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).

C

#include <C_CkCrypt2.h>
#include <C_CkPem.h>
#include <C_CkPrivateKey.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2 crypt;
    HCkPem pem;
    HCkPrivateKey privkey;
    HCkCert cert;

    success = FALSE;

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

    crypt = CkCrypt2_Create();

    CkCrypt2_putCryptAlgorithm(crypt,"pki");

    pem = CkPem_Create();
    success = CkPem_LoadPemFile(pem,"qa_data/pem/myPem.pem","password");
    if (success == FALSE) {
        printf("%s\n",CkPem_lastErrorText(pem));
        CkCrypt2_Dispose(crypt);
        CkPem_Dispose(pem);
        return;
    }

    privkey = CkPrivateKey_Create();
    success = CkPem_PrivateKeyAt(pem,0,privkey);
    if (success == FALSE) {
        printf("%s\n",CkPem_lastErrorText(pem));
        CkCrypt2_Dispose(crypt);
        CkPem_Dispose(pem);
        CkPrivateKey_Dispose(privkey);
        return;
    }

    cert = CkCert_Create();
    success = CkPem_CertAt(pem,0,cert);
    if (success == FALSE) {
        printf("%s\n",CkPem_lastErrorText(pem));
        CkCrypt2_Dispose(crypt);
        CkPem_Dispose(pem);
        CkPrivateKey_Dispose(privkey);
        CkCert_Dispose(cert);
        return;
    }

    success = CkCrypt2_SetDecryptCert2(crypt,cert,privkey);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkPem_Dispose(pem);
        CkPrivateKey_Dispose(privkey);
        CkCert_Dispose(cert);
        return;
    }

    success = CkCrypt2_CkDecryptFile(crypt,"qa_data/infile.enc","qa_output/outfile.dat");
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkPem_Dispose(pem);
        CkPrivateKey_Dispose(privkey);
        CkCert_Dispose(cert);
        return;
    }

    printf("Success.\n");


    CkCrypt2_Dispose(crypt);
    CkPem_Dispose(pem);
    CkPrivateKey_Dispose(privkey);
    CkCert_Dispose(cert);

    }