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 <C_CkCrypt2W.h>
#include <C_CkPemW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    HCkPemW pem;
    HCkPrivateKeyW privkey;
    HCkCertW cert;

    success = FALSE;

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

    crypt = CkCrypt2W_Create();

    CkCrypt2W_putCryptAlgorithm(crypt,L"pki");

    pem = CkPemW_Create();
    success = CkPemW_LoadPemFile(pem,L"qa_data/pem/myPem.pem",L"password");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPemW_lastErrorText(pem));
        CkCrypt2W_Dispose(crypt);
        CkPemW_Dispose(pem);
        return;
    }

    privkey = CkPrivateKeyW_Create();
    success = CkPemW_PrivateKeyAt(pem,0,privkey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPemW_lastErrorText(pem));
        CkCrypt2W_Dispose(crypt);
        CkPemW_Dispose(pem);
        CkPrivateKeyW_Dispose(privkey);
        return;
    }

    cert = CkCertW_Create();
    success = CkPemW_CertAt(pem,0,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPemW_lastErrorText(pem));
        CkCrypt2W_Dispose(crypt);
        CkPemW_Dispose(pem);
        CkPrivateKeyW_Dispose(privkey);
        CkCertW_Dispose(cert);
        return;
    }

    success = CkCrypt2W_SetDecryptCert2(crypt,cert,privkey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkPemW_Dispose(pem);
        CkPrivateKeyW_Dispose(privkey);
        CkCertW_Dispose(cert);
        return;
    }

    success = CkCrypt2W_CkDecryptFile(crypt,L"qa_data/infile.enc",L"qa_output/outfile.dat");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkPemW_Dispose(pem);
        CkPrivateKeyW_Dispose(privkey);
        CkCertW_Dispose(cert);
        return;
    }

    wprintf(L"Success.\n");


    CkCrypt2W_Dispose(crypt);
    CkPemW_Dispose(pem);
    CkPrivateKeyW_Dispose(privkey);
    CkCertW_Dispose(cert);

    }