C++

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. C++

#include <CkCertStore.h>
#include <CkJsonObject.h>
#include <CkCert.h>
#include <CkPrivateKey.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.

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    CkCertStore certStore;

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    success = certStore.LoadPfxFile("chilkat.pfx","test");
    if (success == false) {
        std::cout << certStore.lastErrorText() << "\r\n";
        return;
    }

    // Find the certificate by the subject common name:
    CkJsonObject jsonCN;
    jsonCN.UpdateString("CN","cert common name");

    CkCert cert;
    success = certStore.FindCert(jsonCN,cert);
    if (success == false) {
        std::cout << certStore.lastErrorText() << "\r\n";
        return;
    }

    CkPrivateKey privKey;
    success = cert.GetPrivateKey(privKey);
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkRsa rsa;

    success = rsa.UsePrivateKey(privKey);
    if (success == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    // Encode the signature as a hex string
    rsa.put_EncodingMode("hex");

    const char *strData = "This is the string to be signed.";

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    const char *hexSig = rsa.signStringENC(strData,"sha-1");

    std::cout << hexSig << "\r\n";

    std::cout << "Success!" << "\r\n";
    }