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C++20 port 15/15: remove the stream ciphers (#3079)

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* Remove the stream ciphers

The unauthenticated stream ciphers (aes-*-cfb, aes-*-ctr, camellia-*-cfb,
chacha20, chacha20-ietf, salsa20) are gone from every build, together
with the SS_ENABLE_LEGACY option, the C++ stream codecs, their C test
oracle and the stream-only tests and configurations. A configuration
naming one of them, or RC4/table, now fails at startup with a message
pointing to an AEAD method, and test_cli checks that.

Shell completions list only the supported methods (and now include the
2022 ones), and the docs and the compatibility contract say the stream
ciphers were removed.

* Drop the Mbed TLS CFB requirement and stale stream-cipher examples

CFB was only needed by the removed stream ciphers, so a system Mbed TLS
built without it no longer fails to configure. The public header example
now uses aes-256-gcm.
This commit is contained in:
Max Lv
2026-10-15 10:15:53 +08:00
committed by GitHub
parent 002b4093fd
commit f1f31c3c05
47 changed files with 71 additions and 1786 deletions
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docs/performance.md
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@@ -18,7 +18,7 @@ connection as ss-server / ss-local.
| aes-256-gcm | 39.0 / 39.0 | 0 / 0 |
| chacha20-ietf-poly1305 | 33.1 / 33.0 | 0 / 0 |
| 2022-blake3-aes-256-gcm | 34.0 / 32.9 | 0 / 0 |
| aes-256-cfb | 27.1 / 26.4 | 0 / 0 |
| aes-256-cfb (stream, since removed) | 27.1 / 26.4 | 0 / 0 |
With a host-name target (`localhost`, resolved by ss-server) the C++ programs
are still at 0, because c-ares allocates from its fixed heap. The C ss-server