C++

Duplicate PHP RSA Encryption

See more RSA Examples

Demonstrates how to duplicate the following PHP function. C++

#include <CkBinData.h>
#include <CkXml.h>
#include <CkPublicKey.h>
#include <CkRsa.h>

void ChilkatSample(void)
    {
    bool 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
    const char *rsaMOD = "F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673";

    // The RSA exponent in hex is "010001", which is 65537 in decimal.  It's typically the exponent that is always used.
    const char *rsaEXP = "010001";

    // Get the RSA modulus and exponent in base64.
    CkBinData bdMod;
    CkBinData bdExp;
    success = bdMod.AppendEncoded(rsaMOD,"hex");
    success = bdExp.AppendEncoded(rsaEXP,"hex");

    // Build the XML representation of the RSA public key
    CkXml xml;
    xml.put_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.
    CkPublicKey pubkey;
    success = pubkey.LoadFromString(xml.getXml());

    // Setup the RSA object for encryption and do it..
    CkRsa rsa;
    rsa.put_VerboseLogging(true);
    success = rsa.UsePublicKey(pubkey);

    // Use PKCSv1.5 padding
    rsa.put_PkcsPadding(true);

    // Encrypt and return the string as hex.
    rsa.put_EncodingMode("hex");
    const char *plainText = "key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678";
    const char *cipherText = rsa.encryptStringENC(plainText,false);
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        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.
    std::cout << cipherText << "\r\n";
    }