SymCrypt is a core cryptographic function library developed by Microsoft. It began in late 2006, initially focusing on symmetric cryptographic operations. Since Windows 8, it has served as the primary crypto library for symmetric algorithms, and from Windows 10 version 1703, it became the main crypto library for all algorithms within Windows. Its key objectives include providing secure implementations of cryptographic algorithms for Microsoft products, ensuring compatibility across all Windows-supported CPU architectures, delivering strong performance, minimizing maintenance efforts, supporting FIPS 140 certification, and maintaining a high level of assurance in its functionality.
Source :: https://github.com/microsoft/SymCrypt