import sys
import numpy as np
import pandas as pd
import codecs
import copy
import os
import argparse

Nb = 4
Nk = 4
Nr = 10

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,
)

InvSbox = (
    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 = (
    0x00, 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,
)


def SubBytes(state_array):
    for r in range(0, 4):
        for c in range(0, Nb):
            state_array.at[r,c] = Sbox[state_array.at[r,c]]

def InvSubBytes(state_array):
    for r in range(0, 4):
        for c in range(0, Nb):
            state_array.at[r,c] = InvSbox[state_array.at[r,c]]

def ShiftRows(state_array):
    state_array.at[1,0], state_array.at[1,1], state_array.at[1,2], state_array.at[1,3] = \
    state_array.at[1,1], state_array.at[1,2], state_array.at[1,3], state_array.at[1,0]

    state_array.at[2,0], state_array.at[2,1], state_array.at[2,2], state_array.at[2,3] = \
    state_array.at[2,2], state_array.at[2,3], state_array.at[2,0], state_array.at[2,1]

    state_array.at[3,0], state_array.at[3,1], state_array.at[3,2], state_array.at[3,3] = \
    state_array.at[3,3], state_array.at[3,0], state_array.at[3,1], state_array.at[3,2]

def InvShiftRows(state_array):
    state_array.at[1,0], state_array.at[1,1], state_array.at[1,2], state_array.at[1,3] = \
    state_array.at[1,3], state_array.at[1,0], state_array.at[1,1], state_array.at[1,2]

    state_array.at[2,0], state_array.at[2,1], state_array.at[2,2], state_array.at[2,3] = \
    state_array.at[2,2], state_array.at[2,3], state_array.at[2,0], state_array.at[2,1]

    state_array.at[3,0], state_array.at[3,1], state_array.at[3,2], state_array.at[3,3] = \
    state_array.at[3,1], state_array.at[3,2], state_array.at[3,3], state_array.at[3,0]


xtime = lambda a: (((a << 1) ^ 0x1B) & 0xFF) if (a & 0x80) else (a << 1)

def mix_single_column(a):
    t = a[0] ^ a[1] ^ a[2] ^ a[3]
    u = a[0]
    a[0] ^= t ^ xtime(a[0] ^ a[1])
    a[1] ^= t ^ xtime(a[1] ^ a[2])
    a[2] ^= t ^ xtime(a[2] ^ a[3])
    a[3] ^= t ^ xtime(a[3] ^ u)


def MixColumns(s):
    for i in range(4):
        mix_single_column(s[i])

def InvMixColumns(s):
    for i in range(4):
        u = xtime(xtime(s[i][0] ^ s[i][2]))
        v = xtime(xtime(s[i][1] ^ s[i][3]))
        s[i][0] ^= u
        s[i][1] ^= v
        s[i][2] ^= u
        s[i][3] ^= v
    MixColumns(s)



def RotWord(w):
    temp_in = w.copy()
    temp_out = w.copy()
    temp_out[0] = temp_in[1]
    temp_out[1] = temp_in[2]
    temp_out[2] = temp_in[3]
    temp_out[3] = temp_in[0]
    return temp_out


def SubWord(sw):
    sw_l = sw.copy()
    sw_l[0] = Sbox[sw[0]]
    sw_l[1] = Sbox[sw[1]]
    sw_l[2] = Sbox[sw[2]]
    sw_l[3] = Sbox[sw[3]]
    return sw_l

def AddRoundKey(state, words, round):
    for c in range(0, Nb):
        state[c] ^= words[round*Nb + c]

def LE_inc_bytes(a):
    """ Returns a new byte array with the value increment by 1 """
    out = list(a)
    for i in range(len(out)):
        if out[i] == 0xFF:
            out[i] = 0
        else:
            out[i] += 1
            break
    return bytes(out)

class AES:
    def __init__(self, master_key):
        key_words_array = np.zeros(4*Nb*(Nr+1)).reshape(4, Nb*(Nr+1)).astype("int")
        for r in range(0,4):
            for c in range(0, Nb):
                key_words_array[r,c] = master_key[r + 4*c]

        rcon_words_array = np.zeros(4*24).reshape(4, 24).astype("int")
        for c in range(0, 24):
            rcon_words_array[0,c] = Rcon[c]
        self.rwords_array = pd.DataFrame(data = rcon_words_array)

        self.kwords_array = pd.DataFrame(data = key_words_array)
        self.KeyExpansion(self.kwords_array, Nk)

    def KeyExpansion(self, words, Nk):
        i = Nk
        while (i < Nb*(Nr+1)):
            temp = words[i-1].copy()
            if (0 == (i % Nk)):
                temp = SubWord(RotWord(temp)) ^ self.rwords_array[i // Nk]
            words[i] = words[i-Nk] ^ temp
            #print_w("word_i :", words[i])
            i = i+1

    def Cipher(self, state, words):
        AddRoundKey(state, words, 0)
        for round_i in range(1, Nr):
            SubBytes(state)
            ShiftRows(state)
            MixColumns(state)
            AddRoundKey(state, words, round_i)
        SubBytes(state)
        ShiftRows(state)
        AddRoundKey(state, words, Nr)

    def InvCipher(self, state, words):
        AddRoundKey(state, words, Nr)
        for round_i in range(Nr-1, 0, -1):
            InvShiftRows(state)
            InvSubBytes(state)
            AddRoundKey(state, words, round_i)
            InvMixColumns(state)
        InvShiftRows(state)
        InvSubBytes(state)
        AddRoundKey(state, words, 0)

    def encrypt_ecb(self, pt_in_buf):
        kwords_array = self.kwords_array
        input_bytes = np.arange(16).reshape(4,4)
        output_txt_buf = []
        for blk_i in range(0, len(pt_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = pt_in_buf[16*blk_i + (r + 4*c)]

            state_array = pd.DataFrame(data = input_bytes)
            self.Cipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r]]))
        return output_txt_buf

    def decrypt_ecb(self, ct_in_buf):
        kwords_array = self.kwords_array
        input_bytes = np.arange(16).reshape(4,4)
        output_txt_buf = []
        for blk_i in range(0, len(ct_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = ct_in_buf[16*blk_i + (r + 4*c)]

            state_array = pd.DataFrame(data = input_bytes)
            self.InvCipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r]]))
        return output_txt_buf

    def encrypt_cbc(self, pt_in_buf, IV):
        kwords_array = self.kwords_array
        prev_ct = np.zeros(4*Nb).astype(int)
        output_txt_buf = []
        input_bytes = np.arange(16).reshape(4,4)
        for i in range(0, 4*Nb):
            prev_ct[i] = IV[i]
        for blk_i in range(0, len(pt_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = pt_in_buf[16*blk_i + (r + 4*c)] ^ prev_ct[r+4*c]

            state_array = pd.DataFrame(data = input_bytes)
            self.Cipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r]]))
                    prev_ct[r+4*c] = temp[r].copy()
        return output_txt_buf

    def decrypt_cbc(self, ct_in_buf, IV):
        kwords_array = self.kwords_array
        prev_ct = np.zeros(4*Nb).astype(int)
        input_bytes = np.arange(16).reshape(4,4)
        output_txt_buf = []
        for i in range(0, 4*Nb):
            prev_ct[i] = IV[i]
        for blk_i in range(0, len(ct_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = ct_in_buf[16*blk_i + (r + 4*c)]

            state_array = pd.DataFrame(data = input_bytes)
            self.InvCipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r] ^ prev_ct[r+4*c]]))
                    prev_ct[r+4*c] = ct_in_buf[16*blk_i + (r + 4*c)]
        return output_txt_buf

    def encrypt_ctr(self, pt_in_buf, nonce):
        kwords_array = self.kwords_array
        input_bytes = np.arange(16).reshape(4,4)
        output_txt_buf = []
        print(len(pt_in_buf))
        for blk_i in range(0, len(pt_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = nonce[(r + 4*c)]
            state_array = pd.DataFrame(data = input_bytes)
            self.Cipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r] ^ pt_in_buf[16*blk_i + (r + 4*c)]]))
            nonce[8:16] = LE_inc_bytes(nonce[8:16])
        return output_txt_buf

    def decrypt_ctr(self, ct_in_buf, nonce):
        kwords_array = self.kwords_array
        input_bytes = np.arange(16).reshape(4,4)
        output_txt_buf = []
        print(len(ct_in_buf))
        for blk_i in range(0, len(ct_in_buf) // 16):
            for r in range(0, 4):
                for c in range(0, Nb):
                    input_bytes[r,c] = nonce[(r + 4*c)]
            state_array = pd.DataFrame(data = input_bytes)
            self.Cipher(state_array, kwords_array)
            for c in range(0, Nb):
                temp = state_array[c]
                for r in range(0, 4):
                    output_txt_buf.append(bytes([temp[r] ^ ct_in_buf[16*blk_i + (r + 4*c)]]))
            nonce[8:16] = LE_inc_bytes(nonce[8:16])
            print(nonce)
        return output_txt_buf

def padding_pkcs7(pt_in_buf):
    padded_pt_in_buf = []
    for i in range(0, len(pt_in_buf)):
        padded_pt_in_buf.append(pt_in_buf[i])

    padding_cnt = 16 - (len(padded_pt_in_buf) % 16)
    for i in range(0, padding_cnt):
        padded_pt_in_buf.append(padding_cnt)
    return padded_pt_in_buf

def validate_pkcs7(inp_buffer):
    #print(len(inp_buffer))
    pad_char = inp_buffer[-1]
    if 0 == int.from_bytes(pad_char, "big"):
        return False
    #print("pad char: ", int.from_bytes(pad_char, "big"))
    for i in range(0, int.from_bytes(pad_char, "big")):
        #print("in valid ", i, pad_char, inp_buffer[-1-i])
        if (pad_char != inp_buffer[-1-i]):
            return False
    return True
"""
End of functions
"""
