Tribblix: manual page: gss_verify

GSS_VERIFY_MIC(3GSS) Generic Security Services API Library Functions

NAME

gss_verify_mic - verify integrity of a received message

SYNOPSIS

cc [ flag... ] file... -lgss [ library... ]
#include <gssapi/gssapi.h>

OM_uint32 gss_verify_mic(OM_uint32 *minor_status,
const gss_ctx_id_t context_handle, const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer, gss_qop_t *qop_state);

DESCRIPTION

The gss_verify_mic() function verifies that a cryptographic MIC,
contained in the token parameter, fits the supplied message. The
qop_state parameter allows a message recipient to determine the
strength of protection that was applied to the message.

Since some application-level protocols may wish to use tokens emitted
by gss_wrap(3GSS) to provide secure framing, the GSS-API supports the
calculation and verification of MICs over zero-length messages.

PARAMETERS

The parameter descriptions for gss_verify_mic() follow:

minor_status
The status code returned by the underlying
mechanism.

context_handle
Identifies the context on which the message
arrived.

message_buffer
The message to be verified.

token_buffer
The token associated with the message.

qop_state
Specifies the quality of protection gained from the
MIC. Specify NULL if this parameter is not
required.

ERRORS

gss_verify_mic() may return the following status codes:

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 it 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 it 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.

GSS_S_FAILURE
The underlying mechanism detected an error
for which no specific GSS status code is
defined. The mechanism-specific status code
reported by means of the minor_status
parameter details the error condition.