public void TestProtectVerifyIntegrity()
{
var key = "eda8506c1fb0bbcc3f62626fef074bbf2d09a8c7c608f3fa1482c9a625d00f75".ToByteArray();
var message = Encoding.ASCII.GetBytes("hoy, how are you?");
var plaintextAndTag = Symmetric.ProtectIntegrity(key, message);
var retrievedMessage = Symmetric.VerifyIntegrity(key, plaintextAndTag);
if (!message.SequenceEqual(retrievedMessage))
{
throw new Exception("Verify did not work");
}
// Tamper
plaintextAndTag[plaintextAndTag.Length - 1] ^= 1;
bool tamperDetected;
try
{
Symmetric.VerifyIntegrity(key, plaintextAndTag);
tamperDetected = false;
}
catch (Exception)
{
tamperDetected = true;
}
if (!tamperDetected)
{
throw new Exception("Verify did not work");
}
}