def decrypt_secret_key(self, passphrase):
if hasattr(passphrase, 'encode'):
passphrase = passphrase.encode('utf-8')
packet = copy.copy(self._message or self._key) # Do not mutate original
cipher, key_bytes, key_block_bytes = self.get_cipher(packet.symmetric_algorithm)
cipher = cipher(packet.s2k.make_key(passphrase, key_bytes))
cipher = cipher(packet.encrypted_data[:key_block_bytes])
material = self._block_pad_unpad(key_block_bytes, packet.encrypted_data[key_block_bytes:], lambda x: cipher.decrypt(x))
if packet.s2k_useage == 254:
chk = material[-20:]
material = material[:-20]
if(chk != hashlib.sha1(material)):
return None
else:
chk = unpack('!H', material[-2:])[0]
material = material[:-2]
if chk != OpenPGP.checksum(material):
return None
packet.s2k_usage = 0
packet.symmetric_alorithm = 0
packet.encrypted_data = None
packet.input = OpenPGP.PushbackGenerator(OpenPGP._gen_one(material))
packet.length = len(material)
packet.key_from_input()
packet.input = None
return packet
def decrypt_secret_key(self, passphrase):
if hasattr(passphrase, 'encode'):
passphrase = passphrase.encode('utf-8')
packet = copy.copy(self._message or self._key) # Do not mutate original
cipher, key_bytes, key_block_bytes = self.get_cipher(packet.symmetric_algorithm)
cipher = cipher(packet.s2k.make_key(passphrase, key_bytes))
cipher = cipher(packet.encrypted_data[:key_block_bytes]).decryptor()
pad_amount = key_block_bytes - (len(packet.encrypted_data[key_block_bytes:]) % key_block_bytes)
material = cipher.update(packet.encrypted_data[key_block_bytes:] + (pad_amount*b'\0'))
material += cipher.finalize()
material = material[:-pad_amount]
if packet.s2k_useage == 254:
chk = material[-20:]
material = material[:-20]
if(chk != hashlib.sha1(material)):
return None
else:
chk = unpack('!H', material[-2:])[0]
material = material[:-2]
if chk != OpenPGP.checksum(material):
return None
packet.s2k_usage = 0
packet.symmetric_alorithm = 0
packet.encrypted_data = None
packet.input = OpenPGP.PushbackGenerator(OpenPGP._gen_one(material))
packet.length = len(material)
packet.key_from_input()
packet.input = None
return packet
def decrypt_secret_key(self, passphrase):
if hasattr(passphrase, "encode"):
passphrase = passphrase.encode("utf-8")
packet = copy.copy(self._message or self._key) # Do not mutate original
cipher, key_bytes, key_block_bytes = self.get_cipher(packet.symmetric_algorithm)
cipher = cipher(packet.s2k.make_key(passphrase, key_bytes))
cipher = cipher(packet.encrypted_data[:key_block_bytes]).decryptor()
pad_amount = key_block_bytes - (len(packet.encrypted_data[key_block_bytes:]) % key_block_bytes)
material = cipher.update(packet.encrypted_data[key_block_bytes:] + (pad_amount * b"\0"))
material += cipher.finalize()
material = material[:-pad_amount]
if packet.s2k_useage == 254:
chk = material[-20:]
material = material[:-20]
if chk != hashlib.sha1(material):
return None
else:
chk = unpack("!H", material[-2:])[0]
material = material[:-2]
if chk != OpenPGP.checksum(material):
return None
packet.s2k_usage = 0
packet.symmetric_alorithm = 0
packet.encrypted_data = None
packet.input = OpenPGP.PushbackGenerator(OpenPGP._gen_one(material))
packet.length = len(material)
packet.key_from_input()
packet.input = None
return packet
