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_data(CFAllocatorRef allocator,
36                                 CFDataRef* data, 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_OCTET_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 data encoding"), NULL, error);
49          return NULL;
50      }
51      
52      *data = CFDataCreate(allocator, payload, payload_size);
53  
54      if (NULL == *data) {
55          SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create data"), NULL, error);
56          return NULL;
57      }
58  
59      return payload + payload_size;
60  }
61  
62  
63  size_t der_sizeof_data(CFDataRef data, CFErrorRef *error)
64  {
65      return ccder_sizeof_raw_octet_string(CFDataGetLength(data));
66  }
67  
68  
69  uint8_t* der_encode_data(CFDataRef data, CFErrorRef *error,
70                           const uint8_t *der, uint8_t *der_end)
71  {
72      const CFIndex data_length = CFDataGetLength(data);
73  
74      return SecCCDEREncodeHandleResult(ccder_encode_tl(CCDER_OCTET_STRING, data_length, der,
75                                                        ccder_encode_body(data_length, CFDataGetBytePtr(data), der, der_end)),
76                                        error);
77  
78  }