/* asn1.h
 *
 * Copyright (C) 2006-2020 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */

/* asn1.h for openssl */

#ifndef WOLFSSL_ASN1_H_
#define WOLFSSL_ASN1_H_

#include <libwolfssl/openssl/ssl.h>

#define ASN1_STRING_new      wolfSSL_ASN1_STRING_new
#define ASN1_STRING_type_new wolfSSL_ASN1_STRING_type_new
#define ASN1_STRING_type     wolfSSL_ASN1_STRING_type
#define ASN1_STRING_set      wolfSSL_ASN1_STRING_set
#define ASN1_STRING_free     wolfSSL_ASN1_STRING_free

#define V_ASN1_INTEGER                   0x02
#define V_ASN1_OCTET_STRING              0x04 /* tag for ASN1_OCTET_STRING */
#define V_ASN1_NEG                       0x100
#define V_ASN1_NEG_INTEGER               (2 | V_ASN1_NEG)
#define V_ASN1_NEG_ENUMERATED            (10 | V_ASN1_NEG)

/* Type for ASN1_print_ex */
# define ASN1_STRFLGS_ESC_2253           1
# define ASN1_STRFLGS_ESC_CTRL           2
# define ASN1_STRFLGS_ESC_MSB            4
# define ASN1_STRFLGS_ESC_QUOTE          8
# define ASN1_STRFLGS_UTF8_CONVERT       0x10
# define ASN1_STRFLGS_IGNORE_TYPE        0x20
# define ASN1_STRFLGS_SHOW_TYPE          0x40
# define ASN1_STRFLGS_DUMP_ALL           0x80
# define ASN1_STRFLGS_DUMP_UNKNOWN       0x100
# define ASN1_STRFLGS_DUMP_DER           0x200
# define ASN1_STRFLGS_RFC2253            (ASN1_STRFLGS_ESC_2253 | \
                                          ASN1_STRFLGS_ESC_CTRL | \
                                          ASN1_STRFLGS_ESC_MSB | \
                                          ASN1_STRFLGS_UTF8_CONVERT | \
                                          ASN1_STRFLGS_DUMP_UNKNOWN | \
                                          ASN1_STRFLGS_DUMP_DER)

#define MBSTRING_UTF8                    0x1000
#define MBSTRING_ASC                     0x1001
#define MBSTRING_BMP                     0x1002
#define MBSTRING_UNIV                    0x1004

#define ASN1_UTCTIME_print              wolfSSL_ASN1_UTCTIME_print
#define ASN1_TIME_check                 wolfSSL_ASN1_TIME_check
#define ASN1_TIME_diff                  wolfSSL_ASN1_TIME_diff
#define ASN1_TIME_set                   wolfSSL_ASN1_TIME_set

#define V_ASN1_OBJECT                   6
#define V_ASN1_UTCTIME                  23
#define V_ASN1_GENERALIZEDTIME          24

#define ASN1_STRING_FLAG_BITS_LEFT       0x008
#define ASN1_STRING_FLAG_NDEF            0x010
#define ASN1_STRING_FLAG_CONT            0x020
#define ASN1_STRING_FLAG_MSTRING         0x040
#define ASN1_STRING_FLAG_EMBED           0x080


WOLFSSL_API WOLFSSL_ASN1_INTEGER *wolfSSL_BN_to_ASN1_INTEGER(
    const WOLFSSL_BIGNUM*, WOLFSSL_ASN1_INTEGER*);

WOLFSSL_API void wolfSSL_ASN1_TYPE_set(WOLFSSL_ASN1_TYPE *a, int type, void *value);

#ifdef OPENSSL_ALL
/* IMPLEMENT_ASN1_FUNCTIONS is strictly for external use only. Internally
 * we don't use this. Some projects use OpenSSL to implement ASN1 types and
 * this section is only to provide those projects with ASN1 functionality. */
typedef struct {
    size_t offset;              /* Offset of this field in structure */
    byte type;                  /* The type of the member as defined in
                                 * WOLFSSL_ASN1_TYPES */
} WOLFSSL_ASN1_TEMPLATE;

typedef struct {
    byte type;                              /* One of the ASN_Tags types */
    const WOLFSSL_ASN1_TEMPLATE *members;   /* If SEQUENCE or CHOICE this
                                             * contains the contents */
    size_t mcount;                          /* Number of members if SEQUENCE
                                             * or CHOICE */
    size_t size;                            /* Structure size */
} WOLFSSL_ASN1_ITEM;

typedef enum {
    WOLFSSL_X509_ALGOR_ASN1 = 0,
    WOLFSSL_ASN1_BIT_STRING_ASN1,
} WOLFSSL_ASN1_TYPES;

#define ASN1_SEQUENCE(type) \
    static type __##type##_dummy_struct;\
    static const WOLFSSL_ASN1_TEMPLATE type##_member_data[]

#define ASN1_SIMPLE(type, member, member_type) \
    { (char*)&__##type##_dummy_struct.member - (char*)&__##type##_dummy_struct, \
        WOLFSSL_##member_type##_ASN1 }

#define ASN1_SEQUENCE_END(type) \
    ; \
    const WOLFSSL_ASN1_ITEM type##_template_data = { \
            ASN_SEQUENCE, \
            type##_member_data, \
            sizeof(type##_member_data) / sizeof(WOLFSSL_ASN1_TEMPLATE), \
            sizeof(type) \
    };

WOLFSSL_API void *wolfSSL_ASN1_item_new(const WOLFSSL_ASN1_ITEM *tpl);
WOLFSSL_API void wolfSSL_ASN1_item_free(void *val, const WOLFSSL_ASN1_ITEM *tpl);
WOLFSSL_API int wolfSSL_ASN1_item_i2d(const void *src, byte **dest,
                                      const WOLFSSL_ASN1_ITEM *tpl);

/* Need function declaration otherwise compiler complains */
#define IMPLEMENT_ASN1_FUNCTIONS(type) \
    type *type##_new(void); \
    type *type##_new(void){ \
        return (type*)wolfSSL_ASN1_item_new(&type##_template_data); \
    } \
    void type##_free(type *t); \
    void type##_free(type *t){ \
        wolfSSL_ASN1_item_free(t, &type##_template_data); \
    } \
    int i2d_##type(type *src, byte **dest); \
    int i2d_##type(type *src, byte **dest) \
    { \
        return wolfSSL_ASN1_item_i2d(src, dest, &type##_template_data);\
    }

#endif /* OPENSSL_ALL */

#define BN_to_ASN1_INTEGER          wolfSSL_BN_to_ASN1_INTEGER
#define ASN1_TYPE_set               wolfSSL_ASN1_TYPE_set

#endif /* WOLFSSL_ASN1_H_ */