/usr/lib/python3/dist-packages/pgpdump/utils.py is in python3-pgpdump 1.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | import binascii
import sys
PY26 = sys.version_info[0] == 2 and sys.version_info[1] <= 6
if PY26:
import struct
class PgpdumpException(Exception):
'''Base exception class raised by any parsing errors, etc.'''
pass
# 256 values corresponding to each possible byte
CRC24_TABLE = (
0x000000, 0x864cfb, 0x8ad50d, 0x0c99f6, 0x93e6e1, 0x15aa1a, 0x1933ec,
0x9f7f17, 0xa18139, 0x27cdc2, 0x2b5434, 0xad18cf, 0x3267d8, 0xb42b23,
0xb8b2d5, 0x3efe2e, 0xc54e89, 0x430272, 0x4f9b84, 0xc9d77f, 0x56a868,
0xd0e493, 0xdc7d65, 0x5a319e, 0x64cfb0, 0xe2834b, 0xee1abd, 0x685646,
0xf72951, 0x7165aa, 0x7dfc5c, 0xfbb0a7, 0x0cd1e9, 0x8a9d12, 0x8604e4,
0x00481f, 0x9f3708, 0x197bf3, 0x15e205, 0x93aefe, 0xad50d0, 0x2b1c2b,
0x2785dd, 0xa1c926, 0x3eb631, 0xb8faca, 0xb4633c, 0x322fc7, 0xc99f60,
0x4fd39b, 0x434a6d, 0xc50696, 0x5a7981, 0xdc357a, 0xd0ac8c, 0x56e077,
0x681e59, 0xee52a2, 0xe2cb54, 0x6487af, 0xfbf8b8, 0x7db443, 0x712db5,
0xf7614e, 0x19a3d2, 0x9fef29, 0x9376df, 0x153a24, 0x8a4533, 0x0c09c8,
0x00903e, 0x86dcc5, 0xb822eb, 0x3e6e10, 0x32f7e6, 0xb4bb1d, 0x2bc40a,
0xad88f1, 0xa11107, 0x275dfc, 0xdced5b, 0x5aa1a0, 0x563856, 0xd074ad,
0x4f0bba, 0xc94741, 0xc5deb7, 0x43924c, 0x7d6c62, 0xfb2099, 0xf7b96f,
0x71f594, 0xee8a83, 0x68c678, 0x645f8e, 0xe21375, 0x15723b, 0x933ec0,
0x9fa736, 0x19ebcd, 0x8694da, 0x00d821, 0x0c41d7, 0x8a0d2c, 0xb4f302,
0x32bff9, 0x3e260f, 0xb86af4, 0x2715e3, 0xa15918, 0xadc0ee, 0x2b8c15,
0xd03cb2, 0x567049, 0x5ae9bf, 0xdca544, 0x43da53, 0xc596a8, 0xc90f5e,
0x4f43a5, 0x71bd8b, 0xf7f170, 0xfb6886, 0x7d247d, 0xe25b6a, 0x641791,
0x688e67, 0xeec29c, 0x3347a4, 0xb50b5f, 0xb992a9, 0x3fde52, 0xa0a145,
0x26edbe, 0x2a7448, 0xac38b3, 0x92c69d, 0x148a66, 0x181390, 0x9e5f6b,
0x01207c, 0x876c87, 0x8bf571, 0x0db98a, 0xf6092d, 0x7045d6, 0x7cdc20,
0xfa90db, 0x65efcc, 0xe3a337, 0xef3ac1, 0x69763a, 0x578814, 0xd1c4ef,
0xdd5d19, 0x5b11e2, 0xc46ef5, 0x42220e, 0x4ebbf8, 0xc8f703, 0x3f964d,
0xb9dab6, 0xb54340, 0x330fbb, 0xac70ac, 0x2a3c57, 0x26a5a1, 0xa0e95a,
0x9e1774, 0x185b8f, 0x14c279, 0x928e82, 0x0df195, 0x8bbd6e, 0x872498,
0x016863, 0xfad8c4, 0x7c943f, 0x700dc9, 0xf64132, 0x693e25, 0xef72de,
0xe3eb28, 0x65a7d3, 0x5b59fd, 0xdd1506, 0xd18cf0, 0x57c00b, 0xc8bf1c,
0x4ef3e7, 0x426a11, 0xc426ea, 0x2ae476, 0xaca88d, 0xa0317b, 0x267d80,
0xb90297, 0x3f4e6c, 0x33d79a, 0xb59b61, 0x8b654f, 0x0d29b4, 0x01b042,
0x87fcb9, 0x1883ae, 0x9ecf55, 0x9256a3, 0x141a58, 0xefaaff, 0x69e604,
0x657ff2, 0xe33309, 0x7c4c1e, 0xfa00e5, 0xf69913, 0x70d5e8, 0x4e2bc6,
0xc8673d, 0xc4fecb, 0x42b230, 0xddcd27, 0x5b81dc, 0x57182a, 0xd154d1,
0x26359f, 0xa07964, 0xace092, 0x2aac69, 0xb5d37e, 0x339f85, 0x3f0673,
0xb94a88, 0x87b4a6, 0x01f85d, 0x0d61ab, 0x8b2d50, 0x145247, 0x921ebc,
0x9e874a, 0x18cbb1, 0xe37b16, 0x6537ed, 0x69ae1b, 0xefe2e0, 0x709df7,
0xf6d10c, 0xfa48fa, 0x7c0401, 0x42fa2f, 0xc4b6d4, 0xc82f22, 0x4e63d9,
0xd11cce, 0x575035, 0x5bc9c3, 0xdd8538
)
def crc24(data):
'''Implementation of the CRC-24 algorithm used by OpenPGP.'''
# CRC-24-Radix-64
# x24 + x23 + x18 + x17 + x14 + x11 + x10 + x7 + x6
# + x5 + x4 + x3 + x + 1 (OpenPGP)
# 0x864CFB / 0xDF3261 / 0xC3267D
crc = 0x00b704ce
# this saves a bunch of slower global accesses
crc_table = CRC24_TABLE
for byte in data:
tbl_idx = ((crc >> 16) ^ byte) & 0xff
crc = (crc_table[tbl_idx] ^ (crc << 8)) & 0x00ffffff
return crc
def get_int2(data, offset):
'''Pull two bytes from data at offset and return as an integer.'''
return (data[offset] << 8) + data[offset + 1]
def get_int4(data, offset):
'''Pull four bytes from data at offset and return as an integer.'''
return ((data[offset] << 24) + (data[offset + 1] << 16) +
(data[offset + 2] << 8) + data[offset + 3])
def get_int8(data, offset):
'''Pull eight bytes from data at offset and return as an integer.'''
return (get_int4(data, offset) << 32) + get_int4(data, offset + 4)
def get_mpi(data, offset):
'''Gets a multi-precision integer as per RFC-4880.
Returns the MPI and the new offset.
See: http://tools.ietf.org/html/rfc4880#section-3.2'''
mpi_len = get_int2(data, offset)
offset += 2
to_process = (mpi_len + 7) // 8
mpi = 0
i = -4
for i in range(0, to_process - 3, 4):
mpi <<= 32
mpi += get_int4(data, offset + i)
for j in range(i + 4, to_process):
mpi <<= 8
mpi += data[offset + j]
# Python 3.2 and later alternative:
#mpi = int.from_bytes(data[offset:offset + to_process], byteorder='big')
offset += to_process
return mpi, offset
def get_hex_data(data, offset, byte_count):
'''Pull the given number of bytes from data at offset and return as a
hex-encoded string.'''
key_data = data[offset:offset + byte_count]
if PY26:
key_data = buffer(key_data)
key_id = binascii.hexlify(key_data)
return key_id.upper()
def get_key_id(data, offset):
'''Pull eight bytes from data at offset and return as a 16-byte hex-encoded
string.'''
return get_hex_data(data, offset, 8)
def get_int_bytes(data):
'''Get the big-endian byte form of an integer or MPI.'''
hexval = '%X' % data
new_len = (len(hexval) + 1) // 2 * 2
hexval = hexval.zfill(new_len)
return binascii.unhexlify(hexval.encode('ascii'))
def pack_data(data):
'''Pack iterable of binary data into a bytestring if necessary.'''
if PY26:
return struct.pack('%dB' % len(data), *data)
return data
def same_key(key_a, key_b):
'''Comparison function for key ID or fingerprint strings, taking into
account varying length.'''
if len(key_a) == len(key_b):
return key_a == key_b
elif len(key_a) < len(key_b):
return key_b.endswith(key_a)
else:
return key_a.endswith(key_b)
|