import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
/**
 * Searches the library wide KeyResolvers for public keys
 *
 * @return The public key contained in this Node.
 * @throws KeyResolverException
 */
PublicKey getPublicKeyFromStaticResolvers() throws KeyResolverException {
    Iterator<KeyResolverSpi> it = KeyResolver.iterator();
    while (it.hasNext()) {
        KeyResolverSpi keyResolver = it.next();
        keyResolver.setSecureValidation(secureValidation);
        Node currentChild = this.constructionElement.getFirstChild();
        String uri = this.getBaseURI();
        while (currentChild != null) {
            if (currentChild.getNodeType() == Node.ELEMENT_NODE) {
                for (StorageResolver storage : storageResolvers) {
                    PublicKey pk =
                        keyResolver.engineLookupAndResolvePublicKey(
                            (Element) currentChild, uri, storage
                        );

                    if (pk != null) {
                        return pk;
                    }
                }
            }
            currentChild = currentChild.getNextSibling();
        }
    }
    return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
/**
 * This method uses each System-wide {@link KeyResolver} to search the
 * child elements. Each combination of {@link KeyResolver} and child element
 * is checked against all {@link StorageResolver}s.
 *
 * @return The certificate contained in this KeyInfo
 * @throws KeyResolverException
 */
X509Certificate getX509CertificateFromStaticResolvers()
    throws KeyResolverException {
    if (log.isLoggable(java.util.logging.Level.FINE)) {
        log.log(java.util.logging.Level.FINE,
            "Start getX509CertificateFromStaticResolvers() with " + KeyResolver.length()
            + " resolvers"
        );
    }
    String uri = this.getBaseURI();
    Iterator<KeyResolverSpi> it = KeyResolver.iterator();
    while (it.hasNext()) {
        KeyResolverSpi keyResolver = it.next();
        keyResolver.setSecureValidation(secureValidation);
        X509Certificate cert = applyCurrentResolver(uri, keyResolver);
        if (cert != null) {
            return cert;
        }
    }
    return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
private X509Certificate applyCurrentResolver(
    String uri, KeyResolverSpi keyResolver
) throws KeyResolverException {
    Node currentChild = this.constructionElement.getFirstChild();
    while (currentChild != null)      {
        if (currentChild.getNodeType() == Node.ELEMENT_NODE) {
            for (StorageResolver storage : storageResolvers) {
                X509Certificate cert =
                    keyResolver.engineLookupResolveX509Certificate(
                        (Element) currentChild, uri, storage
                    );

                if (cert != null) {
                    return cert;
                }
            }
        }
        currentChild = currentChild.getNextSibling();
    }
    return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
/**
 * Method getX509CertificateFromInternalResolvers
 *
 * @return The certificate contained in this KeyInfo
 * @throws KeyResolverException
 */
X509Certificate getX509CertificateFromInternalResolvers()
    throws KeyResolverException {
    if (log.isLoggable(java.util.logging.Level.FINE)) {
        log.log(java.util.logging.Level.FINE,
            "Start getX509CertificateFromInternalResolvers() with "
            + this.lengthInternalKeyResolver() + " resolvers"
        );
    }
    String uri = this.getBaseURI();
    for (KeyResolverSpi keyResolver : internalKeyResolvers) {
        if (log.isLoggable(java.util.logging.Level.FINE)) {
            log.log(java.util.logging.Level.FINE, "Try " + keyResolver.getClass().getName());
        }
        keyResolver.setSecureValidation(secureValidation);
        X509Certificate cert = applyCurrentResolver(uri, keyResolver);
        if (cert != null) {
            return cert;
        }
    }

    return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
/**
 * Searches the per-KeyInfo KeyResolvers for public keys
 *
 * @return The public key contained in this Node.
 * @throws KeyResolverException
 */
PublicKey getPublicKeyFromInternalResolvers() throws KeyResolverException {
    for (KeyResolverSpi keyResolver : internalKeyResolvers) {
        if (log.isLoggable(java.util.logging.Level.FINE)) {
            log.log(java.util.logging.Level.FINE, "Try " + keyResolver.getClass().getName());
        }
        keyResolver.setSecureValidation(secureValidation);
        Node currentChild = this.constructionElement.getFirstChild();
        String uri = this.getBaseURI();
        while (currentChild != null)      {
            if (currentChild.getNodeType() == Node.ELEMENT_NODE) {
                for (StorageResolver storage : storageResolvers) {
                    PublicKey pk =
                        keyResolver.engineLookupAndResolvePublicKey(
                            (Element) currentChild, uri, storage
                        );

                    if (pk != null) {
                        return pk;
                    }
                }
            }
            currentChild = currentChild.getNextSibling();
        }
    }

    return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
private X509Certificate applyCurrentResolver(String uri, int storageLength, KeyResolverSpi keyResolver) throws KeyResolverException {
        Node currentChild=this._constructionElement.getFirstChild();
        while (currentChild!=null)      {
                if (currentChild.getNodeType() == Node.ELEMENT_NODE) {
            for (int k = 0; k < storageLength; k++) {
                StorageResolver storage =
                   (StorageResolver) this._storageResolvers.get(k);

                X509Certificate cert = keyResolver
                     .engineLookupResolveX509Certificate((Element) currentChild, uri,
                                     storage);

                if (cert != null) {
                    return cert;
               }
            }
         }
         currentChild=currentChild.getNextSibling();
      }
      return null;
}
 

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi; //导入依赖的package包/类
/**
 * Method getX509CertificateFromInternalResolvers
 *
 * @return The certificate contined in this KeyInfo
 * @throws KeyResolverException
 */
X509Certificate getX509CertificateFromInternalResolvers()
        throws KeyResolverException {
   if (log.isLoggable(java.util.logging.Level.FINE))
     log.log(java.util.logging.Level.FINE, "Start getX509CertificateFromInternalResolvers() with "
             + this.lengthInternalKeyResolver() + " resolvers");
   String uri=this.getBaseURI();
   int storageLength=this._storageResolvers.size();
   for (int i = 0; i < this.lengthInternalKeyResolver(); i++) {
      KeyResolverSpi keyResolver = this.itemInternalKeyResolver(i);
      if (log.isLoggable(java.util.logging.Level.FINE))
             log.log(java.util.logging.Level.FINE, "Try " + keyResolver.getClass().getName());
      X509Certificate cert= applyCurrentResolver(uri, storageLength, keyResolver);
      if (cert!=null) {
              return cert;
      }
   }

   return null;
}