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0e1f616
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Issue JDK-4873188 [1] asked for TLS 1.1 support for OpenJDK 1.4, 5, 6, and 7. It was implemented for OpenJDK 7 [2] and recently backported to 6 [3].
An issue to add TLS 1.2 support to OpenJDK 1.4, 5, and 6 was tracked by JDK-6916074 [4], but support for it was only added for OpenJDK 7 [5].
It is not clear at this time if TLS 1.2 is supported by OpenJDK 6. The TLS 1.1 backport [3] seems to have integrated TLS 1.2 support code (but with a seemly hard-coded max for TLS 1.1) and a fix for a TLS 1.2 bug was recently incorporated [6] which includes a test for "SSLv3", "TLSv1", "TLSv1.1", and "TLSv1.2".
JDK-7093640 [7] tracked the effort to enable TLS 1.2 by default for OpenJDK 7 and 8, but was only enabled for OpenJDK 8 [8] and 9 [9]. The rationale at the time [see 7] was to keep it disabled for OpenJDK 7 due to existing "version intolerant" servers - ie. "TLS server deployments that do not accept higher TLS version numbers, which is generally version TLS v1.0".
As for RC4, disabling it was originally reported in JDK-8076221 [10] and executed by S8043202. For OpenJDK 7, that change was integrated into IcedTea 2.5 JDK forest [11] and released in 2.5.6 [12] and 2.6.1 [13]. OpenJDK 6 got it in IcedTea 1.13.8 release [14].
References:
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[2] http://
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[7] https:/
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[11] http://
[12] http://
[13] http://
[14] http://