How to decrypt a .net encrypted string in php

Question

I am Encrypting a string in c# and sending this to a php page like this.

sfplr.Attributes.Add("href", "http://sml.com.pk/a/sfpl/reports.php?id=" + Convert.ToBase64String(Encoding.Unicode.GetBytes(emailid)));

and the url genrated from this code is like this

http://sml.com.pk/a/sfpl/reports.php?id=bQBhAGwAaQBrAC4AYQBkAGUAZQBsAEAAcwBoAGEAawBhAHIAZwBhAG4AagAuAGMAbwBtAC4AcABrAA==

Now I want to decrypt again this bQBhAGwAaQBrAC4AYQBkAGUAZQBsAEAAcwBoAGEAawBhAHIAZwBhAG4AagAuAGMAbwBtAC4AcABrAA== in php o display in php page.Please any one help me to do this

Malik, the email will not be encrypted, so you can send it as plain text (maybe with some url-encoding, so that it's safe to be put in an url) — SWeko
– SWeko, Commented Nov 27, 2012 at 9:39

Dr. Dan · Accepted Answer · 2012-11-27 09:38:51Z

2

Try using base64_decode function

Reference http://php.net/manual/en/function.base64-decode.php

In your case, it will be:

<?php    
    echo base64_decode($_GET['id']);
?>

edited Nov 27, 2012 at 9:38

answered Nov 27, 2012 at 9:32

Dr. Dan

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3 Comments

user1820339 Over a year ago

and how to get query string from asp.net page?

user1820339 Over a year ago

yes i Got Thanks and wait for 5 minutes to accepted ur answer

chris Over a year ago

Again, note that base64 encoding is NOT encryption. And NEVER EVER transfer sensitive information over GET parameters. Not even over HTTPS.

Community · Accepted Answer · 2017-05-23 12:12:23Z

2

$email =  base64_decode("bQBhAGwAaQBrAC4AYQBkAGUAZQBsAEAAcwBoAGEAawBhAHIAZwBhAG4AagAuAGMAbwBtAC4AcABrAA==");
echo $email;  //****** You will get email here... */

Please refer Is "convert.tobase64string" in .Net equal to "base64_encode" in PHP?

edited May 23, 2017 at 12:12

CommunityBot

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answered Nov 27, 2012 at 9:36

Miqdad Ali

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Comments

Daneo · Accepted Answer · 2012-11-27 09:55:58Z

Using the base64_decode function will return the bytes you originally passed into the convert.toBase64String .

After that you'll have to retreive them in the following way :

<?php $emailBytes = base64_decode($_GET['id']); ?>

That will return, if it has been serialized correctly, the array you made in C# by using the Convert.toBase64String, see Encoding.getBytes.

Meaning, if the array is passed as you expected it to be (which I doubt)

$msg = "";
foreach ($emailBytes as $character) {
    $msg .= (char) $character;
}

I doubt you even need the Encoding.getBytes , you can just past a string as an argument.

In C# use

Convert.ToBase64String(emailid);

And then all you'd have to do in php is the retrieval in the way I first mentioned, that will give you the original passed String.

Also, as pointed out several times, that is an encryption you're performing, it's just making sure that it can be passed in the URL in a way no conflicts occur.

If you do want to encrypt, use a library on the C# side, encode the message, base64 encode it. Then on PHP side you'd have to do the reverse.

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