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'use strict';
var md5 = require('create-hash/md5');
var RIPEMD160 = require('ripemd160');
var sha = require('sha.js');
var Buffer = require('safe-buffer').Buffer;
var checkParameters = require('./precondition');
var defaultEncoding = require('./default-encoding');
var toBuffer = require('./to-buffer');
var ZEROS = Buffer.alloc(128);
var sizes = {
__proto__: null,
md5: 16,
sha1: 20,
sha224: 28,
sha256: 32,
sha384: 48,
sha512: 64,
'sha512-256': 32,
ripemd160: 20,
rmd160: 20
};
var mapping = {
__proto__: null,
'sha-1': 'sha1',
'sha-224': 'sha224',
'sha-256': 'sha256',
'sha-384': 'sha384',
'sha-512': 'sha512',
'ripemd-160': 'ripemd160'
};
function rmd160Func(data) {
return new RIPEMD160().update(data).digest();
}
function getDigest(alg) {
function shaFunc(data) {
return sha(alg).update(data).digest();
}
if (alg === 'rmd160' || alg === 'ripemd160') {
return rmd160Func;
}
if (alg === 'md5') {
return md5;
}
return shaFunc;
}
function Hmac(alg, key, saltLen) {
var hash = getDigest(alg);
var blocksize = alg === 'sha512' || alg === 'sha384' ? 128 : 64;
if (key.length > blocksize) {
key = hash(key);
} else if (key.length < blocksize) {
key = Buffer.concat([key, ZEROS], blocksize);
}
var ipad = Buffer.allocUnsafe(blocksize + sizes[alg]);
var opad = Buffer.allocUnsafe(blocksize + sizes[alg]);
for (var i = 0; i < blocksize; i++) {
ipad[i] = key[i] ^ 0x36;
opad[i] = key[i] ^ 0x5C;
}
var ipad1 = Buffer.allocUnsafe(blocksize + saltLen + 4);
ipad.copy(ipad1, 0, 0, blocksize);
this.ipad1 = ipad1;
this.ipad2 = ipad;
this.opad = opad;
this.alg = alg;
this.blocksize = blocksize;
this.hash = hash;
this.size = sizes[alg];
}
Hmac.prototype.run = function (data, ipad) {
data.copy(ipad, this.blocksize);
var h = this.hash(ipad);
h.copy(this.opad, this.blocksize);
return this.hash(this.opad);
};
function pbkdf2(password, salt, iterations, keylen, digest) {
checkParameters(iterations, keylen);
password = toBuffer(password, defaultEncoding, 'Password');
salt = toBuffer(salt, defaultEncoding, 'Salt');
var lowerDigest = (digest || 'sha1').toLowerCase();
var mappedDigest = mapping[lowerDigest] || lowerDigest;
var size = sizes[mappedDigest];
if (typeof size !== 'number' || !size) {
throw new TypeError('Digest algorithm not supported: ' + digest);
}
var hmac = new Hmac(mappedDigest, password, salt.length);
var DK = Buffer.allocUnsafe(keylen);
var block1 = Buffer.allocUnsafe(salt.length + 4);
salt.copy(block1, 0, 0, salt.length);
var destPos = 0;
var hLen = size;
var l = Math.ceil(keylen / hLen);
for (var i = 1; i <= l; i++) {
block1.writeUInt32BE(i, salt.length);
var T = hmac.run(block1, hmac.ipad1);
var U = T;
for (var j = 1; j < iterations; j++) {
U = hmac.run(U, hmac.ipad2);
for (var k = 0; k < hLen; k++) {
T[k] ^= U[k];
}
}
T.copy(DK, destPos);
destPos += hLen;
}
return DK;
}
module.exports = pbkdf2;