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libsodium/test/randombytes.c

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#include "randombytes.h"
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unsigned char x[65536];
unsigned long long freq[256];
int main(void)
{
unsigned long long i;
randombytes(x,sizeof x);
for (i = 0;i < 256;++i) freq[i] = 0;
for (i = 0;i < sizeof x;++i) ++freq[255 & (int) x[i]];
for (i = 0;i < 256;++i) if (!freq[i]) return 111;
return 0;
}