mirror of
https://gitcode.com/gh_mirrors/re/react-native-pushy.git
synced 2025-10-30 12:53:11 +08:00
55 lines
1.0 KiB
C
Executable File
55 lines
1.0 KiB
C
Executable File
#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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#ifdef _WIN32
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int entropy_fun(unsigned char buf[], unsigned int len)
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{
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HCRYPTPROV provider;
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unsigned __int64 pentium_tsc[1];
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unsigned int i;
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int result = 0;
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if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
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{
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result = CryptGenRandom(provider, len, buf);
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CryptReleaseContext(provider, 0);
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if (result)
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return len;
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}
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QueryPerformanceCounter((LARGE_INTEGER *)pentium_tsc);
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for(i = 0; i < 8 && i < len; ++i)
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buf[i] = ((unsigned char*)pentium_tsc)[i];
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return i;
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}
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#else
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int entropy_fun(unsigned char buf[], unsigned int len)
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{
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int frand = open("/dev/random", O_RDONLY);
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int rlen = 0;
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if (frand != -1)
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{
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rlen = (int)read(frand, buf, len);
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close(frand);
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}
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return rlen;
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}
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#endif
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#if defined(__cplusplus)
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}
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#endif
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