PHP和Golang中的hmac哈希不匹配

Question

I am trying to connect to an API that uses an outdated hmac hash authentication mechanism for the API's.

For an instance:

$signature = hash_hmac('sha256', $string_to_sign, $api_sec);

vs the one generated in Go:

h := hmac.New(sha256.New, []byte(authSecret))
h.Write([]byte(stringToSign))
signature := hex.EncodeToString(h.Sum(nil))

When I use the same stringToSign($string_to_sign) and same authSecret($api_sec) the signature generated with Go results as an invalid signature for the API. But if I create the same with the PHP function it works fine. I am a bit lost as to where to look.

Answer 1

There must be an issue with your input data.

Using the below PHP:

echo hash_hmac('sha256', 'data', 'key');

And the below Go:

h := hmac.New(sha256.New, []byte("key"))
h.Write([]byte("data"))
signature := hex.EncodeToString(h.Sum(nil))
fmt.Println(signature)

I get the same result of 5031fe3d989c6d1537a013fa6e739da23463fdaec3b70137d828e36ace221bd0