diff --git a/pgpainless-core/src/main/kotlin/org/bouncycastle/extensions/PGPSignatureExtensions.kt b/pgpainless-core/src/main/kotlin/org/bouncycastle/extensions/PGPSignatureExtensions.kt
new file mode 100644
index 00000000..657abba9
--- /dev/null
+++ b/pgpainless-core/src/main/kotlin/org/bouncycastle/extensions/PGPSignatureExtensions.kt
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.bouncycastle.extensions
+
+import org.bouncycastle.openpgp.PGPSignature
+import org.pgpainless.key.OpenPgpFingerprint
+import org.pgpainless.signature.SignatureUtils
+import java.util.*
+
+fun PGPSignature.getKeyExpirationDate(keyCreationDate: Date): Date? =
+        SignatureUtils.getKeyExpirationDate(keyCreationDate, this)
+
+fun PGPSignature.getSignatureExpirationDate(): Date? =
+        SignatureUtils.getSignatureExpirationDate(this)
+
+fun PGPSignature.isExpired(referenceTime: Date = Date()) =
+        SignatureUtils.isSignatureExpired(this, referenceTime)
+
+fun PGPSignature.getIssuerKeyId() = SignatureUtils.determineIssuerKeyId(this)
+
+fun PGPSignature.wasIssuedBy(fingerprint: OpenPgpFingerprint) = SignatureUtils.wasIssuedBy(fingerprint, this)