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

Mono C# 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

 

 

 

(Mono C#) Verify an XML Signature with Multiple References

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

Chilkat .NET Downloads

Chilkat .NET Assemblies

Chilkat for .NET Core

Chilkat for Mono

//  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.
Chilkat.Http http = new Chilkat.Http();
Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder();
bool success = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/envelopedMultipleRefs.xml",sbXml);
if (success != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

//  Load the XML containing the signature to be verified.
Chilkat.XmlDSig verifier = new Chilkat.XmlDSig();
success = verifier.LoadSignatureSb(sbXml);
if (success != true) {
    Debug.WriteLine(verifier.LastErrorText);
    return;
}

bool verifyReferenceDigests = true;

//  The quick way to validate all references and the signature over the SignedInfo
//  is to call VerifySignature with verifyReferenceDigests equal to true.
bool verified = verifier.VerifySignature(verifyReferenceDigests);
Debug.WriteLine("Signature and all reference digests verified = " + Convert.ToString(verified));

//  Let's pretend the call to VerifySignature returned false.  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 false to VerifySignature.
//  This allows us to skip the hashing and checking each Reference.
verifyReferenceDigests = false;
bool signedInfoVerified = verifier.VerifySignature(verifyReferenceDigests);
Debug.WriteLine("Neglecting the reference hashes, the SignedInfo validation result = " + Convert.ToString(signedInfoVerified));

//  We can also verify each reference digest separately
int numRefs = verifier.NumReferences;
int i = 0;
while (i < numRefs) {
    bool refDigestVerified = verifier.VerifyReferenceDigest(i);
    Debug.WriteLine("Reference " + Convert.ToString(i) + " digest verified = " + Convert.ToString(refDigestVerified));
    i = i + 1;
}

//  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 = True

 

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