1 /*
2 // Copyright (C) 2022 Beken Corporation
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #if !defined(MBEDTLS_CONFIG_FILE)
16 #include "mbedtls/config.h"
17 #else
18 #include MBEDTLS_CONFIG_FILE
19 #endif
20
21 #include <sys/types.h>
22 #include <stdlib.h>
23 #include <stdio.h>
24
25 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
26
os_get_random(unsigned char * buf,size_t len)27 static int os_get_random(unsigned char *buf, size_t len)
28 {
29 int i, j;
30 unsigned long tmp;
31
32 for (i = 0; i < (((int)len + 3) & ~3) / 4; i++) {
33 tmp = rand();
34
35 for (j = 0; j < 4; j++) {
36 if ((i * 4 + j) < (int)len) {
37 buf[i * 4 + j] = (unsigned char)(tmp >> (j * 8));
38 } else {
39 break;
40 }
41 }
42 }
43
44 return 0;
45 }
46
mbedtls_hardware_poll(void * data,unsigned char * output,size_t len,size_t * olen)47 int mbedtls_hardware_poll( void *data,
48 unsigned char *output, size_t len, size_t *olen )
49 {
50 (void)data;
51 os_get_random(output, len);
52 *olen = len;
53
54 return 0;
55 }
56 #endif
57
58
59