Is it possible to validate originality on the NT4H (using ECC signature from nt4h_rid_read_ecc_signature_pk) without configuring the Random ID as described in your API docs, as I can do this using the NXP SDK without a Random ID configured?
Yes. In case the Random ID is not configured, you should use the following function:
UFR_STATUS ReadECCSignatureExt(OUT uint8_t *lpucECCSignature,
VAR uint8_t *lpucECCSignatureLen,
OUT uint8_t *lpucUid,
VAR uint8_t *lpucUidLen,
VAR uint8_t *lpucDlogicCardType);
You can examine the code with https://www.d-logic.net/code/nfc-rfid-reader-sdk/ufr-examples-c-nt4h
Function void check_signature(void)
If the UID length is 4, then Random ID is activated and you should use function nt4h_rid_read_ecc_signature, if UID length is 7, then this is a regular UID and you should use function ReadECCSignatureExt.