noble-curves/test/hash-to-curve.test.js

import { deepStrictEqual } from 'assert';
import { describe, should } from 'micro-should';
import { bytesToHex } from '@noble/hashes/utils';
// Generic tests for all curves in package
import { sha256 } from '@noble/hashes/sha256';
import { sha512 } from '@noble/hashes/sha512';
import { shake128, shake256 } from '@noble/hashes/sha3';
import * as secp256r1 from '../lib/esm/p256.js';
import * as secp384r1 from '../lib/esm/p384.js';
import * as secp521r1 from '../lib/esm/p521.js';
import * as ed25519 from '../lib/esm/ed25519.js';
import * as ed448 from '../lib/esm/ed448.js';
import * as secp256k1 from '../lib/esm/secp256k1.js';
import { bls12_381 } from '../lib/esm/bls12-381.js';
import {
  stringToBytes,
  expand_message_xmd,
  expand_message_xof,
} from '../lib/esm/abstract/hash-to-curve.js';
// XMD
import { default as xmd_sha256_38 } from './hash-to-curve/expand_message_xmd_SHA256_38.json' assert { type: 'json' };
import { default as xmd_sha256_256 } from './hash-to-curve/expand_message_xmd_SHA256_256.json' assert { type: 'json' };
import { default as xmd_sha512_38 } from './hash-to-curve/expand_message_xmd_SHA512_38.json' assert { type: 'json' };
// XOF
import { default as xof_shake128_36 } from './hash-to-curve/expand_message_xof_SHAKE128_36.json' assert { type: 'json' };
import { default as xof_shake128_256 } from './hash-to-curve/expand_message_xof_SHAKE128_256.json' assert { type: 'json' };
import { default as xof_shake256_36 } from './hash-to-curve/expand_message_xof_SHAKE256_36.json' assert { type: 'json' };
// P256
import { default as p256_ro } from './hash-to-curve/P256_XMD:SHA-256_SSWU_RO_.json' assert { type: 'json' };
import { default as p256_nu } from './hash-to-curve/P256_XMD:SHA-256_SSWU_NU_.json' assert { type: 'json' };
// P384
import { default as p384_ro } from './hash-to-curve/P384_XMD:SHA-384_SSWU_RO_.json' assert { type: 'json' };
import { default as p384_nu } from './hash-to-curve/P384_XMD:SHA-384_SSWU_NU_.json' assert { type: 'json' };
// P521
import { default as p521_ro } from './hash-to-curve/P521_XMD:SHA-512_SSWU_RO_.json' assert { type: 'json' };
import { default as p521_nu } from './hash-to-curve/P521_XMD:SHA-512_SSWU_NU_.json' assert { type: 'json' };
// secp256k1
import { default as secp256k1_ro } from './hash-to-curve/secp256k1_XMD:SHA-256_SSWU_RO_.json' assert { type: 'json' };
import { default as secp256k1_nu } from './hash-to-curve/secp256k1_XMD:SHA-256_SSWU_NU_.json' assert { type: 'json' };
// bls-G1
import { default as g1_ro } from './hash-to-curve/BLS12381G1_XMD:SHA-256_SSWU_RO_.json' assert { type: 'json' };
import { default as g1_nu } from './hash-to-curve/BLS12381G1_XMD:SHA-256_SSWU_NU_.json' assert { type: 'json' };
// bls-G2
import { default as g2_ro } from './hash-to-curve/BLS12381G2_XMD:SHA-256_SSWU_RO_.json' assert { type: 'json' };
import { default as g2_nu } from './hash-to-curve/BLS12381G2_XMD:SHA-256_SSWU_NU_.json' assert { type: 'json' };
// ed25519
import { default as ed25519_ro } from './hash-to-curve/edwards25519_XMD:SHA-512_ELL2_RO_.json' assert { type: 'json' };
import { default as ed25519_nu } from './hash-to-curve/edwards25519_XMD:SHA-512_ELL2_NU_.json' assert { type: 'json' };
// ed448
import { default as ed448_ro } from './hash-to-curve/edwards448_XOF:SHAKE256_ELL2_RO_.json' assert { type: 'json' };
import { default as ed448_nu } from './hash-to-curve/edwards448_XOF:SHAKE256_ELL2_NU_.json' assert { type: 'json' };

function testExpandXMD(hash, vectors) {
  describe(`${vectors.hash}/${vectors.DST.length}`, () => {
    for (let i = 0; i < vectors.tests.length; i++) {
      const t = vectors.tests[i];
      should(`${vectors.hash}/${vectors.DST.length}/${i}`, () => {
        const p = expand_message_xmd(
          stringToBytes(t.msg),
          stringToBytes(vectors.DST),
          t.len_in_bytes,
          hash
        );
        deepStrictEqual(bytesToHex(p), t.uniform_bytes);
      });
    }
  });
}

describe('expand_message_xmd', () => {
  testExpandXMD(sha256, xmd_sha256_38);
  testExpandXMD(sha256, xmd_sha256_256);
  testExpandXMD(sha512, xmd_sha512_38);
});

function testExpandXOF(hash, vectors) {
  describe(`${vectors.hash}/${vectors.DST.length}`, () => {
    for (let i = 0; i < vectors.tests.length; i++) {
      const t = vectors.tests[i];
      should(`${i}`, () => {
        const p = expand_message_xof(
          stringToBytes(t.msg),
          stringToBytes(vectors.DST),
          +t.len_in_bytes,
          vectors.k,
          hash
        );
        deepStrictEqual(bytesToHex(p), t.uniform_bytes);
      });
    }
  });
}

describe('expand_message_xof', () => {
  testExpandXOF(shake128, xof_shake128_36);
  testExpandXOF(shake128, xof_shake128_256);
  testExpandXOF(shake256, xof_shake256_36);
});

function stringToFp(s) {
  // bls-G2 support
  if (s.includes(',')) {
    const [c0, c1] = s.split(',').map(BigInt);
    return { c0, c1 };
  }
  return BigInt(s);
}

function testCurve(curve, ro, nu) {
  describe(`${ro.curve}/${ro.ciphersuite}`, () => {
    for (let i = 0; i < ro.vectors.length; i++) {
      const t = ro.vectors[i];
      should(`(${i})`, () => {
        const p = curve
          .hashToCurve(stringToBytes(t.msg), {
            DST: ro.dst,
          })
          .toAffine();
        deepStrictEqual(p.x, stringToFp(t.P.x), 'Px');
        deepStrictEqual(p.y, stringToFp(t.P.y), 'Py');
      });
    }
  });
  describe(`${nu.curve}/${nu.ciphersuite}`, () => {
    for (let i = 0; i < nu.vectors.length; i++) {
      const t = nu.vectors[i];
      should(`(${i})`, () => {
        const p = curve
          .encodeToCurve(stringToBytes(t.msg), {
            DST: nu.dst,
          })
          .toAffine();
        deepStrictEqual(p.x, stringToFp(t.P.x), 'Px');
        deepStrictEqual(p.y, stringToFp(t.P.y), 'Py');
      });
    }
  });
}

testCurve(secp256r1, p256_ro, p256_nu);
testCurve(secp384r1, p384_ro, p384_nu);
testCurve(secp521r1, p521_ro, p521_nu);
testCurve(bls12_381.hashToCurve.G1, g1_ro, g1_nu);
testCurve(bls12_381.hashToCurve.G2, g2_ro, g2_nu);
testCurve(secp256k1, secp256k1_ro, secp256k1_nu);
testCurve(ed25519, ed25519_ro, ed25519_nu);
testCurve(ed448, ed448_ro, ed448_nu);

// ESM is broken.
import url from 'url';
if (import.meta.url === url.pathToFileURL(process.argv[1]).href) {
  should.run();
}