198 lines
4.3 KiB
C++
198 lines
4.3 KiB
C++
/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: AuRNGEntropy.cpp
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Date: 2022-9-17
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File: RNG.cpp
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Date: 2021-6-11
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Author: Reece
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***/
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#include <Source/RuntimeInternal.hpp>
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#include "AuRNG.hpp"
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#include "AuRNGEntropy.hpp"
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#if defined(AURORA_PLATFORM_WIN32)
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#include <wincrypt.h>
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#include <bcrypt.h>
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#include <bcrypt.h>
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#endif
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#if defined(AURORA_IS_POSIX_DERIVED)
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#include <cstdio>
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#include <fcntl.h>
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#endif
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#include "AuWELL.hpp"
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namespace Aurora::RNG
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{
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#if defined(AURORA_IS_POSIX_DERIVED)
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static int gDevURand;
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void EntropyInit()
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{
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gDevURand = ::open("/dev/urandom", O_RDONLY | O_CLOEXEC);
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if (gDevURand <= 0)
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{
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gDevURand = ::open("/dev/random", O_RDONLY | O_CLOEXEC);
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}
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if (gDevURand <= 0)
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{
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gDevURand = -1;
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}
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}
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static AuUInt32 RngUnix(AuUInt8 *pBuf, AuUInt32 uLen)
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{
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if (gDevURand == -1)
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{
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return 0;
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}
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return ::read(gDevURand, pBuf, uLen);
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}
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#elif defined(AURORA_IS_MODERNNT_DERIVED)
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#if defined(USE_OLD_NTCRYPT)
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static HCRYPTPROV gCryptoProv;
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#endif
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void EntropyInit()
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{
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#if defined(USE_OLD_NTCRYPT)
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if (!CryptAcquireContext(&gCryptoProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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(CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)))
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{
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if (!CryptAcquireContext(&gCryptoProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
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{
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gCryptoProv = 0;
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}
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}
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#endif
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}
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static AuUInt32 RngWin32(AuUInt8 *pBuf, AuUInt32 uLen)
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{
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#if defined(USE_OLD_NTCRYPT)
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if (!gCryptoProv)
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{
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return 0;
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}
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if (!::CryptGenRandom(gCryptoProv, uLen, pBuf))
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{
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return 0;
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}
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return uLen;
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#else
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#if !defined(AURORA_DONT_PREFER_WIN32_USERLAND_AES_RNG)
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#if !defined(BCRYPT_RNG_ALG_HANDLE)
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#define BCRYPT_RNG_ALG_HANDLE ((BCRYPT_ALG_HANDLE) 0x00000081)
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#endif
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if (AuSwInfo::IsWindows10OrGreater() &&
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::BCryptGenRandom(BCRYPT_RNG_ALG_HANDLE, reinterpret_cast<PUCHAR>(pBuf), uLen, 0) == 0)
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{
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return uLen;
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}
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#endif
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if (::BCryptGenRandom(NULL, reinterpret_cast<PUCHAR>(pBuf), uLen, BCRYPT_USE_SYSTEM_PREFERRED_RNG) == 0)
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{
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return uLen;
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}
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return 0;
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#endif
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}
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#else
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void EntropyInit()
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{
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}
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#endif
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static AuUInt32 RngStdC(AuUInt8 *pBuf, AuUInt32 uLen)
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{
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clock_t t1;
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int l, acc, bits, a, b;
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l = uLen;
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acc = a = b = 0;
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bits = 8;
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while (uLen--)
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{
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while (bits--) // for each bit in byte
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{
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do
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{
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t1 = clock();
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while (t1 == clock()) // spin within the resolution of 1 C clock() tick
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{
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a ^= 1; // flip
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}
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t1 = clock();
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while (t1 == clock())
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{
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b ^= 1; // flip
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}
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} while (a == b); // ensure theres enough entropy for a deviation to occur
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acc = (acc << 1) | a; // push the first bit state
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}
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*pBuf++ = acc;
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acc = 0;
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bits = 8;
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}
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return l;
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}
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AuUInt32 RngGetBytes(AuUInt8 *pBuffer, AuUInt32 uBytes)
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{
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AuUInt32 x;
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#if defined(AURORA_IS_MODERNNT_DERIVED)
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x = RngWin32(pBuffer, uBytes);
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if (x != 0)
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{
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return x;
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}
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#elif defined(AURORA_IS_POSIX_DERIVED)
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x = RngUnix(pBuffer, uBytes);
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if (x != 0)
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{
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return x;
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}
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#endif
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x = RngStdC(pBuffer, uBytes);
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if (x != 0)
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{
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return x;
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}
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return 0;
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}
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void EntropyDeinit()
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{
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#if defined(AURORA_IS_POSIX_DERIVED)
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if (gDevURand <= 0)
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{
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::close(gDevURand);
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}
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#elif defined(AURORA_IS_MODERNNT_DERIVED) && defined(USE_OLD_NTCRYPT)
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CryptReleaseContext(gCryptoProv, 0);
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#endif
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}
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} |