gss_wrap()--Cryptographically Sign and Optionally Encrypt Message

 #include <gssapi.h>

 OM_uint32 gss_wrap (
     OM_uint32 *    minor_status,
     gss_ctx_id_t     context_handle,   
     int      conf_req,
     gss_qop_t      qop_req,
     gss_buffer_t   input_message,
     int *      conf_state,
     gss_buffer_t   output_message);  

The gss_wrap() function cryptographically signs and optionally encrypts a message. The token returned in the output_message parameter contains both the signature and the message. This token is then sent to the partner application that calls the gss_unwrap() routine to extract the original message and verify its authenticity.

Parameters

minor_status  (Output)

A status code from the security mechanism.

context_handle  (Input)

The context handle to be associated with the message when it is sent to the partner application.

conf_req  (Input)

The requested level of confidentiality and integrity services as follows:

TRUE	Both confidentiality and integrity services are requested.
FALSE	Only integrity services are requested.

qop_req  (Input)

The requested quality of protection for the message. Specify GSS_C_QOP_DEFAULT to use the default quality of protection as defined by the selected security mechanism.

The Kerberos security mechanism supports three quality of protection levels as follows (in decreasing order or speed). Specify GSS_KRB5_INTEG_C_QOP_DES_MD5 (or GSS_C_QOP_DEFAULT) for interoperability with other implementations of the Kerberos security mechanism.

GSS_KRB5_INTEG_C_QOP_MD5	Truncated MD5
GSS_KRB5_INTEG_C_QOP_DES_MD5	DES_MAC of an MD5 hash (default)
GSS_KRB5_INTEG_C_QOP_DES_MAC	Normal DES_MAC algorithm

input_message  (Input)

The message to be wrapped.

conf_state  (Output)

The level of confidentiality that was applied to the message. Specify NULL for this parameter if the confidentiality state is not needed. The return value is set as follows:

TRUE	Both confidentiality and integrity services were applied.
FALSE	Only integrity services were applied.

output_message  (Output)

The wrapped message. The buffer should be released when it is no longer needed by calling the gss_release_buffer() routine.

Return Value

The return value is one of the following status codes:

GSS_S_BAD_QOP

The quality of protection value is not valid.

GSS_S_COMPLETE

The routine completed successfully.

GSS_S_CONTEXT_EXPIRED

The context identifier provided by the caller has expired.

GSS_S_CREDENTIALS_EXPIRED

Credentials are no longer valid.

GSS_S_FAILURE

The routine failed for reasons that are not defined at the GSS level. The minor_status return parameter contains a mechanism-dependent error code describing the reason for the failure.

GSS_S_NO_CONTEXT

The context identifier provided by the caller does not refer to a valid security context.

Authorities

Error Messages

Usage Notes

1. If confidentiality is requested (the conf_req is true) but confidentiality services are not available for the security context, no error is returned and only integrity services are performed. The conf_state return parameter indicates whether or not the requested confidentiality services were performed.