minizip/aes/entropy.c at dev · inequation/minizip

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#ifdef _WIN32

#include <windows.h>

#else

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#endif

#if defined(__cplusplus)

extern "C"

{

#endif

#ifdef _WIN32

int entropy_fun(unsigned char buf[], unsigned int len)

{

HCRYPTPROV provider;

unsigned __int64 pentium_tsc[1];

unsigned int i;

int result = 0;

if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))

{

result = CryptGenRandom(provider, len, buf);

CryptReleaseContext(provider, 0);

if (result)

return len;

}

QueryPerformanceCounter((LARGE_INTEGER *)pentium_tsc);

for(i = 0; i < 8 && i < len; ++i)

buf[i] = ((unsigned char*)pentium_tsc)[i];

return i;

}

#else

int entropy_fun(unsigned char buf[], unsigned int len)

{

int frand = open("/dev/urandom", O_RDONLY);

int rlen = 0;

if (frand != -1)

{

rlen = (int)read(frand, buf, len);

close(frand);

}

return rlen;

}

#endif

#if defined(__cplusplus)

}

#endif

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