@Override
      public int getSymmetricKeySizeInBytes() {
        return parameters.getKeySizeBytes();
      }
ECIES encryption with HKDF-KEM (key encapsulation mechanism) and AEAD-DEM (data
encapsulation mechanism).

@since 1.0.0
java_src/src/main/java/com/google/crypto/tink/subtle/EciesAeadHkdfHybridEncrypt.java