gecko-dev/security/nss/lib/util/secdert.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _SECDERT_H_
#define _SECDERT_H_
/*
 * secdert.h - public data structures for the DER encoding and
 *             decoding utilities library
 */

#include "utilrename.h"
#include "seccomon.h"

typedef struct DERTemplateStr DERTemplate;

/*
** An array of these structures defines an encoding for an object using DER.
** The array usually starts with a dummy entry whose kind is DER_SEQUENCE;
** such an array is terminated with an entry where kind == 0.  (An array
** which consists of a single component does not require a second dummy
** entry -- the array is only searched as long as previous component(s)
** instruct it.)
*/
struct DERTemplateStr {
    /*
    ** Kind of item being decoded/encoded, including tags and modifiers.
    */
    unsigned long kind;

    /*
    ** Offset from base of structure to field that holds the value
    ** being decoded/encoded.
    */
    unsigned int offset;

    /*
    ** When kind suggests it (DER_POINTER, DER_INDEFINITE, DER_INLINE),
    ** this points to a sub-template for nested encoding/decoding.
    */
    DERTemplate *sub;

    /*
    ** Argument value, dependent on "kind" and/or template placement
    ** within an array of templates:
    **  - In the first element of a template array, the value is the
    **    size of the structure to allocate when this template is being
    **    referenced by another template via DER_POINTER or DER_INDEFINITE.
    **  - In a component of a DER_SET or DER_SEQUENCE which is *not* a
    **    DER_UNIVERSAL type (that is, it has a class tag for either
    **    DER_APPLICATION, DER_CONTEXT_SPECIFIC, or DER_PRIVATE), the
    **    value is the underlying type of item being decoded/encoded.
    */
    unsigned long arg;
};

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

/* default chunksize for arenas used for DER stuff */
#define DER_DEFAULT_CHUNKSIZE (2048)

/*
** BER/DER values for ASN.1 identifier octets.
*/
#define DER_TAG_MASK 0xff

/*
 * BER/DER universal type tag numbers.
 * The values are defined by the X.208 standard; do not change them!
 * NOTE: if you add anything to this list, you must add code to derdec.c
 * to accept the tag, and probably also to derenc.c to encode it.
 */
#define DER_TAGNUM_MASK 0x1f
#define DER_BOOLEAN 0x01
#define DER_INTEGER 0x02
#define DER_BIT_STRING 0x03
#define DER_OCTET_STRING 0x04
#define DER_NULL 0x05
#define DER_OBJECT_ID 0x06
#define DER_SEQUENCE 0x10
#define DER_SET 0x11
#define DER_PRINTABLE_STRING 0x13
#define DER_T61_STRING 0x14
#define DER_IA5_STRING 0x16
#define DER_UTC_TIME 0x17
#define DER_VISIBLE_STRING 0x1a
#define DER_HIGH_TAG_NUMBER 0x1f

/*
** Modifiers to type tags.  These are also specified by a/the
** standard, and must not be changed.
*/

#define DER_METHOD_MASK 0x20
#define DER_PRIMITIVE 0x00
#define DER_CONSTRUCTED 0x20

#define DER_CLASS_MASK 0xc0
#define DER_UNIVERSAL 0x00
#define DER_APPLICATION 0x40
#define DER_CONTEXT_SPECIFIC 0x80
#define DER_PRIVATE 0xc0

/*
** Our additions, used for templates.
** These are not defined by any standard; the values are used internally only.
** Just be careful to keep them out of the low 8 bits.
*/
#define DER_OPTIONAL 0x00100
#define DER_EXPLICIT 0x00200
#define DER_ANY 0x00400
#define DER_INLINE 0x00800
#define DER_POINTER 0x01000
#define DER_INDEFINITE 0x02000
#define DER_DERPTR 0x04000
#define DER_SKIP 0x08000
#define DER_FORCE 0x10000
#define DER_OUTER 0x40000 /* for DER_DERPTR */

/*
** Macro to convert der decoded bit string into a decoded octet
** string. All it needs to do is fiddle with the length code.
*/
#define DER_ConvertBitString(item)            \
    {                                         \
        (item)->len = ((item)->len + 7) >> 3; \
    }

#endif /* _SECDERT_H_ */