diff --git a/pgpainless-core/src/main/kotlin/org/pgpainless/bouncycastle/PolicyAdapter.kt b/pgpainless-core/src/main/kotlin/org/pgpainless/bouncycastle/PolicyAdapter.kt
index eed5e24c..bb8e9f0f 100644
--- a/pgpainless-core/src/main/kotlin/org/pgpainless/bouncycastle/PolicyAdapter.kt
+++ b/pgpainless-core/src/main/kotlin/org/pgpainless/bouncycastle/PolicyAdapter.kt
@@ -9,8 +9,16 @@ import org.bouncycastle.openpgp.api.OpenPGPPolicy
 import org.bouncycastle.openpgp.api.OpenPGPPolicy.OpenPGPNotationRegistry
 import org.pgpainless.policy.Policy
 
+/** Adapter class that adapts a PGPainless [Policy] object to Bouncy Castles [OpenPGPPolicy]. */
 class PolicyAdapter(val policy: Policy = Policy.getInstance()) : OpenPGPPolicy {
 
+    /**
+     * Determine, whether the hash algorithm of a document signature is acceptable.
+     *
+     * @param algorithmId hash algorithm ID
+     * @param signatureCreationTime optional signature creation time
+     * @return boolean indicating whether the hash algorithm is acceptable
+     */
     override fun isAcceptableDocumentSignatureHashAlgorithm(
         algorithmId: Int,
         signatureCreationTime: Date?
@@ -21,6 +29,13 @@ class PolicyAdapter(val policy: Policy = Policy.getInstance()) : OpenPGPPolicy {
             policy.dataSignatureHashAlgorithmPolicy.isAcceptable(algorithmId, signatureCreationTime)
     }
 
+    /**
+     * Determine, whether the hash algorithm of a revocation signature is acceptable.
+     *
+     * @param algorithmId hash algorithm ID
+     * @param revocationCreationTime optional revocation signature creation time
+     * @return boolean indicating whether the hash algorithm is acceptable
+     */
     override fun isAcceptableRevocationSignatureHashAlgorithm(
         algorithmId: Int,
         revocationCreationTime: Date?
@@ -32,6 +47,13 @@ class PolicyAdapter(val policy: Policy = Policy.getInstance()) : OpenPGPPolicy {
                 algorithmId, revocationCreationTime)
     }
 
+    /**
+     * Determine, whether the hash algorithm of a certification signature is acceptable.
+     *
+     * @param algorithmId hash algorithm ID
+     * @param certificationCreationTime optional certification signature creation time
+     * @return boolean indicating whether the hash algorithm is acceptable
+     */
     override fun isAcceptableCertificationSignatureHashAlgorithm(
         algorithmId: Int,
         certificationCreationTime: Date?
@@ -43,32 +65,76 @@ class PolicyAdapter(val policy: Policy = Policy.getInstance()) : OpenPGPPolicy {
                 algorithmId, certificationCreationTime)
     }
 
+    /**
+     * Return the default hash algorithm for certification signatures. This is used as fallback if
+     * not suitable hash algorithm can be negotiated.
+     *
+     * @return default certification signature hash algorithm
+     */
     override fun getDefaultCertificationSignatureHashAlgorithm(): Int {
         return policy.certificationSignatureHashAlgorithmPolicy.defaultHashAlgorithm.algorithmId
     }
 
+    /**
+     * Return the default hash algorithm for document signatures. This is used as fallback if not
+     * suitable hash algorithm can be negotiated.
+     *
+     * @return default document signature hash algorithm
+     */
     override fun getDefaultDocumentSignatureHashAlgorithm(): Int {
         return policy.dataSignatureHashAlgorithmPolicy.defaultHashAlgorithm.algorithmId
     }
 
-    override fun isAcceptableSymmetricKeyAlgorithm(p0: Int): Boolean {
-        return policy.symmetricKeyEncryptionAlgorithmPolicy.isAcceptable(p0)
+    /**
+     * Determine, whether the given symmetric encryption algorithm is acceptable.
+     *
+     * @param algorithmId symmetric encryption algorithm ID
+     * @return boolean indicating, whether the encryption algorithm is acceptable
+     */
+    override fun isAcceptableSymmetricKeyAlgorithm(algorithmId: Int): Boolean {
+        return policy.symmetricKeyEncryptionAlgorithmPolicy.isAcceptable(algorithmId)
     }
-
+    /**
+     * Return the default symmetric encryption algorithm. This algorithm is used as fallback to
+     * encrypt messages if no suitable symmetric encryption algorithm can be negotiated.
+     *
+     * @return default symmetric encryption algorithm
+     */
     override fun getDefaultSymmetricKeyAlgorithm(): Int {
         return policy.symmetricKeyEncryptionAlgorithmPolicy.defaultSymmetricKeyAlgorithm.algorithmId
     }
 
+    /**
+     * Determine, whether the [bitStrength] of an asymmetric public key of the given algorithm is
+     * strong enough.
+     *
+     * @param algorithmId public key algorithm ID
+     * @param bitStrength strength of the key in bits
+     * @return boolean indicating whether the bit strength is sufficient
+     */
     override fun isAcceptablePublicKeyStrength(algorithmId: Int, bitStrength: Int): Boolean {
         return policy.publicKeyAlgorithmPolicy.isAcceptable(algorithmId, bitStrength)
     }
 
-    override fun getNotationRegistry(): OpenPGPPolicy.OpenPGPNotationRegistry {
+    /**
+     * Adapt PGPainless' [org.pgpainless.util.NotationRegistry] to Bouncy Castles
+     * [OpenPGPNotationRegistry].
+     *
+     * @return adapted [OpenPGPNotationRegistry]
+     */
+    override fun getNotationRegistry(): OpenPGPNotationRegistry {
         return object : OpenPGPNotationRegistry() {
+
+            /** Determine, whether the given [notationName] is known by the registry. */
             override fun isNotationKnown(notationName: String?): Boolean {
                 return notationName?.let { policy.notationRegistry.isKnownNotation(it) } ?: false
             }
 
+            /**
+             * Add a known notation name to the registry.
+             *
+             * @param notationName notation name
+             */
             override fun addKnownNotation(notationName: String?) {
                 notationName?.let { policy.notationRegistry.addKnownNotation(it) }
             }