OSX/utilities/der_data.c

   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_mutable(CFAllocatorRef allocator, CFOptionFlags mutability,
  36                                        CFMutableDataRef* data, CFErrorRef *error,
  37                                        const uint8_t* der, const uint8_t *der_end)
  38 {
  39     if (NULL == der)
  40         return NULL;
  41
  42     size_t payload_size = 0;
  43     const uint8_t *payload = ccder_decode_tl(CCDER_OCTET_STRING, &payload_size, der, der_end);
  44
  45     if (NULL == payload || (ssize_t) (der_end - payload) < (ssize_t) payload_size) {
  46         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding"), NULL, error);
  47         return NULL;
  48     }
  49
  50     *data = CFDataCreateMutable(allocator, 0);
  51
  52     if (NULL == *data) {
  53         SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create data"), NULL, error);
  54         return NULL;
  55     }
  56
  57     CFDataAppendBytes(*data, payload, payload_size);
  58
  59     return payload + payload_size;
  60 }
  61
  62
  63 const uint8_t* der_decode_data(CFAllocatorRef allocator, CFOptionFlags mutability,
  64                                CFDataRef* data, CFErrorRef *error,
  65                                const uint8_t* der, const uint8_t *der_end)
  66 {
  67     if (NULL == der)
  68         return NULL;
  69
  70     size_t payload_size = 0;
  71     const uint8_t *payload = ccder_decode_tl(CCDER_OCTET_STRING, &payload_size, der, der_end);
  72
  73     if (NULL == payload || (ssize_t) (der_end - payload) < (ssize_t) payload_size) {
  74         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding"), NULL, error);
  75         return NULL;
  76     }
  77
  78     *data = CFDataCreate(allocator, payload, payload_size);
  79
  80     if (NULL == *data) {
  81         SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create data"), NULL, error);
  82         return NULL;
  83     }
  84
  85     return payload + payload_size;
  86 }
  87
  88
  89 size_t der_sizeof_data(CFDataRef data, CFErrorRef *error)
  90 {
  91     return ccder_sizeof_raw_octet_string(CFDataGetLength(data));
  92 }
  93
  94
  95 uint8_t* der_encode_data(CFDataRef data, CFErrorRef *error,
  96                          const uint8_t *der, uint8_t *der_end)
  97 {
  98     const CFIndex data_length = CFDataGetLength(data);
  99
 100     return ccder_encode_tl(CCDER_OCTET_STRING, data_length, der,
 101            ccder_encode_body(data_length, CFDataGetBytePtr(data), der, der_end));
 102
 103 }