Hello Henry,
Thank You for doing the test. Can you send me a public key? If you sent me a
public key, I could have the specific person encrypt sample data. I can then
purposely damage the file to see if you could reproduce the problem.
Thanks,
Gou
From: Henry Hertz Hobbit <[EMAIL PROTECTED]>
To: [email protected]
Subject: Re: gpg writes junk forever when decrypting
Date: Tue, 12 Dec 2006 11:57:10 -0700
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"Gou Yang" <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I think I've hit a bug in gpg. When I try and decrypt a corrupt
> pgp file, it looks like it is working but when it hits the
> corrupt part of the file, I see this error pop up:
>
> gpg: no valid OpenPGP data found.
> gpg: block_filter 0x80e8ac0: read error (size=11072,a->size=27456)
> gpg: block_filter 0x80e8a98: read error (size=14947,a->size=39523)
>
> When this error pops up, gpg goes out of control and starts
> appending junk to the decrypted file and never stops appending
> junk.
>
> I've let it sit up to 50GB before I killed gpg. The original file
> is only about 1GB but I wanted to see if it would ever stop. I've
> looked around but I didn't see anyone else who had this problem
> and resolved it.
>
> I could verify the signature prior to attempting to decrypt the
> file but the file isn't signed.
>
> Any suggestions? Any workaround? Anyone else have this problem?
I have tried this with the following combinations (my default
symmetric cipher is TWOFISH).
1. Encrypted symmetrically with TWOFISH, AES192, AES256, DES,
and BLOWFISH ciphers.
gpg -a -c --force-mdc --cipher-algo ${CIPHER} \
< ReadMe.txt > ReadMe.txt.asc
Twiddled two characters in ReadMe.txt.asc. Tried to decrypt with:
gpg -d < ReadMe.txt.asc > ReadMe.txt
Result: decryption stopped, output file size ZERO.
2. Encrypted and signed asymmetrically to myself with TWOFISH,
AES, and AES256 used for the symmetric ciphers.
gpg -a -r [EMAIL PROTECTED] -e -s \
< ReadMe.txt > ReadMe.txt.asc
Twiddled two characters in ReadMe.txt.asc. Tried to decrypt with:
gpg -d < ReadMe.txt.asc > ReadMe.txt
Result: decryption stopped, output file size ZERO.
3. On a file that is just a text file I get the following message:
gpg: no valid OpenPGP data found.
gpg: decrypt_message failed: eof
I have tried the use of several more symmetric ciphers and the
result is always the same. The instant I twiddle just two
characters in the encrypted [ / signed ] file I can't decrypt
and the output file size is ZERO. The failure given for the
asymmetric encryption is this for one of them:
gpg: CRC error; 2DC30B - 9AAB55
gpg: encrypted_mdc packet with unknown version 255
And the one I get for symmetric encrypion is this for one
of them:
gpg: CRC error; 404350 - 94DB54
gpg: encrypted_mdc packet with unknown version 255
In all cases if it failed, I end up with the output file
being of size ZERO. I am using 1.4.6 with keys that were
created with 1.4.2 (at least I believe that was what it was).
I suspect you have either a damaged file system or damaged
keys. But without more particulars I don't know what you are
looking at, because in all cases, I end up with a file size of
ZERO. That also happens when I delete quite a few characters.
HHH
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