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Added: Change Other Key

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This commit is contained in:
TheJoKlLa
2020-10-09 10:48:07 +02:00
parent 307bd60925
commit b52a976098
4 changed files with 134 additions and 44 deletions
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73
NFC/NXP MIFARE DESFire/MIFARE_DESFire_V2.cs
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@ -70,7 +70,7 @@ namespace NFC.Mifare_DESFire
/// <param name="data">Data</param>
public string ConvertToHexString(byte[] data)
{
return BitConverter.ToString(data).Replace("-", " ");
return BitConverter.ToString(data).Replace("-", "").ToLower();
}
/// <summary>
@ -679,6 +679,12 @@ namespace NFC.Mifare_DESFire
_Log.Debug("End AuthenticateISO_DES");
}
/// <summary>
/// Change Same AES key as Authenticated
/// </summary>
/// <param name="key_id"></param>
/// <param name="new_key"></param>
/// <param name="key_version"></param>
public void ChangeKey_AES(byte key_id, byte[] new_key, byte key_version)
{
_Log.Debug("Start ChangeKey_AES");
@ -708,6 +714,9 @@ namespace NFC.Mifare_DESFire
byte[] cryptogram_enc = aes.Encrypt(cryptogram_block, _SessionKey, _IV);
_Log.DebugFormat("cryptogram_enc: {0}", ConvertToHexString(cryptogram_enc));
_IV = ExtractLastBlock(cryptogram_enc, 16);
_Log.DebugFormat("_IV: {0}", ConvertToHexString(_IV));
byte[] data = Concatenate(new byte[] { key_id }, cryptogram_enc);
_Log.DebugFormat("data: {0}", ConvertToHexString(data));
@ -726,6 +735,68 @@ namespace NFC.Mifare_DESFire
_Log.Debug("End ChangeKey_AES");
}
/// <summary>
/// Change other AES key as Authenticated
/// </summary>
/// <param name="key_id"></param>
/// <param name="new_key"></param>
/// <param name="key_version"></param>
public void ChangeOtherKey_AES(byte key_id, byte[] new_key, byte[] old_key, byte key_version)
{
_Log.Debug("Start ChangeOtherKey_AES");
byte[] header = new byte[]
{
0xC4, key_id
};
_Log.DebugFormat("header: {0}", ConvertToHexString(header));
byte[] key_xor = XOR(new_key, old_key);
// AES Key Version is Append to Key
byte[] key_and_version = Concatenate(key_xor, new byte[] { key_version });
byte[] command = Concatenate(header, key_and_version);
_Log.DebugFormat("command: {0}", ConvertToHexString(command));
CRC32 crc32 = new CRC32();
byte[] crc_cmd = crc32.Calculate(command);
_Log.DebugFormat("crc_cmd: {0}", ConvertToHexString(crc_cmd));
byte[] crc_key = crc32.Calculate(new_key);
_Log.DebugFormat("crc_key: {0}", ConvertToHexString(crc_key));
byte[] cryptogram = Concatenate(key_and_version, crc_cmd);
cryptogram = Concatenate(cryptogram, crc_key);
_Log.DebugFormat("cryptogram: {0}", ConvertToHexString(cryptogram));
byte[] cryptogram_block = ExpandToBlockSize(cryptogram, 16);
_Log.DebugFormat("cryptogram_block: {0}", ConvertToHexString(cryptogram_block));
AES aes = new AES();
byte[] cryptogram_enc = aes.Encrypt(cryptogram_block, _SessionKey, _IV);
_Log.DebugFormat("cryptogram_enc: {0}", ConvertToHexString(cryptogram_enc));
_IV = ExtractLastBlock(cryptogram_enc, 16);
_Log.DebugFormat("_IV: {0}", ConvertToHexString(_IV));
byte[] data = Concatenate(new byte[] { key_id }, cryptogram_enc);
_Log.DebugFormat("data: {0}", ConvertToHexString(data));
APDUCommand cmd_ChangeKey = new APDUCommand(IsoCase.Case4Short)
{
CLA = 0x90,
INS = 0xC4,
Data = data
};
_Log.DebugFormat("APDU_CMD(cmd_ChangeKey): {0}", ConvertToHexString(cmd_ChangeKey.ToArray()));
APDUResponse response = _Card.Transmit(cmd_ChangeKey);
_Log.DebugFormat("APDU_RES(cmd_ChangeKey): {0}", ConvertToHexString(response.ToArray()));
CheckAPDUResponse(response);
_Log.Debug("End ChangeOtherKey_AES");
}
#endregion
#region Configuration Generator