Under this section, add the following settings to enable and configure the key size validation. 

When defined under different configuration sections, the key-size set of parameters has the following precedence, from least to greatest (the last listed variables override all other variables).

1. key-size under authorities
2. key-size under managed-cas.<ca>
3. key-size under profiles.<profile>

min-ecc

The minimum key size for elliptic curve keys, as a number of bytes.

min-rsa

The minimum key size for RSA keys, as a number of bytes.

reject

The performed action when the CA key does not meet the min-ecc or min-rsa size requirements.