@aeternity/aepp-calldata/cjs/utils/bls12381.cjs

Aeternity data serialization library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.montBytes2Int = exports.int2MontBytes = void 0;
var _int2ByteArray = require("./int2ByteArray.cjs");
const CURVES = {
  r: {
    R: 1n << 256n,
    N: 0x73eda753299d7d483339d80809a1d80553bda402fffe5bfeffffffff00000001n
  },
  p: {
    R: 1n << 384n,
    /* eslint-disable-next-line max-len */
    N: 0x1a0111ea397fe69a4b1ba7b6434bacd764774b84f38512bf6730d2a0f6b0f6241eabfffeb153ffffb9feffffffffaaabn
  }
};
const xgcd = (a, b) => {
  if (b === 0n) {
    return [1n, 0n, a];
  }
  const [x, y, d] = xgcd(b, a % b);
  return [y, x - y * (a / b), d];
};
const invmod = (a, n) => {
  const [X, _Y, _D] = xgcd(a, n);

  // To ensure positive result
  return (X + n) % n;
};

// Scalar(a) = aR mod N
const int2MontBytes = (value, curveType) => {
  const curve = CURVES[curveType];
  const a = BigInt(value);
  const m = a * curve.R % curve.N;
  return (0, _int2ByteArray.int2ByteArray)(m);
};

// a = ã · R^−1 mod N
exports.int2MontBytes = int2MontBytes;
const montBytes2Int = (value, curveType) => {
  const curve = CURVES[curveType];
  const a = (0, _int2ByteArray.byteArray2IntBE)(value);
  const Rinv = invmod(curve.R, curve.N);
  return a * Rinv % curve.N;
};
exports.montBytes2Int = montBytes2Int;