private static async Task <bool> ValidateChecksumAsync(string address)
{
address = address.Remove(0, 2);
var addressBytes = Encoding.UTF8.GetBytes(address.ToLowerInvariant());
var caseMapBytes = (await Multihash.SumAsync <KECCAK_256>(addressBytes)).Digest;
for (var i = 0; i < 40; i++)
{
var addressChar = address[i];
if (!char.IsLetter(addressChar))
{
continue;
}
var leftShift = i % 2 == 0 ? 7 : 3;
var shouldBeUpper = (caseMapBytes[i / 2] & (1 << leftShift)) != 0;
var shouldBeLower = !shouldBeUpper;
if (shouldBeUpper && char.IsLower(addressChar) ||
shouldBeLower && char.IsUpper(addressChar))
{
return(false);
}
}
return(true);
}
public static async Task <byte[]> SumAsync(params byte[][] data)
{
var multihash = await Multihash.SumAsync <KECCAK_256>
(
data : ConcatMany(data)
);
return(multihash.Digest);
}
public async Task <byte[]> SumAsync(
params byte[][] data)
{
var multihash = await Multihash.SumAsync
(
type : _hashType,
data : data.Concat()
);
return(multihash.Digest);
}
public async Task VerifyRoundTripAsync(HashType type)
{
var rand = new Random(Environment.TickCount);
var bytes = new byte[rand.Next(1024, 4096)];
rand.NextBytes(bytes);
var mh = await Multihash.SumAsync(type, bytes, type == HashType.ID?bytes.Length : -1);
var str = mh.ToString();
var mh2 = Multihash.Parse(str);
Assert.True(await mh2.VerifyAsync(bytes));
}