On Wed, Nov 21, 2007, Lidia Fernndez wrote:
> I have to encrypt a file in c with openssl and then i have to decrypt in
> Java.
>
> In Java i use to decrypt the algorithm
>
> Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
>
> With OpenSSL i use
>
> openssl enc -a -des-ecb -in file -out file.enc -pass pass:abcdefgh
>
> but i have an error message in Java that say
>
> javax.crypto.BadPaddingException: Given final block not properly padded
>
>
> What padding does OpenSSL use??? How can i specify the padding??
>
OpenSSL uses standard block padding aka PKCS#5 padding.
Unless your Java code implements the necessary key derivation and file parsing
functions I suspect you problem may be that the salt value prepended to the
output stream. Ypu can avoid this using the -nosalt option and specfying the
key explicitly.
Though for any kind of security the use of unsalted keys along with DES in ECB
mode isn't much use.
Steve.
--
Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
OpenSSL project core developer and freelance consultant.
Funding needed! Details on homepage.
Homepage: http://www.drh-consultancy.demon.co.uk
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