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Implement support for Git hashing with SHA-256

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SHA-256 is Git's next hash algorithm. The world is still basically stuck
on SHA-1 with git, but shouldn't be. We can at least do our part to get
ready.

On the C++ implementation side, only a little bit of generalization was
needed, and that was fairly straight-forward. The tests (unit and
system) were actually bigger, and care was taken to make sure they were
all cover both algorithms equally.
This commit is contained in:
John Ericson 2025-07-24 14:44:05 -04:00
parent 7f4acb9f10
commit d21e3f88ec
20 changed files with 350 additions and 181 deletions
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17
src/libutil/hash.cc
View file

@ -20,23 +20,6 @@
namespace nix {
static size_t regularHashSize(HashAlgorithm type)
{
switch (type) {
case HashAlgorithm::BLAKE3:
return blake3HashSize;
case HashAlgorithm::MD5:
return md5HashSize;
case HashAlgorithm::SHA1:
return sha1HashSize;
case HashAlgorithm::SHA256:
return sha256HashSize;
case HashAlgorithm::SHA512:
return sha512HashSize;
}
unreachable();
}
const StringSet hashAlgorithms = {"blake3", "md5", "sha1", "sha256", "sha512"};
const StringSet hashFormats = {"base64", "nix32", "base16", "sri"};