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tmp_dh_callback 

        # OpenSSL::SSL::SSLContext.tmp_dh_callback

(from ruby core)
---

A callback invoked when DH parameters are required for ephemeral DH key
exchange.

The callback is invoked with the SSLSocket, a flag indicating the use of
an export cipher and the keylength required.

The callback must return an OpenSSL::PKey::DH instance of the correct
key length.

**Deprecated in version 3.0.** Use #tmp_dh= instead.

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