在Javascript中加密，使用PKCS＃1解密PHP

Question

I have trying to do encryption/decryption in Javascript/PHP using PKCS#1. I have the following variables:

e: Public exponent (for encryption)
d: Private exponent (for decryption)
n: modulus

I am using this javascript library to decrypt: http://www-cs-students.stanford.edu/~tjw/jsbn/rsa.js like this:

    var rsa = new RSAKey();

    rsa.setPublic(n, e);

    var cipherText = rsa.encrypt(plainText);

To decrypt in PHP I use PHPSec library:

Question1: How do I convert from d and n to a private key to be used in phpseclib?

Question2: How do I convert the output from the Javascript code to a form that can be used with phpseclib?

Answer 1

For javascript / PHP interoperability check out this:

http://area51.phpbb.com/phpBB/viewtopic.php?f=84&t=33024&start=0

It does PKCS#1 v2.1 RSAES-OAEP (which is supposed to offer better security than PKCS#1 v2.1 RSASSA-PKCS1-v1_5).

$rsa->loadKey( array( 'e' => new Math_BigInteger('...', 256), 'n' => new Math_BigInteger('...', 256) ) );

If that doesn't work let me know.

Alternatively, you could try this:

http://www.frostjedi.com/phpbb3/viewtopic.php?p=331621#p331621

(see the second code block)

For converting the js output to a format PHP could use... the proof of concept I linked to is passing the output to char2hex():

function char2hex(source)
{
   var hex = "";
   for (var i = 0; i < source.length; i+=1)
   {
      temp = source[i].toString(16);
      switch (temp.length)
      {
         case 1:
            temp = "0" + temp;
            break;
         case 0:
           temp = "00";
      }
      hex+= temp;
   }
   return hex;
} 

Good luck!