C

Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

See more OpenSSL Examples

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkCert cert;
    HCkBinData bd;
    HCkPrivateKey privKey;
    HCkCrypt2 crypt;

    success = FALSE;

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

    // Duplicates the following openssl command:
    // openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

    cert = CkCert_Create();
    success = CkCert_LoadFromFile(cert,"qa_data/openssl/EE.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    bd = CkBinData_Create();
    success = CkBinData_LoadFile(bd,"qa_data/openssl/EE.key");
    // Assuming success..

    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadAnyFormat(privKey,bd,"");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bd);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    crypt = CkCrypt2_Create();
    success = CkCrypt2_SetDecryptCert2(crypt,cert,privKey);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bd);
        CkPrivateKey_Dispose(privKey);
        CkCrypt2_Dispose(crypt);
        return;
    }

    CkCrypt2_putCryptAlgorithm(crypt,"PKI");
    success = CkCrypt2_CkDecryptFile(crypt,"qa_data/openssl/hello.txt.enc","qa_output/hello.txt");
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bd);
        CkPrivateKey_Dispose(privKey);
        CkCrypt2_Dispose(crypt);
        return;
    }

    printf("Success.\n");


    CkCert_Dispose(cert);
    CkBinData_Dispose(bd);
    CkPrivateKey_Dispose(privKey);
    CkCrypt2_Dispose(crypt);

    }