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setRandomInBuffer uses java.lang.SecureRandom.

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This commit is contained in:
ylecollen 2016-12-21 15:10:54 +01:00
parent bacdc3c539
commit 643165067f
5 changed files with 68 additions and 14 deletions
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4
java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_account.cpp
View file

@ -104,7 +104,7 @@ JNIEXPORT jlong OLM_ACCOUNT_FUNC_DEF(initNewAccountJni)(JNIEnv *env, jobject thi
LOGD("## initNewAccount(): randomSize=%lu", static_cast<long unsigned int>(randomSize));
// allocate random buffer
if((0!=randomSize) && !setRandomInBuffer(&randomBuffPtr, randomSize))
if((0!=randomSize) && !setRandomInBuffer(env, &randomBuffPtr, randomSize))
{
LOGE("## initNewAccount(): failure - random buffer init");
}
@ -234,7 +234,7 @@ JNIEXPORT jint OLM_ACCOUNT_FUNC_DEF(generateOneTimeKeysJni)(JNIEnv *env, jobject
randomLength = olm_account_generate_one_time_keys_random_length(accountPtr, (size_t)aNumberOfKeys);
LOGD("## generateOneTimeKeysJni(): randomLength=%lu", static_cast<long unsigned int>(randomLength));
if((0!=randomLength) && !setRandomInBuffer(&randomBufferPtr, randomLength))
if((0!=randomLength) && !setRandomInBuffer(env, &randomBufferPtr, randomLength))
{
LOGE("## generateOneTimeKeysJni(): failure - random buffer init");
}

2
java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_jni.h
View file

@ -67,7 +67,7 @@ extern "C" {
#endif
// internal helper functions
bool setRandomInBuffer(uint8_t **aBuffer2Ptr, size_t aRandomSize);
bool setRandomInBuffer(JNIEnv *env, uint8_t **aBuffer2Ptr, size_t aRandomSize);
jlong getSessionInstanceId(JNIEnv* aJniEnv, jobject aJavaObject);
jlong getAccountInstanceId(JNIEnv* aJniEnv, jobject aJavaObject);
jlong getInboundGroupSessionInstanceId(JNIEnv* aJniEnv, jobject aJavaObject);

70
java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_jni_helper.cpp
View file

@ -29,10 +29,11 @@ using namespace AndroidOlmSdk;
* @param aRandomSize the number of random values to apply
* @return true if operation succeed, false otherwise
**/
bool setRandomInBuffer(uint8_t **aBuffer2Ptr, size_t aRandomSize)
bool setRandomInBuffer(JNIEnv *env, uint8_t **aBuffer2Ptr, size_t aRandomSize)
{
bool retCode = false;
struct timeval timeValue;
int bufferLen = aRandomSize*sizeof(uint8_t);
if(NULL == aBuffer2Ptr)
{
@ -42,7 +43,7 @@ bool setRandomInBuffer(uint8_t **aBuffer2Ptr, size_t aRandomSize)
{
LOGE("## setRandomInBuffer(): failure - random size=0");
}
else if(NULL == (*aBuffer2Ptr = (uint8_t*)malloc(aRandomSize*sizeof(uint8_t))))
else if(NULL == (*aBuffer2Ptr = (uint8_t*)malloc(bufferLen)))
{
LOGE("## setRandomInBuffer(): failure - alloc mem OOM");
}
@ -50,16 +51,69 @@ bool setRandomInBuffer(uint8_t **aBuffer2Ptr, size_t aRandomSize)
{
LOGD("## setRandomInBuffer(): randomSize=%lu",static_cast<long unsigned int>(aRandomSize));
gettimeofday(&timeValue, NULL);
srand(timeValue.tv_usec); // init seed
bool secureRandomSucceeds = false;
for(size_t i=0;i<aRandomSize;i++)
// clear the buffer
memset(*aBuffer2Ptr, 0, bufferLen);
// use the secureRandom class
jclass cls = env->FindClass("java/security/SecureRandom");
if (cls)
{
(*aBuffer2Ptr)[i] = (uint8_t)(rand()%ACCOUNT_CREATION_RANDOM_MODULO);
// debug purpose
//LOGD("## setRandomInBuffer(): randomBuffPtr[%ld]=%d",i, (*aBuffer2Ptr)[i]);
jobject newObj = 0;
jmethodID constructor = env->GetMethodID(cls, "<init>", "()V");
jmethodID nextByteMethod = env->GetMethodID(cls, "nextBytes", "([B)V");
if (constructor)
{
newObj = env->NewObject(cls, constructor);
jbyteArray tempByteArray = env->NewByteArray(bufferLen);
if (newObj && tempByteArray)
{
env->CallVoidMethod(newObj, nextByteMethod, tempByteArray);
jbyte* buffer = env->GetByteArrayElements(tempByteArray,0);
if (buffer)
{
memcpy(*aBuffer2Ptr, buffer, bufferLen);
secureRandomSucceeds = true;
}
}
if (tempByteArray)
{
env->DeleteLocalRef(tempByteArray);
}
if (newObj)
{
env->DeleteLocalRef(newObj);
}
}
}
if (!secureRandomSucceeds)
{
LOGE("## setRandomInBuffer(): SecureRandom failed, use a fallback");
gettimeofday(&timeValue, NULL);
srand(timeValue.tv_usec); // init seed
for(size_t i=0;i<aRandomSize;i++)
{
(*aBuffer2Ptr)[i] = (uint8_t)(rand()%ACCOUNT_CREATION_RANDOM_MODULO);
}
}
// debug purpose
/*for(int i = 0; i < aRandomSize; i++)
{
LOGD("## setRandomInBuffer(): randomBuffPtr[%ld]=%d",i, (*aBuffer2Ptr)[i]);
}*/
retCode = true;
}
return retCode;

2
java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_outbound_group_session.cpp
View file

@ -102,7 +102,7 @@ JNIEXPORT jint OLM_OUTBOUND_GROUP_SESSION_FUNC_DEF(initOutboundGroupSessionJni)(
// compute random buffer
size_t randomLength = olm_init_outbound_group_session_random_length(sessionPtr);
LOGW(" ## initOutboundGroupSessionJni(): randomLength=%lu",static_cast<long unsigned int>(randomLength));
if((0!=randomLength) && !setRandomInBuffer(&randomBuffPtr, randomLength))
if((0!=randomLength) && !setRandomInBuffer(env, &randomBuffPtr, randomLength))
{
LOGE(" ## initOutboundGroupSessionJni(): failure - random buffer init");
}

4
java/android/OlmLibSdk/olm-sdk/src/main/jni/olm_session.cpp
View file

@ -132,7 +132,7 @@ JNIEXPORT jint OLM_SESSION_FUNC_DEF(initOutboundSessionJni)(JNIEnv *env, jobject
{ // allocate random buffer
size_t randomSize = olm_create_outbound_session_random_length(sessionPtr);
LOGD("## initOutboundSessionJni(): randomSize=%lu",static_cast<long unsigned int>(randomSize));
if((0!=randomSize) && !setRandomInBuffer(&randomBuffPtr, randomSize))
if((0!=randomSize) && !setRandomInBuffer(env, &randomBuffPtr, randomSize))
{
LOGE("## initOutboundSessionJni(): failure - random buffer init");
}
@ -497,7 +497,7 @@ JNIEXPORT jint OLM_SESSION_FUNC_DEF(encryptMessageJni)(JNIEnv *env, jobject thiz
// it just does not need new random data to encrypt a new message
size_t randomLength = olm_encrypt_random_length(sessionPtr);
LOGD("## encryptMessageJni(): randomLength=%lu", static_cast<long unsigned int>(randomLength));
if((0!=randomLength) && !setRandomInBuffer(&randomBuffPtr, randomLength))
if((0!=randomLength) && !setRandomInBuffer(env, &randomBuffPtr, randomLength))
{
LOGE("## encryptMessageJni(): failure - random buffer init");
}