(MFC) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

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

See Also: Using MFC CString in Chilkat

#include <CkPrivateKey.h>
#include <CkStringBuilder.h>
#include <CkRsa.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkPrivateKey privKey;
    bool success;

    CkStringBuilder sbPem;
    sbPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",true);
    sbPem.AppendLine("MIIC .... j5A==",true);
    sbPem.AppendLine("-----END RSA PRIVATE KEY-----",true);

    success = privKey.LoadPem(sbPem.getAsString());
    if (success != true) {
        strOut.append(privKey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkRsa rsa;

    success = rsa.ImportPrivateKeyObj(privKey);
    if (success != true) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    rsa.put_EncodingMode("base64");
    const char *strSigned = rsa.openSslSignStringENC("12345678");
    strOut.append(strSigned);
    strOut.append("\r\n");

    const char *strOriginal = rsa.openSslVerifyStringENC(strSigned);
    strOut.append(strOriginal);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }