GSS_VERIFY_MIC(3)

NAME
gss_verify_mic, gss_verify - Check a MIC against a message; verify integrity of a received message

SYNOPSIS
#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);
OM_uint32
gss_verify(OM_uint32 *minor_status, gss_ctx_id_t context_handle, gss_buffer_t message_buffer, gss_buffer_t token_buffer, gss_qop_t *qop_state);

DESCRIPTION
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() to provide "secure framing", implementations must support the calculation and verification of MICs over zero-length messages.

The gss_verify() routine is an obsolete variant of gss_verify_mic(). 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.

message_buffer
    Message to be verified.

token_buffer
    Token associated with message.

qop_state
    Quality of protection gained from MIC. 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_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_verify_mic function first appeared in FreeBSD 7.0.

AUTHORS
John Wray, Iris Associates

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

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