---
name: "Tspi_DecodeBER_TssBlob"
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_DecodeBER_TssBlob"
---

# Tspi\_DecodeBER\_TssBlob(3)

unwraps a BER-encoded TSS blob.

## NAME

Tspi\_DecodeBER\_TssBlob - unwraps a BER-encoded TSS blob.

## SYNOPSIS

```
#include <tss/tspi.h>

TSS_RESULT Tspi_DecodeBER_TssBlob(UINT32  berBlobSize, BYTE*   berBlob,
                                  UINT32* blobType,    UINT32* rawBlobSize,
                                  BYTE*   rawBlob);
```

## DESCRIPTION

**Tspi\_DecodeBER\_TssBlob**  is used to unwrap a BER-encoded blob in accordance with the ASN.1 data definitions in the Portable Data section of the Trusted Computing Group Software Stack Specification Version 1.2.

## PARAMETERS

### berBlobSize

Size of the BER-encoded blob.

### berBlob

Pointer to the BER-encoded blob.

### blobType

Pointer to the type of blob being unwrapped (refer to the TSS\_BLOB\_TYPE\_\* constants).

### rawBlobSize

Pointer to the size of the rawBlob buffer.  On input this parameter contains a pointer to the maximum size of the supplied rawBlob buffer.  On output this parameter contains a pointer to the actual size of the unwrapped blob.  On input, if this parameter points to a value of 0, then this function will return the size of the buffer required to hold the unwrapped blob without writing to the rawBlob buffer.

**Note:** The output data must be shorter than the BER-encoding, so berBlobSize is a useful upper limit on rawBlob buffer size.

### rawBlob

Pointer to a buffer to hold the unwrapped blob.

## RETURN CODES

**Tspi\_EncodeDER\_TssBlob** returns TSS\_SUCCESS on success, otherwise one of the following values are returned:

- TSS\_E\_BAD\_PARAMETER

  - TSS\_E\_INTERNAL\_ERROR - An error occurred internal to the TSS.

  ## CONFORMING TO

**Tspi\_DecodeBER\_TssBlob** conforms to the Trusted Computing Group Software Specification Version 1.2

## SEE ALSO

[**Tspi\_DecodeBER\_TssBlob**(3)](/Tspi_DecodeBER_TssBlob/3.md).