(MFC) Decrypt a .p7m File (using a PFX)

MFC sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const char *pfxPath = "myCertAndKey.pfx";
    const char *pfxPassword = "test123";

    bool success = crypt.AddPfxSourceFile(pfxPath,pfxPassword);
    if (success != true) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Set the  outPath to whatever is appropriate.
    // If you are decrypting a PDF, your output might be "out.pdf"...
    const char *inPath = "smime.p7m";
    const char *outPath = "original.txt";

    // Indicate that we're doing public key decryption (i.e. PKCS7)
    crypt.put_CryptAlgorithm("pki");

    success = crypt.CkDecryptFile(inPath,outPath);
    if (success == false) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }