Function signOneShot

lib/internal/crypto/sig.js:158–217

(algorithm, data, key, callback)

};

function signOneShot(algorithm, data, key, callback) {
  if (algorithm != null)
    validateString(algorithm, 'algorithm');

  if (callback !== undefined)
    validateFunction(callback, 'callback');

  data = getArrayBufferOrView(data, 'data');

  if (!key)
    throw new ERR_CRYPTO_SIGN_KEY_REQUIRED();

  // Options specific to RSA
  const rsaPadding = getPadding(key);
  const pssSaltLength = getSaltLength(key);

  // Options specific to (EC)DSA
  const dsaSigEnc = getDSASignatureEncoding(key);

  // Options specific to Ed448 and ML-DSA
  const context = getContext(key);

  const {
    data: keyData,
    format: keyFormat,
    type: keyType,
    passphrase: keyPassphrase,
    namedCurve: keyNamedCurve,
  } = preparePrivateKey(key);

  const job = new SignJob(
    callback ? kCryptoJobAsync : kCryptoJobSync,
    kSignJobModeSign,
    keyData,
    keyFormat,
    keyType,
    keyPassphrase,
    keyNamedCurve,
    data,
    algorithm,
    pssSaltLength,
    rsaPadding,
    dsaSigEnc,
    context,
    undefined);

  if (!callback) {
    const { 0: err, 1: signature } = job.run();
    if (err !== undefined)
      throw err;

    return Buffer.from(signature);
  }

  job.ondone = (error, signature) => {
    if (error) return FunctionPrototypeCall(callback, job, error);
    FunctionPrototypeCall(callback, job, null, Buffer.from(signature));
  };