Add debug output and change API

src/main/java/de/vanitasvitae/crypto/pgpainless/algorithm/SymmetricKeyAlgorithm.java

@@ -46,7 +46,7 @@ public enum SymmetricKeyAlgorithm {
         }
     }
 
-    public static SymmetricKeyAlgorithm forId(int id) {
+    public static SymmetricKeyAlgorithm fromId(int id) {
         return MAP.get(id);
     }
 

src/main/java/de/vanitasvitae/crypto/pgpainless/decryption_verification/DecryptionBuilder.java

@@ -33,7 +33,6 @@ public class DecryptionBuilder implements DecryptionBuilderInterface {
     private PGPSecretKeyRingCollection decryptionKeys;
     private SecretKeyRingProtector decryptionKeyDecryptor;
     private Set<PGPPublicKeyRing> verificationKeys = new HashSet<>();
-    private Set<Long> trustedKeyIds = new HashSet<>();
     private MissingPublicKeyCallback missingPublicKeyCallback = null;
 
     @Override
@@ -66,22 +65,23 @@ public class DecryptionBuilder implements DecryptionBuilderInterface {
                                                    PGPPublicKeyRingCollection publicKeyRingCollection) {
             Set<PGPPublicKeyRing> publicKeyRings = new HashSet<>();
             for (Iterator<PGPPublicKeyRing> i = publicKeyRingCollection.getKeyRings(); i.hasNext(); ) {
-                publicKeyRings.add(i.next());
+                PGPPublicKeyRing p = i.next();
+                if (trustedKeyIds.contains(p.getPublicKey().getKeyID())) {
+                    publicKeyRings.add(p);
                 }
-            return verifyWith(trustedKeyIds, publicKeyRings);
+            }
+            return verifyWith(publicKeyRings);
         }
 
         @Override
-        public MissingPublicKeyFeedback verifyWith(Set<Long> trustedKeyIds, Set<PGPPublicKeyRing> publicKeyRings) {
+        public MissingPublicKeyFeedback verifyWith(Set<PGPPublicKeyRing> publicKeyRings) {
             DecryptionBuilder.this.verificationKeys = publicKeyRings;
-            DecryptionBuilder.this.trustedKeyIds = trustedKeyIds;
             return new MissingPublicKeyFeedbackImpl();
         }
 
         @Override
         public Build doNotVerify() {
             DecryptionBuilder.this.verificationKeys = null;
-            DecryptionBuilder.this.trustedKeyIds = null;
             return new BuildImpl();
         }
     }
@@ -105,7 +105,7 @@ public class DecryptionBuilder implements DecryptionBuilderInterface {
         @Override
         public DecryptionStream build() throws IOException, PGPException {
             return DecryptionStreamFactory.create(inputStream,
-                    decryptionKeys, decryptionKeyDecryptor, verificationKeys, trustedKeyIds, missingPublicKeyCallback);
+                    decryptionKeys, decryptionKeyDecryptor, verificationKeys, missingPublicKeyCallback);
         }
     }
 }

src/main/java/de/vanitasvitae/crypto/pgpainless/decryption_verification/DecryptionBuilderInterface.java

@@ -41,7 +41,7 @@ public interface DecryptionBuilderInterface {
 
         MissingPublicKeyFeedback verifyWith(Set<Long> trustedFingerprints, PGPPublicKeyRingCollection publicKeyRings);
 
-        MissingPublicKeyFeedback verifyWith(Set<Long> trustedFingerprints, Set<PGPPublicKeyRing> publicKeyRings);
+        MissingPublicKeyFeedback verifyWith(Set<PGPPublicKeyRing> publicKeyRings);
 
         Build doNotVerify();
 

src/main/java/de/vanitasvitae/crypto/pgpainless/decryption_verification/DecryptionStreamFactory.java

@@ -23,8 +23,10 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
-import de.vanitasvitae.crypto.pgpainless.PainlessStream;
 import de.vanitasvitae.crypto.pgpainless.algorithm.CompressionAlgorithm;
 import de.vanitasvitae.crypto.pgpainless.algorithm.SymmetricKeyAlgorithm;
 import de.vanitasvitae.crypto.pgpainless.key.SecretKeyRingProtector;
@@ -51,10 +53,12 @@ import org.bouncycastle.openpgp.operator.bc.BcPublicKeyDataDecryptorFactory;
 
 public class DecryptionStreamFactory {
 
+    private static final Logger LOGGER = Logger.getLogger(DecryptionStreamFactory.class.getName());
+    private static final Level LEVEL = Level.INFO;
+
     private final PGPSecretKeyRingCollection decryptionKeys;
     private final SecretKeyRingProtector decryptionKeyDecryptor;
     private final Set<PGPPublicKeyRing> verificationKeys = new HashSet<>();
-    private final Set<Long> trustedKeyIds = new HashSet<>();
     private final MissingPublicKeyCallback missingPublicKeyCallback;
 
     private final PainlessResult.Builder resultBuilder = PainlessResult.getBuilder();
@@ -65,12 +69,10 @@ public class DecryptionStreamFactory {
     private DecryptionStreamFactory(PGPSecretKeyRingCollection decryptionKeys,
                                     SecretKeyRingProtector decryptor,
                                     Set<PGPPublicKeyRing> verificationKeys,
-                                    Set<Long> trustedKeyIds,
                                     MissingPublicKeyCallback missingPublicKeyCallback) {
         this.decryptionKeys = decryptionKeys;
         this.decryptionKeyDecryptor = decryptor;
         this.verificationKeys.addAll(verificationKeys != null ? verificationKeys : Collections.emptyList());
-        this.trustedKeyIds.addAll(trustedKeyIds != null ? trustedKeyIds : Collections.emptyList());
         this.missingPublicKeyCallback = missingPublicKeyCallback;
     }
 
@@ -78,14 +80,12 @@ public class DecryptionStreamFactory {
                                           PGPSecretKeyRingCollection decryptionKeys,
                                           SecretKeyRingProtector decryptor,
                                           Set<PGPPublicKeyRing> verificationKeys,
-                                          Set<Long> trustedKeyIds,
                                           MissingPublicKeyCallback missingPublicKeyCallback)
             throws IOException, PGPException {
 
         DecryptionStreamFactory factory =  new DecryptionStreamFactory(decryptionKeys,
                 decryptor,
                 verificationKeys,
-                trustedKeyIds,
                 missingPublicKeyCallback);
 
         PGPObjectFactory objectFactory = new PGPObjectFactory(
@@ -100,6 +100,7 @@ public class DecryptionStreamFactory {
         while ((pgpObj = objectFactory.nextObject()) != null) {
 
             if (pgpObj instanceof PGPEncryptedDataList) {
+                LOGGER.log(LEVEL, "Encountered PGPEncryptedDataList");
                 PGPEncryptedDataList encDataList = (PGPEncryptedDataList) pgpObj;
                 InputStream nextStream = decrypt(encDataList);
                 objectFactory = new PGPObjectFactory(PGPUtil.getDecoderStream(nextStream), fingerCalc);
@@ -111,20 +112,25 @@ public class DecryptionStreamFactory {
                 InputStream nextStream = compressedData.getDataStream();
                 resultBuilder.setCompressionAlgorithm(CompressionAlgorithm.fromId(compressedData.getAlgorithm()));
                 objectFactory = new PGPObjectFactory(PGPUtil.getDecoderStream(nextStream), fingerCalc);
+                LOGGER.log(LEVEL, "Encountered PGPCompressedData: " +
+                        CompressionAlgorithm.fromId(compressedData.getAlgorithm()));
                 return wrap(objectFactory);
             }
 
             if (pgpObj instanceof PGPOnePassSignatureList) {
                 PGPOnePassSignatureList onePassSignatures = (PGPOnePassSignatureList) pgpObj;
+                LOGGER.log(LEVEL, "Encountered PGPOnePassSignatureList of size " + onePassSignatures.size());
                 initOnePassSignatures(onePassSignatures);
                 return wrap(objectFactory);
             }
 
             if (pgpObj instanceof PGPLiteralData) {
+                LOGGER.log(LEVEL, "Encountered PGPLiteralData");
                 PGPLiteralData literalData = (PGPLiteralData) pgpObj;
                 InputStream literalDataInputStream = literalData.getInputStream();
 
                 if (verifiableOnePassSignatures.isEmpty()) {
+                    LOGGER.log(LEVEL, "No OnePassSignatures found -> We are done");
                     return literalDataInputStream;
                 }
 
@@ -133,14 +139,14 @@ public class DecryptionStreamFactory {
             }
         }
 
-        throw new PGPException("No Literal Data Packet found!");
+        throw new PGPException("No Literal Data Packet found");
     }
 
     private InputStream decrypt(PGPEncryptedDataList encryptedDataList)
             throws PGPException {
         Iterator<?> iterator = encryptedDataList.getEncryptedDataObjects();
         if (!iterator.hasNext()) {
-            throw new PGPException("Decryption failed - No encrypted data found!");
+            throw new PGPException("Decryption failed - EncryptedDataList has no items");
         }
 
         PGPPrivateKey decryptionKey = null;
@@ -150,27 +156,37 @@ public class DecryptionStreamFactory {
             long keyId = encryptedSessionKey.getKeyID();
 
             resultBuilder.addRecipientKeyId(keyId);
-
+            LOGGER.log(LEVEL, "PGPEncryptedData is encrypted for key " + Long.toHexString(keyId));
             if (decryptionKey != null) {
                 continue;
             }
 
             PGPSecretKey secretKey = decryptionKeys.getSecretKey(keyId);
             if (secretKey != null) {
+                LOGGER.log(LEVEL, "Found respective secret key " + Long.toHexString(keyId));
                 decryptionKey = secretKey.extractPrivateKey(decryptionKeyDecryptor.getDecryptor(keyId));
                 resultBuilder.setDecryptionKeyId(keyId);
             }
         }
 
         if (decryptionKey == null) {
-            throw new PGPException("Decryption failed - No suitable decryption key found!");
+            throw new PGPException("Decryption failed - No suitable decryption key found");
         }
 
         PublicKeyDataDecryptorFactory keyDecryptor = new BcPublicKeyDataDecryptorFactory(decryptionKey);
-        resultBuilder.setSymmetricKeyAlgorithm(
+        SymmetricKeyAlgorithm symmetricKeyAlgorithm = SymmetricKeyAlgorithm
-                SymmetricKeyAlgorithm.forId(encryptedSessionKey.getSymmetricAlgorithm(keyDecryptor)));
+                .fromId(encryptedSessionKey.getSymmetricAlgorithm(keyDecryptor));
-        resultBuilder.setIntegrityProtected(encryptedSessionKey.isIntegrityProtected());
 
+        LOGGER.log(LEVEL, "Message is encrypted using " + symmetricKeyAlgorithm);
+        resultBuilder.setSymmetricKeyAlgorithm(symmetricKeyAlgorithm);
+
+        if (encryptedSessionKey.isIntegrityProtected()) {
+            LOGGER.log(LEVEL, "Message is integrity protected");
+            resultBuilder.setIntegrityProtected(true);
+        } else {
+            LOGGER.log(LEVEL, "Message is not integrity protected");
+            resultBuilder.setIntegrityProtected(false);
+        }
         InputStream decryptionStream = encryptedSessionKey.getDataStream(keyDecryptor);
 
         return decryptionStream;
@@ -179,7 +195,7 @@ public class DecryptionStreamFactory {
     private void initOnePassSignatures(PGPOnePassSignatureList onePassSignatureList) throws PGPException {
         Iterator<PGPOnePassSignature> iterator = onePassSignatureList.iterator();
         if (!iterator.hasNext()) {
-            throw new PGPException("Verification failed - No OnePassSignatures found!");
+            throw new PGPException("Verification failed - No OnePassSignatures found");
         }
 
         while (iterator.hasNext()) {
@@ -187,10 +203,16 @@ public class DecryptionStreamFactory {
             long keyId = signature.getKeyID();
             resultBuilder.addSignatureKeyId(keyId);
 
+            LOGGER.log(LEVEL, "Message contains OnePassSignature from " + Long.toHexString(keyId));
+
             // Find public key
             PGPPublicKey verificationKey = null;
             for (PGPPublicKeyRing publicKeyRing : verificationKeys) {
-                verificationKey = publicKeyRing.getPublicKey(signature.getKeyID());
+                verificationKey = publicKeyRing.getPublicKey(keyId);
+                if (verificationKey != null) {
+                    LOGGER.log(LEVEL, "Found respective public key " + Long.toHexString(keyId));
+                    break;
+                }
             }
 
             if (verificationKey != null) {

src/main/java/de/vanitasvitae/crypto/pgpainless/decryption_verification/SignatureVerifyingInputStream.java

@@ -20,6 +20,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.security.SignatureException;
 import java.util.Map;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Handler;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -32,11 +34,14 @@ import org.bouncycastle.openpgp.PGPSignatureList;
 public class SignatureVerifyingInputStream extends FilterInputStream {
 
     private static final Logger LOGGER = Logger.getLogger(SignatureVerifyingInputStream.class.getName());
+    private static final Level LEVEL = Level.INFO;
 
     private final PGPObjectFactory objectFactory;
     private final Map<Long, PGPOnePassSignature> onePassSignatures;
     private final PainlessResult.Builder resultBuilder;
 
+    private boolean validated = false;
+
     protected SignatureVerifyingInputStream(InputStream inputStream,
                                             PGPObjectFactory objectFactory,
                                             Map<Long, PGPOnePassSignature> onePassSignatures,
@@ -45,6 +50,8 @@ public class SignatureVerifyingInputStream extends FilterInputStream {
         this.objectFactory = objectFactory;
         this.resultBuilder = resultBuilder;
         this.onePassSignatures = onePassSignatures;
+
+        LOGGER.log(LEVEL, "Begin verifying OnePassSignatures");
     }
 
     private void updateOnePassSignatures(byte data) {
@@ -60,8 +67,16 @@ public class SignatureVerifyingInputStream extends FilterInputStream {
     }
 
     private void validateOnePassSignatures() throws IOException {
+
+        if (validated) {
+            LOGGER.log(LEVEL, "Validated signatures already. Skip");
+            return;
+        }
+
+        validated = true;
+
         if (onePassSignatures.isEmpty()) {
-            LOGGER.log(Level.FINE, "No One-Pass-Signatures found -> No validation.");
+            LOGGER.log(LEVEL, "No One-Pass-Signatures found -> No validation");
             return;
         }
 
@@ -77,19 +92,20 @@ public class SignatureVerifyingInputStream extends FilterInputStream {
             }
 
             if (signatureList == null || signatureList.isEmpty()) {
-                throw new IOException("Verification failed - No Signatures found!");
+                throw new IOException("Verification failed - No Signatures found");
             }
 
             for (PGPSignature signature : signatureList) {
                 PGPOnePassSignature onePassSignature = onePassSignatures.get(signature.getKeyID());
                 if (onePassSignature == null) {
+                    LOGGER.log(LEVEL, "Found Signature without respective OnePassSignature packet -> skip");
                     continue;
                 }
                 if (!onePassSignature.verify(signature)) {
                     throw new SignatureException("Bad Signature of key " + signature.getKeyID());
                 } else {
+                    LOGGER.log(LEVEL, "Verified signature of key " + Long.toHexString(signature.getKeyID()));
                     resultBuilder.addVerifiedSignatureKeyId(signature.getKeyID());
-                    onePassSignatures.remove(signature.getKeyID());
                 }
             }
         } catch (PGPException | SignatureException e) {
@@ -130,17 +146,17 @@ public class SignatureVerifyingInputStream extends FilterInputStream {
 
     @Override
     public long skip(long n) {
-        throw new UnsupportedOperationException("skip() is not supported.");
+        throw new UnsupportedOperationException("skip() is not supported");
     }
 
     @Override
     public synchronized void mark(int readlimit) {
-        throw new UnsupportedOperationException("mark() not supported.");
+        throw new UnsupportedOperationException("mark() not supported");
     }
 
     @Override
     public synchronized void reset() {
-        throw new UnsupportedOperationException("reset() is not supported.");
+        throw new UnsupportedOperationException("reset() is not supported");
     }
 
     @Override