SOP: Unify key/certificate reading code

pgpainless-sop/src/main/java/org/pgpainless/sop/DecryptImpl.java

@@ -52,22 +52,9 @@ public class DecryptImpl implements Decrypt {
 
     @Override
     public DecryptImpl verifyWithCert(InputStream certIn) throws SOPGPException.BadData, IOException {
-        try {
+        PGPPublicKeyRingCollection certs = KeyReader.readPublicKeys(certIn, true);
-            PGPPublicKeyRingCollection certs = PGPainless.readKeyRing().keyRingCollection(certIn, false)
+        if (certs != null) {
-                    .getPgpPublicKeyRingCollection();
-            if (certs.size() == 0) {
-                throw new SOPGPException.BadData(new PGPException("No certificates provided."));
-            }
-
             consumerOptions.addVerificationCerts(certs);
-
-        } catch (IOException e) {
-            if (e.getMessage() != null && e.getMessage().startsWith("unknown object in stream:")) {
-                throw new SOPGPException.BadData(e);
-            }
-            throw e;
-        } catch (PGPException e) {
-            throw new SOPGPException.BadData(e);
         }
         return this;
     }
@@ -102,24 +89,12 @@ public class DecryptImpl implements Decrypt {
 
     @Override
     public DecryptImpl withKey(InputStream keyIn) throws SOPGPException.BadData, IOException, SOPGPException.UnsupportedAsymmetricAlgo {
-        try {
+        PGPSecretKeyRingCollection secretKeyCollection = KeyReader.readSecretKeys(keyIn, true);
-            PGPSecretKeyRingCollection secretKeyCollection = PGPainless.readKeyRing()
+
-                    .secretKeyRingCollection(keyIn);
-            if (secretKeyCollection.size() == 0) {
-                throw new SOPGPException.BadData("No key data found.");
-            }
         for (PGPSecretKeyRing key : secretKeyCollection) {
             protector.addSecretKey(key);
             consumerOptions.addDecryptionKey(key, protector);
         }
-        } catch (IOException e) {
-            if (e.getMessage() != null && e.getMessage().startsWith("unknown object in stream:")) {
-                throw new SOPGPException.BadData(e);
-            }
-            throw e;
-        } catch (PGPException e) {
-            throw new SOPGPException.BadData(e);
-        }
         return this;
     }
 

pgpainless-sop/src/main/java/org/pgpainless/sop/DetachedVerifyImpl.java

@@ -39,13 +39,8 @@ public class DetachedVerifyImpl implements DetachedVerify {
     }
 
     @Override
-    public DetachedVerify cert(InputStream cert) throws SOPGPException.BadData {
+    public DetachedVerify cert(InputStream cert) throws SOPGPException.BadData, IOException {
-        PGPPublicKeyRingCollection certificates;
+        PGPPublicKeyRingCollection certificates = KeyReader.readPublicKeys(cert, true);
-        try {
-            certificates = PGPainless.readKeyRing().publicKeyRingCollection(cert);
-        } catch (IOException | PGPException e) {
-            throw new SOPGPException.BadData(e);
-        }
         options.addVerificationCerts(certificates);
         return this;
     }

pgpainless-sop/src/main/java/org/pgpainless/sop/EncryptImpl.java

@@ -58,13 +58,11 @@ public class EncryptImpl implements Encrypt {
 
     @Override
     public Encrypt signWith(InputStream keyIn)
-            throws SOPGPException.KeyCannotSign, SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.BadData {
+            throws SOPGPException.KeyCannotSign, SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.BadData, IOException {
         if (signingOptions == null) {
             signingOptions = SigningOptions.get();
         }
-
+        PGPSecretKeyRingCollection keys = KeyReader.readSecretKeys(keyIn, true);
-        try {
-            PGPSecretKeyRingCollection keys = PGPainless.readKeyRing().secretKeyRingCollection(keyIn);
         if (keys.size() != 1) {
             throw new SOPGPException.BadData(new AssertionError("Exactly one secret key at a time expected. Got " + keys.size()));
         }
@@ -77,9 +75,6 @@ public class EncryptImpl implements Encrypt {
 
         protector.addSecretKey(signingKey);
         signingKeys.add(signingKey);
-        } catch (IOException | PGPException e) {
-            throw new SOPGPException.BadData(e);
-        }
         return this;
     }
 

pgpainless-sop/src/main/java/org/pgpainless/sop/ExtractCertImpl.java

@@ -10,7 +10,6 @@ import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 
-import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPPublicKeyRing;
 import org.bouncycastle.openpgp.PGPSecretKeyRing;
 import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
@@ -32,21 +31,7 @@ public class ExtractCertImpl implements ExtractCert {
 
     @Override
     public Ready key(InputStream keyInputStream) throws IOException, SOPGPException.BadData {
-        PGPSecretKeyRingCollection keys;
+        PGPSecretKeyRingCollection keys = KeyReader.readSecretKeys(keyInputStream, true);
-        try {
-            keys = PGPainless.readKeyRing().secretKeyRingCollection(keyInputStream);
-        } catch (IOException e) {
-            if (e.getMessage() != null && e.getMessage().startsWith("unknown object in stream:")) {
-                throw new SOPGPException.BadData(e);
-            }
-            throw e;
-        } catch (PGPException e) {
-            throw new IOException("Cannot read keys.", e);
-        }
-
-        if (keys == null || keys.size() == 0) {
-            throw new SOPGPException.BadData(new PGPException("No key data found."));
-        }
 
         List<PGPPublicKeyRing> certs = new ArrayList<>();
         for (PGPSecretKeyRing key : keys) {

pgpainless-sop/src/main/java/org/pgpainless/sop/InlineSignImpl.java

@@ -51,9 +51,7 @@ public class InlineSignImpl implements InlineSign {
 
     @Override
     public InlineSign key(InputStream keyIn) throws SOPGPException.KeyCannotSign, SOPGPException.BadData, IOException {
-        try {
+        PGPSecretKeyRingCollection keys = KeyReader.readSecretKeys(keyIn, true);
-            PGPSecretKeyRingCollection keys = PGPainless.readKeyRing().secretKeyRingCollection(keyIn);
-
         for (PGPSecretKeyRing key : keys) {
             KeyRingInfo info = PGPainless.inspectKeyRing(key);
             if (!info.isUsableForSigning()) {
@@ -62,9 +60,6 @@ public class InlineSignImpl implements InlineSign {
             protector.addSecretKey(key);
             signingKeys.add(key);
         }
-        } catch (PGPException | KeyException e) {
-            throw new SOPGPException.BadData(e);
-        }
         return this;
     }
 

pgpainless-sop/src/main/java/org/pgpainless/sop/InlineVerifyImpl.java

@@ -42,13 +42,8 @@ public class InlineVerifyImpl implements InlineVerify {
     }
 
     @Override
-    public InlineVerify cert(InputStream cert) throws SOPGPException.BadData {
+    public InlineVerify cert(InputStream cert) throws SOPGPException.BadData, IOException {
-        PGPPublicKeyRingCollection certificates;
+        PGPPublicKeyRingCollection certificates = KeyReader.readPublicKeys(cert, true);
-        try {
-            certificates = PGPainless.readKeyRing().publicKeyRingCollection(cert);
-        } catch (IOException | PGPException e) {
-            throw new SOPGPException.BadData(e);
-        }
         options.addVerificationCerts(certificates);
         return this;
     }

pgpainless-sop/src/main/java/org/pgpainless/sop/KeyReader.java

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.sop;
+
+import org.bouncycastle.openpgp.PGPException;
+import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
+import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
+import org.pgpainless.PGPainless;
+import sop.exception.SOPGPException;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+class KeyReader {
+
+    static PGPSecretKeyRingCollection readSecretKeys(InputStream keyInputStream, boolean requireContent)
+            throws IOException, SOPGPException.BadData {
+        PGPSecretKeyRingCollection keys;
+        try {
+            keys = PGPainless.readKeyRing().secretKeyRingCollection(keyInputStream);
+        } catch (IOException e) {
+            String message = e.getMessage();
+            if (message == null) {
+                throw e;
+            }
+            if (message.startsWith("unknown object in stream:") ||
+                    message.startsWith("invalid header encountered")) {
+                throw new SOPGPException.BadData(e);
+            }
+            throw e;
+        } catch (PGPException e) {
+            throw new IOException("Cannot read keys.", e);
+        }
+
+        if (requireContent && (keys == null || keys.size() == 0)) {
+            throw new SOPGPException.BadData(new PGPException("No key data found."));
+        }
+
+        return keys;
+    }
+
+    static PGPPublicKeyRingCollection readPublicKeys(InputStream certIn, boolean requireContent) throws IOException {
+        PGPPublicKeyRingCollection certs;
+        try {
+            certs = PGPainless.readKeyRing().publicKeyRingCollection(certIn);
+        } catch (IOException e) {
+            if (e.getMessage() != null && e.getMessage().startsWith("unknown object in stream:")) {
+                throw new SOPGPException.BadData(e);
+            }
+            throw e;
+        } catch (PGPException e) {
+            throw new SOPGPException.BadData(e);
+        }
+        if (requireContent && (certs == null || certs.size() == 0)) {
+            throw new SOPGPException.BadData(new PGPException("No cert data found."));
+        }
+        return certs;
+    }
+}