How to use 'cryptography API: next generation (CNG)'

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cryptography

I am coding in PowerBuilder and actually have it working. My question is about the salt which is called the Initialization Vector by CNG.

I am taking the password which can be any length and generating a SHA-256 hash. I am using the hash as the Secret Key and the Initialization Vector. I then call BCryptGenerateSymmetricKey passing the 256-bit Secret Key and then call BCryptEncrypt passing the same as the Initialization Vector.

There aren't very many good examples that I can find. My main concern is that if a PowerBuilder app had to exchange encrypted data with an app developed in a different language, it isn't going to work unless the key and salt are the same.

Any tips on how encryption is done in other languages would be appreciated.

What I have tried:

See problem description, I pass hashed password as Secret Key and IV.