path: root/gallery_dl/aes.py

# -*- coding: utf-8 -*-

# This is a stripped down version of youtube-dl's aes module.
# All credit for this code goes to the authors of the youtube-dl project.
# https://ytdl-org.github.io/youtube-dl/
# https://github.com/ytdl-org/youtube-dl/

import base64
from math import ceil

BLOCK_SIZE_BYTES = 16


def aes_cbc_decrypt(data, key, iv):
    """
    Decrypt with aes in CBC mode

    @param {int[]} data        cipher
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          16-Byte IV
    @returns {int[]}           decrypted data
    """
    expanded_key = key_expansion(key)
    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))

    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))

        decrypted_block = aes_decrypt(block, expanded_key)
        decrypted_data += xor(decrypted_block, previous_cipher_block)
        previous_cipher_block = block
    decrypted_data = decrypted_data[:len(data)]

    return decrypted_data


def aes_cbc_decrypt_text(data, key, iv):
    """
    Decrypt with aes in CBC mode

    @param {string} data       base64 encoded cipher
    @param {int[]}  key        16/24/32-Byte cipher key
    @param {int[]}  iv         16-Byte IV
    @returns {string}          decrypted data as utf8 encoded string
    """
    data = base64.standard_b64decode(bytes(data, "ascii"))
    charcodes = aes_cbc_decrypt(list(data), key, iv)
    last = charcodes[-1]
    if last <= 16:
        charcodes = charcodes[:-last]
    return bytes(charcodes).decode()


def key_expansion(data):
    """
    Generate key schedule

    @param {int[]} data  16/24/32-Byte cipher key
    @returns {int[]}     176/208/240-Byte expanded key
    """
    data = data[:]  # copy
    rcon_iteration = 1
    key_size_bytes = len(data)
    expanded_key_size_bytes = (key_size_bytes // 4 + 7) * BLOCK_SIZE_BYTES

    while len(data) < expanded_key_size_bytes:
        temp = data[-4:]
        temp = key_schedule_core(temp, rcon_iteration)
        rcon_iteration += 1
        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])

        if key_size_bytes == 32:
            temp = data[-4:]
            temp = sub_bytes(temp)
            data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])

        if key_size_bytes == 32:
            rounds = 3
        elif key_size_bytes == 24:
            rounds = 2
        else:
            rounds = 0
        for _ in range(rounds):
            temp = data[-4:]
            data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
    data = data[:expanded_key_size_bytes]

    return data


def aes_decrypt(data, expanded_key):
    """
    Decrypt one block with aes

    @param {int[]} data          16-Byte cipher
    @param {int[]} expanded_key  176/208/240-Byte expanded key
    @returns {int[]}             16-Byte state
    """
    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]
        )
        if i != rounds:
            data = mix_columns_inv(data)
        data = shift_rows_inv(data)
        data = sub_bytes_inv(data)
    data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])

    return data


RCON = (
    0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
)
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,
)
SBOX_INV = (
    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,
)
MIX_COLUMN_MATRIX = (
    (0x2, 0x3, 0x1, 0x1),
    (0x1, 0x2, 0x3, 0x1),
    (0x1, 0x1, 0x2, 0x3),
    (0x3, 0x1, 0x1, 0x2),
)
MIX_COLUMN_MATRIX_INV = (
    (0xE, 0xB, 0xD, 0x9),
    (0x9, 0xE, 0xB, 0xD),
    (0xD, 0x9, 0xE, 0xB),
    (0xB, 0xD, 0x9, 0xE),
)
RIJNDAEL_EXP_TABLE = (
    0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF,
    0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35,
    0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4,
    0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA,
    0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26,
    0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31,
    0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC,
    0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD,
    0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7,
    0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88,
    0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F,
    0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A,
    0xB5, 0xC4, 0x57, 0xF9, 0x10, 0x30, 0x50, 0xF0,
    0x0B, 0x1D, 0x27, 0x69, 0xBB, 0xD6, 0x61, 0xA3,
    0xFE, 0x19, 0x2B, 0x7D, 0x87, 0x92, 0xAD, 0xEC,
    0x2F, 0x71, 0x93, 0xAE, 0xE9, 0x20, 0x60, 0xA0,
    0xFB, 0x16, 0x3A, 0x4E, 0xD2, 0x6D, 0xB7, 0xC2,
    0x5D, 0xE7, 0x32, 0x56, 0xFA, 0x15, 0x3F, 0x41,
    0xC3, 0x5E, 0xE2, 0x3D, 0x47, 0xC9, 0x40, 0xC0,
    0x5B, 0xED, 0x2C, 0x74, 0x9C, 0xBF, 0xDA, 0x75,
    0x9F, 0xBA, 0xD5, 0x64, 0xAC, 0xEF, 0x2A, 0x7E,
    0x82, 0x9D, 0xBC, 0xDF, 0x7A, 0x8E, 0x89, 0x80,
    0x9B, 0xB6, 0xC1, 0x58, 0xE8, 0x23, 0x65, 0xAF,
    0xEA, 0x25, 0x6F, 0xB1, 0xC8, 0x43, 0xC5, 0x54,
    0xFC, 0x1F, 0x21, 0x63, 0xA5, 0xF4, 0x07, 0x09,
    0x1B, 0x2D, 0x77, 0x99, 0xB0, 0xCB, 0x46, 0xCA,
    0x45, 0xCF, 0x4A, 0xDE, 0x79, 0x8B, 0x86, 0x91,
    0xA8, 0xE3, 0x3E, 0x42, 0xC6, 0x51, 0xF3, 0x0E,
    0x12, 0x36, 0x5A, 0xEE, 0x29, 0x7B, 0x8D, 0x8C,
    0x8F, 0x8A, 0x85, 0x94, 0xA7, 0xF2, 0x0D, 0x17,
    0x39, 0x4B, 0xDD, 0x7C, 0x84, 0x97, 0xA2, 0xFD,
    0x1C, 0x24, 0x6C, 0xB4, 0xC7, 0x52, 0xF6, 0x01,
)
RIJNDAEL_LOG_TABLE = (
    0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6,
    0x4b, 0xc7, 0x1b, 0x68, 0x33, 0xee, 0xdf, 0x03,
    0x64, 0x04, 0xe0, 0x0e, 0x34, 0x8d, 0x81, 0xef,
    0x4c, 0x71, 0x08, 0xc8, 0xf8, 0x69, 0x1c, 0xc1,
    0x7d, 0xc2, 0x1d, 0xb5, 0xf9, 0xb9, 0x27, 0x6a,
    0x4d, 0xe4, 0xa6, 0x72, 0x9a, 0xc9, 0x09, 0x78,
    0x65, 0x2f, 0x8a, 0x05, 0x21, 0x0f, 0xe1, 0x24,
    0x12, 0xf0, 0x82, 0x45, 0x35, 0x93, 0xda, 0x8e,
    0x96, 0x8f, 0xdb, 0xbd, 0x36, 0xd0, 0xce, 0x94,
    0x13, 0x5c, 0xd2, 0xf1, 0x40, 0x46, 0x83, 0x38,
    0x66, 0xdd, 0xfd, 0x30, 0xbf, 0x06, 0x8b, 0x62,
    0xb3, 0x25, 0xe2, 0x98, 0x22, 0x88, 0x91, 0x10,
    0x7e, 0x6e, 0x48, 0xc3, 0xa3, 0xb6, 0x1e, 0x42,
    0x3a, 0x6b, 0x28, 0x54, 0xfa, 0x85, 0x3d, 0xba,
    0x2b, 0x79, 0x0a, 0x15, 0x9b, 0x9f, 0x5e, 0xca,
    0x4e, 0xd4, 0xac, 0xe5, 0xf3, 0x73, 0xa7, 0x57,
    0xaf, 0x58, 0xa8, 0x50, 0xf4, 0xea, 0xd6, 0x74,
    0x4f, 0xae, 0xe9, 0xd5, 0xe7, 0xe6, 0xad, 0xe8,
    0x2c, 0xd7, 0x75, 0x7a, 0xeb, 0x16, 0x0b, 0xf5,
    0x59, 0xcb, 0x5f, 0xb0, 0x9c, 0xa9, 0x51, 0xa0,
    0x7f, 0x0c, 0xf6, 0x6f, 0x17, 0xc4, 0x49, 0xec,
    0xd8, 0x43, 0x1f, 0x2d, 0xa4, 0x76, 0x7b, 0xb7,
    0xcc, 0xbb, 0x3e, 0x5a, 0xfb, 0x60, 0xb1, 0x86,
    0x3b, 0x52, 0xa1, 0x6c, 0xaa, 0x55, 0x29, 0x9d,
    0x97, 0xb2, 0x87, 0x90, 0x61, 0xbe, 0xdc, 0xfc,
    0xbc, 0x95, 0xcf, 0xcd, 0x37, 0x3f, 0x5b, 0xd1,
    0x53, 0x39, 0x84, 0x3c, 0x41, 0xa2, 0x6d, 0x47,
    0x14, 0x2a, 0x9e, 0x5d, 0x56, 0xf2, 0xd3, 0xab,
    0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89,
    0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5,
    0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18,
    0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07,
)


def sub_bytes(data):
    return [SBOX[x] for x in data]


def sub_bytes_inv(data):
    return [SBOX_INV[x] for x in data]


def rotate(data):
    return data[1:] + [data[0]]


def key_schedule_core(data, rcon_iteration):
    data = rotate(data)
    data = sub_bytes(data)
    data[0] = data[0] ^ RCON[rcon_iteration]
    return data


def xor(data1, data2):
    return [x ^ y for x, y in zip(data1, data2)]


def rijndael_mul(a, b):
    if a == 0 or b == 0:
        return 0
    return RIJNDAEL_EXP_TABLE[
        (RIJNDAEL_LOG_TABLE[a] + RIJNDAEL_LOG_TABLE[b]) % 0xFF
    ]


def mix_column(data, matrix):
    data_mixed = []
    for row in range(4):
        mixed = 0
        for column in range(4):
            # xor is (+) and (-)
            mixed ^= rijndael_mul(data[column], matrix[row][column])
        data_mixed.append(mixed)
    return data_mixed


def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
    data_mixed = []
    for i in range(4):
        column = data[i * 4: (i + 1) * 4]
        data_mixed += mix_column(column, matrix)
    return data_mixed


def mix_columns_inv(data):
    return mix_columns(data, MIX_COLUMN_MATRIX_INV)


def shift_rows_inv(data):
    data_shifted = []
    for column in range(4):
        for row in range(4):
            data_shifted.append(data[((column - row) & 0b11) * 4 + row])
    return data_shifted


__all__ = ['key_expansion', 'aes_cbc_decrypt', 'aes_cbc_decrypt_text']