if kbig == nil {
		return nil, fail("EC_KEY_get0_private_key")
	}
	pt := C._goboringcrypto_EC_POINT_new(group)
	if pt == nil {
		return nil, fail("EC_POINT_new")
	}
	if C._goboringcrypto_EC_POINT_mul(group, pt, kbig, nil, nil, nil) == 0 {
		C._goboringcrypto_EC_POINT_free(pt)
		return nil, fail("EC_POINT_mul")
	}
	bytes, err := pointBytesECDH(k.curve, group, pt)
	if err != nil {

void _goboringcrypto_EC_GROUP_free(GO_EC_GROUP*);

/*unchecked (opaque)*/ typedef struct GO_EC_POINT { char data[1]; } GO_EC_POINT;
GO_EC_POINT* _goboringcrypto_EC_POINT_new(const GO_EC_GROUP*);
int _goboringcrypto_EC_POINT_mul(const GO_EC_GROUP*, GO_EC_POINT*, const GO_BIGNUM*, const GO_EC_POINT*, const GO_BIGNUM*, GO_BN_CTX*);
void _goboringcrypto_EC_POINT_free(GO_EC_POINT*);