Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

MFC Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
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
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(MFC) Adding Entropy to a PRNG

Demonstrates how system entropy is automatically added when the application does not explicitly add entropy prior to generating the 1st random data. Also demonstrates how additional entropy can be added at anytime during the lifetime of the PRNG object.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    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 = 0;

    //  The simplest way to use the Chilkat PRNG is to instantiate the object
    //  and generate random data.  This skips the explicit step of getting system entropy
    //  and adding it (via get AddEntropy method).  When no entropy is explicitly added,
    //  Chilkat will automatically add 32-bytes of system entropy on the first request
    //  for random data.

    //  Generate some random data.
    //  The 1st call to GenRandom implicitly adds 32 bytes of system entropy to seed the PRNG.
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");

    //  Note: An application can get additional system entropy and add it at any point
    //  during the lifetime of the PRNG.  For example:
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    success = fortuna->AddEntropy(fortuna->getEntropy(16,"hex"),"hex");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    success = fortuna->AddEntropy(fortuna->getEntropy(16,"hex"),"hex");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    success = fortuna->AddEntropy(fortuna->getEntropy(16,"hex"),"hex");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");
    strOut.append(fortuna->genRandom(16,"hex"));
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.