1/* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements.  See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License.  You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "apr.h"
18#include <rpc.h>
19#include <wincrypt.h>
20#include "apr_private.h"
21#include "apr_general.h"
22#include "apr_portable.h"
23#include "apr_arch_misc.h"
24
25
26APR_DECLARE(apr_status_t) apr_generate_random_bytes(unsigned char * buf,
27                                                    apr_size_t length)
28{
29    HCRYPTPROV hProv;
30    apr_status_t res = APR_SUCCESS;
31
32    /* 0x40 bit = CRYPT_SILENT, only introduced in more recent PSDKs
33     * and will only work for Win2K and later.
34     */
35    DWORD flags = CRYPT_VERIFYCONTEXT
36                | ((apr_os_level >= APR_WIN_2000) ? 0x40 : 0);
37
38    if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, flags)) {
39	return apr_get_os_error();
40    }
41    /* XXX: An ugly hack for Win64, randomness is such that noone should
42     * ever expect > 2^31 bytes of data at once without the prng
43     * coming to a complete halt.
44     */
45    if (!CryptGenRandom(hProv, (DWORD)length, buf)) {
46    	res = apr_get_os_error();
47    }
48    CryptReleaseContext(hProv, 0);
49    return res;
50}
51
52
53APR_DECLARE(apr_status_t) apr_os_uuid_get(unsigned char *uuid_data)
54{
55    /* Note: this call doesn't actually require CoInitialize() first
56     *
57     * XXX: we should scramble the bytes or some such to eliminate the
58     * possible misuse/abuse since uuid is based on the NIC address, and
59     * is therefore not only a uniqifier, but an identity (which might not
60     * be appropriate in all cases.
61     *
62     * Note that Win2000, XP and later no longer suffer from this problem,
63     * a scrambling fix is only needed for (apr_os_level < APR_WIN_2000)
64     */
65    if (FAILED(UuidCreate((UUID *)uuid_data))) {
66        return APR_EGENERAL;
67    }
68    return APR_SUCCESS;
69}
70