poly1305 implementation is not covering the latest RFC

[strmer]

The poly1305 implementation is only covering the obsolete RFC 7539 which got updated by RFC 8439

https://github.com/nrfconnect/sdk-nrfxlib/blob/main/crypto/nrf_oberon/include/ocrypto_poly1305.h#L21

Especially when using the poly1305 mac algorithm, the nrfxlib implementation is failing the official test vectors.

[strmer]

See attached a test application to verify the test vectors with oberon and/or mbedtls

0246.test.zip

[Vidar Berg]

Thanks for the report and also for providing us with a test sample! I have forwarded this crypto team. Will keep you posted on the progress.

Best regards,

Vidar