org.opensaml.xml.signature.impl
Class ChainingSignatureTrustEngine

java.lang.Object
  org.opensaml.xml.signature.impl.ChainingSignatureTrustEngine

All Implemented Interfaces:

TrustEngine<Signature>, SignatureTrustEngine

public class ChainingSignatureTrustEngine
extends Object
implements SignatureTrustEngine

Evaluate a signature in sequence using a chain of subordinate trust engines. If the signature may be established as trusted by any of the subordinate engines, the token is considered trusted. Otherwise it is considered untrusted.

Constructor Summary

ChainingSignatureTrustEngine()
Constructor.

Method Summary

List<SignatureTrustEngine>	getChain() Get the list of configured trust engines which constitute the trust evaluation chain.
KeyInfoCredentialResolver	getKeyInfoResolver() Get the KeyInfoCredentialResolver instance used to resolve (advisory) signing credential information from KeyInfo elements contained within a Signature element.
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 token, CriteriaSet trustBasisCriteria) Validates the token against trusted information obtained in an implementation-specific manner.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChainingSignatureTrustEngine

public ChainingSignatureTrustEngine()

Constructor.

Method Detail

getChain

public List<SignatureTrustEngine> getChain()

Get the list of configured trust engines which constitute the trust evaluation chain.

Returns:

the modifiable list of trust engines in the chain

getKeyInfoResolver

public KeyInfoCredentialResolver getKeyInfoResolver()

Get the KeyInfoCredentialResolver instance used to resolve (advisory) signing credential information from KeyInfo elements contained within a Signature element. Note that credential(s) obtained via this resolver are not themselves trusted. They must be evaluated against the trusted credential information obtained from the trusted credential resolver.

Specified by:

getKeyInfoResolver in interface SignatureTrustEngine

Returns:

a KeyInfoCredentialResolver instance

validate

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

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

Specified by:

validate in interface TrustEngine<Signature>

Parameters:

token - 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