olm/android/olm-sdk/src/main/jni/olm_pk.cpp

711 lines
23 KiB
C++

/*
* Copyright 2018 New Vector Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "olm_pk.h"
#include "olm/olm.h"
using namespace AndroidOlmSdk;
OlmPkEncryption * initializePkEncryptionMemory()
{
size_t encryptionSize = olm_pk_encryption_size();
OlmPkEncryption *encryptionPtr = (OlmPkEncryption *)malloc(encryptionSize);
if (encryptionPtr)
{
// init encryption object
encryptionPtr = olm_pk_encryption(encryptionPtr);
LOGD(
"## initializePkEncryptionMemory(): success - OLM encryption size=%lu",
static_cast<long unsigned int>(encryptionSize)
);
}
else
{
LOGE("## initializePkEncryptionMemory(): failure - OOM");
}
return encryptionPtr;
}
JNIEXPORT jlong OLM_PK_ENCRYPTION_FUNC_DEF(createNewPkEncryptionJni)(JNIEnv *env, jobject thiz)
{
const char* errorMessage = NULL;
OlmPkEncryption *encryptionPtr = initializePkEncryptionMemory();
// init encryption memory allocation
if (!encryptionPtr)
{
LOGE("## createNewPkEncryptionJni(): failure - init encryption OOM");
errorMessage = "init encryption OOM";
}
else
{
LOGD("## createNewPkEncryptionJni(): success - OLM encryption created");
LOGD(
"## createNewPkEncryptionJni(): encryptionPtr=%p (jlong)(intptr_t)encryptionPtr=%lld",
encryptionPtr, (jlong)(intptr_t)encryptionPtr
);
}
if (errorMessage)
{
// release the allocated data
if (encryptionPtr)
{
olm_clear_pk_encryption(encryptionPtr);
free(encryptionPtr);
}
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return (jlong)(intptr_t)encryptionPtr;
}
JNIEXPORT void OLM_PK_ENCRYPTION_FUNC_DEF(releasePkEncryptionJni)(JNIEnv *env, jobject thiz)
{
LOGD("## releasePkEncryptionJni(): IN");
OlmPkEncryption* encryptionPtr = getPkEncryptionInstanceId(env, thiz);
if (!encryptionPtr)
{
LOGE(" ## releasePkEncryptionJni(): failure - invalid Encryption ptr=NULL");
}
else
{
LOGD(" ## releasePkEncryptionJni(): encryptionPtr=%p", encryptionPtr);
olm_clear_pk_encryption(encryptionPtr);
LOGD(" ## releasePkEncryptionJni(): IN");
// even if free(NULL) does not crash, logs are performed for debug
// purpose
free(encryptionPtr);
LOGD(" ## releasePkEncryptionJni(): OUT");
}
}
JNIEXPORT void OLM_PK_ENCRYPTION_FUNC_DEF(setRecipientKeyJni)(
JNIEnv *env, jobject thiz, jbyteArray aKeyBuffer
) {
const char *errorMessage = NULL;
jbyte *keyPtr = NULL;
OlmPkEncryption *encryptionPtr = getPkEncryptionInstanceId(env, thiz);
if (!encryptionPtr)
{
LOGE(" ## pkSetRecipientKeyJni(): failure - invalid Encryption ptr=NULL");
}
else if (!aKeyBuffer)
{
LOGE(" ## pkSetRecipientKeyJni(): failure - invalid key");
errorMessage = "invalid key";
}
else if (!(keyPtr = env->GetByteArrayElements(aKeyBuffer, 0)))
{
LOGE(" ## pkSetRecipientKeyJni(): failure - key JNI allocation OOM");
errorMessage = "key JNI allocation OOM";
}
else
{
if (olm_pk_encryption_set_recipient_key(encryptionPtr, keyPtr, (size_t)env->GetArrayLength(aKeyBuffer)) == olm_error())
{
errorMessage = olm_pk_encryption_last_error(encryptionPtr);
LOGE(
" ## pkSetRecipientKeyJni(): failure - olm_pk_encryption_set_recipient_key Msg=%s",
errorMessage
);
}
}
if (keyPtr)
{
env->ReleaseByteArrayElements(aKeyBuffer, keyPtr, JNI_ABORT);
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
}
JNIEXPORT jbyteArray OLM_PK_ENCRYPTION_FUNC_DEF(encryptJni)(
JNIEnv *env, jobject thiz, jbyteArray aPlaintextBuffer, jobject aEncryptedMsg
) {
jbyteArray encryptedMsgRet = 0;
const char* errorMessage = NULL;
jbyte *plaintextPtr = NULL;
jboolean plaintextIsCopied = JNI_FALSE;
OlmPkEncryption *encryptionPtr = getPkEncryptionInstanceId(env, thiz);
jclass encryptedMsgJClass = 0;
jfieldID macFieldId;
jfieldID ephemeralFieldId;
if (!encryptionPtr)
{
LOGE(" ## pkEncryptJni(): failure - invalid Encryption ptr=NULL");
}
else if (!aPlaintextBuffer)
{
LOGE(" ## pkEncryptJni(): failure - invalid clear message");
errorMessage = "invalid clear message";
}
else if (!(plaintextPtr = env->GetByteArrayElements(aPlaintextBuffer, &plaintextIsCopied)))
{
LOGE(" ## pkEncryptJni(): failure - plaintext JNI allocation OOM");
errorMessage = "plaintext JNI allocation OOM";
}
else if (!(encryptedMsgJClass = env->GetObjectClass(aEncryptedMsg)))
{
LOGE(" ## pkEncryptJni(): failure - unable to get encrypted message class");
errorMessage = "unable to get encrypted message class";
}
else if (!(macFieldId = env->GetFieldID(encryptedMsgJClass, "mMac", "Ljava/lang/String;")))
{
LOGE("## pkEncryptJni(): failure - unable to get MAC field");
errorMessage = "unable to get MAC field";
}
else if (!(ephemeralFieldId = env->GetFieldID(encryptedMsgJClass, "mEphemeralKey", "Ljava/lang/String;")))
{
LOGE("## pkEncryptJni(): failure - unable to get ephemeral key field");
errorMessage = "unable to get ephemeral key field";
}
else
{
size_t plaintextLength = (size_t)env->GetArrayLength(aPlaintextBuffer);
size_t ciphertextLength = olm_pk_ciphertext_length(encryptionPtr, plaintextLength);
size_t macLength = olm_pk_mac_length(encryptionPtr);
size_t ephemeralLength = olm_pk_key_length();
uint8_t *ciphertextPtr = NULL, *macPtr = NULL, *ephemeralPtr = NULL;
size_t randomLength = olm_pk_encrypt_random_length(encryptionPtr);
uint8_t *randomBuffPtr = NULL;
LOGD("## pkEncryptJni(): randomLength=%lu",static_cast<long unsigned int>(randomLength));
if (!(ciphertextPtr = (uint8_t*)malloc(ciphertextLength)))
{
LOGE("## pkEncryptJni(): failure - ciphertext JNI allocation OOM");
errorMessage = "ciphertext JNI allocation OOM";
}
else if (!(macPtr = (uint8_t*)malloc(macLength + 1)))
{
LOGE("## pkEncryptJni(): failure - MAC JNI allocation OOM");
errorMessage = "MAC JNI allocation OOM";
}
else if (!(ephemeralPtr = (uint8_t*)malloc(ephemeralLength + 1)))
{
LOGE("## pkEncryptJni(): failure: ephemeral key JNI allocation OOM");
errorMessage = "ephemeral JNI allocation OOM";
}
else if (!setRandomInBuffer(env, &randomBuffPtr, randomLength))
{
LOGE("## pkEncryptJni(): failure - random buffer init");
errorMessage = "random buffer init";
}
else
{
macPtr[macLength] = '\0';
ephemeralPtr[ephemeralLength] = '\0';
size_t returnValue = olm_pk_encrypt(
encryptionPtr,
plaintextPtr, plaintextLength,
ciphertextPtr, ciphertextLength,
macPtr, macLength,
ephemeralPtr, ephemeralLength,
randomBuffPtr, randomLength
);
if (returnValue == olm_error())
{
errorMessage = olm_pk_encryption_last_error(encryptionPtr);
LOGE("## pkEncryptJni(): failure - olm_pk_encrypt Msg=%s", errorMessage);
}
else
{
encryptedMsgRet = env->NewByteArray(ciphertextLength);
env->SetByteArrayRegion(
encryptedMsgRet, 0, ciphertextLength, (jbyte*)ciphertextPtr
);
jstring macStr = env->NewStringUTF((char*)macPtr);
env->SetObjectField(aEncryptedMsg, macFieldId, macStr);
jstring ephemeralStr = env->NewStringUTF((char*)ephemeralPtr);
env->SetObjectField(aEncryptedMsg, ephemeralFieldId, ephemeralStr);
}
}
if (randomBuffPtr)
{
memset(randomBuffPtr, 0, randomLength);
free(randomBuffPtr);
}
if (ephemeralPtr)
{
free(ephemeralPtr);
}
if (macPtr)
{
free(macPtr);
}
if (ciphertextPtr)
{
free(ciphertextPtr);
}
}
if (plaintextPtr)
{
if (plaintextIsCopied)
{
memset(plaintextPtr, 0, (size_t)env->GetArrayLength(aPlaintextBuffer));
}
env->ReleaseByteArrayElements(aPlaintextBuffer, plaintextPtr, JNI_ABORT);
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return encryptedMsgRet;
}
OlmPkDecryption * initializePkDecryptionMemory()
{
size_t decryptionSize = olm_pk_decryption_size();
OlmPkDecryption *decryptionPtr = (OlmPkDecryption *)malloc(decryptionSize);
if (decryptionPtr)
{
// init decryption object
decryptionPtr = olm_pk_decryption(decryptionPtr);
LOGD(
"## initializePkDecryptionMemory(): success - OLM decryption size=%lu",
static_cast<long unsigned int>(decryptionSize)
);
}
else
{
LOGE("## initializePkDecryptionMemory(): failure - OOM");
}
return decryptionPtr;
}
JNIEXPORT jlong OLM_PK_DECRYPTION_FUNC_DEF(createNewPkDecryptionJni)(JNIEnv *env, jobject thiz)
{
const char* errorMessage = NULL;
OlmPkDecryption *decryptionPtr = initializePkDecryptionMemory();
// init encryption memory allocation
if (!decryptionPtr)
{
LOGE("## createNewPkDecryptionJni(): failure - init decryption OOM");
errorMessage = "init decryption OOM";
}
else
{
LOGD("## createNewPkDecryptionJni(): success - OLM decryption created");
LOGD(
"## createNewPkDecryptionJni(): decryptionPtr=%p (jlong)(intptr_t)decryptionPtr=%lld",
decryptionPtr, (jlong)(intptr_t)decryptionPtr
);
}
if (errorMessage)
{
// release the allocated data
if (decryptionPtr)
{
olm_clear_pk_decryption(decryptionPtr);
free(decryptionPtr);
}
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return (jlong)(intptr_t)decryptionPtr;
}
JNIEXPORT void OLM_PK_DECRYPTION_FUNC_DEF(releasePkDecryptionJni)(JNIEnv *env, jobject thiz)
{
LOGD("## releasePkDecryptionJni(): IN");
OlmPkDecryption* decryptionPtr = getPkDecryptionInstanceId(env, thiz);
if (!decryptionPtr)
{
LOGE(" ## releasePkDecryptionJni(): failure - invalid Decryption ptr=NULL");
}
else
{
LOGD(" ## releasePkDecryptionJni(): decryptionPtr=%p", encryptionPtr);
olm_clear_pk_decryption(decryptionPtr);
LOGD(" ## releasePkDecryptionJni(): IN");
// even if free(NULL) does not crash, logs are performed for debug
// purpose
free(decryptionPtr);
LOGD(" ## releasePkDecryptionJni(): OUT");
}
}
JNIEXPORT jbyteArray OLM_PK_DECRYPTION_FUNC_DEF(setPrivateKeyJni)(JNIEnv *env, jobject thiz, jbyteArray key)
{
jbyteArray publicKeyRet = 0;
jbyte *keyPtr = NULL;
jboolean keyWasCopied = JNI_FALSE;
const char* errorMessage = NULL;
OlmPkDecryption* decryptionPtr = getPkDecryptionInstanceId(env, thiz);
if (!decryptionPtr)
{
LOGE(" ## pkSetPrivateKeyJni(): failure - invalid Decryption ptr=NULL");
}
else if (!key)
{
LOGE(" ## pkSetPrivateKeyJni(): failure - invalid key");
errorMessage = "invalid key";
}
else if (!(keyPtr = env->GetByteArrayElements(key, &keyWasCopied)))
{
LOGE(" ## pkSetPrivateKeyJni(): failure - key JNI allocation OOM");
errorMessage = "key JNI allocation OOM";
}
else
{
size_t publicKeyLength = olm_pk_key_length();
uint8_t *publicKeyPtr = NULL;
size_t keyLength = (size_t)env->GetArrayLength(key);
if (!(publicKeyPtr = (uint8_t*)malloc(publicKeyLength)))
{
LOGE("## pkSetPrivateKeyJni(): failure - public key JNI allocation OOM");
errorMessage = "public key JNI allocation OOM";
}
else
{
size_t returnValue = olm_pk_key_from_private(
decryptionPtr,
publicKeyPtr, publicKeyLength,
keyPtr, keyLength
);
if (returnValue == olm_error())
{
errorMessage = olm_pk_decryption_last_error(decryptionPtr);
LOGE(" ## pkSetPrivateKeyJni(): failure - olm_pk_key_from_private Msg=%s", errorMessage);
}
else
{
publicKeyRet = env->NewByteArray(publicKeyLength);
env->SetByteArrayRegion(
publicKeyRet, 0, publicKeyLength, (jbyte*)publicKeyPtr
);
}
}
}
if (keyPtr)
{
if (keyWasCopied)
{
memset(keyPtr, 0, (size_t)env->GetArrayLength(key));
}
env->ReleaseByteArrayElements(key, keyPtr, JNI_ABORT);
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return publicKeyRet;
}
JNIEXPORT jbyteArray OLM_PK_DECRYPTION_FUNC_DEF(generateKeyJni)(JNIEnv *env, jobject thiz)
{
size_t randomLength = olm_pk_private_key_length();
uint8_t *randomBuffPtr = NULL;
jbyteArray publicKeyRet = 0;
uint8_t *publicKeyPtr = NULL;
size_t publicKeyLength = olm_pk_key_length();
const char* errorMessage = NULL;
OlmPkDecryption *decryptionPtr = getPkDecryptionInstanceId(env, thiz);
if (!decryptionPtr)
{
LOGE(" ## pkGenerateKeyJni(): failure - invalid Decryption ptr=NULL");
errorMessage = "invalid Decryption ptr=NULL";
}
else if (!setRandomInBuffer(env, &randomBuffPtr, randomLength))
{
LOGE("## pkGenerateKeyJni(): failure - random buffer init");
errorMessage = "random buffer init";
}
else if (!(publicKeyPtr = static_cast<uint8_t*>(malloc(publicKeyLength))))
{
LOGE("## pkGenerateKeyJni(): failure - public key allocation OOM");
errorMessage = "public key allocation OOM";
}
else
{
if (olm_pk_key_from_private(decryptionPtr, publicKeyPtr, publicKeyLength, randomBuffPtr, randomLength) == olm_error())
{
errorMessage = olm_pk_decryption_last_error(decryptionPtr);
LOGE("## pkGenerateKeyJni(): failure - olm_pk_generate_key Msg=%s", errorMessage);
}
else
{
publicKeyRet = env->NewByteArray(publicKeyLength);
env->SetByteArrayRegion(publicKeyRet, 0, publicKeyLength, (jbyte*)publicKeyPtr);
LOGD("## pkGenerateKeyJni(): public key generated");
}
}
if (randomBuffPtr)
{
memset(randomBuffPtr, 0, randomLength);
free(randomBuffPtr);
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return publicKeyRet;
}
JNIEXPORT jbyteArray OLM_PK_DECRYPTION_FUNC_DEF(privateKeyJni)(JNIEnv *env, jobject thiz)
{
jbyteArray privateKeyRet = 0;
const char* errorMessage = NULL;
OlmPkDecryption* decryptionPtr = getPkDecryptionInstanceId(env, thiz);
if (!decryptionPtr)
{
LOGE(" ## pkPrivateKeyJni(): failure - invalid Decryption ptr=NULL");
}
else
{
size_t privateKeyLength = olm_pk_private_key_length();
uint8_t *privateKeyPtr = NULL;
if (!(privateKeyPtr = (uint8_t*)malloc(privateKeyLength)))
{
LOGE("## pkPrivateKeyJni(): failure - private key JNI allocation OOM");
errorMessage = "private key JNI allocation OOM";
}
else
{
size_t returnValue = olm_pk_get_private_key(
decryptionPtr,
privateKeyPtr, privateKeyLength
);
if (returnValue == olm_error())
{
errorMessage = olm_pk_decryption_last_error(decryptionPtr);
LOGE(" ## pkPrivateKeyJni(): failure - olm_pk_get_private_key Msg=%s", errorMessage);
}
else
{
privateKeyRet = env->NewByteArray(privateKeyLength);
env->SetByteArrayRegion(
privateKeyRet, 0, privateKeyLength, (jbyte*)privateKeyPtr
);
memset(privateKeyPtr, 0, privateKeyLength);
}
}
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return privateKeyRet;
}
JNIEXPORT jbyteArray OLM_PK_DECRYPTION_FUNC_DEF(decryptJni)(
JNIEnv *env, jobject thiz, jobject aEncryptedMsg
) {
const char* errorMessage = NULL;
OlmPkDecryption *decryptionPtr = getPkDecryptionInstanceId(env, thiz);
jclass encryptedMsgJClass = 0;
jstring ciphertextJstring = 0;
jstring macJstring = 0;
jstring ephemeralKeyJstring = 0;
jfieldID ciphertextFieldId;
jfieldID macFieldId;
jfieldID ephemeralKeyFieldId;
const char *ciphertextPtr = NULL;
const char *macPtr = NULL;
const char *ephemeralKeyPtr = NULL;
jbyteArray decryptedMsgRet = 0;
if (!decryptionPtr)
{
LOGE(" ## pkDecryptJni(): failure - invalid Decryption ptr=NULL");
errorMessage = "invalid Decryption ptr=NULL";
}
else if (!aEncryptedMsg)
{
LOGE(" ## pkDecryptJni(): failure - invalid encrypted message");
errorMessage = "invalid encrypted message";
}
else if (!(encryptedMsgJClass = env->GetObjectClass(aEncryptedMsg)))
{
LOGE("## pkDecryptJni(): failure - unable to get encrypted message class");
errorMessage = "unable to get encrypted message class";
}
else if (!(ciphertextFieldId = env->GetFieldID(encryptedMsgJClass,"mCipherText","Ljava/lang/String;")))
{
LOGE("## pkDecryptJni(): failure - unable to get message field");
errorMessage = "unable to get message field";
}
else if (!(ciphertextJstring = (jstring)env->GetObjectField(aEncryptedMsg, ciphertextFieldId)))
{
LOGE("## pkDecryptJni(): failure - no ciphertext");
errorMessage = "no ciphertext";
}
else if (!(ciphertextPtr = env->GetStringUTFChars(ciphertextJstring, 0)))
{
LOGE("## pkDecryptJni(): failure - ciphertext JNI allocation OOM");
errorMessage = "ciphertext JNI allocation OOM";
}
else if (!(ciphertextJstring = (jstring)env->GetObjectField(aEncryptedMsg, ciphertextFieldId)))
{
LOGE("## pkDecryptJni(): failure - no ciphertext");
errorMessage = "no ciphertext";
}
else if (!(ciphertextPtr = env->GetStringUTFChars(ciphertextJstring, 0)))
{
LOGE("## decryptMessageJni(): failure - ciphertext JNI allocation OOM");
errorMessage = "ciphertext JNI allocation OOM";
}
else if (!(macFieldId = env->GetFieldID(encryptedMsgJClass,"mMac","Ljava/lang/String;")))
{
LOGE("## pkDecryptJni(): failure - unable to get MAC field");
errorMessage = "unable to get MAC field";
}
else if (!(macJstring = (jstring)env->GetObjectField(aEncryptedMsg, macFieldId)))
{
LOGE("## pkDecryptJni(): failure - no MAC");
errorMessage = "no MAC";
}
else if (!(macPtr = env->GetStringUTFChars(macJstring, 0)))
{
LOGE("## pkDecryptJni(): failure - MAC JNI allocation OOM");
errorMessage = "ciphertext JNI allocation OOM";
}
else if (!(ephemeralKeyFieldId = env->GetFieldID(encryptedMsgJClass,"mEphemeralKey","Ljava/lang/String;")))
{
LOGE("## pkDecryptJni(): failure - unable to get ephemeral key field");
errorMessage = "unable to get ephemeral key field";
}
else if (!(ephemeralKeyJstring = (jstring)env->GetObjectField(aEncryptedMsg, ephemeralKeyFieldId)))
{
LOGE("## pkDecryptJni(): failure - no ephemeral key");
errorMessage = "no ephemeral key";
}
else if (!(ephemeralKeyPtr = env->GetStringUTFChars(ephemeralKeyJstring, 0)))
{
LOGE("## pkDecryptJni(): failure - ephemeral key JNI allocation OOM");
errorMessage = "ephemeral key JNI allocation OOM";
}
else
{
size_t maxPlaintextLength = olm_pk_max_plaintext_length(
decryptionPtr,
(size_t)env->GetStringUTFLength(ciphertextJstring)
);
uint8_t *plaintextPtr = NULL;
uint8_t *tempCiphertextPtr = NULL;
size_t ciphertextLength = (size_t)env->GetStringUTFLength(ciphertextJstring);
if (!(plaintextPtr = (uint8_t*)malloc(maxPlaintextLength)))
{
LOGE("## pkDecryptJni(): failure - plaintext JNI allocation OOM");
errorMessage = "plaintext JNI allocation OOM";
}
else if (!(tempCiphertextPtr = (uint8_t*)malloc(ciphertextLength)))
{
LOGE("## pkDecryptJni(): failure - temp ciphertext JNI allocation OOM");
}
else
{
memcpy(tempCiphertextPtr, ciphertextPtr, ciphertextLength);
size_t plaintextLength = olm_pk_decrypt(
decryptionPtr,
ephemeralKeyPtr, (size_t)env->GetStringUTFLength(ephemeralKeyJstring),
macPtr, (size_t)env->GetStringUTFLength(macJstring),
tempCiphertextPtr, ciphertextLength,
plaintextPtr, maxPlaintextLength
);
if (plaintextLength == olm_error())
{
errorMessage = olm_pk_decryption_last_error(decryptionPtr);
LOGE("## pkDecryptJni(): failure - olm_pk_decrypt Msg=%s", errorMessage);
}
else
{
decryptedMsgRet = env->NewByteArray(plaintextLength);
env->SetByteArrayRegion(decryptedMsgRet, 0, plaintextLength, (jbyte*)plaintextPtr);
LOGD(
"## pkDecryptJni(): success returnedLg=%lu OK",
static_cast<long unsigned int>(plaintextLength)
);
}
}
if (tempCiphertextPtr)
{
free(tempCiphertextPtr);
}
if (plaintextPtr)
{
memset(plaintextPtr, 0, maxPlaintextLength);
free(plaintextPtr);
}
}
if (ciphertextPtr)
{
env->ReleaseStringUTFChars(ciphertextJstring, ciphertextPtr);
}
if (macPtr)
{
env->ReleaseStringUTFChars(macJstring, macPtr);
}
if (ephemeralKeyPtr)
{
env->ReleaseStringUTFChars(ephemeralKeyJstring, ephemeralKeyPtr);
}
if (errorMessage)
{
env->ThrowNew(env->FindClass("java/lang/Exception"), errorMessage);
}
return decryptedMsgRet;
}