docs: add docs for loading RSA public key with modulus and exponent

Author: siujamo

key-pair-loader/src/main/java/com/onixbyte/security/KeyLoader.java

@@ -19,9 +19,11 @@
 
 import com.onixbyte.security.exception.KeyLoadingException;
 
+import java.security.KeyFactory;
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.interfaces.RSAPublicKey;
+import java.security.spec.KeySpec;
 
 /**
  * The {@code KeyLoader} class provides utility methods for loading keys pairs from PEM-formatted
@@ -52,6 +54,15 @@ public interface KeyLoader {
      */
     PublicKey loadPublicKey(String pemKeyText);
 
+    /**
+     * Get the public key with given modulus and public exponent.
+     *
+     * @param modulus  the modulus
+     * @param exponent the public exponent
+     * @return generated public key object from the provided key specification
+     * @see KeyFactory#getInstance(String)
+     * @see KeyFactory#generatePublic(KeySpec)
+     */
     default RSAPublicKey loadPublicKey(String modulus, String exponent) {
         throw new KeyLoadingException("This key loader does not support RSA Public key loading.");
     }

key-pair-loader/src/main/java/com/onixbyte/security/impl/RSAKeyLoader.java

@@ -25,10 +25,7 @@
 import java.security.NoSuchAlgorithmException;
 import java.security.interfaces.RSAPrivateKey;
 import java.security.interfaces.RSAPublicKey;
-import java.security.spec.InvalidKeySpecException;
-import java.security.spec.PKCS8EncodedKeySpec;
-import java.security.spec.RSAPublicKeySpec;
-import java.security.spec.X509EncodedKeySpec;
+import java.security.spec.*;
 import java.util.Base64;
 
 /**
@@ -140,6 +137,15 @@ public RSAPublicKey loadPublicKey(String pemKeyText) {
         }
     }
 
+    /**
+     * Get the public key with given modulus and public exponent.
+     *
+     * @param modulus  the modulus
+     * @param exponent the public exponent
+     * @return generated public key object from the provided key specification
+     * @see KeyFactory#getInstance(String)
+     * @see KeyFactory#generatePublic(KeySpec)
+     */
     @Override
     public RSAPublicKey loadPublicKey(String modulus, String exponent) {
         try {