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ecc-guest pushed a commit to branch master
in repository approx.

commit 36482244190b748a6f63ebd8006dfca94d304543
Author: Eric Cooper <e...@cmu.edu>
Date:   Sat Jul 22 15:11:15 2017 -0400

    use cryptokit for checksum functions
---
 _tags   |  4 ++--
 util.ml | 29 ++++++++++++++---------------
 2 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/_tags b/_tags
index ee83e10..3574409 100644
--- a/_tags
+++ b/_tags
@@ -8,10 +8,10 @@
 <config_file.ml>: package(pcre)
 <log.ml>: package(netsys)
 <url.ml>: package(netstring)
-<util.ml>: package(sha)
+<util.ml>: package(cryptokit)
 <import.ml>: package(pcre)
 
-<**/*.{byte,native}>: package(netsys), package(pcre), package(sha)
+<**/*.{byte,native}>: package(netsys), package(pcre), package(cryptokit)
 <approx.{byte,native}>: package(nethttpd)
 
 <tests/*>: package(oUnit)
diff --git a/util.ml b/util.ml
index 3cf8858..b2bee90 100644
--- a/util.ml
+++ b/util.ml
@@ -301,21 +301,20 @@ let iter_dirs = iter_of_fold fold_dirs
 
 let iter_non_dirs = iter_of_fold fold_non_dirs
 
-module type MD =
-  sig
-    type t
-    val file : string -> t
-    val to_hex : t -> string
-  end
-
-module FileDigest (MsgDigest : MD) =
-  struct
-    let sum file = MsgDigest.to_hex (MsgDigest.file file)
-  end
-
-let file_md5sum = let module F = FileDigest(Digest) in F.sum
-let file_sha1sum = let module F = FileDigest(Sha1) in F.sum
-let file_sha256sum = let module F = FileDigest(Sha256) in F.sum
+let to_hex s =
+  let n = String.length s in
+  let hex = Bytes.create (2*n) in
+  for i = 0 to n-1 do
+    Bytes.blit_string (sprintf "%02x" (Char.code s.[i])) 0 hex (2*i) 2
+  done;
+  hex
+
+let hash_file hash file =
+  to_hex (with_in_channel open_in file (Cryptokit.hash_channel hash ?len:None))
+
+let file_md5sum = hash_file (Cryptokit.Hash.md5 ())
+let file_sha1sum = hash_file (Cryptokit.Hash.sha1 ())
+let file_sha256sum = hash_file (Cryptokit.Hash.sha256 ())
 
 let user_id =
   object

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