Reynir Björnsson
02f9c2f9c7
Opam 2 only supports md5, sha256 and sha512. We don't need the extra complexity of other hash algorithms. Opam 2 will fail to parse such an opam file anyway.
64 lines
1.5 KiB
OCaml
64 lines
1.5 KiB
OCaml
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module Hash = struct
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type t = (* OpamHash.kind = *) [ `MD5 | `SHA256 | `SHA512 ]
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(* Make the compiler check that (t :> Digestif.hash') *)
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let _ = fun (h :t) -> (h :> Digestif.hash')
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let compare h h' =
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match h, h' with
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| `SHA512, `SHA512 -> 0
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| `SHA512, _ -> 1
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| _, `SHA512 -> -1
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| `SHA256, `SHA256 -> 0
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| `SHA256, _ -> 1
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| _, `SHA256 -> -1
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| `MD5, `MD5 -> 0
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let to_string = function
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| `MD5 -> "md5"
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| `SHA256 -> "sha256"
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| `SHA512 -> "sha512"
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let of_string = function
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| "md5" -> Ok `MD5
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| "sha256" -> Ok `SHA256
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| "sha512" -> Ok `SHA512
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| h -> Error (`Msg ("unknown hash algorithm: " ^ h))
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end
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module HM = Map.Make(Hash)
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type 'a digests = {
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md5 : Digestif.MD5.ctx;
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sha256 : Digestif.SHA256.ctx;
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sha512 : Digestif.SHA512.ctx;
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}
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let empty_digests =
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{
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md5 = Digestif.MD5.empty;
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sha256 = Digestif.SHA256.empty;
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sha512 = Digestif.SHA512.empty;
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}
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let update_digests { md5; sha256; sha512 } data =
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{
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md5 = Digestif.MD5.feed_string md5 data;
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sha256 = Digestif.SHA256.feed_string sha256 data;
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sha512 = Digestif.SHA512.feed_string sha512 data;
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}
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let init_write csums =
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let hash, csum = HM.max_binding csums in
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(hash, csum), Ok (empty_digests, `Init)
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let digests_to_hm digests =
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HM.empty
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|> HM.add `MD5
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Digestif.MD5.(to_raw_string (get digests.md5))
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|> HM.add `SHA256
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Digestif.SHA256.(to_raw_string (get digests.sha256))
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|> HM.add `SHA512
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Digestif.SHA512.(to_raw_string (get digests.sha512))
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