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FreeBSD 11.0 - man page for gss_unseal (freebsd section 3)

GSS_UNWRAP(3)							Programmer's Manual						     GSS_UNWRAP(3)

NAME
gss_unwrap, gss_unseal -- Convert a message previously protected by gss_wrap(3) back to a usable form
SYNOPSIS
#include <gssapi/gssapi.h> OM_uint32 gss_unwrap(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, const gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state); OM_uint32 gss_unseal(OM_uint32 *minor_status, gss_ctx_id_t context_handle, gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state);
DESCRIPTION
Converts a message previously protected by gss_wrap(3) back to a usable form, verifying the embedded MIC. The conf_state parameter indicates whether the message was encrypted; the qop_state parameter indicates the strength of protection that was used to provide the confidentiality and integrity services. Since some application-level protocols may wish to use tokens emitted by gss_wrap(3) to provide "secure framing", implementations must sup- port the wrapping and unwrapping of zero-length messages. The gss_unseal() routine is an obsolete variant of gss_unwrap(). 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 arrived. input_message_buffer Protected message. output_message_buffer Buffer to receive unwrapped message. Storage associated with this buffer must be freed by the application after use with a call to gss_release_buffer(3). conf_state Non-zero Confidentiality and integrity protection were used. Zero Integrity service only was used. Specify NULL if not required. qop_state Quality of protection provided. Specify NULL if not required.
RETURN VALUES
GSS_S_COMPLETE Successful completion. GSS_S_DEFECTIVE_TOKEN The token failed consistency checks. GSS_S_BAD_SIG The MIC was incorrect GSS_S_DUPLICATE_TOKEN The token was valid, and contained a correct MIC for the message, but it had already been processed. GSS_S_OLD_TOKEN The token was valid, and contained a correct MIC for the message, but it is too old to check for duplication. GSS_S_UNSEQ_TOKEN The token was valid, and contained a correct MIC for the message, but has been verified out of sequence; a later token has already been received. GSS_S_GAP_TOKEN The token was valid, and contained a correct MIC for the message, but has been verified out of sequence; an earlier expected token has not yet been received. GSS_S_CONTEXT_EXPIRED The context has already expired. GSS_S_NO_CONTEXT The context_handle parameter did not identify a valid context.
SEE ALSO
gss_release_buffer(3), gss_wrap(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_unwrap 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, pro- vided 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 organiza- tions, 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. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
BSD
January 26, 2010 BSD