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

Visual FoxPro 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

 

 

 

(Visual FoxPro) Verify an XML Signature with Multiple References

Demonstrates how to verify an XML digital signature that contains multiple references.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL loSbXml
LOCAL lnSuccess
LOCAL loVerifier
LOCAL lnVerifyReferenceDigests
LOCAL lnVerified
LOCAL lnSignedInfoVerified
LOCAL lnNumRefs
LOCAL i
LOCAL lnRefDigestVerified

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

* An example of an enveloping XML signature with mulitple references is available at
* https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml

* This example will show how to verify the signature and all references, and also how
* to verify each reference individually.  This is useful to distinguish which part
* of the XML signature validation failed.  It could be that one or more of the references
* failed because of a hash computation mismatch.  Or it could be that the signature over
* the SignedInfo failed.  

* First, let's grab the sample XML signature.
loHttp = CreateObject('Chilkat_9_5_0.Http')
loSbXml = CreateObject('Chilkat_9_5_0.StringBuilder')
lnSuccess = loHttp.QuickGetSb("https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml",loSbXml)
IF (lnSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loSbXml
    CANCEL
ENDIF

* Load the XML containing the signature to be verified.
loVerifier = CreateObject('Chilkat_9_5_0.XmlDSig')
lnSuccess = loVerifier.LoadSignatureSb(loSbXml)
IF (lnSuccess <> 1) THEN
    ? loVerifier.LastErrorText
    RELEASE loHttp
    RELEASE loSbXml
    RELEASE loVerifier
    CANCEL
ENDIF

lnVerifyReferenceDigests = 1

* The quick way to validate all references and the signature over the SignedInfo
* is to call VerifySignature with verifyReferenceDigests equal to 1.
lnVerified = loVerifier.VerifySignature(lnVerifyReferenceDigests)
? "Signature and all reference digests verified = " + STR(lnVerified)

* Let's pretend the call to VerifySignature returned 0.  Something did not validate.
* Was it one or more of the References that did not hash to the correct value?
* Or was it the signature over the SignedInfo that failed?
* We can check just the signature over the SignedInfo by passing 0 to VerifySignature.
* This allows us to skip the hashing and checking each Reference.  
lnVerifyReferenceDigests = 0
lnSignedInfoVerified = loVerifier.VerifySignature(lnVerifyReferenceDigests)
? "Neglecting the reference hashes, the SignedInfo validation result = " + STR(lnSignedInfoVerified)

* We can also verify each reference digest separately
lnNumRefs = loVerifier.NumReferences
i = 0
DO WHILE i < lnNumRefs
    lnRefDigestVerified = loVerifier.VerifyReferenceDigest(i)
    ? "Reference " + STR(i) + " digest verified = " + STR(lnRefDigestVerified)
    i = i + 1
ENDDO

* For this sample XML signature with 3 References, we get the following output:

* Signature and all reference digests verified = True
* Neglecting the reference hashes, the SignedInfo validation result = True
* Reference 0 digest verified = True
* Reference 1 digest verified = True
* Reference 2 digest verified = Tru

RELEASE loHttp
RELEASE loSbXml
RELEASE loVerifier


 

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