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@ -24,8 +24,8 @@ def aes_ctr_decrypt(data, key, counter):
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decrypted_data = []
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decrypted_data = []
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for i in range(block_count):
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for i in range(block_count):
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counter_block = counter.next_value()
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counter_block = counter.next_value()
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block = data[i *BLOCK_SIZE_BYTES: (i +1) *BLOCK_SIZE_BYTES]
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block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
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block += [0] *(BLOCK_SIZE_BYTES - len(block))
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block += [0] * (BLOCK_SIZE_BYTES - len(block))
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cipher_counter_block = aes_encrypt(counter_block, expanded_key)
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cipher_counter_block = aes_encrypt(counter_block, expanded_key)
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decrypted_data += xor(block, cipher_counter_block)
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decrypted_data += xor(block, cipher_counter_block)
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@ -49,8 +49,8 @@ def aes_cbc_decrypt(data, key, iv):
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decrypted_data = []
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decrypted_data = []
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previous_cipher_block = iv
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previous_cipher_block = iv
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for i in range(block_count):
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for i in range(block_count):
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block = data[i *BLOCK_SIZE_BYTES: (i +1) *BLOCK_SIZE_BYTES]
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block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
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block += [0] *(BLOCK_SIZE_BYTES - len(block))
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block += [0] * (BLOCK_SIZE_BYTES - len(block))
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decrypted_block = aes_decrypt(block, expanded_key)
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decrypted_block = aes_decrypt(block, expanded_key)
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decrypted_data += xor(decrypted_block, previous_cipher_block)
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decrypted_data += xor(decrypted_block, previous_cipher_block)
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@ -76,20 +76,20 @@ def key_expansion(data):
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temp = data[-4:]
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temp = data[-4:]
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temp = key_schedule_core(temp, rcon_iteration)
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temp = key_schedule_core(temp, rcon_iteration)
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rcon_iteration += 1
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rcon_iteration += 1
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data += xor(temp, data[-key_size_bytes: 4 -key_size_bytes])
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data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
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for _ in range(3):
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for _ in range(3):
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temp = data[-4:]
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temp = data[-4:]
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data += xor(temp, data[-key_size_bytes: 4 -key_size_bytes])
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data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
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if key_size_bytes == 32:
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if key_size_bytes == 32:
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temp = data[-4:]
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temp = data[-4:]
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temp = sub_bytes(temp)
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temp = sub_bytes(temp)
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data += xor(temp, data[-key_size_bytes: 4 -key_size_bytes])
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data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
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for _ in range(3 if key_size_bytes == 32 else 2 if key_size_bytes == 24 else 0):
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for _ in range(3 if key_size_bytes == 32 else 2 if key_size_bytes == 24 else 0):
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temp = data[-4:]
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temp = data[-4:]
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data += xor(temp, data[-key_size_bytes: 4 -key_size_bytes])
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data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
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data = data[:expanded_key_size_bytes]
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data = data[:expanded_key_size_bytes]
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return data
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return data
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@ -106,12 +106,12 @@ def aes_encrypt(data, expanded_key):
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rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
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rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
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data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
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data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
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for i in range(1, rounds +1):
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for i in range(1, rounds + 1):
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data = sub_bytes(data)
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data = sub_bytes(data)
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data = shift_rows(data)
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data = shift_rows(data)
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if i != rounds:
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if i != rounds:
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data = mix_columns(data)
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data = mix_columns(data)
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data = xor(data, expanded_key[i *BLOCK_SIZE_BYTES: (i +1) *BLOCK_SIZE_BYTES])
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data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
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return data
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return data
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@ -127,7 +127,7 @@ def aes_decrypt(data, expanded_key):
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rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
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rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
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for i in range(rounds, 0, -1):
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for i in range(rounds, 0, -1):
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data = xor(data, expanded_key[i *BLOCK_SIZE_BYTES: (i +1) *BLOCK_SIZE_BYTES])
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data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
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if i != rounds:
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if i != rounds:
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data = mix_columns_inv(data)
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data = mix_columns_inv(data)
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data = shift_rows_inv(data)
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data = shift_rows_inv(data)
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@ -155,14 +155,14 @@ def aes_decrypt_text(data, password, key_size_bytes):
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data = bytes_to_intlist(base64.b64decode(data))
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data = bytes_to_intlist(base64.b64decode(data))
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password = bytes_to_intlist(password.encode('utf-8'))
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password = bytes_to_intlist(password.encode('utf-8'))
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key = password[:key_size_bytes] + [0] *(key_size_bytes - len(password))
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key = password[:key_size_bytes] + [0] * (key_size_bytes - len(password))
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key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES)
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key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES)
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nonce = data[:NONCE_LENGTH_BYTES]
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nonce = data[:NONCE_LENGTH_BYTES]
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cipher = data[NONCE_LENGTH_BYTES:]
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cipher = data[NONCE_LENGTH_BYTES:]
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class Counter:
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class Counter:
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__value = nonce + [0] *(BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)
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__value = nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)
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def next_value(self):
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def next_value(self):
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temp = self.__value
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temp = self.__value
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@ -270,7 +270,7 @@ def key_schedule_core(data, rcon_iteration):
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def xor(data1, data2):
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def xor(data1, data2):
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return [x^y for x, y in zip(data1, data2)]
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return [x ^ y for x, y in zip(data1, data2)]
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def rijndael_mul(a, b):
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def rijndael_mul(a, b):
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@ -293,7 +293,7 @@ def mix_column(data, matrix):
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def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
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def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
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data_mixed = []
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data_mixed = []
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for i in range(4):
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for i in range(4):
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column = data[i *4: (i +1) *4]
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column = data[i * 4: (i + 1) * 4]
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data_mixed += mix_column(column, matrix)
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data_mixed += mix_column(column, matrix)
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return data_mixed
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return data_mixed
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@ -320,7 +320,7 @@ def shift_rows_inv(data):
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def inc(data):
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def inc(data):
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data = data[:] # copy
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data = data[:] # copy
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for i in range(len(data) -1, -1, -1):
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for i in range(len(data) - 1, -1, -1):
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if data[i] == 255:
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if data[i] == 255:
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data[i] = 0
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data[i] = 0
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else:
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else:
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