Create PKCS7 Signature using .cer and .key Files

Uses a digital certificate (.cer file) and private key file to create a PKCS7 signature.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

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

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    HCkPrivateKey privKey;
    const char * password;
    HCkCrypt2 crypt;
    HCkByteData pkcs7;
    const char * textToSign;

    //  First, load the .cer and .key files into Chilkat objects...
    cert = CkCert_Create();

    success = CkCert_LoadFromFile(cert,"myCert.cer");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        return;
    }

    privKey = CkPrivateKey_Create();

    password = "myPassword";
    //  The private key object provides different methods for
    //  loading keys of many different formats.
    //  This example loads a PKCS8 encrypted private key.
    success = CkPrivateKey_LoadPkcs8EncryptedFile(privKey,"myPrivateKey.key",password);
    if (success != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        return;
    }

    //  NOTE:  In this example, the .cer should contain the public key
    //  that corresponds to the private key.

    crypt = CkCrypt2_Create();

    //  Any string argument automatically begins the 30-day trial.
    success = CkCrypt2_UnlockComponent(crypt,"30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    //  Set the certifcate + private key to be used for signing:
    CkCrypt2_SetSigningCert2(crypt,cert,privKey);

    pkcs7 = CkByteData_Create();

    textToSign = "This is the text to be signed.";
    success = CkCrypt2_SignString(crypt,textToSign,pkcs7);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        return;
    }

    //  Save the PKCS7 signature to a file.
    success = CkByteData_saveFile(pkcs7,"out_pkcs7.p7s");
    if (success == FALSE) {
        printf("Failed to save output file.\n");
    }
    else {
        printf("Success.\n");
    }


    CkCert_Dispose(cert);
    CkPrivateKey_Dispose(privKey);
    CkCrypt2_Dispose(crypt);
    CkByteData_Dispose(pkcs7);

    }