diff --git a/UpdateLog.md b/UpdateLog.md
index 23a8309b0..d640714d8 100644
--- a/UpdateLog.md
+++ b/UpdateLog.md
@@ -1,10 +1,18 @@
-# UpdateLog
-
-## Major version 0
+# Major version 0
 
 开发版本. 频繁更新, 不保证高稳定性
 
-### `0.10.0`  *2019/12/23*
+## `0.10.1` 还未发布
+**Bot 构造**
+`Bot` 构造时修改 `BotConfiguration` 而不是登录时.
+移除 `CoroutineScope.Bot`
+移除 `suspend Bot(...)`
+添加 `Bot(..., BotConfiguration.() -> Unit)`
+
+**其他**
+移动部分文件, 模块化
+
+## `0.10.0`  *2019/12/23*
 **事件优化**  
 更快的监听过程  
 现在监听不再是 `suspend`, 而必须显式指定 `CoroutineScope`. 详见 [`Subscribers.kt`](mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Subscribers.kt#L69)  
@@ -13,7 +21,7 @@
 **其他**  
 `Contact` 现在实现接口 `CoroutineScope`
 
-### `0.9.0`  *2019/12/20*
+## `0.9.0`  *2019/12/20*
 **协议模块独立**  
 现在 `mirai-core` 只提供基础的抽象类. 具体的各协议实现为 `mirai-core-PROTOCOL`.  
 这些模块都继承自 `mirai-core`.  
@@ -35,15 +43,15 @@
 **此为 API 不兼容更新**, 请将所有无符号标志 `u` 删除即可. 如 `123456u` 改为 `123456`
 
 另还有其他 API 的包名或签名修改. 请使用 IDE 自动修补 import 即可.
-### `0.8.2`  *2019/12/15*
+## `0.8.2`  *2019/12/15*
 - 修复 GroupId.toGroupInternalId 错误
 - 修复解析群消息时小概率出现的一个错误
 
-### `0.8.1`  *2019/12/15*
+## `0.8.1`  *2019/12/15*
 - 修复有时群资料无法获取的情况
 - 现在 `At.qq`, `Long.qq` 等函数不再是 `suspend`
 
-### `0.8.0`  *2019/12/14*
+## `0.8.0`  *2019/12/14*
 协议
 - 现在查询群资料时可处理群号无效的情况
 - 现在能正常分辨禁言事件包
@@ -56,28 +64,28 @@
 优化
 - 日志中, 发送给服务器的包将会被以名字记录, 而不是 id
 
-### `0.7.5`  *2019/12/09*
+## `0.7.5`  *2019/12/09*
 - 修复验证码包发出后无回复 (错误的验证码包)
 
-### `0.7.4`  *2019/12/08*
+## `0.7.4`  *2019/12/08*
 - 修复 bug
 - 优化 JVM 平台上需要验证码时的提示
 
-### `0.7.3`  *2019/12/07*
+## `0.7.3`  *2019/12/07*
 - 删除 klock 依赖, 添加 Time.kt. 待将来 kotlin Duration 稳定后替换为 Duration
 
-### `0.7.2`  *2019/12/07*
+## `0.7.2`  *2019/12/07*
 - 使所有协议相关类 `internal`
 - 去掉一些 `close` 的不应该有的 `suspend`
 - `QQ`, `Member`, `Group` 现在继承接口 `CoroutineScope`
 - 将 `LoginResult` 由 `inline class` 修改为 `enum class`
 - 添加和修改了 `BotAccount` 和 `Bot` 的构造器
 
-### `0.7.1`  *2019/12/05*  
+## `0.7.1`  *2019/12/05*
 - 修复禁言时间范围错误的问题
 - 禁言的扩展函数现在会传递实际函数的返回值
 
-### `0.7.0`  *2019/12/04*  
+## `0.7.0`  *2019/12/04*
 协议  
 - 重新分析验证码包, 解决一些无法解析的情况. (这可能会产生新的问题, 遇到后请提交 issue)
 - 重新分析提交密码包
@@ -97,11 +105,11 @@
 -  2 个 Contact.sendMessage 重载改为内联扩展函数 **(需要添加 import)**
 - 其他小优化
 
-### `0.6.1`  *2019/12/03*
+## `0.6.1`  *2019/12/03*
 - 新增: 无法解析密码包/验证码包时的调试输出. 以兼容更多的设备情况
 - 新增: `MessagePacket` 下 `At.qq()` 捷径获取 QQ
 
-### `0.6.0`  *2019/12/02*
+## `0.6.0`  *2019/12/02*
 - 新增: 禁言群成员 (`Member.mute(TimeSpan|Duration|MonthsSpan|Int|UInt)`)
 - 新增: 解禁群成员 (`Member.unmute()`)
 - 修复: ContactList key 无法匹配 (Kotlin 内联类型泛型投影错误)
diff --git a/mirai-core-timpc/build.gradle.kts b/mirai-core-timpc/build.gradle.kts
index c06f791ca..5bd3ddc9d 100644
--- a/mirai-core-timpc/build.gradle.kts
+++ b/mirai-core-timpc/build.gradle.kts
@@ -104,7 +104,7 @@ kotlin {
                 api(kotlin("test-junit", kotlinVersion))
                 implementation("org.pcap4j:pcap4j-distribution:1.8.2")
 
-                //runtimeOnly(files("build/classes/kotlin/jvm/test")) // classpath is not properly set by IDE
+                runtimeOnly(files("build/classes/kotlin/jvm/test")) // classpath is not properly set by IDE
             }
         }
     }
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/TIMPCBot.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/TIMPCBot.kt
index 11b2a4140..396fe0171 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/TIMPCBot.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/TIMPCBot.kt
@@ -11,9 +11,6 @@ import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.message.data.Image
 import net.mamoe.mirai.message.data.ImageId0x03
 import net.mamoe.mirai.message.data.ImageId0x06
-import net.mamoe.mirai.network.packet.KnownPacketId
-import net.mamoe.mirai.network.packet.OutgoingPacket
-import net.mamoe.mirai.network.packet.SessionKey
 import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.timpc.internal.RawGroupInfo
 import net.mamoe.mirai.timpc.network.GroupImpl
@@ -21,13 +18,15 @@ import net.mamoe.mirai.timpc.network.MemberImpl
 import net.mamoe.mirai.timpc.network.QQImpl
 import net.mamoe.mirai.timpc.network.TIMPCBotNetworkHandler
 import net.mamoe.mirai.timpc.network.handler.TemporaryPacketHandler
+import net.mamoe.mirai.timpc.network.packet.KnownPacketId
+import net.mamoe.mirai.timpc.network.packet.OutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.SessionKey
 import net.mamoe.mirai.timpc.network.packet.action.*
 import net.mamoe.mirai.timpc.network.packet.event.EventPacketFactory
 import net.mamoe.mirai.timpc.network.packet.event.FriendOnlineStatusChangedPacket
 import net.mamoe.mirai.timpc.network.packet.login.*
 import net.mamoe.mirai.timpc.utils.assertUnreachable
 import net.mamoe.mirai.utils.*
-import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
 import net.mamoe.mirai.utils.io.logStacktrace
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/ContactImpl.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/ContactImpl.kt
index 34cf17c6c..fcb31dea9 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/ContactImpl.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/ContactImpl.kt
@@ -20,10 +20,14 @@ import net.mamoe.mirai.timpc.network.packet.action.*
 import net.mamoe.mirai.timpc.network.packet.event.MemberJoinEventPacket
 import net.mamoe.mirai.timpc.network.packet.event.MemberQuitEvent
 import net.mamoe.mirai.timpc.sendPacket
+import net.mamoe.mirai.utils.OverFileSizeMaxException
 import net.mamoe.mirai.timpc.utils.assertUnreachable
 import net.mamoe.mirai.timpc.withTIMPCBot
-import net.mamoe.mirai.utils.*
+import net.mamoe.mirai.utils.ExternalImage
+import net.mamoe.mirai.utils.Http
+import net.mamoe.mirai.utils.MiraiInternalAPI
 import net.mamoe.mirai.utils.io.toUHexString
+import net.mamoe.mirai.utils.unsafeWeakRef
 import kotlin.coroutines.CoroutineContext
 
 internal sealed class ContactImpl : Contact {
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/TIMPCBotNetworkHandler.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/TIMPCBotNetworkHandler.kt
index eb34395d1..64fbe77d9 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/TIMPCBotNetworkHandler.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/TIMPCBotNetworkHandler.kt
@@ -7,6 +7,7 @@ import kotlinx.io.core.*
 import kotlinx.io.pool.useInstance
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.data.LoginResult
+import net.mamoe.mirai.data.OnlineStatus
 import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.event.BroadcastControllable
 import net.mamoe.mirai.event.Cancellable
@@ -14,15 +15,17 @@ import net.mamoe.mirai.event.Subscribable
 import net.mamoe.mirai.event.broadcast
 import net.mamoe.mirai.event.events.BotLoginSucceedEvent
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.timpc.TIMPCBot
 import net.mamoe.mirai.timpc.network.handler.DataPacketSocketAdapter
 import net.mamoe.mirai.timpc.network.handler.TemporaryPacketHandler
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.timpc.network.packet.login.*
 import net.mamoe.mirai.utils.LockFreeLinkedList
 import net.mamoe.mirai.utils.LoginFailedException
-import net.mamoe.mirai.utils.OnlineStatus
+import net.mamoe.mirai.utils.NoLog
+import net.mamoe.mirai.utils.cryptor.Decrypter
+import net.mamoe.mirai.utils.cryptor.NoDecrypter
 import net.mamoe.mirai.utils.io.*
 import net.mamoe.mirai.utils.unsafeWeakRef
 import kotlin.coroutines.CoroutineContext
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/OutgoingPacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacket.kt
similarity index 93%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/OutgoingPacket.kt
rename to mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacket.kt
index 24d65cf18..0b9f50697 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/OutgoingPacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacket.kt
@@ -1,13 +1,15 @@
 @file:Suppress("EXPERIMENTAL_API_USAGE", "EXPERIMENTAL_UNSIGNED_LITERALS", "unused", "MemberVisibilityCanBePrivate")
 
-package net.mamoe.mirai.network.packet
+package net.mamoe.mirai.timpc.network.packet
 
 import kotlinx.io.core.*
 import kotlinx.serialization.SerializationStrategy
 import kotlinx.serialization.protobuf.ProtoBuf
 import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.network.BotNetworkHandler
+
 import net.mamoe.mirai.utils.MiraiInternalAPI
+import net.mamoe.mirai.utils.cryptor.encryptAndWrite
 import net.mamoe.mirai.utils.io.hexToBytes
 import net.mamoe.mirai.utils.io.writeQQ
 import kotlin.contracts.ExperimentalContracts
@@ -63,17 +65,14 @@ inline fun PacketFactory<*, *>.buildOutgoingPacket0(
         callsInPlace(block, InvocationKind.EXACTLY_ONCE)
     }
 
-    BytePacketBuilder(headerSizeHint).use {
-        with(it) {
-            writeFully(head)
-            writeFully(ver)
-            writeUShort(id.value)
-            writeUShort(sequenceId)
-            block(this)
-            writeFully(tail)
-        }
-        return OutgoingPacket(name, id, sequenceId, it.build())
-    }
+    return OutgoingPacket(name, id, sequenceId, buildPacket(headerSizeHint) {
+        writeFully(head)
+        writeFully(ver)
+        writeUShort(id.value.toUShort())
+        writeUShort(sequenceId)
+        block(this)
+        writeFully(tail)
+    })
 }
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacketHelper.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacketHelper.kt
index e61bb9389..19cec0801 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacketHelper.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/OutgoingPacketHelper.kt
@@ -2,7 +2,7 @@ package net.mamoe.mirai.timpc.network.packet
 
 import kotlinx.io.core.BytePacketBuilder
 import kotlinx.serialization.SerializationStrategy
-import net.mamoe.mirai.network.packet.*
+
 import net.mamoe.mirai.timpc.network.TIMProtocol
 import net.mamoe.mirai.utils.MiraiInternalAPI
 import kotlin.contracts.ExperimentalContracts
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Packet.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/Packet.kt
similarity index 93%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Packet.kt
rename to mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/Packet.kt
index 0eedef402..be1d6ca8d 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Packet.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/Packet.kt
@@ -1,4 +1,4 @@
-package net.mamoe.mirai.network.packet
+package net.mamoe.mirai.timpc.network.packet
 
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.readBytes
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketFactory.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketFactory.kt
similarity index 83%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketFactory.kt
rename to mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketFactory.kt
index d20c98dda..fdfaefeda 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketFactory.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketFactory.kt
@@ -1,7 +1,8 @@
 @file:Suppress("EXPERIMENTAL_API_USAGE", "EXPERIMENTAL_UNSIGNED_LITERALS")
 
-package net.mamoe.mirai.network.packet
+package net.mamoe.mirai.timpc.network.packet
 
+import kotlinx.atomicfu.AtomicInt
 import kotlinx.atomicfu.atomic
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
@@ -9,14 +10,16 @@ import kotlinx.io.core.readBytes
 import kotlinx.io.pool.useInstance
 import kotlinx.serialization.DeserializationStrategy
 import kotlinx.serialization.protobuf.ProtoBuf
-import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.utils.MiraiInternalAPI
+import net.mamoe.mirai.network.BotNetworkHandler
+import net.mamoe.mirai.utils.cryptor.Decrypter
+import net.mamoe.mirai.utils.cryptor.DecrypterType
+import net.mamoe.mirai.utils.cryptor.readProtoMap
 import net.mamoe.mirai.utils.io.ByteArrayPool
 import net.mamoe.mirai.utils.io.debugPrint
 import net.mamoe.mirai.utils.io.read
 import net.mamoe.mirai.utils.io.toUHexString
-import net.mamoe.mirai.utils.readProtoMap
+
 
 /**
  * 一种数据包的处理工厂. 它可以解密解码服务器发来的这个包, 也可以编码加密要发送给服务器的这个包
@@ -40,7 +43,6 @@ abstract class PacketFactory<out TPacket : Packet, TDecrypter : Decrypter>(val d
      */
     abstract suspend fun ByteReadPacket.decode(id: PacketId, sequenceId: UShort, handler: BotNetworkHandler): TPacket
 
-    @Suppress("DEPRECATION")
     fun <T> ByteReadPacket.decodeProtoPacket(
         deserializer: DeserializationStrategy<T>,
         debuggingTag: String? = null
@@ -63,10 +65,16 @@ abstract class PacketFactory<out TPacket : Packet, TDecrypter : Decrypter>(val d
     }
 
     companion object {
-        private val sequenceIdInternal = atomic(1)
+        private val sequenceId: AtomicInt = atomic(1)
 
-        @MiraiInternalAPI
-        fun atomicNextSequenceId(): UShort = sequenceIdInternal.getAndIncrement().toUShort()
+        fun atomicNextSequenceId(): UShort {
+            val id = sequenceId.getAndAdd(1)
+            if (id > Short.MAX_VALUE.toInt() * 2) {
+                sequenceId.value = 0
+                return atomicNextSequenceId()
+            }
+            return id.toUShort()
+        }
     }
 }
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketId.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketId.kt
similarity index 93%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketId.kt
rename to mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketId.kt
index ae651f4d3..2bee326eb 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/PacketId.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/PacketId.kt
@@ -1,10 +1,19 @@
 @file:Suppress("EXPERIMENTAL_API_USAGE", "EXPERIMENTAL_UNSIGNED_LITERALS")
 
-package net.mamoe.mirai.network.packet
+package net.mamoe.mirai.timpc.network.packet
+
 
 import net.mamoe.mirai.utils.io.toUHexString
 
 
+/**
+ * 包 ID.
+ */
+interface PacketId {
+    val value: UShort
+    val factory: PacketFactory<*, *>
+}
+
 /**
  * 通过 [value] 匹配一个 [IgnoredPacketId] 或 [KnownPacketId], 无匹配则返回一个 [UnknownPacketId].
  */
@@ -13,13 +22,6 @@ fun matchPacketId(value: UShort): PacketId =
         ?: KnownPacketId.entries.firstOrNull { it.value.value == value }?.value
         ?: UnknownPacketId(value)
 
-/**
- * 包 ID.
- */
-interface PacketId {
-    val value: UShort
-    val factory: PacketFactory<*, *>
-}
 
 /**
  * 用于代表 `null`. 调用任何属性时都将会得到一个 [error]
@@ -49,7 +51,8 @@ inline class IgnoredPacketId constructor(override val value: UShort) : PacketId
     override fun toString(): String = "IgnoredPacketId(${value.toUHexString()})"
 }
 
-class KnownPacketId(override val value: UShort, override val factory: PacketFactory<*, *>) : PacketId {
+class KnownPacketId(override val value: UShort, override val factory: PacketFactory<*, *>) :
+    PacketId {
     companion object : MutableMap<UShort, KnownPacketId> by mutableMapOf() {
         operator fun set(key: UShort, factory: PacketFactory<*, *>) {
             this[key] = KnownPacketId(key, factory)
@@ -65,7 +68,8 @@ class KnownPacketId(override val value: UShort, override val factory: PacketFact
             return null
         }
 
-        inline fun <reified PF : PacketFactory<*, *>> get(): KnownPacketId = getOrNull<PF>() ?: throw NoSuchElementException()
+        inline fun <reified PF : PacketFactory<*, *>> get(): KnownPacketId = getOrNull<PF>()
+            ?: throw NoSuchElementException()
     }
 
     override fun toString(): String = (factory::class.simpleName ?: factory::class.simpleName) + "(${value.toUHexString()})"
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/SessionKey.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/SessionKey.kt
new file mode 100644
index 000000000..f4ab26b43
--- /dev/null
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/SessionKey.kt
@@ -0,0 +1,11 @@
+package net.mamoe.mirai.timpc.network.packet
+
+import net.mamoe.mirai.utils.cryptor.DecrypterByteArray
+import net.mamoe.mirai.utils.cryptor.DecrypterType
+
+/**
+ * 会话密匙
+ */
+inline class SessionKey(override val value: ByteArray) : DecrypterByteArray {
+    companion object Type : DecrypterType<SessionKey>
+}
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/AddContact.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/AddContact.kt
index 55d34a919..7c2052dce 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/AddContact.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/AddContact.kt
@@ -8,9 +8,10 @@ import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.EventPacket
 import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.data.PreviousNameList
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.PacketVersion
+
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.utils.io.*
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendImage.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendImage.kt
index 3d718c674..4e538b886 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendImage.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendImage.kt
@@ -10,10 +10,10 @@ import net.mamoe.mirai.message.data.ImageId
 import net.mamoe.mirai.message.data.ImageId0x06
 import net.mamoe.mirai.message.data.requireLength
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.utils.ExternalImage
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.*
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendList.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendList.kt
index 2079b68a4..cd67ecbc1 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendList.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/FriendList.kt
@@ -5,8 +5,9 @@ package net.mamoe.mirai.timpc.network.packet.action
 import kotlinx.io.core.ByteReadPacket
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.PacketId
-import net.mamoe.mirai.network.packet.SessionPacketFactory
+import net.mamoe.mirai.timpc.network.packet.PacketId
+
+import net.mamoe.mirai.timpc.network.packet.SessionPacketFactory
 
 
 // 0001
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GradeInfo.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GradeInfo.kt
index 25bdb947d..db5ee3f8c 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GradeInfo.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GradeInfo.kt
@@ -7,9 +7,11 @@ import kotlinx.io.core.writeFully
 import kotlinx.io.core.writeUByte
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.NoLog
+
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.cryptor.encryptAndWrite
 import net.mamoe.mirai.utils.io.writeQQ
 
 /**
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupImage.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupImage.kt
index 0d4b2b844..3bcce8cc2 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupImage.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupImage.kt
@@ -11,8 +11,9 @@ import net.mamoe.mirai.message.data.requireLength
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.EventPacket
 import net.mamoe.mirai.data.ImageLink
-import net.mamoe.mirai.network.packet.*
-import net.mamoe.mirai.timpc.network.packet.buildSessionProtoPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.PacketVersion
+
 import net.mamoe.mirai.timpc.utils.assertUnreachable
 import net.mamoe.mirai.utils.ExternalImage
 import net.mamoe.mirai.utils.io.toUHexString
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupPacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupPacket.kt
index 62f369ed2..e717aa12d 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupPacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/GroupPacket.kt
@@ -10,12 +10,13 @@ import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.message.data.MessageChain
 import net.mamoe.mirai.message.internal.toPacket
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.internal.RawGroupInfo
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.timpc.utils.unsupportedFlag
 import net.mamoe.mirai.timpc.utils.unsupportedType
+import net.mamoe.mirai.utils.NoLog
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.*
 import kotlin.collections.set
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Profile.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Profile.kt
index 5d0cf04bb..f9e980127 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Profile.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Profile.kt
@@ -8,8 +8,9 @@ import net.mamoe.mirai.data.Gender
 import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.data.Profile
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.PacketVersion
+
 import net.mamoe.mirai.utils.io.*
 
 inline class AvatarLink(val value: String) : Packet
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Remark.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Remark.kt
index de6dd7178..a591d1549 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Remark.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/Remark.kt
@@ -6,8 +6,9 @@ import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.FriendNameRemark
-import net.mamoe.mirai.network.packet.*
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.PacketVersion
+
 import net.mamoe.mirai.utils.io.readUShortLVString
 import net.mamoe.mirai.utils.io.writeQQ
 import net.mamoe.mirai.utils.io.writeZero
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/RequestFriendListPacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/RequestFriendListPacket.kt
index 0183ba262..2e36224a3 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/RequestFriendListPacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/RequestFriendListPacket.kt
@@ -3,11 +3,11 @@
 package net.mamoe.mirai.timpc.network.packet.action
 
 import kotlinx.io.core.ByteReadPacket
-import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.writeZero
 
 class FriendList : Packet
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/SendFriendMessagePacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/SendFriendMessagePacket.kt
index 98c4220e9..81ce639ef 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/SendFriendMessagePacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/action/SendFriendMessagePacket.kt
@@ -7,9 +7,11 @@ import net.mamoe.mirai.message.data.MessageChain
 import net.mamoe.mirai.message.internal.toPacket
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.NoLog
+import net.mamoe.mirai.utils.PacketVersion
+
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.utils.io.*
 import net.mamoe.mirai.utils.md5
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/AndroidOnlineStatusChange.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/AndroidOnlineStatusChange.kt
index 73e21fc24..c40dc9aef 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/AndroidOnlineStatusChange.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/AndroidOnlineStatusChange.kt
@@ -6,7 +6,7 @@ import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.readBoolean
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/EventPacketFactory.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/EventPacketFactory.kt
index 5f958ee87..22a287afa 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/EventPacketFactory.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/EventPacketFactory.kt
@@ -6,10 +6,10 @@ import kotlinx.io.core.*
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.NoLog
 import net.mamoe.mirai.timpc.network.TIMPCBotNetworkHandler
 import net.mamoe.mirai.qqAccount
-import net.mamoe.mirai.timpc.network.packet.buildSessionPacket
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.utils.io.readIoBuffer
 
 /**
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendAddRequestEventPacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendAddRequestEventPacket.kt
index 886abab5a..25144fd80 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendAddRequestEventPacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendAddRequestEventPacket.kt
@@ -6,7 +6,7 @@ import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.event.events.ReceiveFriendAddRequestEvent
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.readQQ
 import net.mamoe.mirai.utils.io.readUShortLVString
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendConversationIniliaze.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendConversationIniliaze.kt
index 87b46ff5c..fb3e77a80 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendConversationIniliaze.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendConversationIniliaze.kt
@@ -6,7 +6,7 @@ import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.data.EventPacket
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.readQQ
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendOnlineStatusChanged.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendOnlineStatusChanged.kt
index f4c162898..587d93899 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendOnlineStatusChanged.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/FriendOnlineStatusChanged.kt
@@ -5,11 +5,12 @@ package net.mamoe.mirai.timpc.network.packet.event
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import kotlinx.io.core.readUByte
+import net.mamoe.mirai.data.OnlineStatus
 import net.mamoe.mirai.event.events.FriendStatusChanged
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.PacketId
-import net.mamoe.mirai.network.packet.SessionPacketFactory
-import net.mamoe.mirai.utils.OnlineStatus
+import net.mamoe.mirai.timpc.network.packet.PacketId
+
+import net.mamoe.mirai.timpc.network.packet.SessionPacketFactory
 import net.mamoe.mirai.utils.io.readQQ
 
 /**
@@ -21,7 +22,8 @@ internal object FriendOnlineStatusChangedPacket : SessionPacketFactory<FriendSta
         val qq = readQQ()
         discardExact(8)
         val statusId = readUByte()
-        val status = OnlineStatus(statusId)
+
+        val status = OnlineStatus.ofId(statusId.toInt())
         return FriendStatusChanged(handler.bot.getQQ(qq), status)
     }
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/GroupFileUpload.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/GroupFileUpload.kt
index ad45caf15..7a6e23a62 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/GroupFileUpload.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/GroupFileUpload.kt
@@ -5,7 +5,7 @@ package net.mamoe.mirai.timpc.network.packet.event
 import kotlinx.io.core.ByteReadPacket
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.data.EventPacket
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.debugPrint
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MemberPermission.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MemberPermission.kt
index 7149ddef4..09dfd86b8 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MemberPermission.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MemberPermission.kt
@@ -8,7 +8,7 @@ import net.mamoe.mirai.Bot
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member
 import net.mamoe.mirai.data.EventPacket
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.io.readQQ
 
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MessageEvent.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MessageEvent.kt
index 1ba1f2a83..f8eb5ffb2 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MessageEvent.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/event/MessageEvent.kt
@@ -7,7 +7,7 @@ import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.message.GroupMessage
 import net.mamoe.mirai.message.internal.readMessageChain
 import net.mamoe.mirai.message.FriendMessage
-import net.mamoe.mirai.network.packet.PacketVersion
+import net.mamoe.mirai.utils.PacketVersion
 import net.mamoe.mirai.utils.MiraiLogger
 import net.mamoe.mirai.utils.io.*
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Captcha.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Captcha.kt
index f0236e8e6..dddc26dc2 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Captcha.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Captcha.kt
@@ -5,9 +5,13 @@ package net.mamoe.mirai.timpc.network.packet.login
 import kotlinx.io.core.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.network.TIMProtocol
+import net.mamoe.mirai.timpc.network.packet.OutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.PacketFactory
+import net.mamoe.mirai.timpc.network.packet.PacketId
 import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
+import net.mamoe.mirai.utils.cryptor.DecrypterByteArray
+import net.mamoe.mirai.utils.cryptor.DecrypterType
 import net.mamoe.mirai.utils.io.*
 
 internal object CaptchaKey : DecrypterByteArray,
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/ChangeOnlineStatusPacket.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/ChangeOnlineStatusPacket.kt
index 1a4ea0f8f..f6265d914 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/ChangeOnlineStatusPacket.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/ChangeOnlineStatusPacket.kt
@@ -5,21 +5,20 @@ package net.mamoe.mirai.timpc.network.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.data.OnlineStatus
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
-import net.mamoe.mirai.utils.OnlineStatus
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.cryptor.NoDecrypter
+import net.mamoe.mirai.utils.cryptor.encryptAndWrite
 import net.mamoe.mirai.utils.io.writeHex
 import net.mamoe.mirai.utils.io.writeQQ
 
 /**
  * 改变在线状态: "我在线上", "隐身" 等
  */
-internal object ChangeOnlineStatusPacket : PacketFactory<ChangeOnlineStatusPacket.ChangeOnlineStatusResponse, NoDecrypter>(
-    NoDecrypter
-) {
+internal object ChangeOnlineStatusPacket : PacketFactory<ChangeOnlineStatusPacket.ChangeOnlineStatusResponse, NoDecrypter>(NoDecrypter) {
     operator fun invoke(
         bot: Long,
         sessionKey: SessionKey,
@@ -29,7 +28,7 @@ internal object ChangeOnlineStatusPacket : PacketFactory<ChangeOnlineStatusPacke
         writeFully(TIMProtocol.fixVer2)
         encryptAndWrite(sessionKey) {
             writeHex("01 00")
-            writeUByte(loginStatus.id)
+            writeUByte(loginStatus.id.toUByte())
             writeHex("00 01 00 01 00 04 00 00 00 00")
         }
     }
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Heartbeat.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Heartbeat.kt
index 3fe10c33b..894d3368e 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Heartbeat.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Heartbeat.kt
@@ -7,9 +7,11 @@ import kotlinx.io.core.writeFully
 import net.mamoe.mirai.event.Subscribable
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.NoLog
+
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.cryptor.encryptAndWrite
 import net.mamoe.mirai.utils.io.writeHex
 import net.mamoe.mirai.utils.io.writeQQ
 
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/PasswordSubmission.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/PasswordSubmission.kt
index 27d0d1fea..ab88aec5f 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/PasswordSubmission.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/PasswordSubmission.kt
@@ -7,10 +7,13 @@ import net.mamoe.mirai.data.Gender
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.LoginResult
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.network.TIMProtocol
+import net.mamoe.mirai.timpc.network.packet.OutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.PacketFactory
+import net.mamoe.mirai.timpc.network.packet.PacketId
 import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
 import net.mamoe.mirai.utils.*
+import net.mamoe.mirai.utils.cryptor.*
 import net.mamoe.mirai.utils.io.*
 
 internal object ShareKey : DecrypterByteArray,
@@ -366,4 +369,9 @@ private fun BytePacketBuilder.writePart2() {
     this.writeCRC32()
 }
 
+internal fun BytePacketBuilder.writeCRC32() = writeCRC32(getRandomByteArray(16))
 
+internal fun BytePacketBuilder.writeCRC32(key: ByteArray) {
+    writeFully(key)//key
+    writeInt(crc32(key))
+}
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/SKey.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/SKey.kt
index 9a218da4c..28a2b7179 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/SKey.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/SKey.kt
@@ -7,9 +7,9 @@ import kotlinx.io.core.discardExact
 import kotlinx.io.core.writeFully
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.network.TIMProtocol
-import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.*
+import net.mamoe.mirai.utils.cryptor.encryptAndWrite
 import net.mamoe.mirai.utils.io.*
 
 internal inline class SKey(
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Session.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Session.kt
index 8f9c9c1d8..fec7d6c1c 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Session.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Session.kt
@@ -5,10 +5,10 @@ package net.mamoe.mirai.timpc.network.packet.login
 import kotlinx.io.core.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.data.Packet
-import net.mamoe.mirai.network.packet.PacketFactory
-import net.mamoe.mirai.network.packet.PacketId
-import net.mamoe.mirai.network.packet.SessionKey
 import net.mamoe.mirai.timpc.network.TIMProtocol
+import net.mamoe.mirai.timpc.network.packet.PacketFactory
+import net.mamoe.mirai.timpc.network.packet.PacketId
+import net.mamoe.mirai.timpc.network.packet.SessionKey
 import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
 import net.mamoe.mirai.utils.io.*
 import net.mamoe.mirai.utils.localIpAddress
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Touch.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Touch.kt
index 48407f6a0..a297348f4 100644
--- a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Touch.kt
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/packet/login/Touch.kt
@@ -8,9 +8,13 @@ import kotlinx.io.core.readBytes
 import kotlinx.io.core.writeFully
 import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
 import net.mamoe.mirai.timpc.network.TIMProtocol
+import net.mamoe.mirai.timpc.network.packet.OutgoingPacket
+import net.mamoe.mirai.timpc.network.packet.PacketFactory
+import net.mamoe.mirai.timpc.network.packet.PacketId
 import net.mamoe.mirai.timpc.network.packet.buildOutgoingPacket
+import net.mamoe.mirai.utils.cryptor.DecrypterByteArray
+import net.mamoe.mirai.utils.cryptor.DecrypterType
 import net.mamoe.mirai.utils.io.*
 
 internal object TouchKey : DecrypterByteArray,
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/getGTK.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/getGTK.kt
new file mode 100644
index 000000000..b03c52110
--- /dev/null
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/getGTK.kt
@@ -0,0 +1,15 @@
+package net.mamoe.mirai.timpc.utils
+
+import kotlinx.io.core.toByteArray
+
+private const val GTK_BASE_VALUE: Int = 5381
+
+fun getGTK(sKey: String): Int {
+    var value = GTK_BASE_VALUE
+    for (c in sKey.toByteArray()) {
+        value += (value shl 5) + c.toInt()
+    }
+
+    value = value and Int.MAX_VALUE
+    return value
+}
diff --git a/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/writeProto.kt b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/writeProto.kt
new file mode 100644
index 000000000..fa67ffd0f
--- /dev/null
+++ b/mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/utils/writeProto.kt
@@ -0,0 +1,8 @@
+package net.mamoe.mirai.timpc.utils
+
+import kotlinx.io.core.BytePacketBuilder
+import kotlinx.io.core.writeFully
+import kotlinx.serialization.SerializationStrategy
+import kotlinx.serialization.protobuf.ProtoBuf
+
+fun <T> BytePacketBuilder.writeProto(serializer: SerializationStrategy<T>, obj: T) = writeFully(ProtoBuf.dump(serializer, obj))
diff --git a/mirai-core-timpc/src/jvmTest/kotlin/PacketDebugger.kt b/mirai-core-timpc/src/jvmTest/kotlin/PacketDebugger.kt
index 51ec13712..fddfd3318 100644
--- a/mirai-core-timpc/src/jvmTest/kotlin/PacketDebugger.kt
+++ b/mirai-core-timpc/src/jvmTest/kotlin/PacketDebugger.kt
@@ -16,14 +16,17 @@ import kotlinx.serialization.internal.ArrayListSerializer
 import kotlinx.serialization.json.Json
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.network.BotNetworkHandler
-import net.mamoe.mirai.network.packet.*
+
 import net.mamoe.mirai.timpc.TIMPC
 import net.mamoe.mirai.timpc.network.TIMProtocol
+import net.mamoe.mirai.timpc.network.packet.*
 import net.mamoe.mirai.timpc.network.packet.event.FriendOnlineStatusChangedPacket
 import net.mamoe.mirai.timpc.network.packet.event.IgnoredEventPacket
 import net.mamoe.mirai.timpc.network.packet.login.*
-import net.mamoe.mirai.utils.DecryptionFailedException
-import net.mamoe.mirai.utils.decryptBy
+import net.mamoe.mirai.utils.cryptor.Decrypter
+import net.mamoe.mirai.utils.cryptor.DecryptionFailedException
+import net.mamoe.mirai.utils.cryptor.NoDecrypter
+import net.mamoe.mirai.utils.cryptor.decryptBy
 import net.mamoe.mirai.utils.io.*
 import org.pcap4j.core.BpfProgram.BpfCompileMode
 import org.pcap4j.core.PacketListener
@@ -181,13 +184,13 @@ internal object PacketDebugger {
      * 8. 查看内存, `eax` 到 `eax+10` 的 16 字节就是 `sessionKey`
      */
     val sessionKey: SessionKey =
-        SessionKey("95 F3 24 8E 7B B6 62 AA 98 C0 EE 45 CE CE 2B 69".hexToBytes())
+        SessionKey("D8 D0 B0 DE 37 53 9B 05 A5 E7 AB 96 B2 AC AD EC".hexToBytes())
     // TODO: 2019/12/7 无法访问 internal 是 kotlin bug, KT-34849
 
     /**
      * null 则不筛选
      */
-    val qq: Long? = 761025446
+    val qq: Long? = null
     /**
      * 打开后则记录每一个包到文件.
      */
@@ -204,7 +207,7 @@ internal object PacketDebugger {
         //println("raw = " + data.toUHexString())
         data.read {
             discardExact(3)
-            val id = net.mamoe.mirai.network.packet.matchPacketId(readUShort())
+            val id = matchPacketId(readUShort())
             val sequenceId = readUShort()
             val packetQQ = readQQ()
             if (id == KnownPacketId.get<HeartbeatPacket>() || (qq != null && packetQQ != qq))
@@ -301,7 +304,7 @@ internal object PacketDebugger {
         // 3E 03 3F A2 02 00 00 00 01 2E 01 00 00 69 35
 
         discardExact(3)//head
-        val id = net.mamoe.mirai.network.packet.matchPacketId(readUShort())
+        val id = net.mamoe.mirai.timpc.network.packet.matchPacketId(readUShort())
         val sequence = readUShort().toUHexString()
         if (IgnoredPacketIdList.contains(id)) {
             return
diff --git a/mirai-core-timpc/src/jvmTest/kotlin/packetdebugger/PacketDecoder.kt b/mirai-core-timpc/src/jvmTest/kotlin/packetdebugger/PacketDecoder.kt
index c65e401eb..92e7ec885 100644
--- a/mirai-core-timpc/src/jvmTest/kotlin/packetdebugger/PacketDecoder.kt
+++ b/mirai-core-timpc/src/jvmTest/kotlin/packetdebugger/PacketDecoder.kt
@@ -3,8 +3,9 @@ package packetdebugger
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.discardExact
 import kotlinx.io.core.readUShort
-import net.mamoe.mirai.network.packet.PacketId
-import net.mamoe.mirai.network.packet.matchPacketId
+import net.mamoe.mirai.timpc.network.packet.PacketId
+
+import net.mamoe.mirai.timpc.network.packet.matchPacketId
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotFactory.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotFactory.kt
index 8e200c5fe..0fc6e9f15 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotFactory.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotFactory.kt
@@ -3,7 +3,7 @@
 package net.mamoe.mirai
 
 import kotlinx.coroutines.CoroutineScope
-import net.mamoe.mirai.network.packet.NullPacketId.factory
+
 import net.mamoe.mirai.utils.BotConfiguration
 import net.mamoe.mirai.utils.MiraiLogger
 import kotlin.coroutines.CoroutineContext
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
index 2f6f80eb6..96ed916fc 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
@@ -4,7 +4,7 @@ package net.mamoe.mirai.contact
 
 import kotlinx.coroutines.CoroutineScope
 import net.mamoe.mirai.data.GroupInfo
-import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
+import net.mamoe.mirai.utils.coerceAtLeastOrFail
 
 
 /**
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/data/OnlineStatus.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/data/OnlineStatus.kt
new file mode 100644
index 000000000..4ba89683b
--- /dev/null
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/data/OnlineStatus.kt
@@ -0,0 +1,44 @@
+package net.mamoe.mirai.data
+
+/**
+ * 在线状态
+ */
+enum class OnlineStatus(val id: Int) {
+    /**
+     * 我在线上
+     */
+    ONLINE(11), // 0x0A
+    /**
+     * 离线
+     */
+    OFFLINE(21), // 0x02
+    /**
+     * 离开
+     */
+    AWAY(31),
+    /**
+     * 隐身
+     */
+    INVISIABLE(41),
+    /**
+     * 忙碌
+     */
+    BUSY(50), // 0x32
+    /**
+     * Q 我吧
+     */
+    Q_ME(60),
+    /**
+     * 请勿打扰
+     */
+    DND(70),
+    /**
+     * 离线但接收消息
+     */
+    RECEIVE_OFFLINE_MESSAGE(95);
+
+    companion object {
+        fun ofId(id: Int): OnlineStatus = values().first { it.id == id }
+        fun ofIdOrNull(id: Int): OnlineStatus? = values().firstOrNull { it.id == id }
+    }
+}
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/FriendStatusChanged.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/FriendStatusChanged.kt
index b889aca96..1d5fc15ef 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/FriendStatusChanged.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/FriendStatusChanged.kt
@@ -2,7 +2,7 @@ package net.mamoe.mirai.event.events
 
 import net.mamoe.mirai.contact.QQ
 import net.mamoe.mirai.data.EventPacket
-import net.mamoe.mirai.utils.OnlineStatus
+import net.mamoe.mirai.data.OnlineStatus
 
 data class FriendStatusChanged(
     val qq: QQ,
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
index 9353d58b3..0387bb327 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
@@ -10,7 +10,7 @@ import net.mamoe.mirai.data.ImageLink
 import net.mamoe.mirai.event.events.BotEvent
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.utils.*
-import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
+import net.mamoe.mirai.utils.coerceAtLeastOrFail
 import kotlin.jvm.JvmName
 
 /**
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Annotations.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Annotations.kt
deleted file mode 100644
index 6b0dba502..000000000
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Annotations.kt
+++ /dev/null
@@ -1,18 +0,0 @@
-@file:Suppress("EXPERIMENTAL_API_USAGE", "unused")
-
-package net.mamoe.mirai.network.packet
-
-/**
- * 包的最后一次修改时间, 和分析时使用的 TIM 版本
- */
-@MustBeDocumented
-@Target(AnnotationTarget.FUNCTION, AnnotationTarget.CLASS, AnnotationTarget.PROPERTY)
-@Retention(AnnotationRetention.SOURCE)
-annotation class PacketVersion(val date: String, val timVersion: String)
-
-/**
- * 带有这个注解的 [Packet] 将不会被记录在 log 中.
- */
-@Target(AnnotationTarget.CLASS)
-@Retention(AnnotationRetention.RUNTIME)
-annotation class NoLog
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Annotations.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Annotations.kt
index cc5473379..20bdce50f 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Annotations.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Annotations.kt
@@ -36,3 +36,18 @@ annotation class MiraiExperimentalAPI(
 @Retention(AnnotationRetention.BINARY)
 @MustBeDocumented
 annotation class SinceMirai(val version: String)
+
+/**
+ * 包的最后一次修改时间, 和分析时使用的 TIM 版本
+ */
+@MustBeDocumented
+@Target(AnnotationTarget.FUNCTION, AnnotationTarget.CLASS, AnnotationTarget.PROPERTY)
+@Retention(AnnotationRetention.SOURCE)
+annotation class PacketVersion(val date: String, val timVersion: String)
+
+/**
+ * 带有这个注解的 [Packet] 将不会被记录在 log 中.
+ */
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class NoLog
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Calculation.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Calculation.kt
index e56c96a57..13f67f445 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Calculation.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Calculation.kt
@@ -5,24 +5,4 @@ import kotlinx.io.core.toByteArray
 import kotlinx.io.core.writeFully
 import net.mamoe.mirai.utils.io.getRandomByteArray
 
-private const val GTK_BASE_VALUE: Int = 5381
-
-fun getGTK(sKey: String): Int {
-    var value = GTK_BASE_VALUE
-    for (c in sKey.toByteArray()) {
-        value += (value shl 5) + c.toInt()
-    }
-
-    value = value and Int.MAX_VALUE
-    return value
-}
-
-@Tested
-fun BytePacketBuilder.writeCRC32() = writeCRC32(getRandomByteArray(16))
-
-fun BytePacketBuilder.writeCRC32(key: ByteArray) {
-    writeFully(key)//key
-    writeInt(crc32(key))
-}
-
 fun md5(str: String): ByteArray = md5(str.toByteArray())
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/NumberUtils.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/NumberUtils.kt
similarity index 95%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/NumberUtils.kt
rename to mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/NumberUtils.kt
index e75b91998..1db24b31f 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/NumberUtils.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/NumberUtils.kt
@@ -1,4 +1,4 @@
-package net.mamoe.mirai.utils.internal
+package net.mamoe.mirai.utils
 
 /**
  * 要求 [this] 最小为 [min].
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/OnlineStatus.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/OnlineStatus.kt
deleted file mode 100644
index 65e421819..000000000
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/OnlineStatus.kt
+++ /dev/null
@@ -1,52 +0,0 @@
-@file:Suppress("EXPERIMENTAL_UNSIGNED_LITERALS", "EXPERIMENTAL_API_USAGE", "unused")
-
-package net.mamoe.mirai.utils
-
-import kotlin.jvm.JvmStatic
-
-/**
- * QQ 在线状态
- *
- * @author Him188moe
- * @see net.mamoe.mirai.timpc.network.packet.login.ChangeOnlineStatusPacket
- */
-inline class OnlineStatus(
-    inline val id: UByte
-) {
-    companion object {
-        /**
-         * 我在线上
-         */
-        @JvmStatic
-        val ONLINE = OnlineStatus(0x0Au)
-
-        /**
-         * 忙碌
-         */
-        @JvmStatic
-        val BUSY = OnlineStatus(0x32u)
-
-        /**
-         * 离线 ? 也可能是被删好友 TODO confirm that
-         */
-        @JvmStatic
-        val OFFLINE = OnlineStatus(0x02u)
-
-        @JvmStatic
-        val UNKNOWN1 = OnlineStatus(0x20u)
-        @JvmStatic
-        val UNKNOWN2 = OnlineStatus(0x46u)
-        @JvmStatic
-        val UNKNOWN3 = OnlineStatus(0x14u)
-        @JvmStatic
-        val UNKNOWN4 = OnlineStatus(0xC9u)
-        @JvmStatic
-        val UNKNOWN5 = OnlineStatus(0x1Eu)
-    }
-
-    // TODO: 2019/10/29  what is 0x20u
-    // TODO: 2019/11/11  what is 0x46u
-    // TODO: 2019/11/11  what is 0x14u
-    // TODO: 2019/11/11 0xC9u
-    // TODO: 2019/11/11 0x1Eu
-}
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Decrypters.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Decrypters.kt
similarity index 85%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Decrypters.kt
rename to mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Decrypters.kt
index bc8eb89ab..f7e6bcb4f 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/packet/Decrypters.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Decrypters.kt
@@ -1,19 +1,11 @@
-package net.mamoe.mirai.network.packet
+package net.mamoe.mirai.utils.cryptor
 
 import kotlinx.io.core.BytePacketBuilder
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.IoBuffer
-import net.mamoe.mirai.utils.decryptBy
 import net.mamoe.mirai.utils.io.encryptAndWrite
 
 
-/**
- * 会话密匙
- */
-inline class SessionKey(override val value: ByteArray) : DecrypterByteArray {
-    companion object Type : DecrypterType<SessionKey>
-}
-
 /**
  * [ByteArray] 解密器
  */
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Proto.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Proto.kt
similarity index 94%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Proto.kt
rename to mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Proto.kt
index 6df1a8bd1..bff3e23bf 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/Proto.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/Proto.kt
@@ -1,6 +1,6 @@
 @file:Suppress("EXPERIMENTAL_API_USAGE", "unused")
 
-package net.mamoe.mirai.utils
+package net.mamoe.mirai.utils.cryptor
 
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.readBytes
@@ -24,7 +24,11 @@ import kotlin.jvm.JvmStatic
  *
  * https://www.jianshu.com/p/f888907adaeb
  */
-fun ProtoFieldId(serializedId: UInt): ProtoFieldId = ProtoFieldId(protoFieldNumber(serializedId), protoType(serializedId))
+fun ProtoFieldId(serializedId: UInt): ProtoFieldId =
+    ProtoFieldId(
+        protoFieldNumber(serializedId),
+        protoType(serializedId)
+    )
 
 data class ProtoFieldId(
     val fieldNumber: Int,
@@ -78,7 +82,8 @@ enum class ProtoType(val value: Byte, private val typeName: String) {
  *
  * serializedId = (fieldNumber << 3) | wireType
  */
-fun protoType(number: UInt): ProtoType = ProtoType.valueOf(number.toInt().shl(29).ushr(29).toByte())
+fun protoType(number: UInt): ProtoType =
+    ProtoType.valueOf(number.toInt().shl(29).ushr(29).toByte())
 
 /**
  * ProtoBuf 序列化后的 id 转为序列前标记的 id
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TEA.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/TEA.kt
similarity index 97%
rename from mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TEA.kt
rename to mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/TEA.kt
index 54b808afd..dba788b6e 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/TEA.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/cryptor/TEA.kt
@@ -1,4 +1,4 @@
-package net.mamoe.mirai.utils
+package net.mamoe.mirai.utils.cryptor
 
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.io.core.IoBuffer
@@ -29,7 +29,8 @@ class DecryptionFailedException : Exception {
  * @param key 长度至少为 16
  * @throws DecryptionFailedException 解密错误时
  */
-fun ByteArray.encryptBy(key: ByteArray, length: Int = this.size): ByteArray = TEA.encrypt(this, key, sourceLength = length)
+fun ByteArray.encryptBy(key: ByteArray, length: Int = this.size): ByteArray =
+    TEA.encrypt(this, key, sourceLength = length)
 
 /**
  * 在 [ByteArrayPool] 缓存 [this], 然后使用 [key] 加密.
@@ -339,11 +340,13 @@ private object TEA {
 
     @PublishedApi
     @JvmStatic
-    internal fun encrypt(source: ByteArray, key: ByteArray, sourceLength: Int = source.size): ByteArray = doOption(source, key, sourceLength, true)
+    internal fun encrypt(source: ByteArray, key: ByteArray, sourceLength: Int = source.size): ByteArray =
+        doOption(source, key, sourceLength, true)
 
     @PublishedApi
     @JvmStatic
-    internal fun decrypt(source: ByteArray, key: ByteArray, sourceLength: Int = source.size): ByteArray = doOption(source, key, sourceLength, false)
+    internal fun decrypt(source: ByteArray, key: ByteArray, sourceLength: Int = source.size): ByteArray =
+        doOption(source, key, sourceLength, false)
 
     private fun ByteArray.pack(offset: Int, len: Int): Long {
         var result: Long = 0
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/InlinedRemoveIf.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/InlinedRemoveIf.kt
deleted file mode 100644
index 32ecd0223..000000000
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/InlinedRemoveIf.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-@file:JvmName("IterableUtil")
-
-package net.mamoe.mirai.utils.internal
-
-import kotlin.jvm.JvmName
-
-internal inline fun <T> MutableIterable<T>.inlinedRemoveIf(predicate: (T) -> Boolean) = iterator().inlinedRemoveIf(predicate)
-
-internal inline fun <T> MutableIterator<T>.inlinedRemoveIf(predicate: (T) -> Boolean) {
-    while (this.hasNext()) {
-        if (predicate(this.next())) {
-            this.remove()
-        }
-    }
-}
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/OutputUtils.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/OutputUtils.kt
index b5186aef2..ee1049c08 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/OutputUtils.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/OutputUtils.kt
@@ -4,15 +4,13 @@ package net.mamoe.mirai.utils.io
 
 import kotlinx.io.core.*
 import kotlinx.io.pool.useInstance
-import kotlinx.serialization.SerializationStrategy
-import kotlinx.serialization.protobuf.ProtoBuf
 import net.mamoe.mirai.contact.GroupId
 import net.mamoe.mirai.contact.GroupInternalId
 import net.mamoe.mirai.utils.Tested
+import net.mamoe.mirai.utils.coerceAtMostOrFail
+import net.mamoe.mirai.utils.cryptor.encryptBy
 import net.mamoe.mirai.utils.currentTime
 import net.mamoe.mirai.utils.deviceName
-import net.mamoe.mirai.utils.encryptBy
-import net.mamoe.mirai.utils.internal.coerceAtMostOrFail
 import kotlin.random.Random
 import kotlin.random.nextInt
 
@@ -28,6 +26,18 @@ fun BytePacketBuilder.writeQQ(qq: Long) = this.writeUInt(qq.toUInt()) // same bi
 fun BytePacketBuilder.writeGroup(groupId: GroupId) = this.writeUInt(groupId.value.toUInt())
 fun BytePacketBuilder.writeGroup(groupInternalId: GroupInternalId) = this.writeUInt(groupInternalId.value.toUInt())
 
+fun BytePacketBuilder.writeShortLVByteArrayLimitedLength(array: ByteArray, maxLength: Int) {
+    if (array.size <= maxLength) {
+        writeShort(array.size.toShort())
+        writeFully(array)
+    } else {
+        writeShort(maxLength.toShort())
+        repeat(maxLength) {
+            writeByte(array[it])
+        }
+    }
+}
+
 fun BytePacketBuilder.writeShortLVByteArray(byteArray: ByteArray) {
     this.writeShort(byteArray.size.toShort())
     this.writeFully(byteArray)
@@ -63,8 +73,6 @@ fun BytePacketBuilder.writeHex(uHex: String) {
     }
 }
 
-fun <T> BytePacketBuilder.writeProto(serializer: SerializationStrategy<T>, obj: T) = writeFully(ProtoBuf.dump(serializer, obj))
-
 
 fun BytePacketBuilder.writeTLV(tag: UByte, values: UByteArray) {
     writeUByte(tag)
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
index 659e326cf..7d0c10f57 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
@@ -92,6 +92,12 @@ fun String.hexToBytes(): ByteArray =
         .map { s -> s.toUByte(16).toByte() }
         .toByteArray()
 
+/**
+ * 每 2 char 为一组, 转换 Hex 为 [ByteArray]
+ */
+fun String.chunkedHexToBytes(): ByteArray =
+    this.chunked(2).map { it.toUByte(16).toByte() }.toByteArray()
+
 /**
  * 将无符号 Hex 转为 [UByteArray], 有根据 hex 的 [hashCode] 建立的缓存.
  */
diff --git a/mirai-core/src/jvmTest/kotlin/mirai/test/testCaptchaPacket/TestCaptchaPacket.kt b/mirai-core/src/jvmTest/kotlin/mirai/test/testCaptchaPacket/TestCaptchaPacket.kt
index b0ef6122f..52c712fa2 100644
--- a/mirai-core/src/jvmTest/kotlin/mirai/test/testCaptchaPacket/TestCaptchaPacket.kt
+++ b/mirai-core/src/jvmTest/kotlin/mirai/test/testCaptchaPacket/TestCaptchaPacket.kt
@@ -1,6 +1,6 @@
 package mirai.test.testCaptchaPacket
 
-import net.mamoe.mirai.utils.decryptBy
+import net.mamoe.mirai.utils.cryptor.decryptBy
 import net.mamoe.mirai.utils.io.hexToBytes
 import net.mamoe.mirai.utils.io.toUHexString
 
diff --git a/mirai-debug/build.gradle.kts b/mirai-debug/build.gradle.kts
index 2ccfe8a02..3f8bebf1f 100644
--- a/mirai-debug/build.gradle.kts
+++ b/mirai-debug/build.gradle.kts
@@ -41,7 +41,7 @@ fun ktor(id: String, version: String) = "io.ktor:ktor-$id:$version"
 
 dependencies {
 
-    implementation(files("../mirai-core-timpc/build/classes/kotlin/jvm/main")) // IDE bug
+    runtimeOnly(files("../mirai-core-timpc/build/classes/kotlin/jvm/main")) // IDE bug
     implementation(project(":mirai-core-timpc"))
     // runtimeOnly(files("../mirai-core/build/classes/kotlin/jvm/main")) // classpath is not added correctly by IDE
 
diff --git a/mirai-debug/src/main/kotlin/test/ProtoTest.kt b/mirai-debug/src/main/kotlin/test/ProtoTest.kt
index 4324c2aad..6b81f94ff 100644
--- a/mirai-debug/src/main/kotlin/test/ProtoTest.kt
+++ b/mirai-debug/src/main/kotlin/test/ProtoTest.kt
@@ -7,10 +7,10 @@ import kotlinx.serialization.protobuf.ProtoBuf
 import kotlinx.serialization.protobuf.ProtoNumberType
 import kotlinx.serialization.protobuf.ProtoType
 import net.mamoe.mirai.utils.MiraiInternalAPI
+import net.mamoe.mirai.utils.cryptor.readProtoMap
 import net.mamoe.mirai.utils.io.hexToBytes
 import net.mamoe.mirai.utils.io.read
 import net.mamoe.mirai.utils.io.toUHexString
-import net.mamoe.mirai.utils.readProtoMap
 import kotlin.reflect.KClass
 
 @Serializable