 0, 11, 3, 8], [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1,
    13, 11, 6], [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]], [[
    4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1], [13, 0, 11, 7, 4,
    9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6], [1, 4, 11, 13, 12, 3, 7, 14, 10, 
    15, 6, 8, 0, 5, 9, 2], [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 
    3, 12]], [[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7], [1, 
    15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2], [7, 11, 4, 1, 9, 12,
    14, 2, 0, 6, 10, 13, 15, 3, 5, 8], [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 
    9, 0, 3, 5, 6, 11]]]


def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ''
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    return keys_56bits


PC1 = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51,
    43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 
    62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
    ]
keys_64bits = (
    '0001001100110100010101110111100110011011101111001101111111110001 ')
keys_56bits = apply_PC1(PC1, keys_64bits)


def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


left56, right56 = split_in_half(keys_56bits)


def circular_left_shift(bits, numberofbits):
    """This method will circularly shift the given bit string according
    to the number of bits"""
    shiftedbits = bits[numberofbits:] + bits[:numberofbits]
    return shiftedbits


circularShiftedBits = circular_left_shift(bits, numberofbits)


def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ''
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


PC2 = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16,
    7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 
    49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32]
subkey = apply_compression(PC2, left_half + right_half)


def generate_keys(key_64bits):
    round_keys = list()
    pc1_out = apply_PC1(PC1, keys_64bits)
    L0, R0 = split_in_half(pc1_out)
    for roundnumber in range(16):
        newL = circular_left_shift(L0, round_shifts[roundnumber])
        newR = circular_left_shift(R0, round_shifts[roundnumber])
        round_key = apply_PC2(PC2, newL + newR)
        round_keys.append(roundkey)
        L0 = newL
        R0 = newR
    return round_keys


round_shifts = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
key_64bits = '0001001100110100010101110111100110011011101111001101111111110001'
subkeys = generate_keys(key_64bits)
print(subkeys)

# Initial permutation matrix used
init_permut = [58, 50, 42, 34, 26, 18, 10, 2,
               60, 52, 44, 36, 28, 20, 12, 4,
               62, 54, 46, 38, 30, 22, 14, 6,
               64, 56, 48, 40, 32, 24, 16, 8,
               57, 49, 41, 33, 25, 17, 9, 1,
               59, 51, 43, 35, 27, 19, 11, 3,
               61, 53, 45, 37, 29, 21, 13, 5,
               63, 55, 47, 39, 31, 23, 15, 7]
# Final permutation used
final_premut_inverse = [40, 8, 48, 16, 56, 24, 64, 32,
                        39, 7, 47, 15, 55, 23, 63, 31,
                        38, 6, 46, 14, 54, 22, 62, 30,
                        37, 5, 45, 13, 53, 21, 61, 29,
                        36, 4, 44, 12, 52, 20, 60, 28,
                        35, 3, 43, 11, 51, 19, 59, 27,
                        34, 2, 42, 10, 50, 18, 58, 26,
                        33, 1, 41, 9, 49, 17, 57, 25]

# Expansion permutaion
expan_permut = [32, 1, 2, 3, 4, 5,
                4, 5, 6, 7, 8, 9,
                8, 9, 10, 11, 12, 13,
                12, 13, 14, 15, 16, 17,
                16, 17, 18, 19, 20, 21,
                20, 21, 22, 23, 24, 25,
                24, 25, 26, 27, 28, 29,
                28, 29, 30, 31, 32, 1]

# S-box used for S-box calculations
s_box = [
    # Box-1
    [
        [14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
        [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
        [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
        [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]
    ],
    # Box-2
    [
        [15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
        [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
        [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
        [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]
    ],
    # Box-3
    [
        [10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
        [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
        [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
        [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]
    ],
    # Box-4
    [
        [7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
        [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
        [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
        [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]
    ],
    # Box-5
    [
        [2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
        [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
        [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
        [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]
    ],
    # Box-6
    [
        [12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
        [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
        [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
        [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]
    ],
    # Box-7
    [
        [4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
        [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
        [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
        [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]
    ],
    # Box-8
    [
        [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
        [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
        [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
        [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]
    ]
]


# The parity drop portion of the program
def apply_PC1(pc1_table, keys_64bits):
    """ This function takes Permutation table and initial key as
 input and return 56 bits key as output"""
    keys_56bits = ""
    for index in pc1_table:
        keys_56bits += keys_64bits[index - 1]
    # Python list index start with 0
    # so index -1 will cover the difference between the index
    return keys_56bits


PC1 = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43,
    35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54,
    46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4]

keys_64bits = "0001001100110100010101110111100" \
              "110011011101111001101111111110001 "
keys_56bits = apply_PC1(PC1, keys_64bits)


# Output: 11110000110011001010101011110101010101100110011110001111

# Splitting the key in half
def split_in_half(keys_56bits):
    """ Split the 56 bits key into two equal half """
    left_keys, right_keys = keys_56bits[:28], keys_56bits[28:]
    return left_keys, right_keys


left56, right56 = split_in_half(keys_56bits)


# Circular Left shift
def circular_left_shift(bits, numberofbits):
    """This method will circularly shift the given bit string according
    to the number of bits"""
    shiftedbits = bits[numberofbits:] + bits[:numberofbits]
    return shiftedbits


circularShiftedBits = circular_left_shift(bits, numberofbits)


# Compression P Box
def apply_compression(pc2_table, keys_56bits):
    """ This will take Compression table and combined both half
     as input and return a 48-bits string as output"""
    keys_48bits = ""
    for index in pc2_table:
        keys_48bits += keys_56bits[index - 1]
    return keys_48bits


PC2 = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7,
       27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49,
       39, 56, 34, 53, 46, 42, 50, 36, 29, 32]
subkey = apply_compression(PC2, left_half + right_half)

# Subkey Generation and Round
def generate_keys(key_64bits):
    round_keys = list()
    pc1_out = apply_PC1(PC1,keys_64bits)
    L0,R0 = split_in_half(pc1_out)
    for roundnumber in range(16):
        newL = circular_left_shift(L0, round_shifts[roundnumber])
        newR = circular_left_shift(R0, round_shifts[roundnumber])
        round_key = apply_PC2(PC2,newL+newR)
        round_keys.append(roundkey)
        L0 = newL
        R0 = newR
    return round_keys

round_shifts = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
key_64bits = "0001001100110100010101110111100110011011101111001101111111110001"
subkeys = generate_keys(key_64bits)
# The subkeys will have all 16 keys as Python list
print(subkeys)