diff --git a/pgp-certificate-store/build.gradle b/pgp-certificate-store/build.gradle
index 8b5dfc18..599407c1 100644
--- a/pgp-certificate-store/build.gradle
+++ b/pgp-certificate-store/build.gradle
@@ -17,6 +17,7 @@ dependencies {
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
 
     // Logging
+    api "org.slf4j:slf4j-api:$slf4jVersion"
     testImplementation "ch.qos.logback:logback-classic:$logbackVersion"
 }
 
diff --git a/pgp-certificate-store/src/main/java/pgp/certificate_store/AbstractCertificateStore.java b/pgp-certificate-store/src/main/java/pgp/certificate_store/AbstractCertificateStore.java
new file mode 100644
index 00000000..b95ed5cd
--- /dev/null
+++ b/pgp-certificate-store/src/main/java/pgp/certificate_store/AbstractCertificateStore.java
@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.certificate_store;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import pgp.certificate_store.exception.BadDataException;
+import pgp.certificate_store.exception.BadNameException;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+public abstract class AbstractCertificateStore implements CertificateStore {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractCertificateStore.class);
+
+    public Set<Certificate> getCertificatesBySubkeyId(long subkeyId)
+            throws IOException {
+        Set<String> identifiers = getCertificatesForSubkeyId(subkeyId);
+        if (identifiers.isEmpty()) {
+            return Collections.emptySet();
+        }
+
+        Set<Certificate> certificates = new HashSet<>();
+        for (String identifier : identifiers) {
+            try {
+                certificates.add(getCertificate(identifier));
+            } catch (BadNameException | BadDataException e) {
+                LOGGER.warn("Could not read certificate.", e);
+            }
+        }
+
+        return certificates;
+    }
+}