switch to byte[] for primary passphrase representation

Author: commonsguy

android-database-sqlcipher/src/main/java/net/sqlcipher/database/SupportFactory.java

@@ -19,14 +19,14 @@
 import androidx.sqlite.db.SupportSQLiteOpenHelper;
 
 public class SupportFactory implements SupportSQLiteOpenHelper.Factory {
-    private final char[] passphrase;
+    private final byte[] passphrase;
     private final String postKeySql;
 
-    public SupportFactory(char[] passphrase) {
+    public SupportFactory(byte[] passphrase) {
         this(passphrase, null);
     }
 
-    public SupportFactory(char[] passphrase, String postKeySql) {
+    public SupportFactory(byte[] passphrase, String postKeySql) {
         this.passphrase = passphrase;
         this.postKeySql = postKeySql;
     }

android-database-sqlcipher/src/main/java/net/sqlcipher/database/SupportHelper.java

@@ -21,10 +21,10 @@
 
 public class SupportHelper implements SupportSQLiteOpenHelper {
     private SQLiteOpenHelper standardHelper;
-    private char[] passphrase;
+    private byte[] passphrase;
 
     SupportHelper(final SupportSQLiteOpenHelper.Configuration configuration,
-                  char[] passphrase, final String postKeySql) {
+                  byte[] passphrase, final String postKeySql) {
         SQLiteDatabase.loadLibs(configuration.context);
         this.passphrase = passphrase;
 
@@ -91,7 +91,7 @@ public SupportSQLiteDatabase getWritableDatabase() {
         SQLiteDatabase result = standardHelper.getWritableDatabase(passphrase);
 
         for (int i = 0; i < passphrase.length; i++) {
-            passphrase[i] = (char)0;
+            passphrase[i] = (byte)0;
         }
 
         return result;