diff options
Diffstat (limited to 'third_party/git/Documentation/technical/hash-function-transition.txt')
| -rw-r--r-- | third_party/git/Documentation/technical/hash-function-transition.txt | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/third_party/git/Documentation/technical/hash-function-transition.txt b/third_party/git/Documentation/technical/hash-function-transition.txt index 2ae8fa470a..6fd20ebbc2 100644 --- a/third_party/git/Documentation/technical/hash-function-transition.txt +++ b/third_party/git/Documentation/technical/hash-function-transition.txt @@ -531,7 +531,7 @@ Until Git protocol gains SHA-256 support, using SHA-256 based storage on public-facing Git servers is strongly discouraged. Once Git protocol gains SHA-256 support, SHA-256 based servers are likely not to support SHA-1 compatibility, to avoid what may be a very expensive -hash reencode during clone and to encourage peers to modernize. +hash re-encode during clone and to encourage peers to modernize. The design described here allows fetches by SHA-1 clients of a personal SHA-256 repository because it's not much more difficult than @@ -602,7 +602,7 @@ git --output-format=sha1 log abac87a^{sha1}..f787cac^{sha256} Choice of Hash -------------- -In early 2005, around the time that Git was written, Xiaoyun Wang, +In early 2005, around the time that Git was written, Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu announced an attack finding SHA-1 collisions in 2^69 operations. In August they published details. Luckily, no practical demonstrations of a collision in full SHA-1 were @@ -650,7 +650,6 @@ Some initial steps can be implemented independently of one another: The first user-visible change is the introduction of the objectFormat extension (without compatObjectFormat). This requires: -- implementing the loose-object-idx - teaching fsck about this mode of operation - using the hash function API (vtable) when computing object names - signing objects and verifying signatures @@ -658,6 +657,7 @@ extension (without compatObjectFormat). This requires: repository Next comes introduction of compatObjectFormat: +- implementing the loose-object-idx - translating object names between object formats - translating object content between object formats - generating and verifying signatures in the compat format @@ -730,7 +730,7 @@ adoption. Using hash functions in parallel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -(e.g. https://public-inbox.org/git/22708.8913.864049.452252@chiark.greenend.org.uk/ ) +(e.g. https://lore.kernel.org/git/22708.8913.864049.452252@chiark.greenend.org.uk/ ) Objects newly created would be addressed by the new hash, but inside such an object (e.g. commit) it is still possible to address objects using the old hash function. @@ -783,7 +783,7 @@ bmwill@google.com, jonathantanmy@google.com, jrnieder@gmail.com, sbeller@google.com Initial version sent to -http://public-inbox.org/git/20170304011251.GA26789@aiede.mtv.corp.google.com +http://lore.kernel.org/git/20170304011251.GA26789@aiede.mtv.corp.google.com 2017-03-03 jrnieder@gmail.com Incorporated suggestions from jonathantanmy and sbeller: @@ -820,8 +820,8 @@ Later history: edits. This document history is no longer being maintained as it would now be superfluous to the commit log -[1] http://public-inbox.org/git/CA+55aFzJtejiCjV0e43+9oR3QuJK2PiFiLQemytoLpyJWe6P9w@mail.gmail.com/ -[2] http://public-inbox.org/git/CA+55aFz+gkAsDZ24zmePQuEs1XPS9BP_s8O7Q4wQ7LV7X5-oDA@mail.gmail.com/ -[3] http://public-inbox.org/git/20170306084353.nrns455dvkdsfgo5@sigill.intra.peff.net/ -[4] http://public-inbox.org/git/20170304224936.rqqtkdvfjgyezsht@genre.crustytoothpaste.net -[5] https://public-inbox.org/git/CAJo=hJtoX9=AyLHHpUJS7fueV9ciZ_MNpnEPHUz8Whui6g9F0A@mail.gmail.com/ +[1] http://lore.kernel.org/git/CA+55aFzJtejiCjV0e43+9oR3QuJK2PiFiLQemytoLpyJWe6P9w@mail.gmail.com/ +[2] http://lore.kernel.org/git/CA+55aFz+gkAsDZ24zmePQuEs1XPS9BP_s8O7Q4wQ7LV7X5-oDA@mail.gmail.com/ +[3] http://lore.kernel.org/git/20170306084353.nrns455dvkdsfgo5@sigill.intra.peff.net/ +[4] http://lore.kernel.org/git/20170304224936.rqqtkdvfjgyezsht@genre.crustytoothpaste.net +[5] https://lore.kernel.org/git/CAJo=hJtoX9=AyLHHpUJS7fueV9ciZ_MNpnEPHUz8Whui6g9F0A@mail.gmail.com/ |