-/*
- * Copyright (c) 2015 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-
-#include <stdio.h>
-#include "der_set.h"
-
-#include "utilities/SecCFRelease.h"
-#include "utilities/der_plist.h"
-#include "utilities/der_plist_internal.h"
-#include "utilities/SecCFWrappers.h"
-
-#include <corecrypto/ccder.h>
-#include <CoreFoundation/CoreFoundation.h>
-
-const uint8_t* der_decode_set(CFAllocatorRef allocator, CFOptionFlags mutability,
- CFSetRef* set, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end)
-{
- if (NULL == der)
- return NULL;
-
- const uint8_t *payload_end = 0;
- const uint8_t *payload = ccder_decode_constructed_tl(CCDER_CONSTRUCTED_CFSET, &payload_end, der, der_end);
-
- if (NULL == payload) {
- SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding, expected CCDER_CONSTRUCTED_CFSET"), NULL, error);
- return NULL;
- }
-
- CFMutableSetRef theSet = (set && *set) ? CFSetCreateMutableCopy(allocator, 0, *set)
- : CFSetCreateMutable(allocator, 0, &kCFTypeSetCallBacks);
-
- if (NULL == theSet) {
- SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create set"), NULL, error);
- payload = NULL;
- goto exit;
- }
-
- while (payload != NULL && payload < payload_end) {
- CFTypeRef value = NULL;
-
- payload = der_decode_plist(allocator, mutability, &value, error, payload, payload_end);
-
- if (payload) {
- CFSetAddValue(theSet, value);
- }
- CFReleaseNull(value);
- }
-
-
-exit:
- if (payload == payload_end && set) {
- CFTransferRetained(*set, theSet);
- }
-
- CFReleaseNull(theSet);
-
- return payload;
-}
-
-struct size_context {
- bool success;
- size_t size;
- CFErrorRef *error;
-};
-
-static void add_value_size(const void *value_void, void *context_void)
-{
- CFTypeRef value = (CFTypeRef) value_void;
- struct size_context *context = (struct size_context*) context_void;
-
- if (!context->success)
- return;
-
- size_t kv_size = der_sizeof_plist(value, context->error);
- if (kv_size == 0) {
- context->success = false;
- return;
- }
-
- context->size += kv_size;
-}
-
-size_t der_sizeof_set(CFSetRef dict, CFErrorRef *error)
-{
- struct size_context context = { .success = true, .size = 0, .error = error };
-
- CFSetApplyFunction(dict, add_value_size, &context);
-
- if (!context.success)
- return 0;
-
- return ccder_sizeof(CCDER_CONSTRUCTED_CFSET, context.size);
-}
-
-struct encode_context {
- bool success;
- CFErrorRef * error;
- CFMutableArrayRef list;
- CFAllocatorRef allocator;
-};
-
-static void add_sequence_to_array(const void *value_void, void *context_void)
-{
- struct encode_context *context = (struct encode_context *) context_void;
- if (context->success) {
- size_t der_size = der_sizeof_plist(value_void, context->error);
- if (der_size == 0) {
- context-> success = false;
- } else {
- CFMutableDataRef value = CFDataCreateMutable(context->allocator, der_size);
- CFDataSetLength(value, der_size);
-
- uint8_t* const encode_begin = CFDataGetMutableBytePtr(value);
- uint8_t *encode_end = encode_begin + der_size;
-
- encode_end = der_encode_plist(value_void, context->error, encode_begin, encode_end);
-
- if (encode_end != NULL) {
- CFDataDeleteBytes(value, CFRangeMake(0, (encode_end - encode_begin)));
- CFArrayAppendValue(context->list, value);
- } else {
- context-> success = false;
- }
- CFReleaseNull(value);
- }
- }
-}
-
-static CFComparisonResult cfdata_compare_contents(const void *val1, const void *val2, void *context __unused)
-{
- return CFDataCompare((CFDataRef) val1, (CFDataRef) val2);
-}
-
-
-uint8_t* der_encode_set(CFSetRef set, CFErrorRef *error,
- const uint8_t *der, uint8_t *der_end)
-{
- CFMutableArrayRef elements = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
-
- struct encode_context context = { .success = true, .error = error, .list = elements };
- CFSetApplyFunction(set, add_sequence_to_array, &context);
-
- if (!context.success) {
- CFReleaseNull(elements);
- return NULL;
- }
-
- CFRange allOfThem = CFRangeMake(0, CFArrayGetCount(elements));
-
- CFArraySortValues(elements, allOfThem, cfdata_compare_contents, NULL);
-
- uint8_t* original_der_end = der_end;
-
- for(CFIndex position = CFArrayGetCount(elements); position > 0;) {
- --position;
- CFDataRef data = CFArrayGetValueAtIndex(elements, position);
- der_end = ccder_encode_body(CFDataGetLength(data), CFDataGetBytePtr(data), der, der_end);
- }
-
- CFReleaseNull(elements);
-
- return ccder_encode_constructed_tl(CCDER_CONSTRUCTED_CFSET, original_der_end, der, der_end);
-
-}