diff --git a/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStream.java b/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStream.java
index 566bd26e..42c58252 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStream.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/decryption_verification/DecryptionStream.java
@@ -60,6 +60,21 @@ public class DecryptionStream extends InputStream {
         return r;
     }
 
+    @Override
+    public int read(@Nonnull byte[] bytes, int offset, int length) throws IOException {
+        int read = inputStream.read(bytes, offset, length);
+        if (read != -1) {
+            maybeUpdateDetachedSignatures(bytes, offset, read);
+        }
+        return read;
+    }
+
+    private void maybeUpdateDetachedSignatures(byte[] bytes, int offset, int length) {
+        for (DetachedSignature s : resultBuilder.getDetachedSignatures()) {
+            s.getSignature().update(bytes, offset, length);
+        }
+    }
+
     private void maybeUpdateDetachedSignatures(int rByte) {
         for (DetachedSignature s : resultBuilder.getDetachedSignatures()) {
             if (rByte != -1) {
diff --git a/pgpainless-core/src/main/java/org/pgpainless/util/IntegrityProtectedInputStream.java b/pgpainless-core/src/main/java/org/pgpainless/util/IntegrityProtectedInputStream.java
index eb867505..ee6d3c45 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/util/IntegrityProtectedInputStream.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/util/IntegrityProtectedInputStream.java
@@ -18,6 +18,8 @@ package org.pgpainless.util;
 import java.io.IOException;
 import java.io.InputStream;
 
+import javax.annotation.Nonnull;
+
 import org.bouncycastle.openpgp.PGPEncryptedData;
 import org.bouncycastle.openpgp.PGPException;
 import org.pgpainless.exception.ModificationDetectionException;
@@ -37,6 +39,11 @@ public class IntegrityProtectedInputStream extends InputStream {
         return inputStream.read();
     }
 
+    @Override
+    public int read(@Nonnull byte[] b, int offset, int length) throws IOException {
+        return inputStream.read(b, offset, length);
+    }
+
     @Override
     public void close() throws IOException {
         if (encryptedData.isIntegrityProtected()) {