1  //
 2  //  SecSCTUtils.c
 3  //  utilities
 4  /*
 5   * Copyright (c) 2015 Apple Inc. All Rights Reserved.
 6   *
 7   * @APPLE_LICENSE_HEADER_START@
 8   *
 9   * This file contains Original Code and/or Modifications of Original Code
10   * as defined in and that are subject to the Apple Public Source License
11   * Version 2.0 (the 'License'). You may not use this file except in
12   * compliance with the License. Please obtain a copy of the License at
13   * http://www.opensource.apple.com/apsl/ and read it before using this
14   * file.
15   *
16   * The Original Code and all software distributed under the License are
17   * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
18   * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
19   * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
21   * Please see the License for the specific language governing rights and
22   * limitations under the License.
23   *
24   * @APPLE_LICENSE_HEADER_END@
25   */
26  
27  #include <AssertMacros.h>
28  #include <utilities/SecCFWrappers.h>
29  #include "SecSCTUtils.h"
30  
31  static size_t SSLDecodeSize(const uint8_t *p)
32  {
33      return (p[0]<<8 | p[1]);
34  }
35  
36  CFArrayRef SecCreateSignedCertificateTimestampsArrayFromSerializedSCTList(const uint8_t *p, size_t listLen)
37  {
38      size_t encodedListLen;
39      CFMutableArrayRef sctArray = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
40      require_quiet(sctArray, out);
41  
42      require(listLen > 2 , out);
43      encodedListLen = SSLDecodeSize(p); p+=2; listLen-=2;
44  
45      require(encodedListLen==listLen, out);
46  
47      while (listLen > 0)
48      {
49          size_t itemLen;
50          require(listLen >= 2, out);
51          itemLen = SSLDecodeSize(p); p += 2; listLen-=2;
52          require(itemLen <= listLen, out);
53          CFDataRef sctData = CFDataCreate(kCFAllocatorDefault, p, itemLen);
54          p += itemLen; listLen -= itemLen;
55          require(sctData, out);
56          CFArrayAppendValue(sctArray, sctData);
57          CFReleaseSafe(sctData);
58      }
59  
60      return sctArray;
61  
62  out:
63      CFReleaseSafe(sctArray);
64      return NULL;
65  }