from nx_crypto_ecdh.h:109
UINT _nx_crypto_ecdh_compute_secret(NX_CRYPTO_ECDH *ecdh_ptr,
UCHAR *share_secret_key_ptr,
ULONG share_secret_key_len_ptr,
ULONG *actual_share_secret_key_len,
UCHAR *remote_public_key,
ULONG remote_public_key_len,
HN_UBASE *scratch_buf_ptr);
Implemented in nx_crypto_ecdh.c:363