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TLS: remove support for Secure Transport and BearSSL

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These libraries do not support TLS 1.3 and have been marked for removal
for over a year. We want to help users select a TLS dependency that is
future-proof and reliable, and not supporting TLS 1.3 in 2025 does not
infer confidence. Users who build libcurl are likely to be served better
and get something more future-proof with a TLS library that supports
1.3.

Closes #16677
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Daniel Stenberg 2025-06-09 14:07:21 +02:00
parent b761eb5add
commit 08a3e8e19a
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7
docs/CIPHERS.md
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@ -96,8 +96,7 @@ are NULL ciphers, offering no encryption whatsoever.)
### TLS 1.2 (1.1, 1.0) cipher suites
Setting TLS 1.2 cipher suites is supported by curl with OpenSSL, LibreSSL,
BoringSSL, mbedTLS (curl 8.8.0+), wolfSSL (curl 7.53.0+),
Secure Transport (curl 7.77.0+) and BearSSL (curl 7.83.0+). Schannel does not
BoringSSL, mbedTLS (curl 8.8.0+), wolfSSL (curl 7.53.0+). Schannel does not
support setting cipher suites directly, but does support setting algorithms
(curl 7.61.0+), see Schannel notes below.
@ -201,7 +200,7 @@ ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305 \
```
Restrict TLS 1.2 ciphers to `aes128-gcm` and `chacha20`, use default TLS 1.3
ciphers (if TLS 1.3 is available). Works with OpenSSL, LibreSSL, BoringSSL,
mbedTLS, wolfSSL, Secure Transport and BearSSL.
mbedTLS and wolfSSL.
## ciphers, the GnuTLS way
@ -266,8 +265,6 @@ Restrict to only TLS 1.2 with the `CAMELLIA-128-GCM` cipher.
- [wolfSSL cipher support documentation](https://www.wolfssl.com/documentation/manuals/wolfssl/chapter04.html#cipher-support)
- [mbedTLS cipher suites reference](https://mbed-tls.readthedocs.io/projects/api/en/development/api/file/ssl__ciphersuites_8h/)
- [Schannel cipher suites documentation](https://learn.microsoft.com/en-us/windows/win32/secauthn/cipher-suites-in-schannel)
- [BearSSL supported crypto](https://www.bearssl.org/support.html)
- [Secure Transport cipher suite values](https://developer.apple.com/documentation/security/1550981-ssl_cipher_suite_values)
- [IANA cipher suites list](https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4)
- [Wikipedia cipher suite article](https://en.wikipedia.org/wiki/Cipher_suite)
- [GnuTLS Priority Strings](https://gnutls.org/manual/html_node/Priority-Strings.html)