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

VB.NET UWP/WinRT Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
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

 

 

 

(VB.NET UWP/WinRT) Decrypt a SAML Response

Demonstrates how to decrypt a SAML response.

Note: This example requires Chilkat v9.5.0.76 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

'  This example decrypts this SAML response:

'  <?xml version="1.0" encoding="UTF-8" ?>
'  <saml2p:Response Destination="https://deskflow-asp2.com/ubc/ubcdfe.dll/cwlacs" ID="_e4585eaeedbcaf7c24dff7f1ee2499f5" IssueInstant="2018-10-11T17:46:20.727Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol">
'      <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">https://authentication.stg.id.ubc.ca</saml2:Issuer>
'      <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
'          <ds:SignedInfo>
'              <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
'              <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
'              <ds:Reference URI="#_e4585eaeedbcaf7c24dff7f1ee2499f5">
'                  <ds:Transforms>
'                      <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
'                      <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
'                  </ds:Transforms>
'                  <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
'                  <ds:DigestValue>1ui22tqFyYEOoWI19CMwz4n+ynxNjLDGdTeRMdi60EU=</ds:DigestValue>
'              </ds:Reference>
'          </ds:SignedInfo>
'          <ds:SignatureValue>ROg7FXV6vsp8socVhdo76/i7cRHGGKIveAiScKdujZT0QrHVqIvvbZ/RnwvEMJ9H9i/kJFAQA171
'  		Eo2kDjSdvNFQ/YcKaJUwMtAwT05yVatGV42RZKEf7ME+vpcCTR1LWZdrhat1FWCg1MNQwNWB0EL5
'  		fEP2a4jAcSTB8tFbjTAHsv7IWC39E5RVv99mACYXLa7iGZLtORANZxgYu5qQgmH6pUkI6Z1cpmf+
'  		m9mIjKM6LF0EvLfWOBWL6udZ+GsHPOLjVTJg+1S0xb9FQCYDVW1QhbjSS0icKHKTNNbrsaxllVDY
'  		m4q27YQjRh+XxugPgvsZ61Pxlto8Jbg+6jUlMQ==</ds:SignatureValue>
'          <ds:KeyInfo>
'              <ds:X509Data>
'                  <ds:X509Certificate>MIIDTTCCAjWgAwIBAgIVAJccYyIV6wly8XyddumpgnHMJ2JLMA0GCSqGSIb3DQEBCwUAMCcxJTAj
'  			BgNVBAMMHGF1dGhlbnRpY2F0aW9uLnN0Zy5pZC51YmMuY2EwHhcNMTcwMzAxMTk1NDM0WhcNMzcw
'  			...
'  			xUuh6HuHKIwQqHBz7udxbH3Zbb6jXGDJjiDHt1LRJ8xbVisFIcDlIwsGQQi0HeEJfx4P</ds:X509Certificate>
'              </ds:X509Data>
'          </ds:KeyInfo>
'      </ds:Signature>
'      <saml2p:Status>
'          <saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
'      </saml2p:Status>
'      <saml2:EncryptedAssertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
'          <xenc:EncryptedData Id="_314d80b9cf02d8eda8d686a6ffd626cf" Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
'              <xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"/>
'              <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
'                  <xenc:EncryptedKey Id="_d7b6da6fb59a627ebb4a96928441ab79" Recipient="https://ubcdfe.deskflow-asp2.com" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
'                      <xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
'                          <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
'                      </xenc:EncryptionMethod>
'                      <ds:KeyInfo>
'                          <ds:X509Data>
'                              <ds:X509Certificate>MIICuzCCAiQCCQD3bpigRnKMSzANBgkqhkiG9w0BAQsFADCBoTELMAkGA1UEBhMCQ0ExEDAOBgNV
'  				BAgMB09udGFyaW8xEDAOBgNVBAcMB1Rvcm9udG8xJjAkBgNVBAoMHVRhY3RpY2FsIEJ1c2luZXNz
'  				...
'  				kVRcHd1UK3q7G8FoykWjdQz/0EoMTfEZ+Md56mLOe48eMUZV2ONZuL1kDCEKw1UwkaDQI4Pf8pzx
'  				82b9rgw9wBDtvu5eFPlUGEGIBw==</ds:X509Certificate>
'                          </ds:X509Data>
'                      </ds:KeyInfo>
'                      <xenc:CipherData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
'                          <xenc:CipherValue>BNHfUOpgdPE5BgpN2VIZIDthMAv1rxk91qVnWyCZOG9bmUKChJtTUqMpndot7VJwYuyKFshkAdnT
'  				D79KGdlSA1xHKcVeZXXzDWglqSyYjzhDCsyOhPaI4HelMFgCLwyFz89uEpUpqlvfl8ol3Am/XnzQ
'  				Vp7V7oS76hocjUI51Qs=</xenc:CipherValue>
'                      </xenc:CipherData>
'                  </xenc:EncryptedKey>
'              </ds:KeyInfo>
'              <xenc:CipherData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
'                  <xenc:CipherValue>R6l7tmbnXrOfBgB8lA3KnwLYsLH5ZO5omQ7Hp5K05atzw2o55xmCXVMYhNneFxMtxUh6raEyHeZX
'  			PTZNgWrvdqc4GYND/R7MhRrJzk9OAq1WyoOXwbtRpwNDwWA4N2IuprPQJbvjVxaw/PesZMZwZqlp
'  			...
'  			zm9zAxahyu8Ooe8M4r3HN2cY0JxxxkZtDiulbnyA+rRtXfBRJtangvFQ4iFAnzM/Yg9hMyW9jcu0
'  			S7FzuRB9ONMxi+nh0IFWgqp+</xenc:CipherValue>
'              </xenc:CipherData>
'          </xenc:EncryptedData>
'      </saml2:EncryptedAssertion>
'  </saml2p:Response>

'  The sample encrypted SAML response and RSA private key are available online:
Dim http As New Chilkat.Http
Dim sbSamlResponse As New Chilkat.StringBuilder
Dim sbPrivateKeyPem As New Chilkat.StringBuilder
Dim success As Boolean = Await http.QuickGetSbAsync("https://chilkatdownload.com/data/samlresponse.xml",sbSamlResponse)
If (success = True) Then
    success = Await http.QuickGetSbAsync("https://chilkatdownload.com/data/samlresponse_privkey.pem",sbPrivateKeyPem)
End If

If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim xml As New Chilkat.Xml
xml.LoadSb(sbSamlResponse,True)

'  Load the RSA private key..
Dim privkey As New Chilkat.PrivateKey
success = privkey.LoadPem(sbPrivateKeyPem.GetAsString())
If (success <> True) Then
    Debug.WriteLine(privkey.LastErrorText)
    Exit Sub
End If


'  Prepare an RSA object w/ the private key...
Dim rsa As New Chilkat.Rsa
success = rsa.ImportPrivateKeyObj(privkey)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


'  RSA will be used to decrypt the xenc:EncryptedKey
'  The bytes to be decrypted are in xenc:CipherValue (in base64 format)
Dim encryptedAesKey As String = xml.GetChildContent("saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:CipherData|xenc:CipherValue")
If (xml.LastMethodSuccess <> True) Then
    Debug.WriteLine("Encrypted AES key not found.")
    Exit Sub
End If

Debug.WriteLine("Encrypted AES key (base64) = " & encryptedAesKey)

Dim bdAesKey As New Chilkat.BinData
bdAesKey.AppendEncoded(encryptedAesKey,"base64")

Dim sbRsaAlg As New Chilkat.StringBuilder
sbRsaAlg.Append(xml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:EncryptionMethod|(Algorithm)"))
Debug.WriteLine("sbRsaAlg contains: " & sbRsaAlg.GetAsString())
If (sbRsaAlg.Contains("rsa-oaep",True) = True) Then
    rsa.OaepPadding = True
End If


'  Note: The DecryptBd method is introduced in Chilkat v9.5.0.76
success = rsa.DecryptBd(bdAesKey,True)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Decrypted AES key (hex) = " & bdAesKey.GetEncoded("hex"))

'  Get the encrypted XML (in base64) to be decrypted w/ the AES key.
Dim encrypted64 As String = xml.GetChildContent("saml2:EncryptedAssertion|xenc:EncryptedData|xenc:CipherData|xenc:CipherValue")
If (xml.LastMethodSuccess <> True) Then
    Debug.WriteLine("Encrypted data not found.")
    Exit Sub
End If

Dim bdEncrypted As New Chilkat.BinData
bdEncrypted.AppendEncoded(encrypted64,"base64")

'  Get the symmetric algorithm:  "http://www.w3.org/2001/04/xmlenc#aes128-cbc"
'  and set the symmetric decrypt properties.
Dim crypt As New Chilkat.Crypt2
Dim sbAlg As New Chilkat.StringBuilder
sbAlg.Append(xml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|xenc:EncryptionMethod|(Algorithm)"))
If (sbAlg.Contains("aes128-cbc",True) = True) Then
    crypt.CryptAlgorithm = "aes"
    crypt.KeyLength = 128
    crypt.CipherMode = "cbc"
    '  The 1st 16 bytes of the encrypted data are the AES IV.
    crypt.SetEncodedIV(bdEncrypted.GetEncodedChunk(0,16,"hex"),"hex")
    bdEncrypted.RemoveChunk(0,16)
End If

'  Other algorithms, key lengths, etc, can be supported by checking for different Algorithm attribute values..

crypt.SetEncodedKey(bdAesKey.GetEncoded("hex"),"hex")

'  AES decrypt...
success = crypt.DecryptBd(bdEncrypted)
If (success <> True) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


'  Get the decrypted XML
Dim decryptedXml As String = bdEncrypted.GetString("utf-8")
Debug.WriteLine("Decrypted XML:")
Debug.WriteLine(decryptedXml)

'  The decrypted XML looks like this:

'  <saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" ID="_226e565c548db7986d165d7d969b48b4" IssueInstant="2018-10-11T17:46:20.727Z" Version="2.0">
'  ...
'  ...
'  ...
'  </saml2:Assertion>

Dim xmlAssertion As New Chilkat.Xml
xmlAssertion.LoadXml(decryptedXml)

'  Replace the saml2:EncryptedAssertion XML subtree with the saml2:Assertion XML.
Dim xmlEncryptedAssertion As Chilkat.Xml = xml.FindChild("saml2:EncryptedAssertion")
xmlEncryptedAssertion.SwapTree(xmlAssertion)


'  The decrypted XML assertion has now replaced the encrypted XML assertion.
'  Examine the fully decrypted XML document:
Debug.WriteLine("Full XML SAML document with decrypted assertion:")
Debug.WriteLine(xml.GetXml())

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.