diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/internal/MessageDataInternal.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/internal/MessageDataInternal.kt
index ad455e8a0..b70028999 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/internal/MessageDataInternal.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/internal/MessageDataInternal.kt
@@ -225,7 +225,7 @@ fun MessageChain.toPacket(): ByteReadPacket = buildPacket {
                              */
                             writeShortLVPacket {
                                 writeByte(0x02)
-                                //"46 52 25 46 60 30 59 4F 4A 5A 51 48 31 46 4A 53 4C 51 4C 4A 33 46 31 2E 6A 70 67".hexToBytes().stringOfWitch()
+                                //"46 52 25 46 60 30 59 4F 4A 5A 51 48 31 46 4A 53 4C 51 4C 4A 33 46 31 2E 6A 70 67".hexToBytes().encodeToString()
                                 //   writeShortLVString(filename)//图片文件名 FR%F`0YOJZQH1FJSLQLJ3F1.jpg
                                 writeShortLVString(id.value.substring(1..24) + ".gif")// 图片文件名. 后缀不影响. 但无后缀会导致 PC QQ 无法显示这个图片
                                 writeHex("03 00 04 00 00 02 A2 04")
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
index 96c6288a4..deeb94717 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMProtocol.kt
@@ -2,6 +2,7 @@
 
 package net.mamoe.mirai.network.protocol.tim
 
+import net.mamoe.mirai.utils.io.hexToBytes
 import net.mamoe.mirai.utils.solveIpAddress
 
 object TIMProtocol {
@@ -9,32 +10,32 @@ object TIMProtocol {
         //add("183.60.56.29")
         val list = mutableListOf<String>()
         arrayOf(
-                "sz3.tencent.com",
-                "sz4.tencent.com",
-                "sz5.tencent.com",
-                "sz6.tencent.com",
-                "sz8.tencent.com",
-                "sz9.tencent.com",
-                "sz2.tencent.com"
+            "sz3.tencent.com",
+            "sz4.tencent.com",
+            "sz5.tencent.com",
+            "sz6.tencent.com",
+            "sz8.tencent.com",
+            "sz9.tencent.com",
+            "sz2.tencent.com"
         ).forEach { list.add(solveIpAddress(it)) } // 需 IPv4 地址
 
         list.toList()
     }()//不使用lazy, 在初始化时就加载.
 
-    const val head = "02"
-    const val ver = "37 13"// TIM 最新版中这个有时候是 38 03
-    const val fixVer = "03 00 00 00 01 2E 01 00 00 68 52 00 00 00 00"
-    const val tail = "03"
+    val head = "02".hexToBytes()
+    val ver = "37 13".hexToBytes()// TIM 最新版中这个有时候是 38 03
+    val fixVer = "03 00 00 00 01 2E 01 00 00 68 52 00 00 00 00".hexToBytes()
+    val tail = "03".hexToBytes()
     /**
      * _fixVer
      */
-    const val fixVer2 = "02 00 00 00 01 01 01 00 00 68 20"
+    val fixVer2 = "02 00 00 00 01 01 01 00 00 68 20".hexToBytes()
     //                   02 38 03 00 CD 48 68 3E 03 3F A2 02 00 00 00
-    const val version0x02 = "02 00 00 00 01 2E 01 00 00 69 35"
-    const val version0x04 = "04 00 00 00 01 2E 01 00 00 69 35 00 00 00 00 00 00 00 00"
+    val version0x02 = "02 00 00 00 01 2E 01 00 00 69 35".hexToBytes()
+    val version0x04 = "04 00 00 00 01 2E 01 00 00 69 35 00 00 00 00 00 00 00 00".hexToBytes()
 
-    const val constantData1 = "00 18 00 16 00 01 "
-    const val constantData2 = "00 00 04 53 00 00 00 01 00 00 15 85 "
+    val constantData1 = "00 18 00 16 00 01 ".hexToBytes()
+    val constantData2 = "00 00 04 53 00 00 00 01 00 00 15 85 ".hexToBytes()
 
 
     //todo 使用 byte array
@@ -42,7 +43,7 @@ object TIMProtocol {
     /**
      * Touch 发出时写入, 并用于加密, 接受 sendTouch response 时解密.
      */
-    const val touchKey = "A4 F1 91 88 C9 82 14 99 0C 9E 56 55 91 23 C8 3D"//16
+    val touchKey = "A4 F1 91 88 C9 82 14 99 0C 9E 56 55 91 23 C8 3D".hexToBytes()//16
 
 
     //统一替换为了 touchKey
@@ -50,37 +51,38 @@ object TIMProtocol {
     // * Redirection 发出时写入, 并用于加密, 接受 Redirection response 时解密.
     // * 这个 key 似乎是可以任意的.
     // */
-    //const val redirectionKey = "A8 F2 14 5F 58 12 60 AF 07 63 97 D6 76 B2 1A 3B"//16
+    //val redirectionKey = "A8 F2 14 5F 58 12 60 AF 07 63 97 D6 76 B2 1A 3B"//16
 
     /**
      * 并非常量. 设置为常量是为了让 [shareKey] 为常量
      */
-    const val publicKey = "02 6D 28 41 D2 A5 6F D2 FC 3E 2A 1F 03 75 DE 6E 28 8F A8 19 3E 5F 16 49 D3"//25
+    val publicKey = "02 6D 28 41 D2 A5 6F D2 FC 3E 2A 1F 03 75 DE 6E 28 8F A8 19 3E 5F 16 49 D3".hexToBytes()//25
 
     /**
      * 并非常量. 设置为常量是为了让 [shareKey] 为常量
      *
      * LoginResend 和 PasswordSubmission 时写入, 但随后都使用 shareKey 加密, 收到回复也是用的 share key
      */
-    const val key0836 = "EF 4A 36 6A 16 A8 E6 3D 2E EA BD 1F 98 C1 3C DA"//16
+    val key0836 = "EF 4A 36 6A 16 A8 E6 3D 2E EA BD 1F 98 C1 3C DA".hexToBytes()//16
 
     /**
      * 并非常量. 是 publicKey 与 key0836 的算法计算结果
      */
-    //const val shareKey = "5B 6C 91 55 D9 92 F5 A7 99 85 37 76 3D 0F 08 B7"//16
-    const val shareKey = "1A E9 7F 7D C9 73 75 98 AC 02 E0 80 5F A9 C6 AF"//16//original
+    //val shareKey = "5B 6C 91 55 D9 92 F5 A7 99 85 37 76 3D 0F 08 B7"//16
+    val shareKey = "1A E9 7F 7D C9 73 75 98 AC 02 E0 80 5F A9 C6 AF".hexToBytes()//16//original
 
-    const val key00BA = "C1 9C B8 C8 7B 8C 81 BA 9E 9E 7A 89 E1 7A EC 94"
-    const val key00BAFix = "69 20 D1 14 74 F5 B3 93 E4 D5 02 B3 71 1A CD 2A"
+    val key00BA = "C1 9C B8 C8 7B 8C 81 BA 9E 9E 7A 89 E1 7A EC 94".hexToBytes()
+    val key00BAFix = "69 20 D1 14 74 F5 B3 93 E4 D5 02 B3 71 1A CD 2A".hexToBytes()
 
     /**
      * 0836_622_fix2
      */
-    const val passwordSubmissionTLV2 = "00 15 00 30 00 01 01 27 9B C7 F5 00 10 65 03 FD 8B 00 00 00 00 00 00 00 00 00 00 00 00 02 90 49 55 33 00 10 15 74 C4 89 85 7A 19 F5 5E A9 C9 A3 5E 8A 5A 9B"
+    val passwordSubmissionTLV2 =
+        "00 15 00 30 00 01 01 27 9B C7 F5 00 10 65 03 FD 8B 00 00 00 00 00 00 00 00 00 00 00 00 02 90 49 55 33 00 10 15 74 C4 89 85 7A 19 F5 5E A9 C9 A3 5E 8A 5A 9B".hexToBytes()
     /**
      * 0836_622_fix1
      */
-    const val passwordSubmissionTLV1 = "03 00 00 00 01 01 01 00 00 68 20 00 00 00 00 00 01 01 03"//19
+    val passwordSubmissionTLV1 = "03 00 00 00 01 01 01 00 00 68 20 00 00 00 00 00 01 01 03".hexToBytes()//19
     //               最新版              03 00 00 00 01 2E 01 00 00 69 35 00 00 00 00 00 02 01 03
     //               第一版 1.0.2        03 00 00 00 01 2E 01 00 00 68 13 00 00 00 00 00 02 01 03
     //                  1.0.4           03 00 00 00 01 2E 01 00 00 68 27 00 00 00 00 00 02 01 03
@@ -91,7 +93,7 @@ object TIMProtocol {
      * 发送/接受消息中的一个const (?)
      * length=15
      */
-    const val messageConst1 = "00 00 0C E5 BE AE E8 BD AF E9 9B 85 E9 BB 91"
-    const val messageConstNewest = "22 00 0C E5 BE AE E8 BD AF E9 9B 85 E9 BB 91"
+    val messageConst1 = "00 00 0C E5 BE AE E8 BD AF E9 9B 85 E9 BB 91".hexToBytes()
+    val messageConstNewest = "22 00 0C E5 BE AE E8 BD AF E9 9B 85 E9 BB 91".hexToBytes()
     //               TIM最新   22 00 0C E5 BE AE E8 BD AF E9 9B 85 E9 BB 91
 }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/OutgoingPacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/OutgoingPacket.kt
index da66ca18b..4f380189b 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/OutgoingPacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/OutgoingPacket.kt
@@ -2,14 +2,10 @@
 
 package net.mamoe.mirai.network.protocol.tim.packet
 
-import kotlinx.io.core.BytePacketBuilder
-import kotlinx.io.core.ByteReadPacket
-import kotlinx.io.core.use
-import kotlinx.io.core.writeUShort
+import kotlinx.io.core.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
 import net.mamoe.mirai.utils.io.encryptAndWrite
-import net.mamoe.mirai.utils.io.writeHex
 import net.mamoe.mirai.utils.io.writeQQ
 import kotlin.jvm.JvmOverloads
 
@@ -55,12 +51,12 @@ fun PacketFactory<*, *>.buildOutgoingPacket(
 ): OutgoingPacket {
     BytePacketBuilder(headerSizeHint).use {
         with(it) {
-            writeHex(TIMProtocol.head)
-            writeHex(TIMProtocol.ver)
+            writeFully(TIMProtocol.head)
+            writeFully(TIMProtocol.ver)
             writeUShort(id.value)
             writeUShort(sequenceId)
             block(this)
-            writeHex(TIMProtocol.tail)
+            writeFully(TIMProtocol.tail)
         }
         return OutgoingPacket(name, id, sequenceId, it.build())
     }
@@ -80,10 +76,11 @@ fun PacketFactory<*, *>.buildSessionPacket(
     id: PacketId = this.id,
     sequenceId: UShort = PacketFactory.atomicNextSequenceId(),
     headerSizeHint: Int = 0,
+    version: ByteArray = TIMProtocol.version0x02,
     block: BytePacketBuilder.() -> Unit
 ): OutgoingPacket = buildOutgoingPacket(name, id, sequenceId, headerSizeHint) {
     writeQQ(bot)
-    writeHex(TIMProtocol.version0x02)
+    writeFully(version)
     encryptAndWrite(sessionKey) {
         block()
     }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/Profile.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/Profile.kt
index 56199342d..4b9e4d1f1 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/Profile.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/Profile.kt
@@ -62,9 +62,9 @@ object RequestProfileDetailsPacket : SessionPacketFactory<RequestProfileDetailsR
         val map = readTLVMap(tagSize = 2, expectingEOF = true)
         val profile = Profile(
             qq = qq,
-            nickname = map[0x4E22u]?.stringOfWitch() ?: "",//error("Cannot determine nickname")
-            zipCode = map[0x4E25u]?.stringOfWitch(),
-            phone = map[0x4E27u]?.stringOfWitch(),
+            nickname = map[0x4E22u]?.encodeToString() ?: "",//error("Cannot determine nickname")
+            zipCode = map[0x4E25u]?.encodeToString(),
+            phone = map[0x4E27u]?.encodeToString(),
             gender = when (map[0x4E29u]?.let { it[0] }?.toUInt()) {
                 null -> Gender.SECRET //error("Cannot determine gender, entry 0x4E29u not found")
                 0x02u -> Gender.FEMALE
@@ -73,11 +73,11 @@ object RequestProfileDetailsPacket : SessionPacketFactory<RequestProfileDetailsR
                 //else -> error("Cannot determine gender, bad value of 0x4E29u: ${map[0x4729u]!![0].toUHexString()}")
             },
             birthday = map[0x4E3Fu]?.let { Date(it.toUInt().toInt()) },
-            personalStatus = map[0x4E33u]?.stringOfWitch(),
-            homepage = map[0x4E2Du]?.stringOfWitch(),
-            company = map[0x5DC8u]?.stringOfWitch(),
-            school = map[0x4E35u]?.stringOfWitch(),
-            email = map[0x4E2Bu]?.stringOfWitch()
+            personalStatus = map[0x4E33u]?.encodeToString(),
+            homepage = map[0x4E2Du]?.encodeToString(),
+            company = map[0x5DC8u]?.encodeToString(),
+            school = map[0x4E35u]?.encodeToString(),
+            email = map[0x4E2Bu]?.encodeToString()
         )
         map.clear()
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/SendFriendMessagePacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/SendFriendMessagePacket.kt
index 9a2ce6456..45290cc94 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/SendFriendMessagePacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/SendFriendMessagePacket.kt
@@ -49,7 +49,7 @@ object SendFriendMessagePacket : SessionPacketFactory<SendFriendMessagePacket.Re
         writeTime()
         writeRandom(4)
         writeHex("00 00 00 00 0C 00 86")
-        writeHex(TIMProtocol.messageConstNewest)
+        writeFully(TIMProtocol.messageConstNewest)
         writeZero(2)
 
         writePacket(message.toPacket())
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/event/EventPacketFactory.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/event/EventPacketFactory.kt
index 521c3a0cd..1e347d834 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/event/EventPacketFactory.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/event/EventPacketFactory.kt
@@ -11,7 +11,6 @@ import net.mamoe.mirai.network.sessionKey
 import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.utils.io.encryptAndWrite
 import net.mamoe.mirai.utils.io.readIoBuffer
-import net.mamoe.mirai.utils.io.writeHex
 import net.mamoe.mirai.utils.io.writeQQ
 
 /**
@@ -77,7 +76,7 @@ object EventPacketFactory : PacketFactory<Packet, SessionKey>(SessionKey) {
         identity: EventPacketIdentity
     ): OutgoingPacket = buildOutgoingPacket(name = "EventPacket", id = id, sequenceId = sequenceId) {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer2)
+        writeFully(TIMProtocol.fixVer2)
         encryptAndWrite(sessionKey) {
             writeEventPacketIdentity(identity)
         }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Captcha.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Captcha.kt
index af7a9a771..b87d799da 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Captcha.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Captcha.kt
@@ -6,10 +6,13 @@ import kotlinx.io.core.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
 import net.mamoe.mirai.network.protocol.tim.packet.*
-import net.mamoe.mirai.utils.io.*
+import net.mamoe.mirai.utils.io.encryptAndWrite
+import net.mamoe.mirai.utils.io.readIoBuffer
+import net.mamoe.mirai.utils.io.writeHex
+import net.mamoe.mirai.utils.io.writeQQ
 
 object CaptchaKey : DecrypterByteArray, DecrypterType<CaptchaKey> {
-    override val value: ByteArray = TIMProtocol.key00BA.hexToBytes(withCache = false)
+    override val value: ByteArray = TIMProtocol.key00BA
 }
 
 @AnnotatedId(KnownPacketId.CAPTCHA)
@@ -24,21 +27,21 @@ object CaptchaPacket : PacketFactory<CaptchaPacket.CaptchaResponse, CaptchaKey>(
         token00BA: ByteArray
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer)
-        writeHex(TIMProtocol.key00BA)
+        writeFully(TIMProtocol.fixVer)
+        writeFully(TIMProtocol.key00BA)
         encryptAndWrite(TIMProtocol.key00BA) {
             writeHex("00 02 00 00 08 04 01 E0")
-            writeHex(TIMProtocol.constantData2)
+            writeFully(TIMProtocol.constantData2)
             writeHex("00 00 38")
             writeFully(token0825)
             writeHex("01 03 00 19")
-            writeHex(TIMProtocol.publicKey)
+            writeFully(TIMProtocol.publicKey)
             writeHex("13 00 05 00 00 00 00")
             writeUByte(captchaSequence.toUByte())
             writeHex("00 28")
             writeFully(token00BA)
             writeHex("00 10")
-            writeHex(TIMProtocol.key00BAFix)
+            writeFully(TIMProtocol.key00BAFix)
         }
     }
 
@@ -50,17 +53,17 @@ object CaptchaPacket : PacketFactory<CaptchaPacket.CaptchaResponse, CaptchaKey>(
         token0825: ByteArray
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer)
-        writeHex(TIMProtocol.key00BA)
+        writeFully(TIMProtocol.fixVer)
+        writeFully(TIMProtocol.key00BA)
         encryptAndWrite(TIMProtocol.key00BA) {
             writeHex("00 02 00 00 08 04 01 E0")
-            writeHex(TIMProtocol.constantData2)
+            writeFully(TIMProtocol.constantData2)
             writeHex("00 00 38")
             writeFully(token0825)
             writeHex("01 03 00 19")
-            writeHex(TIMProtocol.publicKey)
+            writeFully(TIMProtocol.publicKey)
             writeHex("13 00 05 00 00 00 00 00 00 00 00 10")
-            writeHex(TIMProtocol.key00BAFix)
+            writeFully(TIMProtocol.key00BAFix)
         }
     }
 
@@ -75,17 +78,17 @@ object CaptchaPacket : PacketFactory<CaptchaPacket.CaptchaResponse, CaptchaKey>(
     ): OutgoingPacket = buildOutgoingPacket {
         require(captcha.length == 4) { "captcha.length must == 4" }
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer)
-        writeHex(TIMProtocol.key00BA)
+        writeFully(TIMProtocol.fixVer)
+        writeFully(TIMProtocol.key00BA)
         encryptAndWrite(TIMProtocol.key00BA) {
             writeHex("00 02 00 00 08 04 01 E0")
-            writeHex(TIMProtocol.constantData2)
+            writeFully(TIMProtocol.constantData2)
             writeHex("01 00 38")
             writeFully(token0825)
             writeHex("01 03")
 
             writeShort(25)
-            writeHex(TIMProtocol.publicKey)//25
+            writeFully(TIMProtocol.publicKey)//25
 
             writeHex("14 00 05 00 00 00 00 00 04")
             writeStringUtf8(captcha.toUpperCase())
@@ -93,7 +96,7 @@ object CaptchaPacket : PacketFactory<CaptchaPacket.CaptchaResponse, CaptchaKey>(
             writeFully(captchaToken)
 
             writeShort(16)
-            writeHex(TIMProtocol.key00BAFix)//16
+            writeFully(TIMProtocol.key00BAFix)//16
         }
     }
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ChangeOnlineStatusPacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ChangeOnlineStatusPacket.kt
index 97d924a97..a553546c6 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ChangeOnlineStatusPacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ChangeOnlineStatusPacket.kt
@@ -3,6 +3,7 @@
 package net.mamoe.mirai.network.protocol.tim.packet.login
 
 import kotlinx.io.core.ByteReadPacket
+import kotlinx.io.core.writeFully
 import kotlinx.io.core.writeUByte
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
@@ -23,7 +24,7 @@ object ChangeOnlineStatusPacket : PacketFactory<ChangeOnlineStatusPacket.ChangeO
         loginStatus: OnlineStatus
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer2)
+        writeFully(TIMProtocol.fixVer2)
         encryptAndWrite(sessionKey) {
             writeHex("01 00")
             writeUByte(loginStatus.id)
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Heartbeat.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Heartbeat.kt
index 60567df5e..c25095df5 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Heartbeat.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Heartbeat.kt
@@ -3,6 +3,7 @@
 package net.mamoe.mirai.network.protocol.tim.packet.login
 
 import kotlinx.io.core.ByteReadPacket
+import kotlinx.io.core.writeFully
 import net.mamoe.mirai.event.Subscribable
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
@@ -19,7 +20,7 @@ object HeartbeatPacket : SessionPacketFactory<HeartbeatPacketResponse>() {
         sessionKey: SessionKey
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer)
+        writeFully(TIMProtocol.fixVer)
         encryptAndWrite(sessionKey) {
             writeHex("00 01 00 01")
         }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
index 966c4795a..fb00cd76f 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/PasswordSubmission.kt
@@ -14,7 +14,7 @@ import net.mamoe.mirai.utils.io.*
 import net.mamoe.mirai.utils.writeCRC32
 
 object ShareKey : DecrypterByteArray, DecrypterType<ShareKey> {
-    override val value: ByteArray = TIMProtocol.shareKey.hexToBytes(withCache = false)
+    override val value: ByteArray = TIMProtocol.shareKey
 }
 
 inline class PrivateKey(override val value: ByteArray) : DecrypterByteArray {
@@ -58,10 +58,10 @@ object SubmitPasswordPacket : PacketFactory<SubmitPasswordPacket.LoginResponse,
         tlv0006: IoBuffer? = null
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.passwordSubmissionTLV1)
-        writeShort(25); writeHex(TIMProtocol.publicKey)//=25
+        writeFully(TIMProtocol.passwordSubmissionTLV1)
+        writeShort(25); writeFully(TIMProtocol.publicKey)//=25
         writeZero(2)
-        writeShort(16); writeHex(TIMProtocol.key0836)//=16
+        writeShort(16); writeFully(TIMProtocol.key0836)//=16
 
         // shareKey 极大可能为 publicKey, key0836 计算得到
         encryptAndWrite(TIMProtocol.shareKey) {
@@ -286,12 +286,12 @@ private fun BytePacketBuilder.writePart1(
         this.writeTLV0006(qq, password, loginTime, loginIP, privateKey)
     }
     //fix
-    this.writeHex(TIMProtocol.passwordSubmissionTLV2)
+    this.writeFully(TIMProtocol.passwordSubmissionTLV2)
     this.writeHex("00 1A")//tag
     this.writeHex("00 40")//length
-    this.writeFully(TIMProtocol.passwordSubmissionTLV2.hexToBytes().encryptBy(privateKey))
-    this.writeHex(TIMProtocol.constantData1)
-    this.writeHex(TIMProtocol.constantData2)
+    this.writeFully(TIMProtocol.passwordSubmissionTLV2.encryptBy(privateKey))
+    this.writeFully(TIMProtocol.constantData1)
+    this.writeFully(TIMProtocol.constantData2)
     this.writeQQ(qq)
     this.writeZero(4)
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/SKey.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/SKey.kt
index 111ebf5b7..967f33452 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/SKey.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/SKey.kt
@@ -4,6 +4,7 @@ package net.mamoe.mirai.network.protocol.tim.packet.login
 
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
+import kotlinx.io.core.writeFully
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.BotSession
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
@@ -24,7 +25,7 @@ object RequestSKeyPacket : SessionPacketFactory<SKey>() {
         sessionKey: SessionKey
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer2)
+        writeFully(TIMProtocol.fixVer2)
         encryptAndWrite(sessionKey) {
             writeHex("33 00 05 00 08 74 2E 71 71 2E 63 6F 6D 00 0A 71 75 6E 2E 71 71 2E 63 6F 6D 00 0C 71 7A 6F 6E 65 2E 71 71 2E 63 6F 6D 00 0C 6A 75 62 61 6F 2E 71 71 2E 63 6F 6D 00 09 6B 65 2E 71 71 2E 63 6F 6D")
         }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Session.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Session.kt
index 0f11af402..5c98eb1dc 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Session.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Session.kt
@@ -31,8 +31,8 @@ object RequestSessionPacket : PacketFactory<RequestSessionPacket.SessionKeyRespo
             writeHex("01 92 A5 D2 59 00 10 54 2D CF 9B 60 BF BB EC 0D D4 81 CE 36 87 DE 35 02 AE 6D ED DC 00 10 ")
             writeHex("06 A9 12 97 B7 F8 76 25 AF AF D3 EA B4 C8 BC E7")//fix0836
             writeHex("00 36 00 12 00 02 00 01 00 00 00 05 00 00 00 00 00 00 00 00 00 00")
-            writeHex(TIMProtocol.constantData1)
-            writeHex(TIMProtocol.constantData2)
+            writeFully(TIMProtocol.constantData1)
+            writeFully(TIMProtocol.constantData2)
             writeQQ(bot)
             writeHex("00 00 00 00 00 1F 00 22 00 01")
             writeHex("1A 68 73 66 E4 BA 79 92 CC C2 D4 EC 14 7C 8B AF 43 B0 62 FB 65 58 A9 EB 37 55 1D 26 13 A8 E5 3D")//device ID
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Touch.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Touch.kt
index cbfe59c20..091a3e660 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Touch.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/Touch.kt
@@ -5,13 +5,14 @@ package net.mamoe.mirai.network.protocol.tim.packet.login
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import kotlinx.io.core.readBytes
+import kotlinx.io.core.writeFully
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMProtocol
 import net.mamoe.mirai.network.protocol.tim.packet.*
 import net.mamoe.mirai.utils.io.*
 
 object TouchKey : DecrypterByteArray, DecrypterType<TouchKey> {
-    override val value: ByteArray = TIMProtocol.touchKey.hexToBytes(withCache = false)
+    override val value: ByteArray = TIMProtocol.touchKey
 }
 
 /**
@@ -27,12 +28,12 @@ object TouchPacket : PacketFactory<TouchPacket.TouchResponse, TouchKey>(TouchKey
         isRedirect: Boolean
     ): OutgoingPacket = buildOutgoingPacket {
         writeQQ(bot)
-        writeHex(TIMProtocol.fixVer)
-        writeHex(TIMProtocol.touchKey)
+        writeFully(TIMProtocol.fixVer)
+        writeFully(TIMProtocol.touchKey)
 
         encryptAndWrite(TIMProtocol.touchKey) {
-            writeHex(TIMProtocol.constantData1)
-            writeHex(TIMProtocol.constantData2)
+            writeFully(TIMProtocol.constantData1)
+            writeFully(TIMProtocol.constantData2)
             writeQQ(bot)
             writeHex(if (isRedirect) "00 01 00 00 03 09 00 0C 00 01" else "00 00 00 00 03 09 00 08 00 01")
             writeIP(serverIp)
@@ -40,7 +41,7 @@ object TouchPacket : PacketFactory<TouchPacket.TouchResponse, TouchKey>(TouchKey
                 if (isRedirect) "01 6F A1 58 22 01 00 36 00 12 00 02 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 14 00 1D 01 03 00 19"
                 else "00 02 00 36 00 12 00 02 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 14 00 1D 01 02 00 19"
             )
-            writeHex(TIMProtocol.publicKey)
+            writeFully(TIMProtocol.publicKey)
         }
     }