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<p style="margin: 10px 0 0 0">Where you asked:</p>
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<p style="margin: 10px 0 0 0">if I understand correctly, then first performs validation via certificate in metadata file, and second - via certificate in response. It is correct? </p>
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<p style="margin: 10px 0 0 0">No, that's not correct at all. The process of validating the signature is conceptually 2 steps: 1) cryptographically validate the signature with a candidate validation key (such as the public key/cert from the signature's KeyInfo) 2) if successful, establish that that key is trusted.</p>
<p style="margin: 10px 0 0 0">The first message is establishing that indeed re # 1, the signature did cryptographically validate successfully against the KeyInfo key. So that's good, nothing wrong there.</p>
<p style="margin: 10px 0 0 0">The second message indicates that that key could not be establishes as trusted. You're using <tt>ExplicitKeySignatureTrustEngine</tt>, so that trust strategy attempts to match the key against those resolved via the trust credential <tt>CredentialResolver</tt> you supplied to it. The message:</p>
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<p style="margin: 10px 0 0 0">2016-06-22 14:17:02,136 <span class="error">[DEBUG]</span> org.opensaml.xml.security.trust.ExplicitKeyTrustEvaluator - No trusted credentials were provided to evaluate against</p>
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<p style="margin: 10px 0 0 0">indicates that it didn't resolve any trusted creds at all. So that's your problem.</p>
<p style="margin: 10px 0 0 0">What sort of credential resolver did you give to the trust engine? Since you mentioned metadata, then I'll assume you're probably using a <tt>MetadataCredentialResolver</tt>. So that means that there are no creds from metadata resolved based on the criteria supplied. So double-check the metadata itself and also the criteria you are supplying: in particular check the entityID in metadata against the one you are supplying at runtime via the <tt>MetadataCredentialResolver</tt>. Also check things like the SAML role QName and SAML protocol URI you are supplying. Also check that the <tt>KeyDescriptor</tt> containing the key is marked with either use="signing" or no 'use' attrib at all. </p>
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