49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
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/*
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* Copyright (c) 2022 Rockchip Electronics Co. Ltd.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "rkcrypto_random.h"
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#define RAND_MAX_LEN 1024 * 1024
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static unsigned int hamming_weight8(uint8_t w)
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{
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unsigned int res = w - ((w >> 1) & 0x55);
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res = (res & 0x33) + ((res >> 2) & 0x33);
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return (res + (res >> 4)) & 0x0F;
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}
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RK_RES test_random(void)
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{
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uint32_t len, hw, i;
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uint8_t data[RAND_MAX_LEN];
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for (len = 8; len <= RAND_MAX_LEN; len *= 2) {
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if (rk_get_random(data, len))
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goto error;
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hw = 0;
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for (i = 0; i < len; i++) {
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hw += hamming_weight8(data[i]);
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}
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/*
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* With sufficient length (>= 8 bytes), the hamming weight of
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* every 8 bits should stay between 1 and 7 on average.
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*/
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if (hw < len || hw > (len * 8 - len)) {
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printf("Get random %d bits, hamming_weight is %d.\n", len * 8, hw);
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goto error;
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}
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}
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printf("TEST get random function SUCCESS.\n");
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printf("NOTE: Testing for calling rk_get_random API. No testing for randomness/unpredictability.\n");
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return RK_CRYPTO_SUCCESS;
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error:
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printf("TEST get random function FAILED!!!\n");
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return RK_CRYPTO_ERR_GENERIC;
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}
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