use buffers for encryption, so large files work as well... also showing encryption progress with better accuracy, which is especially useful for large encryptions

Fixes issue 18.

src/org/thialfihar/android/apg/Apg.java

@@ -1198,6 +1198,7 @@ public class Apg {
     }
 
     public static void encrypt(InputStream inStream, OutputStream outStream,
+                               long dataLength,
                                boolean armored,
                                long encryptionKeyIds[], long signatureKeyId,
                                String signaturePassPhrase,
@@ -1240,23 +1241,13 @@ public class Apg {
             if (signaturePassPhrase == null) {
                 throw new GeneralException("no pass phrase given");
             }
+            progress.setProgress("extracting signature key...", 0, 100);
             signaturePrivateKey = signingKey.extractPrivateKey(signaturePassPhrase.toCharArray(),
                                                                new BouncyCastleProvider());
         }
 
         PGPSignatureGenerator signatureGenerator = null;
-        progress.setProgress("preparing data...", 0, 100);
-
-        ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
-        int n = 0;
-        byte[] buffer = new byte[1 << 16];
-        while ((n = inStream.read(buffer)) > 0) {
-            byteOut.write(buffer, 0, n);
-        }
-        byteOut.close();
-        byte messageData[] = byteOut.toByteArray();
-
-        progress.setProgress("preparing streams...", 20, 100);
+        progress.setProgress("preparing streams...", 5, 100);
         // encryptFile and compress input file content
         PGPEncryptedDataGenerator cPk =
                 new PGPEncryptedDataGenerator(symmetricAlgorithm, true, new SecureRandom(),
@@ -1275,7 +1266,7 @@ public class Apg {
         encryptOut = cPk.open(out, new byte[1 << 16]);
 
         if (signatureKeyId != 0) {
-            progress.setProgress("preparing signature...", 30, 100);
+            progress.setProgress("preparing signature...", 10, 100);
             signatureGenerator =
                     new PGPSignatureGenerator(signingKey.getPublicKey().getAlgorithm(),
                                               hashAlgorithm,
@@ -1298,19 +1289,27 @@ public class Apg {
         PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
         // file name not needed, so empty string
         OutputStream pOut = literalGen.open(bcpgOut, PGPLiteralData.BINARY, "",
-                                            messageData.length, new Date());
+                                            new Date(), new byte[1 << 16]);
 
-        progress.setProgress("encrypting...", 40, 100);
-        pOut.write(messageData);
-
-        if (signatureKeyId != 0) {
-            progress.setProgress("finishing signature...", 70, 100);
-            signatureGenerator.update(messageData);
+        progress.setProgress("encrypting...", 20, 100);
+        long done = 0;
+        int n = 0;
+        byte[] buffer = new byte[1 << 16];
+        while ((n = inStream.read(buffer)) > 0) {
+            pOut.write(buffer, 0, n);
+            if (signatureKeyId != 0) {
+                signatureGenerator.update(buffer, 0, n);
+            }
+            done += n;
+            if (dataLength != 0) {
+                progress.setProgress((int) (20 + (95 - 20) * done / dataLength), 100);
+            }
         }
 
         literalGen.close();
 
         if (signatureKeyId != 0) {
+            progress.setProgress("generating signature...", 95, 100);
             signatureGenerator.generate().encode(pOut);
         }
         compressGen.close();
@@ -1516,7 +1515,7 @@ public class Apg {
                 throw new GeneralException("couldn't find a packet with symmetric encryption");
             }
 
-            progress.setProgress("decrypting data...", 20, 100);
+            progress.setProgress("preparing streams...", 20, 100);
             clear = pbe.getDataStream(passPhrase.toCharArray(), new BouncyCastleProvider());
             encryptedData = pbe;
         } else {
@@ -1550,7 +1549,7 @@ public class Apg {
                 throw new PGPException("wrong pass phrase");
             }
 
-            progress.setProgress("decrypting data...", 30, 100);
+            progress.setProgress("preparing streams...", 30, 100);
             clear = pbe.getDataStream(privateKey, new BouncyCastleProvider());
             encryptedData = pbe;
         }
@@ -1606,9 +1605,9 @@ public class Apg {
         }
 
         if (dataChunk instanceof PGPLiteralData) {
-            progress.setProgress("unpacking data...", 70, 100);
+            progress.setProgress("decrypting data...", 70, 100);
             PGPLiteralData literalData = (PGPLiteralData) dataChunk;
-            BufferedOutputStream out = new BufferedOutputStream(outStream);
+            OutputStream out = outStream;
 
             byte[] buffer = new byte[1 << 16];
             InputStream dataIn = literalData.getInputStream();

src/org/thialfihar/android/apg/DecryptFileActivity.java

@@ -183,14 +183,9 @@ public class DecryptFileActivity extends BaseActivity {
 
         try {
             InputStream in = new FileInputStream(mInputFilename);
-            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            OutputStream out = new FileOutputStream(mOutputFilename);
 
             data = Apg.decrypt(in, out, Apg.getPassPhrase(), this, mAssumeSymmetricEncryption);
-
-            out.close();
-            OutputStream fileOut = new FileOutputStream(mOutputFilename);
-            fileOut.write(out.toByteArray());
-            fileOut.close();
         } catch (PGPException e) {
             error = e.getMessage();
         } catch (IOException e) {

src/org/thialfihar/android/apg/EncryptFileActivity.java

@@ -333,7 +333,7 @@ public class EncryptFileActivity extends BaseActivity {
             }
 
             InputStream in = new FileInputStream(mInputFilename);
-            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            OutputStream out = new FileOutputStream(mOutputFilename);
 
             String passPhrase = null;
             if (mEncryptionMode.getCheckedRadioButtonId() == R.id.use_symmetric) {
@@ -342,17 +342,18 @@ public class EncryptFileActivity extends BaseActivity {
                     passPhrase = null;
                 }
             }
-            Apg.encrypt(in, out, mAsciiArmour.isChecked(),
-                                 mEncryptionKeyIds, getSecretKeyId(),
-                                 Apg.getPassPhrase(), this,
-                                 ((Choice) mAlgorithm.getSelectedItem()).getId(),
-                                 getDefaultHashAlgorithm(),
-                                 passPhrase);
+
+            File file = new File(mInputFilename);
+            long fileSize = file.length();
+
+            Apg.encrypt(in, out, fileSize, mAsciiArmour.isChecked(),
+                        mEncryptionKeyIds, getSecretKeyId(),
+                        Apg.getPassPhrase(), this,
+                        ((Choice) mAlgorithm.getSelectedItem()).getId(),
+                        getDefaultHashAlgorithm(),
+                        passPhrase);
 
             out.close();
-            OutputStream fileOut = new FileOutputStream(mOutputFilename);
-            fileOut.write(out.toByteArray());
-            fileOut.close();
         } catch (FileNotFoundException e) {
             error = "file not found: " + e.getMessage();
         }

src/org/thialfihar/android/apg/EncryptMessageActivity.java

@@ -193,12 +193,12 @@ public class EncryptMessageActivity extends BaseActivity {
                 message = message.replaceFirst("\n*$", "\n");
             }
 
-            ByteArrayInputStream in =
-                new ByteArrayInputStream(Strings.toUTF8ByteArray(message));
+            byte[] byteData = Strings.toUTF8ByteArray(message);
+            ByteArrayInputStream in = new ByteArrayInputStream(byteData);
             ByteArrayOutputStream out = new ByteArrayOutputStream();
 
             if (encryptIt) {
-                Apg.encrypt(in, out, true, mEncryptionKeyIds, getSecretKeyId(),
+                Apg.encrypt(in, out, byteData.length, true, mEncryptionKeyIds, getSecretKeyId(),
                             Apg.getPassPhrase(), this,
                             getDefaultEncryptionAlgorithm(), getDefaultHashAlgorithm(),
                             null);

src/org/thialfihar/android/apg/MainActivity.java

@@ -221,6 +221,9 @@ public class MainActivity extends BaseActivity {
                 SpannableString info =
                         new SpannableString("Read the warnings!\n\n" +
                                             "Changes:\n" +
+                                            "* fixed several crashes\n" +
+                                            "* can encrypt large files\n" +
+                                            "* better progress bar calculation\n" +
                                             "\n" +
                                             "WARNING: be careful editing your existing keys, as they " +
                                             "WILL be stripped of certificates right now.\n" +