You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
1.6 KiB
73 lines
1.6 KiB
'use strict';
|
|
|
|
var sizes = {
|
|
__proto__: null,
|
|
md5: 16,
|
|
sha1: 20,
|
|
sha224: 28,
|
|
sha256: 32,
|
|
sha384: 48,
|
|
sha512: 64,
|
|
'sha512-256': 32,
|
|
rmd160: 20,
|
|
ripemd160: 20
|
|
};
|
|
|
|
var mapping = {
|
|
__proto__: null,
|
|
'sha-1': 'sha1',
|
|
'sha-224': 'sha224',
|
|
'sha-256': 'sha256',
|
|
'sha-384': 'sha384',
|
|
'sha-512': 'sha512',
|
|
'ripemd-160': 'ripemd160'
|
|
};
|
|
|
|
var createHmac = require('create-hmac');
|
|
var Buffer = require('safe-buffer').Buffer;
|
|
|
|
var checkParameters = require('./precondition');
|
|
var defaultEncoding = require('./default-encoding');
|
|
var toBuffer = require('./to-buffer');
|
|
|
|
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 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 = createHmac(mappedDigest, password).update(block1).digest();
|
|
var U = T;
|
|
|
|
for (var j = 1; j < iterations; j++) {
|
|
U = createHmac(mappedDigest, 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;
|
|
|