Find the algorithm

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Job Description

I have a large list of plain text, password and encrypted output, I need the algorithm in ANSI C and preferably also VB.NET.

The plain text is a 3 to 5 byte constant string. It's not variable, I just don't know how many of the bytes are used
The password is always 4 bytes long
The encrypted output is always 4 bytes long

I can supply an essentially unlimited list of data, including the result for any password you like.

The estimated end date is a hope.