Hi, I'm following the guidelines of configuring a SAML service in CAS, but 
I'm having trouble connecting to Liferay portal.

In Liferay were created the certificates and imported in the idp-metadata 
file which was sent back to Liferay and imported. Everything runs fine, BUT 
after entering the credentials in CAS, this error (or similar) appears in 
Liferay logs:

2024-10-04 21:51:11.830 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][ApacheSantuarioSignatureValidationProviderImpl:65]
 
Validating signature with signature algorithm URI: 
http://www.w3.org/2001/04/xmldsig-more#rsa-sha256
2024-10-04 21:51:11.830 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][ApacheSantuarioSignatureValidationProviderImpl:66]
 
Validation credential key algorithm 'RSA', key instance class 
'sun.security.rsa.RSAPublicKeyImpl'
2024-10-04 21:51:11.831 WARN 
 [http-nio-0.0.0.0-9444-exec-4][XMLSignature:891] Signature verification 
failed.
2024-10-04 21:51:11.831 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][ApacheSantuarioSignatureValidationProviderImpl:78]
 
Signature cryptographic validation not successful
2024-10-04 21:51:11.831 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][BaseSignatureTrustEngine:244] Signature 
validation using candidate validation credential failed
org.opensaml.xmlsec.signature.support.SignatureException: Signature 
cryptographic validation not successful
.....
2024-10-04 21:51:11.832 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][ExplicitKeySignatureTrustEngine:124] Failed 
to verify signature using either KeyInfo-derived or directly trusted 
credentials
2024-10-04 21:51:11.833 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][SAMLProtocolMessageXMLSignatureSecurityHandler:142]
 
Message Handler:  Validation of protocol message signature failed for 
context issuer 'ENTITY_ID', message type: 
{urn:oasis:names:tc:SAML:2.0:protocol}Response
2024-10-04 21:51:11.833 DEBUG 
[http-nio-0.0.0.0-9444-exec-4][WebSsoProfileImpl:210] Validation of 
protocol message signature failed
.....

According to the Liferay admin, the main issue may come from CAS, because 
is not using the right key to generate the values in the SAML Response. 
Other reason may be encryption or signature.
I have tried both encryption and signature options in service.json file, 
but no avail, the errors are th same.
How can I verify this suspicions of Liferay admin? how can I force CAS to 
use a certain private key to generate the data in SAML response?

Thanks in advance.

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