189 lines
4.3 KiB
C++
189 lines
4.3 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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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 <RuntimeInternal.hpp>
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#include "RNG.hpp"
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#if defined(AURORA_PLATFORM_WIN32)
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#include <wincrypt.h>
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#endif
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namespace Aurora::RNG
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{
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#if (defined(AURORA_PLATFORM_LINUX) || defined(AURORA_PLATFORM_ANDRIOD) || defined(AURORA_PLATFORM_BSD) || defined(VENDOR_CONSOLE_SONY) || defined(VENDOR_CONSOLE_NINTENDO))
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#define _UNIX_LIKE_DEVRAND
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#endif
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#if defined(_UNIX_LIKE_DEVRAND)
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static FILE *gDevURand;
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static void InitRandPlatform()
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{
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gDevURand = fopen("/dev/urandom", "rb");
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if (gDevURand == NULL)
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{
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gDevURand = fopen("/dev/random", "rb");
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}
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if (!gDevURand) return;
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if (setvbuf(gDevURand, NULL, _IONBF, 0) != 0)
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{
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fclose(gDevURand);
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gDevURand = NULL;
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}
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}
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static unsigned long RngUnix(AuUInt8 *buf, unsigned long len)
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{
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return fread(buf, 1, (size_t)len, gDevURand);
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}
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#elif defined(AURORA_PLATFORM_WIN32)
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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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static void InitRandPlatform()
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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 unsigned long RngWin32(AuUInt8 *buf, unsigned long len)
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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, len, buf))
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{
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return 0;
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}
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return len;
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#else
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#if !defined(AURORA_DONT_PREFER_WIN32_USERLAND_AES_RNG)
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if (BCryptGenRandom(BCRYPT_RNG_ALG_HANDLE, reinterpret_cast<PUCHAR>(buf), len, 0) == 0)
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{
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return len;
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}
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#endif
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if (BCryptGenRandom(NULL, reinterpret_cast<PUCHAR>(buf), len, BCRYPT_USE_SYSTEM_PREFERRED_RNG) == 0)
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{
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return len;
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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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static void InitRandPlatform()
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{
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}
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#endif
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static unsigned long RngStdC(AuUInt8 *buf, unsigned long len)
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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 = len;
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acc = a = b = 0;
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bits = 8;
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while (len--)
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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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*buf++ = 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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static unsigned long RngGetBytes(AuUInt8 *out, unsigned long outlen)
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{
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unsigned long x;
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#if defined(AURORA_PLATFORM_WIN32)
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x = RngWin32(out, outlen);
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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(_UNIX_LIKE_DEVRAND)
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x = RngUnix(out, outlen);
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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(out, outlen);
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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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AUKN_SYM void ReadSecureRNG(void *in, AuUInt length)
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{
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auto bytes = RngGetBytes(reinterpret_cast<AuUInt8 *>(in), length);
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SysAssertExp(bytes == length, "Couldn't consume {} RNG bytes", length);
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}
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void Init()
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{
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InitRandPlatform();
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}
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void Release()
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{
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#if defined(_UNIX_LIKE_DEVRAND)
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fclose(gDevURand);
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#elif defined(AURORA_PLATFORM_WIN32) && defined(USE_OLD_NTCRYPT)
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CryptReleaseContext(gCryptoProv, 0);
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#endif
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}
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} |