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0bc2bb6723
Auto-detect Mbed TLS 4.x via MBEDTLS_VERSION_MAJOR and adapt the backend: - Include psa/crypto.h and drop the headers removed in 4.x (ctr_drbg, entropy, md5, sha*), gated behind the version macro. - Compute MD5/SHA-256/SHA-512 via PSA (psa_hash_compute) and initialize PSA Crypto once with std::call_once. - Drop the explicit entropy/CTR-DRBG RNG (PSA provides the TLS RNG) and skip the RNG-callback overloads of pk_parse_key/pk_check_pair on 4.x. - Retry on a TLS 1.3 NewSessionTicket (the 4.x default) in connect, read, write and is_peer_closed via a single mbedtls_is_session_ticket() helper, so online HTTPS works, including large redirected downloads where the ticket arrives mid-write. Note V4 implies V3, so 3.x-only paths now check V3 && !V4. Build systems (macOS): the CMake config and pkg-config shipped by Homebrew resolve 4.x transitively, so CMakeLists.txt and meson.build need no change for linking; the Makefile links libtfpsacrypto when present, else libmbedcrypto. Tests: generate the encrypted client key as both PBES2-AES (3.6+/4.x, OpenSSL, wolfSSL) and PBES1-3DES (Mbed TLS 2.28) and pick by version, since 4.x dropped DES and 2.28 lacks PBES2. Also generate the IP-host certs in test/meson.build to match gen-certs.sh and CMakeLists.txt.
