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[aes] Fix GCM pad length calculation (#11438)

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Closes #10169
Authored by: seproDev
This commit is contained in:
sepro
2024-11-03 21:03:09 +01:00
committed by GitHub
parent 3945677a75
commit beae2db127
2 changed files with 14 additions and 2 deletions
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4
yt_dlp/aes.py
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@@ -230,11 +230,11 @@ def aes_gcm_decrypt_and_verify(data, key, tag, nonce):
iv_ctr = inc(j0)
decrypted_data = aes_ctr_decrypt(data, key, iv_ctr + [0] * (BLOCK_SIZE_BYTES - len(iv_ctr)))
pad_len = len(data) // 16 * 16
pad_len = (BLOCK_SIZE_BYTES - (len(data) % BLOCK_SIZE_BYTES)) % BLOCK_SIZE_BYTES
s_tag = ghash(
hash_subkey,
data
+ [0] * (BLOCK_SIZE_BYTES - len(data) + pad_len) # pad
+ [0] * pad_len # pad
+ bytes_to_intlist((0 * 8).to_bytes(8, 'big') # length of associated data
+ ((len(data) * 8).to_bytes(8, 'big'))), # length of data
)