import 'dart:typed_data';

import 'package:pointycastle/pointycastle.dart';
import 'package:pointycastle/src/utils.dart';
import 'package:test/test.dart';

class ECDHTestvector {
  final int index;
  late final ECPrivateKey privateKey;
  late final ECPublicKey publicKey;
  late final BigInt Z;

  ECDHTestvector(this.index, String a, String bx, String by, String z,
      ECDomainParameters ecDomainParameters) {
    final curve = ecDomainParameters.curve;
    privateKey = ECPrivateKey(BigInt.parse(a, radix: 16), ecDomainParameters);
    publicKey = ECPublicKey(
        curve.createPoint(
            BigInt.parse(bx, radix: 16), BigInt.parse(by, radix: 16)),
        ecDomainParameters);
    Z = BigInt.parse(z, radix: 16);
  }
}

class P256Testvector extends ECDHTestvector {
  P256Testvector(int index, String a, String bx, String by, String z)
      : super(index, a, bx, by, z, ECDomainParameters('secp256r1'));
}

class BrainpoolP256r1TestVector extends ECDHTestvector {
  BrainpoolP256r1TestVector(int index, String a, String bx, String by, String z)
      : super(index, a, bx, by, z, ECDomainParameters('brainpoolp256r1'));
}

// From http://csrc.nist.gov/groups/STM/cavp/documents/components/ecccdhtestvectors.zip
final testVectors = <P256Testvector>[
  P256Testvector(
      1,
      '07d7dc5f71eb29ddaf80d6214632eeae03d9058af1fb6d22ed80badb62bc1a534',
      '700C48F77F56584C5CC632CA65640DB91B6BACCE3A4DF6B42CE7CC838833D287',
      'DB71E509E3FD9B060DDB20BA5C51DCC5948D46FBF640DFE0441782CAB85FA4AC',
      '46FC62106420FF012E54A434FBDD2D25CCC5852060561E68040DD7778997BD7B'),
  P256Testvector(
      2,
      '38f65d6dce47676044d58ce5139582d568f64bb16098d179dbab07741dd5caf5',
      '809F04289C64348C01515EB03D5CE7AC1A8CB9498F5CAA50197E58D43A86A7AE',
      'B29D84E811197F25EBA8F5194092CB6FF440E26D4421011372461F579271CDA3',
      '057d636096cb80b67a8c038c890e887d1adfa4195e9b3ce241c8a778c59cda67'),
  P256Testvector(
      3,
      '1accfaf1b97712b85a6f54b148985a1bdc4c9bec0bd258cad4b3d603f49f32c8',
      'A2339C12D4A03C33546DE533268B4AD667DEBF458B464D77443636440EE7FEC3',
      'EF48A3AB26E20220BCDA2C1851076839DAE88EAE962869A497BF73CB66FAF536',
      '2D457B78B4614132477618A5B077965EC90730A8C81A1C75D6D4EC68005D67EC'),
  P256Testvector(
      4,
      '207c43a79bfee03db6f4b944f53d2fb76cc49ef1c9c4d34d51b6c65c4db6932d',
      'DF3989B9FA55495719B3CF46DCCD28B5153F7808191DD518EFF0C3CFF2B705ED',
      '422294FF46003429D739A33206C8752552C8BA54A270DEFC06E221E0FEAF6AC4',
      '96441259534B80F6AEE3D287A6BB17B5094DD4277D9E294F8FE73E48BF2A0024'),
  P256Testvector(
      5,
      '59137e38152350b195c9718d39673d519838055ad908dd4757152fd8255c09bf',
      '41192D2813E79561E6A1D6F53C8BC1A433A199C835E141B05A74A97B0FAEB922',
      '1AF98CC45E98A7E041B01CF35F462B7562281351C8EBF3FFA02E33A0722A1328',
      '19D44C8D63E8E8DD12C22A87B8CD4ECE27ACDDE04DBF47F7F27537A6999A8E62'),
  P256Testvector(
      6,
      'f5f8e0174610a661277979b58ce5c90fee6c9b3bb346a90a7196255e40b132ef',
      '33E82092A0F1FB38F5649D5867FBA28B503172B7035574BF8E5B7100A3052792',
      'F2CF6B601E0A05945E335550BF648D782F46186C772C0F20D3CD0D6B8CA14B2F',
      '664E45D5BBA4AC931CD65D52017E4BE9B19A515F669BEA4703542A2C525CD3D3'),
  P256Testvector(
      7,
      '3b589af7db03459c23068b64f63f28d3c3c6bc25b5bf76ac05f35482888b5190',
      '6A9E0C3F916E4E315C91147BE571686D90464E8BF981D34A90B6353BCA6EEBA7',
      '40F9BEAD39C2F2BCC2602F75B8A73EC7BDFFCBCEAD159D0174C6C4D3C5357F05',
      'CA342DAA50DC09D61BE7C196C85E60A80C5CB04931746820BE548CDDE055679D'),
  P256Testvector(
      8,
      'd8bf929a20ea7436b2461b541a11c80e61d826c0a4c9d322b31dd54e7f58b9c8',
      'A9C0ACADE55C2A73EAD1A86FB0A9713223C82475791CD0E210B046412CE224BB',
      'F6DE0AFA20E93E078467C053D241903EDAD734C6B403BA758C2B5FF04C9D4229',
      '35AA9B52536A461BFDE4E85FC756BE928C7DE97923F0416C7A3AC8F88B3D4489'),
  P256Testvector(
      9,
      '0f9883ba0ef32ee75ded0d8bda39a5146a29f1f2507b3bd458dbea0b2bb05b4d',
      '94E94F16A98255FFF2B9AC0C9598AAC35487B3232D3231BD93B7DB7DF36F9EB9',
      'D8049A43579CFA90B8093A94416CBEFBF93386F15B3F6E190B6E3455FEDFE69A',
      '605C16178A9BC875DCBFF54D63FE00DF699C03E8A888E9E94DFBAB90B25F39B4'),
  P256Testvector(
      10,
      '2beedb04b05c6988f6a67500bb813faf2cae0d580c9253b6339e4a3337bb6c08',
      'E099BF2A4D557460B5544430BBF6DA11004D127CB5D67F64AB07C94FCDF5274F',
      'D9C50DBE70D714EDB5E221F4E020610EEB6270517E688CA64FB0E98C7EF8C1C5',
      'F96E40A1B72840854BB62BC13C40CC2795E373D4E715980B261476835A092E0B'),
  P256Testvector(
      11,
      '77c15dcf44610e41696bab758943eff1409333e4d5a11bbe72c8f6c395e9f848',
      'F75A5FE56BDA34F3C1396296626EF012DC07E4825838778A645C8248CFF01658',
      '33BBDF1B1772D8059DF568B061F3F1122F28A8D819167C97BE448E3DC3FB0C3C',
      '8388FA79C4BABDCA02A8E8A34F9E43554976E420A4AD273C81B26E4228E9D3A3'),
  P256Testvector(
      12,
      '42a83b985011d12303db1a800f2610f74aa71cdf19c67d54ce6c9ed951e9093e',
      '2DB4540D50230756158ABF61D9835712B6486C74312183CCEFCAEF2797B7674D',
      '62F57F314E3F3495DC4E099012F5E0BA71770F9660A1EADA54104CDFDE77243E',
      '72877CEA33CCC4715038D4BCBDFE0E43F42A9E2C0C3B017FC2370F4B9ACBDA4A'),
  P256Testvector(
      13,
      'ceed35507b5c93ead5989119b9ba342cfe38e6e638ba6eea343a55475de2800b',
      'CD94FC9497E8990750309E9A8534FD114B0A6E54DA89C4796101897041D14ECB',
      'C3DEF4B5FE04FAEE0A11932229FFF563637BFDEE0E79C6DEEAF449F85401C5C4',
      'E4E7408D85FF0E0E9C838003F28CDBD5247CDCE31F32F62494B70E5F1BC36307'),
  P256Testvector(
      14,
      '43e0e9d95af4dc36483cdd1968d2b7eeb8611fcce77f3a4e7d059ae43e509604',
      '15B9E467AF4D290C417402E040426FE4CF236BAE72BAA392ED89780DFCCDB471',
      'CDF4E9170FB904302B8FD93A820BA8CC7ED4EFD3A6F2D6B05B80B2FF2AEE4E77',
      'ED56BCF695B734142C24ECB1FC1BB64D08F175EB243A31F37B3D9BB4407F3B96'),
  P256Testvector(
      15,
      'b2f3600df3368ef8a0bb85ab22f41fc0e5f4fdd54be8167a5c3cd4b08db04903',
      '49C503BA6C4FA605182E186B5E81113F075BC11DCFD51C932FB21E951EEE2FA1',
      '8AF706FF0922D87B3F0C5E4E31D8B259AEB260A9269643ED520A13BB25DA5924',
      'BC5C7055089FC9D6C89F83C1EA1ADA879D9934B2EA28FCF4E4A7E984B28AD2CF'),
  P256Testvector(
      16,
      '4002534307f8b62a9bf67ff641ddc60fef593b17c3341239e95bdb3e579bfdc8',
      '19B38DE39FDD2F70F7091631A4F75D1993740BA9429162C2A45312401636B29C',
      '09AED7232B28E060941741B6828BCDFA2BC49CC844F3773611504F82A390A5AE',
      '9A4E8E657F6B0E097F47954A63C75D74FCBA71A30D83651E3E5A91AA7CCD8343'),
  P256Testvector(
      17,
      '4dfa12defc60319021b681b3ff84a10a511958c850939ed45635934ba4979147',
      '2C91C61F33ADFE9311C942FDBFF6BA47020FEFF416B7BB63CEC13FAF9B099954',
      '6CAB31B06419E5221FCA014FB84EC870622A1B12BAB5AE43682AA7EA73EA08D0',
      '3CA1FC7AD858FB1A6ABA232542F3E2A749FFC7203A2374A3F3D3267F1FC97B78'),
  P256Testvector(
      18,
      '1331f6d874a4ed3bc4a2c6e9c74331d3039796314beee3b7152fcdba5556304e',
      'A28A2EDF58025668F724AAF83A50956B7AC1CFBBFF79B08C3BF87DFD2828D767',
      'DFA7BFFFD4C766B86ABEAF5C99B6E50CB9CCC9D9D00B7FFC7804B0491B67BC03',
      '1AAABE7EE6E4A6FA732291202433A237DF1B49BC53866BFBE00DB96A0F58224F'),
  P256Testvector(
      19,
      'dd5e9f70ae740073ca0204df60763fb6036c45709bf4a7bb4e671412fad65da3',
      'A2EF857A081F9D6EB206A81C4CF78A802BDF598AE380C8886ECD85FDC1ED7644',
      '563C4C20419F07BC17D0539FADE1855E34839515B892C0F5D26561F97FA04D1A',
      '430E6A4FBA4449D700D2733E557F66A3BF3D50517C1271B1DDAE1161B7AC798C'),
  P256Testvector(
      20,
      '5ae026cfc060d55600717e55b8a12e116d1d0df34af831979057607c2d9c2f76',
      'CCD8A2D86BC92F2E01BCE4D6922CF7FE1626AED044685E95E2EEBD464505F01F',
      'E9DDD583A9635A667777D5B8A8F31B0F79EBA12C75023410B54B8567DDDC0F38',
      '1CE9E6740529499F98D1F1D71329147A33DF1D05E4765B539B11CF615D6974D3'),
  P256Testvector(
      21,
      'b601ac425d5dbf9e1735c5e2d5bdb79ca98b3d5be4a2cfd6f2273f150e064d9d',
      'C188FFC8947F7301FB7B53E36746097C2134BF9CC981BA74B4E9C4361F595E4E',
      'BF7D2F2056E72421EF393F0C0F2B0E00130E3CAC4ABBCC00286168E85EC55051',
      '4690E3743C07D643F1BC183636AB2A9CB936A60A802113C49BB1B3F2D0661660'),
  P256Testvector(
      22,
      'fefb1dda1845312b5fce6b81b2be205af2f3a274f5a212f66c0d9fc33d7ae535',
      '317E1020FF53FCCEF18BF47BB7F2DD7707FB7B7A7578E04F35B3BEED222A0EB6',
      '09420CE5A19D77C6FE1EE587E6A49FBAF8F280E8DF033D75403302E5A27DB2AE',
      '30C2261BD0004E61FEDA2C16AA5E21FFA8D7E7F7DBF6EC379A43B48E4B36AEB0'),
  P256Testvector(
      23,
      '334ae0c4693d23935a7e8e043ebbde21e168a7cba3fa507c9be41d7681e049ce',
      '45FB02B2CEB9D7C79D9C2FA93E9C7967C2FA4DF5789F9640B24264B1E524FCB1',
      '5C6E8ECF1F7D3023893B7B1CA1E4D178972EE2A230757DDC564FFE37F5C5A321',
      '2ADAE4A138A239DCD93C243A3803C3E4CF96E37FE14E6A9B717BE9599959B11C'),
  P256Testvector(
      24,
      '2c4bde40214fcc3bfc47d4cf434b629acbe9157f8fd0282540331de7942cf09d',
      'A19EF7BFF98ADA781842FBFC51A47AFF39B5935A1C7D9625C8D323D511C92DE6',
      'E9C184DF75C955E02E02E400FFE45F78F339E1AFE6D056FB3245F4700CE606EF',
      '2E277EC30F5EA07D6CE513149B9479B96E07F4B6913B1B5C11305C1444A1BC0B'),
  P256Testvector(
      25,
      '85a268f9d7772f990c36b42b0a331adc92b5941de0b862d5d89a347cbf8faab0',
      '356C5A444C049A52FEE0ADEB7E5D82AE5AA83030BFFF31BBF8CE2096CF161C4B',
      '57D128DE8B2A57A094D1A001E572173F96E8866AE352BF29CDDAF92FC85B2F92',
      '1E51373BD2C6044C129C436E742A55BE2A668A85AE08441B6756445DF5493857'),
];

void main() {
  test('Test ECDH with brainpool keys', () {
    AsymmetricKeyPair generateKeyPair(int seed) {
      var rnd = SecureRandom('Fortuna')
        ..seed(KeyParameter(Uint8List.fromList(List<int>.filled(32, seed))));

      var domainParams = ECDomainParameters('brainpoolp256r1');
      var ecParams = ECKeyGeneratorParameters(domainParams);
      var params =
          ParametersWithRandom<ECKeyGeneratorParameters>(ecParams, rnd);
      var keygen = KeyGenerator('EC')..init(params);
      var pcecKeyPair = keygen.generateKeyPair();
      return pcecKeyPair;
    }

    for (var i = 0; i < 100; i++) {
      var key1 = generateKeyPair(i);
      var key2 = generateKeyPair(i + 1);
      var ecdsa1 = ECDHBasicAgreement()..init(key1.privateKey as ECPrivateKey);
      var ecdsa2 = ECDHBasicAgreement()..init(key2.privateKey as ECPrivateKey);
      var ag1 = ecdsa1.calculateAgreement(key2.publicKey as ECPublicKey);
      var ag2 = ecdsa2.calculateAgreement(key1.publicKey as ECPublicKey);
      expect(ag1, ag2);
    }
  });

  test('Test ECDH with jose4j derived testvector for brainpool', () {
    var z = BigInt.parse(
            '65138509659007270841390460885129724324131841274570317669830341947633356483036')
        .toRadixString(16);
    var bx = BigInt.parse(
            '9081435728752638263367097265083294633999566778486547389501321800986797192058')
        .toRadixString(16);
    var by = BigInt.parse(
            '42724727959342265773907894856035815102192701310430313271362424512013052339065')
        .toRadixString(16);
    var a = BigInt.parse(
            '11389698291027219705720854063086701177373480468419126898830387062538016871056')
        .toRadixString(16);

    var ecdhtestvector = BrainpoolP256r1TestVector(1, a, bx, by, z);
    var ecdh = ECDHBasicAgreement()..init(ecdhtestvector.privateKey);
    var ag = ecdh.calculateAgreement(ecdhtestvector.publicKey);
    expect(ag, ecdhtestvector.Z);
  });

  test('Test ECDHKDF with brainpool', () {
    var z = BigInt.parse(
            '65138509659007270841390460885129724324131841274570317669830341947633356483036')
        .toRadixString(16);
    var bx = BigInt.parse(
            '9081435728752638263367097265083294633999566778486547389501321800986797192058')
        .toRadixString(16);
    var by = BigInt.parse(
            '42724727959342265773907894856035815102192701310430313271362424512013052339065')
        .toRadixString(16);
    var a = BigInt.parse(
            '11389698291027219705720854063086701177373480468419126898830387062538016871056')
        .toRadixString(16);

    var ecdhtestvector = BrainpoolP256r1TestVector(1, a, bx, by, z);
    var kdev = KeyDerivator('ECDH');
    kdev.init(
        ECDHKDFParameters(ecdhtestvector.privateKey, ecdhtestvector.publicKey));
    var agl = kdev.process(Uint8List(0));
    var ag = decodeBigIntWithSign(1, agl);
    expect(ag, ecdhtestvector.Z);
  });

  test('Test ECDHKDF with brainpool 2', () {
    var z = BigInt.parse(
            '52654472886054093008464270686039556607329397624865361587872468137410856915')
        .toRadixString(16);
    var bx = BigInt.parse(
            '11770914954953311947851650675015300970186573673422305697535672144940842288675')
        .toRadixString(16);
    var by = BigInt.parse(
            '28588645609587273162900079046576065116292583182825622980943756235967543473722')
        .toRadixString(16);
    var a = BigInt.parse(
            '11389698291027219705720854063086701177373480468419126898830387062538016871056')
        .toRadixString(16);

    var ecdhtestvector = BrainpoolP256r1TestVector(1, a, bx, by, z);
    var kdev = KeyDerivator('ECDH');
    kdev.init(
        ECDHKDFParameters(ecdhtestvector.privateKey, ecdhtestvector.publicKey));
    var agl = kdev.process(Uint8List(0));
    var ag = decodeBigIntWithSign(1, agl);
    expect(ag, ecdhtestvector.Z);
  });

  test('Test ECDH with bouncycastle derived testvector for brainpool', () {
    var z = BigInt.parse(
            '62035452719449902544084895701129591677592844515050058000761959332847413670618')
        .toRadixString(16);
    var bx = BigInt.parse(
            '53535355328855043322505278710464138773506437230442680203030305357393812004243')
        .toRadixString(16);
    var by = BigInt.parse(
            '71732587040522161341399014632224799350721466455975116137925664616486205295601')
        .toRadixString(16);
    var a = BigInt.parse(
            '11389698291027219705720854063086701177373480468419126898830387062538016871056')
        .toRadixString(16);

    var ecdhtestvector = BrainpoolP256r1TestVector(1, a, bx, by, z);
    var ecdh = ECDHBasicAgreement()..init(ecdhtestvector.privateKey);
    var ag = ecdh.calculateAgreement(ecdhtestvector.publicKey);
    expect(ag, ecdhtestvector.Z);
  });

  test('Test ECDH with brainpool from Test vector of RFC 6932', () {
    var ecdhtestvector1 = BrainpoolP256r1TestVector(
        1,
        '041EB8B1E2BC681BCE8E39963B2E9FC415B05283313DD1A8BCC055F11AE49699',
        '8E07E219BA588916C5B06AA30A2F464C2F2ACFC1610A3BE2FB240B635341F0DB',
        '148EA1D7D1E7E54B9555B6C9AC90629C18B63BEE5D7AA6949EBBF47B24FDE40D',
        '05E940915549E9F6A4A75693716E37466ABA79B4BF2919877A16DD2CC2E23708');
    var ecdhtestvector2 = BrainpoolP256r1TestVector(
        2,
        '06F5240EACDB9837BC96D48274C8AA834B6C87BA9CC3EEDD81F99A16B8D804D3',
        '78028496B5ECAAB3C8B6C12E45DB1E02C9E4D26B4113BC4F015F60C5CCC0D206',
        'A2AE1762A3831C1D20F03F8D1E3C0C39AFE6F09B4D44BBE80CD100987B05F92B',
        '05E940915549E9F6A4A75693716E37466ABA79B4BF2919877A16DD2CC2E23708');
    var ecdh = ECDHBasicAgreement()..init(ecdhtestvector1.privateKey);
    var ag = ecdh.calculateAgreement(ecdhtestvector1.publicKey);
    expect(ag, ecdhtestvector1.Z);
    var ecdh2 = ECDHBasicAgreement()..init(ecdhtestvector2.privateKey);
    var ag2 = ecdh2.calculateAgreement(ecdhtestvector2.publicKey);
    expect(ag2, ecdhtestvector2.Z);
  });

  test('Test ECDH with test vectors for P256', () {
    for (var v in testVectors) {
      var ecdh = ECDHBasicAgreement()..init(v.privateKey);
      var ag = ecdh.calculateAgreement(v.publicKey);
      expect(ag, v.Z);
    }
  });

  test('Test ECDHKDF with test vectors for P256', () {
    for (var v in testVectors) {
      var ecdhparams = ECDHKDFParameters(v.privateKey, v.publicKey);
      var kdf = KeyDerivator('ECDH')..init(ecdhparams);
      var ag = decodeBigIntWithSign(1, kdf.process(Uint8List(0)));
      expect(ag, v.Z);
    }
  });
}