SymCrypt Provider for Rustls

This crate provides integration for using rust-symcrypt cryptographic functionalities with rustls, by implementing the required traits specified by rustls.

Supported Configurations

Operating Environment	Architecture	Dynamic Linking
Windows user mode	AMD64, ARM64	✅
Ubuntu (Tested via WSL)	AMD64, ARM64	✅
Azure Linux 3	AMD64, ARM64	✅
Azure Linux 2	AMD64, ARM64	❌

Dependencies

This crate depends on the symcrypt crate and requires you have the necessary symcrypt binaries for your architecture. Refer to the rust-symcrypt Quick Start Guide to download the required binaries.

Usage

Add rustls-symcrypt to your Cargo.toml: Note: If you wish to enable x25519 or chacha you may add it as a feature at this time.

[dependencies]
rustls = { version = "0.23.0", features = ["ring", "tls12", "std"], default-features = false }
# Disabling aws-lc as it slows down build times and is not needed.
rustls_symcrypt = "0.1.0"
# To enable the chacha feature:
# rustls_symcrypt = {version = "0.1.0", features = ["chacha"]}

Supported Ciphers

Supported cipher suites are listed below, ordered by preference. IE: The default configuration prioritizes TLS13_AES_256_GCM_SHA384 over TLS13_AES_128_GCM_SHA256.

TLS 1.3

TLS13_AES_256_GCM_SHA384
TLS13_AES_128_GCM_SHA256
TLS13_CHACHA20_POLY1305_SHA256 // Enabled with the `chacha` feature

Note: TLS13_CHACHA20_POLY1305_SHA256 is disabled by default. Enable the chacha feature in your Cargo.toml to use this cipher suite.

TLS 1.2

TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 // Enabled with the `chacha` feature
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 // Enabled with the `chacha` feature

Supported Key Exchanges

Key exchanges are listed below, ordered by preference. IE: SECP384R1 is preferred over SECP256R1.

SECP384R1
SECP256R1
X25519 // Enabled with the `x25519` feature

Note: X25519 is disabled by default. To enable, add x25519 feature in your Cargo.toml.

Example Code

The examples directory showcases how to use the rustls-symcrypt provider with rustls for both a client configuration and a server configuration by taking advantage of rustls::ClientConfig::builder_with_provider().