- Update to Botan 2.14:
  * Add support for using POWER8+ VPSUMD instruction to accelerate GCM (GH #2247)
  * Optimize the vector permute AES implementation, especially improving
    performance on ARMv7, Aarch64, and POWER. (GH #2243)
  * Use a new algorithm for modular inversions which is both faster
    and more resistant to side channel attacks. (GH #2287 #2296 #2301)
  * Address an issue in CBC padding which would leak the length of the plaintext
    which was being padded. Unpadding during decryption was not affected.
  * Optimize NIST prime field reductions, improving ECDSA by 3-9% (GH #2295)
  * Increase the size of the ECC blinding mask and scale it based on the
    size of the group order. (GH #880 #893 #2308)
  * Add server side support for the TLS asio wrapper. (GH #2229)
  * Add support for using Windows certificate store on MinGW (GH #2280)
  * Add a CLI utility cpu_clock which estimates the speed of the processor cycle counter.
  * Add Roughtime client (GH #2143 #1842)
  * Add support for XMSS X.509 certificates (GH #2172)
  * Add support for X.509 CRLs in FFI layer and Python wrapper (GH #2213)
  * Add AVX2 implementation of SHACAL2 (GH #2196)
  * Support more functionality for X.509 in the Python API (GH #2165)
  * Add generic CPU target useful when building for some new or unusual platform.
  * Disable MD5 in BSI or NIST modes (GH #2188)
  * Many currently public headers are being deprecated. If any such header is included by
    an application, a warning is issued at compile time.
    Headers issuing this warning will be made internal in a future major release.
  * RSA signature performance improvements (GH #2068 #2070)
  * Performance improvements for GCM (GH #2024 #2099 #2119), OCB (#2122), XTS (#2123) and
    ChaCha20Poly1305 (GH #2117), especially for small messages.
  * Add support for constant time AES using NEON and AltiVec (GH #2093 #2095 #2100)
  * Improve performance of POWER8 AES instructions (GH #2096)
  * Add support for the POWER9 hardware random number generator (GH #2026)
  * Add support for 64-bit version of RDRAND, doubling performance on x86-64 (GH #934 #2022)
  * In DTLS server, support a client crashing and then reconnecting from the same
    source port, as described in RFC 6347 sec 4.2.8 (GH #2029)
  * Optimize DTLS MTU splitting to split precisely to the set MTU (GH #2042)
  * Add support for the TLS v1.3 downgrade indicator. (GH #2027)
  * Add Argon2 PBKDF and password hash (GH #459 #1981 #1987)
  * Add Bcrypt-PBKDF (GH #1990)
  * Add server side support for issuing DTLS HelloVerifyRequest messages (GH #1999)
  * Add support for the TLS v1.3 supported_versions extension. (GH #1976)
  * Add Ed25519ph compatible with RFC 8032 (GH #1699 #2000)
  * Add support for OCSP stapling on server side. (GH #1703 #1967)
  * Add a boost::asio TLS stream compatible with boost::asio::ssl. (GH #1839 #1927 #1992)
  * Add a certificate store for Linux/Unix systems. (GH #1885 #1936)
  * Various Fixes

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