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.
53 lines
1.7 KiB
53 lines
1.7 KiB
2 years ago
|
import { inherits as inherits$0 } from "util";
|
||
|
|
import Legacy from "./legacy";
|
||
|
|
import Base from "../cipher-base";
|
||
|
|
import md5 from "../create-hash/md5";
|
||
|
|
import RIPEMD160 from "../ripemd160";
|
||
|
|
import sha from "../sha/index.js";
|
||
|
|
'use strict';
|
||
|
|
var inherits = { inherits: inherits$0 }.inherits;
|
||
|
|
var ZEROS = Buffer.alloc(128);
|
||
|
|
function Hmac(alg, key) {
|
||
|
|
Base.call(this, 'digest');
|
||
|
|
if (typeof key === 'string') {
|
||
|
|
key = Buffer.from(key);
|
||
|
|
}
|
||
|
|
var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64;
|
||
|
|
this._alg = alg;
|
||
|
|
this._key = key;
|
||
|
|
if (key.length > blocksize) {
|
||
|
|
var hash = alg === 'rmd160' ? new RIPEMD160() : sha(alg);
|
||
|
|
key = hash.update(key).digest();
|
||
|
|
}
|
||
|
|
else if (key.length < blocksize) {
|
||
|
|
key = Buffer.concat([key, ZEROS], blocksize);
|
||
|
|
}
|
||
|
|
var ipad = this._ipad = Buffer.allocUnsafe(blocksize);
|
||
|
|
var opad = this._opad = Buffer.allocUnsafe(blocksize);
|
||
|
|
for (var i = 0; i < blocksize; i++) {
|
||
|
|
ipad[i] = key[i] ^ 0x36;
|
||
|
|
opad[i] = key[i] ^ 0x5C;
|
||
|
|
}
|
||
|
|
this._hash = alg === 'rmd160' ? new RIPEMD160() : sha(alg);
|
||
|
|
this._hash.update(ipad);
|
||
|
|
}
|
||
|
|
inherits(Hmac, Base);
|
||
|
|
Hmac.prototype._update = function (data) {
|
||
|
|
this._hash.update(data);
|
||
|
|
};
|
||
|
|
Hmac.prototype._final = function () {
|
||
|
|
var h = this._hash.digest();
|
||
|
|
var hash = this._alg === 'rmd160' ? new RIPEMD160() : sha(this._alg);
|
||
|
|
return hash.update(this._opad).update(h).digest();
|
||
|
|
};
|
||
|
|
export default (function createHmac(alg, key) {
|
||
|
|
alg = alg.toLowerCase();
|
||
|
|
if (alg === 'rmd160' || alg === 'ripemd160') {
|
||
|
|
return new Hmac('rmd160', key);
|
||
|
|
}
|
||
|
|
if (alg === 'md5') {
|
||
|
|
return new Legacy(md5, key);
|
||
|
|
}
|
||
|
|
return new Hmac(alg, key);
|
||
|
|
});
|