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/*
* Copyright (c) 2005-2007,2011,2013-2014 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* DER_Encode.h - DER encoding routines
*
*/
#ifndef _DER_ENCODE_H_
#define _DER_ENCODE_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <libDER/libDER.h>
/*
* Max size of an encoded item given its length.
* This includes a possible leading zero prepended to a signed integer
* (see DER_ENC_SIGNED_INT below).
*/
#define DER_MAX_ENCODED_SIZE(len) \
( 1 + /* tag */ \
5 + /* max length */ \
1 + /* possible prepended zero */ \
len)
/* calculate size of encoded length */
DERSize DERLengthOfLength(
DERSize length);
/* encode length */
DERReturn DEREncodeLength(
DERSize length,
DERByte *buf, /* encoded length goes here */
DERSize *inOutLen); /* IN/OUT */
/* calculate size of encoded length */
DERSize DERLengthOfItem(
DERTag tag,
DERSize length);
/* encode item */
DERReturn DEREncodeItem(
DERTag tag,
DERSize length,
const DERByte *src,
DERByte *derOut, /* encoded item goes here */
DERSize *inOutLen); /* IN/OUT */
/*
* Per-item encode options.
*/
/* explicit default, no options */
#define DER_ENC_NO_OPTS 0x0000
/* signed integer check: if incoming m.s. bit is 1, prepend a zero */
#define DER_ENC_SIGNED_INT 0x0100
/* DERItem contains fully encoded item - copy, don't encode */
#define DER_ENC_WRITE_DER 0x0200
/*
* High-level sequence or set encode support.
*
* The outgoing sequence is expressed as an array of DERItemSpecs, each
* of which corresponds to one item in the encoded sequence.
*
* Normally the tag of the encoded item comes from the associated
* DERItemSpec, and the content comes from the DERItem whose address is
* the src arg plus the offset value in the associated DERItemSpec.
*
* If the DER_ENC_WRITE_DER option is true for a given DERItemSpec then
* no per-item encoding is done; the DER - with tag, length, and content -
* is taken en masse from the associated DERItem.
*/
DERReturn DEREncodeSequence(
DERTag topTag, /* ASN1_CONSTR_SEQUENCE, ASN1_CONSTR_SET */
const void *src, /* generally a ptr to a struct full of
* DERItems */
DERShort numItems, /* size of itemSpecs[] */
const DERItemSpec *itemSpecs,
DERByte *derOut, /* encoded data written here */
DERSize *inOutLen); /* IN/OUT */
/* precalculate the length of an encoded sequence. */
DERSize DERLengthOfEncodedSequence(
DERTag topTag, /* ASN1_CONSTR_SEQUENCE, ASN1_CONSTR_SET */
const void *src, /* generally a ptr to a struct full of
* DERItems */
DERShort numItems, /* size of itemSpecs[] */
const DERItemSpec *itemSpecs);
#ifdef __cplusplus
}
#endif
#endif /* _DER_ENCODE_H_ */
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