Hi !

I have disabled LTC HW accelerator on K82 MCU for be able to have P-521 cryptography.

All memory constrains removed also. mbedTLS version 2.6.0.

But ECDSA-secp521r1 test fail at verification phase.

Other remains curves pass both tests.

MBEDTLS_ECP_WINDOW_SIZE - 7

MBEDTLS_ECP_FIXED_POINT_OPTIM - 1

MBEDTLS_MPI_MAX_SIZE - 1024

MBEDTLS_MPI_WINDOW_SIZE - 7

MBEDTLS_SSL_MAX_CONTENT_LEN - 16384

ECDSA-secp521r1 : 0.15 sign/s 15168 heap bytes

ECDSA-brainpoolP512r1 : 0.17 sign/s 14664 heap bytes

ECDSA-secp192r1 : 0.50 sign/s 4816 heap bytes

ECDSA-secp521r1 : FAILED: -0x4e00

ECDSA-brainpoolP512r1 : 0.08 verify/s 14852 heap bytes

ECDSA-secp192r1 : 0.25 verify/s 5176 heap bytes

Can it be something what is known already ?

Or some extra configuration should be done.

Regards,

Eugene