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Added: Authenticate

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This commit is contained in:
TheJoKlLa 2020-10-01 23:47:47 +02:00
parent c943a51d9c
commit 6a5f521800
1 changed files with 52 additions and 24 deletions
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74
NFC/Mifare DESFire/MifareDESFire.cs
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@ -4,6 +4,7 @@ using PCSC.Iso7816;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
@ -81,7 +82,7 @@ namespace NFC.Mifare_DESFire
/// <param name="key"></param>
public void Authenticate(byte key_id, byte[] key)
{
APDUCommand cmd_getchallange = new APDUCommand(IsoCase.Case4Short)
APDUCommand cmd_challange_request = new APDUCommand(IsoCase.Case4Short)
{
CLA = 0x90,
INS = (byte)0x1A,
@ -90,55 +91,82 @@ namespace NFC.Mifare_DESFire
key_id
}
};
APDUResponse response = _Card.Transmit(cmd_getchallange);
APDUResponse response = _Card.Transmit(cmd_challange_request);
byte[] challenge = response.Body;
Console.WriteLine("Challange: {0}", toHexString(challenge));
byte[] rndB_enc = response.Body;
Console.WriteLine("rndB_enc: {0}", toHexString(rndB_enc));
DES des = new DES();
byte[] rndB = des.Decrypt(rndB_enc, key, GenerateDefaultKey(8));
Console.WriteLine("rndB: {0}", toHexString(rndB));
byte[] iv = new byte[8];
rndB.CopyTo(iv, 0);
byte[] rndB_rl = rotateLeft(rndB);
Console.WriteLine("rndB_enc: {0}", toHexString(rndB_rl));
byte[] rndA = new byte[]
{
0x92, 0x31, 0x34, 0x8B, 0x66, 0x35, 0xA8, 0xAF
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08
};
Console.WriteLine("rndA: {0}", toHexString(rndA));
TripleDES des = new TripleDES();
byte[] rndB = des.Decrypt(challenge, key, GenerateDefaultKey(8));
Console.WriteLine("rndB: {0}", toHexString(rndB));
byte[] rndAB = concatenate(rndA, rndB_rl);
Console.WriteLine("rndAB: {0}", toHexString(rndAB));
byte[] leftRotatedRndB = rotateLeft(rndB);
Console.WriteLine("leftRotatedRndB: {0}", toHexString(leftRotatedRndB));
byte[] rndAB_enc = des.Encrypt(rndAB, key, rndB_enc);
Console.WriteLine("rndA_rndB_enc: {0}", toHexString(rndAB_enc));
iv = lastBlock(rndAB_enc);
byte[] rndA_rndB = concatenate(rndA, leftRotatedRndB);
Console.WriteLine("rndA_rndB: {0}", toHexString(rndA_rndB));
byte[] challengeAnswer = des.Encrypt(rndA_rndB, key, GenerateDefaultKey(8));
Console.WriteLine("challengeAnswer: {0}", toHexString(challengeAnswer));
APDUCommand cmd_answerchallange = new APDUCommand(IsoCase.Case4Short)
APDUCommand cmd_challange_response = new APDUCommand(IsoCase.Case4Short)
{
CLA = 0x90,
INS = (byte)0xAF,
Data = challengeAnswer
Data = rndAB_enc
};
Console.WriteLine("cmd_answerchallange: {0}", toHexString(cmd_answerchallange.ToArray()));
Console.WriteLine("cmd_challange_response: {0}", toHexString(cmd_challange_response.ToArray()));
response = _Card.Transmit(cmd_answerchallange);
response = _Card.Transmit(cmd_challange_response);
byte[] encryptedRndAFromCard = response.Body;
Console.WriteLine("encryptedRndAFromCard: {0}", toHexString(encryptedRndAFromCard));
byte[] rotatedRndAFromCard = des.Decrypt(encryptedRndAFromCard, key, GenerateDefaultKey(8));
byte[] rotatedRndAFromCard = des.Decrypt(encryptedRndAFromCard, key, iv);
Console.WriteLine("rotatedRndAFromCard: {0}", toHexString(rotatedRndAFromCard));
byte[] rndAFromCard = rotateRight(rotatedRndAFromCard);
Console.WriteLine("rndAFromCard: {0}", toHexString(rndAFromCard));
if (!rndA.Equals(rndAFromCard))
if (!rndA.SequenceEqual(rndAFromCard))
{
throw new Exception("???");
}
}
public byte[] lastBlock(byte[] data)
{
byte[] block = new byte[8];
for(int i = 0; i < block.Length; i++)
{
block[i] = data[data.Length - block.Length + i];
}
return block;
}
public byte[] exclusiveOR(byte[] a, byte[] b)
{
byte[] c = new byte[a.Length];
for (int i = 0; i < a.Length; i++)
{
c[i] = (byte)(a[i] ^ b[i]);
}
return c;
}
private String toHexString(byte[] data)
{
return BitConverter.ToString(data).Replace("-", string.Empty);
@ -165,7 +193,7 @@ namespace NFC.Mifare_DESFire
data.CopyTo(rotate, 0);
byte temp = rotate[rotate.Length - 1];
for (var i = rotate.Length - 1; i > 1; i--)
for (var i = rotate.Length - 1; i > 0; i--)
{
rotate[i] = rotate[i - 1];
}