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From: Stefan Claas <fgrsna.pynnf@vagrearg.eh>
Newsgroups: sci.crypt
Subject: Re: AES-256-GCM
Date: Fri, 4 Apr 2025 12:43:56 +0200
Organization: i2pn2 (i2pn.org)
Message-ID: <68ff9d583cf8c7299196622fa9acddaa12096257@i2pn2.org>
References: <a7ef4110589aeba52bc317beb3214d929b37e876@i2pn2.org> <1b3c9e45133d8cbf3b403e1724997e70f03b0bf6@i2pn2.org> <e30c0d0aad3b9cc7efd4ead82f5a72b4dde009b6@i2pn2.org> <f10b55b3943a8deb7389175eb3515c3789275dc7@i2pn2.org>
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Stefan Claas wrote:
> Stefan Claas wrote:
> > Stefan Claas wrote:
> > 
> > > Mmmmhhh, maybe my OpenSSL version is too old or I do something wrong. :-(
> > > 
> > > $ openssl enc -aes-256-gcm -d -in message.txt -out decrypted.txt  -K d33572d668cb7b8f5323bf160309c98d85a9668e26f6df9c667a50982de40123
> > > enc: AEAD ciphers not supported
> > > enc: Use -help for summary.
> > > 
> > > $ openssl version
> > > OpenSSL 3.0.15 3 Sep 2024 (Library: OpenSSL 3.0.15 3 Sep 2024)
> > 
> > LibreSSL can't handle it either. I guess no problem because who
> > uses them, when there are easier tools, like mine, available. ;-)
> 
> Ok. C version done, which uses OpenSSL library ... :-)

Works quite good with larger data. :-)

$ time openssl rand 100000000 > bin

real    0m4.266s
user    0m0.139s
sys     0m0.140s
$ time aes key < bin > bin2

real    0m2.998s
user    0m0.388s
sys     0m0.537s
$ time aes -d key < bin2 > bin3

real    0m2.579s
user    0m0.436s
sys     0m0.252s
$ time diff bin bin3

real    0m5.868s
user    0m0.055s
sys     0m0.212s

Regards
Stefan

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