/* #pragma ident        "@(#)g_sign.c   1.14    98/04/23 SMI" */

/*
 * Copyright 1996 by Sun Microsystems, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appears in all copies and
 * that both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Sun Microsystems not be used
 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission. Sun Microsystems makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * SUN MICROSYSTEMS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL SUN MICROSYSTEMS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 *  glue routine gss_get_mic
 */

#include "mglueP.h"

static OM_uint32
val_get_mic_args(
    OM_uint32 *minor_status,
    gss_ctx_id_t context_handle,
    gss_qop_t qop_req,
    gss_buffer_t message_buffer,
    gss_buffer_t msg_token)
{

    /* Initialize outputs. */

    if (minor_status != NULL)
        *minor_status = 0;

    if (msg_token != GSS_C_NO_BUFFER) {
        msg_token->value = NULL;
        msg_token->length = 0;
    }

    /* Validate arguments. */

    if (minor_status == NULL)
        return (GSS_S_CALL_INACCESSIBLE_WRITE);

    if (context_handle == GSS_C_NO_CONTEXT)
        return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT);

    if (message_buffer == GSS_C_NO_BUFFER)
        return (GSS_S_CALL_INACCESSIBLE_READ);

    if (msg_token == GSS_C_NO_BUFFER)
        return (GSS_S_CALL_INACCESSIBLE_WRITE);

    return (GSS_S_COMPLETE);
}


OM_uint32 KRB5_CALLCONV
gss_get_mic(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
            gss_qop_t qop_req, gss_buffer_t message_buffer,
            gss_buffer_t msg_token)
{
    OM_uint32           status;
    gss_union_ctx_id_t  ctx;
    gss_mechanism       mech;

    status = val_get_mic_args(minor_status, context_handle,
                              qop_req, message_buffer, msg_token);
    if (status != GSS_S_COMPLETE)
        return (status);

    /*
     * select the approprate underlying mechanism routine and
     * call it.
     */

    ctx = (gss_union_ctx_id_t) context_handle;
    if (ctx->internal_ctx_id == GSS_C_NO_CONTEXT)
        return (GSS_S_NO_CONTEXT);
    mech = gssint_get_mechanism (ctx->mech_type);

    if (mech) {
        if (mech->gss_get_mic) {
            status = mech->gss_get_mic(
                                    minor_status,
                                    ctx->internal_ctx_id,
                                    qop_req,
                                    message_buffer,
                                    msg_token);
            if (status != GSS_S_COMPLETE)
                map_error(minor_status, mech);
        } else
            status = GSS_S_UNAVAILABLE;

        return(status);
    }

    return (GSS_S_BAD_MECH);
}

OM_uint32 KRB5_CALLCONV
gss_sign(OM_uint32 *minor_status, gss_ctx_id_t context_handle, int qop_req,
         gss_buffer_t message_buffer, gss_buffer_t msg_token)
{
        return (gss_get_mic(minor_status, context_handle, (gss_qop_t) qop_req,
                            message_buffer, msg_token));
}