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aws/s2n-tls: An implementation of the TLS/SSL protocols – Repository aws/s2n-tls. Mô tả: An implementation of the TLS/SSL protocols. 4763 stars, 802 forks, ngôn ngữ chính C, cập nhật 2026-09-14.
1. Repository làm gì?
s2n-tls is a C99 implementation of the TLS/SSL protocols that is designed to be simple, small, fast, and with security as a priority. It is released and licensed under the Apache License 2.0.
s2n-tls is short for "signal to noise" and is a nod to the almost magical act of encryption — disguising meaningful signals, like your critical data, as seemingly random noise.
See the s2n-tls build documentation for further guidance on building s2n-tls for your platform.
If you think you might have found a security impacting issue, please follow our Security Notification Process. See our Security Reporting Policy for additional guidance on issues considered in-scope for our threat model.
If you have any questions about submitting PRs, s2n-tls API usage, or something similar, please open an issue.
s2n-tls uses Doxygen to document its public API. The latest s2n-tls documentation can be found on GitHub pages. The Usage Guide explains how different TLS features can be configured and used. s2n-tls Rust bindings docs can be found here.
2. Dữ liệu và cấu trúc đáng chú ý
Documentation for older versions or branches of s2n-tls can be generated locally. To generate the documentation, install doxygen and run doxygen docs/doxygen/Doxyfile. The doxygen documentation can now be found at docs/doxygen/output/html/index.html.
Doxygen installation instructions are available at the Doxygen webpage.
We’ve listed the distributions and platforms under two tiers: Tier 1 platforms are guaranteed to build, run, and pass tests in CI. Tier 2 platforms are guaranteed to build and we'll address issues opened against them, but they aren't currently running in our CI and are not actively reviewed with every commit. If you use a platform not listed below and would like to request (or help!) add it to our CI, please open an issue for discussion.
*Windows is supported through the MSYS2 environment with a MinGW toolchain (UCRT64, MINGW64, and CLANG64). The MSVC toolchain is not supported. On Windows, AWS-LC is the only supported libcrypto. Some POSIX-specific features (such as kTLS) are not available on Windows. See the build documentation for details.
These distribution lists are not exhaustive and missing tooling or a missing supported libcrypto library could prevent a successful build.
The s2n-tls I/O APIs are designed to be intuitive to developers familiar with the widely-used POSIX I/O APIs, and s2n-tls supports blocking, non-blocking, and full-duplex I/O. Additionally there are no locks or mutexes within s2n-tls.
For details on building the s2n-tls library and how to use s2n-tls in an application you are developing, see the Usage Guide.
3. Khả năng ứng dụng và giới hạn
s2n-tls implements SSLv3, TLS1.0, TLS1.1, TLS1.2, and TLS1.3. For encryption, s2n-tls supports 128-bit and 256-bit AES in the CBC and GCM modes, ChaCha20, 3DES, and RC4. For forward secrecy, s2n-tls supports both DHE and ECDHE. s2n-tls also supports the Server Name Indicator (SNI), Application-Layer Protocol Negotiation (ALPN), and Online Certificate Status Protocol (OCSP) TLS extensions. SSLv3, RC4, 3DES, and DHE are each disabled by default for security reasons.
As it can be difficult to keep track of which encryption algorithms and protocols are best to use, s2n-tls features a simple API to use the latest "default" set of preferences. If you prefer to remain on a specific version for backwards compatibility, that is also supported.
Internally s2n-tls takes a systematic approach to data protection and includes several mechanisms designed to improve safety.
s2n-tls's code is structured and written with a focus on reviewability. All s2n-tls code is subject to code review, and we plan to complete security evaluations of s2n-tls on an annual basis.
To date there have been two external code-level reviews of s2n-tls, including one by a commercial security vendor. s2n-tls has also been shared with some trusted members of the broader cryptography, security, and Open Source communities. Any issues discovered are always recorded in the s2n-tls issue tracker.
In addition to code reviews, s2n-tls is subject to regular static analysis, fuzz-testing, and penetration testing. Several penetration tests have occurred, including two by commercial vendors.
s2n-tls includes positive and negative unit tests and end-to-end test cases.
Unit test coverage can be viewed here. Note that this represents unit coverage for a particular build. Since that build won't necessarily support all s2n-tls features, test coverage may be artificially lowered.
s2n-tls encrypts or erases plaintext data as quickly as possible. For example, decrypted data buffers are erased as they are read by the application.
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