[New-bugs-announce] [issue27766] Add ChaCha20 Poly1305 to SSL ciphers

[Christian Heimes]

New submission from Christian Heimes:

The ssl module has two cipher suite configurations, one for server-side and the other for client-side. Issue #26470 will add OpenSSL 1.1.0 support, which will introduce new cipher suites with ChaCha 20 stream cipher and Poly1305 authenticator.

CHAHA20 should be used when GCM is not available (AES GCM > CHACHA20 > AES CBC).

$ bin/openssl ciphers 'ECDH+AESGCM:ECDH+CHACHA20:DH+AESGCM:DH+CHACHA20:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:DH+HIGH:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+HIGH:RSA+3DES:!aNULL:!eNULL:!MD5'
ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-DSS-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:DHE-DSS-AES128-GCM-SHA256:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-CCM8:ECDHE-ECDSA-AES256-CCM:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-CCM8:DHE-RSA-AES256-CCM:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA256:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:ECDHE-ECDSA-AES128-CCM8:ECDHE-ECDSA-AES128-CCM:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-CCM8:DHE-RSA-AES128-CCM:DHE-RSA-AES128-SHA256:DHE-DSS-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA:ECDHE-ECDSA-CAMELLIA256-SHA384:ECDHE-RSA-CAMELLIA256-SHA384:ECDHE-ECDSA-CAMELLIA128-SHA256:ECDHE-RSA-CAMELLIA128-SHA256:DHE-RSA-CAMELLIA256-SHA256:DHE-DSS-CAMELLIA256-SHA256:DHE-RSA-CAMELLIA128-SHA256:DHE-DSS-CAMELLIA128-SHA256:DHE-RSA-CAMELLIA256-SHA:DHE-DSS-CAMELLIA256-SHA:DHE-RSA-CAMELLIA128-SHA:DHE-DSS-CAMELLIA128-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:DHE-RSA-DES-CBC3-SHA:DHE-DSS-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-CCM8:AES256-CCM:AES128-CCM8:AES128-CCM:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:CAMELLIA256-SHA256:CAMELLIA128-SHA256:CAMELLIA256-SHA:CAMELLIA128-SHA:DES-CBC3-SHA

Bonus points:
Prefer CHACHA20 over AESGCM on hardware without AES-NI and CLMUL CPU instructions.

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components: Library (Lib)
messages: 272740
nosy: alex, christian.heimes, dstufft, giampaolo.rodola, janssen
priority: normal
severity: normal
status: open
title: Add ChaCha20 Poly1305 to SSL ciphers
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27766>
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