diff --git a/src/Makefile b/src/Makefile
index 5425b524f..7e36cde65 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -106,6 +106,7 @@ UTILS_LIB_INTFS := \
   utils/hex_encode.mli \
   utils/utils.mli \
   utils/cli_entries.mli \
+	utils/crypto_box.mli \
   utils/compare.mli \
   utils/data_encoding.mli \
   utils/time.mli \
@@ -123,6 +124,7 @@ UTILS_LIB_IMPLS := \
   utils/utils.ml \
   utils/cli_entries.ml \
   utils/compare.ml \
+	utils/crypto_box.ml \
   utils/data_encoding.ml \
   utils/time.ml \
   utils/hash.ml \
diff --git a/src/utils/crypto_box.ml b/src/utils/crypto_box.ml
new file mode 100644
index 000000000..f633f851c
--- /dev/null
+++ b/src/utils/crypto_box.ml
@@ -0,0 +1,21 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2016.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+(** Tezos - X25519/XSalsa20-Poly1305 cryptography *)
+
+type secret_key = Sodium.Box.secret_key
+type public_key = Sodium.Box.public_key
+type channel_key = Sodium.Box.channel_key
+type nonce = Sodium.Box.nonce
+
+let random_keypair = Sodium.Box.random_keypair
+let random_nonce = Sodium.Box.random_nonce
+let increment_nonce = Sodium.Box.increment_nonce
+let box = Sodium.Box.Bigbytes.box
+let box_open = Sodium.Box.Bigbytes.box_open
diff --git a/src/utils/crypto_box.mli b/src/utils/crypto_box.mli
new file mode 100644
index 000000000..1df44ea44
--- /dev/null
+++ b/src/utils/crypto_box.mli
@@ -0,0 +1,20 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2016.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+(** Tezos - X25519/XSalsa20-Poly1305 cryptography *)
+
+type secret_key
+type public_key
+type nonce
+
+val random_keypair : unit -> secret_key * public_key
+val random_nonce : unit -> nonce
+val increment_nonce : ?step:int -> nonce -> nonce
+val box : secret_key -> public_key -> MBytes.t -> nonce -> MBytes.t
+val box_open : secret_key -> public_key -> MBytes.t -> nonce -> MBytes.t