[openssl-users] I need help to implement triple des algorithm with openssl

Fernando A soporteallpurpose at gmail.com
Fri Jun 15 19:41:08 UTC 2018

Thank you Matt!,
yes it odd, the component in C# is from a third an we don't know C#, we
think that for a moment we could replace that using openssl command line.

Could show me how pass a key to the openssl?

Thank you!

El vie., 15 de jun. de 2018 a la(s) 10:53, Matt Caswell (matt at openssl.org)

> On 15/06/18 14:34, Fernando A wrote:
> > Hi all,
> >
> > I am not an expert with openssl and I need replace a component in c#
> > that run algorithm Triple DES.
> > I tried in the command line something like this
> > "openssl enc -des-ede3 -k 1234567890123456ABCDEFGH -in test.txt -out
> > test.enc"
> >
> > but the result that I obtain is diferent of result launched by the c#
> > component.
> > Of course the passphrase is the same, and always file test.enc contain a
> > phrase
> > that start with "Salted__..." indifferent of the contain of file
> test.txt.
> > some idea?
> > thanks in advance!
> Is your c# component using a passphrase or a key? If a passphrase, how
> does it generate the key from that passphrase?
> By default the OpenSSL enc command uses its own key derivation function
> (KDF) to generate a key from a passphrase. That KDF uses a random salt
> value which it prepends to the beginning of the file. If the KDF in C#
> is different (which it almost certainly is), and it doesn't use the same
> file format as OpenSSL uses (which it almost certainly doesn't) then
> you're going to get different results.
> You can alternatively pass a key rather than a passphrase to the OpenSSL
> command line.
> It seems odd that you are using the command line to replace a c#
> component, rather than using the OpenSSL APIs.
> Matt
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