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 35const uint8_t* der_decode_string(CFAllocatorRef allocator, CFOptionFlags mutability, 36 CFStringRef* string, 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_UTF8_STRING, &payload_size, der, der_end); 44 45 if (NULL == payload || (der_end - payload) < payload_size){ 46 SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown string encoding"), NULL, error); 47 return NULL; 48 } 49 50 *string = CFStringCreateWithBytes(allocator, payload, payload_size, kCFStringEncodingUTF8, false); 51 52 if (NULL == *string) { 53 SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("String allocation failed"), NULL, error); 54 return NULL; 55 } 56 57 return payload + payload_size; 58} 59 60 61size_t der_sizeof_string(CFStringRef str, CFErrorRef *error) 62{ 63 const CFIndex str_length = CFStringGetLength(str); 64 const CFIndex maximum = CFStringGetMaximumSizeForEncoding(str_length, kCFStringEncodingUTF8); 65 66 CFIndex encodedLen = 0; 67 CFIndex converted = CFStringGetBytes(str, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, NULL, maximum, &encodedLen); 68 69 return ccder_sizeof(CCDER_UTF8_STRING, (converted == str_length) ? encodedLen : 0); 70} 71 72 73uint8_t* der_encode_string(CFStringRef string, CFErrorRef *error, 74 const uint8_t *der, uint8_t *der_end) 75{ 76 // Obey the NULL allowed rules. 77 if (!der_end) 78 return NULL; 79 80 const CFIndex str_length = CFStringGetLength(string); 81 82 ptrdiff_t der_space = der_end - der; 83 CFIndex bytes_used = 0; 84 uint8_t *buffer = der_end - der_space; 85 CFIndex converted = CFStringGetBytes(string, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, buffer, der_space, &bytes_used); 86 if (converted != str_length){ 87 SecCFDERCreateError(kSecDERErrorUnsupportedCFObject, CFSTR("String extraction failed"), NULL, error); 88 return NULL; 89 } 90 91 return ccder_encode_tl(CCDER_UTF8_STRING, bytes_used, der, 92 ccder_encode_body(bytes_used, buffer, der, der_end)); 93 94} 95