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https://github.com/yt-dlp/yt-dlp.git
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parent
f4c68ba372
commit
c9619f0a17
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@ -8,7 +8,7 @@
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import unittest
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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from youtube_dl.aes import aes_decrypt, aes_encrypt, aes_cbc_decrypt, aes_decrypt_text
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from youtube_dl.aes import aes_decrypt, aes_encrypt, aes_cbc_decrypt, aes_cbc_encrypt, aes_decrypt_text
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from youtube_dl.utils import bytes_to_intlist, intlist_to_bytes
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import base64
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@ -34,6 +34,13 @@ def test_cbc_decrypt(self):
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decrypted = intlist_to_bytes(aes_cbc_decrypt(data, self.key, self.iv))
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self.assertEqual(decrypted.rstrip(b'\x08'), self.secret_msg)
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def test_cbc_encrypt(self):
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data = bytes_to_intlist(self.secret_msg)
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encrypted = intlist_to_bytes(aes_cbc_encrypt(data, self.key, self.iv))
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self.assertEqual(
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encrypted,
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b"\x97\x92+\xe5\x0b\xc3\x18\x91ky9m&\xb3\xb5@\xe6'\xc2\x96.\xc8u\x88\xab9-[\x9e|\xf1\xcd")
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def test_decrypt_text(self):
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password = intlist_to_bytes(self.key).decode('utf-8')
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encrypted = base64.b64encode(
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@ -60,6 +60,34 @@ def aes_cbc_decrypt(data, key, iv):
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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 key_expansion(data):
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"""
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Generate key schedule
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