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(Visual FoxPro) Decrypt a SAML Response

Demonstrates how to decrypt a SAML response.

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL loSbSamlResponse
LOCAL loSbPrivateKeyPem
LOCAL lnSuccess
LOCAL loXml
LOCAL loPrivkey
LOCAL loRsa
LOCAL lcEncryptedAesKey
LOCAL loBdAesKey
LOCAL loSbRsaAlg
LOCAL lcEncrypted64
LOCAL loBdEncrypted
LOCAL loCrypt
LOCAL loSbAlg
LOCAL lcDecryptedXml
LOCAL loXmlAssertion
LOCAL loXmlEncryptedAssertion

* 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:
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbSamlResponse = CreateObject('Chilkat.StringBuilder')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbPrivateKeyPem = CreateObject('Chilkat.StringBuilder')
lnSuccess = loHttp.QuickGetSb("https://chilkatdownload.com/data/samlresponse.xml",loSbSamlResponse)
IF (lnSuccess = 1) THEN
    lnSuccess = loHttp.QuickGetSb("https://chilkatdownload.com/data/samlresponse_privkey.pem",loSbPrivateKeyPem)
ENDIF

IF (lnSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Xml')
loXml = CreateObject('Chilkat.Xml')
loXml.LoadSb(loSbSamlResponse,1)

* Load the RSA private key..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PrivateKey')
loPrivkey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivkey.LoadPem(loSbPrivateKeyPem.GetAsString())
IF (lnSuccess <> 1) THEN
    ? loPrivkey.LastErrorText
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    CANCEL
ENDIF

* Prepare an RSA object w/ the private key...
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rsa')
loRsa = CreateObject('Chilkat.Rsa')
lnSuccess = loRsa.ImportPrivateKeyObj(loPrivkey)
IF (lnSuccess <> 1) THEN
    ? loRsa.LastErrorText
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    RELEASE loRsa
    CANCEL
ENDIF

* RSA will be used to decrypt the xenc:EncryptedKey
* The bytes to be decrypted are in xenc:CipherValue (in base64 format)
lcEncryptedAesKey = loXml.GetChildContent("saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:CipherData|xenc:CipherValue")
IF (loXml.LastMethodSuccess <> 1) THEN
    ? "Encrypted AES key not found."
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    RELEASE loRsa
    CANCEL
ENDIF

? "Encrypted AES key (base64) = " + lcEncryptedAesKey

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdAesKey = CreateObject('Chilkat.BinData')
loBdAesKey.AppendEncoded(lcEncryptedAesKey,"base64")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbRsaAlg = CreateObject('Chilkat.StringBuilder')
loSbRsaAlg.Append(loXml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:EncryptionMethod|(Algorithm)"))
? "sbRsaAlg contains: " + loSbRsaAlg.GetAsString()
IF (loSbRsaAlg.Contains("rsa-oaep",1) = 1) THEN
    loRsa.OaepPadding = 1
ENDIF

* Note: The DecryptBd method is introduced in Chilkat v9.5.0.76
lnSuccess = loRsa.DecryptBd(loBdAesKey,1)
IF (lnSuccess <> 1) THEN
    ? loRsa.LastErrorText
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    RELEASE loRsa
    RELEASE loBdAesKey
    RELEASE loSbRsaAlg
    CANCEL
ENDIF

? "Decrypted AES key (hex) = " + loBdAesKey.GetEncoded("hex")

* Get the encrypted XML (in base64) to be decrypted w/ the AES key.
lcEncrypted64 = loXml.GetChildContent("saml2:EncryptedAssertion|xenc:EncryptedData|xenc:CipherData|xenc:CipherValue")
IF (loXml.LastMethodSuccess <> 1) THEN
    ? "Encrypted data not found."
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    RELEASE loRsa
    RELEASE loBdAesKey
    RELEASE loSbRsaAlg
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdEncrypted = CreateObject('Chilkat.BinData')
loBdEncrypted.AppendEncoded(lcEncrypted64,"base64")

* Get the symmetric algorithm:  "http://www.w3.org/2001/04/xmlenc#aes128-cbc"
* and set the symmetric decrypt properties.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbAlg = CreateObject('Chilkat.StringBuilder')
loSbAlg.Append(loXml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|xenc:EncryptionMethod|(Algorithm)"))
IF (loSbAlg.Contains("aes128-cbc",1) = 1) THEN
    loCrypt.CryptAlgorithm = "aes"
    loCrypt.KeyLength = 128
    loCrypt.CipherMode = "cbc"
    * The 1st 16 bytes of the encrypted data are the AES IV.
    loCrypt.SetEncodedIV(loBdEncrypted.GetEncodedChunk(0,16,"hex"),"hex")
    loBdEncrypted.RemoveChunk(0,16)
ENDIF

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

loCrypt.SetEncodedKey(loBdAesKey.GetEncoded("hex"),"hex")

* AES decrypt...
lnSuccess = loCrypt.DecryptBd(loBdEncrypted)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loHttp
    RELEASE loSbSamlResponse
    RELEASE loSbPrivateKeyPem
    RELEASE loXml
    RELEASE loPrivkey
    RELEASE loRsa
    RELEASE loBdAesKey
    RELEASE loSbRsaAlg
    RELEASE loBdEncrypted
    RELEASE loCrypt
    RELEASE loSbAlg
    CANCEL
ENDIF

* Get the decrypted XML
lcDecryptedXml = loBdEncrypted.GetString("utf-8")
? "Decrypted XML:"
? lcDecryptedXml

* 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>

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Xml')
loXmlAssertion = CreateObject('Chilkat.Xml')
loXmlAssertion.LoadXml(lcDecryptedXml)

* Replace the saml2:EncryptedAssertion XML subtree with the saml2:Assertion XML.
loXmlEncryptedAssertion = loXml.FindChild("saml2:EncryptedAssertion")
loXmlEncryptedAssertion.SwapTree(loXmlAssertion)
RELEASE loXmlEncryptedAssertion

* The decrypted XML assertion has now replaced the encrypted XML assertion.
* Examine the fully decrypted XML document:
? "Full XML SAML document with decrypted assertion:"
? loXml.GetXml()

RELEASE loHttp
RELEASE loSbSamlResponse
RELEASE loSbPrivateKeyPem
RELEASE loXml
RELEASE loPrivkey
RELEASE loRsa
RELEASE loBdAesKey
RELEASE loSbRsaAlg
RELEASE loBdEncrypted
RELEASE loCrypt
RELEASE loSbAlg
RELEASE loXmlAssertion
 

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