der_array.c   [plain text]

/*
 * Copyright (c) 2012,2014 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 "utilities/SecCFRelease.h"
#include "utilities/der_plist.h"
#include "utilities/der_plist_internal.h"

#include <corecrypto/ccder.h>
#include <CoreFoundation/CoreFoundation.h>


const uint8_t* der_decode_array(CFAllocatorRef allocator,
                                CFArrayRef* array, CFErrorRef *error,
                                const uint8_t* der, const uint8_t *der_end)
{
    if (NULL == der) {
        SecCFDERCreateError(kSecDERErrorNullInput, CFSTR("null input"), NULL, error);
        return NULL;
    }

    CFMutableArrayRef result = CFArrayCreateMutable(allocator, 0, &kCFTypeArrayCallBacks);

    const uint8_t *elements_end;
    const uint8_t *current_element = ccder_decode_sequence_tl(&elements_end, der, der_end);
    if (!current_element) {
        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("tag/length decode failed"), NULL, error);
    }
    
    while (current_element != NULL && current_element < elements_end) {
        CFPropertyListRef element = NULL;
        current_element = der_decode_plist(allocator, &element, error, current_element, elements_end);
        if (current_element) {
            CFArrayAppendValue(result, element);
            CFReleaseNull(element);
        }
    }

    if (current_element) {
        *array = result;
        result = NULL;
    }

    CFReleaseNull(result);
    return current_element;
}


size_t der_sizeof_array(CFArrayRef data, CFErrorRef *error)
{
    size_t body_size = 0;
    for(CFIndex position = CFArrayGetCount(data) - 1;
        position >= 0;
        --position)
    {
        body_size += der_sizeof_plist(CFArrayGetValueAtIndex(data, position), error);
    }
    return ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE, body_size);
}


uint8_t* der_encode_array(CFArrayRef array, CFErrorRef *error,
                          const uint8_t *der, uint8_t *der_end)
{
    return der_encode_array_repair(array, error, false, der, der_end);
}

uint8_t* der_encode_array_repair(CFArrayRef array, CFErrorRef *error,
                                 bool repair,
                                 const uint8_t *der, uint8_t *der_end)
{
    uint8_t* original_der_end = der_end;
    for(CFIndex position = CFArrayGetCount(array) - 1;
        position >= 0;
        --position)
    {
        der_end = der_encode_plist_repair(CFArrayGetValueAtIndex(array, position), error, repair, der, der_end);
    }

    return SecCCDEREncodeHandleResult(ccder_encode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, original_der_end, der, der_end),
                                      error);
}