Author: Ian Bull

AES (Advanced Encryption Standard) is a symmetric-key encryption algorithm. Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. In this tutorial we will demonstrate how to encrypt plaintext using the OpenSSL command line and decrypt the cipher using the OpenSSL C++ API. The cryptographic keys used for AES are usually fixed-length (for example, 128...

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Code signing and verification is the process of digitally signing executables or scripts to ensure that the software you are executing has not been altered since it was signed. I previously outlined how to perform code signing and verification with OpenSSL, using both the command line and OpenSSL API. While the tutorial explained how to create an RSA KeyPair, it didn't mention anything about protecting the...

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Tabris.js is a cross platform mobile toolkit that enables application developers to target multiple platforms from a single JavaScript code base. Unlike some other cross-platform toolkits, Tabris.js does not rely on WebViews, but instead produces native applications. This is achieved by providing a cross-platform API in JavaScript and linking that API to the platform specific widgets. Additionally, Tabris.js also includes a build service. This service enables our...

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Code signing and verification is the process of digitally signing executables or scripts to ensure that the software you are executing has not been altered since it was signed. Code signing helps protect against corrupt artifacts, process breakdown (accidentally delivering the wrong thing) and even malicious intents. We have recently started implementing code verification in J2V8. Code verification has been implemented in the native code using OpenSSL. Code...

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Mobile software development is hard. Before you can even write your first line of code you must: download, install and configure the IDEs and SDKs, configure the emulators or connect a device to your machine, build the application archives (apks / ipas) and install these archives on your device. With Tabris.js we set out to eliminate most of the technical hurdles users face when developing mobile applications. With...

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I returned home late the other night, and saw this tweet in my timeline: https://twitter.com/marckhouzam/status/761389998788714496 He added a clarifying note that said the '?' was also broken. For those of you who don't know Marc, he is the co-lead of the Eclipse C/C++ Development Tools and all round good guy. I was pretty sure his keyboard wasn't actually broken and he was basically asking: How can you write a...

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Memory management in J2V8 has never been easy. Because J2V8 bridges V8 and Java, three different memory models are in play. Both Java and JavaScript provide a managed memory model with their own GC. JNI / C++ which sits in the middle is completely unmanaged. This leads to a complex situation since both JavaScript and Java will free memory if they think it's unused, but...

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When J2V8 was first released, all callbacks from JavaScript to Java required a registered Java method. That is, all Java methods that you wished to invoke had to be first registered with J2V8. For some applications this was fine, but it made for a complex programming model. Furthermore you could not use anonymous inner classes or Java 8 lambdas. With J2V8 4, this has changed. J2V8...

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Last week I finally published the Node.js bindings for Java. These bindings allow developers to embed the Node.js runtime directly onto the JVM through the Java Native Interface. In March I gave a pre-release presentation at EclipseCon on this work, which was recorded by InfoQ. You can check it out at: https://www.infoq.com/presentations/node4j-nodejs-java. The slides are also available on SlideShare....

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When J2V8 was first released, all Java characters passed between Java and V8 were converted to 8bit C-Style strings. For many applications this was just fine, but if your JavaScript contained 16 bit Unicode characters, then you were hosed. https://twitter.com/waynebeaton/status/757609271496286208 With J2V8 4 this has been fixed. All strings are now referenced as uint16_t in C++. Using the JNI API we were able to get the 2 byte string...

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