let encode = B32.encode
let decode s = B32.decode s |> Result.get_ok

let round_trip s =
  let s' = s |> encode |> decode in
  match s' = s with
  | false -> Fmt.failwith "b32 round trip failure: @\nin :`%S`@\nout:`%S`" s' s
  | true -> ()

let () =
  let s = String.init 0xff Char.chr in
  round_trip s;
  let s_l = List.init 0x0f (fun i -> String.init i Char.chr) in
  List.iter round_trip s_l; ()

(* test vectors from:
   https://git.gnunet.org/gnunet/gnunet/file/src/cli/util/crypto-test-vectors.json.html *)

let () =
  (* hash *)
  let input = "91JPRV3F5GG4EKJNDSJQ8" in
  let expected =
    "D0R24RZ1TPASVQ2NY56CT8AJDYZE9ZGDB0GVZ05E9D4YGZQW2RC5YFPQ0Q86EPW836DY7VYQTNFFJT3ZR2K508F4JVS5JNJKYN2MMFR"
  in
  let output =
    input |> decode |> Hash.H64.hash |> Hash.H64.to_octets |> encode
  in
  assert (output = expected);

  ()

let () =
  (* eddsa_key_derivation *)
  let pub = "3M9KK1WSNM1RTY5P72HKFA264V4B7MVHVJ08Y90CV06DYHV8XPP0" in
  let priv = "8QC2VNF8443S5KPNKMB4XMV58BTHWAKZ7SVW5WG3KRB37567XS90" in
  let pub' =
    let open Crypto in
    priv
    |> decode
    |> EddsaPrivateKey.of_octets
    |> Result.get_ok
    |> EddsaPrivateKey.pub_of_priv
    |> EddsaPublicKey.to_octets
    |> encode
  in
  assert (pub = pub');

  ()

let () =
  (* eddsa_signing *)
  let priv = "5077XJR9AMH4T97ACKFBVBJD0KFENHPV66B2Y1JBSKXBJKNZJ4E0" in
  let pub = "6E2F03JJ8AEDANTTZZ4SBZDFEEZSF8A9DVGTS6VFBCVZQYQ46RRG" in
  let data = "00000300000000000000" in
  let sig_ =
    "XCNJGJ96WPDH60YVMH6C74NGQSGJE3BC1TYMGX6BHY5DMZZZKTB373QTXJ507K5EBSG9YS2EYKHCX3ATRQ6P5MY9MXC4ZB1XSZ2X23G"
  in
  let open Crypto in
  let msg = decode data in
  let eddsa_priv =
    priv |> decode |> EddsaPrivateKey.of_octets |> Result.get_ok
  in
  let sig_' =
    EddsaSignature.sign ~key:eddsa_priv msg
    |> EddsaSignature.to_octets
    |> encode
  in
  assert (sig_ = sig_');
  let eddsa_pub = pub |> decode |> EddsaPublicKey.of_octets |> Result.get_ok in
  let eddsa_sig = sig_ |> decode |> EddsaSignature.of_octets |> Result.get_ok in
  let () =
    EddsaSignature.verify ~key:eddsa_pub eddsa_sig ~msg |> Result.get_ok
  in

  ()

let () =
  (* kdf *)
  let salt = "94KPT83PCNS7J83KC5P78Y8" in
  let ikm = "94KPT83MD1JJ0WV5CDS6AX10D5Q70XBM41NPAY90DNGQ8SBJD5GPR" in
  let ctx =
    "94KPT83141HPYVKMCNW78833D1TPWTSC41GPRWVF41NPWVVQDRG62WS04XMPWSKF4WG6JVH0EHM6A82J8S1G"
  in
  let out_len = 64 in
  let out =
    "GTMR4QT05Z9WF5HKVG0WK9RPXGHSMHJNW377G9GJXCA8B0FEKPF4D27RJMSJZYWSQNTBJ5EYVV7ZW18B48Z0JVJJ80RHB706Y96Q358"
  in

  let xts = salt |> decode in
  let ikm = ikm |> decode in
  let ctx = ctx |> decode in
  let okm = Crypto.FDH_RSA.Kdf.kdf ~xts ~ikm ~ctx ~len:out_len in
  let okm = okm |> encode in
  assert (okm = out);

  ()

let () =
  (* rsa blinding *)
  (* rsa_private_key data is given in gcrypt sexpr format.. *)
  let message_hash =
    "XKQMJ4CNTXBFE1V2WR6JS063J7PZQE4XMB5JH3RS5X0THQ1JQSQ69Y7KDBC9TYRJEZH48MEPY2SF4QHQ4VHXC0YQX5935MQEGP0AX6R"
  in
  let rsa_public_key =
    "040000YRN1NVJ68RS6RJF52PGRCQG19ZKWQPSTJX2G7ZDCKSZFE2VW3HHA81YF5C639JHJF5TX8YTEE2FW2WQCG1PTKNBSPPJEJGA032CN3E8QZ27VWY0K6JFT8ZSYWRH2SKDMXW56A4QKY46JJBWJ6T0ZRVBW6S1HTHXVE2RW8MXRW5T801077MDY13N5F8Z1JZVKBJ06TK3S0YPEDBXK0VEHRHEQJ5X5XYKR4KQTFAZNBMKXY8836VCHBXTK4YNX6AJ1CK29SMJH3Z3QRM16A2TNQGFR0HSMV446BF7FMT2E379ZAT5ST4G3BM2NWZYW545S2SW5MG5S6M88XZZ7SKFD48YVXNZ205GGSEYJPVBMR76WG4ZG30WBCPC1N54XE12RMAG81D8C09WG22PKGGDHYXX68N04002"
  in
  let blinding_key_secret =
    "3SWF49XZPHQMENTSBZQR7Z0B8ZSZ2JRARE79Q4VXZMQ7W6QABXMG"
  in
  let blinded_message =
    "3KHKZJZ30ABB4E56MA2V0EQWGCWH0QQG9P2ZHYHR186C5HZXJMM4N9WXAQTKS94QSV9Y17GGNXN5MB1PZZFG7Q0FY88QPKKRG4MYCPSMTZK5W59R0MJVNJ4P4AQM96TDG5W7RV8GSNR1QQZ1GNHW3CX6D6ZRTMXB2NKB5SSYTDJS79F5ZFBRZ4HVED9JBBPWSR79KVV5QQ4APBGHBCKGMF9NJJS53A1BVYHDEVYAGFYF2SNEP827ZP50FKJ5GKGV8NQ15ESEZ69AT7GJG0T3TZVENY2YN9CVR98W3BKEZ53J7VTANARG8SJS8AMJQ7S23P5HRJ7XE9KTNRNXKH49MXV9JHHYE5535N7AGWEKR47SBCGNF44Z7XJ9RV5BQV12ZRJKN4HBZQHDNCMH3QKX9Z6G64"
  in
  let open Crypto in
  let msg = message_hash |> decode in
  let pub =
    rsa_public_key |> decode |> RsaPublicKey.of_octets |> Result.get_ok
  in
  let bks = blinding_key_secret |> decode in
  let s = FDH_RSA.rsa_blind pub ~bks ~msg |> encode in
  assert (s = blinded_message);

  ()