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[*] Improve time based RNG failover implementation

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This commit is contained in:
Reece Wilson 2023-07-13 05:58:53 +01:00
parent 29226b8134
commit 115ee1a9ec
1 changed files with 26 additions and 24 deletions
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50
Source/RNG/AuRNGEntropy.cpp
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@ -170,47 +170,49 @@ namespace Aurora::RNG
static AuUInt32 RngTimeBased(AuUInt8 *pBuf, AuUInt32 uLen)
{
AuUInt64 t1;
int l, acc, bits, a, b, c;
int acc, bits, a, b, c;
l = uLen;
acc = a = b = c = 0;
bits = 8;
void *pASLRSeed = &RngTimeBased;
while (uLen--)
for (AU_ITERATE_N(uOffsetInByteStream, uLen))
{
while (bits--) // for each bit in byte
for (AU_ITERATE_N(uMultiplePassesForTheFunOfIt, 3))
{
do
while (bits--) // for each bit in byte
{
t1 = RngTimeClock();
while (t1 == RngTimeClock()) // spin within 1 microseconds
do
{
a ^= 1; // flip
}
t1 = RngTimeClock();
while (t1 == RngTimeClock()) // spin within 1 microseconds
{
a ^= 1; // flip
}
t1 = RngTimeClock();
while (t1 == RngTimeClock()) // spin within 1 microseconds
{
b ^= 1; // flip
t1 = RngTimeClock();
while (t1 == RngTimeClock()) // spin within 1 microseconds
{
b ^= 1; // flip
}
}
while (a == b); // ensure theres enough entropy for a deviation to occur
acc = (acc << 1) | a; // push the first bit state
}
while (a == b); // ensure theres enough entropy for a deviation to occur
acc = (acc << 1) | a; // push the first bit state
acc = 0;
bits = 8;
c = AuFnv1a32Runtime(&acc, sizeof(acc)) ^
(AuFnv1a32Runtime(&c, sizeof(c)) * kFnv1MagicPrime32) ^
(a ? AuFnv1a32Runtime(&pASLRSeed, sizeof(pASLRSeed)) : 0);
}
*pBuf = AuFnv1a32Runtime(&acc, sizeof(acc)) ^
AuFnv1a32Runtime(&c, sizeof(c)) ^
AuFnv1a32Runtime(&pASLRSeed, sizeof(pASLRSeed));
c = *pBuf++;
acc = 0;
bits = 8;
*pBuf++ = AuUInt8(c);
}
return l;
return uLen;
}
AuUInt32 RngGetBytes(AuUInt8 *pBuffer, AuUInt32 uBytes)