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NAME

gss_wrap, gss_seal — Attach a cryptographic MIC and optionally encrypt a message

SYNOPSIS

#include <gssapi/gssapi.h>

OM_uint32
gss_wrap(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, int conf_req_flag, gss_qop_t qop_req, const gss_buffer_t input_message_buffer, int *conf_state, gss_buffer_t output_message_buffer);

OM_uint32
gss_seal(OM_uint32 *minor_status, gss_ctx_id_t context_handle, int conf_req_flag, gss_qop_t qop_req, gss_buffer_t input_message_buffer, int *conf_state, gss_buffer_t output_message_buffer);

DESCRIPTION

Attaches a cryptographic MIC and optionally encrypts the specified input_message. The output_message contains both the MIC and the message. The qop_req parameter allows a choice between several cryptographic algorithms, if supported by the chosen mechanism.

Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support the wrapping of zero-length messages.

The gss_seal() routine is an obsolete variant of 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.

PARAMETERS

minor_status

Mechanism specific status code.

context_handle

Identifies the context on which the message will be sent.

conf_req_flag

Non-zero

Both confidentiality and integrity services are requested.

Zero

Only integrity service is requested.

qop_req

Specifies required quality of protection. A mechanism-specific default may be requested by setting qop_req to GSS_C_QOP_DEFAULT. If an unsupported protection strength is requested, gss_wrap() will return a major_status of GSS_S_BAD_QOP.

input_message_buffer

Message to be protected.

conf_state

Non-zero

Confidentiality, data origin authentication and integrity services have been applied.

Zero

Integrity and data origin services only has been applied.

output_message_buffer

Buffer to receive protected message. Storage associated with this buffer must be freed by the application after use with a call to gss_release_buffer(3).

RETURN VALUES

GSS_S_COMPLETE

Successful completion.

GSS_S_CONTEXT_EXPIRED

The context has already expired

GSS_S_NO_CONTEXT

The context_handle parameter did not identify a valid context.

GSS_S_BAD_QOP

The specified QOP is not supported by the mechanism.

SEE ALSO

gss_release_buffer(3), gss_unwrap(3)

STANDARDS

RFC 2743

Generic Security Service Application Program Interface Version 2, Update 1

RFC 2744

Generic Security Service API Version 2 : C-bindings

HISTORY

The gss_wrap function first appeared in FreeBSD 7.0.

AUTHORS

John Wray, Iris Associates

COPYRIGHT

Copyright (C) The Internet Society (2000). All Rights Reserved.

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.

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