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269 lines
10 KiB
C
269 lines
10 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Types for encoding/decoding of ASN.1 using BER/DER (Basic/Distinguished
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* Encoding Rules).
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*/
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#ifndef _SECASN1T_H_
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#define _SECASN1T_H_
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#include "utilrename.h"
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/*
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** An array of these structures defines a BER/DER encoding for an object.
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**
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** The array usually starts with a dummy entry whose kind is SEC_ASN1_SEQUENCE;
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** such an array is terminated with an entry where kind == 0. (An array
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** which consists of a single component does not require a second dummy
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** entry -- the array is only searched as long as previous component(s)
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** instruct it.)
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*/
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typedef struct sec_ASN1Template_struct {
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/*
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** Kind of item being decoded/encoded, including tags and modifiers.
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*/
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unsigned long kind;
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/*
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** The value is the offset from the base of the structure to the
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** field that holds the value being decoded/encoded.
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*/
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unsigned long offset;
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/*
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** When kind suggests it (SEC_ASN1_POINTER, SEC_ASN1_GROUP, SEC_ASN1_INLINE,
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** or a component that is *not* a SEC_ASN1_UNIVERSAL), this points to
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** a sub-template for nested encoding/decoding,
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** OR, iff SEC_ASN1_DYNAMIC is set, then this is a pointer to a pointer
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** to a function which will return the appropriate template when called
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** at runtime. NOTE! that explicit level of indirection, which is
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** necessary because ANSI does not allow you to store a function
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** pointer directly as a "void *" so we must store it separately and
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** dereference it to get at the function pointer itself.
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*/
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const void *sub;
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/*
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** In the first element of a template array, the value is the size
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** of the structure to allocate when this template is being referenced
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** by another template via SEC_ASN1_POINTER or SEC_ASN1_GROUP.
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** In all other cases, the value is ignored.
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*/
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unsigned int size;
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} SEC_ASN1Template;
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/* default size used for allocation of encoding/decoding stuff */
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/* XXX what is the best value here? */
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#define SEC_ASN1_DEFAULT_ARENA_SIZE (2048)
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/*
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** BER/DER values for ASN.1 identifier octets.
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*/
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#define SEC_ASN1_TAG_MASK 0xff
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/*
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* BER/DER universal type tag numbers.
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* The values are defined by the X.208 standard; do not change them!
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* NOTE: if you add anything to this list, you must add code to secasn1d.c
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* to accept the tag, and probably also to secasn1e.c to encode it.
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* XXX It appears some have been added recently without being added to
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* the code; so need to go through the list now and double-check them all.
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* (Look especially at those added in revision 1.10.)
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*/
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#define SEC_ASN1_TAGNUM_MASK 0x1f
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#define SEC_ASN1_BOOLEAN 0x01
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#define SEC_ASN1_INTEGER 0x02
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#define SEC_ASN1_BIT_STRING 0x03
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#define SEC_ASN1_OCTET_STRING 0x04
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#define SEC_ASN1_NULL 0x05
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#define SEC_ASN1_OBJECT_ID 0x06
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#define SEC_ASN1_OBJECT_DESCRIPTOR 0x07
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/* External type and instance-of type 0x08 */
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#define SEC_ASN1_REAL 0x09
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#define SEC_ASN1_ENUMERATED 0x0a
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#define SEC_ASN1_EMBEDDED_PDV 0x0b
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#define SEC_ASN1_UTF8_STRING 0x0c
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/* 0x0d */
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/* 0x0e */
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/* 0x0f */
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#define SEC_ASN1_SEQUENCE 0x10
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#define SEC_ASN1_SET 0x11
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#define SEC_ASN1_NUMERIC_STRING 0x12
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#define SEC_ASN1_PRINTABLE_STRING 0x13
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#define SEC_ASN1_T61_STRING 0x14
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#define SEC_ASN1_VIDEOTEX_STRING 0x15
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#define SEC_ASN1_IA5_STRING 0x16
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#define SEC_ASN1_UTC_TIME 0x17
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#define SEC_ASN1_GENERALIZED_TIME 0x18
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#define SEC_ASN1_GRAPHIC_STRING 0x19
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#define SEC_ASN1_VISIBLE_STRING 0x1a
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#define SEC_ASN1_GENERAL_STRING 0x1b
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#define SEC_ASN1_UNIVERSAL_STRING 0x1c
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/* 0x1d */
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#define SEC_ASN1_BMP_STRING 0x1e
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#define SEC_ASN1_HIGH_TAG_NUMBER 0x1f
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#define SEC_ASN1_TELETEX_STRING SEC_ASN1_T61_STRING
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/*
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** Modifiers to type tags. These are also specified by a/the
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** standard, and must not be changed.
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*/
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#define SEC_ASN1_METHOD_MASK 0x20
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#define SEC_ASN1_PRIMITIVE 0x00
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#define SEC_ASN1_CONSTRUCTED 0x20
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#define SEC_ASN1_CLASS_MASK 0xc0
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#define SEC_ASN1_UNIVERSAL 0x00
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#define SEC_ASN1_APPLICATION 0x40
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#define SEC_ASN1_CONTEXT_SPECIFIC 0x80
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#define SEC_ASN1_PRIVATE 0xc0
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/*
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** Our additions, used for templates.
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** These are not defined by any standard; the values are used internally only.
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** Just be careful to keep them out of the low 8 bits.
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** XXX finish comments
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*/
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#define SEC_ASN1_OPTIONAL 0x00100
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#define SEC_ASN1_EXPLICIT 0x00200
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#define SEC_ASN1_ANY 0x00400
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#define SEC_ASN1_INLINE 0x00800
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#define SEC_ASN1_POINTER 0x01000
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#define SEC_ASN1_GROUP 0x02000 /* with SET or SEQUENCE means
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* SET OF or SEQUENCE OF */
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#define SEC_ASN1_DYNAMIC 0x04000 /* subtemplate is found by calling
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* a function at runtime */
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#define SEC_ASN1_SKIP 0x08000 /* skip a field; only for decoding */
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#define SEC_ASN1_INNER 0x10000 /* with ANY means capture the
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* contents only (not the id, len,
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* or eoc); only for decoding */
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#define SEC_ASN1_SAVE 0x20000 /* stash away the encoded bytes first;
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* only for decoding */
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#define SEC_ASN1_MAY_STREAM 0x40000 /* field or one of its sub-fields may
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* stream in and so should encode as
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* indefinite-length when streaming
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* has been indicated; only for
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* encoding */
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#define SEC_ASN1_SKIP_REST 0x80000 /* skip all following fields;
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only for decoding */
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#define SEC_ASN1_CHOICE 0x100000 /* pick one from a template */
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#define SEC_ASN1_NO_STREAM 0X200000 /* This entry will not stream
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even if the sub-template says
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streaming is possible. Helps
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to solve ambiguities with potential
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streaming entries that are
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optional */
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#define SEC_ASN1_DEBUG_BREAK 0X400000 /* put this in your template and the
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decoder will assert when it
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processes it. Only for use with
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SEC_QuickDERDecodeItem */
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/* Shorthand/Aliases */
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#define SEC_ASN1_SEQUENCE_OF (SEC_ASN1_GROUP | SEC_ASN1_SEQUENCE)
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#define SEC_ASN1_SET_OF (SEC_ASN1_GROUP | SEC_ASN1_SET)
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#define SEC_ASN1_ANY_CONTENTS (SEC_ASN1_ANY | SEC_ASN1_INNER)
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/* Maximum depth of nested SEQUENCEs and SETs */
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#define SEC_ASN1D_MAX_DEPTH 32
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/*
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** Function used for SEC_ASN1_DYNAMIC.
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** "arg" is a pointer to the structure being encoded/decoded
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** "enc", when true, means that we are encoding (false means decoding)
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*/
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typedef const SEC_ASN1Template * SEC_ASN1TemplateChooser(void *arg, PRBool enc);
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typedef SEC_ASN1TemplateChooser * SEC_ASN1TemplateChooserPtr;
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#if defined(_WIN32) || defined(ANDROID)
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#define SEC_ASN1_GET(x) NSS_Get_##x(NULL, PR_FALSE)
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#define SEC_ASN1_SUB(x) &p_NSS_Get_##x
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#define SEC_ASN1_XTRN SEC_ASN1_DYNAMIC
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#define SEC_ASN1_MKSUB(x) \
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static const SEC_ASN1TemplateChooserPtr p_NSS_Get_##x = &NSS_Get_##x;
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#else
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#define SEC_ASN1_GET(x) x
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#define SEC_ASN1_SUB(x) x
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#define SEC_ASN1_XTRN 0
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#define SEC_ASN1_MKSUB(x)
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#endif
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#define SEC_ASN1_CHOOSER_DECLARE(x) \
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extern const SEC_ASN1Template * NSS_Get_##x (void *arg, PRBool enc);
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#define SEC_ASN1_CHOOSER_IMPLEMENT(x) \
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const SEC_ASN1Template * NSS_Get_##x(void * arg, PRBool enc) \
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{ return x; }
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/*
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** Opaque object used by the decoder to store state.
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*/
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typedef struct sec_DecoderContext_struct SEC_ASN1DecoderContext;
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/*
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** Opaque object used by the encoder to store state.
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*/
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typedef struct sec_EncoderContext_struct SEC_ASN1EncoderContext;
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/*
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* This is used to describe to a filter function the bytes that are
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* being passed to it. This is only useful when the filter is an "outer"
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* one, meaning it expects to get *all* of the bytes not just the
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* contents octets.
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*/
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typedef enum {
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SEC_ASN1_Identifier = 0,
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SEC_ASN1_Length = 1,
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SEC_ASN1_Contents = 2,
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SEC_ASN1_EndOfContents = 3
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} SEC_ASN1EncodingPart;
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/*
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* Type of the function pointer used either for decoding or encoding,
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* when doing anything "funny" (e.g. manipulating the data stream)
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*/
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typedef void (* SEC_ASN1NotifyProc)(void *arg, PRBool before,
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void *dest, int real_depth);
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/*
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* Type of the function pointer used for grabbing encoded bytes.
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* This can be used during either encoding or decoding, as follows...
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*
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* When decoding, this can be used to filter the encoded bytes as they
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* are parsed. This is what you would do if you wanted to process the data
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* along the way (like to decrypt it, or to perform a hash on it in order
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* to do a signature check later). See SEC_ASN1DecoderSetFilterProc().
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* When processing only part of the encoded bytes is desired, you "watch"
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* for the field(s) you are interested in with a "notify proc" (see
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* SEC_ASN1DecoderSetNotifyProc()) and for even finer granularity (e.g. to
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* ignore all by the contents bytes) you pay attention to the "data_kind"
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* parameter.
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*
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* When encoding, this is the specification for the output function which
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* will receive the bytes as they are encoded. The output function can
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* perform any postprocessing necessary (like hashing (some of) the data
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* to create a digest that gets included at the end) as well as shoving
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* the data off wherever it needs to go. (In order to "tune" any processing,
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* you can set a "notify proc" as described above in the decoding case.)
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*
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* The parameters:
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* - "arg" is an opaque pointer that you provided at the same time you
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* specified a function of this type
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* - "data" is a buffer of length "len", containing the encoded bytes
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* - "depth" is how deep in a nested encoding we are (it is not usually
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* valuable, but can be useful sometimes so I included it)
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* - "data_kind" tells you if these bytes are part of the ASN.1 encoded
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* octets for identifier, length, contents, or end-of-contents
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*/
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typedef void (* SEC_ASN1WriteProc)(void *arg,
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const char *data, unsigned long len,
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int depth, SEC_ASN1EncodingPart data_kind);
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#endif /* _SECASN1T_H_ */
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