---
title: "gss_unwrap(_:_:_:_:_:_:)"
framework: GSS
role: symbol
role_heading: Function
platforms: [iOS 5.0+, iPadOS 5.0+, Mac Catalyst 13.1+, macOS 10.7+, visionOS 1.0+]
path: "gss/gss_unwrap(_:_:_:_:_:_:)"
---

# gss_unwrap(_:_:_:_:_:_:)

Returns the original version of a secure message by optionally decrypting it and then extracting and verifying the attached MIC.

## Declaration

```swift
func gss_unwrap(_ minor_status: UnsafeMutablePointer<OM_uint32>, _ context_handle: gss_ctx_id_t, _ input_message_buffer: gss_buffer_t, _ output_message_buffer: gss_buffer_t, _ conf_state: UnsafeMutablePointer<Int32>?, _ qop_state: UnsafeMutablePointer<gss_qop_t>?) -> OM_uint32
```

## Parameters

- `minor_status`: A pointer to the secondary status result that provides additional information in case of failure.
- `context_handle`: The context used to send the message.
- `input_message_buffer`: A buffer containing the protected message from the peer.
- `output_message_buffer`: A buffer the function uses to return the unwrapped message. Release the buffer using a call to doc://com.apple.gss/documentation/GSS/gss_release_buffer(_:_:) when you are done with it.
- `conf_state`: A pointer the function uses to indicate what protection had been applied to the message. A value of zero indicates only integrity checking. A non-zero value indicates both integrity checking and confidentiality. Pass NULL to ignore this output.
- `qop_state`: A pointer the function uses to return the quality of protection setting. See Quality of Protection Constants in doc://com.apple.gss/documentation/GSS/object-identifiers for valid values. Pass NULL to ignore this output.

## Return Value

Return Value A status code set to GSS_S_COMPLETE on success. See Function Status for a complete enumeration of status outputs.

## See Also

### Message Wrapping and Verification

- [gss_get_mic(_:_:_:_:_:)](gss/gss_get_mic(_:_:_:_:_:).md)
- [gss_verify_mic(_:_:_:_:_:)](gss/gss_verify_mic(_:_:_:_:_:).md)
- [gss_wrap(_:_:_:_:_:_:_:)](gss/gss_wrap(_:_:_:_:_:_:_:).md)
- [gss_sign(_:_:_:_:_:)](gss/gss_sign(_:_:_:_:_:).md)
- [gss_verify(_:_:_:_:_:)](gss/gss_verify(_:_:_:_:_:).md)
- [gss_seal(_:_:_:_:_:_:_:)](gss/gss_seal(_:_:_:_:_:_:_:).md)
- [gss_unseal(_:_:_:_:_:_:)](gss/gss_unseal(_:_:_:_:_:_:).md)