[checkstyle] (javadoc) MissingJavadocMethod
diff --git a/checkstyle-suppressions.xml b/checkstyle-suppressions.xml
index df53a17..ce15414 100644
--- a/checkstyle-suppressions.xml
+++ b/checkstyle-suppressions.xml
@@ -20,4 +20,5 @@
 <!DOCTYPE suppressions PUBLIC "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN" "https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>
   <suppress checks="MissingJavadocType" files=".*\/internal\/.*\.java"/>
+  <suppress checks="MissingJavadocMethod" files=".*\/internal\/.*\.java"/>
 </suppressions>
diff --git a/src/main/java/org/apache/sling/commons/crypto/PasswordProvider.java b/src/main/java/org/apache/sling/commons/crypto/PasswordProvider.java
index 999aaf0..ad7aa8b 100644
--- a/src/main/java/org/apache/sling/commons/crypto/PasswordProvider.java
+++ b/src/main/java/org/apache/sling/commons/crypto/PasswordProvider.java
@@ -29,6 +29,11 @@
 @ProviderType
 public interface PasswordProvider {
 
+    /**
+     * Provides the password.
+     *
+     * @return The password
+     */
     char @NotNull [] getPassword();
 
 }
diff --git a/src/main/java/org/apache/sling/commons/crypto/SaltProvider.java b/src/main/java/org/apache/sling/commons/crypto/SaltProvider.java
index 835cdbc..0899aba 100644
--- a/src/main/java/org/apache/sling/commons/crypto/SaltProvider.java
+++ b/src/main/java/org/apache/sling/commons/crypto/SaltProvider.java
@@ -29,6 +29,11 @@
 @ProviderType
 public interface SaltProvider {
 
+    /**
+     * Provides the salt.
+     *
+     * @return The salt
+     */
     byte @NotNull [] getSalt();
 
 }
diff --git a/src/main/java/org/apache/sling/commons/crypto/SecretKeyProvider.java b/src/main/java/org/apache/sling/commons/crypto/SecretKeyProvider.java
index b6acba0..9a0251f 100644
--- a/src/main/java/org/apache/sling/commons/crypto/SecretKeyProvider.java
+++ b/src/main/java/org/apache/sling/commons/crypto/SecretKeyProvider.java
@@ -31,6 +31,11 @@
 @ProviderType
 public interface SecretKeyProvider {
 
+    /**
+     * Provides the secret key.
+     *
+     * @return The secret key
+     */
     @NotNull SecretKey getSecretKey();
 
 }