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