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

GSS_WRAP_SIZE_LIMIT(3)						Programmer's Manual					    GSS_WRAP_SIZE_LIMIT(3)

gss_wrap_size_limit -- Determine maximum message sizes
#include <gssapi/gssapi.h> OM_uint32 gss_wrap_size_limit(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, int conf_req_flag, gss_qop_t qop_req, OM_uint32 req_output_size, OM_uint32 *max_input_size);
Allows an application to determine the maximum message size that, if presented to gss_wrap(3) with the same conf_req_flag and qop_req parame- ters, will result in an output token containing no more than req_output_size bytes. This call is intended for use by applications that communicate over protocols that impose a maximum message size. It enables the application to fragment messages prior to applying protection. GSS-API implementations are recommended but not required to detect invalid QOP values when gss_wrap_size_limit() is called. This routine guarantees only a maximum message size, not the availability of specific QOP values for message protection. Successful completion of this call does not guarantee that gss_wrap(3) will be able to protect a message of length max_input_size bytes, since this ability may depend on the availability of system resources at the time that gss_wrap(3) is called. However, if the implementation itself imposes an upper limit on the length of messages that may be processed by gss_wrap, the implementation should not return a value via max_input_bytes that is greater than this length.
minor_status Mechanism specific status code. context_handle A handle that refers to the security over which the messages will be sent. conf_req_flag Indicates whether gss_wrap(3) will be asked to apply confidentiality protection in addition to integrity protection. qop_req Indicates the level of protection that gss_wrap(3) will be asked to provide. req_output_size The desired maximum size for tokens emitted by gss_wrap(3). max_input_size The maximum input message size that may be presented to gss_wrap(3) in order to guarantee that the emitted token shall be no larger than req_output_size bytes.
GSS_S_COMPLETE Successful completion. GSS_S_NO_CONTEXT The referenced context could not be accessed. GSS_S_CONTEXT_EXPIRED The context has expired. 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_size_limit function first appeared in FreeBSD 7.0.
John Wray, Iris Associates
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January 26, 2010 BSD