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'use strict';

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var curves = exports;

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var hash = require('hash.js');

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var elliptic = require('../elliptic');

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var assert = elliptic.utils.assert;

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function PresetCurve(options) {

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  if (options.type === 'short')

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    this.curve = new elliptic.curve.short(options);

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  else if (options.type === 'edwards')

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    this.curve = new elliptic.curve.edwards(options);

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  else

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    this.curve = new elliptic.curve.mont(options);

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  this.g = this.curve.g;

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  this.n = this.curve.n;

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  this.hash = options.hash;

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  assert(this.g.validate(), 'Invalid curve');

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  assert(this.g.mul(this.n).isInfinity(), 'Invalid curve, G*N != O');

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}

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curves.PresetCurve = PresetCurve;

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function defineCurve(name, options) {

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  Object.defineProperty(curves, name, {

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    configurable: true,

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    enumerable: true,

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    get: function() {

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      var curve = new PresetCurve(options);

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      Object.defineProperty(curves, name, {

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        configurable: true,

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        enumerable: true,

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        value: curve

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      });

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      return curve;

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    }

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  });

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}

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defineCurve('p192', {

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  type: 'short',

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  prime: 'p192',

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  p: 'ffffffff ffffffff ffffffff fffffffe ffffffff ffffffff',

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  a: 'ffffffff ffffffff ffffffff fffffffe ffffffff fffffffc',

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  b: '64210519 e59c80e7 0fa7e9ab 72243049 feb8deec c146b9b1',

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  n: 'ffffffff ffffffff ffffffff 99def836 146bc9b1 b4d22831',

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  hash: hash.sha256,

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  gRed: false,

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  g: [

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    '188da80e b03090f6 7cbf20eb 43a18800 f4ff0afd 82ff1012',

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    '07192b95 ffc8da78 631011ed 6b24cdd5 73f977a1 1e794811'

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  ]

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});

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defineCurve('p224', {

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  type: 'short',

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  prime: 'p224',

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  p: 'ffffffff ffffffff ffffffff ffffffff 00000000 00000000 00000001',

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  a: 'ffffffff ffffffff ffffffff fffffffe ffffffff ffffffff fffffffe',

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  b: 'b4050a85 0c04b3ab f5413256 5044b0b7 d7bfd8ba 270b3943 2355ffb4',

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  n: 'ffffffff ffffffff ffffffff ffff16a2 e0b8f03e 13dd2945 5c5c2a3d',

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  hash: hash.sha256,

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  gRed: false,

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  g: [

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    'b70e0cbd 6bb4bf7f 321390b9 4a03c1d3 56c21122 343280d6 115c1d21',

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    'bd376388 b5f723fb 4c22dfe6 cd4375a0 5a074764 44d58199 85007e34'

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  ]

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});

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defineCurve('p256', {

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  type: 'short',

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  prime: null,

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  p: 'ffffffff 00000001 00000000 00000000 00000000 ffffffff ffffffff ffffffff',

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  a: 'ffffffff 00000001 00000000 00000000 00000000 ffffffff ffffffff fffffffc',

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  b: '5ac635d8 aa3a93e7 b3ebbd55 769886bc 651d06b0 cc53b0f6 3bce3c3e 27d2604b',

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  n: 'ffffffff 00000000 ffffffff ffffffff bce6faad a7179e84 f3b9cac2 fc632551',

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  hash: hash.sha256,

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  gRed: false,

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  g: [

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    '6b17d1f2 e12c4247 f8bce6e5 63a440f2 77037d81 2deb33a0 f4a13945 d898c296',

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    '4fe342e2 fe1a7f9b 8ee7eb4a 7c0f9e16 2bce3357 6b315ece cbb64068 37bf51f5'

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  ]

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});

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defineCurve('curve25519', {

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  type: 'mont',

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  prime: 'p25519',

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  p: '7fffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffed',

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  a: '76d06',

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  b: '0',

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  n: '1000000000000000 0000000000000000 14def9dea2f79cd6 5812631a5cf5d3ed',

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  hash: hash.sha256,

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  gRed: false,

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  g: [

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    '9'

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  ]

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});

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defineCurve('ed25519', {

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  type: 'edwards',

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  prime: 'p25519',

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  p: '7fffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffed',

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  a: '-1',

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  c: '1',

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  // -121665 * (121666^(-1)) (mod P)

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  d: '52036cee2b6ffe73 8cc740797779e898 00700a4d4141d8ab 75eb4dca135978a3',

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  n: '1000000000000000 0000000000000000 14def9dea2f79cd6 5812631a5cf5d3ed',

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  hash: hash.sha256,

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  gRed: false,

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  g: [

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    '216936d3cd6e53fec0a4e231fdd6dc5c692cc7609525a7b2c9562d608f25d51a',

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    // 4/5

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    '6666666666666666666666666666666666666666666666666666666666666658'

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  ]

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});

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var pre;

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try {

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  pre = require('./precomputed/secp256k1');

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} catch (e) {

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  pre = undefined;

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}

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defineCurve('secp256k1', {

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  type: 'short',

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  prime: 'k256',

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  p: 'ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff fffffffe fffffc2f',

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  a: '0',

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  b: '7',

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  n: 'ffffffff ffffffff ffffffff fffffffe baaedce6 af48a03b bfd25e8c d0364141',

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  h: '1',

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  hash: hash.sha256,

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  // Precomputed endomorphism

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  beta: '7ae96a2b657c07106e64479eac3434e99cf0497512f58995c1396c28719501ee',

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  lambda: '5363ad4cc05c30e0a5261c028812645a122e22ea20816678df02967c1b23bd72',

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  basis: [

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    {

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      a: '3086d221a7d46bcde86c90e49284eb15',

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      b: '-e4437ed6010e88286f547fa90abfe4c3'

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    },

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    {

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      a: '114ca50f7a8e2f3f657c1108d9d44cfd8',

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      b: '3086d221a7d46bcde86c90e49284eb15'

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    }

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  ],

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  gRed: false,

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  g: [

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    '79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798',

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    '483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8',

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    pre

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  ]

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});

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