-> simplify OlmSession.DecryptMessage

-> Always use javaCStringToUtf8 to convert byte array to String

11 files changed, 80 insertions, 103 deletions

diff --git a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmAccountTest.java b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmAccountTest.java
index 12bc424..b275688 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmAccountTest.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmAccountTest.java
@@ -60,12 +60,8 @@ public class OlmAccountTest {
 
     @BeforeClass
     public static void setUpClass(){
-        // enable UTF-8 specific conversion for pre Marshmallow(23) android versions,
-        // due to issue described here: https://github.com/eclipsesource/J2V8/issues/142
-        boolean isSpecificUtf8ConversionEnabled = android.os.Build.VERSION.SDK_INT < 23;
-
         // load native lib
-        mOlmManager = new OlmManager(isSpecificUtf8ConversionEnabled);
+        mOlmManager = new OlmManager();
 
         String olmLibVersion = mOlmManager.getOlmLibVersion();
         assertNotNull(olmLibVersion);
diff --git a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmGroupSessionTest.java b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmGroupSessionTest.java
index 2152a8d..111032e 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmGroupSessionTest.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmGroupSessionTest.java
@@ -61,13 +61,8 @@ public class OlmGroupSessionTest {
 
     @BeforeClass
     public static void setUpClass(){
-
-        // enable UTF-8 specific conversion for pre Marshmallow(23) android versions,
-        // due to issue described here: https://github.com/eclipsesource/J2V8/issues/142
-        boolean isSpecificUtf8ConversionEnabled = android.os.Build.VERSION.SDK_INT < 23;
-
         // load native lib
-        mOlmManager = new OlmManager(isSpecificUtf8ConversionEnabled);
+        mOlmManager = new OlmManager();
 
         String version = mOlmManager.getOlmLibVersion();
         assertNotNull(version);
@@ -151,13 +146,18 @@ public class OlmGroupSessionTest {
 
     @Test
     public void test10InboundDecryptMessage() {
-        // test decrypted message
-        StringBuffer errorMsg = new StringBuffer();
-        OlmInboundGroupSession.DecryptIndex index = new OlmInboundGroupSession.DecryptIndex();
+        mBobDecryptedMessage = null;
+        OlmInboundGroupSession.DecryptMessageResult result = null;
 
-        mBobDecryptedMessage = mBobInboundGroupSession.decryptMessage(mAliceToBobMessage, index, errorMsg);
+        try {
+            result = mBobInboundGroupSession.decryptMessage(mAliceToBobMessage);
+        } catch (Exception e) {
+        }
+
+        // test decrypted message
+        mBobDecryptedMessage = result.mDecryptedMessage;
         assertFalse(TextUtils.isEmpty(mBobDecryptedMessage));
-        assertTrue(0==index.mIndex);
+        assertTrue(0 == result.mIndex);
     }
 
     @Test
@@ -440,14 +440,17 @@ public class OlmGroupSessionTest {
             assertTrue("Exception in test18TestBadCharacterCrashInDecrypt, Exception code=" + e.getExceptionCode(), false);
         }
 
-        StringBuffer errorMsg = new StringBuffer();
-        OlmInboundGroupSession.DecryptIndex index = new OlmInboundGroupSession.DecryptIndex();
+        OlmInboundGroupSession.DecryptMessageResult result = null;
 
-        String decryptedMessage = bobInboundGroupSession.decryptMessage(msgToDecryptWithEmoji, index, errorMsg);
-        assertNotNull(decryptedMessage);
-        assertTrue(13==index.mIndex);
-    }
+        try {
+            result = bobInboundGroupSession.decryptMessage(msgToDecryptWithEmoji);
+        } catch (Exception e) {
+            assertTrue("Exception in test18TestBadCharacterCrashInDecrypt, Exception code=" + e.getMessage(), false);
+        }
 
+        assertNotNull(result.mDecryptedMessage);
+        assertTrue(13 == result.mIndex);
+    }
 
     /**
      * Specific test to check an error message is returned by decryptMessage() API.<br>
@@ -458,8 +461,6 @@ public class OlmGroupSessionTest {
     public void test19TestErrorMessageReturnedInDecrypt() {
         OlmInboundGroupSession bobInboundGroupSession=null;
         final String EXPECTED_ERROR_MESSAGE= "INVALID_BASE64";
-        StringBuffer errorMsg = new StringBuffer();
-        OlmInboundGroupSession.DecryptIndex index = new OlmInboundGroupSession.DecryptIndex();
 
         String sessionKeyRef    = "AgAAAAycZE6AekIctJWYxd2AWLOY15YmxZODm/WkgbpWkyycp6ytSp/R+wo84jRrzBNWmv6ySLTZ9R0EDOk9VI2eZyQ6Efdwyo1mAvrWvTkZl9yALPdkOIVHywyG65f1SNiLrnsln3hgsT1vUrISGyKtsljoUgQpr3JDPEhD0ilAi63QBjhnGCW252b+7nF+43rb6O6lwm93LaVwe2341Gdp6EkhTUvetALezEqDOtKN00wVqAbq0RQAnUJIowxHbMswg+FyoR1K1oCjnVEoF23O9xlAn5g1XtuBZP3moJlR2lwsBA";
         String corruptedEncryptedMsg = "AwgANYTHINGf87ge45ge7gr*/rg5ganything4gr41rrgr4re55tanythingmcsXUkhDv0UePj922kgf+";
@@ -471,12 +472,15 @@ public class OlmGroupSessionTest {
             assertTrue("Exception in test19TestErrorMessageReturnedInDecrypt, Exception code=" + e.getExceptionCode(), false);
         }
 
-        String decryptedMessage = bobInboundGroupSession.decryptMessage(corruptedEncryptedMsg, index, errorMsg);
+        String exceptionMessage = null;
+        try {
+            bobInboundGroupSession.decryptMessage(corruptedEncryptedMsg);
+        } catch (OlmInboundGroupSession.DecryptMessageException e) {
+            exceptionMessage = e.getMessage();
+        }
+
         assertTrue(0!=EXPECTED_ERROR_MESSAGE.length());
-        assertTrue(EXPECTED_ERROR_MESSAGE.equals(errorMsg.toString()));
-        assertTrue(null==decryptedMessage);
-        assertTrue(0==index.mIndex);
+        assertTrue(EXPECTED_ERROR_MESSAGE.equals(exceptionMessage));
     }
-
 }
 
diff --git a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmSessionTest.java b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmSessionTest.java
index b25d865..099f2a5 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmSessionTest.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmSessionTest.java
@@ -53,12 +53,8 @@ public class OlmSessionTest {
 
     @BeforeClass
     public static void setUpClass(){
-        // enable UTF-8 specific conversion for pre Marshmallow(23) android versions,
-        // due to issue described here: https://github.com/eclipsesource/J2V8/issues/142
-        boolean isSpecificUtf8ConversionEnabled = android.os.Build.VERSION.SDK_INT < 23;
-
         // load native lib
-        mOlmManager = new OlmManager(isSpecificUtf8ConversionEnabled);
+        mOlmManager = new OlmManager();
 
         String version = mOlmManager.getOlmLibVersion();
         assertNotNull(version);
diff --git a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmUtilityTest.java b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmUtilityTest.java
index 9a97205..e3ca544 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmUtilityTest.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/androidTest/java/org/matrix/olm/OlmUtilityTest.java
@@ -44,12 +44,8 @@ public class OlmUtilityTest {
 
     @BeforeClass
     public static void setUpClass(){
-        // enable UTF-8 specific conversion for pre Marshmallow(23) android versions,
-        // due to issue described here: https://github.com/eclipsesource/J2V8/issues/142
-        boolean isSpecificUtf8ConversionEnabled = android.os.Build.VERSION.SDK_INT < 23;
-
         // load native lib
-        mOlmManager = new OlmManager(isSpecificUtf8ConversionEnabled);
+        mOlmManager = new OlmManager();
 
         String version = mOlmManager.getOlmLibVersion();
         assertNotNull(version);
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java
index 2e32a30..61d0ec6 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java
@@ -42,14 +42,26 @@ public class OlmInboundGroupSession extends CommonSerializeUtils implements Seri
     private transient long mNativeId;
 
     /**
-     * Wrapper class to be used in {@link #decryptMessage(String, DecryptIndex, StringBuffer)}
+     * Result in {@link #decryptMessage(String)}
      */
-    static public class DecryptIndex {
+    static class DecryptMessageResult {
+        /** decrypt message **/
+        public String mDecryptedMessage;
+
         /** decrypt index **/
         public long mIndex;
     }
 
     /**
+     * Exception triggered in {@link #decryptMessage(String)}
+     */
+    static public class DecryptMessageException extends Exception {
+        public DecryptMessageException(String message) {
+            super(message);
+        }
+    }
+
+    /**
      * Constructor.<br>
      * Create and save a new native session instance ID and start a new inbound group session.
      * The session key parameter is retrieved from an outbound group session
@@ -59,7 +71,7 @@ public class OlmInboundGroupSession extends CommonSerializeUtils implements Seri
      */
     public OlmInboundGroupSession(String aSessionKey) throws OlmException {
         if(createNewSession()) {
-            if( 0 != initInboundGroupSessionWithSessionKey(aSessionKey)) {
+            if (0 != initInboundGroupSessionWithSessionKey(aSessionKey)) {
                 releaseSession();// prevent memory leak before throwing
                 throw new OlmException(OlmException.EXCEPTION_CODE_INIT_INBOUND_GROUP_SESSION,OlmException.EXCEPTION_MSG_INIT_INBOUND_GROUP_SESSION);
             }
@@ -137,24 +149,24 @@ public class OlmInboundGroupSession extends CommonSerializeUtils implements Seri
      * Decrypt the message passed in parameter.<br>
      * In case of error, null is returned and an error message description is provided in aErrorMsg.
      * @param aEncryptedMsg the message to be decrypted
-     * @param aDecryptIndex_out decrypted message index
-     * @param aErrorMsg error message description
-     * @return the decrypted message if operation succeed, null otherwise.
+     * @return the decrypted message information
+     * @exception DecryptMessageException if there is an error while
      */
-    public String decryptMessage(String aEncryptedMsg, DecryptIndex aDecryptIndex_out, StringBuffer aErrorMsg) {
-        String decryptedMessage = null;
+    public DecryptMessageResult decryptMessage(String aEncryptedMsg) throws DecryptMessageException {
+        DecryptMessageResult result = new DecryptMessageResult();
 
-        // sanity check
-        if(null == aErrorMsg) {
-            Log.e(LOG_TAG,"## decryptMessage(): invalid parameter - aErrorMsg=null");
-        } else {
-            aErrorMsg.setLength(0);
-            decryptedMessage = decryptMessageJni(aEncryptedMsg, aDecryptIndex_out, aErrorMsg, OlmManager.ENABLE_STRING_UTF8_SPECIFIC_CONVERSION);
+        StringBuffer errorMsg = new StringBuffer();
+        result.mDecryptedMessage = decryptMessageJni(aEncryptedMsg, result, errorMsg);
+
+        // check if there is an error while decrypting
+        if (0 != errorMsg.length()) {
+            throw new DecryptMessageException(errorMsg.toString());
         }
-        return decryptedMessage;
+
+        return result;
     }
-    private native String decryptMessageJni(String aEncryptedMsg, DecryptIndex aDecryptIndex_out, StringBuffer aErrorMsg, boolean aIsUtf8ConversionRequired);
 
+    private native String decryptMessageJni(String aEncryptedMsg, DecryptMessageResult aDecryptMessageResult, StringBuffer aErrorMsg);
 
     /**
      * Kick off the serialization mechanism.
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmManager.java b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmManager.java
index 57170c4..1605392 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmManager.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmManager.java
@@ -26,17 +26,11 @@ import android.util.Log;
 public class OlmManager {
     private static final String LOG_TAG = "OlmManager";
     private static final String SDK_OLM_VERSION = "V0.1.0_1";
-    /** specific flag to enable UTF-8 specific conversion for pre Marshmallow(23) android versions.<br>
-     * <a href="https://github.com/eclipsesource/J2V8/issues/142">NDK NewStringUTF() UTF8 issue</a>
-     **/
-    public static boolean ENABLE_STRING_UTF8_SPECIFIC_CONVERSION;
 
     /**
      * Constructor.
-     * @param aIsUtf8SpecificConversionEnabled true to enable JNI specific UTF-8 conversion, false otherwie
      */
-    public OlmManager(boolean aIsUtf8SpecificConversionEnabled) {
-        ENABLE_STRING_UTF8_SPECIFIC_CONVERSION = aIsUtf8SpecificConversionEnabled;
+    public OlmManager() {
     }
 
     static {
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmSession.java b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmSession.java
index 23b2091..faf092e 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmSession.java
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/java/org/matrix/olm/OlmSession.java
@@ -351,10 +351,10 @@ public class OlmSession extends CommonSerializeUtils implements Serializable {
      * @return the decrypted message if operation succeed, null otherwise
      */
     public String decryptMessage(OlmMessage aEncryptedMsg) {
-        return decryptMessageJni(aEncryptedMsg, OlmManager.ENABLE_STRING_UTF8_SPECIFIC_CONVERSION);
+        return decryptMessageJni(aEncryptedMsg);
     }
 
-    private native String decryptMessageJni(OlmMessage aEncryptedMsg, boolean aIsUtf8ConversionRequired);
+    private native String decryptMessageJni(OlmMessage aEncryptedMsg);
 
     /**
      * Return true the object resources have been released.<br>
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.cpp b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.cpp
index 535fd48..8a56a12 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.cpp
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.cpp
@@ -183,7 +183,7 @@ JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(sessionIdentifierJni)(JNIEn
 }
 
 
-JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jstring aEncryptedMsg, jobject aDecryptIndex, jobject aErrorMsg, jboolean aIsUtf8ConversionRequired)
+JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jstring aEncryptedMsg, jobject aDecryptionResult, jobject aErrorMsg)
 {
     jstring decryptedMsgRetValue = 0;
     OlmInboundGroupSession *sessionPtr = NULL;
@@ -204,7 +204,7 @@ JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *
     {
         LOGE(" ## decryptMessageJni(): failure - invalid encrypted message");
     }
-    else if (!aDecryptIndex)
+    else if (!aDecryptionResult)
     {
         LOGE(" ## decryptMessageJni(): failure - invalid index object");
     }
@@ -224,7 +224,7 @@ JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *
     {
         LOGE(" ## decryptMessageJni(): failure - encrypted message JNI allocation OOM");
     }
-    else if (!(indexObjJClass = env->GetObjectClass(aDecryptIndex)))
+    else if (!(indexObjJClass = env->GetObjectClass(aDecryptionResult)))
     {
         LOGE("## decryptMessageJni(): failure - unable to get index class");
     }
@@ -296,28 +296,18 @@ JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *
                 else
                 {
                     // update index
-                    env->SetLongField(aDecryptIndex, indexMsgFieldId, (jlong)messageIndex);
+                    env->SetLongField(aDecryptionResult, indexMsgFieldId, (jlong)messageIndex);
 
-                    // UTF-8 conversion workaround for issue on Android versions older than Marshmallow (23)
-                    if (aIsUtf8ConversionRequired)
+                    // convert to utf8
+                    decryptedMsgRetValue = javaCStringToUtf8(env, plainTextMsgPtr, plaintextLength);
+
+                    if (!decryptedMsgRetValue)
                     {
-                        decryptedMsgRetValue = javaCStringToUtf8(env, plainTextMsgPtr, plaintextLength);
-                        if(0 == decryptedMsgRetValue)
-                        {
-                            LOGE(" ## decryptMessageJni(): UTF-8 Conversion failure - javaCStringToUtf8() returns null");
-                        }
-                        else
-                        {
-                            LOGD(" ## decryptMessageJni(): UTF-8 Conversion - decrypted returnedLg=%lu OK",static_cast<long unsigned int>(plaintextLength));
-                        }
+                        LOGE(" ## decryptMessageJni(): UTF-8 Conversion failure - javaCStringToUtf8() returns null");
                     }
                     else
                     {
-                        // update decrypted buffer size
-                        plainTextMsgPtr[plaintextLength] = static_cast<char>('\0');
-
-                        LOGD(" ## decryptMessageJni(): decrypted returnedLg=%lu plainTextMsgPtr=%s",static_cast<long unsigned int>(plaintextLength), (char*)plainTextMsgPtr);
-                        decryptedMsgRetValue = env->NewStringUTF((const char*)plainTextMsgPtr);
+                        LOGD(" ## decryptMessageJni(): UTF-8 Conversion - decrypted returnedLg=%lu OK",static_cast<long unsigned int>(plaintextLength));
                     }
                 }
 
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.h b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.h
index 132af43..7060df4 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.h
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_inbound_group_session.h
@@ -34,7 +34,7 @@ JNIEXPORT jlong OLM_INBOUND_GROUP_SESSION_FUNC_DEF(createNewSessionJni)(JNIEnv *
 
 JNIEXPORT jint OLM_INBOUND_GROUP_SESSION_FUNC_DEF(initInboundGroupSessionWithSessionKeyJni)(JNIEnv *env, jobject thiz, jstring aSessionKey);
 JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(sessionIdentifierJni)(JNIEnv *env, jobject thiz);
-JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jstring aEncryptedMsg, jobject aDecryptIndex, jobject aErrorMsg, jboolean aIsUtf8ConversionRequired);
+JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jstring aEncryptedMsg, jobject aDecryptIndex, jobject aErrorMsg);
 
 // serialization
 JNIEXPORT jstring OLM_INBOUND_GROUP_SESSION_FUNC_DEF(serializeDataWithKeyJni)(JNIEnv *env, jobject thiz, jstring aKey, jobject aErrorMsg);
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.cpp b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.cpp
index 28edae1..0797ae6 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.cpp
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.cpp
@@ -580,7 +580,7 @@ JNIEXPORT jint OLM_SESSION_FUNC_DEF(encryptMessageJni)(JNIEnv *env, jobject thiz
  * @param aEncryptedMsg message to decrypt
  * @return decrypted message if operation succeed, null otherwise
  */
-JNIEXPORT jstring OLM_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jobject aEncryptedMsg, jboolean aIsUtf8ConversionRequired)
+JNIEXPORT jstring OLM_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jobject aEncryptedMsg)
 {
     jstring decryptedMsgRetValue = 0;
     jclass encryptedMsgJClass = 0;
@@ -668,26 +668,15 @@ JNIEXPORT jstring OLM_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject t
             }
             else
             {
-                // UTF-8 conversion workaround for issue on Android versions older than Marshmallow (23)
-                if (aIsUtf8ConversionRequired)
+                decryptedMsgRetValue = javaCStringToUtf8(env, plainTextMsgPtr, plaintextLength);
+
+                if (!decryptedMsgRetValue)
                 {
-                    decryptedMsgRetValue = javaCStringToUtf8(env, plainTextMsgPtr, plaintextLength);
-                    if(0 == decryptedMsgRetValue)
-                    {
-                        LOGE(" ## decryptMessageJni(): UTF-8 Conversion failure - javaCStringToUtf8() returns null");
-                    }
-                    else
-                    {
-                        LOGD(" ## decryptMessageJni(): UTF-8 Conversion - decrypted returnedLg=%lu OK",static_cast<long unsigned int>(plaintextLength));
-                    }
+                    LOGE(" ## decryptMessageJni(): UTF-8 Conversion failure - javaCStringToUtf8() returns null");
                 }
                 else
                 {
-                    // update decrypted buffer size
-                    plainTextMsgPtr[plaintextLength] = static_cast<char>('\0');
-
-                    LOGD("## decryptMessageJni(): decrypted returnedLg=%lu plainTextMsgPtr=%s",static_cast<long unsigned int>(plaintextLength), (char*)(plainTextMsgPtr));
-                    decryptedMsgRetValue = env->NewStringUTF((const char*)(plainTextMsgPtr));
+                    LOGD(" ## decryptMessageJni(): UTF-8 Conversion - decrypted returnedLg=%lu OK",static_cast<long unsigned int>(plaintextLength));
                 }
             }
         }
diff --git a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.h b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.h
index a43ce3a..22005d9 100644
--- a/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.h
+++ b/java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.h
@@ -45,7 +45,7 @@ JNIEXPORT jint OLM_SESSION_FUNC_DEF(matchesInboundSessionFromIdKeyJni)(JNIEnv *e
 
 // encrypt/decrypt
 JNIEXPORT jint OLM_SESSION_FUNC_DEF(encryptMessageJni)(JNIEnv *env, jobject thiz, jstring aClearMsg, jobject aEncryptedMsg);
-JNIEXPORT jstring OLM_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jobject aEncryptedMsg, jboolean aIsUtf8ConversionRequired);
+JNIEXPORT jstring OLM_SESSION_FUNC_DEF(decryptMessageJni)(JNIEnv *env, jobject thiz, jobject aEncryptedMsg);
 
 JNIEXPORT jstring OLM_SESSION_FUNC_DEF(getSessionIdentifierJni)(JNIEnv *env, jobject thiz);