private bool IncTest(long num)
{
var b0 = new BigInteger(num);
var c0 = Mint.BigToCompact(b0);
BigInteger b1;
if (num < 0x800000)
{
b1 = new BigInteger(num + 1);
}
else
{
b1 = new BigInteger(num);
var bytes = BigInteger.Abs(b1).ToByteArray().Length;
var leftshift = 8 * (bytes - 3);
var toadd = 1 << leftshift;
b1 = BigInteger.Add(b1, new BigInteger(toadd));
}
var c1 = Mint.BigToCompact(b1);
if (c1 == c0)
{
return(false);
}
var newC1 = Mint.IncCompact(c0);
return(newC1 == c1);
}
/// <summary>
/// https://github.com/kac-/umint/blob/master/ukernel_test.go
/// </summary>
public void CheckStakeKernelHashTest()
{
var result = Mint.CheckStakeKernelHash(new MintTemplate(
"totest",
"Pxxxx",
1394219584,
160,
1394219584,
1,
210090000,
471087779
),
1411634680,
15161125480764745506, 2592000);
bool isValid = result.success;
AssertThrow(isValid, "CheckStakeKernelHash failed");
var tpl0Hash = new List <byte> {
0x00, 0x00, 0x00, 0xdb, 0x33, 0x30, 0x88, 0x15,
0x19, 0xa4, 0xf3, 0x2b, 0x90, 0x91, 0xb0, 0x93,
0x0f, 0x24, 0xec, 0x6f, 0xb0, 0x90, 0x0a, 0xcf,
0xbf, 0xb0, 0xc2, 0x26, 0xc7, 0xbc, 0x31, 0x92,
};
//little endian
tpl0Hash.Reverse();
for (int i = 0; i < result.hash.Length; i++)
{
isValid = result.hash[i] == tpl0Hash[i];
AssertThrow(isValid, "CheckStakeKernelHash part 2 failed");
}
// check if template satisfies min target
var minbits = Mint.IncCompact(Mint.BigToCompact(result.minTarget));
var minresult = Mint.CheckStakeKernelHash(new MintTemplate(
"totest",
"Pxxx",
1394219584,
160,
1394219584,
1,
210090000,
minbits
),
1411634680,
15161125480764745506, 2592000);
isValid = minresult.success;
AssertThrow(isValid, "CheckStakeKernelHash part 3 failed");
}
public void ShouldCovertToCompact()
{
var dataset = new[] {
new long[] { 7, 16842752 },
new long[] { 734, 16842754 },
new long[] { 42, 16842752 },
new long[] { 1984, 16842759 }
};
foreach (var i in dataset)
{
var data = (uint)i[0];
var expected = i[1];
var bn = Mint.IncCompact(data);
bool isValid = bn == expected;
AssertThrow(isValid, "ShouldCovertToCompact failed");
}
}
public static CheckStakeResult CheckStakeKernelHash(MintTemplate template, uint txTime,
ulong stakeModifier, uint stakeMinAge)
{
var retobj = new CheckStakeResult
{
Id = template.Id,
OfAddress = template.OfAddress,
StakeModifier = stakeModifier,
BlockFromTime = template.BlockFromTime,
PrevTxOffset = template.PrevTxOffset,
PrevTxTime = template.PrevTxTime,
PrevTxOutIndex = template.PrevTxOutIndex,
FutureTimestamp = txTime,
};
if (txTime < template.PrevTxTime)
{
// Transaction timestamp violation
return(retobj);
}
if (template.BlockFromTime + stakeMinAge > txTime)
{
// Min age requirement
return(retobj);
}
var bnTargetPerCoinDay = Mint.CompactToBig(template.Bits !.Value);
long nTimeWeight = txTime - template.PrevTxTime;
if (nTimeWeight > PeercoinConstants.StakeMaxAge)
{
nTimeWeight = PeercoinConstants.StakeMaxAge;
}
long timeReduction = stakeMinAge;
nTimeWeight -= timeReduction;
var t1 = new BigInteger(24 * 60 * 60);
var t2 = new BigInteger(PeercoinConstants.Coin);
var t3 = new BigInteger(template.PrevTxOutValue);
var t4 = new BigInteger(nTimeWeight);
BigInteger bnCoinDayWeight = (((t3 * t4) / t2)) / t1;
BigInteger targetInt = bnCoinDayWeight * (bnTargetPerCoinDay);
//byte[] array = new byte[28];
var buffer = new byte[28];
var bufferindex = 0;
byte[] arrStakemodifier = BitConverter.GetBytes(stakeModifier);
//put stakemodifier in buffer
for (var i = 0; i < 8; i++)
{
buffer[bufferindex] = arrStakemodifier[i];
bufferindex++;
}
new List <uint>
{
(uint)template.BlockFromTime, (uint)template.PrevTxOffset, (uint)template.PrevTxTime,
(uint)template.PrevTxOutIndex, (uint)txTime
}
.ForEach(num =>
{
var dn = num;
for (var i = 0; i < 4; i++)
{
buffer[bufferindex] = (byte)(dn & 0xff);
dn >>= 8;
bufferindex++;
}
});
//no reverse so keep it in little endian
var hashProofOfStake = Mint.DoubleSha256(buffer.ToList()).ToArray(); //keep it in little-endian .Reverse().ToArray();
//add zero to last in array to make it unsigned:
// https://docs.microsoft.com/en-us/dotnet/api/system.numerics.biginteger.-ctor?view=netframework-4.5.2#System_Numerics_BigInteger__ctor_System_Byte___
var lastindex = hashProofOfStake.Length - 1;
if ((hashProofOfStake[lastindex] & 0x80) > 0)
{
byte[] temp = new byte[hashProofOfStake.Length];
Array.Copy(hashProofOfStake, temp, hashProofOfStake.Length);
hashProofOfStake = new byte[temp.Length + 1];
Array.Copy(temp, hashProofOfStake, temp.Length);
}
var hashProofOfStakeInt = new BigInteger(hashProofOfStake);
if (hashProofOfStakeInt > targetInt)
{
return(retobj);
}
//yeah, below target!
retobj.minTarget = (hashProofOfStakeInt / bnCoinDayWeight) - new BigInteger(1);
retobj.success = true;
retobj.hash = hashProofOfStake;
retobj.Id = template.Id;
var comp = Mint.IncCompact(
Mint.BigToCompact(retobj.minTarget)
);
retobj.minimumDifficulty = Mint.CompactToDiff(comp);
return(retobj);
}