diff options
Diffstat (limited to 'youtube_dl/aes.py')
| -rw-r--r-- | youtube_dl/aes.py | 361 |
1 files changed, 0 insertions, 361 deletions
diff --git a/youtube_dl/aes.py b/youtube_dl/aes.py deleted file mode 100644 index 461bb6d..0000000 --- a/youtube_dl/aes.py +++ /dev/null @@ -1,361 +0,0 @@ -from __future__ import unicode_literals - -from math import ceil - -from .compat import compat_b64decode -from .utils import bytes_to_intlist, intlist_to_bytes - -BLOCK_SIZE_BYTES = 16 - - -def aes_ctr_decrypt(data, key, counter): - """ - Decrypt with aes in counter mode - - @param {int[]} data cipher - @param {int[]} key 16/24/32-Byte cipher key - @param {instance} counter Instance whose next_value function (@returns {int[]} 16-Byte block) - returns the next counter block - @returns {int[]} decrypted data - """ - expanded_key = key_expansion(key) - block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) - - decrypted_data = [] - for i in range(block_count): - counter_block = counter.next_value() - block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] - block += [0] * (BLOCK_SIZE_BYTES - len(block)) - - cipher_counter_block = aes_encrypt(counter_block, expanded_key) - decrypted_data += xor(block, cipher_counter_block) - decrypted_data = decrypted_data[:len(data)] - - return decrypted_data - - -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_encrypt(data, key, iv): - """ - Encrypt with aes in CBC mode. Using PKCS#7 padding - - @param {int[]} data cleartext - @param {int[]} key 16/24/32-Byte cipher key - @param {int[]} iv 16-Byte IV - @returns {int[]} encrypted data - """ - expanded_key = key_expansion(key) - block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) - - encrypted_data = [] - previous_cipher_block = iv - for i in range(block_count): - block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] - remaining_length = BLOCK_SIZE_BYTES - len(block) - block += [remaining_length] * remaining_length - mixed_block = xor(block, previous_cipher_block) - - encrypted_block = aes_encrypt(mixed_block, expanded_key) - encrypted_data += encrypted_block - - previous_cipher_block = encrypted_block - - return encrypted_data - - -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 aes_encrypt(data, expanded_key): - """ - Encrypt one block with aes - - @param {int[]} data 16-Byte state - @param {int[]} expanded_key 176/208/240-Byte expanded key - @returns {int[]} 16-Byte cipher - """ - rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1 - - data = xor(data, expanded_key[:BLOCK_SIZE_BYTES]) - for i in range(1, rounds + 1): - data = sub_bytes(data) - data = shift_rows(data) - if i != rounds: - data = mix_columns(data) - data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_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 - - -def aes_decrypt_text(data, password, key_size_bytes): - """ - Decrypt text - - The first 8 Bytes of decoded 'data' are the 8 high Bytes of the counter - - The cipher key is retrieved by encrypting the first 16 Byte of 'password' - with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's) - - Mode of operation is 'counter' - - @param {str} data Base64 encoded string - @param {str,unicode} password Password (will be encoded with utf-8) - @param {int} key_size_bytes Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit - @returns {str} Decrypted data - """ - NONCE_LENGTH_BYTES = 8 - - data = bytes_to_intlist(compat_b64decode(data)) - password = bytes_to_intlist(password.encode('utf-8')) - - key = password[:key_size_bytes] + [0] * (key_size_bytes - len(password)) - key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES) - - nonce = data[:NONCE_LENGTH_BYTES] - cipher = data[NONCE_LENGTH_BYTES:] - - class Counter(object): - __value = nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES) - - def next_value(self): - temp = self.__value - self.__value = inc(self.__value) - return temp - - decrypted_data = aes_ctr_decrypt(cipher, key, Counter()) - plaintext = intlist_to_bytes(decrypted_data) - - return plaintext - - -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(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 - - -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 - - -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 - - -__all__ = ['aes_encrypt', 'key_expansion', 'aes_ctr_decrypt', 'aes_cbc_decrypt', 'aes_decrypt_text'] |