[openssl-users] how to set temporary EC Diffie-Hellman parameters

[yordanos beyene]

Hello,

I appreciate if anyone can guide me how to set temporary EC Diffie-Hellman
parameters to be able to accept SSL connections from a client
using ephemeral ECDHE cipher.

I have an ssl based application that can accept SSL connections. I can
establish SSL connections from a client using RSA cipher ( eg AES128-SHA), but
when I use the ephemeral EDHE ciphers (eg ECDHE-RSA-AES128-SHA), the SSL
handshake fails.

I have been googling to understand the issue for several hours, and it
looks like I need to set temporary DH parameters.

I added the following code right after SSL initialization and creating
context in my application.
...
   EC_KEY *ecdh = EC_KEY_new_by_curve_name (NID_X9_62_prime256v1);
   ecdh = EC_KEY_new_by_curve_name (NID_X9_62_prime256v1);
   if (! ecdh)
       error ();
   if (1 != SSL_CTX_set_tmp_ecdh (session_cache_ctx, ecdh))
      return -ENOMEM;
   EC_KEY_free (ecdh);
...

But it is still not working. I am not familiar with this area, and
I greatly appreciate any help.

I am running OpenSSL 1.0.1

Jordan.
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