/*
 * 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.
 */

/*
 * Support for encoding/decoding of ASN.1 using BER/DER (Basic/Distinguished
 * Encoding Rules).  The routines are found in and used extensively by the
 * security library, but exported for other use.
 *
 * $Id: secasn1.h,v 1.4 2001/05/02 20:14:46 wtc%netscape.com Exp $
 */

#ifndef _SECASN1_H_
#define _SECASN1_H_

#include "plarena.h"

#include "seccomon.h"
#include "secasn1t.h"


/************************************************************************/
SEC_BEGIN_PROTOS

/*
 * XXX These function prototypes need full, explanatory comments.
 */

/*
** Decoding.
*/

extern SEC_ASN1DecoderContext *SEC_ASN1DecoderStart(PRArenaPool *pool,
						    void *dest,
						    const SEC_ASN1Template *t);

/* XXX char or unsigned char? */
extern SECStatus SEC_ASN1DecoderUpdate(SEC_ASN1DecoderContext *cx,
				       const char *buf,
				       unsigned long len);

extern SECStatus SEC_ASN1DecoderFinish(SEC_ASN1DecoderContext *cx);

extern void SEC_ASN1DecoderSetFilterProc(SEC_ASN1DecoderContext *cx,
					 SEC_ASN1WriteProc fn,
					 void *arg, PRBool no_store);

extern void SEC_ASN1DecoderClearFilterProc(SEC_ASN1DecoderContext *cx);

extern void SEC_ASN1DecoderSetNotifyProc(SEC_ASN1DecoderContext *cx,
					 SEC_ASN1NotifyProc fn,
					 void *arg);

extern void SEC_ASN1DecoderClearNotifyProc(SEC_ASN1DecoderContext *cx);

extern SECStatus SEC_ASN1Decode(PRArenaPool *pool, void *dest,
				const SEC_ASN1Template *t,
				const char *buf, long len);

extern SECStatus SEC_ASN1DecodeItem(PRArenaPool *pool, void *dest,
				    const SEC_ASN1Template *t,
				    SECItem *item);
/*
** Encoding.
*/

extern SEC_ASN1EncoderContext *SEC_ASN1EncoderStart(void *src,
						    const SEC_ASN1Template *t,
						    SEC_ASN1WriteProc fn,
						    void *output_arg);

/* XXX char or unsigned char? */
extern SECStatus SEC_ASN1EncoderUpdate(SEC_ASN1EncoderContext *cx,
				       const char *buf,
				       unsigned long len);

extern void SEC_ASN1EncoderFinish(SEC_ASN1EncoderContext *cx);

extern void SEC_ASN1EncoderSetNotifyProc(SEC_ASN1EncoderContext *cx,
					 SEC_ASN1NotifyProc fn,
					 void *arg);

extern void SEC_ASN1EncoderClearNotifyProc(SEC_ASN1EncoderContext *cx);

extern void SEC_ASN1EncoderSetStreaming(SEC_ASN1EncoderContext *cx);

extern void SEC_ASN1EncoderClearStreaming(SEC_ASN1EncoderContext *cx);

extern void sec_ASN1EncoderSetDER(SEC_ASN1EncoderContext *cx);

extern void sec_ASN1EncoderClearDER(SEC_ASN1EncoderContext *cx);

extern void SEC_ASN1EncoderSetTakeFromBuf(SEC_ASN1EncoderContext *cx);

extern void SEC_ASN1EncoderClearTakeFromBuf(SEC_ASN1EncoderContext *cx);

extern SECStatus SEC_ASN1Encode(void *src, const SEC_ASN1Template *t,
				SEC_ASN1WriteProc output_proc,
				void *output_arg);

extern SECItem * SEC_ASN1EncodeItem(PRArenaPool *pool, SECItem *dest,
				    void *src, const SEC_ASN1Template *t);

extern SECItem * SEC_ASN1EncodeInteger(PRArenaPool *pool,
				       SECItem *dest, long value);

extern SECItem * SEC_ASN1EncodeUnsignedInteger(PRArenaPool *pool,
					       SECItem *dest,
					       unsigned long value);

extern SECStatus SEC_ASN1DecodeInteger(SECItem *src,
				       unsigned long *value);

/*
** Utilities.
*/

/*
 * We have a length that needs to be encoded; how many bytes will the
 * encoding take?
 */
extern int SEC_ASN1LengthLength (unsigned long len);

/* encode the length and return the number of bytes we encoded. Buffer
 * must be pre allocated  */
extern int SEC_ASN1EncodeLength(unsigned char *buf,int value);

/*
 * Find the appropriate subtemplate for the given template.
 * This may involve calling a "chooser" function, or it may just
 * be right there.  In either case, it is expected to *have* a
 * subtemplate; this is asserted in debug builds (in non-debug
 * builds, NULL will be returned).
 *
 * "thing" is a pointer to the structure being encoded/decoded
 * "encoding", when true, means that we are in the process of encoding
 *	(as opposed to in the process of decoding)
 */
extern const SEC_ASN1Template *
SEC_ASN1GetSubtemplate (const SEC_ASN1Template *inTemplate, void *thing,
			PRBool encoding);

/************************************************************************/

/*
 * Generic Templates
 * One for each of the simple types, plus a special one for ANY, plus:
 *	- a pointer to each one of those
 *	- a set of each one of those
 *	- a sequence of each one of those
 *
 * Note that these are alphabetical (case insensitive); please add new
 * ones in the appropriate place.
 */

extern const SEC_ASN1Template SEC_AnyTemplate[];
extern const SEC_ASN1Template SEC_BitStringTemplate[];
extern const SEC_ASN1Template SEC_BMPStringTemplate[];
extern const SEC_ASN1Template SEC_BooleanTemplate[];
extern const SEC_ASN1Template SEC_EnumeratedTemplate[];
extern const SEC_ASN1Template SEC_GeneralizedTimeTemplate[];
extern const SEC_ASN1Template SEC_IA5StringTemplate[];
extern const SEC_ASN1Template SEC_IntegerTemplate[];
extern const SEC_ASN1Template SEC_NullTemplate[];
extern const SEC_ASN1Template SEC_ObjectIDTemplate[];
extern const SEC_ASN1Template SEC_OctetStringTemplate[];
extern const SEC_ASN1Template SEC_PrintableStringTemplate[];
extern const SEC_ASN1Template SEC_T61StringTemplate[];
extern const SEC_ASN1Template SEC_UniversalStringTemplate[];
extern const SEC_ASN1Template SEC_UTCTimeTemplate[];
extern const SEC_ASN1Template SEC_UTF8StringTemplate[];
extern const SEC_ASN1Template SEC_VisibleStringTemplate[];

extern const SEC_ASN1Template SEC_PointerToAnyTemplate[];
extern const SEC_ASN1Template SEC_PointerToBitStringTemplate[];
extern const SEC_ASN1Template SEC_PointerToBMPStringTemplate[];
extern const SEC_ASN1Template SEC_PointerToBooleanTemplate[];
extern const SEC_ASN1Template SEC_PointerToEnumeratedTemplate[];
extern const SEC_ASN1Template SEC_PointerToGeneralizedTimeTemplate[];
extern const SEC_ASN1Template SEC_PointerToIA5StringTemplate[];
extern const SEC_ASN1Template SEC_PointerToIntegerTemplate[];
extern const SEC_ASN1Template SEC_PointerToNullTemplate[];
extern const SEC_ASN1Template SEC_PointerToObjectIDTemplate[];
extern const SEC_ASN1Template SEC_PointerToOctetStringTemplate[];
extern const SEC_ASN1Template SEC_PointerToPrintableStringTemplate[];
extern const SEC_ASN1Template SEC_PointerToT61StringTemplate[];
extern const SEC_ASN1Template SEC_PointerToUniversalStringTemplate[];
extern const SEC_ASN1Template SEC_PointerToUTCTimeTemplate[];
extern const SEC_ASN1Template SEC_PointerToUTF8StringTemplate[];
extern const SEC_ASN1Template SEC_PointerToVisibleStringTemplate[];

extern const SEC_ASN1Template SEC_SequenceOfAnyTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfBitStringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfBMPStringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfBooleanTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfEnumeratedTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfGeneralizedTimeTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfIA5StringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfIntegerTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfNullTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfObjectIDTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfOctetStringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfPrintableStringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfT61StringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfUniversalStringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfUTCTimeTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfUTF8StringTemplate[];
extern const SEC_ASN1Template SEC_SequenceOfVisibleStringTemplate[];

extern const SEC_ASN1Template SEC_SetOfAnyTemplate[];
extern const SEC_ASN1Template SEC_SetOfBitStringTemplate[];
extern const SEC_ASN1Template SEC_SetOfBMPStringTemplate[];
extern const SEC_ASN1Template SEC_SetOfBooleanTemplate[];
extern const SEC_ASN1Template SEC_SetOfEnumeratedTemplate[];
extern const SEC_ASN1Template SEC_SetOfGeneralizedTimeTemplate[];
extern const SEC_ASN1Template SEC_SetOfIA5StringTemplate[];
extern const SEC_ASN1Template SEC_SetOfIntegerTemplate[];
extern const SEC_ASN1Template SEC_SetOfNullTemplate[];
extern const SEC_ASN1Template SEC_SetOfObjectIDTemplate[];
extern const SEC_ASN1Template SEC_SetOfOctetStringTemplate[];
extern const SEC_ASN1Template SEC_SetOfPrintableStringTemplate[];
extern const SEC_ASN1Template SEC_SetOfT61StringTemplate[];
extern const SEC_ASN1Template SEC_SetOfUniversalStringTemplate[];
extern const SEC_ASN1Template SEC_SetOfUTCTimeTemplate[];
extern const SEC_ASN1Template SEC_SetOfUTF8StringTemplate[];
extern const SEC_ASN1Template SEC_SetOfVisibleStringTemplate[];

/*
 * Template for skipping a subitem; this only makes sense when decoding.
 */
extern const SEC_ASN1Template SEC_SkipTemplate[];

/* These functions simply return the address of the above-declared templates.
** This is necessary for Windows DLLs.  Sigh.
*/
SEC_ASN1_CHOOSER_DECLARE(SEC_AnyTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_BMPStringTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_BitStringTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_GeneralizedTimeTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_IA5StringTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_IntegerTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_ObjectIDTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_OctetStringTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_UTCTimeTemplate)

SEC_ASN1_CHOOSER_DECLARE(SEC_PointerToAnyTemplate)
SEC_ASN1_CHOOSER_DECLARE(SEC_PointerToOctetStringTemplate)

SEC_ASN1_CHOOSER_DECLARE(SEC_SetOfAnyTemplate)

SEC_END_PROTOS
#endif /* _SECASN1_H_ */
