Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

MFC Examples

Web API Categories

ASN.1
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
Geolocation
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text

HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(MFC) Streaming Encryption

Encrypt and decrypt using a stream.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>
#include <CkStream.h>
#include <CkStringArray.h>
#include <CkTask.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;

    // Setup encryption using the chacha20 algorithm...
    crypt.put_CryptAlgorithm("chacha20");
    crypt.put_KeyLength(256);
    crypt.put_EncodingMode("hex");
    const char *ivHex = "000000000000000000000002";
    crypt.SetEncodedIV(ivHex,"hex");
    crypt.put_InitialCount(42);
    const char *keyHex = "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0";
    crypt.SetEncodedKey(keyHex,"hex");

    const char *plainText = "The quick brown fox jumped over the lazy dog.\r\n";

    CkStream stream;

    // We'll save the encrypted output in eStrings to demonstrate streaming decryption next.
    CkStringArray eStrings;

    // Start a background task that will encrypt a stream.
    CkTask *task = crypt.EncryptStreamAsync(stream);
    bool success = task->Run();

    // Write plainText to the stream, and read chacha20 encrypted text..
    const char *cipherText = 0;
    int i;
    for (i = 1; i <= 10; i++) {
        // Note: An encryption algorithm's block size will cause buffering,
        // and therefore not every loop iteration will produce output.
        success = stream.WriteString(plainText);
        if (stream.get_DataAvailable() == true) {
            cipherText = stream.readBytesENC("hex");
            strOut.append(cipherText);
            strOut.append("\r\n");
            success = eStrings.Append(cipherText);
        }

    }

    // Tell the background task that the stream has ended.
    success = stream.WriteClose();

    // Let's make sure the background task finished.
    // It should already be the case that the task is finished.
    while ((task->get_Finished() != true)) {
        task->SleepMs(20);
    }

    // Get any remaining data available from the stream.
    if (stream.get_DataAvailable() == true) {
        cipherText = stream.readBytesENC("hex");
        strOut.append(cipherText);
        strOut.append("\r\n");
        success = eStrings.Append(cipherText);
    }

    if (task->get_TaskSuccess() != true) {
        strOut.append("async encryption failed:");
        strOut.append("\r\n");
        strOut.append(task->resultErrorText());
        strOut.append("\r\n");
        success = false;
    }

    delete task;

    strOut.append("-- encrypt finished --");
    strOut.append("\r\n");

    // Now decrypt to return the original.

    // Reset the stream object so it can be used again.
    stream.Reset();

    // Start a background task that will decrypt a stream.
    task = crypt.DecryptStreamAsync(stream);
    success = task->Run();

    int n = eStrings.get_Count();
    for (i = 0; i <= n - 1; i++) {
        success = stream.WriteBytesENC(eStrings.getString(i),"hex");
        if (stream.get_DataAvailable() == true) {
            plainText = stream.readString();
            strOut.append(plainText);
            strOut.append("\r\n");
        }

    }

    // Tell the background task that the stream has ended.
    success = stream.WriteClose();

    // Let's make sure the background task finished.
    // It should already be the case that the task is finished.
    while ((task->get_Finished() != true)) {
        task->SleepMs(20);
    }

    // Get any remaining data available from the stream.
    if (stream.get_DataAvailable() == true) {
        plainText = stream.readString();
        strOut.append(plainText);
        strOut.append("\r\n");
    }

    if (task->get_TaskSuccess() != true) {
        strOut.append("async decryption failed:");
        strOut.append("\r\n");
        strOut.append(task->resultErrorText());
        strOut.append("\r\n");
        success = false;
    }

    delete task;

    strOut.append("-- decrypt finished --");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.