/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape security libraries.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

/*
 * X.509 v3 Subject Key Usage Extension 
 *
 */

#include "prtypes.h"
#include "mcom_db.h"
#include "seccomon.h"
#include "secdert.h"
#include "secoidt.h"
#include "secasn1t.h"
#include "secasn1.h"
#include "secport.h"
#include "certt.h"  
#include "genname.h"
#include "secerr.h"

   
const SEC_ASN1Template CERTAuthKeyIDTemplate[] = {
    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(CERTAuthKeyID) },
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONTEXT_SPECIFIC | 0,
	  offsetof(CERTAuthKeyID,keyID), SEC_OctetStringTemplate},
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC  | 1,
          offsetof(CERTAuthKeyID, DERAuthCertIssuer), CERT_GeneralNamesTemplate},
    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONTEXT_SPECIFIC | 2,
	  offsetof(CERTAuthKeyID,authCertSerialNumber), SEC_IntegerTemplate},
    { 0 }
};



SECStatus CERT_EncodeAuthKeyID (PRArenaPool *arena, CERTAuthKeyID *value, SECItem *encodedValue)
{
    SECStatus rv = SECFailure;
 
    PORT_Assert (value);
    PORT_Assert (arena);
    PORT_Assert (value->DERAuthCertIssuer == NULL);
    PORT_Assert (encodedValue);

    do {
	
	/* If both of the authCertIssuer and the serial number exist, encode
	   the name first.  Otherwise, it is an error if one exist and the other
	   is not.
	 */
	if (value->authCertIssuer) {
	    if (!value->authCertSerialNumber.data) {
		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
		break;
	    }

	    value->DERAuthCertIssuer = cert_EncodeGeneralNames
		(arena, value->authCertIssuer);
	    if (!value->DERAuthCertIssuer) {
		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
		break;
	    }
	}
	else if (value->authCertSerialNumber.data) {
		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
		break;
	}

	if (SEC_ASN1EncodeItem (arena, encodedValue, value,
				CERTAuthKeyIDTemplate) == NULL)
	    break;
	rv = SECSuccess;

    } while (0);
     return(rv);
}

CERTAuthKeyID *
CERT_DecodeAuthKeyID (PRArenaPool *arena, SECItem *encodedValue)
{
    CERTAuthKeyID * value = NULL;
    SECStatus       rv    = SECFailure;
    void *          mark;

    PORT_Assert (arena);
   
    do {
	mark = PORT_ArenaMark (arena);
        value = (CERTAuthKeyID*)PORT_ArenaZAlloc (arena, sizeof (*value));
	value->DERAuthCertIssuer = NULL;
	if (value == NULL)
	    break;
	rv = SEC_ASN1DecodeItem
	     (arena, value, CERTAuthKeyIDTemplate, encodedValue);
	if (rv != SECSuccess)
	    break;

        value->authCertIssuer = cert_DecodeGeneralNames (arena, value->DERAuthCertIssuer);
	if (value->authCertIssuer == NULL)
	    break;
	
	/* what if the general name contains other format but not URI ?
	   hl
	 */
	if ((value->authCertSerialNumber.data && !value->authCertIssuer) ||
	    (!value->authCertSerialNumber.data && value->authCertIssuer)){
	    PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
	    break;
	}
    } while (0);

    if (rv != SECSuccess) {
	PORT_ArenaRelease (arena, mark);
	return ((CERTAuthKeyID *)NULL);	    
    } 
    PORT_ArenaUnmark(arena, mark);
    return (value);
}