From: W. Trevor King <wking@drexel.edu>
Date: Mon, 30 May 2011 19:44:23 +0000 (-0400)
Subject: Add openpgp2pem section to Monkeysphere post.
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=558e08445e89de13cdbd88ef30e176cd1b890044;p=blog.git

Add openpgp2pem section to Monkeysphere post.
---

diff --git a/posts/Monkeysphere.mdwn b/posts/Monkeysphere.mdwn
index 07e329b..a881f60 100644
--- a/posts/Monkeysphere.mdwn
+++ b/posts/Monkeysphere.mdwn
@@ -54,7 +54,7 @@ Maintaining a host SSH key
 Import a SSH key with
 
     $ monkeysphere-host import-key /path/to/secret/key ssh://server.example.net
-		ms: host key imported:
+    ms: host key imported:
     pub   2048R/01234567 2011-05-28
     uid                  ssh://server.example.net
     OpenPGP fingerprint: 0123456789ABCDF0123456789ABCDF0123456789
@@ -119,10 +119,8 @@ Validating HTTPS connections
 ----------------------------
 
 The OpenPGP side of this is similar to the SSH protocol, with public
-keys for `https://server.example.net` etc. stored in your keyring.  As
-far as I can tell, there is currently no way to print the key
-fingerprint for a given host (analagous to `sshfprs-for-userid`), but
-there's a neat little server `msva-perl` that checks your trust in a
+keys for `https://server.example.net` etc. stored in your keyring.
+There's a neat little server `msva-perl` that checks your trust in a
 particular (*context*, *peer*, *PKC type*, *peer type*, *PKC data*)
 tuple (e.g. (`https`, `server.example.net`, `x509pem`, `server`,
 `cert.pem`)), which you can do by hand (via `msva-query-agent`).
@@ -130,6 +128,23 @@ There's also a XUL extension (works in Firefox and related tools) that
 uses the `msva` server to validate HTTPS connections automatically.
 Nice.
 
+If you don't want to use the the validation agent and plugin, you can
+verify keys by hand using `openpgp2pem` (this patch has not yet been
+accepted upstream).
+
+    $ gpg --export 'https://server.example.net' | openpgp2pem | openssl rsa -in /dev/stdin -pubin -text
+    Public-Key: (1024 bit)
+    Modulus:
+        00:ae:0b:...
+    Exponent: 65537 (0x10001)
+    writing RSA key
+    -----BEGIN PUBLIC KEY-----
+    ...
+    -----END PUBLIC KEY-----
+
+Compare the modulus and exponent with those listed for the public key
+offered by the target server.
+
 Packages
 --------