Unicode 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. Unicode C++

#include <CkCertStoreW.h>
#include <CkJsonObjectW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.h>
#include <CkRsaW.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.)
    CkCertStoreW certStore;

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

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

    CkCertW cert;
    success = certStore.FindCert(jsonCN,cert);
    if (success == false) {
        wprintf(L"%s\n",certStore.lastErrorText());
        return;
    }

    CkPrivateKeyW privKey;
    success = cert.GetPrivateKey(privKey);
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkRsaW rsa;

    success = rsa.UsePrivateKey(privKey);
    if (success == false) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

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

    const wchar_t *strData = L"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 wchar_t *hexSig = rsa.signStringENC(strData,L"sha-1");

    wprintf(L"%s\n",hexSig);

    wprintf(L"Success!\n");
    }