mdw@git.distorted.org.uk Git - secnet/blob - mdw-test/mk-sshv1-rsapriv

   1 #! /usr/bin/python
   2
   3 from sys import argv
   4 import os as OS
   5 import catacomb as C
   6
   7 MAGIC = 'SSH PRIVATE KEY FILE FORMAT 1.1\n\0'
   8 keyring, tag, outfile = argv[1:]
   9 kf = C.KeyFile(keyring)
  10 k = kf[tag]
  11 kd = k.data
  12
  13 n, e = [kd[label].mp for label in ['n', 'e']]
  14 priv = kd['private']
  15 d, p, q, dp, dq, q_inv = \
  16   [priv[label].mp for label in ['d', 'p', 'q', 'd-mod-p', 'd-mod-q', 'q-inv']]
  17
  18 buf = C.WriteBuffer()
  19 buf.put(MAGIC)
  20 buf.putu8(0) # symmetric cipher type
  21 buf.putu32(0) # `reserved data'
  22 buf.putu32(n.nbits) # `not sure what this is'
  23 buf.putu16(n.nbits).put(n.storeb())
  24 buf.putu16(e.nbits).put(e.storeb())
  25 buf.putblk32(k.fulltag) # comment
  26 buf.putu16(1234).putu16(1234)# `next two pairs of characters are identical'
  27 buf.putu16(d.nbits).put(d.storeb())
  28 buf.putu16(q_inv.nbits).put(q_inv.storeb())
  29 buf.putu16(q.nbits).put(q.storeb())
  30 buf.putu16(p.nbits).put(p.storeb())
  31 outtmp = outfile + '.new'
  32 with open(outtmp, 'wb') as f: f.write(buf)
  33 OS.rename(outtmp, outfile)