#
#                 Ethereum P2P
#              (c) Copyright 2018
#       Status Research & Development GmbH
#
#    See the file "LICENSE", included in this
#    distribution, for details about the copyright.
#

{.used.}

import
  unittest2,
  nimcrypto/[utils, keccak],
  ../../eth/keys, ../../eth/p2p/auth

# This was generated by `print` actual auth message generated by
# https://github.com/ethereum/py-evm/blob/master/tests/p2p/test_auth.py
const pyevmAuth = """
  22034ad2e7545e2b0bf02ecb1e40db478dfbbf7aeecc834aec2523eb2b7e74ee
  77ba40c70a83bfe9f2ab91f0131546dcf92c3ee8282d9907fee093017fd0302d
  0034fdb5419558137e0d44cd13d319afe5629eeccb47fd9dfe55cc6089426e46
  cc762dd8a0636e07a54b31169eba0c7a20a1ac1ef68596f1f283b5c676bae406
  4abfcce24799d09f67e392632d3ffdc12e3d6430dcb0ea19c318343ffa7aae74
  d4cd26fecb93657d1cd9e9eaf4f8be720b56dd1d39f190c4e1c6b7ec66f077bb
  1100"""

# This data comes from https://gist.github.com/fjl/3a78780d17c755d22df2
const data = [
  ("initiator_private_key",
   "5e173f6ac3c669587538e7727cf19b782a4f2fda07c1eaa662c593e5e85e3051"),
  ("receiver_private_key",
   "c45f950382d542169ea207959ee0220ec1491755abe405cd7498d6b16adb6df8"),
  ("initiator_ephemeral_private_key",
   "19c2185f4f40634926ebed3af09070ca9e029f2edd5fae6253074896205f5f6c"),
  ("receiver_ephemeral_private_key",
   "d25688cf0ab10afa1a0e2dba7853ed5f1e5bf1c631757ed4e103b593ff3f5620"),
  ("auth_plaintext",
   """884c36f7ae6b406637c1f61b2f57e1d2cab813d24c6559aaf843c3f48962f32f
      46662c066d39669b7b2e3ba14781477417600e7728399278b1b5d801a519aa57
      0034fdb5419558137e0d44cd13d319afe5629eeccb47fd9dfe55cc6089426e46
      cc762dd8a0636e07a54b31169eba0c7a20a1ac1ef68596f1f283b5c676bae406
      4abfcce24799d09f67e392632d3ffdc12e3d6430dcb0ea19c318343ffa7aae74
      d4cd26fecb93657d1cd9e9eaf4f8be720b56dd1d39f190c4e1c6b7ec66f077bb
      1100"""),
  ("authresp_plaintext",
   """802b052f8b066640bba94a4fc39d63815c377fced6fcb84d27f791c9921ddf3e
      9bf0108e298f490812847109cbd778fae393e80323fd643209841a3b7f110397
      f37ec61d84cea03dcc5e8385db93248584e8af4b4d1c832d8c7453c0089687a7
      00"""),
  ("auth_ciphertext",
   """04a0274c5951e32132e7f088c9bdfdc76c9d91f0dc6078e848f8e3361193dbdc
      43b94351ea3d89e4ff33ddcefbc80070498824857f499656c4f79bbd97b6c51a
      514251d69fd1785ef8764bd1d262a883f780964cce6a14ff206daf1206aa073a
      2d35ce2697ebf3514225bef186631b2fd2316a4b7bcdefec8d75a1025ba2c540
      4a34e7795e1dd4bc01c6113ece07b0df13b69d3ba654a36e35e69ff9d482d88d
      2f0228e7d96fe11dccbb465a1831c7d4ad3a026924b182fc2bdfe016a6944312
      021da5cc459713b13b86a686cf34d6fe6615020e4acf26bf0d5b7579ba813e77
      23eb95b3cef9942f01a58bd61baee7c9bdd438956b426a4ffe238e61746a8c93
      d5e10680617c82e48d706ac4953f5e1c4c4f7d013c87d34a06626f498f34576d
      c017fdd3d581e83cfd26cf125b6d2bda1f1d56"""),
  ("authresp_ciphertext",
   """049934a7b2d7f9af8fd9db941d9da281ac9381b5740e1f64f7092f3588d4f87f
      5ce55191a6653e5e80c1c5dd538169aa123e70dc6ffc5af1827e546c0e958e42
      dad355bcc1fcb9cdf2cf47ff524d2ad98cbf275e661bf4cf00960e74b5956b79
      9771334f426df007350b46049adb21a6e78ab1408d5e6ccde6fb5e69f0f4c92b
      b9c725c02f99fa72b9cdc8dd53cff089e0e73317f61cc5abf6152513cb7d833f
      09d2851603919bf0fbe44d79a09245c6e8338eb502083dc84b846f2fee1cc310
      d2cc8b1b9334728f97220bb799376233e113"""),
  ("ecdhe_shared_secret",
   "e3f407f83fc012470c26a93fdff534100f2c6f736439ce0ca90e9914f7d1c381"),
  ("initiator_nonce",
   "cd26fecb93657d1cd9e9eaf4f8be720b56dd1d39f190c4e1c6b7ec66f077bb11"),
  ("receiver_nonce",
   "f37ec61d84cea03dcc5e8385db93248584e8af4b4d1c832d8c7453c0089687a7"),
  ("aes_secret",
   "c0458fa97a5230830e05f4f20b7c755c1d4e54b1ce5cf43260bb191eef4e418d"),
  ("mac_secret",
   "48c938884d5067a1598272fcddaa4b833cd5e7d92e8228c0ecdfabbe68aef7f1"),
  ("token",
   "3f9ec2592d1554852b1f54d228f042ed0a9310ea86d038dc2b401ba8cd7fdac4"),
  ("initial_egress_MAC",
   "09771e93b1a6109e97074cbe2d2b0cf3d3878efafe68f53c41bb60c0ec49097e"),
  ("initial_ingress_MAC",
   "75823d96e23136c89666ee025fb21a432be906512b3dd4a3049e898adb433847"),
  ("initiator_hello_packet",
   """6ef23fcf1cec7312df623f9ae701e63b550cdb8517fefd8dd398fc2acd1d935e
      6e0434a2b96769078477637347b7b01924fff9ff1c06df2f804df3b0402bbb9f
      87365b3c6856b45e1e2b6470986813c3816a71bff9d69dd297a5dbd935ab578f
      6e5d7e93e4506a44f307c332d95e8a4b102585fd8ef9fc9e3e055537a5cec2e9"""),
  ("receiver_hello_packet",
   """6ef23fcf1cec7312df623f9ae701e63be36a1cdd1b19179146019984f3625d4a
      6e0434a2b96769050577657247b7b02bc6c314470eca7e3ef650b98c83e9d7dd
      4830b3f718ff562349aead2530a8d28a8484604f92e5fced2c6183f304344ab0
      e7c301a0c05559f4c25db65e36820b4b909a226171a60ac6cb7beea09376d6d8""")
]

# These test vectors were copied from EIP8 specification
# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-8.md
const eip8data = [
  ("initiator_private_key",
   "49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee"),
  ("receiver_private_key",
   "b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291"),
  ("initiator_ephemeral_private_key",
   "869d6ecf5211f1cc60418a13b9d870b22959d0c16f02bec714c960dd2298a32d"),
  ("receiver_ephemeral_private_key",
   "e238eb8e04fee6511ab04c6dd3c89ce097b11f25d584863ac2b6d5b35b1847e4"),
  ("initiator_nonce",
   "7e968bba13b6c50e2c4cd7f241cc0d64d1ac25c7f5952df231ac6a2bda8ee5d6"),
  ("receiver_nonce",
   "559aead08264d5795d3909718cdd05abd49572e84fe55590eef31a88a08fdffd"),
  ("auth_ciphertext_v4",
   """048ca79ad18e4b0659fab4853fe5bc58eb83992980f4c9cc147d2aa31532efd29
      a3d3dc6a3d89eaf913150cfc777ce0ce4af2758bf4810235f6e6ceccfee1acc6b
      22c005e9e3a49d6448610a58e98744ba3ac0399e82692d67c1f58849050b3024e
      21a52c9d3b01d871ff5f210817912773e610443a9ef142e91cdba0bd77b5fdf07
      69b05671fc35f83d83e4d3b0b000c6b2a1b1bba89e0fc51bf4e460df3105c444f
      14be226458940d6061c296350937ffd5e3acaceeaaefd3c6f74be8e23e0f45163
      cc7ebd76220f0128410fd05250273156d548a414444ae2f7dea4dfca2d43c057a
      db701a715bf59f6fb66b2d1d20f2c703f851cbf5ac47396d9ca65b6260bd141ac
      4d53e2de585a73d1750780db4c9ee4cd4d225173a4592ee77e2bd94d0be3691f3
      b406f9bba9b591fc63facc016bfa8"""),
  ("auth_ciphertext_eip8",
   """01b304ab7578555167be8154d5cc456f567d5ba302662433674222360f08d5f15
      34499d3678b513b0fca474f3a514b18e75683032eb63fccb16c156dc6eb2c0b15
      93f0d84ac74f6e475f1b8d56116b849634a8c458705bf83a626ea0384d4d7341a
      ae591fae42ce6bd5c850bfe0b999a694a49bbbaf3ef6cda61110601d3b4c02ab6
      c30437257a6e0117792631a4b47c1d52fc0f8f89caadeb7d02770bf999cc147d2
      df3b62e1ffb2c9d8c125a3984865356266bca11ce7d3a688663a51d82defaa8aa
      d69da39ab6d5470e81ec5f2a7a47fb865ff7cca21516f9299a07b1bc63ba56c7a
      1a892112841ca44b6e0034dee70c9adabc15d76a54f443593fafdc3b27af80597
      03f88928e199cb122362a4b35f62386da7caad09c001edaeb5f8a06d2b26fb6cb
      93c52a9fca51853b68193916982358fe1e5369e249875bb8d0d0ec36f917bc5e1
      eafd5896d46bd61ff23f1a863a8a8dcd54c7b109b771c8e61ec9c8908c733c026
      3440e2aa067241aaa433f0bb053c7b31a838504b148f570c0ad62837129e54767
      8c5190341e4f1693956c3bf7678318e2d5b5340c9e488eefea198576344afbdf6
      6db5f51204a6961a63ce072c8926c"""),
  ("auth_ciphertext_eip8_3f",
   """01b8044c6c312173685d1edd268aa95e1d495474c6959bcdd10067ba4c9013df9
      e40ff45f5bfd6f72471f93a91b493f8e00abc4b80f682973de715d77ba3a005a2
      42eb859f9a211d93a347fa64b597bf280a6b88e26299cf263b01b8dfdb7122784
      64fd1c25840b995e84d367d743f66c0e54a586725b7bbf12acca27170ae3283c1
      073adda4b6d79f27656993aefccf16e0d0409fe07db2dc398a1b7e8ee93bcd181
      485fd332f381d6a050fba4c7641a5112ac1b0b61168d20f01b479e19adf7fdbfa
      0905f63352bfc7e23cf3357657455119d879c78d3cf8c8c06375f3f7d4861aa02
      a122467e069acaf513025ff196641f6d2810ce493f51bee9c966b15c504350535
      0392b57645385a18c78f14669cc4d960446c17571b7c5d725021babbcd786957f
      3d17089c084907bda22c2b2675b4378b114c601d858802a55345a15116bc61da4
      193996187ed70d16730e9ae6b3bb8787ebcaea1871d850997ddc08b4f4ea668fb
      f37407ac044b55be0908ecb94d4ed172ece66fd31bfdadf2b97a8bc690163ee11
      f5b575a4b44e36e2bfb2f0fce91676fd64c7773bac6a003f481fddd0bae0a1f31
      aa27504e2a533af4cef3b623f4791b2cca6d490"""),
  ("authack_ciphertext_v4",
   """049f8abcfa9c0dc65b982e98af921bc0ba6e4243169348a236abe9df5f93aa69d
      99cadddaa387662b0ff2c08e9006d5a11a278b1b3331e5aaabf0a32f01281b6f4
      ede0e09a2d5f585b26513cb794d9635a57563921c04a9090b4f14ee42be1a5461
      049af4ea7a7f49bf4c97a352d39c8d02ee4acc416388c1c66cec761d2bc1c72da
      6ba143477f049c9d2dde846c252c111b904f630ac98e51609b3b1f58168ddca65
      05b7196532e5f85b259a20c45e1979491683fee108e9660edbf38f3add489ae73
      e3dda2c71bd1497113d5c755e942d1"""),
  ("authack_ciphertext_eip8",
   """01ea0451958701280a56482929d3b0757da8f7fbe5286784beead59d95089c217
      c9b917788989470b0e330cc6e4fb383c0340ed85fab836ec9fb8a49672712aeab
      bdfd1e837c1ff4cace34311cd7f4de05d59279e3524ab26ef753a0095637ac88f
      2b499b9914b5f64e143eae548a1066e14cd2f4bd7f814c4652f11b254f8a2d019
      1e2f5546fae6055694aed14d906df79ad3b407d94692694e259191cde171ad542
      fc588fa2b7333313d82a9f887332f1dfc36cea03f831cb9a23fea05b33deb999e
      85489e645f6aab1872475d488d7bd6c7c120caf28dbfc5d6833888155ed69d34d
      bdc39c1f299be1057810f34fbe754d021bfca14dc989753d61c413d261934e1a9
      c67ee060a25eefb54e81a4d14baff922180c395d3f998d70f46f6b58306f96962
      7ae364497e73fc27f6d17ae45a413d322cb8814276be6ddd13b885b201b943213
      656cde498fa0e9ddc8e0b8f8a53824fbd82254f3e2c17e8eaea009c38b4aa0a3f
      306e8797db43c25d68e86f262e564086f59a2fc60511c42abfb3057c247a8a8fe
      4fb3ccbadde17514b7ac8000cdb6a912778426260c47f38919a91f25f4b5ffb45
      5d6aaaf150f7e5529c100ce62d6d92826a71778d809bdf60232ae21ce8a437eca
      8223f45ac37f6487452ce626f549b3b5fdee26afd2072e4bc75833c2464c80524
      6155289f4"""),
  ("authack_ciphertext_eip8_3f",
   """01f004076e58aae772bb101ab1a8e64e01ee96e64857ce82b1113817c6cdd52c0
      9d26f7b90981cd7ae835aeac72e1573b8a0225dd56d157a010846d888dac7464b
      af53f2ad4e3d584531fa203658fab03a06c9fd5e35737e417bc28c1cbf5e5dfc6
      66de7090f69c3b29754725f84f75382891c561040ea1ddc0d8f381ed1b9d0d4ad
      2a0ec021421d847820d6fa0ba66eaf58175f1b235e851c7e2124069fbc202888d
      db3ac4d56bcbd1b9b7eab59e78f2e2d400905050f4a92dec1c4bdf797b3fc9b2f
      8e84a482f3d800386186712dae00d5c386ec9387a5e9c9a1aca5a573ca91082c7
      d68421f388e79127a5177d4f8590237364fd348c9611fa39f78dcdceee3f390f0
      7991b7b47e1daa3ebcb6ccc9607811cb17ce51f1c8c2c5098dbdd28fca547b3f5
      8c01a424ac05f869f49c6a34672ea2cbbc558428aa1fe48bbfd61158b1b735a65
      d99f21e70dbc020bfdface9f724a0d1fb5895db971cc81aa7608baa0920abb0a5
      65c9c436e2fd13323428296c86385f2384e408a31e104670df0791d93e743a3a5
      194ee6b076fb6323ca593011b7348c16cf58f66b9633906ba54a2ee803187344b
      394f75dd2e663a57b956cb830dd7a908d4f39a2336a61ef9fda549180d4ccde21
      514d117b6c6fd07a9102b5efe710a32af4eeacae2cb3b1dec035b9593b48b9d3c
      a4c13d245d5f04169b0b1"""),
  ("auth2ack2_aes_secret",
   "80e8632c05fed6fc2a13b0f8d31a3cf645366239170ea067065aba8e28bac487"),
  ("auth2ack2_mac_secret",
   "2ea74ec5dae199227dff1af715362700e989d889d7a493cb0639691efb8e5f98"),
  ("auth2ack2_ingress_message", "foo"),
  ("auth2ack2_ingress_mac",
   "0c7ec6340062cc46f5e9f1e3cf86f8c8c403c5a0964f5df0ebd34a75ddc86db5")
]

let rng = newRng()

proc testValue(s: string): string =
  for item in data:
    if item[0] == s:
      result = item[1]
      break

proc testE8Value(s: string): string =
  for item in eip8data:
    if item[0] == s:
      result = item[1]
      break

suite "Ethereum P2P handshake test suite":
  block:
    proc newTestHandshake(flags: set[HandshakeFlag]): Handshake =
      if Initiator in flags:
        let pk = PrivateKey.fromHex(testValue("initiator_private_key"))[]
        result = Handshake.init(rng[], pk.toKeyPair(), flags)

        let epki = testValue("initiator_ephemeral_private_key")
        result.ephemeral = PrivateKey.fromHex(epki)[].toKeyPair()
        let nonce = fromHex(stripSpaces(testValue("initiator_nonce")))
        result.initiatorNonce[0..^1] = nonce[0..^1]
      elif Responder in flags:
        let pk = PrivateKey.fromHex(testValue("receiver_private_key"))[]
        result = Handshake.init(rng[], pk.toKeyPair(), flags)
        let epkr = testValue("receiver_ephemeral_private_key")
        result.ephemeral = PrivateKey.fromHex(epkr)[].toKeyPair()
        let nonce = fromHex(stripSpaces(testValue("receiver_nonce")))
        result.responderNonce[0..^1] = nonce[0..^1]

    test "Create plain auth message":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = newSeq[byte](initiator.authSize(false))
      var k0 = 0
      initiator.authMessage(
        rng[], responder.host.pubkey, m0, k0, 0, false).expect("auth success")
      var expect1 = fromHex(stripSpaces(testValue("auth_plaintext")))
      var expect2 = fromHex(stripSpaces(pyevmAuth))
      check:
        m0[65..^1] == expect1[65..^1]
        m0[0..^1] == expect2[0..^1]

    test "Auth message decoding":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = newSeq[byte](initiator.authSize())
      var k0 = 0
      let remoteEPubkey0 = initiator.ephemeral.pubkey
      let remoteHPubkey0 = initiator.host.pubkey

      initiator.authMessage(
        rng[], responder.host.pubkey, m0, k0).expect("auth success")
      responder.decodeAuthMessage(m0).expect("decode success")
      check:
        responder.initiatorNonce[0..^1] == initiator.initiatorNonce[0..^1]
        responder.remoteEPubkey == remoteEPubkey0
        responder.remoteHPubkey == remoteHPubkey0

    test "ACK message expectation":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = newSeq[byte](initiator.authSize())
      var m1 = newSeq[byte](responder.ackSize(false))
      var k0 = 0
      var k1 = 0
      var expect0 = fromHex(stripSpaces(testValue("authresp_plaintext")))
      initiator.authMessage(
        rng[], responder.host.pubkey, m0, k0).expect("auth success")
      responder.decodeAuthMessage(m0).expect("decode success")
      responder.ackMessage(rng[], m1, k1, 0, false).expect("ack success")
      check:
        m1 == expect0
        responder.initiatorNonce == initiator.initiatorNonce

    test "ACK message decoding":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = newSeq[byte](initiator.authSize())
      var m1 = newSeq[byte](responder.ackSize())
      var k0 = 0
      var k1 = 0

      initiator.authMessage(
        rng[], responder.host.pubkey, m0, k0).expect("auth success")
      responder.decodeAuthMessage(m0).expect("decode success")
      responder.ackMessage(rng[], m1, k1).expect("ack success")
      initiator.decodeAckMessage(m1).expect("decode success")
      let remoteEPubkey0 = responder.ephemeral.pubkey
      let remoteHPubkey0 = responder.host.pubkey
      check:
        initiator.remoteEPubkey == remoteEPubkey0
        initiator.remoteHPubkey == remoteHPubkey0
        initiator.responderNonce == responder.responderNonce

    test "Check derived secrets":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var authm = fromHex(stripSpaces(testValue("auth_ciphertext")))
      var ackm = fromHex(stripSpaces(testValue("authresp_ciphertext")))
      var taes = fromHex(stripSpaces(testValue("aes_secret")))
      var tmac = fromHex(stripSpaces(testValue("mac_secret")))
      var temac = fromHex(stripSpaces(testValue("initial_egress_MAC")))
      var timac = fromHex(stripSpaces(testValue("initial_ingress_MAC")))

      responder.decodeAuthMessage(authm).expect("decode success")
      initiator.decodeAckMessage(ackm).expect("ack success")
      var csecInitiator = initiator.getSecrets(authm, ackm)
      var csecResponder = responder.getSecrets(authm, ackm)
      check:
        csecInitiator.aesKey == csecResponder.aesKey
        csecInitiator.macKey == csecResponder.macKey
        taes[0..^1] == csecInitiator.aesKey[0..^1]
        tmac[0..^1] == csecInitiator.macKey[0..^1]
      let iemac = csecInitiator.egressMac.finish()
      let iimac = csecInitiator.ingressMac.finish()
      let remac = csecResponder.egressMac.finish()
      let rimac = csecResponder.ingressMac.finish()
      check:
        iemac.data[0..^1] == temac[0..^1]
        iimac.data[0..^1] == timac[0..^1]
        remac.data[0..^1] == timac[0..^1]
        rimac.data[0..^1] == temac[0..^1]

  block:
    proc newTestHandshake(flags: set[HandshakeFlag]): Handshake =
      if Initiator in flags:
        let pk = PrivateKey.fromHex(testE8Value("initiator_private_key"))[]
        result = Handshake.init(rng[], pk.toKeyPair(), flags)

        let esec = testE8Value("initiator_ephemeral_private_key")
        result.ephemeral = PrivateKey.fromHex(esec)[].toKeyPair()
        let nonce = fromHex(stripSpaces(testE8Value("initiator_nonce")))
        result.initiatorNonce[0..^1] = nonce[0..^1]
      elif Responder in flags:
        let pk = PrivateKey.fromHex(testE8Value("receiver_private_key"))[]
        result = Handshake.init(rng[], pk.toKeyPair(), flags)

        let esec = testE8Value("receiver_ephemeral_private_key")
        result.ephemeral = PrivateKey.fromHex(esec)[].toKeyPair()
        let nonce = fromHex(stripSpaces(testE8Value("receiver_nonce")))
        result.responderNonce[0..^1] = nonce[0..^1]

    test "AUTH/ACK v4 test vectors": # auth/ack v4
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = fromHex(stripSpaces(testE8Value("auth_ciphertext_v4")))
      responder.decodeAuthMessage(m0).expect("decode success")
      check:
        responder.initiatorNonce[0..^1] == initiator.initiatorNonce[0..^1]
      let remoteEPubkey0 = initiator.ephemeral.pubkey
      let remoteHPubkey0 = initiator.host.pubkey
      check:
        responder.remoteEPubkey == remoteEPubkey0
        responder.remoteHPubkey == remoteHPubkey0
      var m1 = fromHex(stripSpaces(testE8Value("authack_ciphertext_v4")))
      initiator.decodeAckMessage(m1).expect("decode success")
      let remoteEPubkey1 = responder.ephemeral.pubkey
      check:
        initiator.remoteEPubkey == remoteEPubkey1
        initiator.responderNonce[0..^1] == responder.responderNonce[0..^1]

    test "AUTH/ACK EIP-8 test vectors":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = fromHex(stripSpaces(testE8Value("auth_ciphertext_eip8")))
      responder.decodeAuthMessage(m0).expect("decode success")
      check:
        responder.initiatorNonce[0..^1] == initiator.initiatorNonce[0..^1]
      let remoteEPubkey0 = initiator.ephemeral.pubkey
      check responder.remoteEPubkey == remoteEPubkey0
      let remoteHPubkey0 = initiator.host.pubkey
      check responder.remoteHPubkey == remoteHPubkey0
      var m1 = fromHex(stripSpaces(testE8Value("authack_ciphertext_eip8")))
      initiator.decodeAckMessage(m1).expect("decode success")
      let remoteEPubkey1 = responder.ephemeral.pubkey
      check:
        initiator.remoteEPubkey == remoteEPubkey1
        initiator.responderNonce[0..^1] == responder.responderNonce[0..^1]
      var taes = fromHex(stripSpaces(testE8Value("auth2ack2_aes_secret")))
      var tmac = fromHex(stripSpaces(testE8Value("auth2ack2_mac_secret")))

      var csecInitiator = initiator.getSecrets(m0, m1)
      var csecResponder = responder.getSecrets(m0, m1)
      check:
        int(initiator.version) == 4
        int(responder.version) == 4
        csecInitiator.aesKey == csecResponder.aesKey
        csecInitiator.macKey == csecResponder.macKey
        taes[0..^1] == csecInitiator.aesKey[0..^1]
        tmac[0..^1] == csecInitiator.macKey[0..^1]

      var ingressMac = csecResponder.ingressMac
      ingressMac.update(testE8Value("auth2ack2_ingress_message"))
      check ingressMac.finish().data.toHex(true) ==
        testE8Value("auth2ack2_ingress_mac")

    test "AUTH/ACK EIP-8 with additional fields test vectors":
      var initiator = newTestHandshake({Initiator})
      var responder = newTestHandshake({Responder})
      var m0 = fromHex(stripSpaces(testE8Value("auth_ciphertext_eip8_3f")))
      responder.decodeAuthMessage(m0).expect("decode success")
      check:
        responder.initiatorNonce[0..^1] == initiator.initiatorNonce[0..^1]
      let remoteEPubkey0 = initiator.ephemeral.pubkey
      let remoteHPubkey0 = initiator.host.pubkey
      check:
        responder.remoteEPubkey == remoteEPubkey0
        responder.remoteHPubkey == remoteHPubkey0
      var m1 = fromHex(stripSpaces(testE8Value("authack_ciphertext_eip8_3f")))
      initiator.decodeAckMessage(m1).expect("decode success")
      let remoteEPubkey1 = responder.ephemeral.pubkey
      check:
        int(initiator.version) == 57
        int(responder.version) == 56
        initiator.remoteEPubkey == remoteEPubkey1
        initiator.responderNonce[0..^1] == responder.responderNonce[0..^1]

    test "100 AUTH/ACK EIP-8 handshakes":
      for i in 1..100:
        var initiator = newTestHandshake({Initiator, EIP8})
        var responder = newTestHandshake({Responder})
        var m0 = newSeq[byte](initiator.authSize())
        var k0 = 0
        var k1 = 0
        initiator.authMessage(
          rng[], responder.host.pubkey, m0, k0).expect("auth success")
        m0.setLen(k0)
        responder.decodeAuthMessage(m0).expect("decode success")
        check (EIP8 in responder.flags) == true
        var m1 = newSeq[byte](responder.ackSize())
        responder.ackMessage(rng[], m1, k1).expect("ack success")
        m1.setLen(k1)
        initiator.decodeAckMessage(m1).expect("decode success")
        var csecInitiator = initiator.getSecrets(m0, m1)
        var csecResponder = responder.getSecrets(m0, m1)
        check:
          csecInitiator.aesKey == csecResponder.aesKey
          csecInitiator.macKey == csecResponder.macKey

    test "100 AUTH/ACK V4 handshakes":
      for i in 1..100:
        var initiator = newTestHandshake({Initiator})
        var responder = newTestHandshake({Responder})
        var m0 = newSeq[byte](initiator.authSize())
        var k0 = 0
        var k1 = 0
        initiator.authMessage(
          rng[], responder.host.pubkey, m0, k0).expect("auth success")
        m0.setLen(k0)
        responder.decodeAuthMessage(m0).expect("auth success")
        var m1 = newSeq[byte](responder.ackSize())
        responder.ackMessage(rng[], m1, k1).expect("ack success")
        m1.setLen(k1)
        initiator.decodeAckMessage(m1).expect("ack success")

        var csecInitiator = initiator.getSecrets(m0, m1)
        var csecResponder = responder.getSecrets(m0, m1)
        check:
          csecInitiator.aesKey == csecResponder.aesKey
          csecInitiator.macKey == csecResponder.macKey

    test "Invalid AuthMessage - Minimum input size":
      var responder = newTestHandshake({Responder})

      # 1 byte short on minimum AuthMessage size
      var m = newSeq[byte](AuthMessageEIP8Length - 1)

      let res = responder.decodeAuthMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError

    test "Invalid AuthMessage - Minimum size prefix":
      var responder = newTestHandshake({Responder})

      # Minimum size for EIP8 AuthMessage
      var m = newSeq[byte](AuthMessageEIP8Length)
      # size prefix size of 281, 1 byte short
      m[0] = 1
      m[1] = 25

      let res = responder.decodeAuthMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError

    test "Invalid AuthMessage - Size prefix bigger than input":
      var responder = newTestHandshake({Responder})

      # Minimum size for EIP8 AuthMessage
      var m = newSeq[byte](AuthMessageEIP8Length)
      # size prefix size of 283, 1 byte too many
      m[0] = 1
      m[1] = 27

      let res = responder.decodeAuthMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError

    test "Invalid AckMessage - Minimum input size":
      var initiator = newTestHandshake({Initiator, EIP8})

      # 1 byte short on minimum size
      let m = newSeq[byte](AckMessageV4Length - 1)

      let res = initiator.decodeAckMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError

    test "Invalid AckMessage - Minimum size prefix":
      var initiator = newTestHandshake({Initiator, EIP8})

      # Minimum size for EIP8 AckMessage
      var m = newSeq[byte](AckMessageEIP8Length)
      # size prefix size of 214, 1 byte short
      m[0] = 0
      m[1] = 214

      let res = initiator.decodeAckMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError

    test "Invalid AckMessage - Size prefix bigger than input":
      var initiator = newTestHandshake({Initiator, EIP8})

      # Minimum size for EIP8 AckMessage
      var m = newSeq[byte](AckMessageEIP8Length)
      # size prefix size of 216, 1 byte too many
      m[0] = 0
      m[1] = 216

      let res = initiator.decodeAckMessage(m)
      check:
        res.isErr()
        res.error == AuthError.IncompleteError