(C) Streaming Decrypt HTTP Response

If the an encrypted file was previously uploaded, this example demonstrates how to download and decrypt in a streaming way.

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#include <C_CkRest.h>
#include <C_CkCrypt2.h>
#include <C_CkStream.h>
#include <C_CkTask.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    int responseStatusCode;
    const char *errResponse;
    HCkCrypt2 crypt;
    HCkStream receiveStream;
    HCkStream decryptStream;
    HCkTask decryptStreamTask;

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

    rest = CkRest_Create();

    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"chilkatdownload.com",port,bTls,bAutoReconnect);

    // Send the request to download a file.
    success = CkRest_SendReqNoBody(rest,"GET","/9.5.0.83/chilkat-9.5.0-python-3.8-x64.zip");
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    // Read the response header.
    responseStatusCode = CkRest_ReadResponseHeader(rest);
    if (responseStatusCode < 0) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    printf("Response status code = %d\n",responseStatusCode);

    // We expect a 200 response status if the JPG data is coming.
    // Otherwise, we'll get a string response body with an error message(or no response body).
    if (responseStatusCode != 200) {
        errResponse = CkRest_readRespBodyString(rest);
        if (CkRest_getLastMethodSuccess(rest) != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
        }
        else {
            printf("%s\n",errResponse);
        }

        CkRest_Dispose(rest);
        return;
    }

    // Create an object for decrypting.
    // This example will use "none" for the encryption algorithm, which means it's just a pass-through.
    // Typically you would set the decrypt properties, such as secret key, IV, key length, padding scheme, cipher mode..
    crypt = CkCrypt2_Create();
    CkCrypt2_putCryptAlgorithm(crypt,"none");

    // The following settings are ignored in this test because our CryptAlgorithm is "none".
    // However, if you were truly decrypting, you might set CryptAlgorithm = "aes".
    CkCrypt2_putCipherMode(crypt,"cbc");
    CkCrypt2_putKeyLength(crypt,128);
    CkCrypt2_SetEncodedKey(crypt,"000102030405060708090A0B0C0D0E0F","hex");
    CkCrypt2_SetEncodedIV(crypt,"000102030405060708090A0B0C0D0E0F","hex");

    receiveStream = CkStream_Create();
    // The decryptStream's source will be the receiveStream.
    decryptStream = CkStream_Create();

    // The decrypt stream's sink will be a file.
    CkStream_putSinkFile(decryptStream,"qa_output/chilkat-9.5.0-python-3.8-x64.zip");
    CkStream_SetSourceStream(decryptStream,receiveStream);

    // Create and run a background async task to decrypt incoming data and write to a file.
    decryptStreamTask = CkCrypt2_DecryptStreamAsync(crypt,decryptStream);
    success = CkTask_Run(decryptStreamTask);

    success = CkRest_ReadRespBodyStream(rest,receiveStream,TRUE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkCrypt2_Dispose(crypt);
        CkStream_Dispose(receiveStream);
        CkStream_Dispose(decryptStream);
        return;
    }

    printf("Successfully received the .zip file.\n");


    CkRest_Dispose(rest);
    CkCrypt2_Dispose(crypt);
    CkStream_Dispose(receiveStream);
    CkStream_Dispose(decryptStream);

    }