May 26, 2018

Implementation of TLS/SSL in C

BearSSL is an implementation of the SSL/TLS protocol RFC 5246 written in C. It aims at offering the following features

  • Be correct and secure. In particular, insecure protocol versions and choices of algorithms are not supported, by design; cryptographic algorithm implementations are constant-time by default.

  • Be small, both in RAM and code footprint. For instance, a minimal server implementation may fit in about 20 kilobytes of compiled code and 25 kilobytes of RAM.

  • Be highly portable. BearSSL targets not only “big” operating systems like Linux and Windows, but also small embedded systems and even special contexts like bootstrap code.

  • Be feature-rich and extensible. SSL/TLS has many defined cipher suites and extensions; BearSSL should implement most of them, and allow extra algorithm implementations to be added afterwards, possibly from third parties.

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