///

## Password hashing

"Hashing" means converting some content (a password in this case) into a sequence of bytes (just a string) that looks like gibberish.

Whenever you pass exactly the same content (exactly the same password) you get exactly the same gibberish.

But you cannot convert from the gibberish back to the password.

### Why use password hashing

package org.codelibs.fess.ds;

import java.io.File;
import java.io.InputStream;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

import javax.xml.parsers.DocumentBuilder;

 */
package org.codelibs.fess.entity;

import static org.codelibs.core.stream.StreamUtil.stream;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.Constants;

import java.io.Writer;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;

import org.apache.maven.api.di.Named;

@SupportedAnnotationTypes("org.apache.maven.api.di.Named")
@SupportedSourceVersion(SourceVersion.RELEASE_17)
public class DiIndexProcessor extends AbstractProcessor {

    private final Set<String> processedClasses = new HashSet<>();

    @Override

 * under the License.
 */
package org.apache.maven.model.composition;

import javax.inject.Named;
import javax.inject.Singleton;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

import org.apache.maven.api.model.Dependency;

            if (aces != null) {
                responseData.addMetaData(SMB_ACCESS_CONTROL_ENTRIES, aces); // backward compatibility
                final Set<SID> sidAllowSet = new HashSet<>();
                final Set<SID> sidDenySet = new HashSet<>();
                for (final ACE ace : aces) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("ACE:{}", ace);
                    }

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.repository.internal;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

import org.apache.maven.api.model.Dependency;
import org.apache.maven.api.model.Parent;

 */
public class HtmlToXmlJavadocLexer implements JavadocLexer {
    private final JavadocLexer lexer;
    private final Set<String> blockElements = new HashSet<String>();
    private final Set<String> blockContent = new HashSet<String>();

    public HtmlToXmlJavadocLexer(JavadocLexer lexer) {
        this.lexer = lexer;
        blockElements.add("p");
        blockElements.add("pre");

      LocalCache<Object, Object> map = makeLocalCache(builder);

      Object keyOne = new Object();
      Object valueOne = new Object();
      int hashOne = map.hash(keyOne);
      ReferenceEntry<Object, Object> entryOne = map.newEntry(keyOne, hashOne, null);
      ValueReference<Object, Object> valueRefOne = map.newValueReference(entryOne, valueOne, 1);
      assertSame(valueOne, valueRefOne.get());

      LocalCache<Object, Object> map = makeLocalCache(builder);

      Object keyOne = new Object();
      Object valueOne = new Object();
      int hashOne = map.hash(keyOne);
      ReferenceEntry<Object, Object> entryOne = map.newEntry(keyOne, hashOne, null);
      ValueReference<Object, Object> valueRefOne = map.newValueReference(entryOne, valueOne, 1);
      assertSame(valueOne, valueRefOne.get());