(Unicode C) 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
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#include <C_CkCrypt2W.h>
#include <C_CkFileAccessW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    const wchar_t *ivHex;
    const wchar_t *keyHex;
    const wchar_t *dataFile;
    const wchar_t *outFile;
    const wchar_t *outFile2;
    HCkFileAccessW fac;
    BOOL bEqual;

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

    crypt = CkCrypt2W_Create();

    CkCrypt2W_putCryptAlgorithm(crypt,L"aes");
    CkCrypt2W_putCipherMode(crypt,L"cbc");
    CkCrypt2W_putKeyLength(crypt,128);
    CkCrypt2W_putPaddingScheme(crypt,0);

    ivHex = L"000102030405060708090A0B0C0D0E0F";
    CkCrypt2W_SetEncodedIV(crypt,ivHex,L"hex");

    keyHex = L"00010203040506071011121314151617";
    CkCrypt2W_SetEncodedKey(crypt,keyHex,L"hex");

    dataFile = L"qa_data/zips/HBIQ040615300005.ZIP";
    outFile = L"qa_output/HBIQ040615300005.enc";
    outFile2 = L"qa_output/HBIQ040615300005.ZIP";

    success = CkCrypt2W_CkEncryptFile(crypt,dataFile,outFile);
    success = CkCrypt2W_CkDecryptFile(crypt,outFile,outFile2);

    fac = CkFileAccessW_Create();
    bEqual = CkFileAccessW_FileContentsEqual(fac,dataFile,outFile2);
    if (bEqual != TRUE) {
        wprintf(L"Decrypted file not equal to the original.\n");
    }
    else {
        wprintf(L"Success.\n");
    }



    CkCrypt2W_Dispose(crypt);
    CkFileAccessW_Dispose(fac);

    }