How to pass 128bit Hex number through pointer

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Hello,
I have a code for AES-CTR128 made in assembly. The code is linked to a DLL.
Now, I want to use this DLL for computation.
This is what will be on the input for DLL:
  • Key: 0x2b7e151628aed2a6abf7158809cf4f3c
  • Counter: 0xf0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
  • Plaintext: 0x6bc1bee22e409f96e93d7e117393172a
There are several questions I can't solve:
  • What data type to use to define all the above?
  • What libpointer data type to use to pass args to DLL?
Should I convert it to binary data type? If so, what kind of libpointer should I use?
I'm little bit confused about it.
Thanks for any advice!

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