Following the recent advisory about attacks on PGP keys based on

Following the recent advisory about attacks on PGP keys based on
tampering with the unencrypted public part of the key but leaving
the private part intact ... we are now ultra-paranoid about RSA key
files, and we check that the public part matches the private part
_before_ we generate any signatures with them.

git-svn-id: http://svn.tartarus.org/sgt/putty@1021 cda61777-01e9-0310-a592-d414129be87e