(MFC) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkRsa rsa;

    // Assuming you already have a base64 modulus and exponent,
    // wrap it in XML like this:
    const char *modulus = "qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=";
    const char *exponent = "AQAB";

    CkXml xml;
    xml.put_Tag("RSAPublicKey");
    xml.NewChild2("Modulus",modulus);
    xml.NewChild2("Exponent",exponent);

    // Encrypt with the public key.
    const char *publicKey = xml.getXml();
    bool success = rsa.ImportPublicKey(publicKey);

    bool usePrivateKey = false;
    const char *plainText = "message in a bottle";

    rsa.put_EncodingMode("base64");
    const char *encryptedStrBase64 = rsa.encryptStringENC(plainText,usePrivateKey);
    strOut.append(encryptedStrBase64);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }