org.opensaml.xmlsec.signature.support

Class Signer

java.lang.Object

org.opensaml.xmlsec.signature.support.Signer

public final class Signer
extends Object

A service class which is responsible for cryptographically computing and storing the actual digital signature content held within a Signature instance. This must be done as a separate step in order to support the following cases:

• Multiple signable objects appear in the DOM tree, in which case the order that the objects should be signed in is not known (e.g. object 1 could appear first in the tree, but contain a reference to signable object 2)
• The DOM tree resulting from marshalling of the XMLObject tree is grafted onto another DOM tree which may cause element ID conflicts that would invalidate the signature

Field Summary

Fields

Modifier and Type	Field and Description
private static SignerProvider	signerInstance The cached signer provider instance to use.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Signer() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
private static Logger	getLogger() Get an SLF4J Logger.
private static SignerProvider	getSignerProvider() Obtain the SignerProvider instance to be used.
static void	signObject(Signature signature) Signs a single XMLObject.
static void	signObjects(List<Signature> signatures) Signs the given XMLObject in the order provided.

Methods inherited from class java.lang.Object

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

Field Detail

signerInstance

private static SignerProvider signerInstance

The cached signer provider instance to use.

Constructor Detail

Signer

protected Signer()

Constructor.

Method Detail

signObjects

public static void signObjects(@Nonnull
               List<Signature> signatures)
                        throws SignatureException

Signs the given XMLObject in the order provided.

Parameters:

signatures - an ordered list of XMLObject to be signed

Throws:

SignatureException - thrown if there is an error computing the signature

signObject

public static void signObject(@Nonnull
              Signature signature)
                       throws SignatureException

Signs a single XMLObject.

Parameters:

signature - the signature to compute the signature on

Throws:

SignatureException - thrown if there is an error computing the signature

getSignerProvider

@Nonnull
private static SignerProvider getSignerProvider()
                                         throws SignatureException

Obtain the SignerProvider instance to be used.

Returns:

the SignerProvider

Throws:

SignatureException - if a SignerProvider could not be loaded

getLogger

@Nonnull
private static Logger getLogger()

Get an SLF4J Logger.

Returns:

a Logger instance