/*
 * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef OSSL_INTERNAL_DER_H
# define OSSL_INTERNAL_DER_H
# pragma once

# include <openssl/bn.h>
# include "internal/packet.h"

/*
 * NOTE: X.690 numbers the identifier octet bits 1 to 8.
 * We use the same numbering in comments here.
 */

/* Well known primitive tags */

/*
 * DER UNIVERSAL tags, occupying bits 1-5 in the DER identifier byte
 * These are only valid for the UNIVERSAL class.  With the other classes,
 * these bits have a different meaning.
 */
# define DER_P_EOC                       0 /* BER End Of Contents tag */
# define DER_P_BOOLEAN                   1
# define DER_P_INTEGER                   2
# define DER_P_BIT_STRING                3
# define DER_P_OCTET_STRING              4
# define DER_P_NULL                      5
# define DER_P_OBJECT                    6
# define DER_P_OBJECT_DESCRIPTOR         7
# define DER_P_EXTERNAL                  8
# define DER_P_REAL                      9
# define DER_P_ENUMERATED               10
# define DER_P_UTF8STRING               12
# define DER_P_SEQUENCE                 16
# define DER_P_SET                      17
# define DER_P_NUMERICSTRING            18
# define DER_P_PRINTABLESTRING          19
# define DER_P_T61STRING                20
# define DER_P_VIDEOTEXSTRING           21
# define DER_P_IA5STRING                22
# define DER_P_UTCTIME                  23
# define DER_P_GENERALIZEDTIME          24
# define DER_P_GRAPHICSTRING            25
# define DER_P_ISO64STRING              26
# define DER_P_GENERALSTRING            27
# define DER_P_UNIVERSALSTRING          28
# define DER_P_BMPSTRING                30

/* DER Flags, occupying bit 6 in the DER identifier byte */
# define DER_F_PRIMITIVE              0x00
# define DER_F_CONSTRUCTED            0x20

/* DER classes tags, occupying bits 7-8 in the DER identifier byte */
# define DER_C_UNIVERSAL              0x00
# define DER_C_APPLICATION            0x40
# define DER_C_CONTEXT                0x80
# define DER_C_PRIVATE                0xC0

/*
 * Run-time constructors.
 *
 * They all construct DER backwards, so care should be taken to use them
 * that way.
 */

/* This can be used for all items that don't have a context */
# define DER_NO_CONTEXT  -1

int ossl_DER_w_precompiled(WPACKET *pkt, int tag,
                           const unsigned char *precompiled,
                           size_t precompiled_n);

int ossl_DER_w_boolean(WPACKET *pkt, int tag, int b);
int ossl_DER_w_ulong(WPACKET *pkt, int tag, unsigned long v);
int ossl_DER_w_bn(WPACKET *pkt, int tag, const BIGNUM *v);
int ossl_DER_w_null(WPACKET *pkt, int tag);
int ossl_DER_w_octet_string(WPACKET *pkt, int tag,
                            const unsigned char *data, size_t data_n);
int ossl_DER_w_octet_string_uint32(WPACKET *pkt, int tag, uint32_t value);

/*
 * All constructors for constructed elements have a begin and a end function
 */
int ossl_DER_w_begin_sequence(WPACKET *pkt, int tag);
int ossl_DER_w_end_sequence(WPACKET *pkt, int tag);

#endif