OSX/utilities/SecSCTUtils.c

   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 }