Encryption/Decryption class



I need a class to encrypt and decrypt strings.

I need TWO VERSIONS of the class, one for Visual C++ and the other written in LotusScript.

What is LotusScript?


LotusScript is a Lotus Notes scripting language which is very similar to Visual Basic 6 – it’s 95% compatible with VB. Generally there are only minor modifications when moving classes from Visual Basic to LotusScript.

If you don’t have Lotus Notes then just write to class in Visual Basic (6) and I will test it in LotusScript.



I have already wasted several months with a developer who kept saying “almost ready” but could never finish. He did manage to finish the C++ class using Triple DES encryption but could not complete the VB class. So you already have his C++ code as a starting point – I will send this code to the winning bidder.

This time I decided to use PC1 encryption algorithm. You can download both C++ and Visual Basic source code from [url removed, login to view]

So you already have the encryption algorithms written in native code.

Your Job


Your job is in two parts.

1) Replace Triple DES in existing C++ class with PC1 algorithm.

2) Write the equivalent class in LotusScript/VB.

See the attached Word document for more information.



Must be completed by Novemeber 30th, 2007.



I will not be making any advanced payments. Payment will be made using escrow.

Future Work


I have a lot more projects coming soon. I would like to work with the same people on future projects.

What I need from you


1. Indicate that you can provide classes for both VC++ and LotusScript

2. Tell me about similar projects you’ve worked on.

3. Give me your best FIXED price bid.

If you have any questions then ask me.

Skills: C Programming, Visual Basic

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About the Employer:
( 19 reviews ) Erskineville, Australia

Project ID: #191050

9 freelancers are bidding on average $193 for this job


Hi, I think I can do it:-)! Best regards, netcoder:-)

$111 USD in 11 days
(56 Reviews)

Hello. Please check PMB. Thanks.

$140 USD in 1 day
(2 Reviews)

Hello Please see PM

$200 USD in 10 days
(6 Reviews)

Hi, I am Ahmad Jalil Qarshi, I have already worked on crytography using VC++6. I have developed a complete product named "Office Sign&Seal", this application digitally signs and seals the office documents. You ca More

$175 USD in 10 days
(10 Reviews)

I can do the job. I have experience in writing optimal alghoritms and I think I am fit for the task. I hope we will colaborate in the future. Best regards...

$165 USD in 6 days
(2 Reviews)

Hi, I understood your requirement clearly(c++/native VB class). You can check my product at where I have used VB code for encryption. As far as c++ I have 13 years of experience. Thanks Pras More

$300 USD in 30 days
(1 Review)

I will convert your c++ library into Visual Basic library. WIll debug it and will provide you ready to work library. Also both C++ and Visual Basic library will be compatible i.e if you encrypt with one library the oth More

$250 USD in 20 days
(0 Reviews)

Developing the Encryption algorithm is not a big deal. I have a solution for you. I can prepare a ActiveX component that takes the string the input and gives the encrypted string as output. Reverse action can also be d More

$275 USD in 30 days
(0 Reviews)

It will be done !!!

$120 USD in 10 days
(0 Reviews)