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

Xojo Plugin 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

 

 

 

(Xojo Plugin) JWE with DEFLATE Compression

Demonstrates how to DEFLATE ("zip") compress the JWE payload prior to encryption.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

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

//  Note: This example requires Chilkat v9.5.0.66 or greater.

Dim success As Boolean
//  Create some plaintext to be encrypted.
//  This example will demonstrate with and without DEFLATE (zip) compression.
Dim sbPlainText As New Chilkat.StringBuilder
Dim bCrLf As Boolean
bCrLf = True
Dim line As String
line = "Live long and prosper."
success = sbPlainText.AppendLine(line,bCrLf)
success = sbPlainText.AppendLine(line,bCrLf)
success = sbPlainText.AppendLine(line,bCrLf)
success = sbPlainText.AppendLine(line,bCrLf)

//  The text to be encrypted:
System.DebugLog(sbPlainText.GetAsString())

Dim jwe As New Chilkat.Jwe

//  Build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256","zip":"DEF"}
//  The "zip":"DEF" parameter indicates that the plaintext payload should
//  be compressed prior to encryption.
Dim jweProtHdr As New Chilkat.JsonObject
success = jweProtHdr.AppendString("alg","A128KW")
success = jweProtHdr.AppendString("enc","A128CBC-HS256")
success = jweProtHdr.AppendString("zip","DEF")
success = jwe.SetProtectedHeader(jweProtHdr)

//  Set the AES key wrap key:
Dim aesWrappingKey As String
aesWrappingKey = "GawgguFyGrWKav7AX4VKUg"
success = jwe.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Encrypt and return the JWE in sbJweCompressed:
Dim sbJweCompressed As New Chilkat.StringBuilder
success = jwe.EncryptSb(sbPlainText,"utf-8",sbJweCompressed)
If (success <> True) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

//  Show the compressed JWE:
System.DebugLog(sbJweCompressed.GetAsString())
System.DebugLog("size of compressed JWE: " + Str(sbJweCompressed.Length))

//  Now create a JWE without compression.
success = jweProtHdr.Delete("zip")
//  Make sure to update the shared protected header:
success = jwe.SetProtectedHeader(jweProtHdr)

Dim sbJweUncompressed As New Chilkat.StringBuilder
success = jwe.EncryptSb(sbPlainText,"utf-8",sbJweUncompressed)
If (success <> True) Then
    System.DebugLog(jwe.LastErrorText)
    Return
End If

//  Show the uncompressed JWE:
System.DebugLog(sbJweUncompressed.GetAsString())
System.DebugLog("size of uncompressed JWE: " + Str(sbJweUncompressed.Length))

//  Decrypting is the same whether compression is used or not.
//  The "zip" header in the JWE indicates that the payload should be
//  automatically decompressed (inflated) after decrypting.
Dim jwe2 As New Chilkat.Jwe
success = jwe2.LoadJweSb(sbJweCompressed)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

//  Set the AES wrap key.
success = jwe2.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Decrypt (also automatically decompresses).
Dim sbOriginalText As New Chilkat.StringBuilder
success = jwe2.DecryptSb(0,"utf-8",sbOriginalText)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

System.DebugLog("original text from compressed JWE: ")
System.DebugLog(sbOriginalText.GetAsString())

//  -----------------------------------------------------------
//  Do the same with the uncompressed JWE

success = jwe2.LoadJweSb(sbJweUncompressed)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

//  Set the AES wrap key.
success = jwe2.SetWrappingKey(0,aesWrappingKey,"base64url")

//  Decrypt.
sbOriginalText.Clear 
success = jwe2.DecryptSb(0,"utf-8",sbOriginalText)
If (success <> True) Then
    System.DebugLog(jwe2.LastErrorText)
    Return
End If

System.DebugLog("original text from uncompressed JWE: ")
System.DebugLog(sbOriginalText.GetAsString())

//  ------------------------------------------------
//  The output of this example is:
//  (Note: Your output data will be different because the content encryption key is randomly generated.)

//  eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiemlwIjoiREVGIn0.xuW-pEAIdEUFnk10m8ocursvktO8Of9ByCCAt6LgKkkOtCWCUn1kQw.zpGj-9WVni3cQxyOuZbcGA.0hzP1myua3oYpUHwCIY_3edBUREbUpLaX6wYuJduOdI.Ppc6aEO3y3B8BJ1FKMPjlA
//  size of compressed JWE: 212
//  eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.N4KeyC7nnSFkieJOyE24_zKeuV_m7v5UKoJb1TgV4Yc_r2RzUPNvyA.6AEdyXSCKx-iMmUJyypSLg.QpixfyrwhGpmwUDp623viik4smPav7vwPLiC2r-V-jwnSfEH3mxWu6DbrIz3mixaqATwynmEBzVPxvS9jTXpSAGCnniib4_0WoPl3r_wF5tlsKOEe--jpNso-DKd1Tp8jJxj3JkFWt3IRnUUKGj17g.sBfDwFc5fzpaI-UW8-SW4g
//  size of uncompressed JWE: 303
//  original text from compressed JWE:
//  Live long and prosper.
//  Live long and prosper.
//  Live long and prosper.
//  Live long and prosper.
// 
//  original text from uncompressed JWE:
//  Live long and prosper.
//  Live long and prosper.
//  Live long and prosper.
//  Live long and prosper.
// 

 

© 2000-2021 Chilkat Software, Inc. All Rights Reserved.