---
name: "Tspi_ChangeAuthAsym"
section: "3"
platform: "linux"
package: "libtspi-dev"
version: "0.3.15-0.4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Tspi_ChangeAuthAsym"
---

# Tspi\_ChangeAuthAsym(3)

change the authorization data of an entity using asymmetric change protocol.

## NAME

Tspi\_ChangeAuthAsym - change the authorization data of an entity using asymmetric change protocol.

## SYNOPSIS

**#include \<tss/platform.h\>**
 **#include \<tss/tcpa\_defines.h\>**
 **#include \<tss/tcpa\_typedef.h\>**
 **#include \<tss/tcpa\_struct.h\>**
 **#include \<tss/tss\_typedef.h\>**
 **#include \<tss/tss\_structs.h\>**
 **#include \<tss/tspi.h\>**
 **TSS\_RESULT Tspi\_ChangeAuthAsym(TSS\_HOBJECT** *hObjectToChange***, TSS\_HOBJECT** *hParentObject***,**
                                **TSS\_HKEY**    *hIdentKey***,       TSS\_HPOLICY** *hNewPolicy***);**

## DESCRIPTION

**Tspi\_ChangeAuthAsym**  changes the authorization data (secret) of an entity (object) utilizing the asymmetric change protocol and assigns the object to the policy object. All classes using secrets provide this method for changing their authorization data.
 This method changes the authorization data of an object ensuring that the parent of the object does not get knowledge of the new secret.

## PARAMETERS

### hObjectToChange

Handle of the object the authorization data should be changed.

### hParentObject

Handle of the parent object wrapping the object addressed by *hObjectToChange*.

### hIdentKey

Handle of the identity key object required to proof the internally created temporary key.

### hNewPolicy

Handle of the policy object providing the new authorization data.

## RETURN CODES

**Tspi\_ChangeAuthAsym** returns TSS\_SUCCESS on success, otherwise one of the following values are returned:
 TSS\_E\_INVALID\_HANDLE - Either *hObjectToChange*, *hParentObject*, or *hIdentKey* is an invalid handle.
 TSS\_E\_INTERNAL\_ERROR - An error occurred internal to the TSS.

## CONFORMING TO

**Tspi\_ChangeAuthAsym** conforms to the Trusted Computing Group Software Specification version 1.1 Golden

## SEE ALSO

[**Tspi\_ChangeAuth**(3)](/Tspi_ChangeAuth/3.md).