import getpass as _getpass
import hashlib as _hashlib
+import logging as _logging
import math as _math
import re as _re
import subprocess as _subprocess
import Crypto.Cipher.Blowfish as _crypto_cipher_blowfish
import Crypto.Cipher.CAST as _crypto_cipher_cast
import Crypto.Cipher.DES3 as _crypto_cipher_des3
+import Crypto.PublicKey.DSA as _crypto_publickey_dsa
+import Crypto.PublicKey.ElGamal as _crypto_publickey_elgamal
+import Crypto.PublicKey.RSA as _crypto_publickey_rsa
+import Crypto.Random.random as _crypto_random_random
+import Crypto.Signature.PKCS1_v1_5 as _crypto_signature_pkcs1_v1_5
+import Crypto.Hash.SHA as _crypto_hash_sha
+
+
+LOG = _logging.getLogger('gpg-migrate')
+LOG.addHandler(_logging.StreamHandler())
+LOG.setLevel(_logging.WARNING)
def _get_stdout(args, stdin=None):
}
_crypto_module = {
+ # symmetric-key encryption
'aes with 128-bit key': _crypto_cipher_aes,
'aes with 192-bit key': _crypto_cipher_aes,
'aes with 256-bit key': _crypto_cipher_aes,
'blowfish': _crypto_cipher_blowfish,
'cast5': _crypto_cipher_cast,
'tripledes': _crypto_cipher_des3,
+ # public-key encryption
+ 'dsa (digital signature algorithm)': _crypto_publickey_dsa,
+ 'elgamal (encrypt-only)': _crypto_publickey_elgamal,
+ 'rsa (encrypt or sign)': _crypto_publickey_rsa,
+ 'rsa encrypt-only': _crypto_publickey_rsa,
+ 'rsa sign-only': _crypto_publickey_rsa,
}
_key_size = { # in bits
"""
return [k for k,v in dict.items() if v == value][0]
+ def copy(self):
+ packet = PGPPacket(key=self.key)
+ packet.update(self)
+ return packet
+
def __str__(self):
method_name = '_str_{}'.format(self._clean_type())
method = getattr(self, method_name, None)
'algorithm-specific key fields for {}'.format(
self['public-key-algorithm']))
fingerprint = _hashlib.sha1()
- fingerprint.update(b'\x99')
- fingerprint.update(_struct.pack('>H', len(data)))
- fingerprint.update(data)
+ fingerprint.update(
+ self._serialize_signature_packet_target(target=self))
self['fingerprint'] = fingerprint.hexdigest()
return offset
offset += unhashed_count
self['signed-hash-word'] = data[offset: offset + 2]
offset += 2
- self['signature'] = data[offset:]
+ self['signature'] = []
+ while offset < len(data):
+ o, mpi = self._parse_multiprecision_integer(data=data[offset:])
+ offset += o
+ self['signature'].append(mpi)
+ if self.key.secret_packets:
+ packets = self.key.secret_packets
+ else:
+ packets = self.key.public_packets
if self['signature-type'] == 'standalone':
self['target'] = None
elif self['signature-type'].endswith(' user id and public-key packet'):
self['target'] = [
- [p for p in self.key.public_packets if p['type'] == 'public-key packet'][-1],
- [p for p in self.key.public_packets if p['type'] == 'user id packet'][-1],
+ packets[0],
+ [p for p in packets if p['type'] == 'user id packet'][-1],
+ ]
+ elif self['signature-type'].endswith('key binding'):
+ self['target'] = [
+ packets[0],
+ [p for p in packets if p['type'] == 'public-subkey packet'][-1],
]
else:
raise NotImplementedError(
'target for {}'.format(self['signature-type']))
+ self.verify()
def _parse_signature_creation_time_signature_subpacket(
self, data, subpacket):
def _parse_embedded_signature_signature_subpacket(self, data, subpacket):
subpacket['embedded'] = PGPPacket(key=self.key)
+ subpacket['embedded']['type'] = 'signature packet'
+ subpacket['embedded']['embedded'] = True
subpacket['embedded']._parse_signature_packet(data=data)
+ subpacket['embedded']['raw'] = data
def _parse_user_id_packet(self, data):
self['user'] = str(data, 'utf-8')
def to_bytes(self):
- method_name = '_serialize_{}'.format(self._clean_type())
- method = getattr(self, method_name, None)
- if not method:
- raise NotImplementedError(
- 'cannot serialize packet type {!r}'.format(self['type']))
- body = method()
+ body = self._serialize_body()
+ if body is None:
+ raise ValueError(method)
self['length'] = len(body)
return b''.join([
self._serialize_header(),
length_data,
])
+ def _serialize_body(self):
+ method_name = '_serialize_{}'.format(self._clean_type())
+ method = getattr(self, method_name, None)
+ if not method:
+ raise NotImplementedError(
+ 'cannot serialize packet type {!r}'.format(self['type']))
+ return method()
+
@staticmethod
def _serialize_multiprecision_integer(integer):
r"""Serialize RFC 4880's multipricision integers
self['public-key-algorithm']))
return b''.join(chunks)
+ def _serialize_signature_subpackets(self, subpackets):
+ return b''.join(
+ self._serialize_signature_subpacket(subpacket=subpacket)
+ for subpacket in subpackets)
+
+ def _serialize_signature_subpacket(self, subpacket):
+ method_name = '_serialize_{}_signature_subpacket'.format(
+ self._clean_type(type=subpacket['type']))
+ method = getattr(self, method_name, None)
+ if not method:
+ raise NotImplementedError(
+ 'cannot serialize signature subpacket type {!r}'.format(
+ subpacket['type']))
+ body = method(subpacket=subpacket)
+ length = len(body) + 1
+ chunks = []
+ if length < 192:
+ chunks.append(bytes([length]))
+ else:
+ first = ((length - 192) >> 8) + 192
+ if first < 255:
+ chunks.extend([
+ first,
+ (length - 192) % 256,
+ ])
+ else:
+ chunks.append(_struct.pack('>I', length))
+ chunks.append(bytes([self._reverse(
+ self._signature_subpacket_types, subpacket['type'])]))
+ chunks.append(body)
+ return b''.join(chunks)
+
+ def _serialize_signature_packet_target(self, target):
+ if target is None:
+ return b''
+ elif isinstance(target, bytes):
+ return target
+ elif isinstance(target, PGPPacket):
+ if target['type'].endswith('-subkey packet'):
+ target = target.copy()
+ target['type'] = target['type'].replace(
+ '-subkey packet', '-key packet')
+ serialized = target._serialize_body()
+ if target['type'] in [
+ 'public-key packet',
+ 'public-subkey packet'
+ 'secret-key packet',
+ 'secret-subkey packet'
+ ]:
+ serialized = b''.join([
+ b'\x99',
+ _struct.pack('>H', len(serialized)),
+ serialized,
+ ])
+ elif target['type'] == 'user id packet':
+ serialized = b''.join([
+ b'\xb4',
+ _struct.pack('>I', len(serialized)),
+ serialized,
+ ])
+ elif target['type'] == 'user attribute packet':
+ serialized = b''.join([
+ b'\xd1',
+ _struct.pack('>I', len(serialized)),
+ serialized,
+ ])
+ return serialized
+ elif isinstance(target, list):
+ return b''.join(
+ self._serialize_signature_packet_target(target=x)
+ for x in target)
+
+ def _serialize_hashed_signature_packet(self):
+ if self['signature-version'] != 4:
+ raise NotImplementedError(
+ 'signature packet version {}'.format(
+ self['signature-version']))
+ chunks = [bytes([self['signature-version']])]
+ chunks.append(bytes([self._reverse(
+ self._signature_types, self['signature-type'])]))
+ chunks.append(bytes([self._reverse(
+ self._public_key_algorithms, self['public-key-algorithm'])]))
+ chunks.append(bytes([self._reverse(
+ self._hash_algorithms, self['hash-algorithm'])]))
+ hashed_subpackets = self._serialize_signature_subpackets(
+ self['hashed-subpackets'])
+ chunks.append(_struct.pack('>H', len(hashed_subpackets)))
+ chunks.append(hashed_subpackets)
+ return b''.join(chunks)
+
+ def _signature_packet_signed_data(self, hashed_signature_data):
+ target = self._serialize_signature_packet_target(target=self['target'])
+ return b''.join([
+ target,
+ hashed_signature_data,
+ bytes([self['signature-version']]),
+ b'\xff',
+ _struct.pack('>I', len(hashed_signature_data)),
+ ])
+
+ def _serialize_signature_packet(self):
+ hashed_signature_data = self._serialize_hashed_signature_packet()
+ chunks = [hashed_signature_data]
+ unhashed_subpackets = self._serialize_signature_subpackets(
+ self['unhashed-subpackets'])
+ chunks.append(_struct.pack('>H', len(unhashed_subpackets)))
+ chunks.append(unhashed_subpackets)
+ signed_data = self._signature_packet_signed_data(
+ hashed_signature_data=hashed_signature_data)
+ digest, signature = self.key.sign(
+ data=signed_data, hash_algorithm=self['hash-algorithm'],
+ signature_algorithm=self['public-key-algorithm'])
+ chunks.append(digest[:2])
+ chunks.extend(
+ self._serialize_multiprecision_integer(integer=integer)
+ for integer in signature)
+ return b''.join(chunks)
+
+ def _serialize_signature_creation_time_signature_subpacket(
+ self, subpacket):
+ return _struct.pack('>I', subpacket['signature-creation-time'])
+
+ def _serialize_issuer_signature_subpacket(self, subpacket):
+ return string_bytes(data=subpacket['issuer'], sep='')
+
+ def _serialize_key_expiration_time_signature_subpacket(self, subpacket):
+ return _struct.pack('>I', subpacket['key-expiration-time'])
+
+ def _serialize_preferred_symmetric_algorithms_signature_subpacket(
+ self, subpacket):
+ return bytes(
+ self._reverse(self._symmetric_key_algorithms, a)
+ for a in subpacket['preferred-symmetric-algorithms'])
+
+ def _serialize_preferred_hash_algorithms_signature_subpacket(
+ self, subpacket):
+ return bytes(
+ self._reverse(self._hash_algorithms, a)
+ for a in subpacket['preferred-hash-algorithms'])
+
+ def _serialize_preferred_compression_algorithms_signature_subpacket(
+ self, subpacket):
+ return bytes(
+ self._reverse(self._compression_algorithms, a)
+ for a in subpacket['preferred-compression-algorithms'])
+
+ def _serialize_key_server_preferences_signature_subpacket(self, subpacket):
+ return bytes([
+ 0x80 * ('no-modify' in subpacket['key-server-preferences']) |
+ 0,
+ ])
+
+ def _serialize_primary_user_id_signature_subpacket(self, subpacket):
+ return bytes([0x1 * subpacket['primary-user-id']])
+
+ def _serialize_key_flags_signature_subpacket(self, subpacket):
+ return bytes([
+ 0x1 * ('can certify' in subpacket['key-flags']) |
+ 0x2 * ('can sign' in subpacket['key-flags']) |
+ 0x4 * ('can encrypt communications' in subpacket['key-flags']) |
+ 0x8 * ('can encrypt storage' in subpacket['key-flags']) |
+ 0x10 * ('private split' in subpacket['key-flags']) |
+ 0x20 * ('can authenticate' in subpacket['key-flags']) |
+ 0x80 * ('private shated' in subpacket['key-flags']) |
+ 0,
+ ])
+
+ def _serialize_features_signature_subpacket(self, subpacket):
+ return bytes([
+ 0x1 * ('modification detection' in subpacket['features']) |
+ 0,
+ ])
+
+ def _serialize_embedded_signature_signature_subpacket(self, subpacket):
+ return subpacket['embedded'].to_bytes()
+
def _serialize_user_id_packet(self):
return self['user'].encode('utf-8')
self['type'], i, byte_string(data=out_chunk),
byte_string(data=in_chunk)))
+ def verify(self):
+ if self['type'] != 'signature packet':
+ raise NotImplmentedError('verify {}'.format(self['type']))
+ hashed_signature_data = self._serialize_hashed_signature_packet()
+ signed_data = self._signature_packet_signed_data(
+ hashed_signature_data=hashed_signature_data)
+ key_packet = None
+ subpackets = self['hashed-subpackets'] + self['unhashed-subpackets']
+ issuer_subpackets = [p for p in subpackets if p['type'] == 'issuer']
+ if issuer_subpackets:
+ issuer = issuer_subpackets[0]
+ packets = (self.key.public_packets or []) + (
+ self.key.secret_packets or [])
+ keys = [k for k in packets
+ if k.get('fingerprint', '').endswith(issuer['issuer'])]
+ if keys:
+ key_packet = keys[-1]
+ else:
+ LOG.info('no packet found for issuer {}'.format(
+ issuer['issuer'][-8:].upper()))
+ return
+ LOG.debug('verify {} with {}'.format(
+ self['signature-type'],
+ key_packet['fingerprint'][-8:].upper()))
+ verified = self.key.verify(
+ data=signed_data, signature=self['signature'],
+ hash_algorithm=self['hash-algorithm'],
+ signature_algorithm=self['public-key-algorithm'],
+ key_packet=key_packet, digest_check=self['signed-hash-word'])
+ if not verified:
+ raise ValueError('verification failed for {}'.format(self))
+ else:
+ LOG.debug('verified {}'.format(self['signature-type']))
+
class PGPKey (object):
"""An OpenPGP key with public and private parts.
def import_from_gpg(self):
key_export = _get_stdout(
['gpg', '--export', self.fingerprint])
- self.public_packets = list(
- self._packets_from_bytes(data=key_export))
+ self.public_packets = []
+ self._packets_from_bytes(list=self.public_packets, data=key_export)
if self.public_packets[0]['type'] != 'public-key packet':
raise ValueError(
'{} does not start with a public-key packet'.format(
self.fingerprint))
key_secret_export = _get_stdout(
['gpg', '--export-secret-keys', self.fingerprint])
- self.secret_packets = list(
- self._packets_from_bytes(data=key_secret_export))
+ self.secret_packets = []
+ self._packets_from_bytes(list=self.secret_packets, data=key_secret_export)
if self.secret_packets[0]['type'] != 'secret-key packet':
raise ValueError(
'{} does not start with a secret-key packet'.format(
for packet in self.public_packets + self.secret_packets:
packet.check_roundtrip()
- def _packets_from_bytes(self, data):
+ def _packets_from_bytes(self, list, data):
offset = 0
while offset < len(data):
packet = PGPPacket(key=self)
offset += packet.from_bytes(data=data[offset:])
- yield packet
+ list.append(packet)
def export_to_gpg(self):
raise NotImplemetedError('export to gpg')
"""Migrate the (sub)keys into this key"""
pass
+ def _get_signer(self, signature_algorithm=None, key_packet=None,
+ secret=False):
+ if key_packet is None:
+ if secret:
+ key_packet = self.secret_packets[0]
+ else:
+ key_packet = self.public_packets[0]
+ elif secret:
+ if 'secret' not in key_packet['type']:
+ raise ValueError(
+ '{} is not a secret key'.format(key_packet['type']))
+ if signature_algorithm is None:
+ signature_algorithm = key_packet['public-key-algorithm']
+ if signature_algorithm != key_packet['public-key-algorithm']:
+ raise ValueError(
+ 'cannot act on a {} signature with a {} key'.format(
+ signature_algorithm, key_packet['public-key-algorithm']))
+ module = key_packet._crypto_module[signature_algorithm]
+ if signature_algorithm.startswith('rsa '):
+ key = module.construct((
+ key_packet['public-modulus'], # n
+ key_packet['public-exponent'], # e
+ ))
+ if secret:
+ LOG.debug('secret')
+ key.d = key_packet['secret-exponent']
+ key.p = key_packet['secret-prime-p']
+ key.q = key_packet['secret-prime-q']
+ key.u = key_packet['secret-inverse-of-p-mod-q']
+ signer = _crypto_signature_pkcs1_v1_5.new(key)
+ elif signature_algorithm.startswith('dsa '):
+ signer = module.construct((
+ key_packet['public-key'], # y
+ key_packet['group-generator'], # g
+ key_packet['prime'], # p
+ key_packet['group-order'], # q
+ ))
+ if secret:
+ signer.x = key_packet['secret-exponent']
+ else:
+ raise NotImplementedError(
+ 'construct {}'.format(signature_algorithm))
+ return (key_packet, signer)
+
+ def _hash(self, data, hash_algorithm, key_packet):
+ hash_name = key_packet._hashlib_name[hash_algorithm]
+ data_hash = _hashlib.new(hash_name)
+ data_hash.update(data)
+ return data_hash
+
+ def verify(self, data, signature, hash_algorithm, signature_algorithm=None,
+ key_packet=None, digest_check=None):
+ key_packet, signer = self._get_signer(
+ signature_algorithm=signature_algorithm, key_packet=key_packet)
+ data_hash = self._hash(
+ data=data, hash_algorithm=hash_algorithm, key_packet=key_packet)
+ digest = data_hash.digest()
+ hexdigest = data_hash.hexdigest()
+ if digest_check and not digest.startswith(digest_check):
+ raise ValueError(
+ 'corrupted hash: {} does not start with {}'.format(
+ byte_string(digest),
+ byte_string(digest_check)))
+ if signature_algorithm.startswith('rsa '):
+ sig_hex = '{:x}'.format(signature[0])
+ signature = string_bytes(data=sig_hex, sep='')
+ elif signature_algorithm.startswith('dsa '):
+ data_hash = digest
+ LOG.debug('verify signature {} on {} with {}'.format(
+ signature, hexdigest, signer))
+ return signer.verify(data_hash, signature)
+
def migrate(old_key, new_key, cache_passphrase=False):
"""Add the old key and sub-keys to the new key
projects / gpg-migrate.git / blobdiff