replicating openssl encryption in .NET?

Question

I'm wondering if anyone can suggest a good way to replicate the following openssl command line in .NET? I'm not looking for someone to write the code, just suggest the best method to use. I have RijndaelManaged working doing AES 256 CBC mode and can base64 encode it, etc. But, I'm unclear on how openssl is generating\using "salt" - is the salt a part of the result base64 encoded output?

$ echo 1234 | openssl enc -aes-256-cbc -a -salt -pass pass:<passphrase>

Any pointers to decent documentation on openssl commandline? (I don't see salt or aes-256-cbc on http://openssl.org/docs/apps/openssl.html )

EDIT:

OK, found the documentation for openssl enc at http://openssl.org/docs/apps/enc.html# - just trying to grok it. :)

EDIT2:

I think this is closer to what I am needing ( http://deusty.blogspot.com/2009/04/decrypting-openssl-aes-files-in-c.html )

score 1 · Answer 1 · edited May 23 '17 at 12:04

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The answers to openssl des3 decrypting in java should get you going.

edited May 23 '17 at 12:04

Community

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answered Mar 25 '11 at 00:41

Jumbogram

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Thanks, this was helpful, but would be nice to find an AES example. – mutex Mar 27 '11 at 20:25

score 1 · Accepted Answer · answered Mar 25 '11 at 01:12

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OpenSSL is basically some dlls with and executable over them. There is an old project OpenSSL.Net on sourceforge to bind them in C# maybe you could start there.

answered Mar 25 '11 at 01:12

Julien Roncaglia

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upvote since this is a decent option. I would prefer to stick to using the .net framework crypto classes though. – mutex Mar 27 '11 at 20:26
Actually I'm going to mark this as answer, since it probably would have been the sensible way to do it. Finally got it working how I wanted though :) http://stackoverflow.com/questions/5452422/openssl-using-only-net-classes/5454692#5454692 – mutex Mar 28 '11 at 04:30

score 0 · Answer 3 · answered Feb 16 '19 at 17:14

You can also achieve this with OpenSSL Library for .NET

DidiSoft.OpenSsl.OpenSslCipher cipher = new DidiSoft.OpenSsl.OpenSslCipher();
bool isBase64 = true;
string encrypted = cipher.EncryptString(CipherAlgorithm.Aes_256_Cfb, "1234", 
                                        "<passphrase>", isBase64);

Disclaimer: I work for DidiSoft

replicating openssl encryption in .NET?

3 Answers3