46 lines
966 B
C
46 lines
966 B
C
#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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/**
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* \brief Entropy poll callback for a hardware source
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*
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* \warning This is not provided by mbed TLS!
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* See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
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*
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* \note This must accept NULL as its first argument.
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*/
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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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tmp = rand();
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for (j = 0; j < 4; j ++){
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if ((i * 4 + j) < len){
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buf[i * 4 + j] = (unsigned char)(tmp >> (j * 8));
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}else{
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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,
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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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