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 19const 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 40size_t der_sizeof_null(CFNullRef data __unused, CFErrorRef *error) 41{ 42 return ccder_sizeof(CCDER_NULL, 0); 43} 44 45 46uint8_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} 51