1/*
2 * Copyright (c) 2012,2014 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24
25#include <stdio.h>
26
27#include "utilities/SecCFRelease.h"
28#include "utilities/der_plist.h"
29#include "utilities/der_plist_internal.h"
30
31#include <corecrypto/ccder.h>
32#include <CoreFoundation/CoreFoundation.h>
33
34
35const uint8_t* der_decode_string(CFAllocatorRef allocator, CFOptionFlags mutability,
36                                 CFStringRef* string, CFErrorRef *error,
37                                 const uint8_t* der, const uint8_t *der_end)
38{
39    if (NULL == der)
40        return NULL;
41
42    size_t payload_size = 0;
43    const uint8_t *payload = ccder_decode_tl(CCDER_UTF8_STRING, &payload_size, der, der_end);
44
45    if (NULL == payload || (der_end - payload) < payload_size){
46        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown string encoding"), NULL, error);
47        return NULL;
48    }
49
50    *string = CFStringCreateWithBytes(allocator, payload, payload_size, kCFStringEncodingUTF8, false);
51
52    if (NULL == *string) {
53        SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("String allocation failed"), NULL, error);
54        return NULL;
55    }
56
57    return payload + payload_size;
58}
59
60
61size_t der_sizeof_string(CFStringRef str, CFErrorRef *error)
62{
63    const CFIndex str_length    = CFStringGetLength(str);
64    const CFIndex maximum       = CFStringGetMaximumSizeForEncoding(str_length, kCFStringEncodingUTF8);
65
66    CFIndex encodedLen = 0;
67    CFIndex converted = CFStringGetBytes(str, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, NULL, maximum, &encodedLen);
68
69    return ccder_sizeof(CCDER_UTF8_STRING, (converted == str_length) ? encodedLen : 0);
70}
71
72
73uint8_t* der_encode_string(CFStringRef string, CFErrorRef *error,
74                           const uint8_t *der, uint8_t *der_end)
75{
76    // Obey the NULL allowed rules.
77    if (!der_end)
78        return NULL;
79
80    const CFIndex str_length = CFStringGetLength(string);
81
82    ptrdiff_t der_space = der_end - der;
83    CFIndex bytes_used = 0;
84    uint8_t *buffer = der_end - der_space;
85    CFIndex converted = CFStringGetBytes(string, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, buffer, der_space, &bytes_used);
86    if (converted != str_length){
87        SecCFDERCreateError(kSecDERErrorUnsupportedCFObject, CFSTR("String extraction failed"), NULL, error);
88        return NULL;
89    }
90
91    return ccder_encode_tl(CCDER_UTF8_STRING, bytes_used, der,
92           ccder_encode_body(bytes_used, buffer, der, der_end));
93
94}
95