diff --git a/test/dune b/test/dune
index ebf8a4d..1f24333 100644
--- a/test/dune
+++ b/test/dune
@@ -12,4 +12,4 @@
  (alias runtest)
  (deps sample.txt)
  (action
-  (run ./shatest.exe)))
+  (run ./shatest.exe -verbose)))
diff --git a/test/shatest.ml b/test/shatest.ml
index 1f365f9..6b250a3 100644
--- a/test/shatest.ml
+++ b/test/shatest.ml
@@ -110,6 +110,141 @@ let test_equal string eq arr _ =
 let test_of stringfct_to stringfct_of arr _ =
 	List.iter (fun (s,_) -> assert_equal (stringfct_to s) (stringfct_of s)) arr
 
+(* from: https://www.di-mgt.com.au/sha_testvectors.html *)
+module Vectors = struct
+  type 'a gen = unit -> 'a option
+
+  let sha1str = "sha1", fun s -> Sha1.to_hex (Sha1.string s)
+  let sha1strg = "sha1", fun g ->
+      let g = g() in
+      let ctx = Sha1.init() in
+      let rec loop () = match g() with
+        | None -> ()
+        | Some s -> Sha1.update_string ctx s; loop ()
+      in
+      loop();
+      Sha1.to_hex (Sha1.finalize ctx)
+
+  let sha256str = "sha256", fun s -> Sha256.to_hex (Sha256.string s)
+  let sha256strg = "sha256", fun g ->
+      let g = g() in
+      let ctx = Sha256.init() in
+      let rec loop () = match g() with
+        | None -> ()
+        | Some s -> Sha256.update_string ctx s; loop ()
+      in
+      loop();
+      Sha256.to_hex (Sha256.finalize ctx)
+
+  let sha512str = "sha512", fun s -> Sha512.to_hex (Sha512.string s)
+  let sha512strg = "sha512", fun g ->
+      let g = g() in
+      let ctx = Sha512.init() in
+      let rec loop () = match g() with
+        | None -> ()
+        | Some s -> Sha512.update_string ctx s; loop ()
+      in
+      loop();
+      Sha512.to_hex (Sha512.finalize ctx)
+
+  let gen_repeat n s =
+    let n = ref n in
+    fun () ->
+      if !n=0 then None
+      else (
+        decr n;
+        Some s
+      )
+
+  let test_of ~name pairs ~input : _ list =
+    List.map
+      (fun ((hash_name, hash), expect) ->
+        let test_name = name ^ "_" ^ hash_name in
+        test_name >:: fun _ctx : unit ->
+          let res = hash input in
+          assert_equal ~printer:(Printf.sprintf "%S") expect res)
+      pairs
+
+  [@@@ocaml.warning "-5"]
+
+  let suite =
+    "test_vectors" >::: List.flatten [
+      test_of ~name:"t1" [
+        sha1str,
+        "a9993e364706816aba3e25717850c26c9cd0d89d";
+        sha256str,
+        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad";
+        sha512str,
+        "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f";
+      ] ~input:"abc";
+      test_of ~name:"t2" [
+        sha1str,
+"da39a3ee5e6b4b0d3255bfef95601890afd80709";
+        sha256str,
+        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
+        sha512str,
+        "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e";
+      ] ~input:"";
+
+      test_of ~name:"t3" [
+        sha1str,
+        "84983e441c3bd26ebaae4aa1f95129e5e54670f1";
+        sha256str,
+        "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1";
+        sha512str,
+        "204a8fc6dda82f0a0ced7beb8e08a41657c16ef468b228a8279be331a703c33596fd15c13b1b07f9aa1d3bea57789ca031ad85c7a71dd70354ec631238ca3445";
+      ] ~input: "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
+
+      test_of ~name:"t4" [
+        sha1str,
+        "a49b2446a02c645bf419f995b67091253a04a259";
+        sha256str,
+        "cf5b16a778af8380036ce59e7b0492370b249b11e8f07a51afac45037afee9d1";
+        sha512str,
+        "8e959b75dae313da8cf4f72814fc143f8f7779c6eb9f7fa17299aeadb6889018501d289e4900f7e4331b99dec4b5433ac7d329eeb6dd26545e96e55b874be909";
+      ] ~input:
+        "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu";
+
+      test_of ~name:"t_Ma_1" [
+        sha1strg,
+        "34aa973cd4c4daa4f61eeb2bdbad27316534016f";
+        sha256strg,
+        "cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0";
+        sha512strg,
+        "e718483d0ce769644e2e42c7bc15b4638e1f98b13b2044285632a803afa973ebde0ff244877ea60a4cb0432ce577c31beb009c5c2c49aa2e4eadb217ad8cc09b";
+      ] ~input:(fun() -> gen_repeat 100_000 (String.make 10 'a'));
+
+      test_of ~name:"t_Ma_2" [
+        sha1strg,
+        "34aa973cd4c4daa4f61eeb2bdbad27316534016f";
+        sha256strg,
+        "cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0";
+        sha512strg,
+        "e718483d0ce769644e2e42c7bc15b4638e1f98b13b2044285632a803afa973ebde0ff244877ea60a4cb0432ce577c31beb009c5c2c49aa2e4eadb217ad8cc09b";
+      ] ~input:(fun() -> gen_repeat 10_000 (String.make 100 'a'));
+
+      test_of ~name:"t_Ma_3" [
+        sha1strg,
+        "34aa973cd4c4daa4f61eeb2bdbad27316534016f";
+        sha256strg,
+        "cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0";
+        sha512strg,
+        "e718483d0ce769644e2e42c7bc15b4638e1f98b13b2044285632a803afa973ebde0ff244877ea60a4cb0432ce577c31beb009c5c2c49aa2e4eadb217ad8cc09b";
+      ] ~input: (fun() -> gen_repeat 1_000_000 (String.make 1 'a'));
+
+      test_of ~name:"t_long" [
+        sha1strg,
+        "7789f0c9ef7bfc40d93311143dfbe69e2017f592";
+        sha256strg,
+        "50e72a0e26442fe2552dc3938ac58658228c0cbfb1d2ca872ae435266fcd055e";
+        sha512strg,
+        "b47c933421ea2db149ad6e10fce6c7f93d0752380180ffd7f4629a712134831d77be6091b819ed352c2967a2e2d4fa5050723c9630691f1a05a7281dbe6c1086";
+      ] ~input:(fun() -> gen_repeat 16_777_216
+                  "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmno");
+    ]
+
+  end
+
 let suite = "SHA binding test" >:::
 	[ "SHA1 example strings" >::
 		test_strings stringfct_hex_sha1 ex_strings_sha1;
@@ -147,6 +282,8 @@ let suite = "SHA binding test" >:::
 		test_of stringfct_bin_sha1 (fun s -> Sha1.(string s |> to_bin |> Bytes.of_string |> of_bin |> to_bin)) ex_strings_sha1;
 	  "SHA1 converting from hexadecimal representation" >::
 		test_of stringfct_hex_sha1 (fun s -> Sha1.(string s |> to_hex |> of_hex |> to_hex)) ex_strings_sha1;
+
+       Vectors.suite;
 	]
 
-let _ = run_test_tt ~verbose:true suite
+let _ = run_test_tt_main suite