On Wed, Sep 26, 2012, Michel wrote:

> Hello,
> 
> I am using the the OpenSSL enc command to encrypt and decrypt a test file.
> When using AES-GCM mode, I can encrypt but cannot decrypt the result.
> Even though I succeed with all other modes.
> 
> Example is as follow :
> openssl enc -e -a -aes-128-gcm -nosalt -p -K
> 28C65581AABBBA0EBFC1DB5D5C614FEA -iv D2D136CA54FEB7C48C9E4358 -in
> test.dat -out enc.txt
> openssl enc -d -a -aes-128-gcm -nosalt -p -K
> 28C65581AABBBA0EBFC1DB5D5C614FEA -iv D2D136CA54FEB7C48C9E4358 -in
> enc.txt
> 
> Get a  : 'bad decrypt' output
> 
> Test file contains "bla bla bla bla bla bla bla bla bla'.
> Using OpenSSL 1.0.1c downloaded from source code, and compiled under
> Windows 7.
> 
> Also, if text file contains shorter data (< 16 bytes), I cannot
> encrypt in AES-XTS mode.
> (no output)
> 

Well technically those modes need special handling which wont necessarily work
with the 'enc' command at present.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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