alwentiu / svm

Scope VM: Javascript Virtual Machine

svm

A register-pointer JavaScript virtual machine written in JavaScript.

Usage

Building

Create index.js in the src directory, then run ./build.sh with the repository directory as your current working directory.

Running

Run ./run.sh with the repository directory as your current working directory.

Functionality

• Compile almost any JavaScript source to obfuscated virtual machine code
• Dynamic instruction set, randomized output bytecode
• ES5 compatible output for ES6+ input

Planned Features

Functionality

• Modules, imports, exports
• Templates (w/o Babel)
• Internal async functions
• Spread elements (w/o Babel)
• Do expressions
• With statements
• Decorators
• Directives
• Function generators
• Catch external exceptions internally
• Bundling of client sources pre-compilation
• Conditional sets
• Run minifier more

Obfuscation

• Instruction repackaging, shuffling, modification/generation
• VM internals repackaging
• Metamorphic bytecode -- copy in code, alternate decryptions, etc
• Bytecode scheduler/internal async functions
• Hide instructions via mov and call register
• Replace jz/jnz with add r0 X r0 with X = r0 + !!condition * off
• Replace sub with add r0 X r2 with X = div r1 -1
• Replace eq_typed with eq + typeof
• Internal negation of Numbers
• Compiler-client register mapped shuffling
• Code signing and internal verification
• Tamper detection - block by block - chained
• Code flow graph flattening
• Use register pointing capability
• Internal offset assertions

Performance

• Compile-time hotspotting
• Global value numbering
• Dead code elimination
• Register reduction
• Instructions as arguments
• Track register state across time rather than live scanning only in optfuscator
• Inbuilt profiling

Compatibility

• Remove typed arrays dependency

Architecture

Compiler

The compiler converts JavaScript code into svm assembler. There is no optimization, and this is only intended to convert the semantics of JavaScript to svm assembler.

Optfuscator

The optfuscator, or optimizing obfuscator, optimizes and obfuscates svm assembler (but not svm bytecode).

Assembler

The assembler compiles svm assembler into svm bytecode, and encrypts it. It is planned to output a minimal, obfuscated, and web-compatible client.

Client

The client runs the svm bytecode.