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var createHmac = require('create-hmac')
var checkParameters = require('./precondition')
exports.pbkdf2 = function (password, salt, iterations, keylen, digest, callback) {
if (typeof digest === 'function') {
callback = digest
digest = undefined
}
checkParameters(iterations, keylen)
if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
setTimeout(function () {
callback(null, exports.pbkdf2Sync(password, salt, iterations, keylen, digest))
})
}
var defaultEncoding
if (process.browser) {
defaultEncoding = 'utf-8'
} else {
var pVersionMajor = parseInt(process.version.split('.')[0].slice(1), 10)
defaultEncoding = pVersionMajor >= 6 ? 'utf-8' : 'binary'
}
exports.pbkdf2Sync = function (password, salt, iterations, keylen, digest) {
if (!Buffer.isBuffer(password)) password = new Buffer(password, defaultEncoding)
if (!Buffer.isBuffer(salt)) salt = new Buffer(salt, defaultEncoding)
checkParameters(iterations, keylen)
digest = digest || 'sha1'
var hLen
var l = 1
var DK = new Buffer(keylen)
var block1 = new Buffer(salt.length + 4)
salt.copy(block1, 0, 0, salt.length)
var r
var T
for (var i = 1; i <= l; i++) {
block1.writeUInt32BE(i, salt.length)
var U = createHmac(digest, password).update(block1).digest()
if (!hLen) {
hLen = U.length
T = new Buffer(hLen)
l = Math.ceil(keylen / hLen)
r = keylen - (l - 1) * hLen
}
U.copy(T, 0, 0, hLen)
for (var j = 1; j < iterations; j++) {
U = createHmac(digest, password).update(U).digest()
for (var k = 0; k < hLen; k++) T[k] ^= U[k]
}
var destPos = (i - 1) * hLen
var len = (i === l ? r : hLen)
T.copy(DK, destPos, 0, len)
}
return DK
}
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