diff --git a/scripts/mitmproxy/pyproject.toml b/scripts/mitmproxy/pyproject.toml
new file mode 100644
index 0000000..0e81610
--- /dev/null
+++ b/scripts/mitmproxy/pyproject.toml
@@ -0,0 +1,8 @@
+# pyproject.toml
+[tool.pytest.ini_options]
+pythonpath = [
+  ".", "lib",
+]
+testpaths = [
+    "tests",
+]
\ No newline at end of file
diff --git a/scripts/mitmproxy/tests/data/blsync_packet_client.raw b/scripts/mitmproxy/tests/data/blsync_packet_client.raw
new file mode 100644
index 0000000..fea1636
Binary files /dev/null and b/scripts/mitmproxy/tests/data/blsync_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/blsync_packet_client.yaml b/scripts/mitmproxy/tests/data/blsync_packet_client.yaml
new file mode 100644
index 0000000..905f191
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/blsync_packet_client.yaml
@@ -0,0 +1,6 @@
+body_length: 20
+body_payload: {pr: 1, r: 1}
+body_type: 0
+id: 10006
+loco_command: BLSYNC
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/chatonroom_packet_client.raw b/scripts/mitmproxy/tests/data/chatonroom_packet_client.raw
new file mode 100644
index 0000000..3593a9d
Binary files /dev/null and b/scripts/mitmproxy/tests/data/chatonroom_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/chatonroom_packet_client.yaml b/scripts/mitmproxy/tests/data/chatonroom_packet_client.yaml
new file mode 100644
index 0000000..d2280b6
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/chatonroom_packet_client.yaml
@@ -0,0 +1,6 @@
+body_length: 60
+body_payload: {chatId: 9388759392670092, sc: 0, st: 0, token: 1693554522}
+body_type: 0
+id: 10016
+loco_command: CHATONROOM
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/chatonroom_packet_server.raw b/scripts/mitmproxy/tests/data/chatonroom_packet_server.raw
new file mode 100644
index 0000000..ee5f6f2
Binary files /dev/null and b/scripts/mitmproxy/tests/data/chatonroom_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/chatonroom_packet_server.yaml b/scripts/mitmproxy/tests/data/chatonroom_packet_server.yaml
new file mode 100644
index 0000000..375c851
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/chatonroom_packet_server.yaml
@@ -0,0 +1,23 @@
+body_length: 677
+body_payload:
+  a: [405368327, 405368740]
+  c: 9388759392670092
+  f: true
+  l: 0
+  m: []
+  o: 1693554522
+  pct: null
+  pi:
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAykBFu1jEsa4PW2keOTSAELXE/VCJqGqiYmc9J0NiYAGFZO5R1vcziBg957PJAGL6U3Ut8Y+iNpDyEk8310pswQVZL1r/AJEJL/WPUgyVT0xk40VC72xYGasi/Cao7Cq3ZJo+rk3tCQx7RCGA0GtyosoEvj0yCNI4/NH9TJhkaKXmFgWwp9d42m75TmGHFFbvEkPyFXtcwmNhJH3cgVHAMlMCaspedPHlK8FAdl0jt20VqaScN4VSx7E//9VX2tcMpM/9R80QX/42lD/62r2eC8tO+9jGuJWl0SKOidDXGF4061SleosWZMy2TyS5sk+/Bb777I9GSoJ0bge5wXyaGwIDAQAB,
+    pt: 3124392943946588704, sk: 0PahpeVCuIzcuIYql9HbFGc4J7Tl9CNTsRqj4ByvvCY=, u: 405368327}
+  r: null
+  sc: 3125740649914852441
+  status: 0
+  sui: 0
+  t: SDirectChat
+  w: [3125740641498169344, 3125740641498169344]
+body_type: 0
+id: 10016
+loco_command: CHATONROOM
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/checkin_packet_client.raw b/scripts/mitmproxy/tests/data/checkin_packet_client.raw
new file mode 100644
index 0000000..ad2d295
Binary files /dev/null and b/scripts/mitmproxy/tests/data/checkin_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/checkin_packet_client.yaml b/scripts/mitmproxy/tests/data/checkin_packet_client.yaml
new file mode 100644
index 0000000..71543c2
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/checkin_packet_client.yaml
@@ -0,0 +1,7 @@
+body_length: 99
+body_payload: {MCCMNC: '310260', appVer: 10.3.3, lang: en, ntype: 3, os: android,
+  userId: 405368740}
+body_type: 0
+id: 10002
+loco_command: CHECKIN
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/empty_loco_packet.raw b/scripts/mitmproxy/tests/data/empty_loco_packet.raw
new file mode 100644
index 0000000..8460078
Binary files /dev/null and b/scripts/mitmproxy/tests/data/empty_loco_packet.raw differ
diff --git a/scripts/mitmproxy/tests/data/empty_loco_packet.yaml b/scripts/mitmproxy/tests/data/empty_loco_packet.yaml
new file mode 100644
index 0000000..a32e897
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/empty_loco_packet.yaml
@@ -0,0 +1,6 @@
+body_length: 0
+body_payload: !!binary |
+body_type: 0
+id: 0
+loco_command: ''
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/encrypted_screate_packet_with_mitm_key.raw b/scripts/mitmproxy/tests/data/encrypted_screate_packet_with_mitm_key.raw
new file mode 100644
index 0000000..a77744e
Binary files /dev/null and b/scripts/mitmproxy/tests/data/encrypted_screate_packet_with_mitm_key.raw differ
diff --git a/scripts/mitmproxy/tests/data/encrypted_setsk_packet.raw b/scripts/mitmproxy/tests/data/encrypted_setsk_packet.raw
new file mode 100644
index 0000000..93f70d9
Binary files /dev/null and b/scripts/mitmproxy/tests/data/encrypted_setsk_packet.raw differ
diff --git a/scripts/mitmproxy/tests/data/getlpk_packet_client.raw b/scripts/mitmproxy/tests/data/getlpk_packet_client.raw
new file mode 100644
index 0000000..3bd73b9
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getlpk_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/getlpk_packet_client.yaml b/scripts/mitmproxy/tests/data/getlpk_packet_client.yaml
new file mode 100644
index 0000000..1c0aff0
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getlpk_packet_client.yaml
@@ -0,0 +1,8 @@
+body_length: 30
+body_payload:
+  mi: [405368327]
+  mu: false
+body_type: 0
+id: 10013
+loco_command: GETLPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/getlpk_packet_server.raw b/scripts/mitmproxy/tests/data/getlpk_packet_server.raw
new file mode 100644
index 0000000..5a92768
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getlpk_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/getlpk_packet_server.yaml b/scripts/mitmproxy/tests/data/getlpk_packet_server.yaml
new file mode 100644
index 0000000..e94ac81
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getlpk_packet_server.yaml
@@ -0,0 +1,11 @@
+body_length: 520
+body_payload:
+  pi:
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAykBFu1jEsa4PW2keOTSAELXE/VCJqGqiYmc9J0NiYAGFZO5R1vcziBg957PJAGL6U3Ut8Y+iNpDyEk8310pswQVZL1r/AJEJL/WPUgyVT0xk40VC72xYGasi/Cao7Cq3ZJo+rk3tCQx7RCGA0GtyosoEvj0yCNI4/NH9TJhkaKXmFgWwp9d42m75TmGHFFbvEkPyFXtcwmNhJH3cgVHAMlMCaspedPHlK8FAdl0jt20VqaScN4VSx7E//9VX2tcMpM/9R80QX/42lD/62r2eC8tO+9jGuJWl0SKOidDXGF4061SleosWZMy2TyS5sk+/Bb777I9GSoJ0bge5wXyaGwIDAQAB,
+    pt: 3124392943946588704, sk: 0PahpeVCuIzcuIYql9HbFGc4J7Tl9CNTsRqj4ByvvCY=, u: 405368327}
+  status: 0
+body_type: 0
+id: 10013
+loco_command: GETLPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/getmem_packet_client.raw b/scripts/mitmproxy/tests/data/getmem_packet_client.raw
new file mode 100644
index 0000000..348d6ec
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getmem_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/getmem_packet_client.yaml b/scripts/mitmproxy/tests/data/getmem_packet_client.yaml
new file mode 100644
index 0000000..136d357
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getmem_packet_client.yaml
@@ -0,0 +1,6 @@
+body_length: 21
+body_payload: {chatId: 4884554736017431}
+body_type: 0
+id: 10007
+loco_command: GETMEM
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/getmem_packet_server.raw b/scripts/mitmproxy/tests/data/getmem_packet_server.raw
new file mode 100644
index 0000000..533fd7a
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getmem_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/getmem_packet_server.yaml b/scripts/mitmproxy/tests/data/getmem_packet_server.yaml
new file mode 100644
index 0000000..9d0d88f
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getmem_packet_server.yaml
@@ -0,0 +1,19 @@
+body_length: 715
+body_payload:
+  members:
+  - {accountId: 262855419, fullProfileImageUrl: '', linkedServices: '', nickName: furztrocken,
+    originalProfileImageUrl: '', profileImageUrl: '', statusMessage: '', type: -999999,
+    userId: 405368740, ut: 0}
+  - {accountId: 0, fullProfileImageUrl: 
+      https://p.kakaocdn.net/th/talkp/wkvq5HO4yw/K2H6hBZUBidOkF4i5yu1p0/pu5dpg_640x640_s.jpg,
+    linkedServices: '', nickName: KakaoTalk, originalProfileImageUrl: 
+      https://p.kakaocdn.net/th/talkp/wkvq5HO4yw/K2H6hBZUBidOkF4i5yu1p0/pu5dpg_640x640_s.jpg,
+    profileImageUrl: 
+      https://p.kakaocdn.net/th/talkp/wkvq5HO4yw/K2H6hBZUBidOkF4i5yu1p0/pu5dpg_110x110_c.jpg,
+    statusMessage: KakaoTeam, type: -999999, userId: 69758567, ut: 1}
+  status: 0
+  token: 1693552382
+body_type: 0
+id: 10007
+loco_command: GETMEM
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/getpk_packet_client.raw b/scripts/mitmproxy/tests/data/getpk_packet_client.raw
new file mode 100644
index 0000000..7c5f193
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getpk_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/getpk_packet_client.yaml b/scripts/mitmproxy/tests/data/getpk_packet_client.yaml
new file mode 100644
index 0000000..b2101f6
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getpk_packet_client.yaml
@@ -0,0 +1,8 @@
+body_length: 45
+body_payload:
+  mi: [405368327]
+  pt: [3124319739752240031]
+body_type: 0
+id: 10014
+loco_command: GETPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/getpk_packet_server.raw b/scripts/mitmproxy/tests/data/getpk_packet_server.raw
new file mode 100644
index 0000000..78745fc
Binary files /dev/null and b/scripts/mitmproxy/tests/data/getpk_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/getpk_packet_server.yaml b/scripts/mitmproxy/tests/data/getpk_packet_server.yaml
new file mode 100644
index 0000000..f30c0be
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/getpk_packet_server.yaml
@@ -0,0 +1,14 @@
+body_length: 1014
+body_payload:
+  pi:
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo1v7+3uOUiAJboG0rVrcoKDi31CuGWPS5h0aKCOwFxY+Epd7MLsCar1FY7tpaz4E0eDse3J60FfRmohDky30f4jVpjTVF4U18VRJY6ex8yAR80/ZLVPbzcOnEwWOYsD+6WzY7UipoQn6osx+0rsTy86WndlSouKXm3cJmFFoIXFupTXMlvU44gQOhXlYOXs+jNnL7eL+6pJS76/mYXoLX1vEtCi3HfdXm3jw5aQMIjCCIRNE375xZz8ZwVyFXMu3A780uWbLPPs/5uPyYZnBCFdunqq/mWDjMeYnia2ncUyN7Il18EGQ8dxQqA26bEZ8A5DV5PEzzUDRIPkxWg2pGwIDAQAB,
+    pt: 3124319739752240031, sk: x6yH7enPDewXgW+pI4gUTO1n9Yw2M6hTI9jQgl8goLU=, u: 405368327}
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAykBFu1jEsa4PW2keOTSAELXE/VCJqGqiYmc9J0NiYAGFZO5R1vcziBg957PJAGL6U3Ut8Y+iNpDyEk8310pswQVZL1r/AJEJL/WPUgyVT0xk40VC72xYGasi/Cao7Cq3ZJo+rk3tCQx7RCGA0GtyosoEvj0yCNI4/NH9TJhkaKXmFgWwp9d42m75TmGHFFbvEkPyFXtcwmNhJH3cgVHAMlMCaspedPHlK8FAdl0jt20VqaScN4VSx7E//9VX2tcMpM/9R80QX/42lD/62r2eC8tO+9jGuJWl0SKOidDXGF4061SleosWZMy2TyS5sk+/Bb777I9GSoJ0bge5wXyaGwIDAQAB,
+    pt: 3124392943946588704, sk: 0PahpeVCuIzcuIYql9HbFGc4J7Tl9CNTsRqj4ByvvCY=, u: 405368327}
+  status: 0
+body_type: 0
+id: 10014
+loco_command: GETPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/gettoken_packet_client.raw b/scripts/mitmproxy/tests/data/gettoken_packet_client.raw
new file mode 100644
index 0000000..fdfe1d2
Binary files /dev/null and b/scripts/mitmproxy/tests/data/gettoken_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/gettoken_packet_client.yaml b/scripts/mitmproxy/tests/data/gettoken_packet_client.yaml
new file mode 100644
index 0000000..0089d5e
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/gettoken_packet_client.yaml
@@ -0,0 +1,7 @@
+body_length: 70
+body_payload:
+  ts: [2, 3, 11, 12, 4, 9, 10, 15]
+body_type: 0
+id: 10005
+loco_command: GETTOKEN
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/gettoken_packet_server.raw b/scripts/mitmproxy/tests/data/gettoken_packet_server.raw
new file mode 100644
index 0000000..6d4cf7a
Binary files /dev/null and b/scripts/mitmproxy/tests/data/gettoken_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/gettoken_packet_server.yaml b/scripts/mitmproxy/tests/data/gettoken_packet_server.yaml
new file mode 100644
index 0000000..5527594
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/gettoken_packet_server.yaml
@@ -0,0 +1,9 @@
+body_length: 179
+body_payload:
+  os: [0, 0, 0, 1, 0, 0, 0, 0]
+  status: 0
+  ts: [2, 3, 11, 12, 4, 9, 10, 15]
+body_type: 0
+id: 10005
+loco_command: GETTOKEN
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/loginlist_packet_client.raw b/scripts/mitmproxy/tests/data/loginlist_packet_client.raw
new file mode 100644
index 0000000..c68a88f
Binary files /dev/null and b/scripts/mitmproxy/tests/data/loginlist_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/loginlist_packet_client.yaml b/scripts/mitmproxy/tests/data/loginlist_packet_client.yaml
new file mode 100644
index 0000000..a1e16c9
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/loginlist_packet_client.yaml
@@ -0,0 +1,22 @@
+body_length: 346
+body_payload:
+  MCCMNC: '310260'
+  appVer: 10.3.3
+  bg: false
+  chatIds: []
+  duuid: 295c990ec4b3470b9df03827b4a9e38b5caf17cfc010bb18abab9aee622ec5f8
+  lang: en
+  lastTokenId: 0
+  lbk: 0
+  maxIds: []
+  ntype: 3
+  oauthToken: 55027f93d571437fb5c602a526a77ee300000016935523756660010yGWgXyzccO
+  os: android
+  prtVer: '1'
+  revision: 0
+  rp: !!binary |
+    AAD//wAA
+body_type: 0
+id: 10003
+loco_command: LOGINLIST
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/loginlist_packet_client_0.raw b/scripts/mitmproxy/tests/data/loginlist_packet_client_0.raw
new file mode 100644
index 0000000..699756c
Binary files /dev/null and b/scripts/mitmproxy/tests/data/loginlist_packet_client_0.raw differ
diff --git a/scripts/mitmproxy/tests/data/loginlist_packet_client_0.yaml b/scripts/mitmproxy/tests/data/loginlist_packet_client_0.yaml
new file mode 100644
index 0000000..53d315c
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/loginlist_packet_client_0.yaml
@@ -0,0 +1,22 @@
+body_length: 346
+body_payload:
+  MCCMNC: '310260'
+  appVer: 10.3.3
+  bg: false
+  chatIds: []
+  duuid: 295c990ec4b3470b9df03827b4a9e38b5caf17cfc010bb18abab9aee622ec5f8
+  lang: en
+  lastTokenId: 3125722688938653164
+  lbk: 1693552381
+  maxIds: []
+  ntype: 3
+  oauthToken: 55027f93d571437fb5c602a526a77ee300000016935523756660010yGWgXyzccO
+  os: android
+  prtVer: '1'
+  revision: 28
+  rp: !!binary |
+    AQD//wEA
+body_type: 0
+id: 10011
+loco_command: LOGINLIST
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/loginlist_packet_server_0.raw b/scripts/mitmproxy/tests/data/loginlist_packet_server_0.raw
new file mode 100644
index 0000000..9994a6d
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/loginlist_packet_server_0.raw
@@ -0,0 +1,49 @@
+body_length: 1499
+body_payload:
+  chatDatas:
+  - a: 2
+    c: 4884554736017431
+    i: [69758567]
+    k: [KakaoTalk]
+    l: {attachment: "{\"P\":{\"TP\":\"Feed\",\"ME\":\"KakaoTalk Login Attempt\",\"\
+        SID\":\"plusfriend_tms\",\"DID\":\"https://auth.kakao.com/fa/main.html?close_on_back=true&close_on_completion=true&page=block_try_talk_login&token=%2FdGRqWvV%2F5kbRw%2B%2FD1MEE8DtZEr7AEABKCrv3piI8us%3D\"\
+        ,\"SDID\":\"69758567\",\"FW\":false,\"KV\":true,\"AD\":false,\"A\":{\"version\"\
+        :1,\"code\":\"34O1972BXONLsjAcpwrH1ivompzIKPpkfJP8Chtqu7k=\",\"createdAt\"\
+        :1693552120617}},\"C\":{\"TI\":{\"FT\":true,\"TD\":{\"T\":\"KakaoTalk Login
+        Attempt\",\"D\":\"KakaoTalk Login Attempt\\n\\n-Date : Fri Sep 1 16:08 (Korea
+        Standard Time/UTC+9)\\n-Device : SDK_GPHONE_ARM64\\n-IP : 83.171.160.13\\
+        n\\nIf you don't recognize this activity, you may temporarily lock your account
+        to protect it.\\n\\n\"}},\"BUL\":[{\"BU\":{\"T\":\"Lock My Account\",\"HL\"\
+        :null},\"L\":{\"LMO\":\"https://auth.kakao.com/fa/main.html?close_on_back=true&close_on_completion=true&page=block_try_talk_login&token=%2FdGRqWvV%2F5kbRw%2B%2FD1MEE8DtZEr7AEABKCrv3piI8us%3D\"\
+        }}],\"BUT\":1}}", authorId: 69758567, chatId: 4884554736017431, logId: 3125720503930142720,
+      message: KakaoTalk Login Attempt, msgId: 1693552192251, prevId: 3124400535045228544,
+      referer: 0, sendAt: 1693552121, type: 71}
+    ll: 3125720503930142720
+    m: null
+    ml: 3123783401472000000
+    mmr: 0
+    n: 2
+    o: 0
+    p: true
+    s: 3122239915491457024
+    t: PlusChat
+  delChatIds: [4503599627370497]
+  eof: true
+  kc: []
+  lastTokenId: 3125740458250115451
+  lbk: 1693552381
+  ltk: 0
+  mcmRevision: 0
+  minLogId: 3123783401472000000
+  pkToken: 3125722692958571562
+  revision: 28
+  revisionInfo: '[]'
+  rp: !!binary |
+    AQABAAEA
+  sb: 1
+  status: 0
+  userId: 405368740
+body_type: 0
+id: 10011
+loco_command: LOGINLIST
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/screate_loco_packet.yaml b/scripts/mitmproxy/tests/data/screate_loco_packet.yaml
new file mode 100644
index 0000000..57f8ed0
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/screate_loco_packet.yaml
@@ -0,0 +1,34 @@
+body_length: 1249
+body_payload:
+  c: 9388354540351878
+  nc: true
+  pi:
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyfkeppzP/qOIUXRqzHt+KjE/sz5tMCwf3Y7Xz+SoDU2kYVTjZS1NWtNMT4gFhiVVsX+uwdwEU0ijgg07zX9GM45HZJoj+Wrb58pNHBUqfksR/oXcX5jBASDh3Oks7Naw2FLdtFdqh1uISzYKA7Ubo0C8ep4N7PVYJdJvsa83nFYbfVi7WTCZJqixla4of+yVaj+XNq/+n8hew8pJEW2hx1szJjqfZSskTTUwASiWBTSdHktnv6y7N8Ls32buAfZu+Oqzw5DRJrWL8iLLx9hkM1T5dPTrc2RcabuG/YiamPaVN9P1iGz2HM9b0fUBFvH8e8REaujlOQVr3cyl/rezdQIDAQAB,
+    pt: 3122418946040168677, sk: odgQ7ds/Pz9AlC7kNSVCLFHZAvRCMUVPzc3R3FZlqAI=, u: 405368327}
+  r:
+    activeMemberIds: [405368740, 405368327]
+    chatId: 9388354540351878
+    lastLogId: 0
+    lastMessage: null
+    lastUpdatedAt: null
+    members:
+    - {accountId: 262855419, countryIso: DE, fullProfileImageUrl: '', linkedServices: '',
+      nickName: furztrocken, originalProfileImageUrl: '', profileImageUrl: '', statusMessage: '',
+      suspended: false, type: -999999, userId: 405368740}
+    - {accountId: 256190398, countryIso: DE, fullProfileImageUrl: '', linkedServices: '',
+      nickName: peterplan, originalProfileImageUrl: '', profileImageUrl: '', statusMessage: '',
+      suspended: false, type: -999999, userId: 405368327}
+    metaRevisions: null
+    newMessageCount: -1
+    o: 1693159158
+    pct: null
+    pushAlert: null
+    type: SDirectChat
+    watermarks: [3122424091315798016, 3122424091315798016]
+  sc: 3122424099724080067
+  status: 0
+body_type: 0
+id: 10291
+loco_command: SCREATE
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/screate_packet_client.raw b/scripts/mitmproxy/tests/data/screate_packet_client.raw
new file mode 100644
index 0000000..c7dc896
Binary files /dev/null and b/scripts/mitmproxy/tests/data/screate_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/screate_packet_client.yaml b/scripts/mitmproxy/tests/data/screate_packet_client.yaml
new file mode 100644
index 0000000..db336ac
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/screate_packet_client.yaml
@@ -0,0 +1,7 @@
+body_length: 25
+body_payload:
+  mi: [405368327]
+body_type: 0
+id: 10015
+loco_command: SCREATE
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/screate_packet_server.raw b/scripts/mitmproxy/tests/data/screate_packet_server.raw
new file mode 100644
index 0000000..cd9c58c
Binary files /dev/null and b/scripts/mitmproxy/tests/data/screate_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/screate_packet_server.yaml b/scripts/mitmproxy/tests/data/screate_packet_server.yaml
new file mode 100644
index 0000000..377f511
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/screate_packet_server.yaml
@@ -0,0 +1,34 @@
+body_length: 1249
+body_payload:
+  c: 9388759392670092
+  nc: true
+  pi:
+  - {cs: '', ek: 
+      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAykBFu1jEsa4PW2keOTSAELXE/VCJqGqiYmc9J0NiYAGFZO5R1vcziBg957PJAGL6U3Ut8Y+iNpDyEk8310pswQVZL1r/AJEJL/WPUgyVT0xk40VC72xYGasi/Cao7Cq3ZJo+rk3tCQx7RCGA0GtyosoEvj0yCNI4/NH9TJhkaKXmFgWwp9d42m75TmGHFFbvEkPyFXtcwmNhJH3cgVHAMlMCaspedPHlK8FAdl0jt20VqaScN4VSx7E//9VX2tcMpM/9R80QX/42lD/62r2eC8tO+9jGuJWl0SKOidDXGF4061SleosWZMy2TyS5sk+/Bb777I9GSoJ0bge5wXyaGwIDAQAB,
+    pt: 3124392943946588704, sk: 0PahpeVCuIzcuIYql9HbFGc4J7Tl9CNTsRqj4ByvvCY=, u: 405368327}
+  r:
+    activeMemberIds: [405368740, 405368327]
+    chatId: 9388759392670092
+    lastLogId: 0
+    lastMessage: null
+    lastUpdatedAt: null
+    members:
+    - {accountId: 262855419, countryIso: DE, fullProfileImageUrl: '', linkedServices: '',
+      nickName: furztrocken, originalProfileImageUrl: '', profileImageUrl: '', statusMessage: '',
+      suspended: false, type: -999999, userId: 405368740}
+    - {accountId: 256190398, countryIso: DE, fullProfileImageUrl: '', linkedServices: '',
+      nickName: peterplan, originalProfileImageUrl: '', profileImageUrl: '', statusMessage: '',
+      suspended: false, type: -999999, userId: 405368327}
+    metaRevisions: null
+    newMessageCount: -1
+    o: 1693554522
+    pct: null
+    pushAlert: null
+    type: SDirectChat
+    watermarks: [3125740641498169344, 3125740641498169344]
+  sc: 3125740649914852441
+  status: 0
+body_type: 0
+id: 10015
+loco_command: SCREATE
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setpk_packet_client.raw b/scripts/mitmproxy/tests/data/setpk_packet_client.raw
new file mode 100644
index 0000000..601a025
Binary files /dev/null and b/scripts/mitmproxy/tests/data/setpk_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/setpk_packet_client.yaml b/scripts/mitmproxy/tests/data/setpk_packet_client.yaml
new file mode 100644
index 0000000..f859455
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setpk_packet_client.yaml
@@ -0,0 +1,13 @@
+body_length: 1006
+body_payload: {cs: 
+    GT8Z+D5U4FNWyD3EDrJw+udvhP4F27EgP6D7Cx7x4Qqxr9f4ghnHFNURIyZfWtMMfY/9HuNrn1YjAhrcVayoAQ==,
+  ek: 
+    MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsfQxCfx1vkzioz8UtBR/YfWaUGHKZUuXyg1Bhbi8fAtUORvX4tDOc5wb+zYfq/Vb3kywuJsnQo8RHQ6pBTcxHNc7Vcl1RDAynnysFdJNqjXgKRN/egcPQXYb0Hi3r1VI4bWH8TGEJm8AEKzq5PtSo46X1SR/e6wOa3IxRv2hFTKT7zdp7ThwuhpVx9GxuqyEcKSHHTTk+z5V10JuO9EKZR8ybuDv9FyxIVR5BVO+RSC4dCpjSZf1h/j6frft4/TfYkr1KlycqWW04fFiEUmADWAsV7BMB+kEofxIQUpCVO8X7Eo3lrKA3neetLZ7rX/e5RS4LbrkGK4AzcNBsSLKawIDAQAB,
+  sd: 
+    0ed8pkaGnT1Iy+xFMz0wO0zsqwlb/PkMWA8AyNO0gC1bqLDifdj3KFDtwPksXd6sGo5JyoZKFnR6ffnmCGNUBg==,
+  sk: ZZ5eu1z1LSETep51/j2F31uRpqYh7cJISSs0SHhcpfI=, sr: 
+    Cz42sP8mM8FFReM9J7c/BqXjo7FiJcDkLwoQ9I9F9gIrzIUoxohmz8L2pCqB2Hcb4sTG/xkAHnvgMn3Xvou/PhDBh7X0e4ew4oU9rGP+MAkOLL2UqXJy+oI+N/Tw25J1yddZkNrFrC2+HtVyLJjsWgenoKDVKOk/qJo1TBYVLaWiIuQz560hzhv7t+z0807Pj0NihvegLx5EE0B9pGa4jJQL7jtYWPEa4/PxeeE5OIbWes71RqD6PzEecIj9r/DZ8xYoaHwqodQbcmv972CWNh3MJPZhJxuRquxTI1BhF9t0/TVMPp4GzR/s+AM8341lwDRoIdC9ANNk/xMs/0Y6Pg==}
+body_type: 0
+id: 10004
+loco_command: SETPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setpk_packet_server.raw b/scripts/mitmproxy/tests/data/setpk_packet_server.raw
new file mode 100644
index 0000000..65f1b06
Binary files /dev/null and b/scripts/mitmproxy/tests/data/setpk_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/setpk_packet_server.yaml b/scripts/mitmproxy/tests/data/setpk_packet_server.yaml
new file mode 100644
index 0000000..2c05e14
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setpk_packet_server.yaml
@@ -0,0 +1,6 @@
+body_length: 33
+body_payload: {pt: 3125722692958571562, r: true, status: 0}
+body_type: 0
+id: 10004
+loco_command: SETPK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_kakaotalk_key.yaml b/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_kakaotalk_key.yaml
new file mode 100644
index 0000000..6bc7d1f
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_kakaotalk_key.yaml
@@ -0,0 +1,16 @@
+body_length: 911
+body_payload:
+  c: 9388354540351878
+  mi: [405368327, 405368740]
+  mp: [3122418946040168677, 3122241999402188784]
+  pt: 3122241999402188784
+  s: 
+    QjlDPq44qpmfBcO6+B4H99S6kpwV+Ih7KmoYCd7Y7nXLpWrGG34IYEVgg05RAxA3quwsNskiodMtePciZQ+RAw==
+  sc: 3122424099724080067
+  sk: [
+    XEnm14ddEydSisfjnb8LUO5vUmBd8EGWss6D0XACcgFKhOQ4370KQy+jDWszAjnJYeToKkBlPbToGjRk6efA4QtBqQeXCRoEpH+Z3bwtFjxcLwGRK22L2qOlxF8fjaJUswBkonLv9M2DeyZp7So2EsLQELrdwgggmry1uxnZqblXOG+6vnq3sYsR2ef7L45Ui2gaIUobEq4HgJJQrE8zp61muexPOMv3Nbj1pRduStBhy9MQ3ZZEuNPSg/6/4lpww8blIDT0HJxrOmXMt+rboaq3hSUfTR/fMIA/Xsxk7PM+nRtDhIsAib8EO5Uwl2L+fWv7QO8DQKM/5ivfgp9fXw==,
+    Gxh/DpE4+OozxtQmEbmc3Io/Gq+Ynoqpf4IxhSKYdINdePYR0pgggMRUSgJDUe9AkBd5ZiaconSC3CPA9uHdTSvzmHSvHWZJY6po6SbnPnTrSljdQmb6wcVVKKzPXMokp2p4AghGO+U/fIB5O9c0JDnkqgHgkGjsXbgXCZhaaNZpYAypjL8GZwFqnLBKKjJnWsWISD5LUO/78rD++uOvUCg5r+1cxkLH6+BNiU8pGuuCNMnwuowWwG4a8Q0lJjOSKJkV7wtaGEcYmQ0GDYi6n618N168v9VQvLT7P0Mdxaxvl3/KnkupD0IzZENF0odsWMLyNUcSIMfhrM0J7q4A3A==]
+body_type: 0
+id: 10293
+loco_command: SETSK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_mitm_key.yaml b/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_mitm_key.yaml
new file mode 100644
index 0000000..41ea37d
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setsk_loco_packet_sk_enc_with_mitm_key.yaml
@@ -0,0 +1,16 @@
+body_length: 911
+body_payload:
+  c: 9388354540351878
+  mi: [405368327, 405368740]
+  mp: [3122418946040168677, 3122241999402188784]
+  pt: 3122241999402188784
+  s: 
+    QjlDPq44qpmfBcO6+B4H99S6kpwV+Ih7KmoYCd7Y7nXLpWrGG34IYEVgg05RAxA3quwsNskiodMtePciZQ+RAw==
+  sc: 3122424099724080067
+  sk: [
+    rmf4zi9VAlvp8YpAECfArw2AdQOg4srpQqNr33TQG2O121NBuZMQV5mrj2ZzIgK3gbPcY8RG7mkt2QNxpe/f9cvJ4BapVMvzmzd/F9TqMhQCpR1c2xNa9zIs7+V7uzTNaRp5mLTMfhb1nvIf5DroHJk+ODyXGH+FTDCrpj1sVpW/p2sJvDuGXRWKYQUCFcXf3/6XdJe9uRaKgPvrfVaW1u4IewhtyvzWZamG0yu6zui3xidQ4eLkZN7L6OJ12tyoeUCVSTB3082BM9Kl4jRg49T1l7EMp3eC/Y6Co+H692//As4+WYbpxZaPn3EzvWnKi7Bd/aWiwKaQBA9eNtxGVQ==,
+    Gxh/DpE4+OozxtQmEbmc3Io/Gq+Ynoqpf4IxhSKYdINdePYR0pgggMRUSgJDUe9AkBd5ZiaconSC3CPA9uHdTSvzmHSvHWZJY6po6SbnPnTrSljdQmb6wcVVKKzPXMokp2p4AghGO+U/fIB5O9c0JDnkqgHgkGjsXbgXCZhaaNZpYAypjL8GZwFqnLBKKjJnWsWISD5LUO/78rD++uOvUCg5r+1cxkLH6+BNiU8pGuuCNMnwuowWwG4a8Q0lJjOSKJkV7wtaGEcYmQ0GDYi6n618N168v9VQvLT7P0Mdxaxvl3/KnkupD0IzZENF0odsWMLyNUcSIMfhrM0J7q4A3A==]
+body_type: 0
+id: 10293
+loco_command: SETSK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setsk_packet_client_0.raw b/scripts/mitmproxy/tests/data/setsk_packet_client_0.raw
new file mode 100644
index 0000000..b3289f4
Binary files /dev/null and b/scripts/mitmproxy/tests/data/setsk_packet_client_0.raw differ
diff --git a/scripts/mitmproxy/tests/data/setsk_packet_client_0.yaml b/scripts/mitmproxy/tests/data/setsk_packet_client_0.yaml
new file mode 100644
index 0000000..0e32500
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setsk_packet_client_0.yaml
@@ -0,0 +1,16 @@
+body_length: 911
+body_payload:
+  c: 9388759392670092
+  mi: [405368327, 405368740]
+  mp: [3124392943946588704, 3125722692958571562]
+  pt: 3125722692958571562
+  s: 
+    rIX8Be5HIKVLNxIUVvCvW0Lt3EZb7NATRksklDRZicAUbJLNfsCaN7wNtSw9dr4g+A1+04lUOqGSpcPSxRWECQ==
+  sc: 3125740649914852441
+  sk: [
+      ozfnEbdrd0618APqMVe26HG6rcbdULhgUSLt46QE9kzuyIPHxYjH2so0fqjkwt3AYGCENeYuPNxFo3NgGFtDNGMxaMcbbidRd/qpwhX6F6Y5gdf1FSGrhn5l5zTEcx6CRhvyz89WlxV/2lFfujaM2qy3tpSTL1NcUqOW2GWyNpLrFSMSIPOd1O4Ad/+1iHiN9ngRVjZWj2XPoXiaiPHh2RE74k9+n5u+2eVqnMKt5lYpX2K6RUNIr5rPnh0JzNruIA0CLbNTpakkIu0BBKkkAy0JHb9ccDWntCAzfxh3KF9lLy2xX9YxViAh1rkcl2Fysh2SAj69pXlZWdb4LRR6Sg==,
+    LbGCBNct8F2hv6JkGH+VvCPYCgVjaBs8SCHPqtjd4QJsrlA20rZng81hSL5FhcY+BO8bCzfPzWzK9iPLexDA4BT0TLls8Lt7awP7sz0hK62/HDHDit5ln911+x57Y361eQ2lcJqeOF3Qsa58jyAPfEiiNe6unchcWjZv8Ir5HKos7uEKCCynxmwu9i2Cl91ZVNUeIp7DOchZbg5/XS9tbyxUzf4cRVXmRXlQRePqXPuMy1ClmYX3cectY2waPanfDQxtLtHfESIEgkonyvdvndVRIERNI3ZOiKphHkRGiEJwYJ440j6n2pTvchRkmu4VlrziBxcJiYJvodQveWuHJg==]
+body_type: 0
+id: 10017
+loco_command: SETSK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/setsk_packet_server.raw b/scripts/mitmproxy/tests/data/setsk_packet_server.raw
new file mode 100644
index 0000000..474197f
Binary files /dev/null and b/scripts/mitmproxy/tests/data/setsk_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/setsk_packet_server.yaml b/scripts/mitmproxy/tests/data/setsk_packet_server.yaml
new file mode 100644
index 0000000..77429b3
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/setsk_packet_server.yaml
@@ -0,0 +1,6 @@
+body_length: 17
+body_payload: {status: 0}
+body_type: 0
+id: 10017
+loco_command: SETSK
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/swrite_packet_client.raw b/scripts/mitmproxy/tests/data/swrite_packet_client.raw
new file mode 100644
index 0000000..97157a8
Binary files /dev/null and b/scripts/mitmproxy/tests/data/swrite_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/swrite_packet_client.yaml b/scripts/mitmproxy/tests/data/swrite_packet_client.yaml
new file mode 100644
index 0000000..9541594
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/swrite_packet_client.yaml
@@ -0,0 +1,9 @@
+body_length: 196
+body_payload: {c: 9388759392670092, e: g8M=, m: rNu7YQ==, mid: 1337486070, pt: 3125722692958571562,
+  s: 
+    2/V7NhvGlBOJJdnqT9rWB3oTVmNVJeC8k3dKe72Vax2DMneXc43fUmM6xSJme4Kp4WyL1wcjIovZ4t1IbaNhCg==,
+  sc: 3125740649914852441, st: 3125740649914852441, t: 268435457}
+body_type: 0
+id: 10018
+loco_command: SWRITE
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/swrite_packet_server.raw b/scripts/mitmproxy/tests/data/swrite_packet_server.raw
new file mode 100644
index 0000000..18880dd
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/swrite_packet_server.raw
@@ -0,0 +1,7 @@
+body_length: 73
+body_payload: {c: 9388759392670092, l: 3125740656103546881, m: 1337486070, prevId: 0,
+  s: 1693554522, status: 0}
+body_type: 0
+id: 10018
+loco_command: SWRITE
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/syncmsg_packet_client.raw b/scripts/mitmproxy/tests/data/syncmsg_packet_client.raw
new file mode 100644
index 0000000..b71cb1a
Binary files /dev/null and b/scripts/mitmproxy/tests/data/syncmsg_packet_client.raw differ
diff --git a/scripts/mitmproxy/tests/data/syncmsg_packet_client.yaml b/scripts/mitmproxy/tests/data/syncmsg_packet_client.yaml
new file mode 100644
index 0000000..70e2f3f
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/syncmsg_packet_client.yaml
@@ -0,0 +1,6 @@
+body_length: 56
+body_payload: {chatId: 9388759392670092, cnt: 1, cur: 0, max: 3125740656103546881}
+body_type: 0
+id: 10019
+loco_command: SYNCMSG
+status_code: 0
diff --git a/scripts/mitmproxy/tests/data/syncmsg_packet_server.raw b/scripts/mitmproxy/tests/data/syncmsg_packet_server.raw
new file mode 100644
index 0000000..d41205e
Binary files /dev/null and b/scripts/mitmproxy/tests/data/syncmsg_packet_server.raw differ
diff --git a/scripts/mitmproxy/tests/data/syncmsg_packet_server.yaml b/scripts/mitmproxy/tests/data/syncmsg_packet_server.yaml
new file mode 100644
index 0000000..43f876a
--- /dev/null
+++ b/scripts/mitmproxy/tests/data/syncmsg_packet_server.yaml
@@ -0,0 +1,15 @@
+body_length: 402
+body_payload:
+  chatLogs:
+  - {attachment: g8M=, authorId: 405368740, chatId: 9388759392670092, logId: 3125740656103546881,
+    message: rNu7YQ==, msgId: 1337486070, prevId: 0, sInfo: '{"s":"2/V7NhvGlBOJJdnqT9rWB3oTVmNVJeC8k3dKe72Vax2DMneXc43fUmM6xSJme4Kp4WyL1wcjIovZ4t1IbaNhCg==","st":3125740649914852441,"pt":3125722692958571562}',
+    sendAt: 1693554523, type: 268435457}
+  isOK: false
+  jsi: 3125740641498169344
+  lastTokenId: 3125740663907061601
+  minLogId: 3123783401472000000
+  status: 0
+body_type: 0
+id: 10019
+loco_command: SYNCMSG
+status_code: 0
diff --git a/scripts/mitmproxy/tests/test_loco_parser.py b/scripts/mitmproxy/tests/test_loco_parser.py
new file mode 100644
index 0000000..3afaa55
--- /dev/null
+++ b/scripts/mitmproxy/tests/test_loco_parser.py
@@ -0,0 +1,219 @@
+import base64
+from pathlib import Path
+from typing import Final
+
+import pytest
+import ruamel.yaml
+from cryptography.hazmat.primitives import hashes, serialization
+from cryptography.hazmat.primitives.asymmetric import padding
+from lib.crypto_utils import get_rsa_public_key_pem, rsa_decrypt, rsa_encrypt
+from lib.loco_parser import LocoEncryptedPacket, LocoPacket, LocoParser
+
+yaml = ruamel.yaml.YAML(typ="safe", pure=True)
+
+_LOCO_ENYCRYPTED_PACKETS_RAW: Final = [
+    "blsync_packet_client.raw",
+    "chatonroom_packet_client.raw",
+    "chatonroom_packet_server.raw",
+    "checkin_packet_client.raw",
+    "empty_loco_packet.raw",
+    "getlpk_packet_client.raw",
+    "getlpk_packet_server.raw",
+    "getmem_packet_client.raw",
+    "getmem_packet_server.raw",
+    "getpk_packet_client.raw",
+    "getpk_packet_server.raw",
+    "gettoken_packet_client.raw",
+    "gettoken_packet_server.raw",
+    "loginlist_packet_client.raw",
+    "loginlist_packet_client_0.raw",
+    "screate_packet_client.raw",
+    "screate_packet_server.raw",
+    "setpk_packet_client.raw",
+    "setpk_packet_server.raw",
+    "setsk_packet_client_0.raw",
+    "setsk_packet_server.raw",
+    "swrite_packet_client.raw",
+    "syncmsg_packet_client.raw",
+    "syncmsg_packet_server.raw",
+]
+_LOCO_PACKETS_YAML: Final = [
+    "blsync_packet_client.yaml",
+    "chatonroom_packet_client.yaml",
+    "chatonroom_packet_server.yaml",
+    "checkin_packet_client.yaml",
+    "empty_loco_packet.yaml",
+    "getlpk_packet_client.yaml",
+    "getlpk_packet_server.yaml",
+    "getmem_packet_client.yaml",
+    "getmem_packet_server.yaml",
+    "getpk_packet_client.yaml",
+    "getpk_packet_server.yaml",
+    "gettoken_packet_client.yaml",
+    "gettoken_packet_server.yaml",
+    "loginlist_packet_client.yaml",
+    "loginlist_packet_client_0.yaml",
+    "screate_packet_client.yaml",
+    "screate_packet_server.yaml",
+    "setpk_packet_client.yaml",
+    "setpk_packet_server.yaml",
+    "setsk_packet_client_0.yaml",
+    "setsk_packet_server.yaml",
+    "swrite_packet_client.yaml",
+    "syncmsg_packet_client.yaml",
+    "syncmsg_packet_server.yaml",
+]
+_IV: Final = 16 * b"\x00"
+_KAKAOTALK_RSA_PUBLIC_KEY: Final = b"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9itiCdmMHYWJXq4GE0Xm\ncYy2/ifVv7lYZgPkqw2hjhhhPRYBGchuWUrWynqK0lQODvRIOyM3Q9khv8CPKss2\nipkBbQ4HHRSmpR346TbMQrTUjUCDSSfyY8Awy+DjGzWfn46uY0sHutP6wbGNhlmq\nc8mLP1mjAePYXE3QL1o1oWxhMqyRNY/RSrYMnqowt4u1/Fb3TVQ99uq6q7GkSWJC\nW+ALzx8eTHqnDUl7VqIS0EfNrHsExaR8m5HubWjfg8ZGX4+NNd9kNEINXTVfAcGH\nZ6XuMT1bdeW/F3IbAslbfH7Uj3LRTQhZ8iDzG19DIQy73s/IajPmQllFJaDdIr/w\nFQIDAQAB"
+_SHARED_SECRET: Final = b"SHARED_SECRET"
+
+
+def get_rsa_2048_key_pair():
+    key_pair_pem = b"-----BEGIN PRIVATE KEY-----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\nh5FwC5Myfu2oxAqtvX6ii9g=\n-----END PRIVATE KEY-----\n"
+    return serialization.load_pem_private_key(key_pair_pem, password=None)
+
+
+@pytest.fixture
+def parser():
+    return LocoParser()
+
+
+@pytest.fixture(params=_LOCO_PACKETS_YAML)
+def loco_packet_packet(request):
+    with open(Path(request.param), encoding="utf-8") as packet_yaml:
+        loco_packet_dict = yaml.load(packet_yaml)
+
+    return LocoPacket(
+        loco_packet_dict.get("id"),
+        loco_packet_dict.get("status_code"),
+        loco_packet_dict.get("loco_command"),
+        loco_packet_dict.get("body_type"),
+        loco_packet_dict.get("body_length"),
+        loco_packet_dict.get("body_payload"),
+    )
+
+
+@pytest.fixture
+def loco_encrypted_packet():
+    return LocoEncryptedPacket(length=0, iv=_IV, payload=b"")
+
+
+@pytest.fixture(params=zip(_LOCO_ENYCRYPTED_PACKETS_RAW, _LOCO_PACKETS_YAML))
+def loco_zip(request):
+    return request.param
+
+
+def test_parse(parser, loco_zip):
+    encrypted_loco_packet_path, loco_packet_yaml_path = loco_zip
+
+    with open(encrypted_loco_packet_path, "rb") as packet_raw, open(
+        loco_packet_yaml_path, encoding="utf-8"
+    ) as packet_yaml:
+        encrypted_loco_packet = packet_raw.read()
+        loco_packet_dict = yaml.load(packet_yaml)
+
+    parser.parse(encrypted_loco_packet)
+
+    packet = LocoPacket(
+        loco_packet_dict.get("id"),
+        loco_packet_dict.get("status_code"),
+        loco_packet_dict.get("loco_command"),
+        loco_packet_dict.get("body_type"),
+        loco_packet_dict.get("body_length"),
+        loco_packet_dict.get("body_payload"),
+    )
+
+    assert parser.loco_packet.get_packet_as_dict() == packet.get_packet_as_dict()
+
+
+def test_inject_public_key(parser, loco_encrypted_packet):
+    rsa_key_pair = get_rsa_2048_key_pair()
+
+    with open(Path("encrypted_screate_packet_with_mitm_key.raw"), "rb") as packet_raw:
+        encrypted_screate_packet_with_mitm_key = packet_raw.read()
+
+    with open(Path("screate_loco_packet.yaml"), encoding="utf-8") as packet_yaml:
+        screate_dict = yaml.load(packet_yaml)
+
+    original_public_key = screate_dict.get("body_payload").get("pi")[0].get("ek")
+    assert original_public_key
+
+    screate_packet = LocoPacket(
+        screate_dict.get("id"),
+        screate_dict.get("status_code"),
+        screate_dict.get("loco_command"),
+        screate_dict.get("body_type"),
+        screate_dict.get("body_length"),
+        screate_dict.get("body_payload"),
+    )
+
+    parser.loco_packet = screate_packet
+    assert parser.loco_packet
+
+    parser.loco_encrypted_packet = loco_encrypted_packet
+    assert parser.loco_encrypted_packet
+
+    assert parser.inject_public_key(rsa_key_pair) == (
+        original_public_key.encode(),
+        encrypted_screate_packet_with_mitm_key,
+    )
+
+
+def test_get_shared_secret(parser):
+    rsa_key_pair = get_rsa_2048_key_pair()
+
+    with open(
+        Path("setsk_loco_packet_sk_enc_with_mitm_key.yaml"), encoding="utf-8"
+    ) as packet_yaml:
+        setsk_dict = yaml.load(packet_yaml)
+
+    encrypted_shared_secret = setsk_dict.get("body_payload").get("sk")[0]
+    decrypted_shared_secret = rsa_decrypt(
+        base64.b64decode(encrypted_shared_secret), rsa_key_pair
+    )
+
+    assert decrypted_shared_secret == _SHARED_SECRET
+
+    setsk_packet = LocoPacket(
+        setsk_dict.get("id"),
+        setsk_dict.get("status_code"),
+        setsk_dict.get("loco_command"),
+        setsk_dict.get("body_type"),
+        setsk_dict.get("body_length"),
+        setsk_dict.get("body_payload"),
+    )
+
+    parser.loco_packet = setsk_packet
+    assert parser.loco_packet
+
+    assert parser.get_shared_secret(rsa_key_pair) == decrypted_shared_secret
+
+
+def test_encrypt_shared_secret(parser, loco_encrypted_packet):
+    with open(Path("encrypted_setsk_packet.raw"), "rb") as packet_raw:
+        encrypted_setsk_packet = packet_raw.read()
+
+    with open(
+        Path("setsk_loco_packet_sk_enc_with_mitm_key.yaml"), encoding="utf-8"
+    ) as packet_yaml:
+        setsk_dict = yaml.load(packet_yaml)
+
+    setsk_packet = LocoPacket(
+        setsk_dict.get("id"),
+        setsk_dict.get("status_code"),
+        setsk_dict.get("loco_command"),
+        setsk_dict.get("body_type"),
+        setsk_dict.get("body_length"),
+        setsk_dict.get("body_payload"),
+    )
+
+    parser.loco_packet = setsk_packet
+    assert parser.loco_packet
+
+    parser.loco_encrypted_packet = loco_encrypted_packet
+    assert parser.loco_encrypted_packet
+
+    assert (
+        parser.encrypt_shared_secret(_SHARED_SECRET, _KAKAOTALK_RSA_PUBLIC_KEY)
+        == encrypted_setsk_packet
+    )