1//
2//  der_data.c
3//  utilities
4//
5//  Created by Mitch Adler on 6/18/12.
6//  Copyright (c) 2012 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_data_mutable(CFAllocatorRef allocator, CFOptionFlags mutability,
20                                       CFMutableDataRef* data, 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_OCTET_STRING, &payload_size, der, der_end);
28
29    if (NULL == payload || (der_end - payload) < payload_size) {
30        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding"), NULL, error);
31        return NULL;
32    }
33
34    *data = CFDataCreateMutable(allocator, 0);
35
36    if (NULL == *data) {
37        SecCFDERCreateError(kSecDERErrorUnderlyingError, CFSTR("Failed to create data"), NULL, error);
38        return NULL;
39    }
40
41    CFDataAppendBytes(*data, payload, payload_size);
42
43    return payload + payload_size;
44}
45
46
47const uint8_t* der_decode_data(CFAllocatorRef allocator, CFOptionFlags mutability,
48                               CFDataRef* data, CFErrorRef *error,
49                               const uint8_t* der, const uint8_t *der_end)
50{
51    if (NULL == der)
52        return NULL;
53
54    size_t payload_size = 0;
55    const uint8_t *payload = ccder_decode_tl(CCDER_OCTET_STRING, &payload_size, der, der_end);
56
57    if (NULL == payload || (der_end - payload) < payload_size) {
58        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding"), NULL, error);
59        return NULL;
60    }
61
62    *data = CFDataCreate(allocator, payload, payload_size);
63
64    if (NULL == *data) {
65        SecCFDERCreateError(kSecDERErrorUnderlyingError, CFSTR("Failed to create data"), NULL, error);
66        return NULL;
67    }
68
69    return payload + payload_size;
70}
71
72
73size_t der_sizeof_data(CFDataRef data, CFErrorRef *error)
74{
75    return ccder_sizeof_raw_octet_string(CFDataGetLength(data));
76}
77
78
79uint8_t* der_encode_data(CFDataRef data, CFErrorRef *error,
80                         const uint8_t *der, uint8_t *der_end)
81{
82    const CFIndex data_length = CFDataGetLength(data);
83
84    return ccder_encode_tl(CCDER_OCTET_STRING, data_length, der,
85           ccder_encode_body(data_length, CFDataGetBytePtr(data), der, der_end));
86
87}
88