NFC写入工具，包括对NTAG213开启密码保护和关闭密码保护的功能
NTAG213密码保护开启(采用MifareUltralight配置)： 配合食用：https://www.cnblogs.com/yjpjy/p/12420006.html
/**
* 写入NFC设置密码
*/
private fun writePassword(mfc: MifareUltralight) {
val sp = getSharedPreferences("pwd", Context.MODE_PRIVATE)
val pwdstr = sp.getString("pwd", "");
//创建默认为0的4字节数组
val pwd = Array<Byte>(4) { ((0).toByte()) }
val temp = pwdstr?.toByteArray()
if (temp != null) {
for ((index, e) in temp.withIndex()) {
pwd[index] = temp[index]
}
}
//得出的PWD即用户设置的密码
mfc.connect()
val pwd_default = byteArrayOf(0xFF.toByte(), 0xFF.toByte(), 0xFF.toByte(), 0xFF.toByte())
val pack = byteArrayOf(0.toByte(), 0.toByte())
try {
//先用默认密码进行询问
val response = mfc.transceive(
byteArrayOf(
0x1B //PWD_AUTH
, pwd_default[0], pwd_default[1], pwd_default[2], pwd_default[3]
)
)
// Check if PACK is matching expected PACK
// This is a (not that) secure method to check if tag is genuine
if ((response != null) && (response.size >= 2)) {
val packResponse = Arrays.copyOf(response, 2);
if (!(pack[0] == packResponse[0] && pack[1] == packResponse[1])) {
Toast.makeText(
this@MainActivity,
"Tag could not be authenticated:\n$packResponse≠$pack",
Toast.LENGTH_LONG
).show();
}
}
// set PACK:
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
0x2C, /*PAGE 44*/
pack[0], pack[1], 0, 0 // Write PACK into first 2 Bytes and 0 in RFUI bytes
)
)
// set PWD: 设置密码为用户设置的密码
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
0x2B, /*PAGE 43*/
pwd[0],
pwd[1],
pwd[2],
pwd[3] // Write PACK into first 2 Bytes and 0 in RFUI bytes
)
)
// set AUTHLIM: 设置错误次数限制
val responseAuthLim = mfc.readPages(42)
if (responseAuthLim != null && responseAuthLim.size >= 16) {
val prot =
false // false = PWD_AUTH for write only, true = PWD_AUTH for read and write
val authLim = 0; //0-7
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
42,
(responseAuthLim[0] and 0x078 or (if (prot) 0x080.toByte() else 0x000) or ((authLim and 0x007).toByte())).toByte()
,
responseAuthLim[1],
responseAuthLim[2],
responseAuthLim[3]
//将1-3位按原数据写会
)
)
}
//设置Auth0 auth0实际控制是否启用密码保护
val responseAuth0 = mfc.readPages(41)
if (responseAuth0 != null && responseAuth0.size >= 16) {
val prot =
false; // false = PWD_AUTH for write only, true = PWD_AUTH for read and write
val auth0 = 0;
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
41,
responseAuthLim[0],
responseAuthLim[1],
responseAuthLim[2],
//将0-2位按原数据写会
(auth0 and 0x0ff).toByte()
)
)
}
Log.e("写密码完成", "写密码完成")
} catch (e: IOException) {
e.printStackTrace()
} catch (e: FormatException) {
e.printStackTrace()
} finally {
mfc.close()
}
}
NTAG213密码保护关闭(采用MifareUltralight配置)：
/**
* 删除NFC设置的密码保护
*/
private fun deletePassword(mfc: MifareUltralight) {
val sp = getSharedPreferences("pwd", Context.MODE_PRIVATE)
val pwdstr = sp.getString("pwd", "");
//创建默认为0的4字节数组
val pwd = Array<Byte>(4) { ((0).toByte()) }
val temp = pwdstr?.toByteArray()
if (temp != null) {
for ((index, e) in temp.withIndex()) {
pwd[index] = temp[index]
}
}
//得出的PWD即用户设置的密码
mfc.connect()
val pwd_default = byteArrayOf(0xFF.toByte(), 0xFF.toByte(), 0xFF.toByte(), 0xFF.toByte())
val pack = byteArrayOf(0.toByte(), 0.toByte())
try {
//用用户设置的密码询问登录
val response = mfc.transceive(
byteArrayOf(
0x1B, pwd[0], pwd[1], pwd[2], pwd[3]
)
)
// Check if PACK is matching expected PACK
// This is a (not that) secure method to check if tag is genuine
if ((response != null) && (response.size >= 2)) {
val packResponse = Arrays.copyOf(response, 2);
if (!(pack[0] == packResponse[0] && pack[1] == packResponse[1])) {
Toast.makeText(
this@MainActivity,
"Tag could not be authenticated:\n$packResponse≠$pack",
Toast.LENGTH_LONG
).show();
} else {
Toast.makeText(this@MainActivity, "密码校验正确", Toast.LENGTH_LONG).show()
}
} else {
}
//pack置为默认
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
0x2C, /*PAGE 44*/
pack[0], pack[1], 0, 0 // Write PACK into first 2 Bytes and 0 in RFUI bytes
)
)
//pwd置为默认
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
0x2B, /*PAGE 43*/
pwd_default[0],
pwd_default[1],
pwd_default[2],
pwd_default[3] // Write PACK into first 2 Bytes and 0 in RFUI bytes
)
)
// set AUTHLIM:
//将AUTHLIM（第42页，字节0，位2-0）设置为失败的最大密码验证尝试次数
val responseAuthLim = mfc.readPages(42)
if (responseAuthLim != null && responseAuthLim.size >= 16) {
val prot =
false // false = PWD_AUTH for write only, true = PWD_AUTH for read and write
val authLim = 0; //0-7
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
42,
(responseAuthLim[0] and 0x078 or (if (prot) 0x080.toByte() else 0x000) or ((authLim and 0x007).toByte())).toByte(),
responseAuthLim[1],
responseAuthLim[2],
responseAuthLim[3]
//将1-3位按原数据写会
)
)
}
//设置Auth0 如果auth0设置为FF则为禁用密码保护
val responseAuth0 = mfc.readPages(41)
if (responseAuth0 != null && responseAuth0.size >= 16) {
mfc.transceive(
byteArrayOf(
0xA2.toByte(),
41,
responseAuthLim[0],
responseAuthLim[1],
responseAuthLim[2],
//将0-2位按原数据写会
0x0ff.toByte()
)
)
}
if (dialog != null && dialog!!.isShowing) {
dialog!!.dismiss()
}
Toast.makeText(this, "清除密码成功", Toast.LENGTH_LONG).show()
} catch (e: IOException) {
e.printStackTrace()
if (dialog != null && dialog!!.isShowing) {
dialog!!.dismiss()
}
} catch (e: FormatException) {
e.printStackTrace()
if (dialog != null && dialog!!.isShowing) {
dialog!!.dismiss()
}
} finally {
mfc.close()
}
}