CTAP2 お勉強メモ#2 - 接続(GetInfo) ref: https://qiita.com/gebo/items/e0bd197d607312dcf4fb

CBORエンコードされたauthenticatorGetInfo_Response

  // payload len 86
  00 a6 01 82 66 55 32 46 5f 56 32 68 46 49 44 4f
  5f 32 5f 30 02 81 6b 68 6d 61 63 2d 73 65 63 72
  65 74 03 50 f8 a0 11 f3 8c 0a 4d 15 80 06 17 11
  1f 9e dc 7d 04 a4 62 72 6b f5 62 75 70 f5 64 70
  6c 61 74 f4 69 63 6c 69 65 6e 74 50 69 6e f4 05
  19 04 b0 06 81 01

CBORデコードログ

A6                                     # map(6)
   01                                  # unsigned(1)
   82                                  # array(2)
      66                               # text(6)
         5532465F5632                  # "U2F_V2"
      68                               # text(8)
         4649444F5F325F30              # "FIDO_2_0"
   02                                  # unsigned(2)
   81                                  # array(1)
      6B                               # text(11)
         686D61632D736563726574        # "hmac-secret"
   03                                  # unsigned(3)
   50                                  # bytes(16)
      F8A011F38C0A4D15800617111F9EDC7D # "\xF8\xA0\x11\xF3\x8C\nM\x15\x80\x06\x17\x11\x1F\x9E\xDC}"
   04                                  # unsigned(4)
   A4                                  # map(4)
      62                               # text(2)
         726B                          # "rk"
      F5                               # primitive(21)
      62                               # text(2)
         7570                          # "up"
      F5                               # primitive(21)
      64                               # text(4)
         706C6174                      # "plat"
      F4                               # primitive(20)
      69                               # text(9)
         636C69656E7450696E            # "clientPin"
      F4                               # primitive(20)
   05                                  # unsigned(5)
   19 04B0                             # unsigned(1200)
   06                                  # unsigned(6)
   81                                  # array(1)
      01                               # unsigned(1)

CBORデコード結果

{
    1: ["U2F_V2", "FIDO_2_0"], 
    2: ["hmac-secret"], 
    3: h'F8A011F38C0A4D15800617111F9EDC7D', 
    4: {"rk": true, "up": true, "plat": false, "clientPin": false}, 
    5: 1200, 
    6: [1]
}

CTAPHID_CBOR_Packetログ

  // Platform → Authenticator 送信データ
  // 1packet(64byte)
  00 1d 00 08 90 00 01 04 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  // Platform ← Authenticator Response
  // 2 packet(64byte×2)
  // initialization packet
  00 1d 00 08 90 00 56 00 a6 01 82 66 55 32 46 5f
  56 32 68 46 49 44 4f 5f 32 5f 30 02 81 6b 68 6d
  61 63 2d 73 65 63 72 65 74 03 50 f8 a0 11 f3 8c
  0a 4d 15 80 06 17 11 1f 9e dc 7d 04 a4 62 72 6b

  // continuation packet
  00 1d 00 08 00 f5 62 75 70 f5 64 70 6c 61 74 f4
  69 63 6c 69 65 6e 74 50 69 6e f4 05 19 04 b0 06
  81 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

CTAPHID_INIT_Packetログ

  // Platform → Authenticator 送信データ
  // 1packet(64byte)
  ff ff ff ff 86 00 08 fc 8c c9 91 14 b5 3b 12 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  // Platform ← Authenticator Response
  // 1packet(64byte)
  ff ff ff ff 86 00 11 fc 8c c9 91 14 b5 3b 12 00
  1d 00 08 02 05 00 02 05 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

info.exeを実行

C:\project\libfido2\build\examples\Debug>info.exe "\\?\HID#VID_1050&PID_0120#6&1b5e4874&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}"
proto: 0x02
major: 0x05
minor: 0x00
build: 0x02
caps: 0x05 (wink, cbor, msg)
version strings: U2F_V2, FIDO_2_0
extension strings: hmac-secret
aaguid: f8a011f38c0a4d15800617111f9edc7d
options: rk, up, noplat, noclientPin
maxmsgsiz: 1200
pin protocols: 1