utilities/src/der_null.c

   1 //
   2 //  der_null.c
   3 //  utilities
   4 //
   5 //  Created by Josh Osborne on 4/30/13.
   6 //  Copyright (c) 2013 Apple Inc. All rights reserved.
   7 //
   8
   9 #include <stdio.h>
  10
  11 #include "utilities/SecCFRelease.h"
  12 #include "utilities/der_plist.h"
  13 #include "utilities/der_plist_internal.h"
  14
  15 #include <corecrypto/ccder.h>
  16 #include <CoreFoundation/CoreFoundation.h>
  17
  18
  19 const uint8_t* der_decode_null(CFAllocatorRef allocator, CFOptionFlags mutability,
  20                                   CFNullRef* nul, CFErrorRef *error,
  21                                   const uint8_t* der, const uint8_t *der_end)
  22 {
  23     if (NULL == der)
  24         return NULL;
  25
  26     size_t payload_size = 0;
  27     const uint8_t *payload = ccder_decode_tl(CCDER_NULL, &payload_size, der, der_end);
  28
  29         if (NULL == payload || payload_size != 0) {
  30         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown null encoding"), NULL, error);
  31         return NULL;
  32     }
  33
  34     *nul = kCFNull;
  35
  36     return payload + payload_size;
  37 }
  38
  39
  40 size_t der_sizeof_null(CFNullRef data __unused, CFErrorRef *error)
  41 {
  42     return ccder_sizeof(CCDER_NULL, 0);
  43 }
  44
  45
  46 uint8_t* der_encode_null(CFNullRef boolean __unused, CFErrorRef *error,
  47                             const uint8_t *der, uint8_t *der_end)
  48 {
  49         return ccder_encode_tl(CCDER_NULL, 0, der, der_end);
  50 }