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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;
using System.Collections.Generic; using System.Collections.Generic;
using System.IO; using System.IO;
using System.Linq;
using System.Net.Http; using System.Net.Http;
using System.Text; using System.Text;
@ -81,7 +82,7 @@ namespace NFC.Mifare_DESFire
/// <param name="key"></param> /// <param name="key"></param>
public void Authenticate(byte key_id, byte[] key) 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, CLA = 0x90,
INS = (byte)0x1A, INS = (byte)0x1A,
@ -90,55 +91,82 @@ namespace NFC.Mifare_DESFire
key_id key_id
} }
}; };
APDUResponse response = _Card.Transmit(cmd_getchallange); APDUResponse response = _Card.Transmit(cmd_challange_request);
byte[] challenge = response.Body; byte[] rndB_enc = response.Body;
Console.WriteLine("Challange: {0}", toHexString(challenge)); 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[] 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)); Console.WriteLine("rndA: {0}", toHexString(rndA));
TripleDES des = new TripleDES(); byte[] rndAB = concatenate(rndA, rndB_rl);
byte[] rndB = des.Decrypt(challenge, key, GenerateDefaultKey(8)); Console.WriteLine("rndAB: {0}", toHexString(rndAB));
Console.WriteLine("rndB: {0}", toHexString(rndB));
byte[] leftRotatedRndB = rotateLeft(rndB); byte[] rndAB_enc = des.Encrypt(rndAB, key, rndB_enc);
Console.WriteLine("leftRotatedRndB: {0}", toHexString(leftRotatedRndB)); Console.WriteLine("rndA_rndB_enc: {0}", toHexString(rndAB_enc));
iv = lastBlock(rndAB_enc);
byte[] rndA_rndB = concatenate(rndA, leftRotatedRndB); APDUCommand cmd_challange_response = new APDUCommand(IsoCase.Case4Short)
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)
{ {
CLA = 0x90, CLA = 0x90,
INS = (byte)0xAF, 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; byte[] encryptedRndAFromCard = response.Body;
Console.WriteLine("encryptedRndAFromCard: {0}", toHexString(encryptedRndAFromCard)); 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)); Console.WriteLine("rotatedRndAFromCard: {0}", toHexString(rotatedRndAFromCard));
byte[] rndAFromCard = rotateRight(rotatedRndAFromCard); byte[] rndAFromCard = rotateRight(rotatedRndAFromCard);
Console.WriteLine("rndAFromCard: {0}", toHexString(rndAFromCard)); Console.WriteLine("rndAFromCard: {0}", toHexString(rndAFromCard));
if (!rndA.Equals(rndAFromCard)) if (!rndA.SequenceEqual(rndAFromCard))
{ {
throw new Exception("???"); 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) private String toHexString(byte[] data)
{ {
return BitConverter.ToString(data).Replace("-", string.Empty); return BitConverter.ToString(data).Replace("-", string.Empty);
@ -165,7 +193,7 @@ namespace NFC.Mifare_DESFire
data.CopyTo(rotate, 0); data.CopyTo(rotate, 0);
byte temp = rotate[rotate.Length - 1]; 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]; rotate[i] = rotate[i - 1];
} }