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botan botan botan botan botan is a c cryptography library released under the permissive simplified bsd license botan s goal is to be the best option for production cryptography by offering the tools necessary to implement a range of practical systems such as tlsv1 3 x 509 pki modern aead ciphers support for pkcs 11 and tpm hardware memory hard password hashing and post quantum cryptography all of this is covered by an extensive test suite including an automated system for detecting side channels the modular build system allows enabling or disabling features in a fine grained way and amalgamation builds are also supported it comes out of the box with c c and python apis and several other language bindings are available the library is accompanied by a featureful command line interface consult the documentation for more information development is coordinated on github and contributions are welcome if you need help please open an issue on github if you think you have found a security issue see the security page for contact information releases all releases are signed with a pgp key see the release notes for what s new botan is also available through most distributions such as fedora debian arch and homebrew botan3 new minor releases of botan3 are made quarterly normally on the first tuesday of february may august and november the latest release in the botan3 series is 3 13 0 sig released on 2026 08 13 botan2 botan2 has as of 2025 01 01 reached end of life no further releases are expected the latest release in the botan2 series is 2 19 5 sig released on 2024 07 08 find enclosed transport layer security tls protocol tls v1 2 v1 3 and dtls v1 2 supported extensions include session tickets sni alpn ocsp stapling encrypt then mac cbc and extended master secret supports authentication using certificates or preshared keys psk supports record encryption with modern aead modes as well as legacy cbc ciphersuites tls 1 3 supports hybrid post quantum key exchange using ml kem or frodokem public key infrastructure x 509v3 certificates and crl creation and handling pkix certificate path validation including name constraints ocsp request creation and response handling pkcs 10 certificate request generation and processing access to windows macos and unix system certificate stores sql database backed certificate store public key cryptography rsa signatures and encryption dh ecdh x25519 and x448 key agreement elliptic curve signature schemes ecdsa ed25519 ed448 ecgdsa eckcdsa sm2 post quantum signature schemes ml dsa dilithium slh dsa sphincs hss lms xmss post quantum key encapsulation schemes ml kem kyber frodokem classic mceliece ciphers hashes macs and checksums authenticated cipher modes eax ocb gcm siv ccm x chacha20poly1305 cipher modes ctr cbc xts cfb ofb block ciphers aes aria blowfish camellia cast 128 des 3des idea seed serpent shacal2 sm4 threefish 512 twofish stream ciphers x chacha20 x salsa20 rc4 hash functions sha 1 sha 2 sha 3 ripemd 160 blake2b blake2s skein 512 sm3 whirlpool password hashing schemes argon2 scrypt bcrypt and pbkdf2 authentication codes hmac cmac poly1305 kmac gmac other useful things full c pkcs 11 api wrapper interfaces for tpm v2 0 device access simple compression api wrapping zlib bzip2 and lzma libraries rng wrappers for system rng esdm and hardware rngs hmac_drbg and entropy collection system for userspace rngs srp 6a password authenticated key exchange key derivation functions including hkdf kdf2 sp 800 108 sp 800 56a sp 800 56c hotp and totp algorithms format preserving encryption scheme fe1 threshold secret sharing roughtime client zfec compatible forward error correction encoding encoding schemes including hex base32 base64 and base58 nist key wrapping boost asio compatible tls client stream 24 bit openpgp crc table of contents botan releases botan3 botan2 find enclosed transport layer security tls protocol public key infrastructure public key cryptography ciphers hashes macs and checksums other useful things release notes security advisories user guide api reference search previous next index last updated on 2026 08 13