Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

VBScript Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Code Signing
Compression
DKIM / DomainKey
DNS
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
Misc
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
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(VBScript) RSA Encrypting Symmetric Secret Key

The RSA encryption algorithm is computationally expensive. It is not the best choice for encrypting large amounts of data. Symmetric encryption algorithms such as AES (i.e. Rijndael) or Blowfish are much more efficient. A typical application scenario is that you want to send encrypted messages to a partner, but you don't want to send the symmetric key unprotected. A solution is to generate a public/private RSA key pair and provide your partner with the public key (in advance). You may then encrypt the symmetric algorithm's key using the RSA private key. Next, encrypt the message using the symmetric algorithm, and send your partner both the encrypted key and encrypted message. Your partner decrypts by first RSA decrypting the key, and then uses the decrypted symmetric key to decrypt the message content.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

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

set rsa = CreateObject("Chilkat_9_5_0.Rsa")
set crypt = CreateObject("Chilkat_9_5_0.Crypt2")

' Load a public/private key pair from a .snk key file.
' Assume you have already provided your partner with 
' the public key part of the key pair.
xmlKey = rsa.SnkToXml("chilkat2.snk")

' Alternatively, you may generate a public/private key pair 
' by calling GenerateKey..

' Import the private key into the RSA instance.
success = rsa.ImportPrivateKey(xmlKey)

' Our message data will be encrypted using 128-bit AES
' encryption, using CBC (cipher-block chaining).
crypt.CryptAlgorithm = "aes"
crypt.CipherMode = "cbc"
crypt.KeyLength = 128

' Generate a 128-bit secret key from a passphrase and return it as a hex string.
secretKey = crypt.GenEncodedSecretKey("secret","hex")
outFile.WriteLine("Unencrypted Key: " & secretKey)

' Use the key we generated:
crypt.SetEncodedKey secretKey,"hex"

' RSA encrypt the secret key and return as a hex string:
rsa.EncodingMode = "hex"
bUsePrivateKey = 0
encryptedKey = rsa.EncryptStringENC(secretKey,bUsePrivateKey)

' Symmetric encrypt a message.  For this example the message
' is very short, but typically this is where a large amount
' of data may be encrypted.
crypt.EncodingMode = "base64"
encryptedText = crypt.EncryptStringENC("Hello World!")

' Show our encrypted key and encrypted text:
outFile.WriteLine("Encrypted Key: " & encryptedKey)
outFile.WriteLine("Encrypted Text: " & encryptedText)

' Assume we sent these strings to our partner...

' Here's what we do at the partner end:
success = rsa.ImportPublicKey(xmlKey)

' First, decrypt the encryptedKey:
bUsePrivateKey = 1
decryptedKey = rsa.DecryptStringENC(encryptedKey,bUsePrivateKey)
outFile.WriteLine("Decrypted Key: " & decryptedKey)

' Set our crypt object's properties and secret key:
set crypt2 = CreateObject("Chilkat_9_5_0.Crypt2")
crypt2.CryptAlgorithm = "aes"
crypt2.CipherMode = "cbc"
crypt2.KeyLength = 128
crypt2.EncodingMode = "base64"
crypt2.SetEncodedKey decryptedKey,"hex"

' Decrypt the message:
decryptedText = crypt2.DecryptStringENC(encryptedText)
outFile.WriteLine("Decrypted Text: " & decryptedText)

outFile.Close

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.