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js-ecutils

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JavaScript Library for Elliptic Curve Cryptography: key exchanges (Diffie-Hellman, Massey-Omura), ECDSA signatures, and Koblitz encoding. Suitable for crypto education and secure systems.

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.Point = void 0; var _affine = require("./arithmetic/affine.js"); var _jacobian = require("./arithmetic/jacobian.js"); var _curve = require("./curve.js"); var _math = require("../utils/math.js"); function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); } function _toConsumableArray(r) { return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread(); } function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } } function _iterableToArray(r) { if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r); } function _arrayWithoutHoles(r) { if (Array.isArray(r)) return _arrayLikeToArray(r); } function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; } function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); } function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } } function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; } function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; } function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); } /** * The Point class — public-facing representation of a point on an elliptic curve. * * A point on the short Weierstrass curve y² = x³ + ax + b (mod p) belongs * to an abelian group with the following properties: * * - Closure: P + Q is also on the curve. * - Associativity: (P + Q) + R = P + (Q + R). * - Identity: There exists a special "point at infinity" O such that P + O = P. * - Inverse: For every P = (x, y), the inverse is -P = (x, -y mod p), * and P + (-P) = O. * * Usage: * * const curve = new CurveParams({ p: 23n, a: 1n, b: 1n, n: 28n, h: 1n }) * const P = new Point(0n, 1n, curve) * const Q = new Point(6n, 19n, curve) * P.add(Q) // point addition * P.mul(5n) // scalar multiplication * P.neg() // point negation * * To switch coordinate systems, create a new CurveParams with a * different coord field: * * const affineCurve = new CurveParams({ * p: 23n, a: 1n, b: 1n, n: 28n, * coord: CoordinateSystem.AFFINE * }) */ var Point = exports.Point = /*#__PURE__*/function () { /** * Create a point on an elliptic curve. * * Validates that the point lies on the curve at construction time: * * y² ≡ x³ + ax + b (mod p) * * Points produced by internal arithmetic use _trusted = true to skip * re-validation. * * @param {BigInt|null} x - x-coordinate, or null for identity (point at infinity). * @param {BigInt|null} y - y-coordinate, or null for identity. * @param {CurveParams|null} curve - Curve parameters (required for arithmetic). * @param {boolean} _trusted - If true, skip on-curve validation. */ function Point() { var x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null; var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null; var curve = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null; var _trusted = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false; _classCallCheck(this, Point); this.x = x; this.y = y; this.curve = curve; // Validate: y² ≡ x³ + ax + b (mod p) if (!_trusted) { if (x !== null && y !== null && curve !== null) { var lhs = (0, _math.modPow)(y, 2n, curve.p); var rhs = (0, _math.modulus)((0, _math.modPow)(x, 3n, curve.p) + curve.a * x + curve.b, curve.p); if (lhs !== rhs) { throw new Error("Point(".concat(x, ", ").concat(y, ") is not on the curve ") + "y\xB2 = x\xB3 + ".concat(curve.a, "x + ").concat(curve.b, " (mod ").concat(curve.p, ").")); } } } Object.freeze(this); } /** * True when this point represents the point at infinity (identity element O). */ return _createClass(Point, [{ key: "isIdentity", get: function get() { return this.x === null || this.y === null; } /** * Check whether this point satisfies the curve equation: * * y² ≡ x³ + ax + b (mod p) * * @returns {boolean} */ }, { key: "isOnCurve", value: function isOnCurve() { if (this.isIdentity || this.curve === null) return false; var lhs = (0, _math.modPow)(this.y, 2n, this.curve.p); var rhs = (0, _math.modulus)((0, _math.modPow)(this.x, 3n, this.curve.p) + this.curve.a * this.x + this.curve.b, this.curve.p); return lhs === rhs; } }, { key: "_requireCurve", value: function _requireCurve() { if (this.curve === null) { throw new Error('Cannot perform arithmetic on a Point without curve parameters. ' + "Pass a CurveParams instance via the 'curve' argument."); } return this.curve; } /** * Ensure other carries curve params (borrow ours if needed). */ }, { key: "_coerce", value: function _coerce(other) { if (other.curve === null && this.curve !== null) { return new Point(other.x, other.y, this.curve, true); } return other; } }, { key: "_wrap", value: function _wrap(x, y) { return new Point(x, y, this.curve, true); } // ----- compression ----- /** * Compress this point to its x-coordinate and parity bit. * * The y-coordinate can be recovered from x using the curve equation * and the parity bit selects which of the two square roots to use. * * @returns {[BigInt, BigInt]} [x, parity] where parity = y mod 2. * @throws {Error} If this point is the identity. */ }, { key: "compress", value: function compress() { if (this.isIdentity) { throw new Error('Cannot compress the identity point (point at infinity).'); } return [this.x, this.y % 2n]; } /** * Reconstruct a point from its compressed form. * * Given x and a parity bit, computes: * * rhs = x³ + ax + b (mod p) * y = √rhs (mod p) * * and selects the root matching the parity bit. * * @param {BigInt} x - The x-coordinate. * @param {BigInt} parity - 0n or 1n indicating which y to select. * @param {CurveParams} curve * @returns {Point} * @throws {Error} If x does not correspond to a valid point. */ }, { key: "compressSec1", value: // ----- SEC 1 compression (interoperable) ----- /** * Compress this point to SEC 1 / X9.62 format. * * The output is a single byte prefix (0x02 for even y, 0x03 * for odd y) followed by the x-coordinate as a big-endian unsigned * integer, zero-padded to the field size. * * @returns {Uint8Array} Compressed point bytes. * @throws {Error} If this point is the identity or has no curve params. */ function compressSec1() { if (this.isIdentity) { throw new Error('Cannot compress the identity point (point at infinity).'); } var curve = this._requireCurve(); var byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n); var prefix = this.y % 2n ? 0x03 : 0x02; var xBytes = bigIntToBytes(this.x, byteLen); var result = new Uint8Array(1 + byteLen); result[0] = prefix; result.set(xBytes, 1); return result; } /** * Serialize this point to SEC 1 / X9.62 uncompressed format. * * The output is 0x04 || x || y, where x and y are big-endian * unsigned integers zero-padded to the field size. * * @returns {Uint8Array} Uncompressed point bytes. * @throws {Error} If this point is the identity or has no curve params. */ }, { key: "toUncompressedSec1", value: function toUncompressedSec1() { if (this.isIdentity) { throw new Error('Cannot serialize the identity point (point at infinity).'); } var curve = this._requireCurve(); var byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n); var xBytes = bigIntToBytes(this.x, byteLen); var yBytes = bigIntToBytes(this.y, byteLen); var result = new Uint8Array(1 + 2 * byteLen); result[0] = 0x04; result.set(xBytes, 1); result.set(yBytes, 1 + byteLen); return result; } /** * Deserialize a point from SEC 1 / X9.62 format. * * Supports both compressed (0x02/0x03 prefix) and * uncompressed (0x04 prefix) encodings. * * @param {Uint8Array} data - The SEC 1 encoded point bytes. * @param {CurveParams} curve * @returns {Point} * @throws {Error} If the data is malformed or the point is invalid. */ }, { key: "neg", value: // ----- operators ----- /** * Return the additive inverse: -P = (x, -y mod p). * * @returns {Point} */ function neg() { if (this.isIdentity) return this; var curve = this._requireCurve(); return new Point(this.x, (0, _math.modulus)(-this.y, curve.p), curve, true); } /** * Add two points on the same curve using the group law. * * Delegates to affine or Jacobian arithmetic depending on * curve.coord. The chord-and-tangent formulas are: * * Addition (P ≠ Q): * λ = (y₂ - y₁) · (x₂ - x₁)⁻¹ * x₃ = λ² - x₁ - x₂ * y₃ = λ(x₁ - x₃) - y₁ * * Doubling (P = Q): * λ = (3x₁² + a) · (2y₁)⁻¹ * x₃ = λ² - 2x₁ * y₃ = λ(x₁ - x₃) - y₁ * * @param {Point} other * @returns {Point} */ }, { key: "add", value: function add(other) { var curve = this._requireCurve(); other = this._coerce(other); if (curve.coord === _curve.CoordinateSystem.JACOBIAN) { var jp1 = (0, _jacobian.toJacobian)(this); var jp2 = (0, _jacobian.toJacobian)(other); var jp3 = (0, _jacobian.jacAdd)(jp1, jp2, curve); return this._wrap.apply(this, _toConsumableArray((0, _jacobian.toAffine)(jp3, curve))); } return this._wrap.apply(this, _toConsumableArray((0, _affine.affineAdd)(this.x, this.y, other.x, other.y, curve))); } /** * Subtract: P - Q = P + (-Q). * * @param {Point} other * @returns {Point} */ }, { key: "sub", value: function sub(other) { return this.add(other.neg ? other.neg() : new Point(other.x, (0, _math.modulus)(-other.y, this._requireCurve().p), other.curve || this.curve, true)); } /** * Scalar multiplication: k · P via double-and-add in O(log k). * * The scalar k is reduced modulo the group order n before * multiplication, so that n·P = O (the identity). * * @param {BigInt} k - Scalar multiplier. * @returns {Point} */ }, { key: "mul", value: function mul(k) { var curve = this._requireCurve(); k = (0, _math.modulus)(k, curve.n); if (curve.coord === _curve.CoordinateSystem.JACOBIAN) { var jp = (0, _jacobian.toJacobian)(this); var jpResult = (0, _jacobian.jacMul)(k, jp, curve); return this._wrap.apply(this, _toConsumableArray((0, _jacobian.toAffine)(jpResult, curve))); } return this._wrap.apply(this, _toConsumableArray((0, _affine.affineMul)(k, this.x, this.y, curve))); } }, { key: "toString", value: function toString() { if (this.isIdentity) return 'Point(∞)'; return "Point(x=".concat(this.x, ", y=").concat(this.y, ")"); } }], [{ key: "decompress", value: function decompress(x, parity, curve) { var rhs = (0, _math.modulus)((0, _math.modPow)(x, 3n, curve.p) + curve.a * x + curve.b, curve.p); var y = (0, _math.modularSqrt)(rhs, curve.p); if (y === null) { throw new Error("x=".concat(x, " does not correspond to a valid point on the curve ") + "y\xB2 = x\xB3 + ".concat(curve.a, "x + ").concat(curve.b, " (mod ").concat(curve.p, ").")); } if (y % 2n !== parity) { y = curve.p - y; } return new Point(x, y, curve); } }, { key: "fromSec1", value: function fromSec1(data, curve) { if (data.length < 2) { throw new Error('SEC 1 data too short.'); } var byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n); var prefix = data[0]; if (prefix === 0x02 || prefix === 0x03) { if (data.length !== 1 + byteLen) { throw new Error("Compressed SEC 1 data must be ".concat(1 + byteLen, " bytes, got ").concat(data.length, ".")); } var x = bytesToBigInt(data.slice(1)); var parity = BigInt(prefix - 0x02); // 0 for even, 1 for odd return Point.decompress(x, parity, curve); } if (prefix === 0x04) { if (data.length !== 1 + 2 * byteLen) { throw new Error("Uncompressed SEC 1 data must be ".concat(1 + 2 * byteLen, " bytes, got ").concat(data.length, ".")); } var _x = bytesToBigInt(data.slice(1, 1 + byteLen)); var y = bytesToBigInt(data.slice(1 + byteLen)); return new Point(_x, y, curve); } throw new Error("Unknown SEC 1 prefix: 0x".concat(prefix.toString(16).padStart(2, '0'), ". Expected 0x02, 0x03, or 0x04.")); } }]); }(); // ----- helper functions for byte ↔ BigInt conversion ----- function bigIntToBytes(value, length) { var hex = value.toString(16).padStart(length * 2, '0'); var bytes = new Uint8Array(length); for (var i = 0; i < length; i++) { bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16); } return bytes; } function bytesToBigInt(bytes) { var hex = ''; for (var i = 0; i < bytes.length; i++) { hex += bytes[i].toString(16).padStart(2, '0'); } return BigInt('0x' + hex); } //# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_affine","require","_jacobian","_curve","_math","_typeof","o","Symbol","iterator","constructor","prototype","_toConsumableArray","r","_arrayWithoutHoles","_iterableToArray","_unsupportedIterableToArray","_nonIterableSpread","TypeError","a","_arrayLikeToArray","t","toString","call","slice","name","Array","from","test","isArray","length","e","n","_classCallCheck","_defineProperties","enumerable","configurable","writable","Object","defineProperty","_toPropertyKey","key","_createClass","i","_toPrimitive","toPrimitive","String","Number","Point","exports","x","arguments","undefined","y","curve","_trusted","lhs","modPow","p","rhs","modulus","b","Error","concat","freeze","get","value","isOnCurve","isIdentity","_requireCurve","_coerce","other","_wrap","compress","compressSec1","byteLen","BigInt","prefix","xBytes","bigIntToBytes","result","Uint8Array","set","toUncompressedSec1","yBytes","neg","add","coord","CoordinateSystem","JACOBIAN","jp1","toJacobian","jp2","jp3","jacAdd","apply","toAffine","affineAdd","sub","mul","k","jp","jpResult","jacMul","affineMul","decompress","parity","modularSqrt","fromSec1","data","bytesToBigInt","padStart","hex","bytes","parseInt"],"sources":["../../../src/core/point.js"],"sourcesContent":["/**\n * The Point class — public-facing representation of a point on an elliptic curve.\n *\n * A point on the short Weierstrass curve y² = x³ + ax + b (mod p) belongs\n * to an abelian group with the following properties:\n *\n * - Closure:       P + Q is also on the curve.\n * - Associativity: (P + Q) + R = P + (Q + R).\n * - Identity:      There exists a special \"point at infinity\" O such that P + O = P.\n * - Inverse:       For every P = (x, y), the inverse is -P = (x, -y mod p),\n *                  and P + (-P) = O.\n *\n * Usage:\n *\n *     const curve = new CurveParams({ p: 23n, a: 1n, b: 1n, n: 28n, h: 1n })\n *     const P = new Point(0n, 1n, curve)\n *     const Q = new Point(6n, 19n, curve)\n *     P.add(Q)          // point addition\n *     P.mul(5n)         // scalar multiplication\n *     P.neg()           // point negation\n *\n * To switch coordinate systems, create a new CurveParams with a\n * different coord field:\n *\n *     const affineCurve = new CurveParams({\n *       p: 23n, a: 1n, b: 1n, n: 28n,\n *       coord: CoordinateSystem.AFFINE\n *     })\n */\n\nimport { affineAdd, affineMul } from './arithmetic/affine.js'\nimport { jacAdd, jacMul, toAffine, toJacobian } from './arithmetic/jacobian.js'\nimport { CoordinateSystem } from './curve.js'\nimport { modularSqrt, modulus, modPow } from '../utils/math.js'\n\nexport class Point {\n  /**\n   * Create a point on an elliptic curve.\n   *\n   * Validates that the point lies on the curve at construction time:\n   *\n   *     y² ≡ x³ + ax + b  (mod p)\n   *\n   * Points produced by internal arithmetic use _trusted = true to skip\n   * re-validation.\n   *\n   * @param {BigInt|null} x          - x-coordinate, or null for identity (point at infinity).\n   * @param {BigInt|null} y          - y-coordinate, or null for identity.\n   * @param {CurveParams|null} curve - Curve parameters (required for arithmetic).\n   * @param {boolean} _trusted       - If true, skip on-curve validation.\n   */\n  constructor(x = null, y = null, curve = null, _trusted = false) {\n    this.x = x\n    this.y = y\n    this.curve = curve\n\n    // Validate: y² ≡ x³ + ax + b (mod p)\n    if (!_trusted) {\n      if (x !== null && y !== null && curve !== null) {\n        const lhs = modPow(y, 2n, curve.p)\n        const rhs = modulus(\n          modPow(x, 3n, curve.p) + curve.a * x + curve.b,\n          curve.p,\n        )\n        if (lhs !== rhs) {\n          throw new Error(\n            `Point(${x}, ${y}) is not on the curve ` +\n              `y² = x³ + ${curve.a}x + ${curve.b} (mod ${curve.p}).`,\n          )\n        }\n      }\n    }\n\n    Object.freeze(this)\n  }\n\n  /**\n   * True when this point represents the point at infinity (identity element O).\n   */\n  get isIdentity() {\n    return this.x === null || this.y === null\n  }\n\n  /**\n   * Check whether this point satisfies the curve equation:\n   *\n   *     y² ≡ x³ + ax + b  (mod p)\n   *\n   * @returns {boolean}\n   */\n  isOnCurve() {\n    if (this.isIdentity || this.curve === null) return false\n    const lhs = modPow(this.y, 2n, this.curve.p)\n    const rhs = modulus(\n      modPow(this.x, 3n, this.curve.p) + this.curve.a * this.x + this.curve.b,\n      this.curve.p,\n    )\n    return lhs === rhs\n  }\n\n  _requireCurve() {\n    if (this.curve === null) {\n      throw new Error(\n        'Cannot perform arithmetic on a Point without curve parameters. ' +\n          \"Pass a CurveParams instance via the 'curve' argument.\",\n      )\n    }\n    return this.curve\n  }\n\n  /**\n   * Ensure other carries curve params (borrow ours if needed).\n   */\n  _coerce(other) {\n    if (other.curve === null && this.curve !== null) {\n      return new Point(other.x, other.y, this.curve, true)\n    }\n    return other\n  }\n\n  _wrap(x, y) {\n    return new Point(x, y, this.curve, true)\n  }\n\n  // ----- compression -----\n\n  /**\n   * Compress this point to its x-coordinate and parity bit.\n   *\n   * The y-coordinate can be recovered from x using the curve equation\n   * and the parity bit selects which of the two square roots to use.\n   *\n   * @returns {[BigInt, BigInt]} [x, parity] where parity = y mod 2.\n   * @throws {Error} If this point is the identity.\n   */\n  compress() {\n    if (this.isIdentity) {\n      throw new Error('Cannot compress the identity point (point at infinity).')\n    }\n    return [this.x, this.y % 2n]\n  }\n\n  /**\n   * Reconstruct a point from its compressed form.\n   *\n   * Given x and a parity bit, computes:\n   *\n   *     rhs = x³ + ax + b  (mod p)\n   *     y   = √rhs         (mod p)\n   *\n   * and selects the root matching the parity bit.\n   *\n   * @param {BigInt} x       - The x-coordinate.\n   * @param {BigInt} parity  - 0n or 1n indicating which y to select.\n   * @param {CurveParams} curve\n   * @returns {Point}\n   * @throws {Error} If x does not correspond to a valid point.\n   */\n  static decompress(x, parity, curve) {\n    const rhs = modulus(modPow(x, 3n, curve.p) + curve.a * x + curve.b, curve.p)\n    let y = modularSqrt(rhs, curve.p)\n    if (y === null) {\n      throw new Error(\n        `x=${x} does not correspond to a valid point on the curve ` +\n          `y² = x³ + ${curve.a}x + ${curve.b} (mod ${curve.p}).`,\n      )\n    }\n    if (y % 2n !== parity) {\n      y = curve.p - y\n    }\n    return new Point(x, y, curve)\n  }\n\n  // ----- SEC 1 compression (interoperable) -----\n\n  /**\n   * Compress this point to SEC 1 / X9.62 format.\n   *\n   * The output is a single byte prefix (0x02 for even y, 0x03\n   * for odd y) followed by the x-coordinate as a big-endian unsigned\n   * integer, zero-padded to the field size.\n   *\n   * @returns {Uint8Array} Compressed point bytes.\n   * @throws {Error} If this point is the identity or has no curve params.\n   */\n  compressSec1() {\n    if (this.isIdentity) {\n      throw new Error('Cannot compress the identity point (point at infinity).')\n    }\n    const curve = this._requireCurve()\n    const byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n)\n    const prefix = this.y % 2n ? 0x03 : 0x02\n    const xBytes = bigIntToBytes(this.x, byteLen)\n    const result = new Uint8Array(1 + byteLen)\n    result[0] = prefix\n    result.set(xBytes, 1)\n    return result\n  }\n\n  /**\n   * Serialize this point to SEC 1 / X9.62 uncompressed format.\n   *\n   * The output is 0x04 || x || y, where x and y are big-endian\n   * unsigned integers zero-padded to the field size.\n   *\n   * @returns {Uint8Array} Uncompressed point bytes.\n   * @throws {Error} If this point is the identity or has no curve params.\n   */\n  toUncompressedSec1() {\n    if (this.isIdentity) {\n      throw new Error(\n        'Cannot serialize the identity point (point at infinity).',\n      )\n    }\n    const curve = this._requireCurve()\n    const byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n)\n    const xBytes = bigIntToBytes(this.x, byteLen)\n    const yBytes = bigIntToBytes(this.y, byteLen)\n    const result = new Uint8Array(1 + 2 * byteLen)\n    result[0] = 0x04\n    result.set(xBytes, 1)\n    result.set(yBytes, 1 + byteLen)\n    return result\n  }\n\n  /**\n   * Deserialize a point from SEC 1 / X9.62 format.\n   *\n   * Supports both compressed (0x02/0x03 prefix) and\n   * uncompressed (0x04 prefix) encodings.\n   *\n   * @param {Uint8Array} data  - The SEC 1 encoded point bytes.\n   * @param {CurveParams} curve\n   * @returns {Point}\n   * @throws {Error} If the data is malformed or the point is invalid.\n   */\n  static fromSec1(data, curve) {\n    if (data.length < 2) {\n      throw new Error('SEC 1 data too short.')\n    }\n    const byteLen = Number((BigInt(curve.p.toString(2).length) + 7n) / 8n)\n    const prefix = data[0]\n\n    if (prefix === 0x02 || prefix === 0x03) {\n      if (data.length !== 1 + byteLen) {\n        throw new Error(\n          `Compressed SEC 1 data must be ${1 + byteLen} bytes, got ${data.length}.`,\n        )\n      }\n      const x = bytesToBigInt(data.slice(1))\n      const parity = BigInt(prefix - 0x02) // 0 for even, 1 for odd\n      return Point.decompress(x, parity, curve)\n    }\n\n    if (prefix === 0x04) {\n      if (data.length !== 1 + 2 * byteLen) {\n        throw new Error(\n          `Uncompressed SEC 1 data must be ${1 + 2 * byteLen} bytes, got ${data.length}.`,\n        )\n      }\n      const x = bytesToBigInt(data.slice(1, 1 + byteLen))\n      const y = bytesToBigInt(data.slice(1 + byteLen))\n      return new Point(x, y, curve)\n    }\n\n    throw new Error(\n      `Unknown SEC 1 prefix: 0x${prefix.toString(16).padStart(2, '0')}. Expected 0x02, 0x03, or 0x04.`,\n    )\n  }\n\n  // ----- operators -----\n\n  /**\n   * Return the additive inverse: -P = (x, -y mod p).\n   *\n   * @returns {Point}\n   */\n  neg() {\n    if (this.isIdentity) return this\n    const curve = this._requireCurve()\n    return new Point(this.x, modulus(-this.y, curve.p), curve, true)\n  }\n\n  /**\n   * Add two points on the same curve using the group law.\n   *\n   * Delegates to affine or Jacobian arithmetic depending on\n   * curve.coord.  The chord-and-tangent formulas are:\n   *\n   * Addition (P ≠ Q):\n   *     λ  = (y₂ - y₁) · (x₂ - x₁)⁻¹\n   *     x₃ = λ² - x₁ - x₂\n   *     y₃ = λ(x₁ - x₃) - y₁\n   *\n   * Doubling (P = Q):\n   *     λ  = (3x₁² + a) · (2y₁)⁻¹\n   *     x₃ = λ² - 2x₁\n   *     y₃ = λ(x₁ - x₃) - y₁\n   *\n   * @param {Point} other\n   * @returns {Point}\n   */\n  add(other) {\n    const curve = this._requireCurve()\n    other = this._coerce(other)\n\n    if (curve.coord === CoordinateSystem.JACOBIAN) {\n      const jp1 = toJacobian(this)\n      const jp2 = toJacobian(other)\n      const jp3 = jacAdd(jp1, jp2, curve)\n      return this._wrap(...toAffine(jp3, curve))\n    }\n\n    return this._wrap(...affineAdd(this.x, this.y, other.x, other.y, curve))\n  }\n\n  /**\n   * Subtract: P - Q = P + (-Q).\n   *\n   * @param {Point} other\n   * @returns {Point}\n   */\n  sub(other) {\n    return this.add(\n      other.neg\n        ? other.neg()\n        : new Point(\n            other.x,\n            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