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import base64
import hashlib
from Cryptodome.PublicKey import RSA
from Cryptodome.Cipher import PKCS1_OAEP
from .util import bytes_to_long, long_to_bytes
def key_from_b64(b64_key):
binaryKey = base64.b64decode(b64_key)
i = bytes_to_long(binaryKey[:4])
mod = bytes_to_long(binaryKey[4:4+i])
j = bytes_to_long(binaryKey[i+4:i+4+4])
exponent = bytes_to_long(binaryKey[i+8:i+8+j])
key = RSA.construct((mod, exponent))
return key
def key_to_struct(key):
mod = long_to_bytes(key.n)
exponent = long_to_bytes(key.e)
return b'\x00\x00\x00\x80' + mod + b'\x00\x00\x00\x03' + exponent
def parse_auth_response(text):
response_data = {}
for line in text.split('\n'):
if not line:
continue
key, _, val = line.partition('=')
response_data[key] = val
return response_data
def signature(email, password, key):
signature = bytearray(b'\x00')
struct = key_to_struct(key)
signature.extend(hashlib.sha1(struct).digest()[:4])
cipher = PKCS1_OAEP.new(key)
encrypted_login = cipher.encrypt((email + u'\x00' + password).encode('utf-8'))
signature.extend(encrypted_login)
return base64.urlsafe_b64encode(signature)
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