[ELY-489] Add JavaDoc for the 'org.wildfly.security.mechanism' packag…

…e and sub packages

mechanism/base/src/main/java/org/wildfly/security/mechanism/AuthenticationMechanismException.java

@@ -102,6 +102,14 @@ public static AuthenticationMechanismException fromException(final Exception sou
         return copyContents(source, new AuthenticationMechanismException(source.getMessage(), source.getCause()));
     }
 
+    /**
+     * Copies the stack trace and suppressed exceptions from a source exception to a specified throwable.
+     *
+     * @param source the source exception from which the stack trace and suppressed exceptions should be copied.
+     * @param throwable the throwable to which the contents should be copied.
+     * @param <T> the type of throwable to which the contents should be copied.
+     * @return the throwable that was passed in as a parameter, with the contents copied from the source exception.
+     */
     private static <T extends Throwable> T copyContents(final Exception source, final T throwable) {
         throwable.setStackTrace(source.getStackTrace());
         final Throwable[] suppressed = source.getSuppressed();

mechanism/base/src/main/java/org/wildfly/security/mechanism/MechanismUtil.java

@@ -57,6 +57,7 @@ private MechanismUtil() {}
      * @param providers the security providers to use with the {@link PasswordFactory}
      * @param <S> the password type
      * @return the password
+     * @throws AuthenticationMechanismException if there is an error retrieving the password
      */
     @Deprecated
     public static <S extends Password> S getPasswordCredential(String userName, CallbackHandler callbackHandler, Class<S> passwordType, String passwordAlgorithm, AlgorithmParameterSpec matchParameters, AlgorithmParameterSpec generateParameters, Supplier<Provider[]> providers) throws AuthenticationMechanismException {
@@ -78,6 +79,7 @@ public static <S extends Password> S getPasswordCredential(String userName, Call
      * @param <S> the password type
      * @param log mechanism specific logger
      * @return the password
+     * @throws AuthenticationMechanismException if there is an error retrieving the password
      */
     @Deprecated
     public static <S extends Password> S getPasswordCredential(String userName, CallbackHandler callbackHandler, Class<S> passwordType, String passwordAlgorithm, AlgorithmParameterSpec matchParameters, AlgorithmParameterSpec generateParameters, Supplier<Provider[]> providers, ElytronMessages log) throws AuthenticationMechanismException {

mechanism/base/src/main/java/org/wildfly/security/mechanism/ScramServerErrorCode.java

@@ -45,6 +45,9 @@ public enum ScramServerErrorCode {
     private final String text;
     private final byte[] messageBytes;
 
+    /**
+     * Creates an error code instance with a String representation and a byte array for error message.
+     */
     ScramServerErrorCode() {
         text = name().replace('_', '-').toLowerCase(Locale.US);
         final int length = text.length();
@@ -54,14 +57,29 @@ public enum ScramServerErrorCode {
         messageBytes = msg;
     }
 
+    /**
+     * Returns the String representation of the error code.
+     *
+     * @return String representation of the error code.
+     */
     public String getText() {
         return text;
     }
 
+    /**
+     * Returns the copy of the byte array representing the error message.
+     *
+     * @return copy of the byte array representing the error message.
+     */
     public byte[] getMessageBytes() {
         return messageBytes.clone();
     }
 
+    /**
+     * Returns the byte array representing the error message.
+     *
+     * @return the byte array representing the error message.
+     */
     byte[] getRawMessageBytes() {
         return messageBytes;
     }

mechanism/base/src/main/java/org/wildfly/security/mechanism/ScramServerException.java

@@ -83,6 +83,11 @@ public String getMessage() {
         return super.getMessage() + ": " + error.getText();
     }
 
+    /**
+     * Returns the error code of the exception.
+     *
+     * @return the error code of the exception.
+     */
     public ScramServerErrorCode getError() {
         return error;
     }

mechanism/base/src/main/java/org/wildfly/security/mechanism/_private/MechanismUtil.java

@@ -67,6 +67,7 @@ private MechanismUtil() {}
      * @param <S> the password type
      * @param log mechanism specific logger
      * @return the password
+     * @throws AuthenticationMechanismException if there is an error retrieving the password
      */
     public static <S extends Password> S getPasswordCredential(String userName, CallbackHandler callbackHandler, Class<S> passwordType, String passwordAlgorithm, AlgorithmParameterSpec matchParameters, AlgorithmParameterSpec generateParameters, Supplier<Provider[]> providers, ElytronMessages log) throws AuthenticationMechanismException {
         Assert.checkNotNullParam("userName", userName);
@@ -168,6 +169,7 @@ public static void handleCallbacks(ElytronMessages log, CallbackHandler callback
      * @param scope the HTTP scope to store computed value (must not be {@code null})
      * @param key the key to retrieve (must not be {@code null})
      * @param mappingFunction the function to apply to acquire the value (must not be {@code null})
+     * @param <R> the type of returned value
      * @return the stored or new value (not {@code null})
      */
     public static <R> R computeIfAbsent(HttpScope scope, String key, Function<String, R> mappingFunction) {

mechanism/digest/src/main/java/org/wildfly/security/mechanism/digest/DigestQuote.java

@@ -21,7 +21,7 @@
 import org.wildfly.common.bytes.ByteStringBuilder;
 
 /**
- * Utility class used to convert string to quoted strings
+ * Utility class used to convert string to quoted strings.
  *
  * @author <a href="mailto:[email protected]">Peter Skopek</a>
  *
@@ -33,6 +33,12 @@ public class DigestQuote {
     private DigestQuote() {
     }
 
+    /**
+     * Checks if a given character needs to be quoted.
+     *
+     * @param ch the character to check.
+     * @return {@code true} if the character needs to be quoted, {@code false} otherwise.
+     */
     private static boolean quoteNeeded(char ch) {
         return
                 ch == '"' || // escape char
@@ -46,8 +52,8 @@ private static boolean quoteNeeded(char ch) {
     /**
      * Creates new String quoted by SASL rules.
      *
-     * @param inputStr String to be quoted
-     * @return
+     * @param inputStr String to be quoted.
+     * @return new String with quoted characters.
      */
     public static String quote(String inputStr) {
         int len = inputStr.length();
@@ -64,6 +70,12 @@ public static String quote(String inputStr) {
         return sb.toString();
     }
 
+    /**
+     * Creates new Array quoted by SASL rules.
+     *
+     * @param input Byte array to be quoted.
+     * @return new byte array with quoted bytes.
+     */
     public static byte[] quote(byte[] input) {
         ByteStringBuilder bsb = new ByteStringBuilder();
         for (int i = 0; i < input.length; i++) {

mechanism/digest/src/main/java/org/wildfly/security/mechanism/digest/DigestUtil.java

@@ -30,8 +30,6 @@
 import java.util.HashMap;
 import java.util.function.Supplier;
 
-import javax.security.sasl.SaslException;
-
 import org.wildfly.common.bytes.ByteStringBuilder;
 import org.wildfly.security.mechanism._private.ElytronMessages;
 import org.wildfly.security.mechanism.AuthenticationMechanismException;
@@ -52,9 +50,12 @@ public class DigestUtil {
     /**
      * Client side method to parse challenge sent by server.
      *
-     * @param challenge
-     * @return
-     * @throws AuthenticationMechanismException
+     * @param challenge the byte array representing the authentication challenge to be parsed.
+     * @param charset the charset to decide which whitespace separator is used.
+     * @param multiRealm {@code true} if there are multiple realms in the challenge, {@code false} otherwise
+     * @param log the logger to use.
+     * @return A new HashMap representing response for the parsed challenge
+     * @throws AuthenticationMechanismException if there is an error parsing the challenge
      */
     public static HashMap<String, byte[]> parseResponse(byte [] challenge, Charset charset, boolean multiRealm, ElytronMessages log) throws AuthenticationMechanismException {
 
@@ -170,6 +171,15 @@ else if (expectSeparator) {
         return response;
     }
 
+    /**
+     * Adds a key-value pair to a HashMap representing a parsed challenge.
+     *
+     * @param response the HashMap to add the key-value pair to.
+     * @param keyBuilder the StringBuilder containing the key.
+     * @param valueBuilder the ByteStringBuilder containing the value.
+     * @param realmNumber the current number of realms in the parsed challenge.
+     * @return the updated number of realms in the parsed challenge.
+     */
     private static int addToParsedChallenge(HashMap<String, byte[]> response, StringBuilder keyBuilder, ByteStringBuilder valueBuilder, int realmNumber) {
         String k = keyBuilder.toString();
         byte[] v = valueBuilder.toArray();
@@ -183,6 +193,13 @@ private static int addToParsedChallenge(HashMap<String, byte[]> response, String
         return realmNumber;
     }
 
+    /**
+     * Finds the next non-whitespace character in a byte array.
+     *
+     * @param buffer the byte array to search in.
+     * @param startPoint the starting point in the buffer to begin the search.
+     * @return the index of the next non-whitespace character.
+     */
     private static int skipWhiteSpace(byte[] buffer, int startPoint) {
         int i = startPoint;
         while (i < buffer.length && isWhiteSpace(buffer[i])) {
@@ -191,6 +208,12 @@ private static int skipWhiteSpace(byte[] buffer, int startPoint) {
         return i;
     }
 
+    /**
+     * Checks if a given byte is a whitespace character.
+     *
+     * @param b the byte to check.
+     * @return {@code true} if the byte is a whitespace character, {@code false} otherwise.
+     */
     private static boolean isWhiteSpace(byte b) {
         if (b == 13)   // CR
             return true;
@@ -204,6 +227,15 @@ else if (b == 32) // SPACE
             return false;
     }
 
+    /**
+     * Digests the concatenated username, realm and password.
+     *
+     * @param messageDigest the message digest algorithm to use when computing the digest.
+     * @param username the username to use when concatenating.
+     * @param realm the realm to use when concatenating.
+     * @param password the password in the form of a char array to use when concatenating.
+     * @return byte array of the digested password.
+     */
     public static byte[] userRealmPasswordDigest(MessageDigest messageDigest, String username, String realm, char[] password) {
         CharsetEncoder latin1Encoder = StandardCharsets.ISO_8859_1.newEncoder();
         latin1Encoder.reset();
@@ -232,10 +264,13 @@ public static byte[] userRealmPasswordDigest(MessageDigest messageDigest, String
     }
 
     /**
-     * Get array of password chars from TwoWayPassword
+     * Get array of password chars from TwoWayPassword.
      *
-     * @return
-     * @throws SaslException
+     * @param password the TwoWayPassword that needs to be processed.
+     * @param providers the supplier for the providers to be used for processing.
+     * @param log the logger to use.
+     * @throws AuthenticationMechanismException if there is an error retrieving the encoded password.
+     * @return encoded password in the form of a char array.
      */
     public static char[] getTwoWayPasswordChars(TwoWayPassword password, Supplier<Provider[]> providers, ElytronMessages log) throws AuthenticationMechanismException {
         if (password == null) {

mechanism/digest/src/main/java/org/wildfly/security/mechanism/digest/PasswordDigestObtainer.java

@@ -45,7 +45,7 @@
 import static org.wildfly.security.mechanism.digest.DigestUtil.userRealmPasswordDigest;
 
 /**
- * Utility class used to obtain username+realm+password using SASL/HTTP mechanism callbacks
+ * Utility class used to obtain username+realm+password using SASL/HTTP mechanism callbacks.
  *
  * @author <a href="mailto:[email protected]">Jan Kalina</a>
  */
@@ -67,6 +67,20 @@ public class PasswordDigestObtainer {
     private RealmCallback realmCallback;
     private NameCallback nameCallback;
 
+    /**
+     * Constructs a new {@code PasswordDigestObtainer} instance.
+     *
+     * @param callbackHandler the callbackHandler to handle the callbacks required to obtain the username and password.
+     * @param defaultUsername the default username to use if a callback is not provided.
+     * @param defaultRealm the default realm to use if a callback is not provided.
+     * @param log the logger to use.
+     * @param credentialAlgorithm the name of the algorithm for obtaining the credential.
+     * @param messageDigest the {@link MessageDigest} used for digesting the password.
+     * @param passwordFactoryProviders the supplier of the providers to use when creating a {@code PasswordFactory} instance.
+     * @param realms the realms to check for a user and password.
+     * @param readOnlyRealmUsername {@code true} if the username passed in the callback can be modified, {@code false} otherwise.
+     * @param skipRealmCallbacks {@code true} if realm callbacks should be skipped, {@code false} otherwise.
+     */
     public PasswordDigestObtainer(CallbackHandler callbackHandler, String defaultUsername, String defaultRealm,
                                   ElytronMessages log, String credentialAlgorithm, MessageDigest messageDigest,
                                   Supplier<Provider[]> passwordFactoryProviders, String[] realms,
@@ -83,14 +97,30 @@ public PasswordDigestObtainer(CallbackHandler callbackHandler, String defaultUse
         this.skipRealmCallbacks = skipRealmCallbacks;
     }
 
+    /**
+     * Returns the username obtained from callback or the default one.
+     *
+     * @return the username obtained from callback or the default one.
+     */
     public String getUsername() {
         return username;
     }
 
+    /**
+     * Returns the realm obtained from callback or the default one.
+     *
+     * @return the realm obtained from callback or the default one.
+     */
     public String getRealm() {
         return realm;
     }
 
+    /**
+     * Handles callbacks for user and password information.
+     *
+     * @return the salted password.
+     * @throws AuthenticationMechanismException if the callback handler does not support credential acquisition.
+     */
     public byte[] handleUserRealmPasswordCallbacks() throws AuthenticationMechanismException {
 
         realmChoiceCallBack = skipRealmCallbacks || realms == null || realms.length <= 1 ? null :
@@ -115,6 +145,12 @@ public byte[] handleUserRealmPasswordCallbacks() throws AuthenticationMechanismE
         throw log.mechCallbackHandlerDoesNotSupportCredentialAcquisition(null);
     }
 
+    /**
+     * Obtains the pre-digested salted password for the {@code username} in the {@code realm}.
+     *
+     * @return the pre-digested salted password if obtained, {@code null} otherwise.
+     * @throws AuthenticationMechanismException if an exception occurs while handling the callbacks.
+     */
     private byte[] getPredigestedSaltedPassword() throws AuthenticationMechanismException {
         if (realmChoiceCallBack != null) {
             try {
@@ -180,6 +216,12 @@ private byte[] getPredigestedSaltedPassword() throws AuthenticationMechanismExce
         return null;
     }
 
+    /**
+     * Obtains the salted password from a two-way callback.
+     *
+     * @return the byte array of the salted password if obtained, {@code null} otherwise.
+     * @throws AuthenticationMechanismException if an error occurs during the process of handling callbacks or obtaining the password.
+     */
     private byte[] getSaltedPasswordFromTwoWay() throws AuthenticationMechanismException {
         if (realmChoiceCallBack != null) {
             try {
@@ -253,6 +295,12 @@ private byte[] getSaltedPasswordFromTwoWay() throws AuthenticationMechanismExcep
         return null;
     }
 
+    /**
+     * Obtains the salted password from a password callback.
+     *
+     * @return the byte array of the salted password.
+     * @throws AuthenticationMechanismException if an error occurs during the process of handling callbacks or obtaining the password.
+     */
     private byte[] getSaltedPasswordFromPasswordCallback() throws AuthenticationMechanismException {
         PasswordCallback passwordCallback = new PasswordCallback("User password: ", false);