aes_lib.py

#!/usr/bin/env python
import binascii, struct
from cryptopals_lib import *

class AES():
	#Constants

	#Generated by 
	'''
	round_constants = "\x00"
	for x in range(10):
		if round_constants[x] >= "\x80":
			round_constants[x+1] = round_constants[x] *2
		else:
			round_constants[x+1] = fixed_xor((round_constants[x] *2), '\x1b')

	'''
	round_constants = bytearray([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])

	#Initial state of the Sbox (256 bytes) From definition
	sbox = bytearray([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])

	inverted_sbox = bytearray([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])

	def __init__(self, key, cipher="ECB"):
		#self.key = key
		self.cipher_name = cipher

		#Get Keysize for AES 128/192/256
		self.keysize = len(key)
		#print("Keysize: {}".format(self.keysize))

		#Block Size is static for AES
		self.block_size = 16
		self._setup_keysize_info()

		#Static blocksize of 4x4
		#Doesn't depend on the key
		self.state = [bytes(4) for i in range(4)]

		self.rounds_keys = self._key_expantion(key)
		#self._printkey_expantion(self.rounds_keys)

	def _setup_keysize_info(self):
		if self.keysize == 16:
			self.rounds = 10
			self.words = 4
			self.key_expantion_size = self.keysize * 11
		elif self.keysize == 24:
			self.rounds = 12
			self.words = 6
			self.key_expantion_size = self.keysize * 11
		elif self.keysize == 32:
			self.rounds = 14
			self.words = 8
			self.key_expantion_size = self.keysize * (self.rounds +1)
		else:
			raise ValueError("Invalid key size %d".format(self.keysize))

	def _printkey_expantion(self, keys):
		row_size = len(keys) // 4
		for x in range(4):
			print(' '.join('{:02X}'.format(a) for a in keys[(x*row_size):((x+1)*row_size)-1]))

	def _key_expantion(self, key, row_idx=4):
		row_size = self.key_expantion_size // row_idx
		tmp_array = bytearray([0x00 for i in range(row_idx)])
		round_keys = bytearray(self.key_expantion_size)

		#Setup first key
		for idx in range(row_idx):
			round_keys[(idx*row_size):(idx*row_size)+ self.words] = [key[(row_idx*x) + idx] for x in range(self.words)]
			#self._printkey_expantion(round_keys)
			#print("")

		#self._printkey_expantion(round_keys)
		#Setup rest of the keys
		for column_num in range(self.words, row_size):
			#Reset round_xor per column
			round_xor = bytearray([0x00 for i in range(row_idx)])
			
			#Set up temp array for Key Round expansion
			for idx in range(row_idx):
				tmp_array[idx] = round_keys[(row_size*idx )+ column_num -1]
			#print('Temp: ' + ' '.join('{:02X}'.format(a) for a in tmp_array))
			
			#First round of the Next key
			if column_num % self.words == 0:
				#Rotate Word
				#Take last column and shift top to bottom
				tmp_array = tmp_array[1:] + tmp_array[:1] 
				#print('After Rotate Word: ' + ' '.join('{:02X}'.format(a) for a in tmp_array))

				#Sub Bytes
				#Take the index from the sbox 
				tmp_array = [self.sbox[tmp_array[idx]] for idx in range(row_idx)]
				#print('After Sub Bytes: ' + ' '.join('{:02X}'.format(a) for a in tmp_array))

				#Set Round_xor
				round_xor[0] = self.round_constants[(column_num//self.words)]
				#print('Rcon: ' + ' '.join('{:02X}'.format(a) for a in round_xor))

			#Specific case for 256 bit key
			elif self.keysize == 32 and column_num % self.words == 4:
				#Sub Bytes
				#Take the index from the sbox 
				tmp_array = [self.sbox[tmp_array[idx]] for idx in range(row_idx)]
				#print('After Sub Bytes: ' + ' '.join('{:02X}'.format(a) for a in tmp_array))

			#Xor the rmp_array and the round_xor
			for idx in range(row_idx):
				tmp_array[idx] ^= round_xor[idx]
			#print('After Rcon: ' + ' '.join('{:02X}'.format(a) for a in tmp_array))

			#XOR the tmp_array and the column_num-3
			for idx in range(row_idx):
				round_keys[(row_size*idx )+ column_num] = (tmp_array[idx] ^ round_keys[(row_size*idx )+ column_num -self.words])
				#print("{:02X} ^ {:02X}".format(tmp_array[idx], round_keys[(row_size*idx )+ column_num -self.words]))
			#self._printkey_expantion(round_keys)

		return round_keys

	def _sub_bytes(self, input_bytes):
		output_bytes = bytearray()

		#Use the input_bytes as an index to lookup what to substitute from the sbox index.
		for lookup in input_bytes:
			output_bytes.append(self.sbox[lookup])

		return output_bytes


	def _shift_rows(self, input_byte_array, idx=4):
		#No swap for row 1
		input_byte_array[0:idx] = input_byte_array[0:idx]

		#Rotate once for row 2
		input_byte_array[idx:(idx*2)] = input_byte_array[idx+1:(idx*2)] + input_byte_array[idx:idx+1]

		#Rotate twice for row 3
		input_byte_array[(idx*2):(idx*3)] = input_byte_array[(idx*2)+2:(idx*3)] + input_byte_array[(idx*2):(idx*2)+2]

		#Rotate thrice for row 4
		#print(input_byte_array[(idx*3)+3:(idx*4)] + input_byte_array[(idx*3):(idx*4)-1])
		input_byte_array[(idx*3):(idx*4)] = input_byte_array[(idx*3)+3:(idx*4)] + input_byte_array[(idx*3):(idx*4)-1]

		return input_byte_array

	def _mix_columns(self, input_num):
		matrix_mult_row = [2,3,1,1]
		mix_output = bytearray(16)

		#First
		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[0] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[1] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[2] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[3] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)

		#Rotate the matrix_mult_row
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[4] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[5] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[6] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[7] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)
			

		#Rotate the matrix_mult_row
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[8] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[9] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[10] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[11] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)


		#Rotate the matrix_mult_row
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[12] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[13] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[14] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[15] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)

		return mix_output

	def _gmult(self, input_num, mult_parm):
		#for the reverse parts
		if mult_parm == 0x09:
			#Change from 9 to 2x2x2+1
			return self._gmult(self._gmult(self._gmult(input_num, 2), 2), 2) ^ input_num
		elif mult_parm == 0x0b:
			#Change from 11 to (2x2+1)x2+1
			return (self._gmult((self._gmult(self._gmult(input_num, 2), 2) ^ input_num), 2) ^ input_num)
		elif mult_parm == 0x0d:
			#Change from 13 to (2+1)x2x2+1
			return (self._gmult(self._gmult((self._gmult(input_num, 2) ^ input_num), 2), 2) ^ input_num)
		elif mult_parm == 0x0e:
			#Change from 15 to ((2+1)x2+1)x2
			return self._gmult((self._gmult((self._gmult(input_num, 2) ^ input_num), 2) ^ input_num), 2)

		output_num = 0
		if mult_parm & 1 == 1:
			#mult_parm is a 1 or a 3
			output_num = input_num

		if mult_parm & 2 == 2:
			#mult_parm is a 2
			if input_num & 0x80:
				#If high bit is set
				output_num ^= (input_num << 1) ^ 0x1b
			else:
				#if high bit it not set
				output_num ^= (input_num << 1)
		return output_num & 0xFF

	def _add_round_key(self, input_bytes, round_index, row_idx=4):
		row_size = self.key_expantion_size // row_idx

		#Make Round Key
		round_key =  self.rounds_keys[(0*row_size)+(row_idx*round_index):(0*row_size)+(row_idx*round_index)+row_idx]
		round_key += self.rounds_keys[(1*row_size)+(row_idx*round_index):(1*row_size)+(row_idx*round_index)+row_idx]
		round_key += self.rounds_keys[(2*row_size)+(row_idx*round_index):(2*row_size)+(row_idx*round_index)+row_idx]
		round_key += self.rounds_keys[(3*row_size)+(row_idx*round_index):(3*row_size)+(row_idx*round_index)+row_idx]
		#print("k_sch[{}]: {}".format(round_index, round_key))

		#Xor the input bytes with the previous round key
		for idx in range(len(input_bytes)):
			input_bytes[idx] ^= round_key[idx]

		return input_bytes


	def _reverse_shift_rows(self, input_byte_array, idx=4):
		#No swap for row 1
		input_byte_array[0:idx] = input_byte_array[0:idx]

		#Rotate back once for row 2
		input_byte_array[idx:(idx*2)] = input_byte_array[(idx*2)-1:(idx*2)] + input_byte_array[idx:(idx*2)-1] 

		#Rotate back twice for row 3
		input_byte_array[(idx*2):(idx*3)] = input_byte_array[(idx*2)+2:(idx*3)] + input_byte_array[(idx*2):(idx*2)+2]

		#Rotate back thrice for row 4
		input_byte_array[(idx*3):(idx*4)] = input_byte_array[(idx*3)+1:(idx*4)] + input_byte_array[(idx*3):(idx*3)+1]

		return input_byte_array

	def _reverse_sub_bytes(self, input_bytes):
		output_bytes = bytearray()

		#Use the input_bytes as an index to lookup what to substitute from the inverted_sbox index.
		for lookup in input_bytes:
			output_bytes.append(self.inverted_sbox[lookup])

		return output_bytes

	def _reverse_mix_columns(self, input_num):
		matrix_mult_row = [14,11,13,9]
		mix_output = bytearray(16)

		#First
		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[0] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[1] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[2] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[3] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)

		#Rotate the matrix_mult_row
		#print(matrix_mult_row)
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]
		#print(matrix_mult_row)

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[4] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[5] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[6] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[7] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)
			

		#Rotate the matrix_mult_row
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[8] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[9] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[10] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[11] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)


		#Rotate the matrix_mult_row
		matrix_mult_row = matrix_mult_row[-1:] + matrix_mult_row[:-1]

		for x in range(4):
			#print("Index: {}".format((x*4)+(i%4)))
			mix_output[12] ^= self._gmult(input_num[(x*4)], matrix_mult_row[x])
			mix_output[13] ^= self._gmult(input_num[(x*4)+1], matrix_mult_row[x])
			mix_output[14] ^= self._gmult(input_num[(x*4)+2], matrix_mult_row[x])
			mix_output[15] ^= self._gmult(input_num[(x*4)+3], matrix_mult_row[x])
		#print(mix_output)

		return mix_output

	def aes_block_encryption(self, plaintext):
		if len(plaintext) != 16:
			raise ValueError('wrong block length')

		#Fix mapping
		#print("plaintxt: {}".format(binascii.hexlify(plaintext)))
		plaintext = bytearray([ plaintext[0],plaintext[4],plaintext[8],plaintext[12],
								plaintext[1],plaintext[5],plaintext[9],plaintext[13],
								plaintext[2],plaintext[6],plaintext[10],plaintext[14],
								plaintext[3],plaintext[7],plaintext[11],plaintext[15]])

		temp = self._add_round_key(plaintext, 0)
		#print("After Add Rounds: {}, length: {}".format(temp, len(temp)))

		#Do the first 9 rounds
		for x in range(1, self.rounds):
			#Do Sub Bytes
			temp = self._sub_bytes(temp)
			#print("s_box[{}]: {}".format(x, binascii.hexlify(temp)))

			#Do ShiftRows
			temp = self._shift_rows(temp)
			#print("s_row[{}]: {}".format(x, binascii.hexlify(temp)))

			#Do Mix Columns
			temp = self._mix_columns(temp)
			#print("m_col[{}]: {}".format(x, binascii.hexlify(temp)))

			#Do Round Key
			temp = self._add_round_key(temp, x)
			#print("k_sch[{}]: {}".format(x, binascii.hexlify(temp)))

		#Do last round
		#Do Sub Bytes
		temp = self._sub_bytes(temp)
		#print("s_box[{}]: {}".format(self.rounds, binascii.hexlify(temp)))
		#Do ShiftRows
		temp = self._shift_rows(temp)
		#print("s_row[{}]: {}".format(self.rounds, binascii.hexlify(temp)))
		#Do Round Key
		temp = self._add_round_key(temp, self.rounds)

		#unbox to output
		#print("result: {}".format(binascii.hexlify(temp)))
		temp = bytearray([ temp[0],temp[4],temp[8],temp[12],
						   temp[1],temp[5],temp[9],temp[13],
						   temp[2],temp[6],temp[10],temp[14],
						   temp[3],temp[7],temp[11],temp[15]])
		#print("result: {}".format(binascii.hexlify(temp)))

		return temp

	def aes_block_decryption(self, ciphertext):
		if len(ciphertext) != 16:
			raise ValueError('wrong block length')

		#Fix mapping
		ciphertext = bytearray([ciphertext[0],ciphertext[4],ciphertext[8],ciphertext[12],
								ciphertext[1],ciphertext[5],ciphertext[9],ciphertext[13],
								ciphertext[2],ciphertext[6],ciphertext[10],ciphertext[14],
								ciphertext[3],ciphertext[7],ciphertext[11],ciphertext[15]])
		#print("plaintxt: {}".format(binascii.hexlify(ciphertext)))

		temp = self._add_round_key(ciphertext, self.rounds)
		#print("After Add Rounds: {}, length: {}".format(temp, len(temp)))

		#Do the reverse_add_round_key 9-0
		for x in range(self.rounds-1,0,-1):
			#Do ShiftRows
			temp = self._reverse_shift_rows(temp)
			#print("s_row[{}]: {}".format(self.rounds-x, binascii.hexlify(temp)))
			#Do Sub Bytes
			temp = self._reverse_sub_bytes(temp)
			#print("s_box[{}]: {}".format(self.rounds-x, binascii.hexlify(temp)))
			#Do Round Key
			temp = self._add_round_key(temp, x)
			#print("k_sch[{}]: {}".format(self.rounds-x, binascii.hexlify(temp)))
			#Do Mix Columns
			temp = self._reverse_mix_columns(temp)
			#print("m_col[{}]: {}".format(self.rounds-x, binascii.hexlify(temp)))


			#print("After Add Rounds: {}, length: {}".format(temp, len(temp)))

		#Do last round
		#Do ShiftRows
		temp = self._reverse_shift_rows(temp)
		#print("s_row[{}]: {}".format(self.rounds, binascii.hexlify(temp)))
		#Do ShiftRows
		temp = self._reverse_sub_bytes(temp)
		#print("s_box[{}]: {}".format(self.rounds, binascii.hexlify(temp)))
		#Do Round Key
		temp = self._add_round_key(temp, 0)

		#unbox to output
		temp = bytearray([ temp[0],temp[4],temp[8],temp[12],
						   temp[1],temp[5],temp[9],temp[13],
						   temp[2],temp[6],temp[10],temp[14],
						   temp[3],temp[7],temp[11],temp[15]])
		#print("result: {}".format(binascii.hexlify(temp)))

		return temp


	#Add Different Cipher Modes

	def ctr_decryption(self, nonce, plaintext, little_endian=True):
		return self.ctr_encryption(nonce, plaintext, little_endian)


	def ctr_encryption(self, nonce, plaintext, little_endian=True):
		counter = 0
		cipher_blocks = []

		for plain_block in to_blocks(plaintext, self.block_size):
			if len(nonce) == self.block_size:
				counter_nonce = fixedlen_xor(nonce, int_to_bytes_length(counter, self.block_size, False))
			else:
				counter_nonce = nonce + int_to_bytes_length(counter, (self.block_size - len(nonce)), False)
			#print(counter_nonce)
			aes_block = self.aes_block_encryption(counter_nonce)
			#print(aes_block)
			cipher_blocks.append(shortest_xor(aes_block, plain_block))
			
			counter += 1

		#Merge Cipher Blocks
		return combind_blocks(cipher_blocks)

	def ofb_encryption(self, init_iv, plaintext):
		plain_blocks = to_blocks(plaintext, self.block_size)
		previous_block = init_iv
		cipher_blocks = []

		for plain_block in plain_blocks:
			aes_block = self.aes_block_encryption(previous_block)
			cipher_blocks.append(fixedlen_xor(aes_block, plain_block))

			previous_block = aes_block

		#Merge Cipher Blocks
		return combind_blocks(cipher_blocks)

	def ofb_decryption(self, ciphertext):
		#First Block is the IV
		cipher_blocks = to_blocks(ciphertext, self.block_size)
		previous_block = cipher_blocks[0]
		plain_blocks = []

		for cipher_block in cipher_blocks[1:]:
			aes_block = self.aes_block_encryption(previous_block)
			plain_blocks.append(fixedlen_xor(aes_block, cipher_block))

			previous_block = aes_block

		#Merge Cipher Blocks
		return combind_blocks(plain_blocks)

	def cfb_encryption(self, init_iv, plaintext):
		#First Block is the IV
		plain_blocks = to_blocks(plaintext, self.block_size)
		cipher_blocks = [init_iv]

		for plain_block in plain_blocks:
			aes_block = self.aes_block_encryption(cipher_blocks[-1])
			cipher_blocks.append(fixedlen_xor(aes_block, plain_block))

		#Merge Cipher Blocks
		return combind_blocks(cipher_blocks[1:])

	def cfb_decryption(self, ciphertext):
		#First Block is the IV
		cipher_blocks = to_blocks(ciphertext, self.block_size)
		previous_block = cipher_blocks[0]
		plain_blocks = []

		for cipher_block in cipher_blocks[1:]:
			aes_block = self.aes_block_encryption(previous_block)
			plain_blocks.append(fixedlen_xor(aes_block, cipher_block))

			previous_block = cipher_block

		#Merge Cipher Blocks
		return combind_blocks(plain_blocks)

	def cbc_encryption(self, init_iv, plaintext):
		#First Block is the IV
		plain_blocks = to_blocks(plaintext, self.block_size)
		cipher_blocks = [init_iv]

		for plain_block in plain_blocks:
			xor_block = fixedlen_xor(plain_block, cipher_blocks[-1])
			cipher_blocks.append(self.aes_block_encryption(xor_block))

		#Merge Cipher Blocks
		return combind_blocks(cipher_blocks)


	def cbc_decryption(self, ciphertext):
		#First Block is the IV
		cipher_blocks = to_blocks(ciphertext, self.block_size)
		plain_blocks = []

		for index in range(len(cipher_blocks)-1):
			#print(cipher_block, len(cipher_block))
			xor_block = self.aes_block_decryption(cipher_blocks[index+1])
			#print("XOR: ", xor_block, "Last Block: ", cipher_blocks[index])
			plain_blocks.append(fixedlen_xor(xor_block, cipher_blocks[index]))

		#Merge plain_blocks but remove the first one that contains the IV
		#print(plain_blocks)
		return combind_blocks(plain_blocks)

	def ecb_encryption(self, plaintext):
		cipher_blocks = []

		for plain_block in to_blocks(plaintext, self.block_size):
			cipher_blocks.append(self.aes_block_encryption(plain_block))

		return combind_blocks(cipher_blocks)

	def ecb_decryption(self, ciphertext):
		plain_blocks = []

		for cipher_block in to_blocks(ciphertext, self.block_size):
			plain_blocks.append(self.aes_block_decryption(cipher_block))

		return combind_blocks(plain_blocks)

if __name__ == '__main__':
	#AES 128 Key Test
	plaintext = [0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff]
	key =       [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f]
	key2 =      [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17]
	key2a =     [0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b]
	key3 =      [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f]
	key3a =      [0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4]

	test = AES(key3)

	
	#print(plaintext)
	#mid = test._shift_rows(plaintext)
	#print(mid)
	#mid = test._reverse_shift_rows(mid)
	#print(mid)

	#print(plaintext)
	#mid = test._sub_bytes(plaintext)
	#print(mid)
	#mid = test._reverse_sub_bytes(mid)
	#print(mid)

	#print(plaintext)
	#mid = test._mix_columns(plaintext)
	#print(mid)
	#mid = test._reverse_mix_columns(mid)
	#print(mid)

	print(plaintext)
	cypher = test.aes_block_encryption(plaintext)

	print(binascii.hexlify(cypher))

	plaintext2 = test.aes_block_decryption(cypher)

	print(binascii.hexlify(plaintext2))