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 Encryption
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) Generating Repeatable Random Data for Testing/Debugging

Demonstrates how to use the Fortuna PRNG to generate random-looking but repeatable non-random data for the purpose of testing and debugging.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

// Needs #include <CkGlobal.h>
// Needs #include <CkPrng.h>

    CkString strOut;

    //  All Chilkat classes can be unlocked at once at the beginning of a program
    //  by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob;
    bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        strOut.append(chilkatGlob.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPrng fortuna;

    //  Normally an application would seed the PRNG with entropy from
    //  some real random source.  However, sometimes we want the same
    //  random sequence of bytes for testing and debugging purposes.
    //  This a reason why GetEntropy and AddEntropy are two different methods.
    //  An application could omit the call to GetEntropy, and instead pass
    //  non-random data to AddEntropy. For example:

    //  Seed the PRNG with non-entropy, so we get a repeatable sequence.
    //  Note: AddEntropy can be called any number of times.
    success = fortuna.AddEntropy("01020304","hex");
    success = fortuna.AddEntropy("hello world","ascii");

    //  Generate some random data:
    const char *strRandHex = fortuna.genRandom(16,"hex");
    const char *strRandBase64 = fortuna.genRandom(22,"base64");
    const char *strRandBase58 = fortuna.genRandom(32,"base58");

    strOut.append("hex random bytes: ");
    strOut.append(strRandHex);
    strOut.append("\r\n");
    strOut.append("base64 random bytes: ");
    strOut.append(strRandBase64);
    strOut.append("\r\n");
    strOut.append("base58 random bytes: ");
    strOut.append(strRandBase58);
    strOut.append("\r\n");

    //  Try it again with a different object to verify that the same results are obtained:
    CkPrng fortuna2;

    success = fortuna2.AddEntropy("01020304","hex");
    success = fortuna2.AddEntropy("hello world","ascii");

    strRandHex = fortuna2.genRandom(16,"hex");
    strRandBase64 = fortuna2.genRandom(22,"base64");
    strRandBase58 = fortuna2.genRandom(32,"base58");

    strOut.append("hex random bytes: ");
    strOut.append(strRandHex);
    strOut.append("\r\n");
    strOut.append("base64 random bytes: ");
    strOut.append(strRandBase64);
    strOut.append("\r\n");
    strOut.append("base58 random bytes: ");
    strOut.append(strRandBase58);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

 

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