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  
35  const uint8_t* der_decode_string(CFAllocatorRef allocator,
36                                   CFStringRef* string, CFErrorRef *error,
37                                   const uint8_t* der, const uint8_t *der_end)
38  {
39      if (NULL == der) {
40          SecCFDERCreateError(kSecDERErrorNullInput, CFSTR("null input"), NULL, error);
41          return NULL;
42      }
43  
44      size_t payload_size = 0;
45      const uint8_t *payload = ccder_decode_tl(CCDER_UTF8_STRING, &payload_size, der, der_end);
46  
47      if (NULL == payload || (ssize_t) (der_end - payload) < (ssize_t) payload_size){
48          SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown string encoding"), NULL, error);
49          return NULL;
50      }
51  
52      *string = CFStringCreateWithBytes(allocator, payload, payload_size, kCFStringEncodingUTF8, false);
53  
54      if (NULL == *string) {
55          SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("String allocation failed"), NULL, error);
56          return NULL;
57      }
58  
59      return payload + payload_size;
60  }
61  
62  
63  size_t der_sizeof_string(CFStringRef str, CFErrorRef *error)
64  {
65      const CFIndex str_length    = CFStringGetLength(str);
66      const CFIndex maximum       = CFStringGetMaximumSizeForEncoding(str_length, kCFStringEncodingUTF8);
67  
68      CFIndex encodedLen = 0;
69      CFIndex converted = CFStringGetBytes(str, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, NULL, maximum, &encodedLen);
70  
71      return ccder_sizeof(CCDER_UTF8_STRING, (converted == str_length) ? encodedLen : 0);
72  }
73  
74  
75  uint8_t* der_encode_string(CFStringRef string, CFErrorRef *error,
76                             const uint8_t *der, uint8_t *der_end)
77  {
78      if (NULL == der_end) {
79          SecCFDERCreateError(kSecDERErrorNullInput, CFSTR("null input"), NULL, error);
80          return NULL;
81      }
82  
83      const CFIndex str_length = CFStringGetLength(string);
84  
85      ptrdiff_t der_space = der_end - der;
86      CFIndex bytes_used = 0;
87      uint8_t *buffer = der_end - der_space;
88      CFIndex converted = CFStringGetBytes(string, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, buffer, der_space, &bytes_used);
89      if (converted != str_length){
90          SecCFDERCreateError(kSecDERErrorUnsupportedCFObject, CFSTR("String extraction failed"), NULL, error);
91          return NULL;
92      }
93  
94      return SecCCDEREncodeHandleResult(ccder_encode_tl(CCDER_UTF8_STRING, bytes_used, der,
95                                                        ccder_encode_body(bytes_used, buffer, der, der_end)),
96                                        error);
97  
98  }