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

PureBasic 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

 

 

 

(PureBasic) Decrypt a SAML Response

Demonstrates how to decrypt a SAML response.

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

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkBinData.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkXml.pb"
IncludeFile "CkCrypt2.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkRsa.pb"

Procedure ChilkatExample()

    ;  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:
    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    sbSamlResponse.i = CkStringBuilder::ckCreate()
    If sbSamlResponse.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    sbPrivateKeyPem.i = CkStringBuilder::ckCreate()
    If sbPrivateKeyPem.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkHttp::ckQuickGetSb(http,"https://chilkatdownload.com/data/samlresponse.xml",sbSamlResponse)
    If success = 1
        success = CkHttp::ckQuickGetSb(http,"https://chilkatdownload.com/data/samlresponse_privkey.pem",sbPrivateKeyPem)
    EndIf

    If success <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        ProcedureReturn
    EndIf

    xml.i = CkXml::ckCreate()
    If xml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::ckLoadSb(xml,sbSamlResponse,1)

    ;  Load the RSA private key..
    privkey.i = CkPrivateKey::ckCreate()
    If privkey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadPem(privkey,CkStringBuilder::ckGetAsString(sbPrivateKeyPem))
    If success <> 1
        Debug CkPrivateKey::ckLastErrorText(privkey)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        ProcedureReturn
    EndIf

    ;  Prepare an RSA object w/ the private key...
    rsa.i = CkRsa::ckCreate()
    If rsa.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRsa::ckImportPrivateKeyObj(rsa,privkey)
    If success <> 1
        Debug CkRsa::ckLastErrorText(rsa)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        CkRsa::ckDispose(rsa)
        ProcedureReturn
    EndIf

    ;  RSA will be used to decrypt the xenc:EncryptedKey
    ;  The bytes to be decrypted are in xenc:CipherValue (in base64 format)
    encryptedAesKey.s = CkXml::ckGetChildContent(xml,"saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:CipherData|xenc:CipherValue")
    If CkXml::ckLastMethodSuccess(xml) <> 1
        Debug "Encrypted AES key not found."
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        CkRsa::ckDispose(rsa)
        ProcedureReturn
    EndIf

    Debug "Encrypted AES key (base64) = " + encryptedAesKey

    bdAesKey.i = CkBinData::ckCreate()
    If bdAesKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkBinData::ckAppendEncoded(bdAesKey,encryptedAesKey,"base64")

    sbRsaAlg.i = CkStringBuilder::ckCreate()
    If sbRsaAlg.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbRsaAlg,CkXml::ckChilkatPath(xml,"saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:EncryptionMethod|(Algorithm)"))
    Debug "sbRsaAlg contains: " + CkStringBuilder::ckGetAsString(sbRsaAlg)
    If CkStringBuilder::ckContains(sbRsaAlg,"rsa-oaep",1) = 1
        CkRsa::setCkOaepPadding(rsa, 1)
    EndIf

    ;  Note: The DecryptBd method is introduced in Chilkat v9.5.0.76
    success = CkRsa::ckDecryptBd(rsa,bdAesKey,1)
    If success <> 1
        Debug CkRsa::ckLastErrorText(rsa)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        CkRsa::ckDispose(rsa)
        CkBinData::ckDispose(bdAesKey)
        CkStringBuilder::ckDispose(sbRsaAlg)
        ProcedureReturn
    EndIf

    Debug "Decrypted AES key (hex) = " + CkBinData::ckGetEncoded(bdAesKey,"hex")

    ;  Get the encrypted XML (in base64) to be decrypted w/ the AES key.
    encrypted64.s = CkXml::ckGetChildContent(xml,"saml2:EncryptedAssertion|xenc:EncryptedData|xenc:CipherData|xenc:CipherValue")
    If CkXml::ckLastMethodSuccess(xml) <> 1
        Debug "Encrypted data not found."
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        CkRsa::ckDispose(rsa)
        CkBinData::ckDispose(bdAesKey)
        CkStringBuilder::ckDispose(sbRsaAlg)
        ProcedureReturn
    EndIf

    bdEncrypted.i = CkBinData::ckCreate()
    If bdEncrypted.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkBinData::ckAppendEncoded(bdEncrypted,encrypted64,"base64")

    ;  Get the symmetric algorithm:  "http://www.w3.org/2001/04/xmlenc#aes128-cbc"
    ;  and set the symmetric decrypt properties.
    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    sbAlg.i = CkStringBuilder::ckCreate()
    If sbAlg.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbAlg,CkXml::ckChilkatPath(xml,"saml2:EncryptedAssertion|xenc:EncryptedData|xenc:EncryptionMethod|(Algorithm)"))
    If CkStringBuilder::ckContains(sbAlg,"aes128-cbc",1) = 1
        CkCrypt2::setCkCryptAlgorithm(crypt, "aes")
        CkCrypt2::setCkKeyLength(crypt, 128)
        CkCrypt2::setCkCipherMode(crypt, "cbc")
        ;  The 1st 16 bytes of the encrypted data are the AES IV.
        CkCrypt2::ckSetEncodedIV(crypt,CkBinData::ckGetEncodedChunk(bdEncrypted,0,16,"hex"),"hex")
        CkBinData::ckRemoveChunk(bdEncrypted,0,16)
    EndIf

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

    CkCrypt2::ckSetEncodedKey(crypt,CkBinData::ckGetEncoded(bdAesKey,"hex"),"hex")

    ;  AES decrypt...
    success = CkCrypt2::ckDecryptBd(crypt,bdEncrypted)
    If success <> 1
        Debug CkCrypt2::ckLastErrorText(crypt)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbSamlResponse)
        CkStringBuilder::ckDispose(sbPrivateKeyPem)
        CkXml::ckDispose(xml)
        CkPrivateKey::ckDispose(privkey)
        CkRsa::ckDispose(rsa)
        CkBinData::ckDispose(bdAesKey)
        CkStringBuilder::ckDispose(sbRsaAlg)
        CkBinData::ckDispose(bdEncrypted)
        CkCrypt2::ckDispose(crypt)
        CkStringBuilder::ckDispose(sbAlg)
        ProcedureReturn
    EndIf

    ;  Get the decrypted XML
    decryptedXml.s = CkBinData::ckGetString(bdEncrypted,"utf-8")
    Debug "Decrypted XML:"
    Debug 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>

    xmlAssertion.i = CkXml::ckCreate()
    If xmlAssertion.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::ckLoadXml(xmlAssertion,decryptedXml)

    ;  Replace the saml2:EncryptedAssertion XML subtree with the saml2:Assertion XML.
    xmlEncryptedAssertion.i = CkXml::ckFindChild(xml,"saml2:EncryptedAssertion")
    CkXml::ckSwapTree(xmlEncryptedAssertion,xmlAssertion)
    CkXml::ckDispose(xmlEncryptedAssertion)

    ;  The decrypted XML assertion has now replaced the encrypted XML assertion.
    ;  Examine the fully decrypted XML document:
    Debug "Full XML SAML document with decrypted assertion:"
    Debug CkXml::ckGetXml(xml)


    CkHttp::ckDispose(http)
    CkStringBuilder::ckDispose(sbSamlResponse)
    CkStringBuilder::ckDispose(sbPrivateKeyPem)
    CkXml::ckDispose(xml)
    CkPrivateKey::ckDispose(privkey)
    CkRsa::ckDispose(rsa)
    CkBinData::ckDispose(bdAesKey)
    CkStringBuilder::ckDispose(sbRsaAlg)
    CkBinData::ckDispose(bdEncrypted)
    CkCrypt2::ckDispose(crypt)
    CkStringBuilder::ckDispose(sbAlg)
    CkXml::ckDispose(xmlAssertion)


    ProcedureReturn
EndProcedure

 

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