From 2535ecb91f99ef5db2cd373a28eddaf99d2c02a4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= <dominik@dominikschuermann.de>
Date: Tue, 29 Sep 2015 14:38:30 +0200
Subject: Full 160 bit for phrase confirm, stuffed with ones

---
 .../keychain/experimental/BitInputStream.java          | 17 +++++++++++------
 .../keychain/experimental/SentenceConfirm.java         | 18 +++++++++++-------
 2 files changed, 22 insertions(+), 13 deletions(-)

(limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental')

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/BitInputStream.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/BitInputStream.java
index b6ec7234e..111e0b366 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/BitInputStream.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/BitInputStream.java
@@ -26,7 +26,7 @@ import java.io.InputStream;
  * general Java InputStream.
  * Like the various Stream-classes from Java, the BitInputStream
  * has to be created based on another Input stream. It provides
- * a function to read the next bit from the sream, as well as to read multiple
+ * a function to read the next bit from the stream, as well as to read multiple
  * bits at once and write the resulting data into an integer value.
  * <p/>
  * source: http://developer.nokia.com/Community/Wiki/Bit_Input/Output_Stream_utility_classes_for_efficient_data_transfer
@@ -69,11 +69,11 @@ public class BitInputStream {
      * @return integer value containing the bits read from the stream.
      * @throws IOException
      */
-    synchronized public int readBits(final int aNumberOfBits)
+    synchronized public int readBits(final int aNumberOfBits, boolean stuffIfEnd)
             throws IOException {
         int value = 0;
         for (int i = aNumberOfBits - 1; i >= 0; i--) {
-            value |= (readBit() << i);
+            value |= (readBit(stuffIfEnd) << i);
         }
         return value;
     }
@@ -92,15 +92,20 @@ public class BitInputStream {
      * @return 0 if the bit is 0, 1 if the bit is 1.
      * @throws IOException
      */
-    synchronized public int readBit() throws IOException {
+    synchronized public int readBit(boolean stuffIfEnd) throws IOException {
         if (iIs == null)
             throw new IOException("Already closed");
 
         if (iNextBit == 8) {
             iBuffer = iIs.read();
 
-            if (iBuffer == -1)
-                throw new EOFException();
+            if (iBuffer == -1) {
+                if (stuffIfEnd) {
+                    return 1;
+                } else {
+                    throw new EOFException();
+                }
+            }
 
             iNextBit = 0;
         }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/SentenceConfirm.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/SentenceConfirm.java
index ead70b8f6..0374d878c 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/SentenceConfirm.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/experimental/SentenceConfirm.java
@@ -99,8 +99,12 @@ public class SentenceConfirm {
      */
     private EntropyString getWord(List<String> words, BitInputStream bin) throws IOException {
         final int neededBits = log(words.size(), 2);
-        Log.d(Constants.TAG, "need " + neededBits + " bits of entropy");
-        int bits = bin.readBits(neededBits);
+        Log.d(Constants.TAG, "need: " + neededBits + " bits of entropy");
+        Log.d(Constants.TAG, "available: " + bin.available() + " bits");
+        if (neededBits > bin.available()) {
+            Log.d(Constants.TAG, "stuffed with " + (neededBits - bin.available()) + " ones!");
+        }
+        int bits = bin.readBits(neededBits, true);
         Log.d(Constants.TAG, "got word " + words.get(bits) + " with " + neededBits + " bits of entropy");
         return new EntropyString(words.get(bits), neededBits);
     }
@@ -108,7 +112,7 @@ public class SentenceConfirm {
     private EntropyString getNounPhrase(BitInputStream bits) throws IOException {
         final EntropyString phrase = new EntropyString();
         phrase.append(getWord(art, bits)).append(" ");
-        if (bits.readBit() != 0) {
+        if (bits.readBit(true) != 0) {
             phrase.append(getWord(adj, bits)).append(" ");
         }
         phrase.incBits();
@@ -121,7 +125,7 @@ public class SentenceConfirm {
     EntropyString getSentence(BitInputStream bits) throws IOException {
         final EntropyString sentence = new EntropyString();
         sentence.append(getNounPhrase(bits));   // Subject
-        if (bits.readBit() != 0) {
+        if (bits.readBit(true) != 0) {
             sentence.append(" ").append(getWord(vt, bits));   // Transitive verb
             sentence.append(" ").append(getNounPhrase(bits)); // Object of transitive verb
         } else {
@@ -129,17 +133,17 @@ public class SentenceConfirm {
         }
         sentence.incBits();
 
-        if (bits.readBit() != 0) {
+        if (bits.readBit(true) != 0) {
             sentence.append(" ").append(getWord(adv, bits)); // Adverb
         }
 
         sentence.incBits();
-        if (bits.readBit() != 0) {
+        if (bits.readBit(true) != 0) {
             sentence.append(" ").append(getWord(p, bits));    // Preposition
             sentence.append(" ").append(getNounPhrase(bits)); // Object of preposition
         }
         sentence.incBits();
-        Log.d(Constants.TAG, "got sentence " + sentence + " with " + sentence.getBits() + " bits of entropy");
+        Log.d(Constants.TAG, "got sentence '" + sentence + "' with " + sentence.getBits() + " bits of entropy");
 
         // uppercase first character, end with dot (without increasing the bits)
         sentence.getBuilder().replace(0, 1,
-- 
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