- block_size = 0
- n = key[0]
- while n:
- block_size += 1
- n >>= 8
- signature = pow(int(signature, 16), key[1], key[0])
- raw_bytes = []
- while signature:
- raw_bytes.insert(0, pack("B", signature & 0xFF))
- signature >>= 8
- signature = (block_size - len(raw_bytes)) * b'\x00' + b''.join(raw_bytes)
- if signature[0:2] != b'\x00\x01':
- return False
- signature = signature[2:]
- if b'\x00' not in signature:
+ byte_size = (len(bin(key[0])) - 2 + 8 - 1) // 8
+ signature = ('%x' % pow(int(signature, 16), key[1], key[0])).encode()
+ signature = (byte_size * 2 - len(signature)) * b'0' + signature
+ asn1 = b'3031300d060960864801650304020105000420'
+ asn1 += sha256(message).hexdigest().encode()
+ if byte_size < len(asn1) // 2 + 11: