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Date: Sat, 9 Nov 2013 01:50:13 +0100
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: gpg requires more test vectors

dhiru, magnum, all:
Let's talk about this:
https://github.com/magnumripper/JohnTheRipper/issues/331

I've spent another evening on that, now I would apreciate any help.
GnuPG version 1.4.10 which I tested supports 10 symmetric crypto
algorithms and 7 hash functions used in s2k.
So we need at least 70 test vectors to cover all of them + some
variants of spec_simple, spec_salted.

Our current code does not handle the following algorithms:
3DES, TWOFISH, CAMELLIA128, CAMELLIA192, CAMELLIA256, SHA384, SHA224
That's something to add, or at least mention in release notes.

I have a problem with generating keys in batch mode, somehow such
generated key is not crackable so I am doing something wrong or we
have some bug. I tried to import such key to my keyring and then
export it with --export-secret-keys but the result remains the same.

I used the following script to generate keys:
#!/bin/bash
OUT=foo
# $1 - hashtype $2 - symmetric crypt type
function foogen(){
echo "%echo Generating a basic OpenPGP key" >$OUT
echo "Key-Type: RSA" >>$OUT
echo "Key-Length: 1024" >>$OUT
echo "Subkey-Type: RSA" >>$OUT
echo "Subkey-Length: 1024" >>$OUT
echo "Name-Real: JtR" >>$OUT
echo "Name-Comment: pass is $1-$2-openwall" >>$OUT
echo "Name-Email: $1-$2@....bar">> $OUT
echo "Expire-Date: 0">>$OUT
echo "Passphrase: $1-$2-openwall" >>$OUT
echo "%pubring $1-$2.pub" >>$OUT
echo "%secring $1-$2.sec" >>$OUT
echo "%commit" >>$OUT
echo "%echo done" >>$OUT
}
## add %no-protection for gpg2.1+

#for crypt in 3DES CAST5 BLOWFISH AES AES192 AES256 TWOFISH
CAMELLIA128 CAMELLIA192 CAMELLIA256;
#do
#  for hash in MD5 SHA1 RIPEMD160 SHA256 SHA384 SHA512 SHA224;
#  do
# echo "Generating $crypt-$hash..."
# foogen $hash $crypt
# gpg --batch --gen-key --armor --s2k-digest-algo $hash
--s2k-cipher-algo $crypt $OUT
#  done
#done
foogen MD5 AES256
gpg --batch --gen-key --armor --s2k-digest-algo MD5 --s2k-cipher-algo
AES256 $OUT

You can uncomment for's if you want to generate all the keys but this
might take a while.
I am including merged 70 test vectors, john loads only 25 of them as
expected, and cracks 0 of them.
Since gpg2john supports gecos field and password is embedded in
comment john should crack all loaded hashes.
I have no problems with keys generated by "gpg --gen-key" interactive
mode, but it would be crazy to do that manually.

I would apreciate any help in narrowing down the problem.

Thanks,
Lukas

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