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[*] i was taking a shit when i remembered our hashcash algorithm is fundamentally borked

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This commit is contained in:
Reece Wilson 2023-05-20 02:38:47 +01:00
parent b7de15d78e
commit 824602b1fa
1 changed files with 67 additions and 30 deletions
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97
Source/Crypto/HashCash/HashCash.cpp
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@ -12,50 +12,87 @@ namespace Aurora::Crypto::HashCash
{
AUKN_SYM bool CheckSalt(AuUInt64 token, AuUInt8 power, const HashCashAnswer &answer)
{
AuUInt8 count {};
AuArray<AuUInt8, 16> hashBuffer;
struct Hash
for (AU_ITERATE_N(i, 2))
{
AuUInt64 token;
AuUInt64 y;
} hash;
static_assert(sizeof(Hash) == 16);
AuUInt64 uCoefficient {};
hash.token = token;
hash.y = answer.y;
AuArray<AuUInt8, 16> hashBuffer;
if (i == 0)
{
AuHashing::RMD128(AuMemoryViewRead(&token, sizeof(token)), hashBuffer);
uCoefficient = answer.y & 0xFFFFFFFF;
}
else
{
AuHashing::RMD128(AuMemoryViewRead(&token, sizeof(token)), hashBuffer);
AuHashing::RMD128(AuMemoryViewRead(hashBuffer.data(), hashBuffer.size()), hashBuffer);
uCoefficient = (answer.y >> 32) & 0xFFFFFFFF;
}
AuHashing::RMD128(AuMemoryViewRead(&hash, 16), hashBuffer);
AuBitScanForward(count, AuReadU64LE(hashBuffer.data(), 0));
return count == power;
AuWriteU64LE(hashBuffer.data(),
hashBuffer.size() - 8,
AuReadU64LE(hashBuffer.data(), hashBuffer.size() - 8) + uCoefficient);
AuHashing::RMD128(AuMemoryViewRead(hashBuffer.data(), hashBuffer.size()), hashBuffer);
AuUInt8 count {};
AuBitScanForward(count, AuReadU64LE(hashBuffer.data(), 0));
if (count != power)
{
return false;
}
}
return true;
}
AUKN_SYM HashCashAnswer FindAnswer(AuUInt64 token, AuUInt8 power)
{
HashCashAnswer answer;
HashCashAnswer answer {};
AuArray<AuUInt8, 16> refBuffer;
AuArray<AuUInt8, 16> rollingBuffer;
AuArray<AuUInt8, 16> hashBuffer;
struct Hash
for (AU_ITERATE_N(i, 2))
{
AuUInt64 token;
AuUInt64 y;
} hash;
static_assert(sizeof(Hash) == 16);
if (i == 0)
{
AuHashing::RMD128(AuMemoryViewRead(&token, sizeof(token)), refBuffer);
}
else
{
AuHashing::RMD128(AuMemoryViewRead(&token, sizeof(token)), refBuffer);
AuHashing::RMD128(AuMemoryViewRead(refBuffer.data(), refBuffer.size()), refBuffer);
}
hash.token = token;
hash.y = AuRng::RngU64();
AuUInt64 uTicks {};
AuUInt8 count {};
do
{
rollingBuffer = refBuffer;
AuUInt8 count {};
do
{
hash.y++;
AuHashing::RMD128(AuMemoryViewRead(&hash, 16), hashBuffer);
AuWriteU64LE(rollingBuffer.data(),
rollingBuffer.size() - 8,
AuReadU64LE(rollingBuffer.data(), rollingBuffer.size() - 8) + (uTicks++));
AuHashing::RMD128(AuMemoryViewRead(rollingBuffer.data(), rollingBuffer.size()),
hashBuffer);
}
while (AuBitScanForward(count, AuReadU64LE(hashBuffer.data(), 0)), count != power);
uTicks--;
if (i == 0)
{
answer.y = uTicks;
}
else
{
answer.y |= uTicks << 32;
}
}
while (AuBitScanForward(count, AuReadU64LE(hashBuffer.data(), 0)), count != power);
answer.y = hash.y;
return answer;
}
}