Function parseKeyEncoding

lib/internal/crypto/keys.js:449–498

(enc, keyType, isPublic, objName)

}

function parseKeyEncoding(enc, keyType, isPublic, objName) {
  validateObject(enc, 'options');

  const isInput = keyType === undefined;

  const {
    format,
    type,
  } = parseKeyFormatAndType(enc, keyType, isPublic, objName);

  let cipher, passphrase, encoding;
  if (isPublic !== true) {
    ({ cipher, passphrase, encoding } = enc);

    if (format === kKeyFormatRawPrivate || format === kKeyFormatRawSeed) {
      if (cipher != null || passphrase !== undefined) {
        throw new ERR_CRYPTO_INCOMPATIBLE_KEY_OPTIONS(
          'raw format', 'does not support encryption');
      }
      return { format, type };
    }

    if (!isInput) {
      if (cipher != null) {
        if (typeof cipher !== 'string')
          throw new ERR_INVALID_ARG_VALUE(option('cipher', objName), cipher);
        if (format === kKeyFormatDER &&
            (type === kKeyEncodingPKCS1 ||
             type === kKeyEncodingSEC1)) {
          throw new ERR_CRYPTO_INCOMPATIBLE_KEY_OPTIONS(
            encodingNames[type], 'does not support encryption');
        }
      } else if (passphrase !== undefined) {
        throw new ERR_INVALID_ARG_VALUE(option('cipher', objName), cipher);
      }
    }

    if ((isInput && passphrase !== undefined &&
         !isStringOrBuffer(passphrase)) ||
        (!isInput && cipher != null && !isStringOrBuffer(passphrase))) {
      throw new ERR_INVALID_ARG_VALUE(option('passphrase', objName),
                                      passphrase);
    }
  }

  if (passphrase !== undefined)
    passphrase = getArrayBufferOrView(passphrase, 'key.passphrase', encoding);

  return { format, type, cipher, passphrase };
}

// Parses the public key encoding based on an object. keyType must be undefined
// when this is used to parse an input encoding and must be a valid key type if