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| author | brian m. carlson <sandals@crustytoothpaste.net> | 2018-11-14 04:09:36 (GMT) |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2018-11-14 07:54:53 (GMT) |
| commit | 13eeedb5d17ca3539600b6618d103b652ecc8ab0 (patch) | |
| tree | 4b4dd03dafa7c67d234c8f6da3e49c4a80234f76 /t/t0015-hash.sh | |
| parent | c166599862d10a273f61b834559eaa567c3dbfd9 (diff) | |
| download | git-13eeedb5d17ca3539600b6618d103b652ecc8ab0.zip git-13eeedb5d17ca3539600b6618d103b652ecc8ab0.tar.gz git-13eeedb5d17ca3539600b6618d103b652ecc8ab0.tar.bz2 | |
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 't/t0015-hash.sh')
| -rwxr-xr-x | t/t0015-hash.sh | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/t/t0015-hash.sh b/t/t0015-hash.sh index 884fe5a..291e906 100755 --- a/t/t0015-hash.sh +++ b/t/t0015-hash.sh @@ -26,4 +26,30 @@ test_expect_success 'test basic SHA-1 hash values' ' grep 4b825dc642cb6eb9a060e54bf8d69288fbee4904 actual ' +test_expect_success 'test basic SHA-256 hash values' ' + test-tool sha256 </dev/null >actual && + grep e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 actual && + printf "a" | test-tool sha256 >actual && + grep ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb actual && + printf "abc" | test-tool sha256 >actual && + grep ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad actual && + printf "message digest" | test-tool sha256 >actual && + grep f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650 actual && + printf "abcdefghijklmnopqrstuvwxyz" | test-tool sha256 >actual && + grep 71c480df93d6ae2f1efad1447c66c9525e316218cf51fc8d9ed832f2daf18b73 actual && + # Try to exercise the chunking code by turning autoflush on. + perl -e "$| = 1; print q{aaaaaaaaaa} for 1..100000;" | \ + test-tool sha256 >actual && + grep cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0 actual && + perl -e "$| = 1; print q{abcdefghijklmnopqrstuvwxyz} for 1..100000;" | \ + test-tool sha256 >actual && + grep e406ba321ca712ad35a698bf0af8d61fc4dc40eca6bdcea4697962724ccbde35 actual && + printf "blob 0\0" | test-tool sha256 >actual && + grep 473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a303721813 actual && + printf "blob 3\0abc" | test-tool sha256 >actual && + grep c1cf6e465077930e88dc5136641d402f72a229ddd996f627d60e9639eaba35a6 actual && + printf "tree 0\0" | test-tool sha256 >actual && + grep 6ef19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321 actual +' + test_done |