commit | 13eeedb5d17ca3539600b6618d103b652ecc8ab0 | [log] [tgz] |
---|---|---|
author | brian m. carlson <sandals@crustytoothpaste.net> | Wed Nov 14 04:09:36 2018 +0000 |
committer | Junio C Hamano <gitster@pobox.com> | Wed Nov 14 16:54:53 2018 +0900 |
tree | 4b4dd03dafa7c67d234c8f6da3e49c4a80234f76 | |
parent | c166599862d10a273f61b834559eaa567c3dbfd9 [diff] |
Add a base implementation of SHA-256 support SHA-1 is weak and we need to transition to a new hash function. For some time, we have referred to this new function as NewHash. Recently, we decided to pick SHA-256 as NewHash. The reasons behind the choice of SHA-256 are outlined in the thread starting at [1] and in the commit history for the hash function transition document. Add a basic implementation of SHA-256 based off libtomcrypt, which is in the public domain. Optimize it and restructure it to meet our coding standards. Pull in the update and final functions from the SHA-1 block implementation, as we know these function correctly with all compilers. This implementation is slower than SHA-1, but more performant implementations will be introduced in future commits. Wire up SHA-256 in the list of hash algorithms, and add a test that the algorithm works correctly. Note that with this patch, it is still not possible to switch to using SHA-256 in Git. Additional patches are needed to prepare the code to handle a larger hash algorithm and further test fixes are needed. [1] https://public-inbox.org/git/20180609224913.GC38834@genre.crustytoothpaste.net/ Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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