From 393ac8b4bca9db98f297cb4756ef2e79364bf6f0 Mon Sep 17 00:00:00 2001
From: Johannes Huber <johu@gmx.de>
Date: Thu, 17 Mar 2011 14:19:18 +0100
Subject: [PATCH] check for qca provider plugin, fixes #1045

Prevents core from crashing when qca provider plugin is missing.
The plugin is needed at runtime. Can occurres when packagers did
not install it.
---
 src/core/cipher.cpp               | 12 ++++++++++++
 src/core/cipher.h                 |  1 +
 src/core/coreircchannel.cpp       |  3 +++
 src/core/corenetwork.cpp          |  3 +++
 src/core/coreuserinputhandler.cpp |  9 +++++++++
 src/core/ircparser.cpp            |  3 +++
 6 files changed, 31 insertions(+)

diff --git a/src/core/cipher.cpp b/src/core/cipher.cpp
index 195936cb..92b8fad1 100644
--- a/src/core/cipher.cpp
+++ b/src/core/cipher.cpp
@@ -13,6 +13,7 @@
 */
 
 #include "cipher.h"
+#include "logger.h"
 
 
 Cipher::Cipher()
@@ -449,3 +450,14 @@ QByteArray Cipher::b64ToByte(QByteArray text)
   }
   return decoded;
 }
+
+bool Cipher::neededFeaturesAvailable()
+{
+  QCA::Initializer init;
+
+  if (QCA::isSupported("blowfish-ecb") && QCA::isSupported("blowfish-cbc") && QCA::isSupported("dh"))
+    return true;
+
+  qWarning() << "QCA provider plugin not found. It is usually provided by the qca-ossl plugin.";
+  return false;
+}
diff --git a/src/core/cipher.h b/src/core/cipher.h
index b5cf0e0f..33a2bf8c 100644
--- a/src/core/cipher.h
+++ b/src/core/cipher.h
@@ -33,6 +33,7 @@ class Cipher
     QByteArray key() { return m_key; }
     bool setType(const QString &type);
     QString type() { return m_type; }
+    static bool neededFeaturesAvailable();
 
   private:
     //direction is true for encrypt, false for decrypt
diff --git a/src/core/coreircchannel.cpp b/src/core/coreircchannel.cpp
index 85eb333f..02b81b76 100644
--- a/src/core/coreircchannel.cpp
+++ b/src/core/coreircchannel.cpp
@@ -46,6 +46,9 @@ Cipher *CoreIrcChannel::cipher() const {
 }
 
 void CoreIrcChannel::setEncrypted(bool e) {
+  if(!Cipher::neededFeaturesAvailable())
+    return;
+
   if(e) {
     if(topic().isEmpty())
       return;
diff --git a/src/core/corenetwork.cpp b/src/core/corenetwork.cpp
index 94854990..534199e3 100644
--- a/src/core/corenetwork.cpp
+++ b/src/core/corenetwork.cpp
@@ -275,6 +275,9 @@ Cipher *CoreNetwork::cipher(const QString &target) const {
   if(target.isEmpty())
     return 0;
 
+  if(!Cipher::neededFeaturesAvailable())
+    return 0;
+
   QByteArray key = cipherKey(target);
   if(key.isEmpty())
     return 0;
diff --git a/src/core/coreuserinputhandler.cpp b/src/core/coreuserinputhandler.cpp
index 8292325f..f1654a4d 100644
--- a/src/core/coreuserinputhandler.cpp
+++ b/src/core/coreuserinputhandler.cpp
@@ -164,6 +164,9 @@ void CoreUserInputHandler::handleDelkey(const BufferInfo &bufferInfo, const QStr
   if(!bufferInfo.isValid())
     return;
 
+  if(!Cipher::neededFeaturesAvailable())
+    return;
+
   QStringList parms = msg.split(' ', QString::SkipEmptyParts);
 
   if(parms.isEmpty() && !bufferInfo.bufferName().isEmpty())
@@ -454,6 +457,9 @@ void CoreUserInputHandler::handleSetkey(const BufferInfo &bufferInfo, const QStr
   if(!bufferInfo.isValid())
     return;
 
+  if(!Cipher::neededFeaturesAvailable())
+    return;
+
   QStringList parms = msg.split(' ', QString::SkipEmptyParts);
 
   if(parms.count() == 1 && !bufferInfo.bufferName().isEmpty())
@@ -638,6 +644,9 @@ QByteArray CoreUserInputHandler::encrypt(const QString &target, const QByteArray
   if(message_.isEmpty())
     return message_;
 
+  if(!Cipher::neededFeaturesAvailable())
+    return message_;
+
   Cipher *cipher = network()->cipher(target);
   if(!cipher)
     return message_;
diff --git a/src/core/ircparser.cpp b/src/core/ircparser.cpp
index 7811e05d..b372e351 100644
--- a/src/core/ircparser.cpp
+++ b/src/core/ircparser.cpp
@@ -50,6 +50,9 @@ QByteArray IrcParser::decrypt(Network *network, const QString &bufferName, const
   if(message.isEmpty())
     return message;
 
+  if(!Cipher::neededFeaturesAvailable())
+    return message;
+
   Cipher *cipher = qobject_cast<CoreNetwork *>(network)->cipher(bufferName);
   if(!cipher)
     return message;
-- 
2.20.1