mirror of
https://github.com/yt-dlp/yt-dlp.git
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0f06bcd759
* [youtube] Fix `--youtube-skip-dash-manifest` * [build] Use `$()` in `Makefile`. Closes #3684 * Fix bug in385ffb467b* Fix bug in43d7f5a5d0* [cleanup] Remove unnecessary `utf-8` from `str.encode`/`bytes.decode` * [utils] LazyList: Expose unnecessarily "protected" attributes and other minor cleanup
513 lines
21 KiB
Python
513 lines
21 KiB
Python
from math import ceil
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from .compat import compat_b64decode, compat_ord
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from .dependencies import Cryptodome_AES
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from .utils import bytes_to_intlist, intlist_to_bytes
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if Cryptodome_AES:
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def aes_cbc_decrypt_bytes(data, key, iv):
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""" Decrypt bytes with AES-CBC using pycryptodome """
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return Cryptodome_AES.new(key, Cryptodome_AES.MODE_CBC, iv).decrypt(data)
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def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce):
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""" Decrypt bytes with AES-GCM using pycryptodome """
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return Cryptodome_AES.new(key, Cryptodome_AES.MODE_GCM, nonce).decrypt_and_verify(data, tag)
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else:
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def aes_cbc_decrypt_bytes(data, key, iv):
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""" Decrypt bytes with AES-CBC using native implementation since pycryptodome is unavailable """
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return intlist_to_bytes(aes_cbc_decrypt(*map(bytes_to_intlist, (data, key, iv))))
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def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce):
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""" Decrypt bytes with AES-GCM using native implementation since pycryptodome is unavailable """
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return intlist_to_bytes(aes_gcm_decrypt_and_verify(*map(bytes_to_intlist, (data, key, tag, nonce))))
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def unpad_pkcs7(data):
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return data[:-compat_ord(data[-1])]
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BLOCK_SIZE_BYTES = 16
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def aes_ecb_encrypt(data, key, iv=None):
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"""
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Encrypt with aes in ECB mode
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@param {int[]} data cleartext
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv Unused for this mode
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@returns {int[]} encrypted data
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"""
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expanded_key = key_expansion(key)
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block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
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encrypted_data = []
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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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encrypted_data += aes_encrypt(block, expanded_key)
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encrypted_data = encrypted_data[:len(data)]
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return encrypted_data
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def aes_ecb_decrypt(data, key, iv=None):
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"""
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Decrypt with aes in ECB mode
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@param {int[]} data cleartext
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv Unused for this mode
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@returns {int[]} decrypted data
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"""
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expanded_key = key_expansion(key)
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block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
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encrypted_data = []
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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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encrypted_data += aes_decrypt(block, expanded_key)
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encrypted_data = encrypted_data[:len(data)]
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return encrypted_data
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def aes_ctr_decrypt(data, key, iv):
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"""
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Decrypt with aes in counter mode
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@param {int[]} data cipher
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv 16-Byte initialization vector
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@returns {int[]} decrypted data
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"""
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return aes_ctr_encrypt(data, key, iv)
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def aes_ctr_encrypt(data, key, iv):
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"""
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Encrypt with aes in counter mode
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@param {int[]} data cleartext
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv 16-Byte initialization vector
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@returns {int[]} encrypted data
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"""
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expanded_key = key_expansion(key)
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block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
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counter = iter_vector(iv)
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encrypted_data = []
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for i in range(block_count):
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counter_block = next(counter)
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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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cipher_counter_block = aes_encrypt(counter_block, expanded_key)
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encrypted_data += xor(block, cipher_counter_block)
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encrypted_data = encrypted_data[:len(data)]
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return encrypted_data
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def aes_cbc_decrypt(data, key, iv):
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"""
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Decrypt with aes in CBC mode
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@param {int[]} data cipher
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv 16-Byte IV
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@returns {int[]} decrypted data
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"""
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expanded_key = key_expansion(key)
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block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
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decrypted_data = []
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previous_cipher_block = iv
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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 += [0] * (BLOCK_SIZE_BYTES - len(block))
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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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previous_cipher_block = block
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decrypted_data = decrypted_data[:len(data)]
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return decrypted_data
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def aes_cbc_encrypt(data, key, iv):
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"""
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Encrypt with aes in CBC mode. Using PKCS#7 padding
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@param {int[]} data cleartext
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@param {int[]} key 16/24/32-Byte cipher key
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@param {int[]} iv 16-Byte IV
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@returns {int[]} encrypted data
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"""
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expanded_key = key_expansion(key)
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block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
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encrypted_data = []
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previous_cipher_block = iv
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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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remaining_length = BLOCK_SIZE_BYTES - len(block)
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block += [remaining_length] * remaining_length
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mixed_block = xor(block, previous_cipher_block)
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encrypted_block = aes_encrypt(mixed_block, expanded_key)
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encrypted_data += encrypted_block
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previous_cipher_block = encrypted_block
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return encrypted_data
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def aes_gcm_decrypt_and_verify(data, key, tag, nonce):
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"""
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Decrypt with aes in GBM mode and checks authenticity using tag
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@param {int[]} data cipher
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@param {int[]} key 16-Byte cipher key
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@param {int[]} tag authentication tag
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@param {int[]} nonce IV (recommended 12-Byte)
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@returns {int[]} decrypted data
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"""
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# XXX: check aes, gcm param
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hash_subkey = aes_encrypt([0] * BLOCK_SIZE_BYTES, key_expansion(key))
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if len(nonce) == 12:
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j0 = nonce + [0, 0, 0, 1]
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else:
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fill = (BLOCK_SIZE_BYTES - (len(nonce) % BLOCK_SIZE_BYTES)) % BLOCK_SIZE_BYTES + 8
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ghash_in = nonce + [0] * fill + bytes_to_intlist((8 * len(nonce)).to_bytes(8, 'big'))
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j0 = ghash(hash_subkey, ghash_in)
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# TODO: add nonce support to aes_ctr_decrypt
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# nonce_ctr = j0[:12]
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iv_ctr = inc(j0)
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decrypted_data = aes_ctr_decrypt(data, key, iv_ctr + [0] * (BLOCK_SIZE_BYTES - len(iv_ctr)))
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pad_len = len(data) // 16 * 16
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s_tag = ghash(
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hash_subkey,
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data
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+ [0] * (BLOCK_SIZE_BYTES - len(data) + pad_len) # pad
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+ bytes_to_intlist((0 * 8).to_bytes(8, 'big') # length of associated data
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+ ((len(data) * 8).to_bytes(8, 'big'))) # length of data
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)
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if tag != aes_ctr_encrypt(s_tag, key, j0):
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raise ValueError("Mismatching authentication tag")
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return decrypted_data
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def aes_encrypt(data, expanded_key):
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"""
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Encrypt one block with aes
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@param {int[]} data 16-Byte state
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@param {int[]} expanded_key 176/208/240-Byte expanded key
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@returns {int[]} 16-Byte cipher
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"""
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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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for i in range(1, rounds + 1):
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data = sub_bytes(data)
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data = shift_rows(data)
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if i != rounds:
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data = list(iter_mix_columns(data, MIX_COLUMN_MATRIX))
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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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def aes_decrypt(data, expanded_key):
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"""
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Decrypt one block with aes
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@param {int[]} data 16-Byte cipher
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@param {int[]} expanded_key 176/208/240-Byte expanded key
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@returns {int[]} 16-Byte state
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"""
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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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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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data = list(iter_mix_columns(data, MIX_COLUMN_MATRIX_INV))
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data = shift_rows_inv(data)
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data = sub_bytes_inv(data)
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data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
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return data
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def aes_decrypt_text(data, password, key_size_bytes):
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"""
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Decrypt text
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- The first 8 Bytes of decoded 'data' are the 8 high Bytes of the counter
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- The cipher key is retrieved by encrypting the first 16 Byte of 'password'
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with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's)
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- Mode of operation is 'counter'
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@param {str} data Base64 encoded string
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@param {str,unicode} password Password (will be encoded with utf-8)
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@param {int} key_size_bytes Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit
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@returns {str} Decrypted data
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"""
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NONCE_LENGTH_BYTES = 8
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data = bytes_to_intlist(compat_b64decode(data))
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password = bytes_to_intlist(password.encode())
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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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nonce = data[:NONCE_LENGTH_BYTES]
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cipher = data[NONCE_LENGTH_BYTES:]
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decrypted_data = aes_ctr_decrypt(cipher, key, nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES))
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plaintext = intlist_to_bytes(decrypted_data)
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return plaintext
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RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
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SBOX = (0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
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0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
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0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
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0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
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0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
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0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
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0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
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0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
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0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
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0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
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0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
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0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
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0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
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0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
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0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
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0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16)
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SBOX_INV = (0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d)
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MIX_COLUMN_MATRIX = ((0x2, 0x3, 0x1, 0x1),
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(0x1, 0x2, 0x3, 0x1),
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(0x1, 0x1, 0x2, 0x3),
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(0x3, 0x1, 0x1, 0x2))
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MIX_COLUMN_MATRIX_INV = ((0xE, 0xB, 0xD, 0x9),
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(0x9, 0xE, 0xB, 0xD),
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(0xD, 0x9, 0xE, 0xB),
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(0xB, 0xD, 0x9, 0xE))
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RIJNDAEL_EXP_TABLE = (0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35,
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0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA,
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0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31,
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0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC, 0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD,
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0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7, 0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88,
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0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F, 0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A,
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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 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])
|
|
|
|
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 = data[:expanded_key_size_bytes]
|
|
|
|
return data
|
|
|
|
|
|
def iter_vector(iv):
|
|
while True:
|
|
yield iv
|
|
iv = inc(iv)
|
|
|
|
|
|
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 iter_mix_columns(data, matrix):
|
|
for i in (0, 4, 8, 12):
|
|
for row in matrix:
|
|
mixed = 0
|
|
for j in range(4):
|
|
# xor is (+) and (-)
|
|
mixed ^= (0 if data[i:i + 4][j] == 0 or row[j] == 0 else
|
|
RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[data[i + j]] + RIJNDAEL_LOG_TABLE[row[j]]) % 0xFF])
|
|
yield mixed
|
|
|
|
|
|
def shift_rows(data):
|
|
return [data[((column + row) & 0b11) * 4 + row] for column in range(4) for row in range(4)]
|
|
|
|
|
|
def shift_rows_inv(data):
|
|
return [data[((column - row) & 0b11) * 4 + row] for column in range(4) for row in range(4)]
|
|
|
|
|
|
def shift_block(data):
|
|
data_shifted = []
|
|
|
|
bit = 0
|
|
for n in data:
|
|
if bit:
|
|
n |= 0x100
|
|
bit = n & 1
|
|
n >>= 1
|
|
data_shifted.append(n)
|
|
|
|
return data_shifted
|
|
|
|
|
|
def inc(data):
|
|
data = data[:] # copy
|
|
for i in range(len(data) - 1, -1, -1):
|
|
if data[i] == 255:
|
|
data[i] = 0
|
|
else:
|
|
data[i] = data[i] + 1
|
|
break
|
|
return data
|
|
|
|
|
|
def block_product(block_x, block_y):
|
|
# NIST SP 800-38D, Algorithm 1
|
|
|
|
if len(block_x) != BLOCK_SIZE_BYTES or len(block_y) != BLOCK_SIZE_BYTES:
|
|
raise ValueError("Length of blocks need to be %d bytes" % BLOCK_SIZE_BYTES)
|
|
|
|
block_r = [0xE1] + [0] * (BLOCK_SIZE_BYTES - 1)
|
|
block_v = block_y[:]
|
|
block_z = [0] * BLOCK_SIZE_BYTES
|
|
|
|
for i in block_x:
|
|
for bit in range(7, -1, -1):
|
|
if i & (1 << bit):
|
|
block_z = xor(block_z, block_v)
|
|
|
|
do_xor = block_v[-1] & 1
|
|
block_v = shift_block(block_v)
|
|
if do_xor:
|
|
block_v = xor(block_v, block_r)
|
|
|
|
return block_z
|
|
|
|
|
|
def ghash(subkey, data):
|
|
# NIST SP 800-38D, Algorithm 2
|
|
|
|
if len(data) % BLOCK_SIZE_BYTES:
|
|
raise ValueError("Length of data should be %d bytes" % BLOCK_SIZE_BYTES)
|
|
|
|
last_y = [0] * BLOCK_SIZE_BYTES
|
|
for i in range(0, len(data), BLOCK_SIZE_BYTES):
|
|
block = data[i: i + BLOCK_SIZE_BYTES]
|
|
last_y = block_product(xor(last_y, block), subkey)
|
|
|
|
return last_y
|
|
|
|
|
|
__all__ = [
|
|
'aes_ctr_decrypt',
|
|
'aes_cbc_decrypt',
|
|
'aes_cbc_decrypt_bytes',
|
|
'aes_decrypt_text',
|
|
'aes_encrypt',
|
|
'aes_gcm_decrypt_and_verify',
|
|
'aes_gcm_decrypt_and_verify_bytes',
|
|
'key_expansion',
|
|
'unpad_pkcs7',
|
|
]
|