Builtin SHA256 hashing #6977
Builtin SHA256 hashing #6977
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@MatthewJohnHeath I tried to push to your branch but I got permission denied. Made a PR in case that helps. |
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Hi Luke,
Sorry I'm slow to respond. I've been travelling. There are definitely some
problems on the branch; it builds but then in the REPL the functions seem
to be missing (although triggering a different error to *actually*
non-existent function names). I created the initial PR mostly in order to
get feedback on what might be wring (I was also expecting to be able to get
more time online these couple of weeks).
I think I am going to need some help to get it working.
…On Wed, 14 Aug 2024 at 02:26, Luke Boswell ***@***.***> wrote:
@MatthewJohnHeath <https://github.com/MatthewJohnHeath> I tried to push
to your branch but I got permission denied. Made a PR in case that helps.
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MatthewJohnHeath
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The shape of this PR is a good start, but I'm seeing a potential issue if we add other cryptographic code to this module, which would be quite unsurprising. You have |
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Otherwise, I'm attempting to get things running |
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Okay, I'm almost done getting this working, just need to coordinate the Zig and Roc builtin types. |
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The REPL worked for me! We'll still need some tests, but it should be good to go, above comments notwithstanding. |
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Also, there's no code currently to extract state from the new |
I was thinking of (only) having the type implement |
If I want to store the hash for future comparison. Not that using SHA-256 would be recommended over Argon2, but the idea holds. There are a few algorithms out there that use SHA-256 digest bytes for computation (Wikipedia), at least UUID v5 uses SHA-1 in that way. |
MatthewJohnHeath
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Tests are currently failing. @MatthewJohnHeath do you have time to implement the above fixes any time soon? If not, I can help, but it's your PR, so I'll defer to you. |
@smores56 It's not really clear to me why the build is hanging (which seems to be what is happening). I will try a few things, but might need to ask for help |
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@smores56 It's building now. Hopefully I can do those last 2 renamings of functions you asked for tomorrow. |
MatthewJohnHeath
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If this gets through the tests, would it be to merge and then do docs and tests? Or do those need to be there first? |
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It's always preferable to do at least testing, but ideally also docs, in the same PR. We'd usually avoid them if they're going to make the PR too big, or if they're blocking us merging an important change/bug fix. Since it's neither of those, I'd prefer if we can get them in this change. I'm happy to help with either the tests or docs! |
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| Sha256 := { location : U64 } | ||
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| ## Represents the digest of soem data produced by the SHA256 cryptographic hashing function as an opaque type. | ||
| ## `Digest256`implements the `Eq` ability. |
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nitpick: Digest256(space)implements ...
also, consider adding an empty doc comment between these two doc comments, that'll follow the "one-line summary on top, context beneath" structure for docs.
| Digest256 := { firstHalf : U128, secondHalf : U128 } implements [Eq] | ||
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| ## Returns a `Sha256` to which no data have been added. | ||
| emptySha256 : {} -> Sha256 |
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I'd recommend "An empty SHA-256 digest."
And it's "to which no data has been added." https://www.thesaurus.com/e/grammar/data-is-or-data-are/
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The word shouldn't be "digest", I think. We should save that for the Digest256 returned after "finalize" has been called on the zig object.
I am struggling to find a good term to describe what the Sha256 object does. My mental model of it is as the state of the algorithm, but that doesn't seem useful wording here. Something like "An empty SHA-256 hasher", maybe?
I agree that data (EDIT)is in this context; I've had too much time in settings where I get corrected the other way.
| import Result | ||
| import Str | ||
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| ## Represents, as an opaque type, the state of a SHA256 cryptographic hashing function, after some (or no) data have been added to the hash. |
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nitpick: it being an opaque type is implied, I don't think we need to explicitly mention that here.
MatthewJohnHeath
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I'm having some issues with memory running tests locally. There seems to be a failure in |
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I am having some trouble running test locally (insufficient disc space). There seems to be a failure in |
Oh I think it must be related. I didn't realise how early in the process that test was. I will try to unpick it sometime this week |
Expose the functionality of Zig's
std.crypto.hash.sha2.Sha256through a pure-functional interface to Roc.