patterns: Added NTAG pattern

2026-03-27 23:37:04 -05:00 · 2022-09-02 17:14:23 +02:00
parent f32b162647
commit 1e45938887
3 changed files with 162 additions and 0 deletions
--- a/patterns/ntag.hexpat
+++ b/patterns/ntag.hexpat
@@ -0,0 +1,161 @@
+bitfield AccessCapability {
+	Read : 4;
+	Write : 4;
+} [[left_to_right]];
+
+struct CapabilityContainer {
+	u8 magic;
+	u8 version;
+	u8 memorySize;
+	AccessCapability accessCapability;
+};
+
+bitfield NDEFFlags {
+	MB	: 1;
+	ME	: 1;
+	CF	: 1;
+	SR	: 1;
+	IL	: 1;
+	TNF	: 3;
+} [[left_to_right]];
+
+enum TNFType : u8 {
+	Empty 					= 0x00,
+	NFCForumWellKnownType 	= 0x01,
+	MediaType				= 0x02,
+	AbsoluteURI				= 0x03,
+	NFCForumExternalType 	= 0x04,
+	Unknown 				= 0x05,
+	Unchanged 				= 0x06,
+	Reserved 				= 0x07
+};
+
+struct NDEF {
+	NDEFFlags flags;
+	u8 typeLength;
+	
+	if (flags.SR)
+		u8 payloadLength;
+	else
+		u32 payloadLength;
+		
+	if (flags.IL)
+		u8 idLength;
+		
+	char type[typeLength];
+	
+	if (flags.IL)
+		u8 id[idLength];
+	
+	u8 payload[payloadLength];
+		
+	if (flags.ME)
+		break;
+};
+
+struct LockControl {
+	u8 dynamicLockByteOffset;
+	u8 numBits;
+	u8 pageControlInfo;
+};
+
+struct MemoryControl {
+	u8 reservedBytesOffset;
+	u8 numBytes;
+	u8 pageSize;
+};
+
+struct Length {
+	u8 byte [[hidden, no_unique_address]];
+	if (byte == 0xFF)
+		u24 length;
+	else
+		u8 length;
+} [[sealed, transform("transform_length"), format("transform_length")]];
+
+fn transform_length(Length length) {
+	return length.length;
+};
+
+enum Tag : u8 {
+	NULL 			= 0x00,
+	LockControl 	= 0x01,
+	MemoryControl 	= 0x02,
+	NDEFMessage 	= 0x03,
+	Proprietary 	= 0xFD,
+	TerminatorTLV 	= 0xFE
+};
+
+struct TLV {
+	Tag tag;
+	if (tag == Tag::TerminatorTLV) {
+		break;
+	} else if (tag == Tag::NULL) {
+		// Empty
+	} else {
+		Length length;
+		
+		if (length > 0) {
+			if (tag == Tag::LockControl) {
+				LockControl lockControl;
+			} else if (tag == Tag::MemoryControl) {
+				LockControl lockControl;
+			} else if (tag == Tag::NDEFMessage) {
+				NDEF ndef[while(true)];
+			} else {
+				u8 value[length];
+			}
+		}
+	}
+};
+
+struct ManufacturerData {
+	u8 serial1[3];
+	u8 checkByte0;
+	u8 serial2[4];
+	u8 checkByte1;
+	u8 internal;
+	u16 lockBytes;
+};
+
+struct DynamicLockBytes {
+	u8 bytes[3];
+	u8 RFUI;
+};
+
+bitfield MIRROR {
+	MIRROR_CONF	: 2;
+	MIRROR_BYTE	: 2;
+	RFUI		: 1;
+	STRG_MOD_EN	: 1;
+	RFUI		: 2;
+} [[left_to_right]];
+
+bitfield ACCESS {
+	PROT				: 1;
+	CFGLCK				: 1;
+	RFUI				: 1;
+	NFC_CNT_EN			: 1;
+	NFC_CNT_PWD_PROT	: 1;
+	AUTHLIM				: 3;
+};
+
+struct Config {
+	MIRROR MIRROR;
+	u8 MIRROR_PAGE;
+	u8 AUTH0;
+	ACCESS ACCESS;
+	u32 PWD;
+	u16 PACK;
+};
+
+struct NTAG {
+	ManufacturerData manufacturerData;
+	CapabilityContainer cc;
+	TLV tlv[while(true)];
+	padding[addressof(tlv) + cc.memorySize * 8 - sizeof(tlv)];
+	DynamicLockBytes dynamicLockBytes;
+	Config config;
+};
+
+NTAG ntag @ 0x00;