<a id="rend-spec-v3.txt-G"></a>

# Appendix G: Test vectors

G.1. Test vectors for hs-ntor / NTOR-WITH-EXTRA-DATA

```text
    Here is a set of test values for the hs-ntor handshake, called
    [NTOR-WITH-EXTRA-DATA] in this document.  They were generated by
    instrumenting Tor's code to dump the values for an INTRODUCE/RENDEZVOUS
    handshake, and then by running that code on a Chutney network.

    We assume an onion service with:

      KP_hs_ipd_sid = 34E171E4358E501BFF21ED907E96AC6B
                      FEF697C779D040BBAF49ACC30FC5D21F
      KP_hss_ntor   = 8E5127A40E83AABF6493E41F142B6EE3
                      604B85A3961CD7E38D247239AFF71979
      KS_hss_ntor   = A0ED5DBF94EEB2EDB3B514E4CF6ABFF6
                      022051CC5F103391F1970A3FCD15296A
      N_hs_subcred  = 0085D26A9DEBA252263BF0231AEAC59B
                      17CA11BAD8A218238AD6487CBAD68B57

    The client wants to make in INTRODUCE request.  It generates
    the following header (everything before the ENCRYPTED portion)
    of its INTRODUCE1 message:

      H = 000000000000000000000000000000000000000002002034E171E4358E501BFF
          21ED907E96AC6BFEF697C779D040BBAF49ACC30FC5D21F00

    It generates the following plaintext body to encrypt.  (This
    is the "decrypted plaintext body" from [PROCESS_INTRO2].

      P = 6BD364C12638DD5C3BE23D76ACA05B04E6CE932C0101000100200DE6130E4FCA
          C4EDDA24E21220CC3EADAE403EF6B7D11C8273AC71908DE565450300067F0000
          0113890214F823C4F8CC085C792E0AEE0283FE00AD7520B37D0320728D5DF39B
          7B7077A0118A900FF4456C382F0041300ACF9C58E51C392795EF870000000000
          0000000000000000000000000000000000000000000000000000000000000000
          000000000000000000000000000000000000000000000000000000000000

      (Note! This should in fact be padded to be longer; when these
      test vectors were generated, the target INTRODUCE1 length in C
      Tor was needlessly short.)

    The client now begins the hs-ntor handshake.  It generates
    a curve25519 keypair:

      x = 60B4D6BF5234DCF87A4E9D7487BDF3F4
          A69B6729835E825CA29089CFDDA1E341
      X = BF04348B46D09AED726F1D66C618FDEA
          1DE58E8CB8B89738D7356A0C59111D5D

    Then it calculates:

      ENC_KEY = 9B8917BA3D05F3130DACCE5300C3DC27
                F6D012912F1C733036F822D0ED238706
      MAC_KEY = FC4058DA59D4DF61E7B40985D122F502
                FD59336BC21C30CAF5E7F0D4A2C38FD5

    With these, it encrypts the plaintext body P with ENC_KEY, getting
    an encrypted value C.  It computes MAC(MAC_KEY, H | X | C),
    getting a MAC value M.  It then assembles the final INTRODUCE1
    body as H | X | C | M:

      000000000000000000000000000000000000000002002034E171E4358E501BFF
      21ED907E96AC6BFEF697C779D040BBAF49ACC30FC5D21F00BF04348B46D09AED
      726F1D66C618FDEA1DE58E8CB8B89738D7356A0C59111D5DADBECCCB38E37830
      4DCC179D3D9E437B452AF5702CED2CCFEC085BC02C4C175FA446525C1B9D5530
      563C362FDFFB802DAB8CD9EBC7A5EE17DA62E37DEEB0EB187FBB48C63298B0E8
      3F391B7566F42ADC97C46BA7588278273A44CE96BC68FFDAE31EF5F0913B9A9C
      7E0F173DBC0BDDCD4ACB4C4600980A7DDD9EAEC6E7F3FA3FC37CD95E5B8BFB3E
      35717012B78B4930569F895CB349A07538E42309C993223AEA77EF8AEA64F25D
      DEE97DA623F1AEC0A47F150002150455845C385E5606E41A9A199E7111D54EF2
      D1A51B7554D8B3692D85AC587FB9E69DF990EFB776D8
```

Later the service receives that body in an INTRODUCE2 message.  It
processes it according to the hs-ntor handshake, and recovers
the client's plaintext P.  To continue the hs-ntor handshake,
the service chooses a curve25519 keypair:

```text
      y = 68CB5188CA0CD7924250404FAB54EE13
          92D3D2B9C049A2E446513875952F8F55
      Y = 8FBE0DB4D4A9C7FF46701E3E0EE7FD05
          CD28BE4F302460ADDEEC9E93354EE700

   From this and the client's input, it computes:

      AUTH_INPUT_MAC = 4A92E8437B8424D5E5EC279245D5C72B
                       25A0327ACF6DAF902079FCB643D8B208
      NTOR_KEY_SEED  = 4D0C72FE8AFF35559D95ECC18EB5A368
                       83402B28CDFD48C8A530A5A3D7D578DB
```

The service sends back Y | AUTH_INPUT_MAC in its RENDEZVOUS1 message
body.  From these, the client finishes the handshake, validates
AUTH_INPUT_MAC, and computes the same NTOR_KEY_SEED.

Now that both parties have the same NTOR_KEY_SEED, they can derive
the shared key material they will use for their circuit.
