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data/meterpreter/python/met_rsa.py
77 строк
2 KB
Spencer McIntyre
Apply autopep8 changes
31 окт 2022, 17:35
31 окт 2022, 17:35
189cc81
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import sys import math import random import binascii as ba import os from struct import unpack as u from struct import pack is2 = sys.version_info[0] < 3 def bt(b): if is2: return b return ord(b) def b2i(b): return int(ba.b2a_hex(b), 16) def i2b(i): h = '%x' % i if len(h) % 2 == 1: h = '0' + h if not is2: h = h.encode('utf-8') return ba.a2b_hex(h) def rs(a, o): if a[o] == bt(pack('B', 0x81)): return (u('B', a[o + 1])[0], 2 + o) elif a[o] == bt(pack('B', 0x82)): return (u('>H', a[o + 1:o + 3])[0], 3 + o) def ri(b, o): i, o = rs(b, o) return (b[o:o + i], o + i) def b2me(b): if b[0] != bt(pack('B', 0x30)): return (None, None) _, o = rs(b, 1) if b[o] != bt(pack('B', 2)): return (None, None) (m, o) = ri(b, o + 1) if b[o] != bt(pack('B', 2)): return (None, None) e = b[o + 2:] return (b2i(m), b2i(e)) def der2me(d): if d[0] != bt(pack('B', 0x30)): return (None, None) _, o = rs(d, 1) while o < len(d): if d[o] == bt(pack('B', 0x30)): o += u('B', d[o + 1:o + 2])[0] elif d[o] == bt(pack('B', 0x05)): o += 2 elif d[o] == bt(pack('B', 0x03)): _, o = rs(d, o + 1) return b2me(d[o + 1:]) else: return (None, None) def rsa_enc(der, msg): m, e = der2me(der) h = pack('BB', 0, 2) d = pack('B', 0) l = 256 - len(h) - len(msg) - len(d) p = os.urandom(512).replace(pack('B', 0), pack('')) return i2b(pow(b2i(h + p[:l] + d + msg), e, m))