---
name: "Tspi_Hash_UpdateHashValue"
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_Hash_UpdateHashValue"
---

# Tspi\_Hash\_UpdateHashValue(3)

update the hash value of a hash object

TCG Software Stack Developer's Reference

## NAME

Tspi\_Hash\_UpdateHashValue - update the hash value of a hash object

## 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_Hash_UpdateHashValue(TSS_HHASH hHash, UINT32 ulDataLength, BYTE* rgbData);
```

## DESCRIPTION

**Tspi\_Hash\_UpdateHashValue** updates the hash value of a hash object with new information. If the object was created with the flag TSS\_HASH\_OTHER, then this method will return an error. **The** **object can't be modified after Tspi\_Hash\_SetHashValue,** **Tspi\_Hash\_GetHashValue, Tspi\_Hash\_Sign, or Tspi\_Hash\_VerifySignature** **have been called on it.**

## PARAMETERS

### hHash

The handle to the hash object instance whose hash value should be signed.

### ulDataLength

Indicates the length of the data provided at the parameter *rgbData*.

### rgbData

A pointer to the data.

## RETURN CODES

**Tspi\_Hash\_UpdateHashValue** returns TSS\_SUCCESS on success, otherwise one of the following values is returned:

- TSS\_E\_INVALID\_HANDLE

  *hHash* is not a valid handle.

- TSS\_E\_INTERNAL\_ERROR

  An internal SW error has been detected.

- TSS\_E\_BAD\_PARAMETER

  One or more parameters is bad.

- TSS\_E\_HASH\_INVALID\_LENGTH

  Hash length is inconsistent with hash algorithm.

- TSS\_E\_HASH\_NO\_DATA

  Hash object has no internal hash value.

## CONFORMING TO

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

## SEE ALSO

[**Tspi\_Hash\_GetHashValue**(3)](/Tspi_Hash_GetHashValue/3.md), [**Tspi\_Hash\_Sign**(3)](/Tspi_Hash_Sign/3.md), [**Tspi\_Hash\_SetHashValue**(3)](/Tspi_Hash_SetHashValue/3.md), [**Tspi\_Hash\_VerifySignature**(3)](/Tspi_Hash_VerifySignature/3.md).