#!/usr/bin/python
+import hashlib as _hashlib
+import re as _re
import subprocess as _subprocess
import struct as _struct
3: (None, None),
}
+ _packet_types = {
+ 0: 'reserved',
+ 1: 'public-key encrypted session key packet',
+ 2: 'signature packet',
+ 3: 'symmetric-key encrypted session key packet',
+ 4: 'one-pass signature packet',
+ 5: 'secret-key packet',
+ 6: 'public-key packet',
+ 7: 'secret-subkey packet',
+ 8: 'compressed data packet',
+ 9: 'symmetrically encrypted data packet',
+ 10: 'marker packet',
+ 11: 'literal data packet',
+ 12: 'trust packet',
+ 13: 'user id packet',
+ 14: 'public-subkey packet',
+ 17: 'user attribute packet',
+ 18: 'sym. encrypted and integrity protected data packet',
+ 19: 'modification detection code packet',
+ 60: 'private',
+ 61: 'private',
+ 62: 'private',
+ 63: 'private',
+ }
+
+ _public_key_algorithms = {
+ 1: 'rsa (encrypt or sign)',
+ 2: 'rsa encrypt-only',
+ 3: 'rsa sign-only',
+ 16: 'elgamal (encrypt-only)',
+ 17: 'dsa (digital signature algorithm)',
+ 18: 'reserved for elliptic curve',
+ 19: 'reserved for ecdsa',
+ 20: 'reserved (formerly elgamal encrypt or sign)',
+ 21: 'reserved for diffie-hellman',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _symmetric_key_algorithms = {
+ 0: 'plaintext or unencrypted data',
+ 1: 'idea',
+ 2: 'tripledes',
+ 3: 'cast5',
+ 4: 'blowfish',
+ 5: 'reserved',
+ 6: 'reserved',
+ 7: 'aes with 128-bit key',
+ 8: 'aes with 192-bit key',
+ 9: 'aes with 256-bit key',
+ 10: 'twofish',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _cipher_block_size = { # in bits
+ 'aes with 128-bit key': 128,
+ 'aes with 192-bit key': 128,
+ 'aes with 256-bit key': 128,
+ 'cast5': 64,
+ }
+
+ _compression_algorithms = {
+ 0: 'uncompressed',
+ 1: 'zip',
+ 2: 'zlib',
+ 3: 'bzip2',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _hash_algorithms = {
+ 1: 'md5',
+ 2: 'sha-1',
+ 3: 'ripe-md/160',
+ 4: 'reserved',
+ 5: 'reserved',
+ 6: 'reserved',
+ 7: 'reserved',
+ 8: 'sha256',
+ 9: 'sha384',
+ 10: 'sha512',
+ 11: 'sha224',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _string_to_key_types = {
+ 0: 'simple',
+ 1: 'salted',
+ 2: 'reserved',
+ 3: 'iterated and salted',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _signature_types = {
+ 0x00: 'binary document',
+ 0x01: 'canonical text document',
+ 0x02: 'standalone',
+ 0x10: 'generic user id and public-key packet',
+ 0x11: 'persona user id and public-key packet',
+ 0x12: 'casual user id and public-key packet',
+ 0x13: 'postitive user id and public-key packet',
+ 0x18: 'subkey binding',
+ 0x19: 'primary key binding',
+ 0x1F: 'direct key',
+ 0x20: 'key revocation',
+ 0x28: 'subkey revocation',
+ 0x30: 'certification revocation',
+ 0x40: 'timestamp',
+ 0x50: 'third-party confirmation',
+ }
+
+ _signature_subpacket_types = {
+ 0: 'reserved',
+ 1: 'reserved',
+ 2: 'signature creation time',
+ 3: 'signature expiration time',
+ 4: 'exportable certification',
+ 5: 'trust signature',
+ 6: 'regular expression',
+ 7: 'revocable',
+ 8: 'reserved',
+ 9: 'key expiration time',
+ 10: 'placeholder for backward compatibility',
+ 11: 'preferred symmetric algorithms',
+ 12: 'revocation key',
+ 13: 'reserved',
+ 14: 'reserved',
+ 15: 'reserved',
+ 16: 'issuer',
+ 17: 'reserved',
+ 18: 'reserved',
+ 19: 'reserved',
+ 20: 'notation data',
+ 21: 'preferred hash algorithms',
+ 22: 'preferred compression algorithms',
+ 23: 'key server preferences',
+ 24: 'preferred key server',
+ 25: 'primary user id',
+ 26: 'policy uri',
+ 27: 'key flags',
+ 28: 'signer user id',
+ 29: 'reason for revocation',
+ 30: 'features',
+ 31: 'signature target',
+ 32: 'embedded signature',
+ 100: 'private',
+ 101: 'private',
+ 102: 'private',
+ 103: 'private',
+ 104: 'private',
+ 105: 'private',
+ 106: 'private',
+ 107: 'private',
+ 108: 'private',
+ 109: 'private',
+ 110: 'private',
+ }
+
+ _clean_type_regex = _re.compile('\W+')
+
+ def _clean_type(self):
+ return self._clean_type_regex.sub('_', self['type'])
+
+ def __str__(self):
+ method_name = '_str_{}'.format(self._clean_type())
+ method = getattr(self, method_name, None)
+ if not method:
+ return self['type']
+ details = method()
+ return '{}: {}'.format(self['type'], details)
+
+ def _str_public_key_packet(self):
+ return self._str_generic_key_packet()
+
+ def _str_public_subkey_packet(self):
+ return self._str_generic_key_packet()
+
+ def _str_secret_key_packet(self):
+ return self._str_generic_key_packet()
+
+ def _str_secret_subkey_packet(self):
+ return self._str_generic_key_packet()
+
+ def _str_generic_key_packet(self):
+ return self['fingerprint'][-8:].upper()
+
+ def _str_signature_packet(self):
+ lines = [self['signature-type']]
+ if self['unhashed-subpackets']:
+ lines.append(' unhashed subpackets:')
+ for subpacket in self['unhashed-subpackets']:
+ lines.append(' {}'.format(subpacket['type']))
+ return '\n'.join(lines)
+
+ def _str_user_id_packet(self):
+ return self['user']
+
def from_bytes(self, data):
+ offset = self._parse_header(data=data)
+ packet = data[offset:offset + self['length']]
+ if len(packet) < self['length']:
+ raise ValueError('packet too short ({} < {})'.format(
+ len(packet), self['length']))
+ offset += self['length']
+ method_name = '_parse_{}'.format(self._clean_type())
+ method = getattr(self, method_name, None)
+ if not method:
+ raise NotImplementedError(
+ 'cannot parse packet type {!r}'.format(self['type']))
+ method(data=packet)
+ return offset
+
+ def _parse_header(self, data):
packet_tag = data[0]
+ offset = 1
always_one = packet_tag & 1 << 7
if not always_one:
raise ValueError('most significant packet tag bit not set')
self['new-format'] = packet_tag & 1 << 6
if self['new-format']:
- self['packet-tag'] = packet_tag & 0b111111
+ type_code = packet_tag & 0b111111
raise NotImplementedError('new-format packet length')
else:
- self['packet-tag'] = packet_tag >> 2 & 0b1111
+ type_code = packet_tag >> 2 & 0b1111
self['length-type'] = packet_tag & 0b11
length_bytes, length_type = self._old_format_packet_length_type[
self['length-type']]
if not length_bytes:
raise NotImplementedError(
'old-format packet of indeterminate length')
+ length_format = '>{}'.format(length_type)
+ length_data = data[offset: offset + length_bytes]
+ offset += length_bytes
+ self['length'] = _struct.unpack(length_format, length_data)[0]
+ self['type'] = self._packet_types[type_code]
+ return offset
+
+ @staticmethod
+ def _parse_multiprecision_integer(data):
+ r"""Parse RFC 4880's multiprecision integers
+
+ >>> PGPPacket._parse_multiprecision_integer(b'\x00\x01\x01')
+ (3, 1)
+ >>> PGPPacket._parse_multiprecision_integer(b'\x00\x09\x01\xff')
+ (4, 511)
+ """
+ bits = _struct.unpack('>H', data[:2])[0]
+ offset = 2
+ length = (bits + 7) // 8
+ value = 0
+ for i in range(length):
+ value += data[offset + i] * 1 << (8 * (length - i - 1))
+ offset += length
+ return (offset, value)
+
+ def _parse_string_to_key_specifier(self, data):
+ self['string-to-key-type'] = self._string_to_key_types[data[0]]
+ offset = 1
+ if self['string-to-key-type'] == 'simple':
+ self['string-to-key-hash-algorithm'] = self._hash_algorithms[
+ data[offset]]
+ offset += 1
+ elif self['string-to-key-type'] == 'salted':
+ self['string-to-key-hash-algorithm'] = self._hash_algorithms[
+ data[offset]]
+ offset += 1
+ self['string-to-key-salt'] = data[offset: offset + 8]
+ offset += 8
+ elif self['string-to-key-type'] == 'iterated and salted':
+ self['string-to-key-hash-algorithm'] = self._hash_algorithms[
+ data[offset]]
+ offset += 1
+ self['string-to-key-salt'] = data[offset: offset + 8]
+ offset += 8
+ self['string-to-key-coded-count'] = data[offset]
+ offset += 1
+ else:
+ raise NotImplementedError(
+ 'string-to-key type {}'.format(self['string-to-key-type']))
+ return offset
+
+ def _parse_public_key_packet(self, data):
+ self._parse_generic_public_key_packet(data=data)
+
+ def _parse_public_subkey_packet(self, data):
+ self._parse_generic_public_key_packet(data=data)
+
+ def _parse_generic_public_key_packet(self, data):
+ self['key-version'] = data[0]
+ offset = 1
+ if self['key-version'] != 4:
+ raise NotImplementedError(
+ 'public (sub)key packet version {}'.format(
+ self['key-version']))
+ length = 5
+ self['creation-time'], algorithm = _struct.unpack(
+ '>IB', data[offset: offset + length])
+ offset += length
+ self['public-key-algorithm'] = self._public_key_algorithms[algorithm]
+ if self['public-key-algorithm'].startswith('rsa '):
+ o, self['public-modulus'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['public-exponent'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ elif self['public-key-algorithm'].startswith('dsa '):
+ o, self['prime'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['group-order'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['group-generator'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['public-key'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ elif self['public-key-algorithm'].startswith('elgamal '):
+ o, self['prime'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['group-generator'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ o, self['public-key'] = self._parse_multiprecision_integer(
+ data[offset:])
+ offset += o
+ else:
+ raise NotImplementedError(
+ '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)
+ self['fingerprint'] = fingerprint.hexdigest()
+ return offset
+
+ def _parse_secret_key_packet(self, data):
+ self._parse_generic_secret_key_packet(data=data)
+
+ def _parse_secret_subkey_packet(self, data):
+ self._parse_generic_secret_key_packet(data=data)
+
+ def _parse_generic_secret_key_packet(self, data):
+ offset = self._parse_generic_public_key_packet(data=data)
+ string_to_key_usage = data[offset]
+ offset += 1
+ if string_to_key_usage in [255, 254]:
+ self['symmetric-encryption-algorithm'] = (
+ self._symmetric_key_algorithms[data[offset]])
+ offset += 1
+ offset += self._parse_string_to_key_specifier(data=data[offset:])
+ else:
+ self['symmetric-encryption-algorithm'] = (
+ self._symmetric_key_algorithms[string_to_key_usage])
+ if string_to_key_usage:
+ block_size_bits = self._cipher_block_size.get(
+ self['symmetric-encryption-algorithm'], None)
+ if block_size_bits % 8:
+ raise NotImplementedError(
+ ('{}-bit block size for {} is not an integer number of bytes'
+ ).format(
+ block_size_bits, self['symmetric-encryption-algorithm']))
+ block_size = block_size_bits // 8
+ if not block_size:
+ raise NotImplementedError(
+ 'unknown block size for {}'.format(
+ self['symmetric-encryption-algorithm']))
+ self['initial-vector'] = data[offset: offset + block_size]
+ offset += block_size
+ if string_to_key_usage in [0, 255]:
+ key_end = -2
+ else:
+ key_end = 0
+ self['secret-key'] = data[offset:key_end]
+ if key_end:
+ self['secret-key-checksum'] = data[key_end:]
+
+ def _parse_signature_subpackets(self, data):
+ offset = 0
+ while offset < len(data):
+ o, subpacket = self._parse_signature_subpacket(data=data[offset:])
+ offset += o
+ yield subpacket
+
+ def _parse_signature_subpacket(self, data):
+ subpacket = {}
+ first = data[0]
+ offset = 1
+ if first < 192:
+ length = first
+ elif first >= 192 and first < 255:
+ second = data[offset]
+ offset += 1
+ length = ((first - 192) << 8) + second + 192
+ else:
+ length = _struct.unpack(
+ '>I', data[offset: offset + 4])[0]
+ offset += 4
+ subpacket['type'] = self._signature_subpacket_types[data[offset]]
+ offset += 1
+ subpacket['data'] = data[offset: offset + length - 1]
+ offset += len(subpacket['data'])
+ return (offset, subpacket)
+
+ def _parse_signature_packet(self, data):
+ self['signature-version'] = data[0]
+ offset = 1
+ if self['signature-version'] != 4:
+ raise NotImplementedError(
+ 'signature packet version {}'.format(
+ self['signature-version']))
+ self['signature-type'] = self._signature_types[data[offset]]
+ offset += 1
+ self['public-key-algorithm'] = self._public_key_algorithms[
+ data[offset]]
+ offset += 1
+ self['hash-algorithm'] = self._hash_algorithms[data[offset]]
+ offset += 1
+ hashed_count = _struct.unpack('>H', data[offset: offset + 2])[0]
+ offset += 2
+ self['hashed-subpackets'] = data[offset: offset + hashed_count]
+ offset += hashed_count
+ unhashed_count = _struct.unpack('>H', data[offset: offset + 2])[0]
+ offset += 2
+ self['unhashed-subpackets'] = list(self._parse_signature_subpackets(
+ data=data[offset: offset + unhashed_count]))
+ offset += unhashed_count
+ self['signed-hash-word'] = data[offset: offset + 2]
+ offset += 2
+ self['signature'] = data[offset:]
+
+ def _parse_user_id_packet(self, data):
+ self['user'] = str(data, 'utf-8')
def to_bytes(self):
pass
+def packets_from_bytes(data):
+ offset = 0
+ while offset < len(data):
+ packet = PGPPacket()
+ offset += packet.from_bytes(data=data[offset:])
+ yield packet
+
+
+class PGPKey (object):
+ def __init__(self, fingerprint):
+ self.fingerprint = fingerprint
+ self.public_packets = None
+ self.secret_packets = None
+
+ def __str__(self):
+ lines = ['key: {}'.format(self.fingerprint)]
+ if self.public_packets:
+ lines.append(' public:')
+ for packet in self.public_packets:
+ lines.extend(self._str_packet(packet=packet, prefix=' '))
+ if self.secret_packets:
+ lines.append(' secret:')
+ for packet in self.secret_packets:
+ lines.extend(self._str_packet(packet=packet, prefix=' '))
+ return '\n'.join(lines)
+
+ def _str_packet(self, packet, prefix):
+ lines = str(packet).split('\n')
+ return [prefix + line for line in lines]
+
+ def import_from_gpg(self):
+ key_export = _get_stdout(
+ ['gpg', '--export', self.fingerprint])
+ self.public_packets = list(
+ packets_from_bytes(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(
+ packets_from_bytes(data=key_secret_export))
+
+ def export_to_gpg(self):
+ raise NotImplemetedError('export to gpg')
+
+ def import_from_key(self, key):
+ """Migrate the (sub)keys into this key"""
+ pass
+
+
def migrate(old_key, new_key):
"""Add the old key and sub-keys to the new key
signatures you'd made. You will lose signature *on* your old key
though, since sub-keys can't be signed (I don't think).
"""
- old_key_export = _get_stdout(
- ['gpg', '--export', old_key])
- old_key_packet = PGPPacket()
- old_key_packet.from_bytes(data=old_key_export)
- old_key_secret_export = _get_stdout(
- ['gpg', '--export-secret-keys', old_key])
- old_key_secret_packet = PGPPacket()
- old_key_secret_packet.from_bytes(data=old_key_secret_export)
-
- import pprint
- pprint.pprint(old_key_packet)
- pprint.pprint(old_key_secret_packet)
+ old_key = PGPKey(fingerprint=old_key)
+ old_key.import_from_gpg()
+ new_key = PGPKey(fingerprint=new_key)
+ new_key.import_from_gpg()
+ new_key.import_from_key(key=old_key)
+
+ print(old_key)
+ print(new_key)
if __name__ == '__main__':
projects / gpg-migrate.git / blobdiff