@eristack/checksum/dist/index.js

SHA-256 hex normalize and constant-time compare for exports and file refs

// src/core/checksum.ts
import { createHash, timingSafeEqual } from "crypto";

// src/core/errors.ts
var ChecksumParseError = class extends Error {
  code = "CHECKSUM_PARSE_ERROR";
  constructor(message) {
    super(message);
    this.name = "ChecksumParseError";
  }
};

// src/core/checksum.ts
var HEX_RE = /^[0-9a-fA-F]+$/;
function sha256Hex(input) {
  const hash = createHash("sha256");
  if (typeof input === "string") {
    hash.update(input, "utf8");
  } else {
    hash.update(input);
  }
  return hash.digest("hex");
}
function normalizeChecksumHex(value) {
  const trimmed = value.trim().toLowerCase();
  if (!trimmed || !HEX_RE.test(trimmed) || trimmed.length % 2 !== 0) {
    throw new ChecksumParseError("Checksum must be even-length hex");
  }
  return trimmed;
}
function checksumEquals(a, b) {
  const left = Buffer.from(normalizeChecksumHex(a), "hex");
  const right = Buffer.from(normalizeChecksumHex(b), "hex");
  if (left.length !== right.length) {
    return false;
  }
  return timingSafeEqual(left, right);
}
export {
  ChecksumParseError,
  checksumEquals,
  normalizeChecksumHex,
  sha256Hex
};
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