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1d39620b34
This library is meant to be small and quick. It's based on WPACKET,
which was extended to support DER writing. The way it's used is a
bit unusual, as it's used to write the structures backward into a
given buffer. A typical quick call looks like this:
/*
* Fill in this structure:
*
* something ::= SEQUENCE {
* id OBJECT IDENTIFIER,
* x [0] INTEGER OPTIONAL,
* y [1] BOOLEAN OPTIONAL,
* n INTEGER
* }
*/
unsigned char buf[nnnn], *p = NULL;
size_t encoded_len = 0;
WPACKET pkt;
int ok;
ok = WPACKET_init_der(&pkt, buf, sizeof(buf)
&& DER_w_start_sequence(&pkt, -1)
&& DER_w_bn(&pkt, -1, bn)
&& DER_w_boolean(&pkt, 1, bool)
&& DER_w_precompiled(&pkt, -1, OID, sizeof(OID))
&& DER_w_end_sequence(&pkt, -1)
&& WPACKET_finish(&pkt)
&& WPACKET_get_total_written(&pkt, &encoded_len)
&& (p = WPACKET_get_curr(&pkt)) != NULL;
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11450)
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/*
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* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/bn.h>
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#include "internal/packet.h"
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/*
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* NOTE: X.690 numbers the identifier octet bits 1 to 8.
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* We use the same numbering in comments here.
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*/
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/* Well known primitive tags */
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/*
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* DER UNIVERSAL tags, occupying bits 1-5 in the DER identifier byte
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* These are only valid for the UNIVERSAL class. With the other classes,
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* these bits have a different meaning.
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*/
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#define DER_P_EOC 0 /* BER End Of Contents tag */
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#define DER_P_BOOLEAN 1
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#define DER_P_INTEGER 2
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#define DER_P_BIT_STRING 3
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#define DER_P_OCTET_STRING 4
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#define DER_P_NULL 5
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#define DER_P_OBJECT 6
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#define DER_P_OBJECT_DESCRIPTOR 7
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#define DER_P_EXTERNAL 8
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#define DER_P_REAL 9
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#define DER_P_ENUMERATED 10
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#define DER_P_UTF8STRING 12
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#define DER_P_SEQUENCE 16
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#define DER_P_SET 17
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#define DER_P_NUMERICSTRING 18
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#define DER_P_PRINTABLESTRING 19
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#define DER_P_T61STRING 20
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#define DER_P_VIDEOTEXSTRING 21
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#define DER_P_IA5STRING 22
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#define DER_P_UTCTIME 23
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#define DER_P_GENERALIZEDTIME 24
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#define DER_P_GRAPHICSTRING 25
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#define DER_P_ISO64STRING 26
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#define DER_P_GENERALSTRING 27
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#define DER_P_UNIVERSALSTRING 28
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#define DER_P_BMPSTRING 30
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/* DER Flags, occupying bit 6 in the DER identifier byte */
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#define DER_F_PRIMITIVE 0x00
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#define DER_F_CONSTRUCTED 0x20
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/* DER classes tags, occupying bits 7-8 in the DER identifier byte */
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#define DER_C_UNIVERSAL 0x00
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#define DER_C_APPLICATION 0x40
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#define DER_C_CONTEXT 0x80
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#define DER_C_PRIVATE 0xC0
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/*
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* Run-time constructors.
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*
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* They all construct DER backwards, so care should be taken to use them
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* that way.
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*/
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/* This can be used for all items that don't have a context */
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#define DER_NO_CONTEXT -1
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int DER_w_precompiled(WPACKET *pkt, int tag,
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const unsigned char *precompiled, size_t precompiled_n);
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int DER_w_boolean(WPACKET *pkt, int tag, int b);
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int DER_w_ulong(WPACKET *pkt, int tag, unsigned long v);
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int DER_w_bn(WPACKET *pkt, int tag, const BIGNUM *v);
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int DER_w_null(WPACKET *pkt, int tag);
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/*
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* All constructors for constructed elements have a begin and a end function
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*/
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int DER_w_begin_sequence(WPACKET *pkt, int tag);
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int DER_w_end_sequence(WPACKET *pkt, int tag);
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