How to get "EVP_PKEY *dhpkey" from NID_X9_62_prime256v1.

Kumar Mishra, Sanjeev Sanjeev.Kumar-Mishra at
Fri Aug 27 07:47:43 UTC 2021

Hi All,
I am upgrading the code from OpenSSL 1.0.1 to OpenSSL 3.0.
I am getting compilation errors for deprecated functions and structure like "EC_KEY_new_by_curve_name()" , "SSL_CTX_set_tmp_ecdh()" and "EC_KEY"......etc.

The code is like follows --
EC_KEY *ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
SSL_CTX_set_tmp_ecdh(mrmIcbPtr -> sslServerCtx, ecdh);

I got one replacement as

int SSL_CTX_set0_tmp_dh_pkey(SSL_CTX *ctx, EVP_PKEY *dhpkey);

Now, it will require "EVP_PKEY *dhpkey"
Now How to get  "EVP_PKEY *dhpkey" from NID_X9_62_prime256v1. ?
I am searching the work around of above code.....

Thanks in anticipation !
Sanjeev Kumar Mishra

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