(MFC) Encrypt / Decrypt a File and Verify it has not Changed

Demonstrates how to encrypt and decrypt a file, and verify it has not changed.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    bool success;
    CkCrypt2 crypt;

    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(128);
    crypt.put_PaddingScheme(0);

    const char *ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");

    const char *keyHex = "00010203040506071011121314151617";
    crypt.SetEncodedKey(keyHex,"hex");

    const char *dataFile = "qa_data/zips/HBIQ040615300005.ZIP";
    const char *outFile = "qa_output/HBIQ040615300005.enc";
    const char *outFile2 = "qa_output/HBIQ040615300005.ZIP";

    success = crypt.CkEncryptFile(dataFile,outFile);
    success = crypt.CkDecryptFile(outFile,outFile2);

    CkFileAccess fac;
    bool bEqual = fac.FileContentsEqual(dataFile,outFile2);
    if (bEqual != true) {
        strOut.append("Decrypted file not equal to the original.");
        strOut.append("\r\n");
    }
    else {
        strOut.append("Success.");
        strOut.append("\r\n");
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }