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.\" -*- nroff -*-
.\"
.\" Copyright (c) 2005 Doug Rabson
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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.\" HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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.\" The following commands are required for all man pages.
.Dd November 12, 2005
.Os
.Dt GSS_WRAP 3 PRM
.Sh NAME
.Nm gss_wrap ,
.Nm gss_seal
.Nd Attach a cryptographic MIC and optionally encrypt a message
.\" This next command is for sections 2 and 3 only.
.\" .Sh LIBRARY
.Sh SYNOPSIS
.In "gssapi/gssapi.h"
.Ft OM_uint32
.Fo gss_wrap
.Fa "OM_uint32 *minor_status"
.Fa "const gss_ctx_id_t context_handle"
.Fa "int conf_req_flag"
.Fa "gss_qop_t qop_req"
.Fa "const gss_buffer_t input_message_buffer"
.Fa "int *conf_state"
.Fa "gss_buffer_t output_message_buffer"
.Fc
.Ft OM_uint32
.Fo gss_seal
.Fa "OM_uint32 *minor_status"
.Fa "gss_ctx_id_t context_handle"
.Fa "int conf_req_flag"
.Fa "gss_qop_t qop_req"
.Fa "gss_buffer_t input_message_buffer"
.Fa "int *conf_state"
.Fa "gss_buffer_t output_message_buffer"
.Fc
.Sh DESCRIPTION
Attaches a cryptographic MIC and optionally encrypts the specified
.Dv input_message .
The output_message contains both the MIC and the message.
The
.Dv qop_req
parameter allows a choice between several cryptographic algorithms,
if supported by the chosen mechanism.
.Pp
Since some application-level protocols may wish to use tokens emitted
by
.Fn gss_wrap
to provide "secure framing",
implementations must support the wrapping of zero-length messages.
.Pp
The
.Fn gss_seal
routine is an obsolete variant of
.Fn gss_wrap .
It is
provided for backwards
compatibility with applications using the GSS-API V1 interface.
A distinct entrypoint (as opposed to #define) is provided,
both to allow GSS-API V1 applications to link
and to retain the slight parameter type differences between the
obsolete versions of this routine and its current form.
.Sh PARAMETERS
.Bl -tag
.It minor_status
Mechanism specific status code.
.It context_handle
Identifies the context on which the message will be sent.
.It conf_req_flag
.Bl -tag -width "Non-zero"
.It Non-zero
Both confidentiality and integrity services are requested.
.It Zero
Only integrity service is requested.
.El
.It qop_req
Specifies required quality of protection.
A mechanism-specific default may be requested by setting qop_req to
.Dv GSS_C_QOP_DEFAULT .
If an unsupported protection strength is requested,
.Fn gss_wrap
will return a major_status of
.Dv GSS_S_BAD_QOP .
.It input_message_buffer
Message to be protected.
.It conf_state
.Bl -tag -width "Non-zero"
.It Non-zero
Confidentiality, data origin authentication and integrity services
have been applied.
.It Zero
Integrity and data origin services only has been applied.
.El
.It output_message_buffer
Buffer to receive protected message.
Storage associated with this buffer must
be freed by the application after use use
with a call to
.Xr gss_release_buffer 3 .
.El
.Sh RETURN VALUES
.Bl -tag
.It GSS_S_COMPLETE
Successful completion.
.It GSS_S_CONTEXT_EXPIRED
The context has already expired
.It GSS_S_NO_CONTEXT
The context_handle parameter did not identify a valid context.
.It GSS_S_BAD_QOP
The specified QOP is not supported by the mechanism.
.El
.Sh SEE ALSO
.Xr gss_unwrap 3 ,
.Xr gss_release_buffer 3
.Sh STANDARDS
.Bl -tag
.It RFC 2743
Generic Security Service Application Program Interface Version 2, Update 1
.It RFC 2744
Generic Security Service API Version 2 : C-bindings
.\" .Sh HISTORY
.Sh HISTORY
The
.Nm
manual page example first appeared in
.Fx 7.0 .
.Sh AUTHORS
John Wray, Iris Associates