public/jsotp-ts
public/jsotp-ts
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upd: finish OTP class

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This commit is contained in:
lancegin 2017-06-29 17:22:55 +08:00
parent aad1989a70
commit 6436b6d307
2 changed files with 41 additions and 6 deletions
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38
src/otp.js
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@ -2,6 +2,9 @@
* @module : OTP module to generate the password
* @author : Gin (gin.lance.inside@hotmail.com)
*/
const jsSHA = require("jssha");
import { Base32 } from './base32';
import { Util } from './util';
export class OTP {
/*＊
@ -22,7 +25,7 @@ export class OTP {
* only to be "sha1"
*
*/
constructor(secret, digits=6, digest="sha1") {
constructor(secret, digits=6, digest="SHA-1") {
this.secret = secret;
this.digits = digits;
this.digest = digest;
@ -41,7 +44,38 @@ export class OTP {
* @return {OTP}
*/
generate_otp(input) {
return "OTP.generate_otp";
// generate HMAC object with SHA-1 digest
let hmacObj = new jsSHA(this.digest, "BYTES");
// set hmac token
hmacObj.setHMACKey(Util.byte_secret(this.secret), "BYTES");
// hamc encode the input param
hmacObj.update(Util.int_to_bytestring(input));
// get HMAC ans
let hmac = hmacObj.getHMAC("BYTES");
// transfer hmac to Array
let hmac_a = hmac.split("");
// calculate the init offset
let offset = hmac_a[hmac_a.length - 1].charCodeAt() & 0xf;
// calculate the code
let code = (
(hmac_a[offset].charCodeAt() & 0x7f) << 24 |
(hmac_a[offset + 1].charCodeAt() & 0xff) << 16 |
(hmac_a[offset + 2].charCodeAt() & 0xff) << 8 |
(hmac_a[offset + 3].charCodeAt() & 0xff)
);
// get the init str code
let str_code = (code % 10 ** this.digits).toString();
// rjust format
str_code = Util.rjust(str_code, this.digits);
return str_code;
}
}

9
test/otp_test.js
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@ -3,12 +3,13 @@ var assert = require('assert');
describe('OTP module test', function() {
var OTP = otp.OTP;
var a = new OTP("BASE32_ENCODED_SECRET");
var a = new otp.OTP("J22U6B3WIWRRBTAV");
console.log(a.generate_otp(49957590));
describe('generate_otp() function', function() {
it("should print 'OTP.generate_otp'", function() {
assert.equal("OTP.generate_otp", a.generate_otp())
it("should print '139878'", function() {
assert.equal("139878", a.generate_otp(49957590))
});
});
});