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C++ Examples

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(C++) Convert RSA Private Key to Public Key

Demonstrates how to get a public RSA key from a private RSA key.

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#include <CkPrivateKey.h>
#include <CkPublicKey.h>

void ChilkatSample(void)
    {
    CkPrivateKey key;

    //  Step 1: Load the private key from a source.
    //  (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
    //  see the online reference documentation for more options.)
    bool success = key.LoadPemFile("qa_data/pem/VP_Private.pem");
    if (success != true) {
        std::cout << key.lastErrorText() << "\r\n";
        return;
    }

    //  Step 2: Get the public key object from the private key object.
    CkPublicKey *pubKey = key.GetPublicKey();
    if (key.get_LastMethodSuccess() != true) {
        std::cout << key.lastErrorText() << "\r\n";
        return;
    }

    //  Step 3: Save the public key in a desired format.
    //  (Chilkat can load or save public and private keys in many different formats.  See
    //  the online reference documentation for more options.)

    //  Saves to a PKCS8 PEM file.
    bool bPreferPkcs1 = false;
    success = pubKey->SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem");
    if (pubKey->get_LastMethodSuccess() != true) {
        std::cout << pubKey->lastErrorText() << "\r\n";
        return;
    }

    delete pubKey;

    std::cout << "Extracted and saved public key from private key." << "\r\n";
    }

 

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