private async void startVerifyButton_Click(object sender, EventArgs e)
{
progressBar1.Value = 25;
List <FullStudent> students = await GetAllFullStudents();
progressBar1.Value = 50;
Console.WriteLine($"Total records: {students.Count}");
string student1 = "";
string student2 = "";
numOfRecords.Text = students.Count.ToString();
// now that we have the fullstudent records, we can start the verfication of them all
BasicStudent genesisStudent = StudentMapper.GenesisStudentNode();
// start at the end of the records and then recalculate the hash of the node and check if it matches with the one on record
// then recalculate the hash of the previous node and check to see if it matches with the currents previous on record
// if both are valid, then the record is considered to be valid
// otherwise, the record is invalid
// Print some debug info alongside
bool valid = true;
for (int i = students.Count - 1; i >= 0; i--)
{
bool currentHashMatch = true;
bool previousHashMatch = true;
bool previousFullHashMatch = true;
FullStudent currentFullStudent = students[i];
Console.WriteLine($"Current Student: {currentFullStudent.FirstName}");
string recalculatedCurrentNodeHash = CalculateCurrentFullStudentHash(currentFullStudent);
if (recalculatedCurrentNodeHash != currentFullStudent.CurrentNodeHash)
{
currentHashMatch = false;
}
if (i == 0)
{
Console.WriteLine($"Genesis Node Previous: Test");
string previousGenesisHash = Hash.GetHashString("Test");
if (currentFullStudent.PreviousRecordHash != previousGenesisHash)
{
previousHashMatch = false;
}
if (previousGenesisHash != currentFullStudent.PreviousFullRecordHash)
{
previousFullHashMatch = false;
}
}
else
{
FullStudent previousFullStudent = students[i - 1];
Console.WriteLine($"Previous Student: {previousFullStudent.FirstName}");
string recalculatedPreviousNodeHash = CalculateCurrentFullStudentHash(previousFullStudent);
if (currentFullStudent.PreviousRecordHash != recalculatedPreviousNodeHash)
{
previousHashMatch = false;
student2 = previousFullStudent.FirstName;
}
// new
string previousFullHashObject = JsonConvert.SerializeObject(previousFullStudent);
string previousFullHash = Hash.GetHashString(previousFullHashObject);
if (previousFullHash != currentFullStudent.PreviousFullRecordHash)
{
previousFullHashMatch = false;
}
}
if (!currentHashMatch || !previousHashMatch || !previousFullHashMatch) // also check the fullnodehashmatch
{
valid = false;
student1 = currentFullStudent.FirstName;
break;
}
}
progressBar1.Value = 100;
if (valid)
{
MessageBox.Show("Hash Verified and Unmodified", "Success");
}
else
{
if (student2.Length == 0)
{
MessageBox.Show($"Hash mismatch on {student1}", "Error");
}
else
{
MessageBox.Show($"Hash mismatch on {student1} and {student2}", "Error");
}
}
}