Move identicon and toID to mpw native.

Clean out all unused Java MPAlgorithm stuff.

Fix master password entries stuck in memory.

platform-independent/c/core/src/java/com_lyndir_masterpassword_MPAlgorithm_Version.h

@@ -7,8 +7,6 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-#undef com_lyndir_masterpassword_MPAlgorithm_Version_AES_BLOCKSIZE
-#define com_lyndir_masterpassword_MPAlgorithm_Version_AES_BLOCKSIZE 128L
 /*
  * Class:     com_lyndir_masterpassword_MPAlgorithm_Version
  * Method:    _masterKey
@@ -41,6 +39,22 @@ JNIEXPORT jstring JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Versio
 JNIEXPORT jstring JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Version__1siteState
   (JNIEnv *, jobject, jbyteArray, jbyteArray, jstring, jlong, jint, jstring, jint, jstring, jint);
 
+/*
+ * Class:     com_lyndir_masterpassword_MPAlgorithm_Version
+ * Method:    _identicon
+ * Signature: (Ljava/lang/String;[B)Lcom/lyndir/masterpassword/MPIdenticon;
+ */
+JNIEXPORT jobject JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Version__1identicon
+  (JNIEnv *, jobject, jstring, jbyteArray);
+
+/*
+ * Class:     com_lyndir_masterpassword_MPAlgorithm_Version
+ * Method:    _toID
+ * Signature: ([B)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Version__1toID
+  (JNIEnv *, jobject, jbyteArray);
+
 #ifdef __cplusplus
 }
 #endif

platform-independent/c/core/src/mpw-jni.c

@@ -20,23 +20,23 @@ bool mpw_log_sink_jni(const MPLogEvent *record) {
 
     if (logger && (*env)->PushLocalFrame( env, 16 ) == OK) {
         jmethodID method = NULL;
-        jclass Logger = (*env)->GetObjectClass( env, logger );
+        jclass cLogger = (*env)->GetObjectClass( env, logger );
         switch (record->level) {
             case LogLevelTrace:
-                method = (*env)->GetMethodID( env, Logger, "trace", "(Ljava/lang/String;)V" );
+                method = (*env)->GetMethodID( env, cLogger, "trace", "(Ljava/lang/String;)V" );
                 break;
             case LogLevelDebug:
-                method = (*env)->GetMethodID( env, Logger, "debug", "(Ljava/lang/String;)V" );
+                method = (*env)->GetMethodID( env, cLogger, "debug", "(Ljava/lang/String;)V" );
                 break;
             case LogLevelInfo:
-                method = (*env)->GetMethodID( env, Logger, "info", "(Ljava/lang/String;)V" );
+                method = (*env)->GetMethodID( env, cLogger, "info", "(Ljava/lang/String;)V" );
                 break;
             case LogLevelWarning:
-                method = (*env)->GetMethodID( env, Logger, "warn", "(Ljava/lang/String;)V" );
+                method = (*env)->GetMethodID( env, cLogger, "warn", "(Ljava/lang/String;)V" );
                 break;
             case LogLevelError:
             case LogLevelFatal:
-                method = (*env)->GetMethodID( env, Logger, "error", "(Ljava/lang/String;)V" );
+                method = (*env)->GetMethodID( env, cLogger, "error", "(Ljava/lang/String;)V" );
                 break;
         }
 
@@ -57,29 +57,39 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
     if ((*vm)->GetEnv( _vm = vm, (void **)&env, JNI_VERSION_1_6 ) != JNI_OK)
         return -1;
 
-    jclass LoggerFactory = (*env)->FindClass( env, "org/slf4j/LoggerFactory" );
+    do {
-    jmethodID method = (*env)->GetStaticMethodID( env, LoggerFactory, "getLogger", "(Ljava/lang/String;)Lorg/slf4j/Logger;" );
+        jclass cLoggerFactory = (*env)->FindClass( env, "org/slf4j/LoggerFactory" );
+        if (!cLoggerFactory)
+            break;
+        jmethodID method = (*env)->GetStaticMethodID( env, cLoggerFactory, "getLogger", "(Ljava/lang/String;)Lorg/slf4j/Logger;" );
+        if (!method)
+            break;
         jstring name = (*env)->NewStringUTF( env, "com.lyndir.masterpassword.algorithm" );
-    if (LoggerFactory && method && name)
+        if (!name)
-        logger = (*env)->NewGlobalRef( env, (*env)->CallStaticObjectMethod( env, LoggerFactory, method, name ) );
+            break;
-    else
+        logger = (*env)->NewGlobalRef( env, (*env)->CallStaticObjectMethod( env, cLoggerFactory, method, name ) );
-        wrn( "Couldn't initialize JNI logger." );
+        if (!logger)
+            break;
 
-    jclass Logger = (*env)->GetObjectClass( env, logger );
+        jclass cLogger = (*env)->GetObjectClass( env, logger );
-    if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, Logger, "isTraceEnabled", "()Z" ) ))
+        if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, cLogger, "isTraceEnabled", "()Z" ) ))
             mpw_verbosity = LogLevelTrace;
-    else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, Logger, "isDebugEnabled", "()Z" ) ))
+        else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, cLogger, "isDebugEnabled", "()Z" ) ))
             mpw_verbosity = LogLevelDebug;
-    else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, Logger, "isInfoEnabled", "()Z" ) ))
+        else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, cLogger, "isInfoEnabled", "()Z" ) ))
             mpw_verbosity = LogLevelInfo;
-    else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, Logger, "isWarnEnabled", "()Z" ) ))
+        else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, cLogger, "isWarnEnabled", "()Z" ) ))
             mpw_verbosity = LogLevelWarning;
-    else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, Logger, "isErrorEnabled", "()Z" ) ))
+        else if ((*env)->CallBooleanMethod( env, logger, (*env)->GetMethodID( env, cLogger, "isErrorEnabled", "()Z" ) ))
             mpw_verbosity = LogLevelError;
         else
             mpw_verbosity = LogLevelFatal;
 
         mpw_log_sink_register( &mpw_log_sink_jni );
+    } while (false);
+
+    if (!logger)
+        wrn( "Couldn't initialize JNI logger." );
 
     return JNI_VERSION_1_6;
 }
@@ -206,3 +216,51 @@ JNIEXPORT jstring JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Versio
 
     return siteState;
 }
+
+/* native MPIdenticon _identicon(final String fullName, final byte[] masterPassword) */
+JNIEXPORT jobject JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Version__1identicon(JNIEnv *env, jobject obj,
+        jstring fullName, jbyteArray masterPassword) {
+
+    if (!fullName || !masterPassword)
+        return NULL;
+
+    const char *fullNameString = (*env)->GetStringUTFChars( env, fullName, NULL );
+    jbyte *masterPasswordString = (*env)->GetByteArrayElements( env, masterPassword, NULL );
+
+    MPIdenticon identicon = mpw_identicon( fullNameString, (char *)masterPasswordString );
+    (*env)->ReleaseStringUTFChars( env, fullName, fullNameString );
+    (*env)->ReleaseByteArrayElements( env, masterPassword, masterPasswordString, JNI_ABORT );
+    if (identicon.color == MPIdenticonColorUnset)
+        return NULL;
+
+    jclass cMPIdenticonColor = (*env)->FindClass( env, "com/lyndir/masterpassword/MPIdenticon$Color" );
+    if (!cMPIdenticonColor)
+        return NULL;
+    jmethodID method = (*env)->GetStaticMethodID( env, cMPIdenticonColor, "values", "()[Lcom/lyndir/masterpassword/MPIdenticon$Color;" );
+    if (!method)
+        return NULL;
+    jobject values = (*env)->CallStaticObjectMethod( env, cMPIdenticonColor, method );
+    if (!values)
+        return NULL;
+
+    jclass cMPIdenticon = (*env)->FindClass( env, "com/lyndir/masterpassword/MPIdenticon" );
+    if (!cMPIdenticon)
+        return NULL;
+    jmethodID init = (*env)->GetMethodID( env, cMPIdenticon, "<init>", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lcom/lyndir/masterpassword/MPIdenticon$Color;)V" );
+    if (!init)
+        return NULL;
+
+    return (*env)->NewObject( env, cMPIdenticon, init, fullName,
+            (*env)->NewStringUTF( env, identicon.leftArm ),
+            (*env)->NewStringUTF( env, identicon.body ),
+            (*env)->NewStringUTF( env, identicon.rightArm ),
+            (*env)->NewStringUTF( env, identicon.accessory ),
+            (*env)->GetObjectArrayElement( env, values, identicon.color ) );
+}
+
+/* native String _toID(final byte[] buffer) */
+JNIEXPORT jstring JNICALL Java_com_lyndir_masterpassword_MPAlgorithm_00024Version__1toID(JNIEnv *env, jobject obj,
+        jbyteArray buffer) {
+
+    return (*env)->NewStringUTF( env, mpw_id_buf( (*env)->GetByteArrayElements( env, buffer, NULL ), (*env)->GetArrayLength( env, buffer ) ) );
+}

platform-independent/c/core/src/mpw-types.h

@@ -120,18 +120,17 @@ typedef mpw_enum ( uint32_t, MPCounterValue ) {
 
 /** These colours are compatible with the original ANSI SGR. */
 typedef mpw_enum( uint8_t, MPIdenticonColor ) {
-    MPIdenticonColorBlack,
+    MPIdenticonColorUnset,
     MPIdenticonColorRed,
     MPIdenticonColorGreen,
     MPIdenticonColorYellow,
     MPIdenticonColorBlue,
     MPIdenticonColorMagenta,
     MPIdenticonColorCyan,
-    MPIdenticonColorWhite,
+    MPIdenticonColorMono,
 
-    MPIdenticonColorUnset = MPIdenticonColorBlack,
     MPIdenticonColorFirst = MPIdenticonColorRed,
-    MPIdenticonColorLast = MPIdenticonColorWhite,
+    MPIdenticonColorLast = MPIdenticonColorMono,
 };
 
 typedef struct {

platform-independent/java/algorithm/src/main/java/com/lyndir/masterpassword/MPAlgorithm.java

@@ -87,6 +87,29 @@ public interface MPAlgorithm {
                      MPKeyPurpose keyPurpose, @Nullable String keyContext,
                      MPResultType resultType, String resultParam);
 
+    /**
+     * Derive an identicon that represents the user's identity in a visually recognizable way.
+     *
+     * @param fullName       The name of the user whose identity is described by the key.
+     * @param masterPassword The user's secret that authenticates his access to the identity.
+     */
+    MPIdenticon identicon(final String fullName, final char[] masterPassword);
+
+    /**
+     * Encode a fingerprint for a message.
+     */
+    String toID(final String string);
+
+    /**
+     * Encode a fingerprint for a char buffer.
+     */
+    String toID(final char[] message);
+
+    /**
+     * Encode a fingerprint for a byte buffer.
+     */
+    String toID(final byte[] buffer);
+
     // Configuration
 
     /**
@@ -125,69 +148,6 @@ public interface MPAlgorithm {
     @Nonnull
     Charset mpw_charset();
 
-    /**
-     * mpw: Platform-agnostic byte order.
-     */
-    @Nonnull
-    ByteOrder mpw_byteOrder();
-
-    /**
-     * mpw: Key ID hash.
-     */
-    @Nonnull
-    MessageDigests mpw_hash();
-
-    /**
-     * mpw: Site digest.
-     */
-    @Nonnull
-    MessageAuthenticationDigests mpw_digest();
-
-    /**
-     * mpw: Master key size (byte).
-     */
-    int mpw_dkLen();
-
-    /**
-     * mpw: Minimum size for derived keys (bit).
-     */
-    int mpw_keySize_min();
-
-    /**
-     * mpw: Maximum size for derived keys (bit).
-     */
-    int mpw_keySize_max();
-
-    /**
-     * mpw: validity for the time-based rolling counter (s).
-     */
-    long mpw_otp_window();
-
-    /**
-     * scrypt: CPU cost parameter.
-     */
-    int scrypt_N();
-
-    /**
-     * scrypt: Memory cost parameter.
-     */
-    int scrypt_r();
-
-    /**
-     * scrypt: Parallelization parameter.
-     */
-    int scrypt_p();
-
-    // Utilities
-
-    byte[] toBytes(final int number);
-
-    byte[] toBytes(final UnsignedInteger number);
-
-    byte[] toBytes(final char[] characters);
-
-    byte[] toID(final byte[] bytes);
-
     /**
      * The algorithm iterations.
      */
@@ -222,10 +182,6 @@ public interface MPAlgorithm {
 
         public static final Version CURRENT = V3;
 
-        @SuppressWarnings("HardcodedFileSeparator")
-        private static final String AES_TRANSFORMATION = "AES/CBC/PKCS5Padding";
-        private static final int    AES_BLOCKSIZE      = 128 /* bit */;
-
         static {
             if (!Native.load( MPAlgorithm.class, "mpw" ))
                 Logger.get( MPAlgorithm.class ).err( "Native mpw library unavailable." );
@@ -321,6 +277,70 @@ public interface MPAlgorithm {
                                            final int keyPurpose, @Nullable final String keyContext,
                                            final int resultType, final String resultParam, final int algorithmVersion);
 
+        @Nullable
+        @Override
+        public MPIdenticon identicon(final String fullName, final char[] masterPassword) {
+
+            // Create a memory-safe NUL-terminated UTF-8 C-string byte array variant of masterPassword.
+            CharsetEncoder encoder             = mpw_charset().newEncoder();
+            byte[]         masterPasswordBytes = new byte[(int) (masterPassword.length * (double) encoder.maxBytesPerChar()) + 1];
+            try {
+                Arrays.fill( masterPasswordBytes, (byte) 0 );
+                ByteBuffer masterPasswordBuffer = ByteBuffer.wrap( masterPasswordBytes );
+
+                CoderResult result = encoder.encode( CharBuffer.wrap( masterPassword ), masterPasswordBuffer, true );
+                if (result.isError())
+                    throw new IllegalStateException( result.toString() );
+                result = encoder.flush( masterPasswordBuffer );
+                if (result.isError())
+                    throw new IllegalStateException( result.toString() );
+
+                return _identicon( fullName, masterPasswordBytes );
+            }
+            finally {
+                Arrays.fill( masterPasswordBytes, (byte) 0 );
+            }
+        }
+
+        @Nullable
+        protected native MPIdenticon _identicon(final String fullName, final byte[] masterPassword);
+
+        @Override
+        public String toID(final String message) {
+            return toID( message.toCharArray() );
+        }
+
+        @Override
+        public String toID(final char[] message) {
+            // Create a memory-safe NUL-terminated UTF-8 C-string byte array variant of masterPassword.
+            CharsetEncoder encoder             = mpw_charset().newEncoder();
+            byte[]         messageBytes = new byte[(int) (message.length * (double) encoder.maxBytesPerChar()) + 1];
+            try {
+                Arrays.fill( messageBytes, (byte) 0 );
+                ByteBuffer messageBuffer = ByteBuffer.wrap( messageBytes );
+
+                CoderResult result = encoder.encode( CharBuffer.wrap( message ), messageBuffer, true );
+                if (result.isError())
+                    throw new IllegalStateException( result.toString() );
+                result = encoder.flush( messageBuffer );
+                if (result.isError())
+                    throw new IllegalStateException( result.toString() );
+
+                return toID( messageBytes );
+            }
+            finally {
+                Arrays.fill( messageBytes, (byte) 0 );
+            }
+        }
+
+        @Override
+        public String toID(final byte[] buffer) {
+            return _toID( buffer );
+        }
+
+        @Nullable
+        protected native String _toID(final byte[] buffer);
+
         // Configuration
 
         @Nonnull
@@ -358,93 +378,5 @@ public interface MPAlgorithm {
         public Charset mpw_charset() {
             return Charsets.UTF_8;
         }
-
-        @Nonnull
-        @Override
-        public ByteOrder mpw_byteOrder() {
-            return ByteOrder.BIG_ENDIAN;
-        }
-
-        @Nonnull
-        @Override
-        public MessageDigests mpw_hash() {
-            return MessageDigests.SHA256;
-        }
-
-        @Nonnull
-        @Override
-        public MessageAuthenticationDigests mpw_digest() {
-            return MessageAuthenticationDigests.HmacSHA256;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int mpw_dkLen() {
-            return 64;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int mpw_keySize_min() {
-            return 128;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int mpw_keySize_max() {
-            return 512;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public long mpw_otp_window() {
-            return 5 * 60 /* s */;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int scrypt_N() {
-            return 32768;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int scrypt_r() {
-            return 8;
-        }
-
-        @Override
-        @SuppressWarnings("MagicNumber")
-        public int scrypt_p() {
-            return 2;
-        }
-
-        // Utilities
-
-        @Nonnull
-        public byte[] toBytes(final int number) {
-            return ByteBuffer.allocate( Integer.SIZE / Byte.SIZE ).order( mpw_byteOrder() ).putInt( number ).array();
-        }
-
-        @Nonnull
-        public byte[] toBytes(final UnsignedInteger number) {
-            return ByteBuffer.allocate( Integer.SIZE / Byte.SIZE ).order( mpw_byteOrder() ).putInt( number.intValue() ).array();
-        }
-
-        @Nonnull
-        public byte[] toBytes(final char[] characters) {
-            ByteBuffer byteBuffer = mpw_charset().encode( CharBuffer.wrap( characters ) );
-
-            byte[] bytes = new byte[byteBuffer.remaining()];
-            byteBuffer.get( bytes );
-
-            Arrays.fill( byteBuffer.array(), (byte) 0 );
-            return bytes;
-        }
-
-        @Nonnull
-        public byte[] toID(final byte[] bytes) {
-            return mpw_hash().of( bytes );
-        }
     }
 }

platform-independent/java/algorithm/src/main/java/com/lyndir/masterpassword/MPIdenticon.java

@@ -20,14 +20,8 @@ package com.lyndir.masterpassword;
 
 import static com.lyndir.lhunath.opal.system.util.StringUtils.*;
 
-import com.google.common.base.Charsets;
-import com.google.common.primitives.UnsignedBytes;
-import com.lyndir.lhunath.opal.system.MessageAuthenticationDigests;
 import com.lyndir.lhunath.opal.system.logging.Logger;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
-import java.nio.*;
-import java.nio.charset.Charset;
-import java.util.Arrays;
 import java.util.Locale;
 
 
@@ -39,43 +33,23 @@ public class MPIdenticon {
     @SuppressWarnings("UnusedDeclaration")
     private static final Logger logger = Logger.get( MPIdenticon.class );
 
-    private static final Charset charset   = Charsets.UTF_8;
-    private static final Color[] colors    = {
-            Color.RED, Color.GREEN, Color.YELLOW, Color.BLUE, Color.MAGENTA, Color.CYAN, Color.MONO };
-    private static final char[]  leftArm   = { '╔', '╚', '╰', '═' };
-    private static final char[]  rightArm  = { '╗', '╝', '╯', '═' };
-    private static final char[]  body      = { '█', '░', '▒', '▓', '☺', '☻' };
-    private static final char[]  accessory = {
-            '◈', '◎', '◐', '◑', '◒', '◓', '☀', '☁', '☂', '☃', '☄', '★', '☆', '☎', '☏', '⎈', '⌂', '☘', '☢', '☣', '☕', '⌚', '⌛', '⏰', '⚡',
-            '⛄', '⛅', '☔', '♔', '♕', '♖', '♗', '♘', '♙', '♚', '♛', '♜', '♝', '♞', '♟', '♨', '♩', '♪', '♫', '⚐', '⚑', '⚔', '⚖', '⚙', '⚠',
-            '⌘', '⏎', '✄', '✆', '✈', '✉', '✌' };
-
     private final String fullName;
+    private final String leftArm;
+    private final String body;
+    private final String rightArm;
+    private final String accessory;
     private final Color  color;
-    private final String text;
-
-    public MPIdenticon(final String fullName, final String masterPassword) {
-        this( fullName, masterPassword.toCharArray() );
-    }
 
     @SuppressFBWarnings("CLI_CONSTANT_LIST_INDEX")
     @SuppressWarnings("MethodCanBeVariableArityMethod")
-    public MPIdenticon(final String fullName, final char[] masterPassword) {
+    public MPIdenticon(final String fullName, final String leftArm, final String body, final String rightArm, final String accessory,
+                       final Color color) {
         this.fullName = fullName;
-
+        this.leftArm = leftArm;
-        byte[] masterPasswordBytes = charset.encode( CharBuffer.wrap( masterPassword ) ).array();
+        this.body = body;
-        ByteBuffer identiconSeedBytes = ByteBuffer.wrap(
+        this.rightArm = rightArm;
-                MessageAuthenticationDigests.HmacSHA256.of( masterPasswordBytes, fullName.getBytes( charset ) ) );
+        this.accessory = accessory;
-        Arrays.fill( masterPasswordBytes, (byte) 0 );
+        this.color = color;
-
-        IntBuffer identiconSeedBuffer = IntBuffer.allocate( identiconSeedBytes.capacity() );
-        while (identiconSeedBytes.hasRemaining())
-            identiconSeedBuffer.put( UnsignedBytes.toInt( identiconSeedBytes.get() ) );
-        int[] identiconSeed = identiconSeedBuffer.array();
-
-        color = colors[identiconSeed[4] % colors.length];
-        text = strf( "%c%c%c%c", leftArm[identiconSeed[0] % leftArm.length], body[identiconSeed[1] % body.length],
-                     rightArm[identiconSeed[2] % rightArm.length], accessory[identiconSeed[3] % accessory.length] );
     }
 
     public String getFullName() {
@@ -83,11 +57,11 @@ public class MPIdenticon {
     }
 
     public String getText() {
-        return text;
+        return strf( "%s%s%s%s", this.leftArm, this.body, this.rightArm, this.accessory );
     }
 
     public String getHTML() {
-        return strf( "<span style='color: %s'>%s</span>", color.getCSS(), text );
+        return strf( "<span style='color: %s'>%s</span>", color.getCSS(), getText() );
     }
 
     public Color getColor() {
@@ -95,6 +69,12 @@ public class MPIdenticon {
     }
 
     public enum Color {
+        UNSET {
+            @Override
+            public String getCSS() {
+                return "inherit";
+            }
+        },
         RED,
         GREEN,
         YELLOW,

platform-independent/java/algorithm/src/main/java/com/lyndir/masterpassword/MPMasterKey.java

@@ -55,6 +55,18 @@ public class MPMasterKey {
         Arrays.fill( masterPassword, (char) 0 );
     }
 
+    @Override
+    protected void finalize()
+            throws Throwable {
+
+        if (isValid()) {
+            logger.wrn( "A master key for %s was abandoned without being invalidated.", getFullName() );
+            invalidate();
+        }
+
+        super.finalize();
+    }
+
     @Nonnull
     public String getFullName() {
 
@@ -67,7 +79,7 @@ public class MPMasterKey {
      * @throws MPKeyUnavailableException {@link #invalidate()} has been called on this object.
      */
     @Nonnull
-    public byte[] getKeyID(final MPAlgorithm algorithm)
+    public String getKeyID(final MPAlgorithm algorithm)
             throws MPKeyUnavailableException, MPAlgorithmException {
 
         return algorithm.toID( masterKey( algorithm ) );
@@ -98,11 +110,6 @@ public class MPMasterKey {
 
         byte[] masterKey = keyByVersion.get( algorithm.version() );
         if (masterKey == null) {
-            logger.trc( "-- mpw_masterKey (algorithm: %s)", algorithm );
-            logger.trc( "fullName: %s", fullName );
-            logger.trc( "masterPassword.id: %s", CodeUtils.encodeHex(
-                    algorithm.toID( algorithm.toBytes( masterPassword ) ) ) );
-
             keyByVersion.put( algorithm.version(), masterKey = algorithm.masterKey( fullName, masterPassword ) );
         }
         if (masterKey == null)
@@ -118,13 +125,6 @@ public class MPMasterKey {
         Preconditions.checkArgument( !siteName.isEmpty() );
 
         byte[] masterKey = masterKey( algorithm );
-
-        logger.trc( "-- mpw_siteKey (algorithm: %s)", algorithm );
-        logger.trc( "siteName: %s", siteName );
-        logger.trc( "siteCounter: %s", siteCounter );
-        logger.trc( "keyPurpose: %d (%s)", keyPurpose.toInt(), keyPurpose.getShortName() );
-        logger.trc( "keyContext: %s", keyContext );
-
         byte[] siteKey = algorithm.siteKey( masterKey, siteName, siteCounter, keyPurpose, keyContext );
         if (siteKey == null)
             throw new MPAlgorithmException( "Could not derive site key." );
@@ -161,10 +161,6 @@ public class MPMasterKey {
         byte[] masterKey = masterKey( algorithm );
         byte[] siteKey   = siteKey( siteName, algorithm, siteCounter, keyPurpose, keyContext );
 
-        logger.trc( "-- mpw_siteResult (algorithm: %s)", algorithm );
-        logger.trc( "resultType: %d (%s)", resultType.getType(), resultType.getShortName() );
-        logger.trc( "resultParam: %s", resultParam );
-
         String siteResult = algorithm.siteResult(
                 masterKey, siteKey, siteName, siteCounter, keyPurpose, keyContext, resultType, resultParam );
         if (siteResult == null)
@@ -199,10 +195,6 @@ public class MPMasterKey {
         byte[] masterKey = masterKey( algorithm );
         byte[] siteKey   = siteKey( siteName, algorithm, siteCounter, keyPurpose, keyContext );
 
-        logger.trc( "-- mpw_siteState (algorithm: %s)", algorithm );
-        logger.trc( "resultType: %d (%s)", resultType.getType(), resultType.getShortName() );
-        logger.trc( "resultParam: %d bytes = %s", resultParam.getBytes( algorithm.mpw_charset() ).length, resultParam );
-
         String siteState = algorithm.siteState(
                 masterKey, siteKey, siteName, siteCounter, keyPurpose, keyContext, resultType, resultParam );
         if (siteState == null)

platform-independent/java/gui/src/main/java/com/lyndir/masterpassword/gui/model/MPIncognitoUser.java

@@ -35,7 +35,7 @@ public class MPIncognitoUser extends MPBasicUser<MPIncognitoSite> {
 
     @Nullable
     @Override
-    public byte[] getKeyID() {
+    public String getKeyID() {
         return null;
     }
 

platform-independent/java/gui/src/main/java/com/lyndir/masterpassword/gui/util/Components.java

@@ -35,6 +35,7 @@ import javax.swing.border.Border;
 import javax.swing.border.CompoundBorder;
 import javax.swing.event.HyperlinkEvent;
 import javax.swing.text.*;
+import javax.swing.undo.UndoableEdit;
 import org.jetbrains.annotations.NonNls;
 
 
@@ -207,7 +208,13 @@ public abstract class Components {
     }
 
     public static JPasswordField passwordField() {
-        return new JPasswordField() {
+        return new JPasswordField( new PlainDocument( new GapContent() {
+            @Override
+            public String getString(final int where, final int len)
+                    throws BadLocationException {
+                return "";
+            }
+        } ), null, 0 ) {
             {
                 setBorder( BorderFactory.createCompoundBorder( BorderFactory.createLineBorder( Res.colors().controlBorder(), 1, true ),
                                                                BorderFactory.createEmptyBorder( 4, 4, 4, 4 ) ) );

platform-independent/java/gui/src/main/java/com/lyndir/masterpassword/gui/util/Res.java

@@ -182,7 +182,7 @@ public abstract class Res {
 
     public static final class Fonts {
 
-        public Font emoticonsFont(final int size) {
+        public Font identiconFont(final int size) {
             return MPFont.emoticonsRegular.get( size );
         }
 

platform-independent/java/gui/src/main/java/com/lyndir/masterpassword/gui/view/UserContentPanel.java

@@ -317,7 +317,7 @@ public class UserContentPanel extends JPanel implements State.Listener, MPUser.L
             add( Components.strut() );
 
             add( identiconLabel = Components.label( SwingConstants.CENTER ) );
-            identiconLabel.setFont( Res.fonts().emoticonsFont( Components.TEXT_SIZE_CONTROL ) );
+            identiconLabel.setFont( Res.fonts().identiconFont( Components.TEXT_SIZE_CONTROL ) );
             add( Box.createGlue() );
 
             add( Components.label( "Master Password:" ) );
@@ -330,6 +330,15 @@ public class UserContentPanel extends JPanel implements State.Listener, MPUser.L
             add( Box.createGlue() );
         }
 
+        @Override
+        public void removeNotify() {
+            char[] password = masterPasswordField.getPassword();
+            Arrays.fill( password, (char) 0 );
+            masterPasswordField.setText( new String( password ) );
+
+            super.removeNotify();
+        }
+
         private void exportUser() {
             MPFileUser fileUser = (user instanceof MPFileUser)? (MPFileUser) user: null;
             if (fileUser == null)
@@ -449,7 +458,8 @@ public class UserContentPanel extends JPanel implements State.Listener, MPUser.L
         private void updateIdenticon() {
             char[] masterPassword = masterPasswordField.getPassword();
             MPIdenticon identicon = ((masterPassword != null) && (masterPassword.length > 0))?
-                    new MPIdenticon( user.getFullName(), masterPassword ): null;
+                    user.getAlgorithm().identicon( user.getFullName(), masterPassword ): null;
+            Arrays.fill( masterPassword, (char) 0 );
 
             Res.ui( () -> {
                 if (identicon != null) {
@@ -779,7 +789,7 @@ public class UserContentPanel extends JPanel implements State.Listener, MPUser.L
             typeModel.selection( MPResultType.DeriveKey, t -> {
                 switch (t) {
                     case DeriveKey:
-                        stateModel.setText( Integer.toString( site.getAlgorithm().mpw_keySize_min() ) );
+                        stateModel.setText( "128" );
                         break;
 
                     default:

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/MPUser.java

@@ -49,10 +49,7 @@ public interface MPUser<S extends MPSite<?>> extends Comparable<MPUser<?>> {
     void setAlgorithm(MPAlgorithm algorithm);
 
     @Nullable
-    byte[] getKeyID();
+    String getKeyID();
-
-    @Nullable
-    String exportKeyID();
 
     /**
      * Performs an authentication attempt against the keyID for this user.

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/impl/MPBasicUser.java

@@ -100,7 +100,7 @@ public abstract class MPBasicUser<S extends MPBasicSite<?, ?>> extends Changeabl
 
     @Nullable
     @Override
-    public byte[] getKeyID() {
+    public String getKeyID() {
         try {
             if (isMasterKeyAvailable())
                 return getMasterKey().getKeyID( getAlgorithm() );
@@ -112,12 +112,6 @@ public abstract class MPBasicUser<S extends MPBasicSite<?, ?>> extends Changeabl
         return null;
     }
 
-    @Nullable
-    @Override
-    public String exportKeyID() {
-        return CodeUtils.encodeHex( getKeyID() );
-    }
-
     @Override
     public void authenticate(final char[] masterPassword)
             throws MPIncorrectMasterPasswordException, MPAlgorithmException {
@@ -136,8 +130,8 @@ public abstract class MPBasicUser<S extends MPBasicSite<?, ?>> extends Changeabl
             throw new IllegalArgumentException(
                     "Master key (for " + masterKey.getFullName() + ") is not for this user (" + getFullName() + ")." );
 
-        byte[] keyID = getKeyID();
+        String keyID = getKeyID();
-        if ((keyID != null) && !Arrays.equals( masterKey.getKeyID( getAlgorithm() ), keyID ))
+        if (keyID != null && !keyID.equalsIgnoreCase( masterKey.getKeyID( getAlgorithm() ) ))
             throw new MPIncorrectMasterPasswordException( this );
 
         this.masterKey = masterKey;

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/impl/MPFileUser.java

@@ -39,7 +39,7 @@ public class MPFileUser extends MPBasicUser<MPFileSite> {
     private static final Logger logger = Logger.get( MPFileUser.class );
 
     @Nullable
-    private byte[]                   keyID;
+    private String                   keyID;
     private File                     file;
     private MPMarshalFormat          format;
     private MPMarshaller.ContentMode contentMode;
@@ -62,18 +62,18 @@ public class MPFileUser extends MPBasicUser<MPFileSite> {
         this( fullName, null, MPAlgorithm.Version.CURRENT, location );
     }
 
-    public MPFileUser(final String fullName, @Nullable final byte[] keyID, final MPAlgorithm algorithm, final File location) {
+    public MPFileUser(final String fullName, @Nullable final String keyID, final MPAlgorithm algorithm, final File location) {
         this( fullName, keyID, algorithm, 0, null, new Instant(), false,
               MPMarshaller.ContentMode.PROTECTED, MPMarshalFormat.DEFAULT, location );
     }
 
     @SuppressFBWarnings("PATH_TRAVERSAL_IN")
-    public MPFileUser(final String fullName, @Nullable final byte[] keyID, final MPAlgorithm algorithm, final int avatar,
+    public MPFileUser(final String fullName, @Nullable final String keyID, final MPAlgorithm algorithm, final int avatar,
                       @Nullable final MPResultType defaultType, final ReadableInstant lastUsed, final boolean hidePasswords,
                       final MPMarshaller.ContentMode contentMode, final MPMarshalFormat format, final File location) {
         super( avatar, fullName, algorithm );
 
-        this.keyID = (keyID != null)? keyID.clone(): null;
+        this.keyID = keyID;
         this.lastUsed = lastUsed;
         this.preferences = new MPFileUserPreferences( this, defaultType, hidePasswords );
         this.format = format;
@@ -87,8 +87,8 @@ public class MPFileUser extends MPBasicUser<MPFileSite> {
 
     @Nullable
     @Override
-    public byte[] getKeyID() {
+    public String getKeyID() {
-        return (keyID == null)? null: keyID.clone();
+        return keyID;
     }
 
     @Nonnull

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/impl/MPFlatMarshaller.java

@@ -54,7 +54,7 @@ public class MPFlatMarshaller implements MPMarshaller {
         content.append( "# User Name: " ).append( user.getFullName() ).append( '\n' );
         content.append( "# Full Name: " ).append( user.getFullName() ).append( '\n' );
         content.append( "# Avatar: " ).append( user.getAvatar() ).append( '\n' );
-        content.append( "# Key ID: " ).append( user.exportKeyID() ).append( '\n' );
+        content.append( "# Key ID: " ).append( user.getKeyID() ).append( '\n' );
         content.append( "# Algorithm: " ).append( user.getAlgorithm().version().toInt() ).append( '\n' );
         content.append( "# Default Type: " ).append( user.getPreferences().getDefaultType().getType() ).append( '\n' );
         content.append( "# Passwords: " ).append( user.getContentMode().name() ).append( '\n' );

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/impl/MPFlatUnmarshaller.java

@@ -51,7 +51,7 @@ public class MPFlatUnmarshaller implements MPUnmarshaller {
     public MPFileUser readUser(@Nonnull final File file)
             throws IOException, MPMarshalException {
         try (Reader reader = new InputStreamReader( new FileInputStream( file ), Charsets.UTF_8 )) {
-            byte[]       keyID        = null;
+            String       keyID        = null;
             String       fullName     = null;
             int          mpVersion    = 0, avatar = 0;
             boolean      clearContent = false, headerStarted = false;
@@ -84,7 +84,7 @@ public class MPFlatUnmarshaller implements MPUnmarshaller {
                             if ("Full Name".equalsIgnoreCase( name ) || "User Name".equalsIgnoreCase( name ))
                                 fullName = value;
                             else if ("Key ID".equalsIgnoreCase( name ))
-                                keyID = CodeUtils.decodeHex( value );
+                                keyID = value;
                             else if ("Algorithm".equalsIgnoreCase( name ))
                                 mpVersion = ConversionUtils.toIntegerNN( value );
                             else if ("Avatar".equalsIgnoreCase( name ))

platform-independent/java/model/src/main/java/com/lyndir/masterpassword/model/impl/MPJSONFile.java

@@ -61,7 +61,7 @@ public class MPJSONFile extends MPJSONAnyObject {
         user.avatar = modelUser.getAvatar();
         user.full_name = modelUser.getFullName();
         user.last_used = MPModelConstants.dateTimeFormatter.print( modelUser.getLastUsed() );
-        user.key_id = modelUser.exportKeyID();
+        user.key_id = modelUser.getKeyID();
         user.algorithm = modelUser.getAlgorithm().version();
         user._ext_mpw = new User.Ext() {
             {
@@ -131,7 +131,7 @@ public class MPJSONFile extends MPJSONAnyObject {
         MPAlgorithm algorithm = ifNotNullElse( user.algorithm, MPAlgorithm.Version.CURRENT );
 
         return new MPFileUser(
-                user.full_name, CodeUtils.decodeHex( user.key_id ), algorithm, user.avatar,
+                user.full_name, user.key_id, algorithm, user.avatar,
                 (user._ext_mpw != null)? user._ext_mpw.default_type: null,
                 (user.last_used != null)? MPModelConstants.dateTimeFormatter.parseDateTime( user.last_used ): new Instant(),
                 (user._ext_mpw != null) && user._ext_mpw.hide_passwords,

platform-independent/java/tests/src/test/java/com/lyndir/masterpassword/MPMasterKeyTest.java

@@ -53,9 +53,8 @@ public class MPMasterKeyTest {
             MPMasterKey masterKey      = new MPMasterKey( testCase.getFullName(), masterPassword );
 
             // Test key
-            assertEquals(
+            assertTrue(
-                    CodeUtils.encodeHex( masterKey.getKeyID( testCase.getAlgorithm() ) ),
+                    testCase.getKeyID().equalsIgnoreCase( masterKey.getKeyID( testCase.getAlgorithm() ) ),
-                    testCase.getKeyID(),
                     "[testMasterKey] keyID mismatch for test case: " + testCase );
 
             // Test invalidation