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gecko/security/nss/lib/util/secasn1t.h
Benjamin Smedberg e0d84f35cb Import NSS_3_12_RC4
2008-06-06 08:40:11 -04:00

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Types for encoding/decoding of ASN.1 using BER/DER (Basic/Distinguished
* Encoding Rules).
*
* $Id: secasn1t.h,v 1.10 2007/10/12 01:44:51 julien.pierre.boogz%sun.com Exp $
*/
#ifndef _SECASN1T_H_
#define _SECASN1T_H_
#include "utilrename.h"
/*
** An array of these structures defines a BER/DER encoding for an object.
**
** The array usually starts with a dummy entry whose kind is SEC_ASN1_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.)
*/
typedef struct sec_ASN1Template_struct {
/*
** Kind of item being decoded/encoded, including tags and modifiers.
*/
unsigned long kind;
/*
** The value is the offset from the base of the structure to the
** field that holds the value being decoded/encoded.
*/
unsigned long offset;
/*
** When kind suggests it (SEC_ASN1_POINTER, SEC_ASN1_GROUP, SEC_ASN1_INLINE,
** or a component that is *not* a SEC_ASN1_UNIVERSAL), this points to
** a sub-template for nested encoding/decoding,
** OR, iff SEC_ASN1_DYNAMIC is set, then this is a pointer to a pointer
** to a function which will return the appropriate template when called
** at runtime. NOTE! that explicit level of indirection, which is
** necessary because ANSI does not allow you to store a function
** pointer directly as a "void *" so we must store it separately and
** dereference it to get at the function pointer itself.
*/
const void *sub;
/*
** 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 SEC_ASN1_POINTER or SEC_ASN1_GROUP.
** In all other cases, the value is ignored.
*/
unsigned int size;
} SEC_ASN1Template;
/* default size used for allocation of encoding/decoding stuff */
/* XXX what is the best value here? */
#define SEC_ASN1_DEFAULT_ARENA_SIZE (2048)
/*
** BER/DER values for ASN.1 identifier octets.
*/
#define SEC_ASN1_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 secasn1d.c
* to accept the tag, and probably also to secasn1e.c to encode it.
* XXX It appears some have been added recently without being added to
* the code; so need to go through the list now and double-check them all.
* (Look especially at those added in revision 1.10.)
*/
#define SEC_ASN1_TAGNUM_MASK 0x1f
#define SEC_ASN1_BOOLEAN 0x01
#define SEC_ASN1_INTEGER 0x02
#define SEC_ASN1_BIT_STRING 0x03
#define SEC_ASN1_OCTET_STRING 0x04
#define SEC_ASN1_NULL 0x05
#define SEC_ASN1_OBJECT_ID 0x06
#define SEC_ASN1_OBJECT_DESCRIPTOR 0x07
/* External type and instance-of type 0x08 */
#define SEC_ASN1_REAL 0x09
#define SEC_ASN1_ENUMERATED 0x0a
#define SEC_ASN1_EMBEDDED_PDV 0x0b
#define SEC_ASN1_UTF8_STRING 0x0c
/* 0x0d */
/* 0x0e */
/* 0x0f */
#define SEC_ASN1_SEQUENCE 0x10
#define SEC_ASN1_SET 0x11
#define SEC_ASN1_NUMERIC_STRING 0x12
#define SEC_ASN1_PRINTABLE_STRING 0x13
#define SEC_ASN1_T61_STRING 0x14
#define SEC_ASN1_VIDEOTEX_STRING 0x15
#define SEC_ASN1_IA5_STRING 0x16
#define SEC_ASN1_UTC_TIME 0x17
#define SEC_ASN1_GENERALIZED_TIME 0x18
#define SEC_ASN1_GRAPHIC_STRING 0x19
#define SEC_ASN1_VISIBLE_STRING 0x1a
#define SEC_ASN1_GENERAL_STRING 0x1b
#define SEC_ASN1_UNIVERSAL_STRING 0x1c
/* 0x1d */
#define SEC_ASN1_BMP_STRING 0x1e
#define SEC_ASN1_HIGH_TAG_NUMBER 0x1f
#define SEC_ASN1_TELETEX_STRING SEC_ASN1_T61_STRING
/*
** Modifiers to type tags. These are also specified by a/the
** standard, and must not be changed.
*/
#define SEC_ASN1_METHOD_MASK 0x20
#define SEC_ASN1_PRIMITIVE 0x00
#define SEC_ASN1_CONSTRUCTED 0x20
#define SEC_ASN1_CLASS_MASK 0xc0
#define SEC_ASN1_UNIVERSAL 0x00
#define SEC_ASN1_APPLICATION 0x40
#define SEC_ASN1_CONTEXT_SPECIFIC 0x80
#define SEC_ASN1_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.
** XXX finish comments
*/
#define SEC_ASN1_OPTIONAL 0x00100
#define SEC_ASN1_EXPLICIT 0x00200
#define SEC_ASN1_ANY 0x00400
#define SEC_ASN1_INLINE 0x00800
#define SEC_ASN1_POINTER 0x01000
#define SEC_ASN1_GROUP 0x02000 /* with SET or SEQUENCE means
* SET OF or SEQUENCE OF */
#define SEC_ASN1_DYNAMIC 0x04000 /* subtemplate is found by calling
* a function at runtime */
#define SEC_ASN1_SKIP 0x08000 /* skip a field; only for decoding */
#define SEC_ASN1_INNER 0x10000 /* with ANY means capture the
* contents only (not the id, len,
* or eoc); only for decoding */
#define SEC_ASN1_SAVE 0x20000 /* stash away the encoded bytes first;
* only for decoding */
#define SEC_ASN1_MAY_STREAM 0x40000 /* field or one of its sub-fields may
* stream in and so should encode as
* indefinite-length when streaming
* has been indicated; only for
* encoding */
#define SEC_ASN1_SKIP_REST 0x80000 /* skip all following fields;
only for decoding */
#define SEC_ASN1_CHOICE 0x100000 /* pick one from a template */
#define SEC_ASN1_NO_STREAM 0X200000 /* This entry will not stream
even if the sub-template says
streaming is possible. Helps
to solve ambiguities with potential
streaming entries that are
optional */
#define SEC_ASN1_DEBUG_BREAK 0X400000 /* put this in your template and the
decoder will assert when it
processes it. Only for use with
SEC_QuickDERDecodeItem */
/* Shorthand/Aliases */
#define SEC_ASN1_SEQUENCE_OF (SEC_ASN1_GROUP | SEC_ASN1_SEQUENCE)
#define SEC_ASN1_SET_OF (SEC_ASN1_GROUP | SEC_ASN1_SET)
#define SEC_ASN1_ANY_CONTENTS (SEC_ASN1_ANY | SEC_ASN1_INNER)
/* Maximum depth of nested SEQUENCEs and SETs */
#define SEC_ASN1D_MAX_DEPTH 32
/*
** Function used for SEC_ASN1_DYNAMIC.
** "arg" is a pointer to the structure being encoded/decoded
** "enc", when true, means that we are encoding (false means decoding)
*/
typedef const SEC_ASN1Template * SEC_ASN1TemplateChooser(void *arg, PRBool enc);
typedef SEC_ASN1TemplateChooser * SEC_ASN1TemplateChooserPtr;
#if defined(_WIN32)
#define SEC_ASN1_GET(x) NSS_Get_##x(NULL, PR_FALSE)
#define SEC_ASN1_SUB(x) &p_NSS_Get_##x
#define SEC_ASN1_XTRN SEC_ASN1_DYNAMIC
#define SEC_ASN1_MKSUB(x) \
static const SEC_ASN1TemplateChooserPtr p_NSS_Get_##x = &NSS_Get_##x;
#else
#define SEC_ASN1_GET(x) x
#define SEC_ASN1_SUB(x) x
#define SEC_ASN1_XTRN 0
#define SEC_ASN1_MKSUB(x)
#endif
#define SEC_ASN1_CHOOSER_DECLARE(x) \
extern const SEC_ASN1Template * NSS_Get_##x (void *arg, PRBool enc);
#define SEC_ASN1_CHOOSER_IMPLEMENT(x) \
const SEC_ASN1Template * NSS_Get_##x(void * arg, PRBool enc) \
{ return x; }
/*
** Opaque object used by the decoder to store state.
*/
typedef struct sec_DecoderContext_struct SEC_ASN1DecoderContext;
/*
** Opaque object used by the encoder to store state.
*/
typedef struct sec_EncoderContext_struct SEC_ASN1EncoderContext;
/*
* This is used to describe to a filter function the bytes that are
* being passed to it. This is only useful when the filter is an "outer"
* one, meaning it expects to get *all* of the bytes not just the
* contents octets.
*/
typedef enum {
SEC_ASN1_Identifier = 0,
SEC_ASN1_Length = 1,
SEC_ASN1_Contents = 2,
SEC_ASN1_EndOfContents = 3
} SEC_ASN1EncodingPart;
/*
* Type of the function pointer used either for decoding or encoding,
* when doing anything "funny" (e.g. manipulating the data stream)
*/
typedef void (* SEC_ASN1NotifyProc)(void *arg, PRBool before,
void *dest, int real_depth);
/*
* Type of the function pointer used for grabbing encoded bytes.
* This can be used during either encoding or decoding, as follows...
*
* When decoding, this can be used to filter the encoded bytes as they
* are parsed. This is what you would do if you wanted to process the data
* along the way (like to decrypt it, or to perform a hash on it in order
* to do a signature check later). See SEC_ASN1DecoderSetFilterProc().
* When processing only part of the encoded bytes is desired, you "watch"
* for the field(s) you are interested in with a "notify proc" (see
* SEC_ASN1DecoderSetNotifyProc()) and for even finer granularity (e.g. to
* ignore all by the contents bytes) you pay attention to the "data_kind"
* parameter.
*
* When encoding, this is the specification for the output function which
* will receive the bytes as they are encoded. The output function can
* perform any postprocessing necessary (like hashing (some of) the data
* to create a digest that gets included at the end) as well as shoving
* the data off wherever it needs to go. (In order to "tune" any processing,
* you can set a "notify proc" as described above in the decoding case.)
*
* The parameters:
* - "arg" is an opaque pointer that you provided at the same time you
* specified a function of this type
* - "data" is a buffer of length "len", containing the encoded bytes
* - "depth" is how deep in a nested encoding we are (it is not usually
* valuable, but can be useful sometimes so I included it)
* - "data_kind" tells you if these bytes are part of the ASN.1 encoded
* octets for identifier, length, contents, or end-of-contents
*/
typedef void (* SEC_ASN1WriteProc)(void *arg,
const char *data, unsigned long len,
int depth, SEC_ASN1EncodingPart data_kind);
#endif /* _SECASN1T_H_ */
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