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Patrick R. Dunbar wrote:
> Also is there any way to check if a gpg encrypted file is encrypted
> using AES?
Henry had some interesting answers, and his program does work for many
cases, but it's slightly ad-hoc and there are many valid possibilities
it might not work for. You really need a program that knows how to read
the whole format. Last I checked, gpg does this nicely. ;-)
Try:
gpg --list-packets --list-only enc.gpg
- --list-packets describes what's in the file. --list-only prevents it
trying to decrypt just to look at what's inside; you don't need to
decrypt to find out the cipher algo.
Here's what the output looked like for something encrypted with CAST5:
:symkey enc packet: version 4, cipher 3, s2k 3, hash 2
salt aa0896216033e71c, count 96
gpg: CAST5 encrypted data
:encrypted data packet:
length: unknown
gpg: encrypted with 1 passphrase
And with TWOFISH:
:symkey enc packet: version 4, cipher 10, s2k 3, hash 2
salt 24fa7e952bcca00e, count 96
gpg: TWOFISH encrypted data
:encrypted data packet:
length: unknown
mdc_method: 2
gpg: encrypted with 1 passphrase
And with AES:
:symkey enc packet: version 4, cipher 7, s2k 3, hash 2
salt 9182cb227dcb6d3b, count 96
gpg: AES encrypted data
:encrypted data packet:
length: unknown
mdc_method: 2
gpg: encrypted with 1 passphrase
The numbers after "cipher" (3 for CAST5, 10 for TWOFISH, 7 for AES-128)
correspond to whatever the most current variant of RFC 2440 is (bis 18,
http://www.ietf.org/internet-drafts/draft-ietf-openpgp-rfc2440bis-18.txt
, is set to expire on the 11th of this month), or, more specifically,
GPG's interpretation thereof.
Hope that helps
PSM
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