create_dh_parameters(key_len)

Creates a shared secret for generating a DH private/public key pair and
returns a binary string that can be passed to
create_asymmetric_priv_key(). If secret generation fails, the result is
null.

Supported key_len values: The minimum and maximum key lengths in bits
are 1,024 and 10,000. These key-length limits are constraints imposed
by OpenSSL. Server administrators can impose additional limits on
maximum key length by setting environment variables. See
https://dev.mysql.com/doc/refman/5.7/en/enterprise-encryption-usage.html
.

For an example showing how to use the return value for generating
symmetric keys, see the description of asymmetric_derive().

URL: https://dev.mysql.com/doc/refman/5.7/en/enterprise-encryption-functions.html

