Xojo Plugin Requires Chilkat v11.0.0+

Duplicate PHP RSA Encryption

See more RSA Examples

Demonstrates how to duplicate the following PHP function. Xojo Plugin

Dim success As Boolean
success = False

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Duplicate the following PHP code:
//  
//     public function encryptRSA($plainText,$rsaMOD,$pubKEY){
//          $rsa  = new RSA();
//          $rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1);
//          $publicKey = [
//              'e' => new BigInteger($pubKEY,16),
//              'n' => new BigInteger($rsaMOD,16)
//          ];
//  		
//          $rsa->loadKey($publicKey);
//          $ciphertext = $rsa->encrypt($plainText);
//          return bin2hex($ciphertext);
//      }
//  
//      $plainText="key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
//      $rsaMOD="F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"
//      $pubKEY="010001"

//  We have the RSA modulus in hex
Dim rsaMOD As String
rsaMOD = "F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"

//  The RSA exponent in hex is "010001", which is 65537 in decimal.  It's typically the exponent that is always used.
Dim rsaEXP As String
rsaEXP = "010001"

//  Get the RSA modulus and exponent in base64.
Dim bdMod As New Chilkat.BinData
Dim bdExp As New Chilkat.BinData
success = bdMod.AppendEncoded(rsaMOD,"hex")
success = bdExp.AppendEncoded(rsaEXP,"hex")

//  Build the XML representation of the RSA public key
Dim xml As New Chilkat.Xml
xml.Tag = "RSAPublicKey"
xml.UpdateChildContent "Modulus",bdMod.GetEncoded("base64")
xml.UpdateChildContent "Exponent",bdExp.GetEncoded("base64")

//  Load the RSA public key into a Chilkat public key object.
Dim pubkey As New Chilkat.PublicKey
success = pubkey.LoadFromString(xml.GetXml())

//  Setup the RSA object for encryption and do it..
Dim rsa As New Chilkat.Rsa
rsa.VerboseLogging = True
success = rsa.UsePublicKey(pubkey)

//  Use PKCSv1.5 padding
rsa.PkcsPadding = True

//  Encrypt and return the string as hex.
rsa.EncodingMode = "hex"
Dim plainText As String
plainText = "key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
Dim cipherText As String
cipherText = rsa.EncryptStringENC(plainText,False)
If (rsa.LastMethodSuccess = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

//  Note: The PKCSv1_5 padding incorporates random bytes.  Therefore, the RSA encryption will produce different results each time -- all of which are valid 
//  and decrypt correctly to the same original text.
System.DebugLog(cipherText)