Also, make algorithm unsigned int in most places.
BUG=chrome-os-partner:701
TEST=existing RSA verification tests still pass
Review URL: http://codereview.chromium.org/3136017
This makes it much simpler to keep track of what we're doing.
vbutil_key can now wrap both .keyb and .pem keys. It figures out which is
which by trying both and just using the one that works.
vbutil_keyblock and vbutil_kernel now use .vbprivk files for signing.
replace debug() with VBDEBUG(()) in host-side sources, too.
rename PrivateKeyRead to PrivateKeyReadPem
Add real PrivateKeyRead and PrivateKeyWrite for .vbprivk files.
Review URL: http://codereview.chromium.org/2871033