Merging upstream version 2024.07.01.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 12 insertions, 24 deletions

diff --git a/yt_dlp/aes.py b/yt_dlp/aes.py
index b3a383c..abf54a9 100644
--- a/yt_dlp/aes.py
+++ b/yt_dlp/aes.py
@@ -68,7 +68,7 @@ def pad_block(block, padding_mode):
         raise NotImplementedError(f'Padding mode {padding_mode} is not implemented')
 
     if padding_mode == 'iso7816' and padding_size:
-        block = block + [0x80]  # NB: += mutates list
+        block = [*block, 0x80]  # NB: += mutates list
         padding_size -= 1
 
     return block + [PADDING_BYTE[padding_mode]] * padding_size
@@ -110,9 +110,7 @@ def aes_ecb_decrypt(data, key, iv=None):
     for i in range(block_count):
         block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
         encrypted_data += aes_decrypt(block, expanded_key)
-    encrypted_data = encrypted_data[:len(data)]
-
-    return encrypted_data
+    return encrypted_data[:len(data)]
 
 
 def aes_ctr_decrypt(data, key, iv):
@@ -148,9 +146,7 @@ def aes_ctr_encrypt(data, key, iv):
 
         cipher_counter_block = aes_encrypt(counter_block, expanded_key)
         encrypted_data += xor(block, cipher_counter_block)
-    encrypted_data = encrypted_data[:len(data)]
-
-    return encrypted_data
+    return encrypted_data[:len(data)]
 
 
 def aes_cbc_decrypt(data, key, iv):
@@ -174,9 +170,7 @@ def aes_cbc_decrypt(data, key, iv):
         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
+    return decrypted_data[:len(data)]
 
 
 def aes_cbc_encrypt(data, key, iv, *, padding_mode='pkcs7'):
@@ -224,7 +218,7 @@ def aes_gcm_decrypt_and_verify(data, key, tag, nonce):
     hash_subkey = aes_encrypt([0] * BLOCK_SIZE_BYTES, key_expansion(key))
 
     if len(nonce) == 12:
-        j0 = nonce + [0, 0, 0, 1]
+        j0 = [*nonce, 0, 0, 0, 1]
     else:
         fill = (BLOCK_SIZE_BYTES - (len(nonce) % BLOCK_SIZE_BYTES)) % BLOCK_SIZE_BYTES + 8
         ghash_in = nonce + [0] * fill + bytes_to_intlist((8 * len(nonce)).to_bytes(8, 'big'))
@@ -242,11 +236,11 @@ def aes_gcm_decrypt_and_verify(data, key, tag, nonce):
         data
         + [0] * (BLOCK_SIZE_BYTES - len(data) + 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
+                           + ((len(data) * 8).to_bytes(8, 'big'))),  # length of data
     )
 
     if tag != aes_ctr_encrypt(s_tag, key, j0):
-        raise ValueError("Mismatching authentication tag")
+        raise ValueError('Mismatching authentication tag')
 
     return decrypted_data
 
@@ -288,9 +282,7 @@ def aes_decrypt(data, expanded_key):
             data = list(iter_mix_columns(data, MIX_COLUMN_MATRIX_INV))
         data = shift_rows_inv(data)
         data = sub_bytes_inv(data)
-    data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
-
-    return data
+    return xor(data, expanded_key[:BLOCK_SIZE_BYTES])
 
 
 def aes_decrypt_text(data, password, key_size_bytes):
@@ -318,9 +310,7 @@ def aes_decrypt_text(data, password, key_size_bytes):
     cipher = data[NONCE_LENGTH_BYTES:]
 
     decrypted_data = aes_ctr_decrypt(cipher, key, nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES))
-    plaintext = intlist_to_bytes(decrypted_data)
-
-    return plaintext
+    return intlist_to_bytes(decrypted_data)
 
 
 RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
@@ -428,9 +418,7 @@ def key_expansion(data):
         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
+    return data[:expanded_key_size_bytes]
 
 
 def iter_vector(iv):
@@ -511,7 +499,7 @@ 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)
+        raise ValueError(f'Length of blocks need to be {BLOCK_SIZE_BYTES} bytes')
 
     block_r = [0xE1] + [0] * (BLOCK_SIZE_BYTES - 1)
     block_v = block_y[:]
@@ -534,7 +522,7 @@ 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)
+        raise ValueError(f'Length of data should be {BLOCK_SIZE_BYTES} bytes')
 
     last_y = [0] * BLOCK_SIZE_BYTES
     for i in range(0, len(data), BLOCK_SIZE_BYTES):