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

DataFlex 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

 

 

 

(DataFlex) Validate JWS Using HMAC SHA-256

Validates a JSON Web Signature (JWS) using HMAC SHA-256.

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJws
    String sHmacKey
    Integer iSignatureIndex
    String sJwsCompact
    Boolean iSuccess
    Integer v
    Variant vJoseHeader
    Handle hoJoseHeader
    String sTemp1
    Boolean bTemp1

    //  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.

    //  This example takes a JSON signature in compact serialization format,
    //  and uses a MAC key to validate and recover the protected header and payload.

    Get Create (RefClass(cComChilkatJws)) To hoJws
    If (Not(IsComObjectCreated(hoJws))) Begin
        Send CreateComObject of hoJws
    End

    //  Set the HMAC key:
    Move "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow" To sHmacKey
    Move 0 To iSignatureIndex
    Get ComSetMacKey Of hoJws iSignatureIndex sHmacKey "base64url" To iSuccess

    //  Load the JWS.
    Move "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk" To sJwsCompact
    Get ComLoadJws Of hoJws sJwsCompact To iSuccess

    //  Validate the 1st (and only) signature at index 0..
    Get ComValidate Of hoJws iSignatureIndex To v
    If (v < 0) Begin
        //  Perhaps Chilkat was not unlocked or the trial expired..
        Showln "Method call failed for some other reason."
        Get ComLastErrorText Of hoJws To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    If (v = 0) Begin
        Showln "Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both."
        Procedure_Return
    End

    //  If we get here, the signature was validated..
    Showln "Signature validated."

    //  Recover the original content:
    Showln "Recovered content:"
    Get ComGetPayload Of hoJws "utf-8" To sTemp1
    Showln sTemp1

    //  Examine the protected header:
    Get ComGetProtectedHeader Of hoJws iSignatureIndex To vJoseHeader
    If (IsComObject(vJoseHeader)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoJoseHeader
        Set pvComObject Of hoJoseHeader To vJoseHeader
    End
    Get ComLastMethodSuccess Of hoJws To bTemp1
    If (bTemp1 <> True) Begin
        Showln "No protected header found at the given index."
        Procedure_Return
    End

    Set ComEmitCompact Of hoJoseHeader To False

    Showln "Protected (JOSE) header:"
    Get ComEmit Of hoJoseHeader To sTemp1
    Showln sTemp1
    Send Destroy of hoJoseHeader

    //  Output:

    //  	Signature validated.
    //  	Recovered content:
    //  	{"iss":"joe",
    //  	 "exp":1300819380,
    //  	 "http://example.com/is_root":true}
    //  	Protected (JOSE) header:
    //  	{
    //  	  "typ": "JWT",
    //  	  "alg": "HS256"
    //  	}


End_Procedure

 

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