Description of problem:
perl-CryptX doesn't provide perl(Crypt::PK::ECC).
This was disabled in order to unbundle libtomcrypt.
Version-Release number of selected component (if applicable):
I haven't investigated if changes to system libtomcrypt are still needed in order to enable ECC.
Unfortunately nothing has changed in this matter. Fedora's libtomcrypt does not support ECC because latest upstream's release (1.18.2) does not support ECC.
However, something has changed. libtomcrypt upstream merged the ECC support into "develop" branch in May 2018. That means that a next major release could support ECC.