diff --git a/README.md b/README.md
index 26987ad..75b9d59 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ base library that provides cryptographic functions to _elykseer_ implementations
 | algo | C++ |  C  | C# | OCaml | Haskell |  
 | ---- | ---- | ---- | ---- | ---- | ---- |  
 | AES | [√](src/cpp/aes.hpp.md) | [√](src/cpp/aes_cbindings.cpp.md) | [?](src/csharp/Aes.cs.md) | [√](src/ml/lib/aes256.ml) | [?](src/haskell/Aes.hs.md) |
-| MD5 | [√](src/cpp/md5.hpp.md) | [√](src/cpp/md5_cbindings.cpp.md) | [?](src/csharp/Md5.cs.md) | [?](src/ml/lib/md5.ml) | [?](src/haskell/Md5.hs.md) |
+| MD5 | [√](src/cpp/md5.hpp.md) | [√](src/cpp/md5_cbindings.cpp.md) | [?](src/csharp/Md5.cs.md) | [√](src/ml/lib/md5.ml) | [?](src/haskell/Md5.hs.md) |
 | SHA256 | [√](src/cpp/sha256.hpp.md) | [√](src/cpp/sha256_cbindings.cpp.md) | [?](src/csharp/Sha256.cs.md) | [√](src/ml/lib/sha256.ml) | [?](src/haskell/Sha256.hs.md) |
 | KEY128 | [√](src/cpp/key128.hpp.md) | [√](src/cpp/key128_cbindings.cpp.md) | [?](src/csharp/Key128.cs.md) | [√](src/ml/lib/key128.ml) | [?](src/haskell/Key128.hs.md) |
 | KEY160 | [√](src/cpp/key160.hpp.md) | [√](src/cpp/key160_cbindings.cpp.md) | [?](src/csharp/Key160.cs.md) | [√](src/ml/lib/key160.ml) | [?](src/haskell/Key160.hs.md) |
@@ -31,6 +31,7 @@ base library that provides cryptographic functions to _elykseer_ implementations
 | Random | [√](src/cpp/random.hpp.md) | [?](src/cpp/random_cbindings.cpp.md) | [?](src/csharp/Random.cs.md) | [√](src/ml/lib/random.ml) | [?](src/haskell/Random.hs.md) |
 | RandomList | [√](src/cpp/randlist.hpp.md) | [?](src/cpp/randlist_cbindings.cpp.md) | [?](src/csharp/RandList.cs.md) | [?](src/ml/lib/randlist.ml) | [?](src/haskell/RandList.hs.md) |
 | HMAC | [√](src/cpp/hmac.hpp.md) | [√](src/cpp/hmac_cbindings.cpp.md) | [?](src/csharp/HMAC.cs.md) | [√](src/ml/lib/hmac.ml) | [?](src/haskell/HMAC.hs.md) |
+| Base64 | [√](src/cpp/base64.hpp.md) | [√](src/cpp/base64_cbindings.cpp.md) | [?](src/csharp/Base64.cs.md) | [√](src/ml/lib/base64.ml) | [?](src/haskell/Base64.hs.md) |
 
 
 # cross compilation
diff --git a/src/ml/bin/dune b/src/ml/bin/dune
index ea68d7f..75f6dc8 100644
--- a/src/ml/bin/dune
+++ b/src/ml/bin/dune
@@ -22,6 +22,12 @@
  (flags :standard -cclib -lstdc++)
  (libraries unix elykseer_crypto mlcpp_cstdio mlcpp_filesystem))
 
+(executable
+ (name md5)
+ (modules md5)
+ (flags :standard -cclib -lstdc++)
+ (libraries unix elykseer_crypto mlcpp_cstdio mlcpp_filesystem))
+
 (executable
  (name sha256)
  (modules sha256)
diff --git a/src/ml/bin/md5.ml b/src/ml/bin/md5.ml
new file mode 100644
index 0000000..64ff8c1
--- /dev/null
+++ b/src/ml/bin/md5.ml
@@ -0,0 +1,30 @@
+open Elykseer_crypto
+open Mlcpp_cstdio
+open Mlcpp_filesystem
+
+let msg = "1234567890123456789012345678901234567890123456789012345678901234"
+
+let read_file fn =
+  Cstdio.File.fopen fn "rb" |> function
+  | Ok fptr -> begin
+    let sz = Filesystem.Path.file_size (Filesystem.Path.from_string fn) in
+    let buf = Cstdio.File.Buffer.create sz in
+    Cstdio.File.fread buf sz fptr |> function
+     | Ok cnt ->
+       Ok (cnt, buf)
+     | Error (errno,errstr) -> 
+       Printf.printf "no:%d err:%s\n" errno errstr ; Error (-98)
+    end
+  | Error _ -> Error (-99)
+
+let md5file () =
+  read_file "/bin/sh" |> function
+  | Error code -> Printf.printf "Error: %d\n" code |> ignore
+  | Ok (_cnt,buf) ->
+      Md5.buffer buf |> Printf.printf "md5 of file: %s\n"
+
+let md5msg () =
+  Md5.string msg |> Printf.printf "md5 of msg: %s\n"
+
+  let () =
+  md5file () ; md5msg ()
\ No newline at end of file
diff --git a/src/ml/bin/sha256.ml b/src/ml/bin/sha256.ml
index f4c33ad..58844ea 100644
--- a/src/ml/bin/sha256.ml
+++ b/src/ml/bin/sha256.ml
@@ -5,7 +5,7 @@ open Mlcpp_filesystem
 let msg = "1234567890123456789012345678901234567890123456789012345678901234"
 
 let read_file fn =
-  Cstdio.File.fopen fn "r" |> function
+  Cstdio.File.fopen fn "rb" |> function
   | Ok fptr -> begin
     let sz = Filesystem.Path.file_size (Filesystem.Path.from_string fn) in
     let buf = Cstdio.File.Buffer.create sz in
@@ -18,7 +18,7 @@ let read_file fn =
   | Error _ -> Error (-99)
 
 let shafile () =
-  read_file "/tmp/test.txt" |> function
+  read_file "/bin/sh" |> function
   | Error code -> Printf.printf "Error: %d\n" code |> ignore
   | Ok (_cnt,buf) ->
       Sha256.buffer buf |> Printf.printf "sha256 of file: %s\n"
diff --git a/src/ml/lib/dune b/src/ml/lib/dune
index 658ded0..c6f594a 100644
--- a/src/ml/lib/dune
+++ b/src/ml/lib/dune
@@ -4,10 +4,10 @@
  (preprocess
   (pps ppx_optcomp))
  (no_dynlink)
- (modules key128 key160 key256 aes256 random sha256 hmac base64)
+ (modules key128 key160 key256 aes256 random md5 sha256 hmac base64)
  (c_library_flags :standard -lstdc++)
  (foreign_stubs (language cxx) (flags :standard -I ../../../../../ext -I ../../../../../build/src -std=c++20 -fno-exceptions)
-   (names key128 key160 key256 aes256 random sha256 hmac base64))
+   (names key128 key160 key256 aes256 random md5 sha256 hmac base64))
  (foreign_archives elykseer-crypto_cpp)
  (libraries unix mlcpp_cstdio)
 )
diff --git a/src/ml/lib/md5.cxx b/src/ml/lib/md5.cxx
new file mode 100644
index 0000000..40b70ec
--- /dev/null
+++ b/src/ml/lib/md5.cxx
@@ -0,0 +1,55 @@
+// OCaml includes
+extern "C" {
+#include <caml/mlvalues.h>
+#include <caml/memory.h>
+#include <caml/alloc.h>
+// #include <caml/bigarray.h>
+// #include <caml/custom.h>
+// #include <caml/callback.h>
+// #include <caml/fail.h>
+
+#include <sys/errno.h>
+} //extern C
+
+// C++ includes
+#include <string>
+#include <filesystem>
+
+#include "lxr/key128.hpp"
+#include "lxr/md5.hpp"
+
+using namespace lxr;
+
+struct _cpp_cstdio_buffer {
+    char *_buf {nullptr};
+    long _len {0};
+};
+
+#define CPP_CSTDIO_BUFFER(v) (*((_cpp_cstdio_buffer**) Data_custom_val(v)))
+
+/*
+ *   cpp_string_md5 : string -> string
+ */
+extern "C" {
+value cpp_string_md5(value vs)
+{
+    CAMLparam1(vs);
+    const char *s = String_val(vs);
+    const int len = caml_string_length(vs);
+    auto k = lxr::Md5::hash(s, len);
+    CAMLreturn(caml_copy_string(k.toHex().c_str()));
+}
+} // extern C
+
+/*
+ *   cpp_buffer_md5 : buffer -> string
+ */
+extern "C" {
+value cpp_buffer_md5(value vb)
+{
+    CAMLparam1(vb);
+    struct _cpp_cstdio_buffer *b = CPP_CSTDIO_BUFFER(vb);
+    auto k = lxr::Md5::hash(b->_buf, b->_len);
+    CAMLreturn(caml_copy_string(k.toHex().c_str()));
+}
+} // extern C
diff --git a/src/ml/lib/md5.ml b/src/ml/lib/md5.ml
new file mode 100644
index 0000000..a0c2034
--- /dev/null
+++ b/src/ml/lib/md5.ml
@@ -0,0 +1,5 @@
+
+type b = Mlcpp_cstdio.Cstdio.File.Buffer.ta
+
+external string : string -> string = "cpp_string_md5"
+external buffer : b -> string = "cpp_buffer_md5"
diff --git a/src/ml/lib/md5.mli b/src/ml/lib/md5.mli
new file mode 100644
index 0000000..5c15b2f
--- /dev/null
+++ b/src/ml/lib/md5.mli
@@ -0,0 +1,5 @@
+
+type b = Mlcpp_cstdio.Cstdio.File.Buffer.ta
+
+val string : string -> string
+val buffer : b -> string