Add javadoc to the EncryptedPKCS8Parser class

private-key-pem-parser/src/main/java/io/smallrye/certs/pem/parsers/EncryptedPKCS8Parser.java

@@ -20,6 +20,9 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+/**
+ * Parser for PKCS#8 format encrypted private keys.
+ */
 public class EncryptedPKCS8Parser implements PKPemParser {
 
     private static final String PKCS8_ENCRYPTED_START = "-+BEGIN\\s+ENCRYPTED\\s+PRIVATE\\s+KEY[^-]*-+(?:\\s|\\r|\\n)+";
@@ -34,6 +37,12 @@ public class EncryptedPKCS8Parser implements PKPemParser {
     public EncryptedPKCS8Parser() {
     }
 
+    /**
+     * Extracts the private key from the encrypted PKCS#8 format.
+     * @param content the encrypted PKCS#8 content
+     * @param password the password to decrypt the key
+     * @return the private key or {@code null} if the content is not a PKCS#8 encrypted key
+     */
     @Override
     public PrivateKey getKey(String content, String password) {
         try {
@@ -87,6 +96,12 @@ private static String getEncryptionAlgorithm(AlgorithmParameters algParameters,
         return algName;
     }
 
+    /**
+     * Retrieves the private key as plain PKCS#8 from the encrypted PKCS#8 content.
+     * @param content the encrypted PKCS#8 content
+     * @param secret the password to decrypt the key
+     * @return the decrypted PKCS#8 key or {@code null} if the content is not a PKCS#8 encrypted key
+     */
     public Buffer decryptKey(String content, String secret) {
         var pk = getKey(content, secret);
         if (pk == null) {