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(CFAllocatorRef allocator,
  36                                CFDataRef* data, 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_OCTET_STRING, &payload_size, der, der_end);
  46
  47     if (NULL == payload || (ssize_t) (der_end - payload) < (ssize_t) payload_size) {
  48         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding"), NULL, error);
  49         return NULL;
  50     }
  51
  52     *data = CFDataCreate(allocator, payload, payload_size);
  53
  54     if (NULL == *data) {
  55         SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create data"), NULL, error);
  56         return NULL;
  57     }
  58
  59     return payload + payload_size;
  60 }
  61
  62
  63 size_t der_sizeof_data(CFDataRef data, CFErrorRef *error)
  64 {
  65     return ccder_sizeof_raw_octet_string(CFDataGetLength(data));
  66 }
  67
  68
  69 uint8_t* der_encode_data(CFDataRef data, CFErrorRef *error,
  70                          const uint8_t *der, uint8_t *der_end)
  71 {
  72     const CFIndex data_length = CFDataGetLength(data);
  73
  74     return SecCCDEREncodeHandleResult(ccder_encode_tl(CCDER_OCTET_STRING, data_length, der,
  75                                                       ccder_encode_body(data_length, CFDataGetBytePtr(data), der, der_end)),
  76                                       error);
  77
  78 }