Botan (Japanese for peony flower) is a C++ cryptography library released under the permissive Simplified BSD license.
Botan's goal is to be the best option for cryptography in C++ by offering the tools necessary to implement a range of practical systems, such as TLS protocol, X.509 certificates, modern AEAD ciphers, PKCS#11 and TPM hardware support, password hashing, and post quantum crypto schemes. A Python binding is included, and several other language bindings are available. It is used in many open source and commercial products. The library is accompanied by a featureful command line interface.
See the documentation for more information about included features.
Development is coordinated on GitHub and contributions are welcome. If you need help, please open an issue on GitHub or email the botan-devel mailing list. New releases are announced on the botan-announce mailing list. If you think you have found a security issue, see the security page for contact information.
The latest release is 2.19.2 (sig), released on 2022-06-03. All releases are signed with a PGP key. See the release notes for what is new. Botan is also available through most distributions such as Fedora, Debian, Arch and Homebrew.