66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
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static int os_get_random(unsigned char *buf, size_t len)
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{
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int i, j;
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unsigned long tmp;
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for (i = 0; i < ((len + 3) & ~3) / 4; i++)
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{
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tmp = rand();
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for (j = 0; j < 4; j++)
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{
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if ((i * 4 + j) < len)
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{
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buf[i * 4 + j] = (unsigned char)(tmp >> (j * 8));
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}
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else
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{
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break;
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}
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}
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}
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return 0;
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}
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int mbedtls_hardware_poll( void *data, unsigned char *output, size_t len, size_t *olen )
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{
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os_get_random(output, len);
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*olen = len;
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return 0;
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}
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#endif
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