Lower required Android API to 9 and use Animal Sniffer

.gitignore

@@ -5,3 +5,4 @@ build/
 .DS_Store
 out/
 gradle.properties
+*.iml

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/BuildDecryptionInputStreamAPI.java

@@ -3,9 +3,10 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.security.NoSuchProviderException;
-import java.time.Instant;
+import java.util.Date;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.decrypting.DecryptionStreamFactory;
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.KeySelectionStrategy;
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.Rfc4880KeySelectionStrategy;
@@ -25,8 +26,7 @@ public final class BuildDecryptionInputStreamAPI {
   @Nonnull
   private SignatureValidationStrategy signatureCheckingMode;
 
-  private KeySelectionStrategy keySelectionStrategy = new Rfc4880KeySelectionStrategy(
-      Instant.now());
+  private KeySelectionStrategy keySelectionStrategy = new Rfc4880KeySelectionStrategy(new Date());
 
   /**
    * Start building by passing in the keyring config.
@@ -50,12 +50,11 @@ public final class ValidationWithKeySelectionStrategy extends ValidationImpl {
 
     ValidationWithKeySelectionStrategy() {
       super();
-      BuildDecryptionInputStreamAPI.this.keySelectionStrategy = new Rfc4880KeySelectionStrategy(
-          Instant.now());
+      BuildDecryptionInputStreamAPI.this.keySelectionStrategy = new Rfc4880KeySelectionStrategy(new Date());
     }
 
     public Validation setReferenceDateForKeyValidityTo(
-        Instant dateOfTimestampVerification) {
+        Date dateOfTimestampVerification) {
       if (dateOfTimestampVerification == null) {
         throw new IllegalArgumentException("dateOfTimestampVerification must not be null");
       }

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/BuildEncryptionOutputStreamAPI.java

@@ -5,10 +5,11 @@
 import java.security.NoSuchAlgorithmException;
 import java.security.NoSuchProviderException;
 import java.security.SignatureException;
-import java.time.Instant;
+import java.util.Date;
 import java.util.HashSet;
 import java.util.Set;
 import javax.annotation.Nullable;
+
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.algorithms.DefaultPGPAlgorithmSuites;
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.algorithms.PGPAlgorithmSuite;
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.encrypting.PGPEncryptingStream;
@@ -66,11 +67,11 @@ public final class WithKeySelectionStrategy extends WithAlgorithmSuiteImpl {
     private WithKeySelectionStrategy() {
       super();
       BuildEncryptionOutputStreamAPI.this.keySelectionStrategy = new Rfc4880KeySelectionStrategy(
-          Instant.now());
+          new Date());
     }
 
     public WithAlgorithmSuite setReferenceDateForKeyValidityTo(
-        Instant dateOfTimestampVerification) {
+        Date dateOfTimestampVerification) {
       if (dateOfTimestampVerification == null) {
         throw new IllegalArgumentException("dateOfTimestampVerification must not be null");
       }
@@ -87,7 +88,7 @@ public WithAlgorithmSuite withKeySelectionStrategy(final KeySelectionStrategy st
       }
       BuildEncryptionOutputStreamAPI.this.keySelectionStrategy = strategy;
       LOGGER.trace("WithKeySelectionStrategy: override strategy to {}",
-          strategy.getClass().toGenericString());
+          strategy.getClass().getName());
       return new WithAlgorithmSuiteImpl();
     }
   }

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/keys/callbacks/Rfc4880KeySelectionStrategy.java

@@ -1,14 +1,12 @@
 package name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks;
 
 import java.io.IOException;
-import java.time.Instant;
+import java.util.Date;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
-import java.util.function.Predicate;
-import java.util.stream.Collectors;
-import java.util.stream.StreamSupport;
 import javax.annotation.Nullable;
+
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings.KeyringConfig;
 import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPKeyFlags;
@@ -30,22 +28,22 @@ public class Rfc4880KeySelectionStrategy implements KeySelectionStrategy {
   private static final org.slf4j.Logger LOGGER = org.slf4j.LoggerFactory
       .getLogger(Rfc4880KeySelectionStrategy.class);
 
-  private final Instant dateOfTimestampVerification;
+  private final Date dateOfTimestampVerification;
 
   /**
    * The date used for key expiration date checks as "now".
    *
    * @return dateOfTimestampVerification
    */
-  protected Instant getDateOfTimestampVerification() {
+  protected Date getDateOfTimestampVerification() {
     return dateOfTimestampVerification;
   }
 
 
   /**
    * @param dateOfTimestampVerification The date used for key expiration date checks as "now".
    */
-  public Rfc4880KeySelectionStrategy(final Instant dateOfTimestampVerification) {
+  public Rfc4880KeySelectionStrategy(final Date dateOfTimestampVerification) {
     this.dateOfTimestampVerification = dateOfTimestampVerification;
   }
 
@@ -97,12 +95,17 @@ public Set<PGPPublicKey> validPublicKeysForVerifyingSignatures(String uid,
     final Set<PGPPublicKeyRing> publicKeyrings = this
         .publicKeyRingsForUid(PURPOSE.FOR_SIGNING, uid, keyringConfig);
 
-    return publicKeyrings.stream()
-        .flatMap(keyring -> StreamSupport.stream(keyring.spliterator(), false))
-        .filter(this::isVerificationKey)
-        .filter(this::isNotRevoked)
-        .filter(this::isNotExpired)
-        .collect(Collectors.toSet());
+    Set<PGPPublicKey> validKeys = new HashSet<>();
+    for (PGPPublicKeyRing p : publicKeyrings) {
+      Iterator<PGPPublicKey> keys = p.iterator();
+      while (keys.hasNext()) {
+        PGPPublicKey key = keys.next();
+        if (isVerificationKey(key) && isNotRevoked(key) && isNotExpired(key)) {
+          validKeys.add(key);
+        }
+      }
+    }
+    return validKeys;
   }
 
   @Nullable
@@ -116,52 +119,61 @@ public PGPPublicKey selectPublicKey(PURPOSE purpose, String uid, KeyringConfig k
 
     final PGPSecretKeyRingCollection secretKeyRings = keyringConfig.getSecretKeyRings();
 
+    PGPPublicKey publicKey = null;
     switch (purpose) {
       case FOR_SIGNING:
-        return publicKeyrings.stream()
-            .flatMap(keyring -> StreamSupport.stream(keyring.spliterator(), false))
-            .filter(this::isVerificationKey)
-            .filter(this::isNotRevoked)
-            .filter(this::isNotExpired)
-            .filter(hasPrivateKey(secretKeyRings))
-            .reduce((a, b) -> b)
-            .orElse(null);
+        for (PGPPublicKeyRing ring : publicKeyrings) {
+          Iterator<PGPPublicKey> iterator = ring.iterator();
+          while (iterator.hasNext()) {
+            PGPPublicKey key = iterator.next();
+            if (isVerificationKey(key) &&
+                    isNotRevoked(key) &&
+                    isNotExpired(key) &&
+                    hasPrivateKey(key, secretKeyRings)) {
+              publicKey = key;
+            }
+          }
+        }
+        return publicKey;
 
       case FOR_ENCRYPTION:
-        return publicKeyrings.stream()
-            .flatMap(keyring -> StreamSupport.stream(keyring.spliterator(), false))
-            .filter(this::isEncryptionKey)
-            .filter(this::isNotRevoked)
-            .filter(this::isNotExpired)
-            .reduce((a, b) -> b)
-            .orElse(null);
+        for (PGPPublicKeyRing ring : publicKeyrings) {
+          Iterator<PGPPublicKey> iterator = ring.iterator();
+          while (iterator.hasNext()) {
+            PGPPublicKey key = iterator.next();
+            if (isEncryptionKey(key) &&
+                    isNotRevoked(key) &&
+                    isNotExpired(key)) {
+              publicKey = key;
+            }
+          }
+        }
+        return publicKey;
 
       default:
         return null;
     }
   }
 
+  protected boolean hasPrivateKey(PGPPublicKey pubKey, PGPSecretKeyRingCollection secretKeyRings) {
+    boolean result = false;
+    try {
+      final boolean hasPrivateKey = secretKeyRings.contains(pubKey.getKeyID());
 
-  protected Predicate<PGPPublicKey> hasPrivateKey(final PGPSecretKeyRingCollection secretKeyRings) {
-    return pubKey -> {
-      try {
-        final boolean hasPrivateKey = secretKeyRings.contains(pubKey.getKeyID());
+      if (!hasPrivateKey) {
+        LOGGER.trace("Skipping pubkey {} (no private key found)",
+                Long.toHexString(pubKey.getKeyID()));
+      }
 
-        if (!hasPrivateKey) {
-          LOGGER.trace("Skipping pubkey {} (no private key found)",
-              Long.toHexString(pubKey.getKeyID()));
-        }
+      result = hasPrivateKey;
+    } catch (PGPException e) {
+      // ignore this for filtering
+      LOGGER.debug("Failed to test for private key for pubkey " + pubKey.getKeyID());
+    }
 
-        return hasPrivateKey;
-      } catch (PGPException e) {
-        // ignore this for filtering
-        LOGGER.debug("Failed to test for private key for pubkey " + pubKey.getKeyID());
-        return false;
-      }
-    };
+    return result;
   }
 
-
   protected boolean isNotMasterKey(PGPPublicKey pubKey) {
     return !pubKey.isMasterKey();
   }
@@ -179,10 +191,9 @@ protected boolean isExpired(PGPPublicKey pubKey) {
     final boolean isExpired;
 
     if (hasExpiryDate) {
-      final Instant expiryDate = pubKey.getCreationTime().toInstant()
-          .plusSeconds(pubKey.getValidSeconds());
+      final Date expiryDate = new Date(pubKey.getCreationTime().getTime() + 1000L * pubKey.getValidSeconds());
       isExpired = expiryDate
-          .isBefore(getDateOfTimestampVerification());
+          .before(getDateOfTimestampVerification());
 
       if (isExpired) {
         LOGGER.trace("Skipping pubkey {} (expired since {})",

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/keys/keyrings/FileBasedKeyringConfig.java

@@ -1,10 +1,11 @@
 package name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings;
 
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.file.Files;
 import javax.annotation.Nonnull;
+
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.KeyringConfigCallback;
 
 /**
@@ -27,12 +28,12 @@ public FileBasedKeyringConfig(@Nonnull KeyringConfigCallback callback,
   @Nonnull
   @Override
   protected InputStream getPublicKeyRingStream() throws IOException {
-    return Files.newInputStream(publicKeyring.toPath());
+    return new FileInputStream(publicKeyring);
   }
 
   @Nonnull
   @Override
   protected InputStream getSecretKeyRingStream() throws IOException {
-    return Files.newInputStream(secretKeyring.toPath());
+    return new FileInputStream(secretKeyring);
   }
 }

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/keys/keyrings/InMemoryKeyring.java

@@ -54,13 +54,21 @@ public void addPublicKey(byte[] encodedPublicKey) throws IOException, PGPExcepti
       throw new IllegalArgumentException("encodedPublicKey must not be null");
     }
 
-    try (
-        final InputStream raw = new ByteArrayInputStream(encodedPublicKey);
-        final InputStream decoded = org.bouncycastle.openpgp.PGPUtil.getDecoderStream(raw)
-    ) {
+    InputStream raw = null;
+    InputStream decoded = null;
+    try {
+      raw = new ByteArrayInputStream(encodedPublicKey);
+      decoded = org.bouncycastle.openpgp.PGPUtil.getDecoderStream(raw);
       PGPPublicKeyRing pgpPub = new PGPPublicKeyRing(decoded, getKeyFingerPrintCalculator());
       this.publicKeyRings = PGPPublicKeyRingCollection
-          .addPublicKeyRing(this.publicKeyRings, pgpPub);
+              .addPublicKeyRing(this.publicKeyRings, pgpPub);
+    }
+    catch (IOException e) {
+      if (decoded != null) {
+        decoded.close();
+      }
+      raw.close();
+      throw e;
     }
   }
 
@@ -82,15 +90,22 @@ public void addSecretKey(byte[] encodedPrivateKey) throws IOException, PGPExcept
       throw new IllegalArgumentException("encodedPrivateKey must not be null");
     }
 
-    try (
-        final InputStream raw = new ByteArrayInputStream(encodedPrivateKey);
-        final InputStream decoded = org.bouncycastle.openpgp.PGPUtil
-            .getDecoderStream(raw)
-    ) {
+    InputStream raw = null;
+    InputStream decoded = null;
+    try {
+      raw = new ByteArrayInputStream(encodedPrivateKey);
+      decoded = org.bouncycastle.openpgp.PGPUtil
+              .getDecoderStream(raw);
       PGPSecretKeyRing pgpPRivate = new PGPSecretKeyRing(decoded, getKeyFingerPrintCalculator());
       this.secretKeyRings =
-          PGPSecretKeyRingCollection
-              .addSecretKeyRing(this.secretKeyRings, pgpPRivate);
+              PGPSecretKeyRingCollection
+                      .addSecretKeyRing(this.secretKeyRings, pgpPRivate);
+    } catch (IOException e) {
+      if (decoded != null) {
+        decoded.close();
+      }
+      raw.close();
+      throw e;
     }
   }
 

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/reencryption/ExplodeAndReencrypt.java

@@ -62,11 +62,9 @@ void explodeAndReencrypt(InputStream inputStream)
         numFiles++;
 
         LOGGER.debug("found file '{}'", entry.getName());
-
-        try (
-            final OutputStream outputStream = entityHandlingStrategy
-                .createOutputStream(sanitizedFileName)
-        ) {
+        OutputStream outputStream = null;
+        try {
+          outputStream = entityHandlingStrategy.createOutputStream(sanitizedFileName);
           if (outputStream == null) {
             LOGGER.trace("Ignore {}", entry.getName());
           } else {
@@ -75,6 +73,10 @@ void explodeAndReencrypt(InputStream inputStream)
             encryptedSmallFromZIP.flush();
             encryptedSmallFromZIP.close();
           }
+        } finally {
+          if (outputStream != null) {
+            outputStream.close();
+          }
         }
       }
     }

src/main/java/name/neuhalfen/projects/crypto/bouncycastle/openpgp/validation/SignatureValidationStrategies.java

@@ -6,10 +6,11 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.stream.Collectors;
+
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.KeySelectionStrategy;
 import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings.KeyringConfig;
 import org.bouncycastle.openpgp.PGPException;
@@ -134,8 +135,10 @@ public static SignatureValidationStrategy requireSignatureFromAllUids(
         throw new PGPException("Could not find public-key for userid '" + userId + "'");
       }
 
-      Set<Long> keysForUid = availableKeys.stream().map(key -> key.getKeyID())
-          .collect(Collectors.toSet());
+      Set<Long> keysForUid = new HashSet<>();
+      for (PGPPublicKey p : availableKeys) {
+        keysForUid.add(p.getKeyID());
+      }
 
       keyIdsByUid.put(userId, keysForUid);
     }