Swift Requires Chilkat v11.0.0+

Duplicate PHP RSA Encryption

See more RSA Examples

Demonstrates how to duplicate the following PHP function. Swift

func chilkatTest() {
    var success: Bool = 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
    var rsaMOD: String? = "F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"

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

    //  Get the RSA modulus and exponent in base64.
    let bdMod = CkoBinData()!
    let bdExp = CkoBinData()!
    success = bdMod.appendEncoded(encData: rsaMOD, encoding: "hex")
    success = bdExp.appendEncoded(encData: rsaEXP, encoding: "hex")

    //  Build the XML representation of the RSA public key
    let xml = CkoXml()!
    xml.tag = "RSAPublicKey"
    xml.updateChildContent(tagPath: "Modulus", value: bdMod.getEncoded(encoding: "base64"))
    xml.updateChildContent(tagPath: "Exponent", value: bdExp.getEncoded(encoding: "base64"))

    //  Load the RSA public key into a Chilkat public key object.
    let pubkey = CkoPublicKey()!
    success = pubkey.load(fromString: xml.getXml())

    //  Setup the RSA object for encryption and do it..
    let rsa = CkoRsa()!
    rsa.verboseLogging = true
    success = rsa.usePublicKey(pubKey: pubkey)

    //  Use PKCSv1.5 padding
    rsa.pkcsPadding = true

    //  Encrypt and return the string as hex.
    rsa.encodingMode = "hex"
    var plainText: String? = "key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
    var cipherText: String? = rsa.encryptStringENC(str: plainText, bUsePrivateKey: false)
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    //  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.
    print("\(cipherText!)")

}