Thanks for the info! I looked at the demos programs in the given link http://git.openssl.org/gitweb/?p=openssl.git;a=blob;f=demos/evp/aesgcm.c;h=324d8a55b1481c507c7754fa7f33c30a02bdb737;hb=HEAD .
I have a question in encrypt: ... /* Finalise: note get no output for GCM */ 63 <http://git.openssl.org/gitweb/?p=openssl.git;a=blob;f=demos/evp/aesgcm.c;h=324d8a55b1481c507c7754fa7f33c30a02bdb737;hb=HEAD#l63> EVP_EncryptFinal_ex(ctx, outbuf, &outlen); ... What does this mean? That we shouldn't expect any output from this call and/or that we should ignore it? Thanks! On Tue, May 27, 2014 at 12:33 AM, Jens Hiller <jens.hiller.c...@hotmail.de> wrote: > On 05/27/2014 09:00 AM, Anant Rao wrote: > > Hi, > > > > I have ciphertext encrypted in Java (using BouncyCastle - BC) with > > "AES/GCM/NoPadding" cipher. > > > > When I tried to decrypt it using OpenSSL in a 'c' program, the last call > > 'EVP_DecryptFinal_ex' fails. Somehow, ERR_print_errors_fp is not > > printing anything either. > > > > I do have the IV that is used in the Java's encrypt. However, I don't > > know where BC stores the tag in the ciphertext. I tried it at the > > beginning and the end of the ciphertext, but it didn't help. > > > > That is, I tried both of the following in the decrypt: > > > > |IV|TAG|Ciphertext > > > > |IV|Ciphertext|TAG > > Both didn't work. > > > > I tried both of the following as well with the same failure: > > EVP_aes_256_gcm > > EVP_aes_128_gcm > > > > I have run out of ideas what else to try. Any help would be greatly > > appreciated. > > Thanks in advance! > > > > > > Have a look at > https://www.openssl.org/docs/crypto/EVP_EncryptInit.html#GCM_Mode > and at the example in 'openssl/demos/evp/aesgcm.c' of the current master > branch (git://git.openssl.org/openssl.git). > > Regards > Jens > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org > -- *Anant* *Rao* Server Lead D / a...@noknok.com *Nok Nok Labs Inc.* 4151 Middlefield Road, Suite 200 Palo Alto, CA 94303 T +1 650 433 1300 i...@noknok.com *www.noknok.com* <http://www.noknok.com> <http://www.linkedin.com/company/nok-nok-labs> <http://www.twitter.com/noknoklabs> <https://plus.google.com/108217184383559859585> <http://www.facebook.com/NokNokLabs>
