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[utils] Add pkcs1pad

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Used in daisuki.net (#4738)
This commit is contained in:
Yen Chi Hsuan 2017-02-27 18:50:19 +08:00
parent c9619f0a17
commit f48409c7ac
2 changed files with 24 additions and 0 deletions
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9
test/test_utils.py
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@ -52,6 +52,7 @@ from youtube_dl.utils import (
parse_filesize, parse_filesize,
parse_count, parse_count,
parse_iso8601, parse_iso8601,
pkcs1pad,
read_batch_urls, read_batch_urls,
sanitize_filename, sanitize_filename,
sanitize_path, sanitize_path,
@ -1104,6 +1105,14 @@ The first line
ohdave_rsa_encrypt(b'aa111222', e, N), ohdave_rsa_encrypt(b'aa111222', e, N),
'726664bd9a23fd0c70f9f1b84aab5e3905ce1e45a584e9cbcf9bcc7510338fc1986d6c599ff990d923aa43c51c0d9013cd572e13bc58f4ae48f2ed8c0b0ba881') '726664bd9a23fd0c70f9f1b84aab5e3905ce1e45a584e9cbcf9bcc7510338fc1986d6c599ff990d923aa43c51c0d9013cd572e13bc58f4ae48f2ed8c0b0ba881')
def test_pkcs1pad(self):
data = [1, 2, 3]
padded_data = pkcs1pad(data, 32)
self.assertEqual(padded_data[:2], [0, 2])
self.assertEqual(padded_data[28:], [0, 1, 2, 3])
self.assertRaises(ValueError, pkcs1pad, data, 8)
def test_encode_base_n(self): def test_encode_base_n(self):
self.assertEqual(encode_base_n(0, 30), '0') self.assertEqual(encode_base_n(0, 30), '0')
self.assertEqual(encode_base_n(80, 30), '2k') self.assertEqual(encode_base_n(80, 30), '2k')

15
youtube_dl/utils.py
View file

@ -3336,6 +3336,21 @@ def ohdave_rsa_encrypt(data, exponent, modulus):
return '%x' % encrypted return '%x' % encrypted
def pkcs1pad(data, length):
"""
Padding input data with PKCS#1 scheme
@param {int[]} data input data
@param {int} length target length
@returns {int[]} padded data
"""
if len(data) > length - 11:
raise ValueError('Input data too long for PKCS#1 padding')
pseudo_random = [random.randint(0, 254) for _ in range(length - len(data) - 3)]
return [0, 2] + pseudo_random + [0] + data
def encode_base_n(num, n, table=None): def encode_base_n(num, n, table=None):
FULL_TABLE = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' FULL_TABLE = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
if not table: if not table: