1//
2//  der_null.c
3//  utilities
4//
5//  Created by Josh Osborne on 4/30/13.
6//  Copyright (c) 2013 Apple Inc. All rights reserved.
7//
8
9#include <stdio.h>
10
11#include "utilities/SecCFRelease.h"
12#include "utilities/der_plist.h"
13#include "utilities/der_plist_internal.h"
14
15#include <corecrypto/ccder.h>
16#include <CoreFoundation/CoreFoundation.h>
17
18
19const uint8_t* der_decode_null(CFAllocatorRef allocator, CFOptionFlags mutability,
20                                  CFNullRef* nul, CFErrorRef *error,
21                                  const uint8_t* der, const uint8_t *der_end)
22{
23    if (NULL == der)
24        return NULL;
25
26    size_t payload_size = 0;
27    const uint8_t *payload = ccder_decode_tl(CCDER_NULL, &payload_size, der, der_end);
28
29	if (NULL == payload || payload_size != 0) {
30        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown null encoding"), NULL, error);
31        return NULL;
32    }
33
34    *nul = kCFNull;
35
36    return payload + payload_size;
37}
38
39
40size_t der_sizeof_null(CFNullRef data __unused, CFErrorRef *error)
41{
42    return ccder_sizeof(CCDER_NULL, 0);
43}
44
45
46uint8_t* der_encode_null(CFNullRef boolean __unused, CFErrorRef *error,
47                            const uint8_t *der, uint8_t *der_end)
48{
49	return ccder_encode_tl(CCDER_NULL, 0, der, der_end);
50}
51