Lianja
Lianja
Decrypt a SAML Response
See more Encryption Examples
Demonstrates how to decrypt a SAML response.Chilkat Lianja Downloads
llSuccess = .F.
// 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:
loHttp = createobject("CkHttp")
loSbSamlResponse = createobject("CkStringBuilder")
loSbPrivateKeyPem = createobject("CkStringBuilder")
llSuccess = loHttp.QuickGetSb("https://chilkatdownload.com/data/samlresponse.xml",loSbSamlResponse)
if (llSuccess = .T.) then
llSuccess = loHttp.QuickGetSb("https://chilkatdownload.com/data/samlresponse_privkey.pem",loSbPrivateKeyPem)
endif
if (llSuccess = .F.) then
? loHttp.LastErrorText
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
return
endif
loXml = createobject("CkXml")
loXml.LoadSb(loSbSamlResponse,.T.)
// Load the RSA private key..
loPrivkey = createobject("CkPrivateKey")
llSuccess = loPrivkey.LoadPem(loSbPrivateKeyPem.GetAsString())
if (llSuccess = .F.) then
? loPrivkey.LastErrorText
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
release loXml
release loPrivkey
return
endif
// Prepare an RSA object w/ the private key...
loRsa = createobject("CkRsa")
llSuccess = loRsa.UsePrivateKey(loPrivkey)
if (llSuccess = .F.) then
? loRsa.LastErrorText
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
release loXml
release loPrivkey
release loRsa
return
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 <> .T.) then
? "Encrypted AES key not found."
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
release loXml
release loPrivkey
release loRsa
return
endif
? "Encrypted AES key (base64) = " + lcEncryptedAesKey
loBdAesKey = createobject("CkBinData")
loBdAesKey.AppendEncoded(lcEncryptedAesKey,"base64")
loSbRsaAlg = createobject("CkStringBuilder")
loSbRsaAlg.Append(loXml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:EncryptionMethod|(Algorithm)"))
? "sbRsaAlg contains: " + loSbRsaAlg.GetAsString()
if (loSbRsaAlg.Contains("rsa-oaep",.T.) = .T.) then
loRsa.PkcsPadding = .F.
endif
llSuccess = loRsa.DecryptBd(loBdAesKey,.T.)
if (llSuccess = .F.) then
? loRsa.LastErrorText
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
release loXml
release loPrivkey
release loRsa
release loBdAesKey
release loSbRsaAlg
return
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 <> .T.) then
? "Encrypted data not found."
release loHttp
release loSbSamlResponse
release loSbPrivateKeyPem
release loXml
release loPrivkey
release loRsa
release loBdAesKey
release loSbRsaAlg
return
endif
loBdEncrypted = createobject("CkBinData")
loBdEncrypted.AppendEncoded(lcEncrypted64,"base64")
// Get the symmetric algorithm: "http://www.w3.org/2001/04/xmlenc#aes128-cbc"
// and set the symmetric decrypt properties.
loCrypt = createobject("CkCrypt2")
loSbAlg = createobject("CkStringBuilder")
loSbAlg.Append(loXml.ChilkatPath("saml2:EncryptedAssertion|xenc:EncryptedData|xenc:EncryptionMethod|(Algorithm)"))
if (loSbAlg.Contains("aes128-cbc",.T.) = .T.) 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...
llSuccess = loCrypt.DecryptBd(loBdEncrypted)
if (llSuccess = .F.) 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
return
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>
loXmlAssertion = createobject("CkXml")
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