On Mon, Feb 09, 2015, Sec_Aficionado wrote: > Hello, > > 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. > AES GCM is not supported by the 'enc' utility. More recent versions of OpenSSL throw out and error message if you try to use it from the command line. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org
