/* #pragma ident        "@(#)g_unseal.c 1.13    98/01/22 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_unwrap
 */

#include "mglueP.h"

OM_uint32 KRB5_CALLCONV
gss_unwrap(OM_uint32 * minor_status, gss_ctx_id_t context_handle,
           gss_buffer_t input_message_buffer,
           gss_buffer_t output_message_buffer,
           int *conf_state, gss_qop_t *qop_state)
{
/* EXPORT DELETE START */
    OM_uint32           status;
    gss_union_ctx_id_t  ctx;
    gss_mechanism       mech;

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

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

    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 (input_message_buffer == GSS_C_NO_BUFFER ||
        GSS_EMPTY_BUFFER(input_message_buffer))

        return (GSS_S_CALL_INACCESSIBLE_READ);

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

    /*
     * 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_unwrap) {
            status = mech->gss_unwrap(minor_status,
                                      ctx->internal_ctx_id,
                                      input_message_buffer,
                                      output_message_buffer,
                                      conf_state,
                                      qop_state);
            if (status != GSS_S_COMPLETE)
                map_error(minor_status, mech);
        } else if (mech->gss_unwrap_aead || mech->gss_unwrap_iov) {
            status = gssint_unwrap_aead(mech,
                                        minor_status,
                                        ctx,
                                        input_message_buffer,
                                        GSS_C_NO_BUFFER,
                                        output_message_buffer,
                                        conf_state,
                                        (gss_qop_t *)qop_state);
        } else
            status = GSS_S_UNAVAILABLE;

        return(status);
    }

/* EXPORT DELETE END */

    return (GSS_S_BAD_MECH);
}

OM_uint32 KRB5_CALLCONV
gss_unseal(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
           gss_buffer_t input_message_buffer,
           gss_buffer_t output_message_buffer, int *conf_state, int *qop_state)
{
    return (gss_unwrap(minor_status, context_handle,
                       input_message_buffer,
                       output_message_buffer, conf_state, (gss_qop_t *) qop_state));
}