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(MFC) Write PKCS1 or PKCS8 Public Key PEM

Demonstrates how to write either PKCS1 or PKCS8 format PEM files. PKCS1 public keys have this PEM format:

-----BEGIN RSA PUBLIC KEY-----
BASE64 ENCODED DATA
-----END RSA PUBLIC KEY-----
PKCS8 public keys have this PEM format:
-----BEGIN PUBLIC KEY-----
BASE64 ENCODED DATA
-----END PUBLIC KEY-----

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

// Needs #include <CkGlobal.h>
// Needs #include <CkPem.h>

    CkString strOut;

    //  Unlock the Chilkat API.
    //  Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    //  by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob;
    bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        strOut.append(chilkatGlob.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPem pem;

    //  Load a public key from a PEM file.
    //  (Assume the PEM contains at least one public key..)
    success = pem.LoadPemFile("/Users/chilkat/testData/pem/myPublicKey.pem");
    if (success != true) {
        strOut.append(pem.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int i;
    int numPublicKeys = pem.get_NumPublicKeys();
    if (numPublicKeys == 0) {
        strOut.append(("Error: Expected the PEM to contain public keys."));
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Get each public key as PEM, first in PKCS1 format, then in PKCS8.
    for (i = 1; i <= numPublicKeys; i++) {

        //  First output to PKCS1 PEM format:
        strOut.append("This is PKCS1 format:");
        strOut.append("\r\n");
        pem.put_PublicKeyFormat("pkcs1");
        strOut.append(pem.toPem());
        strOut.append("\r\n");

        //  Now PKCS8 PEM format:
        strOut.append("This is PKCS8 format:");
        strOut.append("\r\n");
        pem.put_PublicKeyFormat("pkcs8");
        strOut.append(pem.toPem());
        strOut.append("\r\n");

    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

 

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