---
name: "Tspi_Hash_VerifySignature"
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_VerifySignature"
---

# Tspi\_Hash\_VerifySignature(3)

verify the hash value with a given signature

TCG Software Stack Developer's Reference

## NAME

Tspi\_Hash\_VerifySignature - verify the hash value with a given signature

## 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_VerifySignature(TSS_HHASH hHash,             TSS_HKEY hKey,
                                     UINT32    ulSignatureLength, BYTE*    rgbSignature);
```

## DESCRIPTION

**Tspi\_Hash\_VerifySignature** verifies the hash value of a given hash object with a given signature. In order to use this command, one must have a hash and a signature of the hash that one is trying to verify. The public key which corresponds to the private key used to sign the hash is also needed.

## PARAMETERS

### hHash

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

### hKey

Handle to the key object which should be used for the signature verification.

### ulSignatureLength

The length of the signature data provided at the parameter *rgbSignature*.

### rgbSignature

A pointer to the signature data.

## RETURN CODES

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

- TSS\_E\_INVALID\_HANDLE

  *hKey* 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.

- TSS\_E\_INVALID\_SIGSCHEME

  Invalid signature scheme.

## CONFORMING TO

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

## SEE ALSO

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