private static async Task TestSecureChannel(DaplugAPI api, DaplugKeySet keyset, DaplugSecurityLevel secLevel)
{
WriteTitle();
await api.OpenSecureChannelAsync(keyset, secLevel);
WriteSuccess("Success!");
api.CloseSecureChannel();
}
public async Task OpenSecureChannelAsync(DaplugKeySet keyset, DaplugSecurityLevel securityLevel, byte[] diversifier = null, byte[] hostChallenge = null)
{
if (keyset.EncKey == null || keyset.MacKey == null || keyset.DeKey == null)
{
throw new DaplugAPIException("Invalid keyset.");
}
if (hostChallenge == null)
{
Random rnd = new Random();
hostChallenge = new byte[8];
rnd.NextBytes(hostChallenge);
}
var authCommandHeader = new byte[] { 0x80, 0x50, keyset.Version, 0x00, 0x00 };
var authCommand = new APDUCommand(authCommandHeader, hostChallenge);
var response = await ExchangeAPDUAsync(authCommand);
if (response.IsSuccessfulResponse == false)
{
throw new DaplugAPIException("INITIALIZE UPDATE failed.", response.SW1, response.SW2);
}
byte[] counter = new byte[2];
byte[] cardChallenge = new byte[8];
byte[] cardCryptogram = new byte[8];
Array.Copy(response.ResponseData, 12, counter, 0, 2);
Array.Copy(response.ResponseData, 12, cardChallenge, 0, 8);
Array.Copy(response.ResponseData, 20, cardCryptogram, 0, 8);
var tempSessionKeys = DaplugCrypto.ComputeSessionKeys(keyset, counter);
var computedCardCryptogram = DaplugCrypto.CalculateCryptogram(tempSessionKeys, hostChallenge, cardChallenge);
if (computedCardCryptogram.SequenceEqual(cardCryptogram) == false)
{
throw new DaplugAPIException("Invalid card cryptogram.");
}
var hostCryptogram = DaplugCrypto.CalculateCryptogram(tempSessionKeys, cardChallenge, hostChallenge);
if (securityLevel.HasFlag(DaplugSecurityLevel.COMMAND_MAC) == false)
{
securityLevel |= DaplugSecurityLevel.COMMAND_MAC;
}
tempSessionKeys.SecurityLevel = securityLevel;
SessionKeys = tempSessionKeys;
var extAuthCommandHeader = new byte[] { 0x80, 0x82, (byte)SessionKeys.SecurityLevel, 0x00, 0x00 };
var extAuthCommand = new APDUCommand(extAuthCommandHeader, hostCryptogram);
var extAuthResponse = await ExchangeAPDUAsync(extAuthCommand);
if (extAuthResponse.IsSuccessfulResponse == false)
{
SessionKeys = null;
throw new DaplugAPIException("EXTERNAL AUTHENTICATE failed.", response.SW1, response.SW2);
}
Array.Copy(SessionKeys.CMac, SessionKeys.RMac, 8);
}
