Manual Pages  — GSS_WRAP

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

SYNOPSIS DESCRIPTION PARAMETERS RETURN VALUES SEE ALSO STANDARDS HISTORY AUTHORS COPYRIGHT

#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);

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.

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).

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.

RFC 2743
	Generic Security Service Application Program Interface Version 2, Update 1
RFC 2744
	Generic Security Service API Version 2 : C-bindings

The gss_wrap function first appeared in FreeBSD 7.0 .

John Wray, Iris Associates

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