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/**
* Password-Based Key-Derivation Function #2 implementation.
*
* See RFC 2898 for details.
*
* @author Dave Longley
*
* Copyright (c) 2010-2013 Digital Bazaar, Inc.
*/
var forge = require('./forge');
require('./hmac');
require('./md');
require('./util');
var pkcs5 = forge.pkcs5 = forge.pkcs5 || {};
var crypto;
if(forge.util.isNodejs && !forge.options.usePureJavaScript) {
crypto = require('crypto');
}
/**
* Derives a key from a password.
*
* @param p the password as a binary-encoded string of bytes.
* @param s the salt as a binary-encoded string of bytes.
* @param c the iteration count, a positive integer.
* @param dkLen the intended length, in bytes, of the derived key,
* (max: 2^32 - 1) * hash length of the PRF.
* @param [md] the message digest (or algorithm identifier as a string) to use
* in the PRF, defaults to SHA-1.
* @param [callback(err, key)] presence triggers asynchronous version, called
* once the operation completes.
*
* @return the derived key, as a binary-encoded string of bytes, for the
* synchronous version (if no callback is specified).
*/
module.exports = forge.pbkdf2 = pkcs5.pbkdf2 = function(
p, s, c, dkLen, md, callback) {
if(typeof md === 'function') {
callback = md;
md = null;
}
// use native implementation if possible and not disabled, note that
// some node versions only support SHA-1, others allow digest to be changed
if(forge.util.isNodejs && !forge.options.usePureJavaScript &&
crypto.pbkdf2 && (md === null || typeof md !== 'object') &&
(crypto.pbkdf2Sync.length > 4 || (!md || md === 'sha1'))) {
if(typeof md !== 'string') {
// default prf to SHA-1
md = 'sha1';
}
p = Buffer.from(p, 'binary');
s = Buffer.from(s, 'binary');
if(!callback) {
if(crypto.pbkdf2Sync.length === 4) {
return crypto.pbkdf2Sync(p, s, c, dkLen).toString('binary');
}
return crypto.pbkdf2Sync(p, s, c, dkLen, md).toString('binary');
}
if(crypto.pbkdf2Sync.length === 4) {
return crypto.pbkdf2(p, s, c, dkLen, function(err, key) {
if(err) {
return callback(err);
}
callback(null, key.toString('binary'));
});
}
return crypto.pbkdf2(p, s, c, dkLen, md, function(err, key) {
if(err) {
return callback(err);
}
callback(null, key.toString('binary'));
});
}
if(typeof md === 'undefined' || md === null) {
// default prf to SHA-1
md = 'sha1';
}
if(typeof md === 'string') {
if(!(md in forge.md.algorithms)) {
throw new Error('Unknown hash algorithm: ' + md);
}
md = forge.md[md].create();
}
var hLen = md.digestLength;
/* 1. If dkLen > (2^32 - 1) * hLen, output "derived key too long" and
stop. */
if(dkLen > (0xFFFFFFFF * hLen)) {
var err = new Error('Derived key is too long.');
if(callback) {
return callback(err);
}
throw err;
}
/* 2. Let len be the number of hLen-octet blocks in the derived key,
rounding up, and let r be the number of octets in the last
block:
len = CEIL(dkLen / hLen),
r = dkLen - (len - 1) * hLen. */
var len = Math.ceil(dkLen / hLen);
var r = dkLen - (len - 1) * hLen;
/* 3. For each block of the derived key apply the function F defined
below to the password P, the salt S, the iteration count c, and
the block index to compute the block:
T_1 = F(P, S, c, 1),
T_2 = F(P, S, c, 2),
...
T_len = F(P, S, c, len),
where the function F is defined as the exclusive-or sum of the
first c iterates of the underlying pseudorandom function PRF
applied to the password P and the concatenation of the salt S
and the block index i:
F(P, S, c, i) = u_1 XOR u_2 XOR ... XOR u_c
where
u_1 = PRF(P, S || INT(i)),
u_2 = PRF(P, u_1),
...
u_c = PRF(P, u_{c-1}).
Here, INT(i) is a four-octet encoding of the integer i, most
significant octet first. */
var prf = forge.hmac.create();
prf.start(md, p);
var dk = '';
var xor, u_c, u_c1;
// sync version
if(!callback) {
for(var i = 1; i <= len; ++i) {
// PRF(P, S || INT(i)) (first iteration)
prf.start(null, null);
prf.update(s);
prf.update(forge.util.int32ToBytes(i));
xor = u_c1 = prf.digest().getBytes();
// PRF(P, u_{c-1}) (other iterations)
for(var j = 2; j <= c; ++j) {
prf.start(null, null);
prf.update(u_c1);
u_c = prf.digest().getBytes();
// F(p, s, c, i)
xor = forge.util.xorBytes(xor, u_c, hLen);
u_c1 = u_c;
}
/* 4. Concatenate the blocks and extract the first dkLen octets to
produce a derived key DK:
DK = T_1 || T_2 || ... || T_len<0..r-1> */
dk += (i < len) ? xor : xor.substr(0, r);
}
/* 5. Output the derived key DK. */
return dk;
}
// async version
var i = 1, j;
function outer() {
if(i > len) {
// done
return callback(null, dk);
}
// PRF(P, S || INT(i)) (first iteration)
prf.start(null, null);
prf.update(s);
prf.update(forge.util.int32ToBytes(i));
xor = u_c1 = prf.digest().getBytes();
// PRF(P, u_{c-1}) (other iterations)
j = 2;
inner();
}
function inner() {
if(j <= c) {
prf.start(null, null);
prf.update(u_c1);
u_c = prf.digest().getBytes();
// F(p, s, c, i)
xor = forge.util.xorBytes(xor, u_c, hLen);
u_c1 = u_c;
++j;
return forge.util.setImmediate(inner);
}
/* 4. Concatenate the blocks and extract the first dkLen octets to
produce a derived key DK:
DK = T_1 || T_2 || ... || T_len<0..r-1> */
dk += (i < len) ? xor : xor.substr(0, r);
++i;
outer();
}
outer();
};