private static Mac createMac(AesCmacKey key) throws GeneralSecurityException {
    validateParameters(key.getParameters());
    return PrfMac.create(key);
  }
This key manager generates new {@code AesCmacKey} keys and produces new instances of {@code
AesCmac}.
java_src/src/main/java/com/google/crypto/tink/mac/AesCmacKeyManager.java