我正在尝试使用CryptoJS在Javascript中构建HMAC SHA256字符串,我的现有代码是使用Akamai库编写的PHP代码。
在某些情况下,与PHP相比,我得到了不同的结果,我无法理解为什么会给我不同的结果。
/*
<php> Using native hash_hmac
Generating key by concatenating char
*/
$signature1 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", chr(63));
$signature2 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", chr(63) . chr(23));
$signature3 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", chr(63) . chr(23) . chr(253));
/*
here is result from php
signature1 : 3e086bb48ab9aafa85661f9ce1b7dac49befddf117ce2a42d93c92b6abe513ce ( matched: same as JavaScript)
signature2 : 3667dd414a50f68f7ce083e540f27f68f7d0f18617b1fb1e4788bffeaeab59f6( matched: same as JavaScript)
signature3 : dd5a20041661046fdee871c8b9e77b3190fbbf85937c098090a1d524719b6aa9 ( not matched: diff from JavaScript)
*/
/*
<JavaScript> using CryptoJS
Generating key by concatenating three char
*/
var signature1 = CryptoJS.HmacSHA256("st=1453362060~exp=1453363260~acl=/*", String.fromCharCode(63));
var signature2 = CryptoJS.HmacSHA256("st=1453362060~exp=1453363260~acl=/*", String.fromCharCode(63) + String.fromCharCode(23));
var signature3 = CryptoJS.HmacSHA256("st=1453362060~exp=1453363260~acl=/*", String.fromCharCode(63) + String.fromCharCode(23) + String.fromCharCode(253));
/*
here is result from JavaScript
signature1 : 3e086bb48ab9aafa85661f9ce1b7dac49befddf117ce2a42d93c92b6abe513ce ( matched: same as php)
signature2 : 3667dd414a50f68f7ce083e540f27f68f7d0f18617b1fb1e4788bffeaeab59f6 ( matched: same as php)
signature3 : 28075dc75de9f22f83e87772f09a89efb007f2e298167686832eff122ef6eb08 ( not matched: diff from php)
*/
前两个HMAC值匹配,但当我添加第三个字符时,它产生了不同的结果,请问有人能解释一下原因吗。