from nx_crypto_ecdh.h:71
typedef struct NX_CRYPTO_ECDH_STRUCT
{
UINT nx_crypto_ecdh_key_size;
HN_UBASE nx_crypto_ecdh_private_key_buffer[NX_CRYPTO_ECDH_MAX_KEY_SIZE >> HN_SIZE_SHIFT];
NX_CRYPTO_EC *nx_crypto_ecdh_curve;
HN_UBASE nx_crypto_ecdh_scratch_buffer[NX_CRYPTO_ECDH_SCRATCH_BUFFER_SIZE >> HN_SIZE_SHIFT];
} NX_CRYPTO_ECDH;