diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
index bdac9842a..df590c0cb 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
@@ -39,7 +39,7 @@ abstract class ClientPacket : ByteArrayDataOutputStream(), Packet {
      *
      *
      * Before sending the packet, an [tail][Protocol.tail] will be added.
-     */// TODO: 2019/8/9 添加 tail
+     */
     @Throws(IOException::class)
     abstract fun encode()
 
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
index 32eb204d0..a4284dda5 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
@@ -2,6 +2,7 @@ package net.mamoe.mirai.network.packet.server
 
 import net.mamoe.mirai.network.Protocol
 import net.mamoe.mirai.util.TEACryptor
+import net.mamoe.mirai.util.getRandomKey
 import java.io.DataInputStream
 
 /**
@@ -22,6 +23,7 @@ class Server0825Packet(private val type: Type, inputStream: DataInputStream) : S
         TYPE_08_25_31_02,
     }
 
+    @ExperimentalUnsignedTypes
     override fun decode() {
         input.skip(43 - 11)//todo: check
         val data = DataInputStream(TEACryptor.decrypt(input.readAllBytes().let { it.copyOfRange(0, it.size - 2) }, when (type) {//todo: check array range
@@ -38,10 +40,10 @@ class Server0825Packet(private val type: Type, inputStream: DataInputStream) : S
                 token = data.readNBytes(167 - (16 - 2))
                 loginTime = data.readLong()//todo check
                 loginIP = data.readIP()
-
-                TODO("从易语言抄协议来")
+                tgtgtKey = getRandomKey(16);
             }
             else -> {
+                throw IllegalStateException()
             }
         }
     }
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt b/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
index f86a94d5e..3018fcfa1 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
@@ -3,6 +3,8 @@ package net.mamoe.mirai.util
 import net.mamoe.mirai.network.Protocol
 import java.io.ByteArrayOutputStream
 import java.io.DataOutputStream
+import java.util.*
+import java.util.zip.CRC32
 
 /**
  * @author Him188moe @ Mirai Project
@@ -32,6 +34,7 @@ fun UByteArray.toHexString(separator: String = ", "): String = Utils.toHexString
 
 fun Byte.toHexString(): String = this.toString(16)
 
+@ExperimentalUnsignedTypes
 fun String.hexToBytes(): ByteArray = Protocol.hexToBytes(this)
 @ExperimentalUnsignedTypes
 fun String.hexToUBytes(): UByteArray = Protocol.hexToUBytes(this)
@@ -40,4 +43,13 @@ open class ByteArrayDataOutputStream : DataOutputStream(ByteArrayOutputStream())
     open fun toByteArray(): ByteArray = (out as ByteArrayOutputStream).toByteArray()
     @ExperimentalUnsignedTypes
     open fun toUByteArray(): UByteArray = (out as ByteArrayOutputStream).toByteArray().toUByteArray();
-}
\ No newline at end of file
+}
+
+@ExperimentalUnsignedTypes
+fun getRandomKey(length: Int): ByteArray {
+    val bytes = LinkedList<Byte>();
+    for (i in 0..length) bytes.add((Math.random() * 255).toByte())
+    return bytes.toByteArray();
+}
+
+fun getCrc32(key: ByteArray): Long = with(CRC32()) { update(key); return@with this.value };
\ No newline at end of file