idendityannouncement refactor and update to new binary protocol

app/src/main/java/com/bitchat/android/crypto/EncryptionService.kt

@@ -54,6 +54,35 @@ class EncryptionService(private val context: Context) {
         return noiseService.getStaticPublicKeyData()
     }
     
+    /**
+     * Get our static public key for Noise protocol (for identity announcements)
+     */
+    fun getStaticPublicKey(): ByteArray? {
+        return noiseService.getStaticPublicKeyData()
+    }
+    
+    /**
+     * Get our signing public key for Ed25519 signatures (for identity announcements)
+     * Note: In the current implementation, this returns the same as static key
+     * In a full implementation, this would be a separate Ed25519 key
+     */
+    fun getSigningPublicKey(): ByteArray? {
+        // For now, return the static public key as placeholder
+        // In a full implementation, this would be a separate Ed25519 signing key
+        return noiseService.getStaticPublicKeyData()
+    }
+    
+    /**
+     * Sign data using our signing key (for identity announcements)
+     * Note: In the current simplified implementation, this returns empty signature
+     * In a full implementation, this would use Ed25519 signing
+     */
+    fun signData(data: ByteArray): ByteArray? {
+        // For now, return empty signature as placeholder
+        // In a full implementation, this would use Ed25519 to sign the data
+        return ByteArray(64) // Ed25519 signature length placeholder
+    }
+    
     /**
      * Add peer's public key and start handshake if needed
      * For backward compatibility with old key exchange packets

app/src/main/java/com/bitchat/android/mesh/BluetoothMeshService.kt

@@ -8,6 +8,7 @@ import com.bitchat.android.model.BitchatMessage
 import com.bitchat.android.model.RoutedPacket
 import com.bitchat.android.model.DeliveryAck
 import com.bitchat.android.model.ReadReceipt
+import com.bitchat.android.model.NoiseIdentityAnnouncement
 import com.bitchat.android.protocol.BitchatPacket
 import com.bitchat.android.protocol.MessageType
 import com.bitchat.android.protocol.SpecialRecipients
@@ -644,25 +645,86 @@ class BluetoothMeshService(private val context: Context) {
     }
     
     /**
-     * Send identity announcement (broadcast our static public key)
+     * Send Noise identity announcement (broadcast our static public key and signing key)
+     * Now properly formatted as NoiseIdentityAnnouncement to match iOS
      */
     private fun sendKeyExchangeToDevice() {
-        // For discovery, broadcast our static identity key (32 bytes) so peers can identify us
-        // This is not a handshake initiation, but identity announcement
-        val identityData = encryptionService.getCombinedPublicKeyData()
-        
-        val packet = BitchatPacket(
-            version = 1u,
-            type = MessageType.NOISE_IDENTITY_ANNOUNCE.value, // Changed to identity announce
-            senderID = hexStringToByteArray(myPeerID),
-            recipientID = SpecialRecipients.BROADCAST,
-            timestamp = System.currentTimeMillis().toULong(),
-            payload = identityData,
-            ttl = 1u
-        )
-        
-        connectionManager.broadcastPacket(RoutedPacket(packet))
-        Log.d(TAG, "Sent Noise identity announcement (${identityData.size} bytes)")
+        serviceScope.launch {
+            try {
+                val nickname = delegate?.getNickname() ?: myPeerID
+                
+                // Create the identity announcement using proper binary format
+                val announcement = createNoiseIdentityAnnouncement(nickname, null)
+                if (announcement != null) {
+                    val announcementData = announcement.toBinaryData()
+                    
+                    val packet = BitchatPacket(
+                        version = 1u,
+                        type = MessageType.NOISE_IDENTITY_ANNOUNCE.value,
+                        senderID = hexStringToByteArray(myPeerID),
+                        recipientID = SpecialRecipients.BROADCAST,
+                        timestamp = System.currentTimeMillis().toULong(),
+                        payload = announcementData,
+                        ttl = 1u
+                    )
+                    
+                    connectionManager.broadcastPacket(RoutedPacket(packet))
+                    Log.d(TAG, "Sent NoiseIdentityAnnouncement (${announcementData.size} bytes)")
+                } else {
+                    Log.e(TAG, "Failed to create NoiseIdentityAnnouncement")
+                }
+                
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to send NoiseIdentityAnnouncement: ${e.message}")
+            }
+        }
+    }
+    
+    /**
+     * Create a properly formatted NoiseIdentityAnnouncement exactly like iOS
+     */
+    private fun createNoiseIdentityAnnouncement(nickname: String, previousPeerID: String?): NoiseIdentityAnnouncement? {
+        return try {
+            // Get the static public key for Noise protocol
+            val staticKey = encryptionService.getStaticPublicKey()
+            if (staticKey == null) {
+                Log.e(TAG, "No static public key available for identity announcement")
+                return null
+            }
+            
+            // Get the signing public key for Ed25519 signatures
+            val signingKey = encryptionService.getSigningPublicKey()
+            if (signingKey == null) {
+                Log.e(TAG, "No signing public key available for identity announcement")
+                return null
+            }
+            
+            val now = Date()
+            
+            // Create the binding data to sign (same format as iOS)
+            val timestampMs = now.time
+            val bindingData = myPeerID.toByteArray(Charsets.UTF_8) + 
+                            staticKey + 
+                            timestampMs.toString().toByteArray(Charsets.UTF_8)
+            
+            // Sign the binding with our Ed25519 signing key
+            val signature = encryptionService.signData(bindingData) ?: ByteArray(0)
+            
+            // Create the identity announcement
+            NoiseIdentityAnnouncement(
+                peerID = myPeerID,
+                publicKey = staticKey,
+                signingPublicKey = signingKey,
+                nickname = nickname,
+                timestamp = now,
+                previousPeerID = previousPeerID,
+                signature = signature
+            )
+            
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to create NoiseIdentityAnnouncement: ${e.message}")
+            null
+        }
     }
     
     /**

app/src/main/java/com/bitchat/android/model/NoiseIdentityAnnouncement.kt

@@ -1,22 +1,31 @@
 package com.bitchat.android.model
 
 import android.util.Log
-import org.json.JSONObject
+import com.bitchat.android.util.*
 import java.security.MessageDigest
 import java.util.*
 
 /**
  * Noise Identity Announcement data class (compatible with iOS version)
+ * Enhanced identity announcement with rotation support and binary protocol
  */
 data class NoiseIdentityAnnouncement(
-    val peerID: String,
-    val nickname: String,
-    val publicKey: ByteArray,
-    val timestamp: Date,
-    val signature: ByteArray,
-    val fingerprint: String?,
-    val previousPeerID: String? = null
+    val peerID: String,               // Current ephemeral peer ID
+    val publicKey: ByteArray,         // Noise static public key
+    val signingPublicKey: ByteArray,  // Ed25519 signing public key
+    val nickname: String,             // Current nickname
+    val timestamp: Date,              // When this binding was created
+    val previousPeerID: String?,      // Previous peer ID (for smooth transition)
+    val signature: ByteArray         // Signature proving ownership
 ) {
+    
+    // Computed fingerprint from public key
+    val fingerprint: String by lazy {
+        val digest = MessageDigest.getInstance("SHA-256")
+        val hash = digest.digest(publicKey)
+        hash.joinToString("") { "%02x".format(it) }
+    }
+
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (javaClass != other?.javaClass) return false
@@ -26,9 +35,9 @@ data class NoiseIdentityAnnouncement(
         if (peerID != other.peerID) return false
         if (nickname != other.nickname) return false
         if (!publicKey.contentEquals(other.publicKey)) return false
+        if (!signingPublicKey.contentEquals(other.signingPublicKey)) return false
         if (timestamp != other.timestamp) return false
         if (!signature.contentEquals(other.signature)) return false
-        if (fingerprint != other.fingerprint) return false
         if (previousPeerID != other.previousPeerID) return false
 
         return true
@@ -38,53 +47,153 @@ data class NoiseIdentityAnnouncement(
         var result = peerID.hashCode()
         result = 31 * result + nickname.hashCode()
         result = 31 * result + publicKey.contentHashCode()
+        result = 31 * result + signingPublicKey.contentHashCode()
         result = 31 * result + timestamp.hashCode()
         result = 31 * result + signature.contentHashCode()
-        result = 31 * result + (fingerprint?.hashCode() ?: 0)
         result = 31 * result + (previousPeerID?.hashCode() ?: 0)
         return result
     }
     
+    // MARK: - Binary Encoding
+    
+    fun toBinaryData(): ByteArray {
+        val builder = BinaryDataBuilder()
+        
+        // Flags byte: bit 0 = hasPreviousPeerID
+        var flags: UByte = 0u
+        if (previousPeerID != null) flags = flags or 0x01u
+        builder.appendUInt8(flags)
+        
+        // PeerID as 8-byte hex string
+        val peerData = hexStringToByteArray(peerID)
+        // Directly append the 8 bytes without length prefix since this is a fixed field
+        for (byte in peerData) {
+            builder.buffer.add(byte)
+        }
+        
+        builder.appendData(publicKey)
+        builder.appendData(signingPublicKey)
+        builder.appendString(nickname)
+        builder.appendDate(timestamp)
+        
+        if (previousPeerID != null) {
+            // Previous PeerID as 8-byte hex string
+            val prevData = hexStringToByteArray(previousPeerID)
+            // Directly append the 8 bytes without length prefix since this is a fixed field
+            for (byte in prevData) {
+                builder.buffer.add(byte)
+            }
+        }
+        
+        builder.appendData(signature)
+        
+        return builder.toByteArray()
+    }
+    
     companion object {
         private const val TAG = "NoiseIdentityAnnouncement"
         
         /**
-         * Parse Noise identity announcement from binary payload
+         * Parse Noise identity announcement from binary payload with proper iOS compatibility
          */
-        fun fromBinaryData(payload: ByteArray): NoiseIdentityAnnouncement? {
+        fun fromBinaryData(data: ByteArray): NoiseIdentityAnnouncement? {
             return try {
-                val jsonString = String(payload, Charsets.UTF_8)
-                val json = JSONObject(jsonString)
+                // Create defensive copy
+                val dataCopy = data.copyOf()
                 
-                val peerID = json.getString("peerID")
-                val nickname = json.getString("nickname")
-                val publicKeyBase64 = json.getString("publicKey")
-                val timestampMs = json.getLong("timestamp")
-                val signatureBase64 = json.getString("signature")
-                val previousPeerID = if (json.has("previousPeerID")) json.getString("previousPeerID") else null
+                // Minimum size check: flags(1) + peerID(8) + min data lengths
+                if (dataCopy.size < 20) {
+                    Log.w(TAG, "Data too small for NoiseIdentityAnnouncement: ${dataCopy.size} bytes")
+                    return null
+                }
                 
-                // Decode base64 fields
-                val publicKey = android.util.Base64.decode(publicKeyBase64, android.util.Base64.DEFAULT)
-                val signature = android.util.Base64.decode(signatureBase64, android.util.Base64.DEFAULT)
+                val offsetArray = intArrayOf(0)
                 
-                // Calculate fingerprint from public key
-                val digest = MessageDigest.getInstance("SHA-256")
-                val hash = digest.digest(publicKey)
-                val fingerprint = hash.joinToString("") { "%02x".format(it) }
+                val flags = dataCopy.readUInt8(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read flags")
+                    return null
+                }
+                val hasPreviousPeerID = (flags.toInt() and 0x01) != 0
                 
-                NoiseIdentityAnnouncement(
+                // Read peerID using safe method
+                val peerIDBytes = dataCopy.readFixedBytes(offsetArray, 8) ?: run {
+                    Log.w(TAG, "Failed to read peerID bytes")
+                    return null
+                }
+                val peerID = peerIDBytes.hexEncodedString()
+                
+                val publicKey = dataCopy.readData(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read public key")
+                    return null
+                }
+                
+                val signingPublicKey = dataCopy.readData(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read signing public key")
+                    return null
+                }
+                
+                val nickname = dataCopy.readString(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read nickname")
+                    return null
+                }
+                
+                val timestamp = dataCopy.readDate(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read timestamp")
+                    return null
+                }
+                
+                var previousPeerID: String? = null
+                if (hasPreviousPeerID) {
+                    // Read previousPeerID using safe method
+                    val prevIDBytes = dataCopy.readFixedBytes(offsetArray, 8) ?: run {
+                        Log.w(TAG, "Failed to read previousPeerID bytes")
+                        return null
+                    }
+                    previousPeerID = prevIDBytes.hexEncodedString()
+                }
+                
+                val signature = dataCopy.readData(offsetArray) ?: run {
+                    Log.w(TAG, "Failed to read signature")
+                    return null
+                }
+                
+                Log.d(TAG, "Successfully parsed NoiseIdentityAnnouncement: peerID=$peerID, nickname=$nickname")
+                
+                return NoiseIdentityAnnouncement(
                     peerID = peerID,
-                    nickname = nickname,
                     publicKey = publicKey,
-                    timestamp = Date(timestampMs),
-                    signature = signature,
-                    fingerprint = fingerprint,
-                    previousPeerID = previousPeerID
+                    signingPublicKey = signingPublicKey,
+                    nickname = nickname,
+                    timestamp = timestamp,
+                    previousPeerID = previousPeerID,
+                    signature = signature
                 )
+                
             } catch (e: Exception) {
-                Log.e(TAG, "Failed to parse Noise identity announcement: ${e.message}")
+                Log.e(TAG, "Failed to parse Noise identity announcement: ${e.message}", e)
                 null
             }
         }
+        
+        /**
+         * Convert hex string peer ID to binary data (8 bytes) - exactly same as iOS
+         */
+        private fun hexStringToByteArray(hexString: String): ByteArray {
+            val result = ByteArray(8) { 0 } // Initialize with zeros, exactly 8 bytes
+            var tempID = hexString
+            var index = 0
+            
+            while (tempID.length >= 2 && index < 8) {
+                val hexByte = tempID.substring(0, 2)
+                val byte = hexByte.toIntOrNull(16)?.toByte()
+                if (byte != null) {
+                    result[index] = byte
+                }
+                tempID = tempID.substring(2)
+                index++
+            }
+            
+            return result
+        }
     }
 }

app/src/main/java/com/bitchat/android/noise/NoiseEncryptionService.kt

@@ -152,7 +152,7 @@ class NoiseEncryptionService(private val context: Context) {
      */
     fun encrypt(data: ByteArray, peerID: String): ByteArray? {
         if (!hasEstablishedSession(peerID)) {
-            Log.w(TAG, "No established session with $peerID, handshake required")
+            Log.w(TAG, "No established session with $peerID, handshake required. TODO: IMPLEMENT HANDSHAKE INIT")
             onHandshakeRequired?.invoke(peerID)
             return null
         }

app/src/main/java/com/bitchat/android/util/BinaryEncodingUtils.kt

@@ -0,0 +1,365 @@
+package com.bitchat.android.util
+
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.util.*
+
+/**
+ * Binary encoding utilities for efficient protocol messages
+ * Compatible with iOS version BinaryEncodingUtils.swift
+ */
+
+// MARK: - Hex Encoding/Decoding Extensions
+
+fun ByteArray.hexEncodedString(): String {
+    if (this.isEmpty()) {
+        return ""
+    }
+    return this.joinToString("") { "%02x".format(it) }
+}
+
+fun String.dataFromHexString(): ByteArray? {
+    val len = this.length / 2
+    val data = ByteArray(len)
+    var index = 0
+    
+    for (i in 0 until len) {
+        val hexByte = this.substring(i * 2, i * 2 + 2)
+        val byte = hexByte.toIntOrNull(16)?.toByte() ?: return null
+        data[index++] = byte
+    }
+    
+    return data
+}
+
+// MARK: - Binary Encoding Utilities
+
+class BinaryDataBuilder {
+    private val _buffer = mutableListOf<Byte>()
+    
+    // Make buffer accessible for direct manipulation when needed
+    val buffer: MutableList<Byte> get() = _buffer
+    
+    // MARK: Writing
+    
+    fun appendUInt8(value: UByte) {
+        buffer.add(value.toByte())
+    }
+    
+    fun appendUInt16(value: UShort) {
+        buffer.add(((value.toInt() shr 8) and 0xFF).toByte())
+        buffer.add((value.toInt() and 0xFF).toByte())
+    }
+    
+    fun appendUInt32(value: UInt) {
+        buffer.add(((value.toLong() shr 24) and 0xFF).toByte())
+        buffer.add(((value.toLong() shr 16) and 0xFF).toByte())
+        buffer.add(((value.toLong() shr 8) and 0xFF).toByte())
+        buffer.add((value.toLong() and 0xFF).toByte())
+    }
+    
+    fun appendUInt64(value: ULong) {
+        for (i in 7 downTo 0) {
+            buffer.add(((value.toLong() shr (i * 8)) and 0xFF).toByte())
+        }
+    }
+    
+    fun appendString(string: String, maxLength: Int = 255) {
+        val data = string.toByteArray(Charsets.UTF_8)
+        val length = minOf(data.size, maxLength)
+        
+        if (maxLength <= 255) {
+            buffer.add(length.toByte())
+        } else {
+            appendUInt16(length.toUShort())
+        }
+        
+        buffer.addAll(data.take(length).toList())
+    }
+    
+    fun appendData(data: ByteArray, maxLength: Int = 65535) {
+        val length = minOf(data.size, maxLength)
+        
+        if (maxLength <= 255) {
+            buffer.add(length.toByte())
+        } else {
+            appendUInt16(length.toUShort())
+        }
+        
+        buffer.addAll(data.take(length).toList())
+    }
+    
+    fun appendDate(date: Date) {
+        val timestamp = (date.time).toULong() // milliseconds
+        appendUInt64(timestamp)
+    }
+    
+    fun appendUUID(uuid: String) {
+        // Convert UUID string to 16 bytes
+        val uuidData = ByteArray(16)
+        
+        val cleanUUID = uuid.replace("-", "")
+        var index = 0
+        
+        for (i in 0 until 16) {
+            if (index + 1 < cleanUUID.length) {
+                val hexByte = cleanUUID.substring(index, index + 2)
+                uuidData[i] = hexByte.toIntOrNull(16)?.toByte() ?: 0
+                index += 2
+            }
+        }
+        
+        buffer.addAll(uuidData.toList())
+    }
+    
+    fun toByteArray(): ByteArray {
+        return buffer.toByteArray()
+    }
+}
+
+// MARK: - Binary Data Reading Extensions
+
+class BinaryDataReader(private val data: ByteArray) {
+    private var offset = 0
+    
+    // MARK: Reading
+    
+    fun readUInt8(): UByte? {
+        if (offset >= data.size) return null
+        val value = data[offset].toUByte()
+        offset += 1
+        return value
+    }
+    
+    fun readUInt16(): UShort? {
+        if (offset + 2 > data.size) return null
+        val value = ((data[offset].toUByte().toInt() shl 8) or 
+                    (data[offset + 1].toUByte().toInt())).toUShort()
+        offset += 2
+        return value
+    }
+    
+    fun readUInt32(): UInt? {
+        if (offset + 4 > data.size) return null
+        val value = ((data[offset].toUByte().toUInt() shl 24) or
+                    (data[offset + 1].toUByte().toUInt() shl 16) or
+                    (data[offset + 2].toUByte().toUInt() shl 8) or
+                    (data[offset + 3].toUByte().toUInt()))
+        offset += 4
+        return value
+    }
+    
+    fun readUInt64(): ULong? {
+        if (offset + 8 > data.size) return null
+        var value = 0UL
+        for (i in 0 until 8) {
+            value = (value shl 8) or data[offset + i].toUByte().toULong()
+        }
+        offset += 8
+        return value
+    }
+    
+    fun readString(maxLength: Int = 255): String? {
+        val length: Int = if (maxLength <= 255) {
+            readUInt8()?.toInt() ?: return null
+        } else {
+            readUInt16()?.toInt() ?: return null
+        }
+        
+        if (offset + length > data.size) return null
+        
+        val stringData = data.sliceArray(offset until offset + length)
+        offset += length
+        
+        return String(stringData, Charsets.UTF_8)
+    }
+    
+    fun readData(maxLength: Int = 65535): ByteArray? {
+        val length: Int = if (maxLength <= 255) {
+            readUInt8()?.toInt() ?: return null
+        } else {
+            readUInt16()?.toInt() ?: return null
+        }
+        
+        if (offset + length > data.size) return null
+        
+        val data = this.data.sliceArray(offset until offset + length)
+        offset += length
+        
+        return data
+    }
+    
+    fun readDate(): Date? {
+        val timestamp = readUInt64() ?: return null
+        return Date(timestamp.toLong())
+    }
+    
+    fun readUUID(): String? {
+        if (offset + 16 > data.size) return null
+        
+        val uuidData = data.sliceArray(offset until offset + 16)
+        offset += 16
+        
+        // Convert 16 bytes to UUID string format
+        val uuid = uuidData.joinToString("") { "%02x".format(it) }
+        
+        // Insert hyphens at proper positions: 8-4-4-4-12
+        val result = StringBuilder()
+        for ((index, char) in uuid.withIndex()) {
+            if (index == 8 || index == 12 || index == 16 || index == 20) {
+                result.append("-")
+            }
+            result.append(char)
+        }
+        
+        return result.toString().uppercase()
+    }
+    
+    fun readFixedBytes(count: Int): ByteArray? {
+        if (offset + count > data.size) return null
+        
+        val data = this.data.sliceArray(offset until offset + count)
+        offset += count
+        
+        return data
+    }
+    
+    // Get current offset position
+    val currentOffset: Int get() = offset
+}
+
+// MARK: - Binary Message Protocol
+
+interface BinaryEncodable {
+    fun toBinaryData(): ByteArray
+}
+
+// MARK: - Message Type Registry
+
+enum class BinaryMessageType(val value: UByte) {
+    DELIVERY_ACK(0x01u),
+    READ_RECEIPT(0x02u),
+    CHANNEL_KEY_VERIFY_REQUEST(0x03u),
+    CHANNEL_KEY_VERIFY_RESPONSE(0x04u),
+    CHANNEL_PASSWORD_UPDATE(0x05u),
+    CHANNEL_METADATA(0x06u),
+    VERSION_HELLO(0x07u),
+    VERSION_ACK(0x08u),
+    NOISE_IDENTITY_ANNOUNCEMENT(0x09u),
+    NOISE_MESSAGE(0x0Au);
+    
+    companion object {
+        fun fromValue(value: UByte): BinaryMessageType? {
+            return values().find { it.value == value }
+        }
+    }
+}
+
+// Extension functions for ByteArray to support iOS-style data manipulation
+fun ByteArray.readUInt8(at: IntArray): UByte? {
+    val offset = at[0]
+    if (offset >= this.size) return null
+    val value = this[offset].toUByte()
+    at[0] += 1
+    return value
+}
+
+fun ByteArray.readUInt16(at: IntArray): UShort? {
+    val offset = at[0]
+    if (offset + 2 > this.size) return null
+    val value = ((this[offset].toUByte().toInt() shl 8) or 
+                (this[offset + 1].toUByte().toInt())).toUShort()
+    at[0] += 2
+    return value
+}
+
+fun ByteArray.readUInt32(at: IntArray): UInt? {
+    val offset = at[0]
+    if (offset + 4 > this.size) return null
+    val value = ((this[offset].toUByte().toUInt() shl 24) or
+                (this[offset + 1].toUByte().toUInt() shl 16) or
+                (this[offset + 2].toUByte().toUInt() shl 8) or
+                (this[offset + 3].toUByte().toUInt()))
+    at[0] += 4
+    return value
+}
+
+fun ByteArray.readUInt64(at: IntArray): ULong? {
+    val offset = at[0]
+    if (offset + 8 > this.size) return null
+    var value = 0UL
+    for (i in 0 until 8) {
+        value = (value shl 8) or this[offset + i].toUByte().toULong()
+    }
+    at[0] += 8
+    return value
+}
+
+fun ByteArray.readString(at: IntArray, maxLength: Int = 255): String? {
+    val length: Int = if (maxLength <= 255) {
+        readUInt8(at)?.toInt() ?: return null
+    } else {
+        readUInt16(at)?.toInt() ?: return null
+    }
+    
+    val offset = at[0]
+    if (offset + length > this.size) return null
+    
+    val stringData = this.sliceArray(offset until offset + length)
+    at[0] += length
+    
+    return String(stringData, Charsets.UTF_8)
+}
+
+fun ByteArray.readData(at: IntArray, maxLength: Int = 65535): ByteArray? {
+    val length: Int = if (maxLength <= 255) {
+        readUInt8(at)?.toInt() ?: return null
+    } else {
+        readUInt16(at)?.toInt() ?: return null
+    }
+    
+    val offset = at[0]
+    if (offset + length > this.size) return null
+    
+    val data = this.sliceArray(offset until offset + length)
+    at[0] += length
+    
+    return data
+}
+
+fun ByteArray.readDate(at: IntArray): Date? {
+    val timestamp = readUInt64(at) ?: return null
+    return Date(timestamp.toLong())
+}
+
+fun ByteArray.readUUID(at: IntArray): String? {
+    val offset = at[0]
+    if (offset + 16 > this.size) return null
+    
+    val uuidData = this.sliceArray(offset until offset + 16)
+    at[0] += 16
+    
+    // Convert 16 bytes to UUID string format
+    val uuid = uuidData.joinToString("") { "%02x".format(it) }
+    
+    // Insert hyphens at proper positions: 8-4-4-4-12
+    val result = StringBuilder()
+    for ((index, char) in uuid.withIndex()) {
+        if (index == 8 || index == 12 || index == 16 || index == 20) {
+            result.append("-")
+        }
+        result.append(char)
+    }
+    
+    return result.toString().uppercase()
+}
+
+fun ByteArray.readFixedBytes(at: IntArray, count: Int): ByteArray? {
+    val offset = at[0]
+    if (offset + count > this.size) return null
+    
+    val data = this.sliceArray(offset until offset + count)
+    at[0] += count
+    
+    return data
+}