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Unicode C++ Examples

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(Unicode C++) Encrypt File in Chunks using AES CBC

Demonstrates how to use the FirstChunk/LastChunk properties to encrypt a file chunk-by-chunk.

Important This example requires Chilkat v9.5.0.68 or later.

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#include <CkCrypt2W.h>
#include <CkFileAccessW.h>
#include <CkBinDataW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat Crypt API to have been previously unlocked.
    // See Unlock Chilkat Crypt for sample code.

    CkCrypt2W crypt;

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

    crypt.SetEncodedKey(L"000102030405060708090A0B0C0D0E0F",L"hex");
    crypt.SetEncodedIV(L"000102030405060708090A0B0C0D0E0F",L"hex");

    const wchar_t *fileToEncrypt = L"qa_data/hamlet.xml";
    CkFileAccessW facIn;
    bool success = facIn.OpenForRead(fileToEncrypt);
    if (success != true) {
        wprintf(L"Failed to open file that is to be encrytped.\n");
        return;
    }

    const wchar_t *outputEncryptedFile = L"qa_output/hamlet.enc";
    CkFileAccessW facOutEnc;
    success = facOutEnc.OpenForWrite(outputEncryptedFile);
    if (success != true) {
        wprintf(L"Failed to encrypted output file.\n");
        return;
    }

    // Let's encrypt in 10000 byte chunks.
    int chunkSize = 10000;
    int numChunks = facIn.GetNumBlocks(chunkSize);

    crypt.put_FirstChunk(true);
    crypt.put_LastChunk(false);

    CkBinDataW bd;

    int i = 0;
    while (i < numChunks) {
        i = i + 1;
        if (i == numChunks) {
            crypt.put_LastChunk(true);
        }

        // Read the next chunk from the file.
        // The last chunk will be whatever amount remains in the file..
        bd.Clear();
        facIn.FileReadBd(chunkSize,bd);

        // Encrypt.
        crypt.EncryptBd(bd);

        // Write the encrypted chunk to the output file.
        facOutEnc.FileWriteBd(bd,0,0);

        crypt.put_FirstChunk(false);
    }

    // Make sure both FirstChunk and LastChunk are restored to true after
    // encrypting or decrypting in chunks.  Otherwise subsequent encryptions/decryptions
    // will produce unexpected results.
    crypt.put_FirstChunk(true);
    crypt.put_LastChunk(true);

    facIn.FileClose();
    facOutEnc.FileClose();

    // Decrypt the encrypted output file in a single call using CBC mode:
    const wchar_t *decryptedFile = L"qa_output/hamlet_dec.xml";
    success = crypt.CkDecryptFile(outputEncryptedFile,decryptedFile);
    // Assume success for the example..

    // Compare the contents of the decrypted file with the original file:
    bool bSame = facIn.FileContentsEqual(fileToEncrypt,decryptedFile);
    wprintf(L"bSame = %d\n",bSame);
    }

 

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