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compute_key 

        # OpenSSL::PKey::DH.compute_key

(from ruby core)
### Implementation from DH
---
    dh.compute_key(pub_bn) -> string

---

Returns a String containing a shared secret computed from the other
party's public value.

This method is provided for backwards compatibility, and calls #derive
internally.

### Parameters
*   *pub_bn* is a OpenSSL::BN, **not** the DH instance returned by
    DH#public_key as that contains the DH parameters only.

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