PHP hash 接口对接

最近接一个项目，需要调用对方接口生成 token 但只提供了 node 版，源代码如下

//https://blog.zhengxianjun.com/2015/05/javascript-crypto-js/
npm install crypto-js
var CryptoJS = require('crypto-js')
calSignature = function (toSign, key) {
        var hash, hex, signed;
        hash = CryptoJS.HmacSHA1(toSign, key);
        hex = hash.toString(CryptoJS.enc.Hex);
        signed = base64.encodeBase64(hex);
        return signed;
    };

var hmacSHA1 = CryptoJS.HmacSHA1("Message", "Secret Passphrase").toString(CryptoJS.enc.Hex);
console.log(hmacSHA1) ;//e90f713295ea4cc06c92c9248696ffafc5d01faf 
也可以在线测试 https://blog.zhengxianjun.com/online-tool/hash/

<script src="cryptojs/rollups/md5.js"></script>
var str = '123456';
CryptoJS.MD5(str);
<script src="cryptojs/rollups/hmac-sha1.js">
</script>
<script src="cryptojs/rollups/hmac-sha3.js">
</script>
<script src="cryptojs/rollups/hmac-sha224.js">
</script>
<script src="cryptojs/rollups/hmac-sha256.js">
</script>
var str = '123456';
var password = 'password';
 
// Hmac 相关调用前都增加了 Hmac
CryptoJS.HmacMD5(str, password);
CryptoJS.HmacRIPEMD160(str, password);
CryptoJS.HmacSHA1(str, password);

但是我们的项目是基于 PHP 于是有了

$sign = base64_encode(hash_hmac('sha1', $sign, $key)); 

果然 PHP 是最好的语言，一句话搞定。

另外说到请求对方接口的问题，对方要求传递一个 json 参数过去，比如

$url = 'xxxxx.com';
$data = ['limit' => ['start' => 0, 'end' => 5]];
$res = curlGet($url.'/api/?'.json_encode($data);

结果提示 fail Malformed HTTP request line
但是 python get 没问题

res = requests.get(url, params=data, headers=headers)

于是对参数再进行一次 base64

$res =curlGet($url.'/api/?'.base64_encode(json_encode($data));

但对方有时候接受的参数 base64 解析出错

>>> s='eyJsaW1pdCI6eyJzdGFydCI6MCwiZW5kIjo1fSwidGFibGVfbmFtZSI6Im9ubGluZV91dl9hY
2NvdW50X2lkXzFob3VyX2FuYWx5c2lzX2RhdGEiLCJmaWx0ZXJfYXJncyI6eyJ2ZmlkIjoiMTQiLCJ0a
W1lc3RhbXBfMWhvdXIiOiIyMDE4LTAxLTA1IDIwOjA0OjI2In0sImJpel9kZXMwMSI6MCwib3JkZXJfY
nkiOiJ0aW1lc3RhbXBfMWhvdXIifQ'
>>> base64.b64decode(s)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "d:\python27\lib\base64.py", line 76, in b64decode
    raise TypeError(msg)
TypeError: Incorrect padding
>>> base64.b64decode(s+'===')
'{"limit":{"start":0,"end":5}'
于是有了如下处理
def decode_base64(data):
    missing_padding = len(data) % 4
    if missing_padding != 0:
        data += b'='* (4 - missing_padding)
    return base64.decodestring(data)

传递时也改成 安全 base64

function urlsafe_b64encode($string) {
   $data = base64_encode($string);
   $data = str_replace(array('+','/','='),array('-','_',''),$data);
   return $data;
 }
function urlsafe_b64decode($string) {
   $data = str_replace(array('-','_'),array('+','/'),$string);
   $mod4 = strlen($data) % 4;
   if ($mod4) {
       $data .= substr('====', $mod4);
   }
   return base64_decode($data);
 }

$res =curlGet($url.'/api/?'.urlsafe_b64encode(json_encode($data));