<can we convert keys in BIGNUM format to EVP_PKEY format>

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<can we convert keys in BIGNUM format to EVP_PKEY format>

Narayana, Sunil Kumar

Dear Openssl team,

                While migrating from 1.0.2 to 3.0 we are stuck in replacing DH_compute_key() with its equivalent EVP_PKEY_derive()

The input we have is of type (BIGNUM  *bn_peer_publicKey / bn_privateKey). But the example showed in the man page

EVP_PKEY_derive_init …  requires the peer_publickey/privatekey  in EVP_PKEY format. we are not finding the way to convert the BIGNUM keys to EVP_PKEY. 

Please suggest the required steps to achieve the compute key functionality using the existing BIGNUM private and peer public keys




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