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How to check NXP signature on NTAG413

Question asked by Daniele Ferro on Feb 1, 2019
Latest reply on Mar 1, 2019 by Daniele Ferro

Hello,

 

I'm trying to check the NTAG413 originality signature. Unfortunately the document “an260412 - AN11350 NTAG Originality Signature Validation (1.2)” concerns only the 32-byte signature validation, provided by other NXP tags.

I have the public key (57 bytes long), the tag’s UID (7 bytes long) and the signature (56 bytes long). I want to check the signature on a microchip based on easy-ecc library, so I should choose a ECC_CURVE (and hence the ECC_BYTES value, among 16, 24, 32, 48), but no value is compatible with my data to correct call this function:

 

int ecdsa_verify(const uint8_t p_publicKey[ECC_BYTES+1], const uint8_t p_hash[ECC_BYTES], const uint8_t p_signature[ECC_BYTES*2]);

 

Maybe the easy-ecc is not the proper way to check the signature ?

 

Regards,

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