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var MAX_ALLOC = Math.pow(2, 30) - 1 // default in iojs
function checkBuffer (buf, name) {
if (typeof buf !== 'string' && !Buffer.isBuffer(buf)) {
throw new TypeError(name + ' must be a buffer or string')
}
}
module.exports = function (password, salt, iterations, keylen) {
checkBuffer(password, 'Password')
checkBuffer(salt, 'Salt')
if (typeof iterations !== 'number') {
throw new TypeError('Iterations not a number')
}
if (iterations < 0) {
throw new TypeError('Bad iterations')
}
if (typeof keylen !== 'number') {
throw new TypeError('Key length not a number')
}
if (keylen < 0 || keylen > MAX_ALLOC || keylen !== keylen) { /* eslint no-self-compare: 0 */
throw new TypeError('Bad key length')
}
}
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