123456789101112131415161718192021222324252627282930313233343536373839404142 |
- /*! noble-curves - MIT License (c) 2022 Paul Miller (paulmillr.com) */
- import { sha256 } from '@noble/hashes/sha256';
- import { createCurve } from './_shortw_utils.js';
- import { createHasher } from './abstract/hash-to-curve.js';
- import { Field } from './abstract/modular.js';
- import { mapToCurveSimpleSWU } from './abstract/weierstrass.js';
- // NIST secp256r1 aka p256
- // https://www.secg.org/sec2-v2.pdf, https://neuromancer.sk/std/nist/P-256
- const Fp = Field(BigInt('0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff'));
- const CURVE_A = Fp.create(BigInt('-3'));
- const CURVE_B = BigInt('0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b');
- // prettier-ignore
- export const p256 = createCurve({
- a: CURVE_A, // Equation params: a, b
- b: CURVE_B,
- Fp, // Field: 2n**224n * (2n**32n-1n) + 2n**192n + 2n**96n-1n
- // Curve order, total count of valid points in the field
- n: BigInt('0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551'),
- // Base (generator) point (x, y)
- Gx: BigInt('0x6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296'),
- Gy: BigInt('0x4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5'),
- h: BigInt(1),
- lowS: false,
- }, sha256);
- export const secp256r1 = p256;
- const mapSWU = /* @__PURE__ */ (() => mapToCurveSimpleSWU(Fp, {
- A: CURVE_A,
- B: CURVE_B,
- Z: Fp.create(BigInt('-10')),
- }))();
- const htf = /* @__PURE__ */ (() => createHasher(secp256r1.ProjectivePoint, (scalars) => mapSWU(scalars[0]), {
- DST: 'P256_XMD:SHA-256_SSWU_RO_',
- encodeDST: 'P256_XMD:SHA-256_SSWU_NU_',
- p: Fp.ORDER,
- m: 1,
- k: 128,
- expand: 'xmd',
- hash: sha256,
- }))();
- export const hashToCurve = /* @__PURE__ */ (() => htf.hashToCurve)();
- export const encodeToCurve = /* @__PURE__ */ (() => htf.encodeToCurve)();
- //# sourceMappingURL=p256.js.map
|