Reputation: 48005
This is my PHP code:
<?php
$sig_string = "GET&https%3A%2F%2Fapi.pinterest.com%2Fv3%2Fusers%2Farchimede%2Fboards%2F&client_id=987654×tamp=1391761866";
$secret = "123456";
$sig = hash_hmac("sha256", $sig_string, $secret);
echo $sig;
?>
which returns (correctly) a7918aec50919915f3cefed8622ddbe35448c8f71a54ad115828f07a05930f4c
Now, I want to translate this function inside C#. Code:
signature_base_string = "GET&https%3A%2F%2Fapi.pinterest.com%2Fv3%2Fusers%2Farchimede%2Fboards%2F&client_id=987654×tamp=1391761866";
signing_key = "123456";
var encoding = new System.Text.ASCIIEncoding();
byte[] keyByte = encoding.GetBytes(signing_key);
byte[] messageBytes = encoding.GetBytes(signature_base_string);
using (var hmacsha256 = new HMACSHA256(keyByte))
{
byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
Response.Write(Convert.ToBase64String(hashmessage));
}
but it retuns p5GK7FCRmRXzzv7YYi3b41RIyPcaVK0RWCjwegWTD0w=
Why two different results? Whats wrong in the C# code?
Upvotes: 0
Views: 768
Reputation: 5760
PHP encodes the result in hexadecimal and c# encodes that in base64. But the are same.
Change this line:
Response.Write(Convert.ToBase64String(hashmessage));
To this:
Response.Write(BitConverter.ToString(hashmessage).Replace("-", "").ToLower());
to have the result in hexadecimal encoding.
Upvotes: 4
Reputation: 2539
They are the same:
The result from .NET C# is p5GK7FCRmRXzzv7YYi3b41RIyPcaVK0RWCjwegWTD0w=
. This is a base64 string.
You can convert it to hexadecimal using this tool for example. And you'll get the same as PHP after converting:
A7918AEC50919915F3CEFED8622DDBE35448C8F71A54AD115828F07A05930F4C
Upvotes: 3