What is the equivalent this code in C#

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I dont know PHP and I am stucking at one Position can anybody help me.

I have a code in PHP.

function signUrl($url, $key, $secret, $timestamp) {
    $request_type = 'GET';
    $content_type = '';
    $content_body = '';
    $content_digest = base64_encode(pack('H*', md5($content_body)));

    $request_array = array($request_type, $content_type, $content_digest, $url, $timestamp);
    $request_string = implode(',', $request_array);

    $signature = hash_hmac('sha256', $request_string, $secret, false);

    $signed_url = "{$url}&signature={$signature}";
    return $signed_url;
}

What I have tried:

Any help would be appreciated

Posted 26-Mar-18 1:10am

Gaurav_Chaudhary

Updated 4-Apr-18 2:43am

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2 solutions

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Gaurav_Chaudhary · Accepted Answer · 2018-04-04T02:44:00

private string CreateToken(string message, string secret)
       {
           ASCIIEncoding encoding = new ASCIIEncoding();
           byte[] keyBytes = encoding.GetBytes(secret);
           byte[] messageBytes = encoding.GetBytes(message);
           System.Security.Cryptography.HMACSHA256 cryptographer = new System.Security.Cryptography.HMACSHA256(keyBytes);

           byte[] bytes = cryptographer.ComputeHash(messageBytes);

           return BitConverter.ToString(bytes).Replace("-", "").ToLower();

       }


       public static string CreateMD5(string input)
       {
           using (MD5 md5 = MD5.Create())
           {
               byte[] bPayload = Encoding.UTF8.GetBytes(input);
               byte[] bPayloadHash = md5.ComputeHash(bPayload);

               return Convert.ToBase64String(bPayloadHash);
           }
       }

Jochen Arndt · Accepted Answer · 2018-03-26T02:19:00

Solution 1

Lookup what the PHP functions are doing and find the corresponding C# methods:

PHP: md5 - Manual[^]: Calculate the md5 hash of a string: use the System.Security.Cryptography.MD5 class

PHP: pack - Manual[^]: With "H*" it is like the Text.Encoding.ASCII.GetBytes() method

PHP: base64_encode - Manual[^]: Encodes data with MIME base64: use the Convert.ToBase64String() method

PHP: array - Manual[^]: Create an array

PHP: implode - Manual[^]: Join array elements with a string: String.Join()

PHP: hash_hmac - Manual[^]: Generate a keyed hash value using the HMAC method: use the System.Security.Cryptography.HMACSHA256 class

The last line formats the string to be returned: String.Format()

Posted 26-Mar-18 2:19am

Jochen Arndt

Comments

[no name] 4-Apr-18 8:42am

Thanks

private string CreateToken(string message, string secret)
{
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] keyBytes = encoding.GetBytes(secret);
byte[] messageBytes = encoding.GetBytes(message);
System.Security.Cryptography.HMACSHA256 cryptographer = new System.Security.Cryptography.HMACSHA256(keyBytes);

byte[] bytes = cryptographer.ComputeHash(messageBytes);

return BitConverter.ToString(bytes).Replace("-", "").ToLower();

}

public static string CreateMD5(string input)
{
using (MD5 md5 = MD5.Create())
{
byte[] bPayload = Encoding.UTF8.GetBytes(input);
byte[] bPayloadHash = md5.ComputeHash(bPayload);

return Convert.ToBase64String(bPayloadHash);
}
}