diff --git a/extmod/modubinascii.c b/extmod/modubinascii.c
new file mode 100644
index 0000000000..8cab7d6781
--- /dev/null
+++ b/extmod/modubinascii.c
@@ -0,0 +1,88 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Paul Sokolovsky
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+#include "mpconfig.h"
+#include "nlr.h"
+#include "misc.h"
+#include "qstr.h"
+#include "obj.h"
+#include "runtime.h"
+#include "binary.h"
+
+#if MICROPY_PY_UBINASCII
+
+STATIC mp_obj_t mod_binascii_hexlify(mp_uint_t n_args, const mp_obj_t *args) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
+
+    byte *in = bufinfo.buf, *out;
+    mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, bufinfo.len * 2, &out);
+    for (mp_uint_t i = bufinfo.len; i--;) {
+        byte d = (*in >> 4);
+        if (d > 9) {
+            d += 'a' - '9' - 1;
+        }
+        *out++ = d + '0';
+        d = (*in++ & 0xf);
+        if (d > 9) {
+            d += 'a' - '9' - 1;
+        }
+        *out++ = d + '0';
+    }
+    return mp_obj_str_builder_end(o);
+}
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_binascii_hexlify_obj, 1, 2, mod_binascii_hexlify);
+
+STATIC const mp_map_elem_t mp_module_binascii_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_ubinascii) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_hexlify), (mp_obj_t)&mod_binascii_hexlify_obj },
+//    { MP_OBJ_NEW_QSTR(MP_QSTR_unhexlify), (mp_obj_t)&mod_binascii_unhexlify_obj },
+//    { MP_OBJ_NEW_QSTR(MP_QSTR_a2b_base64), (mp_obj_t)&mod_binascii_a2b_base64_obj },
+//    { MP_OBJ_NEW_QSTR(MP_QSTR_b2a_base64), (mp_obj_t)&mod_binascii_b2a_base64_obj },
+};
+
+STATIC const mp_obj_dict_t mp_module_binascii_globals = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 1,
+        .table_is_fixed_array = 1,
+        .used = MP_ARRAY_SIZE(mp_module_binascii_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_binascii_globals_table),
+        .table = (mp_map_elem_t*)mp_module_binascii_globals_table,
+    },
+};
+
+const mp_obj_module_t mp_module_ubinascii = {
+    .base = { &mp_type_module },
+    .name = MP_QSTR_ubinascii,
+    .globals = (mp_obj_dict_t*)&mp_module_binascii_globals,
+};
+
+#endif //MICROPY_PY_UBINASCII
diff --git a/py/builtin.h b/py/builtin.h
index a6736152c5..a63752c5fa 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -95,3 +95,4 @@ extern const mp_obj_module_t mp_module_ujson;
 extern const mp_obj_module_t mp_module_ure;
 extern const mp_obj_module_t mp_module_uheapq;
 extern const mp_obj_module_t mp_module_uhashlib;
+extern const mp_obj_module_t mp_module_ubinascii;
diff --git a/py/builtintables.c b/py/builtintables.c
index 1777838e0b..ebf8ddf4a7 100644
--- a/py/builtintables.c
+++ b/py/builtintables.c
@@ -224,6 +224,9 @@ STATIC const mp_map_elem_t mp_builtin_module_table[] = {
 #if MICROPY_PY_UHASHLIB
     { MP_OBJ_NEW_QSTR(MP_QSTR_uhashlib), (mp_obj_t)&mp_module_uhashlib },
 #endif
+#if MICROPY_PY_UBINASCII
+    { MP_OBJ_NEW_QSTR(MP_QSTR_ubinascii), (mp_obj_t)&mp_module_ubinascii },
+#endif
 
     // extra builtin modules as defined by a port
     MICROPY_PORT_BUILTIN_MODULES
diff --git a/py/mpconfig.h b/py/mpconfig.h
index f4f9986e4d..4bd7bfeab7 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -439,6 +439,10 @@ typedef double mp_float_t;
 #define MICROPY_PY_UHASHLIB (0)
 #endif
 
+#ifndef MICROPY_PY_UBINASCII
+#define MICROPY_PY_UBINASCII (0)
+#endif
+
 /*****************************************************************************/
 /* Hooks for a port to add builtins                                          */
 
diff --git a/py/py.mk b/py/py.mk
index aa1f7e7633..52c284e519 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -117,6 +117,7 @@ PY_O_BASENAME = \
 	../extmod/moduzlib.o \
 	../extmod/moduheapq.o \
 	../extmod/moduhashlib.o \
+	../extmod/modubinascii.o \
 
 # prepend the build destination prefix to the py object files
 PY_O = $(addprefix $(PY_BUILD)/, $(PY_O_BASENAME))
diff --git a/py/qstrdefs.h b/py/qstrdefs.h
index ccf6a8c28b..177d56e54c 100644
--- a/py/qstrdefs.h
+++ b/py/qstrdefs.h
@@ -518,3 +518,8 @@ Q(digest)
 Q(hexdigest)
 Q(sha256)
 #endif
+
+#if MICROPY_PY_UBINASCII
+Q(ubinascii)
+Q(hexlify)
+#endif
diff --git a/unix/mpconfigport.h b/unix/mpconfigport.h
index 3e99a5c56b..e08da770ad 100644
--- a/unix/mpconfigport.h
+++ b/unix/mpconfigport.h
@@ -62,6 +62,7 @@
 #define MICROPY_PY_URE              (1)
 #define MICROPY_PY_UHEAPQ           (1)
 #define MICROPY_PY_UHASHLIB         (1)
+#define MICROPY_PY_UBINASCII        (1)
 
 // Define to MICROPY_ERROR_REPORTING_DETAILED to get function, etc.
 // names in exception messages (may require more RAM).