From cadb529588b0dc5b29008b134fc5896fbe52fd5b Mon Sep 17 00:00:00 2001
From: cssxsh <32539286+cssxsh@users.noreply.github.com>
Date: Sat, 12 Feb 2022 20:47:19 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=BA=E7=94=9F=E6=88=90=E7=9A=84=20IMEI=20?=
 =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E6=A0=A1=E9=AA=8C=E4=BD=8D=20(#1855)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* feat: luhn

* fix: China Country Code 86

* fix: China Country Code 86

* fix: China Country Code 86
---
 .../src/commonMain/kotlin/utils/DeviceInfo.kt | 20 ++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/mirai-core-api/src/commonMain/kotlin/utils/DeviceInfo.kt b/mirai-core-api/src/commonMain/kotlin/utils/DeviceInfo.kt
index d19e7136e..af9bb6922 100644
--- a/mirai-core-api/src/commonMain/kotlin/utils/DeviceInfo.kt
+++ b/mirai-core-api/src/commonMain/kotlin/utils/DeviceInfo.kt
@@ -152,10 +152,28 @@ public class DeviceInfo(
                 wifiBSSID = "02:00:00:00:00:00".toByteArray(),
                 wifiSSID = "<unknown ssid>".toByteArray(),
                 imsiMd5 = getRandomByteArray(16, random).md5(),
-                imei = getRandomIntString(15, random),
+                imei = "86${getRandomIntString(12, random)}".let { it + luhn(it) },
                 apn = "wifi".toByteArray()
             )
         }
+
+        /**
+         * 计算 imei 校验位
+         */
+        private fun luhn(imei: String): Int {
+            var odd = false
+            val zero = '0'
+            val sum = imei.sumOf { char ->
+                odd = !odd
+                if (odd) {
+                    char.code - zero.code
+                } else {
+                    val s = (char.code - zero.code) * 2
+                    s % 10 + s / 10
+                }
+            }
+            return (10 - sum % 10) % 10
+        }
     }
 
     /**