RSA Encryption?

[FaridAgl]

I have this private key:

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

And all I know is that I have to encrypt some buffer with this private key (Yes, private key should be used for decryption, not encryption, I guess, but the protocol I am trying to implement works this way.).

Any help would be really great as I'm stucked on this about 2 days.

Thanks in advance.

[jchd]

Simple googling for "BEGIN RSA PRIVATE KEY" finds this page (for instance) which should answer your question.

[MikahS]

try google: got one on the first link: link

[FaridAgl]

Simple googling for "BEGIN RSA PRIVATE KEY" finds this page (for instance) which should answer your question.

Thanks, I tried to understand it a bit, not such help thu.

 

try google: got one on the first link: link

I did it before, couldn't find anything useful.

 

Let me ask another way, this is what I'm trying to do:

 

For the session opening, the client generates a 256-bits AES session key, and a

128-bits AES session IV (Initialisation Vector). 

 

The client sends a GSP SESSION INIT message to the server, encrypted with

the client's RSA private key (that is, encrypted with the *private* key). 

[wraithdu]

Weird they would request that, as it's not usually the way it's done. You can't even do this in .NET with standard libraries. PHP has a function to do it, or I found this .NET library someone wrote. You can try to translate it to AutoIt, but I imagine it is quite involved. He had to write his own RSA implementation.

http://www.codeproject.com/Articles/38739/RSA-Private-Key-Encryption

[FaridAgl]

Yes, you are right.

If you could help me to implement it in php, it was OK too.

Edit:

I found the php function:

http://php.net/manual/en/function.openssl-private-encrypt.php

Edited October 30, 2014 by FaridAgl

[FaridAgl]

@wraithdu

Thank you so much for showing me the right direction. I'm not sure if you are interested to help me in further steps, in case you are, here is what I came up with:

<?php
// Same as the private key provided in the first post
$file = fopen('key.private', 'r');
$privateKey = fread($file, 8192);
fclose($file);

// Loading the private key
openssl_get_privatekey($privateKey);


// Generating a 256-bit AES session key
$key = pack('h*', 'bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3');
echo 'key: ' . $key . '<br>';

// Generation a 128-bit AES session IV
$iv = pack('h*', 'e9c79b380e82c862d42bc0aba44216c0');
echo 'iv: ' . $iv . '<br>';


// Forming the message to send
$data = $key . $iv;

// Encrypting the data
openssl_private_encrypt($data, $crypted, $privateKey);


// Printing out the result which will be sent to the server
var_dump(unpack('h*', $crypted));
/*
Result:
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
*/

The server doesn't response to the request, which means I'm not sending the correct message.