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author | brian m. carlson <sandals@crustytoothpaste.net> | 2018-11-14 07:09:36 +0300 |
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committer | Junio C Hamano <gitster@pobox.com> | 2018-11-14 10:54:53 +0300 |
commit | 13eeedb5d17ca3539600b6618d103b652ecc8ab0 (patch) | |
tree | 4b4dd03dafa7c67d234c8f6da3e49c4a80234f76 /submodule-config.c | |
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>
Diffstat (limited to 'submodule-config.c')
0 files changed, 0 insertions, 0 deletions