OSX/utilities/der_null.c

   1 /*
   2  * Copyright (c) 2013-2014 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_null(CFAllocatorRef allocator,
  36                                   CFNullRef* nul, 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_NULL, &payload_size, der, der_end);
  46
  47         if (NULL == payload || payload_size != 0) {
  48         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown null encoding"), NULL, error);
  49         return NULL;
  50     }
  51
  52     *nul = kCFNull;
  53
  54     return payload + payload_size;
  55 }
  56
  57
  58 size_t der_sizeof_null(CFNullRef data __unused, CFErrorRef *error)
  59 {
  60     return ccder_sizeof(CCDER_NULL, 0);
  61 }
  62
  63
  64 uint8_t* der_encode_null(CFNullRef boolean __unused, CFErrorRef *error,
  65                             const uint8_t *der, uint8_t *der_end)
  66 {
  67         return SecCCDEREncodeHandleResult(ccder_encode_tl(CCDER_NULL, 0, der, der_end),
  68                                       error);
  69 }