Unicode C++

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Unicode C++

#include <CkCrypt2W.h>
#include <CkPemW.h>
#include <CkPrivateKeyW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkCrypt2W crypt;

    crypt.put_CryptAlgorithm(L"pki");

    CkPemW pem;
    success = pem.LoadPemFile(L"qa_data/pem/myPem.pem",L"password");
    if (success == false) {
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    CkPrivateKeyW privkey;
    success = pem.PrivateKeyAt(0,privkey);
    if (success == false) {
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    CkCertW cert;
    success = pem.CertAt(0,cert);
    if (success == false) {
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    success = crypt.SetDecryptCert2(cert,privkey);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    success = crypt.CkDecryptFile(L"qa_data/infile.enc",L"qa_output/outfile.dat");
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");
    }