Re: [IBMiOSS] C# decryption port to Power i

[Jack Woehr <jwoehr@xxxxxxxxxxxxxxxxxxxxxxxx>]

If IBM i'ers who care take action like the rest of the open source
community and port C# to PASE, there will be C# on IBM i PASE.

C# runtime is open source: https://github.com/dotnet

On Tue, Nov 14, 2017 at 11:05 AM, Justin Taylor <JUSTIN@xxxxxxxxxxxxx>
wrote:

> IBMiOSS doesn't support C#.  It might be theoretically possible to run C#,
> but probably not practical.
>
> My advice would be:
> 1. What encryption does it use?
> 2. How can you do that encryption on IBMi 7.1?
>
>
>
>
> -----Original Message-----
> From: Dan [mailto:dan27649@xxxxxxxxx]
> Sent: Monday, November 13, 2017 4:20 PM
> To: IBMi Open Source Roundtable <opensource@xxxxxxxxxxxx>
> Subject: [IBMiOSS] C# decryption port to Power i
>
> I have a requirement to accept an encrypted credit card number from our
> Oracle system, decrypt it on our Power i so that we can then send it to
> Curbstone for payment processing.
>
> Our Oracle developer gave me the following C# code that will decrypt the
> data.
>
>
> private byte[] SALT = Encoding.Unicode.GetBytes("<32 bytes removed>";
>
>
>
> public string decryptText(string encText, string password)
>
> {
>
>     byte[] cipher = Convert.FromBase64String(encText);
>     Rfc2898DeriveBytes bytes = new Rfc2898DeriveBytes(password, SALT),
> 1000);    Rijndael rijndael = Rijndael.Create();
>
>     rijndael.BlockSize = 256;
>
>     rijndael.Key = bytes.GetBytes(32);
>
>     rijndael.IV = bytes.GetBytes(32);
>     MemoryStream memoryStream = new MemoryStream();
>
>     CryptoStream chiperStream = new CryptoStream(memoryStream,
> rijndael.CreateDecryptor(), CryptoStreamMode.Write);
>
>    chiperStream.Write(cipher, 0, cipher.Length);
>
>    chiperStream.Close();
>
>
>
>     return Encoding.Unicode.GetString(memoryStream.ToArray());
>
> }
>
> We are on v7r1, cume C6320710 (level 16320), TR level 11.  SF99123 level 3.
> Display Installed Licensed Programs does not show 5733OPS installed; the
> only 5733* LPs I see are:
> Licensed  Installed
> Program   Status       Description
> 5733SC1   *INSTALLED   IBM Portable Utilities for i
> 5733SC1   *INSTALLED   OpenSSH, OpenSSL, zlib
> 5733W60   *INSTALLED   WebSphere Application Server for OS/400 V6
> 5733W60   *INSTALLED   WebSphere Application Server V6 Express
>
> Is C# supported in the IBM OSS?  If not, is the code posted above easily
> portable to a language that IBM OSS does support?  I guess I'll ask the
> stupid question, is this something that could be accomplished in RPG, using
> QC2LE functions or any other system supplied functions?  FYI, we are moving
> to v7r3 eventually, but this solution is required long before that will
> happen.
>
> - Dan
>
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