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var sizes = {
md5: 16,
sha1: 20,
sha224: 28,
sha256: 32,
sha384: 48,
sha512: 64,
rmd160: 20,
ripemd160: 20
}
var createHmac = require('create-hmac')
var checkParameters = require('../lib/precondition')
var defaultEncoding = require('../lib/default-encoding')
var Buffer = require('safe-buffer').Buffer
function pbkdf2 (password, salt, iterations, keylen, digest) {
checkParameters(password, salt, iterations, keylen)
if (!Buffer.isBuffer(password)) password = Buffer.from(password, defaultEncoding)
if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, defaultEncoding)
digest = digest || 'sha1'
var DK = Buffer.allocUnsafe(keylen)
var block1 = Buffer.allocUnsafe(salt.length + 4)
salt.copy(block1, 0, 0, salt.length)
var destPos = 0
var hLen = sizes[digest]
var l = Math.ceil(keylen / hLen)
for (var i = 1; i <= l; i++) {
block1.writeUInt32BE(i, salt.length)
var T = createHmac(digest, password).update(block1).digest()
var U = T
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]
}
T.copy(DK, destPos)
destPos += hLen
}
return DK
}
module.exports = pbkdf2
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