• Kazu Yamamoto [email protected]
• August 16, 2010

pgpdump is a PGP packet visualizer which displays the packet format of OpenPGP (RFC 4880) and PGP version 2 (RFC 1991).

This fork of pgpdump has been extended to support exporting of unencrypted secret keys as SSH2 keys.

Here is an example:

% pgpdump data/sig1
Old: Marker Packet(tag 10)(3 bytes)
	String - ...
New: One-Pass Signature Packet(tag 4)(13 bytes)
	New version(3)
	Sig type - Signature of a binary document(0x00).
	Hash alg - SHA1(hash 2)
	Pub alg - DSA Digital Signature Algorithm(pub 17)
	Key ID - 0xA79778E247B63037
	Next packet - other than one pass signature
New: Signature Packet(tag 2)(63 bytes)
	Ver 3 - old
	Hash material(5 bytes):
		Sig type - Signature of a binary document(0x00).
		Creation time - Fri Nov 27 22:35:02 JST 1998
	Key ID - 0xA79778E247B63037
	Pub alg - DSA Digital Signature Algorithm(pub 17)
	Hash alg - SHA1(hash 2)
	Hash left 2 bytes - 8f 82
	DSA r(160 bits) - ...
	DSA s(157 bits) - ...
		-> hash(DSA q bits)

Take the following steps to install pgpdump.

% ./configure
% make
% su
# make install

Binaries are available for Mac OS X via Homebrew:

% brew install pgpdump

To know how to use pgpdump, type pgpdump -h.

Some examples are stored in the data directory. Also, you can visualize your pubring and secring.

This fork of pgpdump has been extended to support exporting of unencrypted secret keys as SSH2 keys.

Exporting is done by running pgpdump -e: % gpg --export-secret-key | pgpdump -e

This will write any secret keys or subkeys to the current working directory with a name of secret-key.x where x is the key number.

The official home page of pgpdump is:

• http://www.mew.org/~kazu/proj/pgpdump/

• pgpdump assumes that a compressed packet continues until the end of the specified file.

The test program is written in Haskell. I recommend to install Haskell Platform if you want to test. After that, please install necessary libraries:

% cabal install test-framework-hunit

Now you can execute the test program:

% cd data
% runghc test.hs