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Security

Posts about writing secure software, cryptography, etc.

Posts

The Seedling Sees the Light of Day: Sequoia-PGP Initial Release by Neal H. Walfield, Justus Winter, and Kai Michaelis
On October 16, 2017, we made the first commit to the Sequoia repository. Just over a year and a thousand commits later, Sequoia’s low-level API is nearly feature complete, and is already usable. For instance, a port of the p≡p engine to Sequoia is almost finished, and the code is significantly simpler than the version using the current OpenPGP library. We’ve also made experimental ports of other software that use OpenPGP, and written some new software to further validate the completeness and ergonomics of the API.
Introducing Mundane, a new cryptography library for Rust by Joshua Liebow-Feeser
Mundane is a cryptography library written in Rust and backed by BoringSSL. It aims to be difficult to misuse, ergonomic, and performant (in that order). It was originally created to serve the cryptography needs of Fuchsia, but we’ve decided to split it off as a general-purpose crate.
Merlin: flexible, composable transcripts for zero-knowledge proofs by Henry de Valence
Merlin is a small Rust library that performs the Fiat-Shamir transformation in software, maintaining a STROBE-based transcript of the proof protocol and allowing the prover to commit messages to the transcript and compute challenges bound to all previous messages. It also provides a transcript-based RNG for use by the prover, generalizing “deterministic” and “synthetic” nonces to arbitrarily complex zero-knowledge protocols.
‘orion’ - yet another attempt at pure-Rust cryptography by brycx
orion is another attempt at cryptography implemented in pure Rust. Its main focus is usability. This is in part achieved by providing a thorough documentation of the library. High-level abstractions are also provided, which are an attempt at guiding the users towards safe usage of the lower-level functionality of the library.
How I’ve found vulnerability in a popular Rust crate (and you can too) by Sergey "Shnatsel" Davidoff
I have recently discovered a zero-day vulnerability in a fairly popular and well-designed Rust crate. In this article I’m going to discuss how I did it and why it wasn’t discovered earlier, and introduce a new tool, libdiffuzz, that I’ve created for the job. A recently discovered vulnerability in Rust standard library makes a cameo appearance.
Security advisory for the standard library (str::repeat) by The Rust Core Team
The Rust team was recently notified of a security vulnerability affecting the standard library’s str::repeat function. When passed a large number this function has an integer overflow which can lead to an out of bounds write. If you are not using str::repeat, you are not affected.
Postgres over TLS with postgres and r2d2_postgres by Matthew Mayer's
In this post we’ll go over how to get the postgres crate and r2d2_postgres working with openssl for connection pooling with TLS.
Transparent encryption and decryption in rust with cryptostreams by Mahmoud Al-Qudsi
The rust community has fortunately adopted the OpenSSL bindings as the approach of choice, and the rust-openssl crate makes it easy to both bundle and consume the openssl bindings from rust in a cross-platform manner. What it doesn’t do is make encryption and decryption any easier than OpenSSL itself does.

Enter the cryptostream crate. Released on github and on crates.io under the MIT public license, cryptostream finally provides an easy and transparent way to add encryption and decryption to pipelines involving objects implementing Read or Write, making encryption (or decryption) as easy as creating a new cryptostream object, passing in an existing Read/Write impl, and then reading/writing from/to the cryptostream instead.
How Rust’s standard library was vulnerable for years and nobody noticed by Sergey "Shnatsel" Davidoff
Rust is a new systems programming language that prides itself on memory safety and speed. The gist of it is that if you write code in Rust, it goes as fast as C or C++, but you will not get mysterious intermittent crashes in production or horrific security vulnerabilities, unlike in the latter two.

That is, until you explicitly opt in to that kind of thing. Uh oh.
Software Security is a Programming Languages Issue by Michael Hicks
This is the the last of three posts on the course I regularly teach, CS 330, Organization of Programming Languages. The first two posts covered programming language styles and mathematical concepts. This post covers the last 1/4 of the course, which focuses on software security, and related to that, the programming language Rust.
Xori - Custom disassembly framework by Amanda Rousseau and Rich Seymour
Xori is an automation-ready disassembly and static analysis library that consumes shellcode or PE binaries and provides triage analysis data.
Accelerating Edwards Curve Arithmetic with Parallel Formulas by Henry de Valence
The fastest formulas for elliptic curve operations were published by Hisil, Wong, Carter, and Dawson in their 2008 paper Twisted Edwards Curves Revisited. Their paper also describes a parallel version of their formulas, designed to execute four streams of instructions on four independent processors. Until now, these parallel formulas don’t seem to have been implemented in software. But a closer look reveals that slightly modifying the formulas allows the expensive instructions to be executed in uniform, making a vectorized SIMD implementation possible.

I implemented this strategy in Rust, targeting 256-bit wide AVX2 operations. The resulting implementation performs double-base scalar multiplication faster than other Ed25519 implementations I tested, and is even faster than FourQ without endomorphisms
RustSec Advisory Database by Rust Project Developers
Security advisory database for Rust crates published through https://crates.io.