#1138 Show warning for hashes that will be deprecated in 5.4

- Introduce Usage.DEPRECATED to mark the hash algorithms accordingly
- Log warning when such a deprecated hash algorithm is used
- Update hash algorithms doc page

src/main/java/fr/xephi/authme/security/crypts/DoubleMd5.java

@@ -1,7 +1,11 @@
 package fr.xephi.authme.security.crypts;
 
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
+
 import static fr.xephi.authme.security.HashUtils.md5;
 
+@Recommendation(Usage.DEPRECATED)
 public class DoubleMd5 extends UnsaltedMethod {
 
     @Override

src/main/java/fr/xephi/authme/security/crypts/Md5.java

@@ -1,7 +1,10 @@
 package fr.xephi.authme.security.crypts;
 
 import fr.xephi.authme.security.HashUtils;
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
 
+@Recommendation(Usage.DEPRECATED)
 public class Md5 extends UnsaltedMethod {
 
     @Override

src/main/java/fr/xephi/authme/security/crypts/PlainText.java

@@ -1,11 +1,15 @@
 package fr.xephi.authme.security.crypts;
 
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
+
 /**
  * Plaintext password storage.
  *
  * @deprecated Using this is no longer supported. AuthMe will migrate to SHA256 on startup.
  */
 @Deprecated
+@Recommendation(Usage.DEPRECATED)
 public class PlainText extends UnsaltedMethod {
 
     @Override

src/main/java/fr/xephi/authme/security/crypts/Sha1.java

@@ -1,7 +1,10 @@
 package fr.xephi.authme.security.crypts;
 
 import fr.xephi.authme.security.HashUtils;
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
 
+@Recommendation(Usage.DEPRECATED)
 public class Sha1 extends UnsaltedMethod {
 
     @Override

src/main/java/fr/xephi/authme/security/crypts/Sha512.java

@@ -1,7 +1,10 @@
 package fr.xephi.authme.security.crypts;
 
 import fr.xephi.authme.security.HashUtils;
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
 
+@Recommendation(Usage.DEPRECATED)
 public class Sha512 extends UnsaltedMethod {
 
     @Override

src/main/java/fr/xephi/authme/security/crypts/Whirlpool.java

@@ -59,8 +59,12 @@ package fr.xephi.authme.security.crypts;
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.Usage;
+
 import java.util.Arrays;
 
+@Recommendation(Usage.DEPRECATED)
 public class Whirlpool extends UnsaltedMethod {
 
     /**

src/main/java/fr/xephi/authme/security/crypts/description/Usage.java

@@ -20,6 +20,9 @@ public enum Usage {
     /** Hash algorithm is not recommended to be used. Use only if required by another system. */
     DO_NOT_USE,
 
+    /** Algorithm that is or will be no longer supported actively. */
+    DEPRECATED,
+
     /** The algorithm does not work properly; do not use. */
     DOES_NOT_WORK