AWS-LC is a general-purpose cryptographic library maintained by the AWS Cryptography team for AWS and their customers. It іs based on code from the Google BoringSSL project and the OpenSSL project.

AWS-LC contains portable C implementations of algorithms needed for TLS and common applications. For performance critical algorithms, optimized assembly versions are included for x86 and ARM.

Fork AWS-LC on GitHub and run the following commands to build AWS-LC with optimizations and debug info, run all tests, and install it:

sudo yum install cmake ninja-build clang perl golang
git clone https://github.com/${YOUR_GITHUB_ACCOUNT_NAME}/aws-lc.git
mkdir aws-lc-build && cd aws-lc-build
cmake -GNinja \
    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
    -DCMAKE_INSTALL_PREFIX=../aws-lc-install \
    ../aws-lc
ninja-build run_tests && ninja-build install
cd ../aws-lc-install/
ls *

See Building.md for more information about required dependencies and build options. If you’re interested in getting involved open an Issue to discuss your plan or talk to us on Gitter. Contributing.md has info for how to specifically make the change and get it reviewed by AWS-LC maintainers. If you just want to use AWS-LC see our existing documentation in the public header files, if you’re moving your application from OpenSSL see Porting_to_AWS-LC.md for more information.

AWS-LC's goal is to maintain a secure libcrypto that is compatible with software and applications used at AWS. AWS-LC also serves as the new home for the AWS Cryptography team to publish open source contributions and enhancements that are submitted to other libcrypto projects.

AWS-LC is compatible with the majority of OpenSSL’s APIs to make it easy to use with existing applications. We’re open to discussing adding missing functionality and understanding your use case in an Issue or on Gitter.

AWS-LC’s libcrypto is a C library and is tested with a variety of C compilers. To build libssl and AWS-LC’s tests you will need a C++ compiler. AWS-LC is tested with:

• GCC 4.8.5 to 8.4
• Clang 7 to 10
• Visual Studio 2015

For a complete list of tested compilers see tests/ci/Readme.md. If you use another compiler and would like to make sure we maintain support, please open an issue to discuss adding it to our CI.

AWS-LC should work on any system with a supported compiler. AWS-LC has been written to support Unix and Windows operating systems. AWS-LC is tested on:

• Amazon Linux 2
• Centos 7
• Ubuntu 18.04 and 20.04
• Fedora 31
• Windows Server 2019

If you use another OS and would like to make sure we maintain support, please open an issue to discuss adding it to our CI.

A portable C implementation of all algorithms is included and optimized assembly is included for some platforms. We test all changes on ARM and x86 platforms. We use AWS Graviton processors to test ARMv8 and Intel CPUs to test x86 and x86-64 compatibility. The Intel Software Development Emulator is used to test all modern x86 processors.

If you use another CPU and would like to make sure we maintain support, please open an issue to discuss adding it to our CI.

Every change is tested with our CI that includes positive and negative unit tests, fuzz tests, Sanitizers (Address, Memory, Control flow integrity, Thread, and Undefined behavior), Valgrind, and Formal Verification.

Portions of AWS-LC have been formally verified in AWS-LC Formal Verification, the checks are run in AWS-LC’s CI on every change. The algorithms that have been verified on certain platforms with caveats include:

• SHA-2
• HMAC
• AES-GCM
• AES-KWP
• ECDH & ECDSA with curve P-384

If you have any questions about Submitting PR's, Opening Issues, AWS-LC API usage or any similar topic, we have a public chatroom available here to answer your questions on Gitter.

Otherwise, if you think you might have found a security impacting issue, please instead follow our Security Notification Process.

If you discover a potential security issue in AWS-LC, we ask that you notify AWS Security via our vulnerability reporting page. Please do not create a public GitHub issue.

If you package or distribute AWS-LC, or use AWS-LC as part of a large multi-user service, you may be eligible for pre-notification of future AWS-LC releases. Please contact aws-lc-pre-notifications@amazon.com.