public static string AddChecksum(
string addressString)
{
ValidateFormatAndThrowIfInvalid(addressString);
addressString = addressString.Remove(0, 2).ToLowerInvariant();
var addressBytes = Encoding.UTF8.GetBytes(addressString);
var caseMapBytes = Keccak256.Sum(addressBytes);
var addressBuilder = new StringBuilder("0x");
for (var i = 0; i < 40; i++)
{
var addressChar = addressString[i];
if (char.IsLetter(addressChar))
{
var leftShift = i % 2 == 0 ? 7 : 3;
var shouldBeUpper = (caseMapBytes[i / 2] & (1 << leftShift)) != 0;
if (shouldBeUpper)
{
addressChar = char.ToUpper(addressChar);
}
}
addressBuilder.Append(addressChar);
}
return(addressBuilder.ToString());
}
private static bool ValidateChecksum(
string addressString)
{
addressString = addressString.Remove(0, 2);
var addressBytes = Encoding.UTF8.GetBytes(addressString.ToLowerInvariant());
var caseMapBytes = Keccak256.Sum(addressBytes);
for (var i = 0; i < 40; i++)
{
var addressChar = addressString[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);
}
private static string GetTransactionHash(
string signedTxData)
{
var txDataBytes = signedTxData.HexToByteArray();
return(Keccak256
.Sum(txDataBytes)
.ToHex(true));
}