18 function pbkdf2(password, salt, iterations, keylen, digest, callback) {  argument
19   if (typeof digest === 'function') {
20     callback = digest;
21     digest = undefined;
24   ({ password, salt, iterations, keylen, digest } =
25     check(password, salt, iterations, keylen, digest));
40   handleError(_pbkdf2(keybuf, password, salt, iterations, digest, wrap),
41               digest);
44 function pbkdf2Sync(password, salt, iterations, keylen, digest) {  argument
45   ({ password, salt, iterations, keylen, digest } =
46     check(password, salt, iterations, keylen, digest));
48   handleError(_pbkdf2(keybuf, password, salt, iterations, digest), digest);
54 function check(password, salt, iterations, keylen, digest) {  argument
55   if (typeof digest !== 'string')
56     throw new ERR_INVALID_ARG_TYPE('digest', 'string', digest);
63   return { password, salt, iterations, keylen, digest };
66 function handleError(rc, digest) {  argument
68     throw new ERR_CRYPTO_INVALID_DIGEST(digest);