(MFC) Generate an ECC Key (Public and Private)

Demonstrates how to generate an ECC key and save both public and private parts.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    // Create a Fortuna PRNG and seed it with system entropy.
    // This will be our source of random data for generating the ECC private key.
    CkPrng fortuna;
    const char *entropy = fortuna.getEntropy(32,"base64");
    bool success = fortuna.AddEntropy(entropy,"base64");

    CkEcc ecc;

    // Generate a random ECC private key on the secp256r1 curve.
    // Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1.

    CkPrivateKey *privKey = ecc.GenEccKey("secp256r1",fortuna);
    if (ecc.get_LastMethodSuccess() == false) {
        strOut.append(ecc.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Save the private key to PKCS8 encrypted PEM
    // (The private key can be saved in a variety of different formats. See the online reference documentation.)
    success = privKey->SavePkcs8EncryptedPemFile("pemPassword","qa_output/eccPrivKey.pem");
    if (success != true) {
        strOut.append(privKey->lastErrorText());
        strOut.append("\r\n");
    }

    delete privKey;

    // The private key PEM looks like this:

    // 	-----BEGIN ENCRYPTED PRIVATE KEY-----
    // 	MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAhUmn+1/lwCIwICCAAw
    // 	FAYIKoZIhvcNAwcECPlyNXAXZO+oBIGAIvxvTENXJWbrCwSjh0QNxLecBotUpfI5
    // 	auOonLmwVMyt1ahMmNyVo/D+pnKQSE41Fg8fApM0DCDKZUOVCCcK1qirIsMPQkGp
    // 	klPJbvrQRVYgzBtU31uNB5y2wqhrIeepal1HXBvbkUK0nfJMbcdz/XAEIQu2HhTD
    // 	t6LMScPQld4=
    // 	-----END ENCRYPTED PRIVATE KEY-----

    // Now get the public key part from the private key.
    // (A public key is actually a subset of the private key.)
    CkPublicKey *pubKey = privKey->GetPublicKey();

    // Save the public key to a PEM file.
    // (The public key can be saved in a variety of different formats. See the online reference documentation.)
    // For ECC keys, the 1st argument (bPreferPkcs1) is ignored and unused.
    bool bPreferPkcs1 = false;
    success = pubKey->SavePemFile(bPreferPkcs1,"qa_output/eccPubKey.pem");

    delete pubKey;

    // The public key PEM looks like this:

    // 	-----BEGIN PUBLIC KEY-----
    // 	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
    // 	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
    // 	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
    // 	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
    // 	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
    // 	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABGdOH8uM6SfX3mdV+TR0mWp2
    // 	gfVRPlxWxwhOiowuNByBxmQz7ZR4CJY1XcN2zkUo5pzW73ZhGwgd2XTOvqPqG40=
    // 	-----END PUBLIC KEY-----
    // 

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


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }