(MFC) Load RSA Public Key from Hex Modulus and Exponent

Load an RSA public key from a hex modulus and exponent.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    bool success;

    // Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
    const char *modulus = "BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429";

    const char *exponent = "00000003";

    // We'll need to re-encode from hex to base64..
    CkBinData bdModulus;
    bdModulus.AppendEncoded(modulus,"hex");
    CkBinData bdExponent;
    bdExponent.AppendEncoded(exponent,"hex");

    CkXml xml;
    xml.put_Tag("RsaKeyValue");
    xml.NewChild2("Modulus",bdModulus.getEncoded("base64"));
    xml.NewChild2("Exponent",bdExponent.getEncoded("base64"));

    // Now load into the pubkey object..
    CkPublicKey pubkey;
    success = pubkey.LoadFromString(xml.getXml());
    if (success == false) {
        strOut.append(pubkey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }