(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_CkCrypt2.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2 crypt;
    const char *ivHex;
    const char *keyHex;
    const char *dataFile;
    const char *outFile;
    const char *outFile2;
    HCkFileAccess fac;
    BOOL bEqual;

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

    crypt = CkCrypt2_Create();

    CkCrypt2_putCryptAlgorithm(crypt,"aes");
    CkCrypt2_putCipherMode(crypt,"cbc");
    CkCrypt2_putKeyLength(crypt,128);
    CkCrypt2_putPaddingScheme(crypt,0);

    ivHex = "000102030405060708090A0B0C0D0E0F";
    CkCrypt2_SetEncodedIV(crypt,ivHex,"hex");

    keyHex = "00010203040506071011121314151617";
    CkCrypt2_SetEncodedKey(crypt,keyHex,"hex");

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

    success = CkCrypt2_CkEncryptFile(crypt,dataFile,outFile);
    success = CkCrypt2_CkDecryptFile(crypt,outFile,outFile2);

    fac = CkFileAccess_Create();
    bEqual = CkFileAccess_FileContentsEqual(fac,dataFile,outFile2);
    if (bEqual != TRUE) {
        printf("Decrypted file not equal to the original.\n");
    }
    else {
        printf("Success.\n");
    }



    CkCrypt2_Dispose(crypt);
    CkFileAccess_Dispose(fac);

    }