org.opensaml.xml.signature.impl
Class ExplicitKeySignatureTrustEngine

java.lang.Object
  org.opensaml.xml.signature.impl.BaseSignatureTrustEngine<Iterable<Credential>>
      org.opensaml.xml.signature.impl.ExplicitKeySignatureTrustEngine

All Implemented Interfaces:

TrustedCredentialTrustEngine<Signature>, TrustEngine<Signature>, SignatureTrustEngine

public class ExplicitKeySignatureTrustEngine
extends BaseSignatureTrustEngine<Iterable<Credential>>
implements TrustedCredentialTrustEngine<Signature>

An implementation of SignatureTrustEngine which evaluates the validity and trustworthiness of XML and raw signatures.

Processing is first performed as described in BaseSignatureTrustEngine. If based on this processing, it is determined that the Signature's KeyInfo is not present or does not contain a resolveable valid (and trusted) signing key, then all trusted credentials obtained by the trusted credential resolver will be used to attempt to validate the signature.

Constructor Summary

ExplicitKeySignatureTrustEngine(CredentialResolver resolver, KeyInfoCredentialResolver keyInfoResolver)
Constructor.

Method Summary

protected boolean	evaluateTrust(Credential untrustedCredential, Iterable<Credential> trustedCredentials) Evaluate the untrusted KeyInfo-derived credential with respect to the specified trusted information.
CredentialResolver	getCredentialResolver() Gets the credential resolver used to recover trusted credentials that may be used to validate tokens.
boolean	validate(byte[] signature, byte[] content, String algorithmURI, CriteriaSet trustBasisCriteria, Credential candidateCredential) Determines whether a raw signature over specified content is valid and signed by a trusted credential.
boolean	validate(Signature signature, CriteriaSet trustBasisCriteria) Validates the token against trusted information obtained in an implementation-specific manner.

Methods inherited from class org.opensaml.xml.signature.impl.BaseSignatureTrustEngine

checkParams, checkParamsRaw, getKeyInfoResolver, validate, verifySignature

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExplicitKeySignatureTrustEngine

public ExplicitKeySignatureTrustEngine(CredentialResolver resolver,
                                       KeyInfoCredentialResolver keyInfoResolver)

Constructor.

Parameters:

resolver - credential resolver used to resolve trusted credentials.

keyInfoResolver - KeyInfo credential resolver used to obtain the (advisory) signing credential from a Signature's KeyInfo element.

Method Detail

getCredentialResolver

public CredentialResolver getCredentialResolver()

Gets the credential resolver used to recover trusted credentials that may be used to validate tokens.

Specified by:

getCredentialResolver in interface TrustedCredentialTrustEngine<Signature>

Returns:

credential resolver used to recover trusted credentials that may be used to validate tokens

validate

public boolean validate(Signature signature,
                        CriteriaSet trustBasisCriteria)
                 throws SecurityException

Validates the token against trusted information obtained in an implementation-specific manner.

Specified by:

validate in interface TrustEngine<Signature>

Parameters:

signature - security token to validate

trustBasisCriteria - criteria used to describe and/or resolve the information which serves as the basis for trust evaluation

Returns:

true if the token is trusted and valid, false if not

Throws:

SecurityException - thrown if there is a problem validating the security token

validate

public boolean validate(byte[] signature,
                        byte[] content,
                        String algorithmURI,
                        CriteriaSet trustBasisCriteria,
                        Credential candidateCredential)
                 throws SecurityException

Determines whether a raw signature over specified content is valid and signed by a trusted credential.

A candidate verification credential may optionally be supplied. If one is supplied and is determined to successfully verify the signature, an attempt will be made to establish trust on this basis.

If a candidate credential is not supplied, or it does not successfully verify the signature, some implementations may be able to resolve candidate verification credential(s) in an implementation-specific manner based on the trusted criteria supplied, and then attempt to verify the signature and establish trust on this basis.

Specified by:

validate in interface SignatureTrustEngine

Parameters:

signature - the signature value

content - the content that was signed

algorithmURI - the signature algorithm URI which was used to sign the content

trustBasisCriteria - criteria used to describe and/or resolve the information which serves as the basis for trust evaluation

candidateCredential - the untrusted candidate credential containing the validation key for the signature (optional)

Returns:

true if the signature was valid for the provided content and was signed by a key contained within a credential established as trusted based on the supplied criteria, otherwise false

Throws:

SecurityException - thrown if there is a problem attempting to verify the signature such as the signature algorithim not being supported

evaluateTrust

protected boolean evaluateTrust(Credential untrustedCredential,
                                Iterable<Credential> trustedCredentials)
                         throws SecurityException

Evaluate the untrusted KeyInfo-derived credential with respect to the specified trusted information.

Specified by:

evaluateTrust in class BaseSignatureTrustEngine<Iterable<Credential>>

Parameters:

untrustedCredential - the untrusted credential being evaluated

trustedCredentials - the information which serves as the basis for trust evaluation

Returns:

true if the trust can be established for the untrusted credential, otherwise false

Throws:

SecurityException - if an error occurs during trust processing