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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright 2015 Fedor Indutny. All rights reserved. MIT license.// deno-lint-ignore-file no-var
import {  assert,  assertEquals,  assertThrows,} from "../../../../testing/asserts.ts";import { Buffer } from "../../../buffer.ts";import { BN } from "./bn.js";
Deno.test("BN.js/Reduction context", async function (t) {  async function testMethod(name, fn) {    await t.step(name + " method", async function (t) {      await t.step(        "should support add, iadd, sub, isub operations",        function () {          var p = new BN(257);          var m = fn(p);          var a = new BN(123).toRed(m);          var b = new BN(231).toRed(m);
          assertEquals(a.redAdd(b).fromRed().toString(10), "97");          assertEquals(a.redSub(b).fromRed().toString(10), "149");          assertEquals(b.redSub(a).fromRed().toString(10), "108");
          assertEquals(a.clone().redIAdd(b).fromRed().toString(10), "97");          assertEquals(a.clone().redISub(b).fromRed().toString(10), "149");          assertEquals(b.clone().redISub(a).fromRed().toString(10), "108");        },      );
      await t.step("should support pow and mul operations", function () {        var p192 = new BN(          "fffffffffffffffffffffffffffffffeffffffffffffffff",          16,        );        var m = fn(p192);        var a = new BN(123);        var b = new BN(231);        var c = a.toRed(m).redMul(b.toRed(m)).fromRed();        assert(c.cmp(a.mul(b).mod(p192)) === 0);
        assertEquals(          a.toRed(m).redPow(new BN(0)).fromRed()            .cmp(new BN(1)),          0,        );        assertEquals(          a.toRed(m).redPow(new BN(3)).fromRed()            .cmp(a.sqr().mul(a)),          0,        );        assertEquals(          a.toRed(m).redPow(new BN(4)).fromRed()            .cmp(a.sqr().sqr()),          0,        );        assertEquals(          a.toRed(m).redPow(new BN(8)).fromRed()            .cmp(a.sqr().sqr().sqr()),          0,        );        assertEquals(          a.toRed(m).redPow(new BN(9)).fromRed()            .cmp(a.sqr().sqr().sqr().mul(a)),          0,        );        assertEquals(          a.toRed(m).redPow(new BN(17)).fromRed()            .cmp(a.sqr().sqr().sqr().sqr().mul(a)),          0,        );        assertEquals(          a.toRed(m).redPow(new BN("deadbeefabbadead", 16)).fromRed()            .toString(16),          "3aa0e7e304e320b68ef61592bcb00341866d6fa66e11a4d6",        );      });
      await t.step("should sqrtm numbers", function () {        var p = new BN(263);        var m = fn(p);        var q = new BN(11).toRed(m);
        var qr = q.redSqrt();        assertEquals(qr.redSqr().cmp(q), 0);
        qr = q.redSqrt();        assertEquals(qr.redSqr().cmp(q), 0);
        p = new BN(          "fffffffffffffffffffffffffffffffeffffffffffffffff",          16,        );        m = fn(p);
        q = new BN(13).toRed(m);        qr = q.redSqrt(true, p);        assertEquals(qr.redSqr().cmp(q), 0);
        qr = q.redSqrt(false, p);        assertEquals(qr.redSqr().cmp(q), 0);
        // Tonelli-shanks        p = new BN(13);        m = fn(p);        q = new BN(10).toRed(m);        assertEquals(q.redSqrt().fromRed().toString(10), "7");      });
      await t.step("should invm numbers", function () {        var p = new BN(257);        var m = fn(p);        var a = new BN(3).toRed(m);        var b = a.redInvm();        assertEquals(a.redMul(b).fromRed().toString(16), "1");      });
      await t.step("should invm numbers (regression)", function () {        var p = new BN(          "ffffffff00000001000000000000000000000000ffffffffffffffffffffffff",          16,        );        var a = new BN(          "e1d969b8192fbac73ea5b7921896d6a2263d4d4077bb8e5055361d1f7f8163f3",          16,        );
        var m = fn(p);        a = a.toRed(m);
        assertEquals(a.redInvm().fromRed().negative, 0);      });
      await t.step("should imul numbers", function () {        var p = new BN(          "fffffffffffffffffffffffffffffffeffffffffffffffff",          16,        );        var m = fn(p);
        var a = new BN("deadbeefabbadead", 16);        var b = new BN("abbadeadbeefdead", 16);        var c = a.mul(b).mod(p);
        assertEquals(          a.toRed(m).redIMul(b.toRed(m)).fromRed().toString(16),          c.toString(16),        );      });
      await t.step("should pow(base, 0) == 1", function () {        var base = new BN(256).toRed(BN.red("k256"));        var exponent = new BN(0);        var result = base.redPow(exponent);        assertEquals(result.toString(), "1");      });
      await t.step("should shl numbers", function () {        var base = new BN(256).toRed(BN.red("k256"));        var result = base.redShl(1);        assertEquals(result.toString(), "512");      });
      await t.step("should reduce when converting to red", function () {        var p = new BN(257);        var m = fn(p);        var a = new BN(5).toRed(m);
        var b = a.redISub(new BN(512).toRed(m));        b.redISub(new BN(512).toRed(m));      });
      await t.step("redNeg and zero value", function () {        var a = new BN(0).toRed(BN.red("k256")).redNeg();        assertEquals(a.isZero(), true);      });
      await t.step("should not allow modulus <= 1", function () {        assertThrows(function () {          BN.red(new BN(0));        }, /^Error: modulus must be greater than 1$/);
        assertThrows(function () {          BN.red(new BN(1));        }, /^Error: modulus must be greater than 1$/);
        BN.red(new BN(2));      });    });  }
  await testMethod("Plain", BN.red);  await testMethod("Montgomery", BN.mont);
  await t.step("Pseudo-Mersenne Primes", async function (t) {    await t.step("should reduce numbers mod k256", function () {      var p = BN._prime("k256");
      assertEquals(p.ireduce(new BN(0xdead)).toString(16), "dead");      assertEquals(p.ireduce(new BN("deadbeef", 16)).toString(16), "deadbeef");
      var num = new BN(        "fedcba9876543210fedcba9876543210dead" +          "fedcba9876543210fedcba9876543210dead",        16,      );      var exp = num.mod(p.p).toString(16);      assertEquals(p.ireduce(num).toString(16), exp);
      var regr = new BN(        "f7e46df64c1815962bf7bc9c56128798" +          "3f4fcef9cb1979573163b477eab93959" +          "335dfb29ef07a4d835d22aa3b6797760" +          "70a8b8f59ba73d56d01a79af9",        16,      );      exp = regr.mod(p.p).toString(16);
      assertEquals(p.ireduce(regr).toString(16), exp);    });
    await t.step("should not fail to invm number mod k256", function () {      var regr2 = new BN(        "6c150c4aa9a8cf1934485d40674d4a7cd494675537bda36d49405c5d2c6f496f",        16,      );      regr2 = regr2.toRed(BN.red("k256"));      assertEquals(regr2.redInvm().redMul(regr2).fromRed().cmpn(1), 0);    });
    await t.step("should correctly square the number", function () {      var p = BN._prime("k256").p;      var red = BN.red("k256");
      var n = new BN(        "9cd8cb48c3281596139f147c1364a3ed" +          "e88d3f310fdb0eb98c924e599ca1b3c9",        16,      );      var expected = n.sqr().mod(p);      var actual = n.toRed(red).redSqr().fromRed();
      assertEquals(actual.toString(16), expected.toString(16));    });
    await t.step("redISqr should return right result", function () {      var n = new BN("30f28939", 16);      var actual = n.toRed(BN.red("k256")).redISqr().fromRed();      assertEquals(actual.toString(16), "95bd93d19520eb1");    });  });
  await t.step("should avoid 4.1.0 regresion", function () {    function bits2int(obits, q) {      var bits = new BN(obits);      var shift = (obits.length << 3) - q.bitLength();      if (shift > 0) {        bits.ishrn(shift);      }      return bits;    }    var t = Buffer.from(      "aff1651e4cd6036d57aa8b2a05ccf1a9d5a40166340ecbbdc55" +        "be10b568aa0aa3d05ce9a2fcec9df8ed018e29683c6051cb83e" +        "46ce31ba4edb045356a8d0d80b",      "hex",    );    var g = new BN(      "5c7ff6b06f8f143fe8288433493e4769c4d988ace5be25a0e24809670" +        "716c613d7b0cee6932f8faa7c44d2cb24523da53fbe4f6ec3595892d1" +        "aa58c4328a06c46a15662e7eaa703a1decf8bbb2d05dbe2eb956c142a" +        "338661d10461c0d135472085057f3494309ffa73c611f78b32adbb574" +        "0c361c9f35be90997db2014e2ef5aa61782f52abeb8bd6432c4dd097b" +        "c5423b285dafb60dc364e8161f4a2a35aca3a10b1c4d203cc76a470a3" +        "3afdcbdd92959859abd8b56e1725252d78eac66e71ba9ae3f1dd24871" +        "99874393cd4d832186800654760e1e34c09e4d155179f9ec0dc4473f9" +        "96bdce6eed1cabed8b6f116f7ad9cf505df0f998e34ab27514b0ffe7",      16,    );    var p = new BN(      "9db6fb5951b66bb6fe1e140f1d2ce5502374161fd6538df1648218642" +        "f0b5c48c8f7a41aadfa187324b87674fa1822b00f1ecf8136943d7c55" +        "757264e5a1a44ffe012e9936e00c1d3e9310b01c7d179805d3058b2a9" +        "f4bb6f9716bfe6117c6b5b3cc4d9be341104ad4a80ad6c94e005f4b99" +        "3e14f091eb51743bf33050c38de235567e1b34c3d6a5c0ceaa1a0f368" +        "213c3d19843d0b4b09dcb9fc72d39c8de41f1bf14d4bb4563ca283716" +        "21cad3324b6a2d392145bebfac748805236f5ca2fe92b871cd8f9c36d" +        "3292b5509ca8caa77a2adfc7bfd77dda6f71125a7456fea153e433256" +        "a2261c6a06ed3693797e7995fad5aabbcfbe3eda2741e375404ae25b",      16,    );    var q = new BN(      "f2c3119374ce76c9356990b465374a17f23f9ed35089bd969f61c6dde" +        "9998c1f",      16,    );    var k = bits2int(t, q);    var expectedR = "89ec4bb1400eccff8e7d9aa515cd1de7803f2daff09693ee7fd1353e" +      "90a68307";    var r = g.toRed(BN.mont(p)).redPow(k).fromRed().mod(q);    assertEquals(r.toString(16), expectedR);  });
  await t.step(    "K256.split for 512 bits number should return equal numbers",    function () {      var red = BN.red("k256");      var input = new BN(1).iushln(512).subn(1);      assertEquals(input.bitLength(), 512);      var output = new BN(0);      red.prime.split(input, output);      assertEquals(input.cmp(output), 0);    },  );
  await t.step("imod should change host object", function () {    var red = BN.red(new BN(13));    var a = new BN(2).toRed(red);    var b = new BN(7).toRed(red);    var c = a.redIMul(b);    assertEquals(a.toNumber(), 1);    assertEquals(c.toNumber(), 1);  });});