[openssl-users] AES-GCM failing from Command Line Interface

Sec_Aficionado secaficionado at gmail.com
Tue Feb 10 00:53:19 UTC 2015


I am trying to encrypt a short message using AES-256-GCM as mentioned in the subject.

My command is:
openssl enc -aes-256-gcm -p -in payload.txt -out enc.txt

I get prompted for password as expected.

The encryption goes well, and then I proceed to decrypt using:
openssl enc -d -aes-256-gcm -p -in enc.txt -out dec.txt

The program executes but I get a "bad decrypt" message. However, when I open dec.txt, it is the same as the original file payload.txt

My guess is that the problem is in the padding, but I have not been able to eliminate the error message, even setting the -nopad option and padding manually.

Can someone please explain to me why this might be happening?

I am running openSSL 1.0.1f (6 Jan 14) on an Ubuntu 14.04 LTS VM with current patches.

Thanks in advance for your help.

Sent from my mobile

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