---
name: "Tspi_Context_LoadKeyByBlob"
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_Context_LoadKeyByBlob"
---

# Tspi\_Context\_LoadKeyByBlob(3)

load a key into the TPM using the key's blob.

TCG Software Stack Developers Reference

## NAME

Tspi\_Context\_LoadKeyByBlob - load a key into the TPM using the key's blob.

## 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_Context_LoadKeyByBlob(TSS_HCONTEXT hContext,     TSS_HKEY hUnwrappingKey,
                                      UINT32       ulBlobLength, BYTE*    rgbBlobData,
                                      TSS_HKEY*    phKey);
```

## DESCRIPTION

**Tspi\_Context\_LoadKeyByBlob**  creates a key based on the information gotten by the key blob. It then loads the key into the TPM, which unwraps the key blob by using the key associated with *hUnwrappingKey*. The key blob addressed by *hUnwrappingKey* must have been already loaded into the TPM. This function returns a handle to the created key object.

## PARAMETERS

### hContext

The *hContext* parameter is the handle of the context object.

### hUnwrappingKey

The *hUnwrappingKey* parameter is the handle of the key object which should be used to unwrap the key information associated with *rgbBlobData*.

### rgbBlobData

The *rgbBlobData* parameter is the wrapped key to load.

### phKey

The *phKey* parameter receives the handle of the key object representing the loaded key.

## RETURN CODES

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

- TSS\_E\_INVALID\_HANDLE

  *hContext* 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.

## CONFORMING TO

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

## SEE ALSO

[**Tspi\_Context\_LoadKeyByUUID**(3)](/Tspi_Context_LoadKeyByUUID/3.md), [**Tspi\_Policy\_SetSecret**(3)](/Tspi_Policy_SetSecret/3.md), [**Tspi\_GetPolicyObject**(3)](/Tspi_GetPolicyObject/3.md), [**Tspi\_Key\_CreateKey**(3)](/Tspi_Key_CreateKey/3.md), [**Tspi\_GetAttribUint32**(3)](/Tspi_GetAttribUint32/3.md).