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(MFC) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat
The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
  1. Creates a SHA256 digest of the contents of the input file
  2. Signs the SHA256 digest using the private key.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

// Needs #include <CkPrivateKey.h>
// Needs #include <CkByteData.h>
// Needs #include <CkRsa.h>

    CkString strOut;

    bool success;

    CkPrivateKey pkey;

    //  Load the private key from an PEM file:
    success = pkey.LoadPemFile("private.pem");
    if (success != true) {
        strOut.append(pkey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Load the file to be signed.
    CkByteData inData;
    success = inData.loadFile("in.dat");
    if (success != true) {
        strOut.append("Failed to load input data.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkRsa rsa;

    //  Any string argument automatically begins the 30-day trial.
    success = rsa.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Import the private key into the RSA component:
    success = rsa.ImportPrivateKeyObj(pkey);
    if (success != true) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  OpenSSL uses big-endian...
    rsa.put_LittleEndian(false);

    CkByteData sigData;
    success = rsa.SignBytes(inData,"sha256",sigData);
    if (success != true) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Save the binary signature to a file.
    success = sigData.saveFile("signature.sig");
    if (success != true) {
        strOut.append("Failed to save signature file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

 

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