From c0adb3ceb934f9af81832737bca869857d08bb3a Mon Sep 17 00:00:00 2001
From: David Whitlock <alovedalongthe@gmail.com>
Date: Tue, 4 Jul 2017 21:14:41 +0800
Subject: [PATCH] Initial commit

---
 .gitignore              |   8 +
 Makefile                |  35 +++
 Makefile.win            |  34 +++
 README.md               |  19 ++
 c_src/bcrypt_nif.c      | 174 +++++++++++++++
 c_src/blowfish.c        | 470 ++++++++++++++++++++++++++++++++++++++++
 c_src/erl_blf.h         |  68 ++++++
 lib/bcrypt.ex           |  72 ++++++
 lib/bcrypt/base.ex      |  92 ++++++++
 lib/bcrypt/base64.ex    | 102 +++++++++
 lib/bcrypt/stats.ex     |  35 +++
 lib/bcrypt/tools.ex     |  24 ++
 mix.exs                 |  45 ++++
 mix.lock                |   3 +
 test/base64_test.exs    |   5 +
 test/base_test.exs      | 113 ++++++++++
 test/bcrypt_test.exs    |   4 +
 test/reference_test.exs |  20 ++
 test/stats_test.exs     |  19 ++
 test/test_helper.exs    |   1 +
 20 files changed, 1343 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 Makefile.win
 create mode 100644 README.md
 create mode 100644 c_src/bcrypt_nif.c
 create mode 100644 c_src/blowfish.c
 create mode 100644 c_src/erl_blf.h
 create mode 100644 lib/bcrypt.ex
 create mode 100644 lib/bcrypt/base.ex
 create mode 100644 lib/bcrypt/base64.ex
 create mode 100644 lib/bcrypt/stats.ex
 create mode 100644 lib/bcrypt/tools.ex
 create mode 100644 mix.exs
 create mode 100644 mix.lock
 create mode 100644 test/base64_test.exs
 create mode 100644 test/base_test.exs
 create mode 100644 test/bcrypt_test.exs
 create mode 100644 test/reference_test.exs
 create mode 100644 test/stats_test.exs
 create mode 100644 test/test_helper.exs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d9d343f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+/_build/
+/cover/
+/deps/
+/doc/
+/priv/
+/.fetch
+erl_crash.dump
+*.ez
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ae23477
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+CFLAGS = -g -O3 -Wall
+
+ERLANG_PATH = $(shell erl -eval 'io:format("~s", [lists:concat([code:root_dir(), "/erts-", erlang:system_info(version), "/include"])])' -s init stop -noshell)
+CFLAGS += -I$(ERLANG_PATH)
+CFLAGS += -Ic_src
+
+LIB_NAME = priv/bcrypt_nif.so
+ifneq ($(CROSSCOMPILE),)
+    # crosscompiling
+    CFLAGS += -fPIC
+else
+    # not crosscompiling
+    ifneq ($(OS),Windows_NT)
+        CFLAGS += -fPIC
+
+        ifeq ($(shell uname),Darwin)
+            LDFLAGS += -dynamiclib -undefined dynamic_lookup
+        endif
+    endif
+endif
+
+NIF_SRC=\
+	c_src/bcrypt_nif.c\
+	c_src/blowfish.c
+
+all: $(LIB_NAME)
+
+$(LIB_NAME): $(NIF_SRC)
+	mkdir -p priv
+	$(CC) $(CFLAGS) -shared $(LDFLAGS) $^ -o $@
+
+clean:
+	rm -f $(LIB_NAME)
+
+.PHONY: all clean
diff --git a/Makefile.win b/Makefile.win
new file mode 100644
index 0000000..0348480
--- /dev/null
+++ b/Makefile.win
@@ -0,0 +1,34 @@
+!IF [where /Q Makefile.auto.win]
+# The file doesn't exist, so don't include it.
+!ELSE
+!INCLUDE Makefile.auto.win
+!IF [del /Q /F Makefile.auto.win] == 0
+!ENDIF
+!ENDIF
+
+BCRYPT_PATH = c_src
+NMAKE = nmake /$(MAKEFLAGS)
+CFLAGS = /O2 /EHsc /I"$(BCRYPT_PATH)"
+
+NIF_SRC=\
+	c_src\bcrypt_nif.c\
+	c_src\blowfish.c
+
+all: clean priv\bcrypt_nif.dll
+
+clean:
+	del /Q /F priv
+
+Makefile.auto.win:
+	erl -eval "io:format(\"~s~n\", [lists:concat([\"ERTS_INCLUDE_PATH=\", code:root_dir(), \"/erts-\", erlang:system_info(version), \"/include\"])])" -s init stop -noshell > $@
+
+!IFDEF ERTS_INCLUDE_PATH
+priv\bcrypt_nif.dll:
+	if NOT EXIST "priv" mkdir "priv"
+	$(CC) $(CFLAGS) /I"$(ERTS_INCLUDE_PATH)" /LD /MD /Fe$@ $(NIF_SRC)
+!ELSE
+priv\bcrypt_nif.dll: Makefile.auto.win
+	$(NMAKE) /F Makefile.win priv\bcrypt_nif.dll
+!ENDIF
+
+.PHONY: all clean
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..55ca6d4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+# BcryptElixir
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `bcrypt_elixir` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [{:bcrypt_elixir, "~> 0.1.0"}]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/bcrypt_elixir](https://hexdocs.pm/bcrypt_elixir).
+
diff --git a/c_src/bcrypt_nif.c b/c_src/bcrypt_nif.c
new file mode 100644
index 0000000..6c7fa57
--- /dev/null
+++ b/c_src/bcrypt_nif.c
@@ -0,0 +1,174 @@
+/*	$OpenBSD: bcrypt.c,v 1.52 2015/01/28 23:33:52 tedu Exp $	*/
+
+/*
+ * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
+ * Copyright (c) 1997 Niels Provos <provos@umich.edu>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/* This password hashing algorithm was designed by David Mazieres
+ * <dm@lcs.mit.edu> and works as follows:
+ *
+ * 1. state := InitState ()
+ * 2. state := ExpandKey (state, salt, password)
+ * 3. REPEAT rounds:
+ *      state := ExpandKey (state, 0, password)
+ *	state := ExpandKey (state, 0, salt)
+ * 4. ctext := "OrpheanBeholderScryDoubt"
+ * 5. REPEAT 64:
+ * 	ctext := Encrypt_ECB (state, ctext);
+ * 6. RETURN Concatenate (salt, ctext);
+ *
+ * This version is designed to not allow any NIF to run for too long,
+ * and has been implemented by David Whitlock and Jason M Barnes.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#include "erl_nif.h"
+#include "erl_blf.h"
+
+#define BCRYPT_MAXSALT 16
+#define BCRYPT_WORDS 6
+#define	BCRYPT_HASHLEN 23
+
+static void secure_bzero(void *, size_t);
+
+static ERL_NIF_TERM bf_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+	ErlNifBinary state;
+	char key[1024];
+	char salt[1024];
+	uint8_t key_len;
+	unsigned long key_len_arg;
+	uint8_t salt_len;
+
+	if (argc != 3 || !enif_get_string(env, argv[0], key, sizeof(key), ERL_NIF_LATIN1) ||
+			!enif_get_ulong(env, argv[1], &key_len_arg) ||
+			!enif_get_string(env, argv[2], salt, sizeof(salt), ERL_NIF_LATIN1))
+		return enif_make_badarg(env);
+	key_len = key_len_arg;
+	salt_len = BCRYPT_MAXSALT;
+
+	if (!enif_alloc_binary(sizeof(blf_ctx), &state))
+		return enif_make_badarg(env);
+
+	Blowfish_initstate((blf_ctx *) state.data);
+	Blowfish_expandstate((blf_ctx *) state.data, (uint8_t *) salt,
+			salt_len, (uint8_t *) key, key_len);
+
+	return enif_make_binary(env, &state);
+}
+
+static ERL_NIF_TERM bf_expand0(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+	ErlNifBinary state;
+	char key[1024];
+	unsigned int key_len;
+
+	if (argc != 3 || !enif_inspect_binary(env, argv[0], &state) ||
+			!enif_get_string(env, argv[1], key, sizeof(key), ERL_NIF_LATIN1) ||
+			!enif_get_uint(env, argv[2], &key_len))
+		return enif_make_badarg(env);
+
+	Blowfish_expand0state((blf_ctx *) state.data, (uint8_t *) key, (uint8_t) key_len);
+
+	return enif_make_binary(env, &state);
+}
+
+static ERL_NIF_TERM bf_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+	ErlNifBinary state;
+	uint32_t i, k, m;
+	uint16_t j;
+	uint8_t ciphertext[4 * BCRYPT_WORDS] = "OrpheanBeholderScryDoubt";
+	uint32_t cdata[BCRYPT_WORDS];
+	ERL_NIF_TERM encrypted[4 * BCRYPT_WORDS];
+
+	/* Initialize our data from argv */
+	if (argc != 1 || !enif_inspect_binary(env, argv[0], &state))
+		return enif_make_badarg(env);
+
+	/* This can be precomputed later */
+	j = 0;
+	for (i = 0; i < BCRYPT_WORDS; i++)
+		cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_WORDS, &j);
+
+	/* Now do the encryption */
+	for (k = 0; k < 64; k++)
+		blf_enc((blf_ctx *) state.data, cdata, BCRYPT_WORDS / 2);
+
+	for (i = 0; i < BCRYPT_WORDS; i++) {
+		ciphertext[4 * i + 3] = cdata[i] & 0xff;
+		cdata[i] = cdata[i] >> 8;
+		ciphertext[4 * i + 2] = cdata[i] & 0xff;
+		cdata[i] = cdata[i] >> 8;
+		ciphertext[4 * i + 1] = cdata[i] & 0xff;
+		cdata[i] = cdata[i] >> 8;
+		ciphertext[4 * i + 0] = cdata[i] & 0xff;
+	}
+
+	for (m = 0; m < BCRYPT_HASHLEN; m++) {
+		encrypted[m] = enif_make_uint(env, ciphertext[m]);
+	}
+	secure_bzero(state.data, state.size);
+	enif_release_binary(&state);
+	secure_bzero(ciphertext, sizeof(ciphertext));
+	secure_bzero(cdata, sizeof(cdata));
+	return enif_make_list_from_array(env, encrypted, BCRYPT_HASHLEN);
+}
+
+/*
+ * A typical memset() or bzero() call can be optimized away due to "dead store
+ * elimination" by sufficiently intelligent compilers.  This is a problem for
+ * the above bf_encrypt() function which tries to zero-out several temporary
+ * buffers before returning.  If these calls get optimized away, then these
+ * buffers might leave sensitive information behind.  There are currently no
+ * standard, portable functions to handle this issue -- thus the
+ * implementation below.
+ *
+ * This function cannot be optimized away by dead store elimination, but it
+ * will be slower than a normal memset() or bzero() call.  Given that the
+ * bcrypt algorithm is designed to consume a large amount of time, the change
+ * will likely be negligible.
+ */
+static void secure_bzero(void *buf, size_t len)
+{
+	if (buf == NULL || len == 0) {
+		return;
+	}
+
+	volatile unsigned char *ptr = buf;
+	while (len--) {
+		*ptr++ = 0;
+	}
+}
+
+static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)
+{
+	return 0;
+}
+
+static ErlNifFunc bcrypt_nif_funcs[] =
+{
+	{"bf_init", 3, bf_init},
+	{"bf_expand0", 3, bf_expand0},
+	{"bf_encrypt", 1, bf_encrypt}
+};
+
+ERL_NIF_INIT(Elixir.Bcrypt.Base, bcrypt_nif_funcs, NULL, NULL, upgrade, NULL)
diff --git a/c_src/blowfish.c b/c_src/blowfish.c
new file mode 100644
index 0000000..ef560fc
--- /dev/null
+++ b/c_src/blowfish.c
@@ -0,0 +1,470 @@
+/* $OpenBSD: blowfish.c,v 1.18 2004/11/02 17:23:26 hshoexer Exp $ */
+/*
+ * Blowfish block cipher for OpenBSD
+ * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
+ * All rights reserved.
+ *
+ * Implementation advice by David Mazieres <dm@lcs.mit.edu>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Niels Provos.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This code is derived from section 14.3 and the given source
+ * in section V of Applied Cryptography, second edition.
+ * Blowfish is an unpatented fast block cipher designed by
+ * Bruce Schneier.
+ */
+
+#include <sys/types.h>
+#include "erl_blf.h"
+
+/* Function for Feistel Networks */
+
+#define F(s, x) ((((s)[        (((x)>>24)&0xFF)]  \
+		 + (s)[0x100 + (((x)>>16)&0xFF)]) \
+		 ^ (s)[0x200 + (((x)>> 8)&0xFF)]) \
+		 + (s)[0x300 + ( (x)     &0xFF)])
+
+#define BLFRND(s,p,i,j,n) (i ^= F(s,j) ^ (p)[n])
+
+void
+Blowfish_encipher(blf_ctx *c, uint32_t *xl, uint32_t *xr)
+{
+	uint32_t Xl;
+	uint32_t Xr;
+	uint32_t *s = c->S[0];
+	uint32_t *p = c->P;
+
+	Xl = *xl;
+	Xr = *xr;
+
+	Xl ^= p[0];
+	BLFRND(s, p, Xr, Xl, 1); BLFRND(s, p, Xl, Xr, 2);
+	BLFRND(s, p, Xr, Xl, 3); BLFRND(s, p, Xl, Xr, 4);
+	BLFRND(s, p, Xr, Xl, 5); BLFRND(s, p, Xl, Xr, 6);
+	BLFRND(s, p, Xr, Xl, 7); BLFRND(s, p, Xl, Xr, 8);
+	BLFRND(s, p, Xr, Xl, 9); BLFRND(s, p, Xl, Xr, 10);
+	BLFRND(s, p, Xr, Xl, 11); BLFRND(s, p, Xl, Xr, 12);
+	BLFRND(s, p, Xr, Xl, 13); BLFRND(s, p, Xl, Xr, 14);
+	BLFRND(s, p, Xr, Xl, 15); BLFRND(s, p, Xl, Xr, 16);
+
+	*xl = Xr ^ p[17];
+	*xr = Xl;
+}
+
+void
+Blowfish_initstate(blf_ctx *c)
+{
+	/* P-box and S-box tables initialized with digits of Pi */
+
+	static const blf_ctx initstate =
+	{ {
+		{
+			0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7,
+			0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
+			0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
+			0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
+			0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee,
+			0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
+			0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef,
+			0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
+			0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
+			0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
+			0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce,
+			0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
+			0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e,
+			0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
+			0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
+			0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
+			0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88,
+			0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
+			0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e,
+			0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
+			0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
+			0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
+			0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88,
+			0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
+			0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6,
+			0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
+			0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
+			0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
+			0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba,
+			0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
+			0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f,
+			0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
+			0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
+			0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
+			0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279,
+			0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
+			0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab,
+			0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
+			0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
+			0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
+			0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0,
+			0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
+			0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790,
+			0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
+			0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
+			0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
+			0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7,
+			0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
+			0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad,
+			0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
+			0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
+			0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
+			0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477,
+			0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
+			0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49,
+			0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
+			0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
+			0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
+			0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41,
+			0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
+			0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400,
+			0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
+			0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
+		0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a},
+		{
+			0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623,
+			0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
+			0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
+			0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
+			0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
+			0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
+			0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e,
+			0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
+			0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
+			0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
+			0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
+			0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
+			0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701,
+			0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
+			0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
+			0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
+			0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
+			0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
+			0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e,
+			0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
+			0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
+			0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
+			0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
+			0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
+			0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b,
+			0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
+			0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
+			0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
+			0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
+			0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
+			0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4,
+			0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
+			0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
+			0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
+			0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
+			0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
+			0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510,
+			0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
+			0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
+			0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
+			0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
+			0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
+			0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8,
+			0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
+			0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
+			0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
+			0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
+			0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
+			0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0,
+			0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
+			0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
+			0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
+			0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
+			0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
+			0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00,
+			0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
+			0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
+			0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
+			0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
+			0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
+			0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
+			0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
+			0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
+		0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7},
+		{
+			0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,
+			0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
+			0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
+			0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
+			0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45,
+			0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
+			0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
+			0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
+			0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
+			0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
+			0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42,
+			0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
+			0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
+			0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
+			0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
+			0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
+			0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33,
+			0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
+			0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
+			0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
+			0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
+			0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
+			0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b,
+			0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
+			0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
+			0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
+			0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
+			0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
+			0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37,
+			0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
+			0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
+			0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
+			0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
+			0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
+			0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d,
+			0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
+			0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
+			0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
+			0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
+			0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
+			0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d,
+			0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
+			0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
+			0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
+			0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
+			0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
+			0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2,
+			0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
+			0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
+			0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
+			0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
+			0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
+			0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52,
+			0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
+			0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
+			0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
+			0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
+			0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
+			0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24,
+			0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
+			0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
+			0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
+			0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
+		0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0},
+		{
+			0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b,
+			0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
+			0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
+			0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
+			0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8,
+			0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
+			0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304,
+			0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
+			0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
+			0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
+			0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9,
+			0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
+			0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593,
+			0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
+			0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
+			0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
+			0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b,
+			0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
+			0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c,
+			0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
+			0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
+			0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
+			0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb,
+			0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
+			0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991,
+			0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
+			0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
+			0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
+			0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae,
+			0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
+			0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5,
+			0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
+			0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
+			0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
+			0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84,
+			0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
+			0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8,
+			0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
+			0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
+			0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
+			0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38,
+			0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
+			0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c,
+			0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
+			0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
+			0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
+			0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964,
+			0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
+			0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8,
+			0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
+			0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
+			0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
+			0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02,
+			0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
+			0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614,
+			0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
+			0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
+			0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
+			0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0,
+			0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
+			0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e,
+			0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
+			0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
+		0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6}
+	},
+	{
+		0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
+		0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
+		0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
+		0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
+		0x9216d5d9, 0x8979fb1b
+	} };
+
+	*c = initstate;
+}
+
+uint32_t
+Blowfish_stream2word(const uint8_t *data, uint16_t databytes,
+    uint16_t *current)
+{
+	uint8_t i;
+	uint16_t j;
+	uint32_t temp;
+
+	temp = 0x00000000;
+	j = *current;
+
+	for (i = 0; i < 4; i++, j++) {
+		if (j >= databytes)
+			j = 0;
+		temp = (temp << 8) | data[j];
+	}
+
+	*current = j;
+	return temp;
+}
+
+void
+Blowfish_expand0state(blf_ctx *c, const uint8_t *key, uint16_t keybytes)
+{
+	uint16_t i;
+	uint16_t j;
+	uint16_t k;
+	uint32_t temp;
+	uint32_t datal;
+	uint32_t datar;
+
+	j = 0;
+	for (i = 0; i < BLF_N + 2; i++) {
+		/* Extract 4 int8 to 1 int32 from keystream */
+		temp = Blowfish_stream2word(key, keybytes, &j);
+		c->P[i] = c->P[i] ^ temp;
+	}
+
+	j = 0;
+	datal = 0x00000000;
+	datar = 0x00000000;
+	for (i = 0; i < BLF_N + 2; i += 2) {
+		Blowfish_encipher(c, &datal, &datar);
+
+		c->P[i] = datal;
+		c->P[i + 1] = datar;
+	}
+
+	for (i = 0; i < 4; i++) {
+		for (k = 0; k < 256; k += 2) {
+			Blowfish_encipher(c, &datal, &datar);
+
+			c->S[i][k] = datal;
+			c->S[i][k + 1] = datar;
+		}
+	}
+}
+
+void
+Blowfish_expandstate(blf_ctx *c, const uint8_t *data, uint16_t databytes,
+    const uint8_t *key, uint16_t keybytes)
+{
+	uint16_t i;
+	uint16_t j;
+	uint16_t k;
+	uint32_t temp;
+	uint32_t datal;
+	uint32_t datar;
+
+	j = 0;
+	for (i = 0; i < BLF_N + 2; i++) {
+		/* Extract 4 int8 to 1 int32 from keystream */
+		temp = Blowfish_stream2word(key, keybytes, &j);
+		c->P[i] = c->P[i] ^ temp;
+	}
+
+	j = 0;
+	datal = 0x00000000;
+	datar = 0x00000000;
+	for (i = 0; i < BLF_N + 2; i += 2) {
+		datal ^= Blowfish_stream2word(data, databytes, &j);
+		datar ^= Blowfish_stream2word(data, databytes, &j);
+		Blowfish_encipher(c, &datal, &datar);
+
+		c->P[i] = datal;
+		c->P[i + 1] = datar;
+	}
+
+	for (i = 0; i < 4; i++) {
+		for (k = 0; k < 256; k += 2) {
+			datal ^= Blowfish_stream2word(data, databytes, &j);
+			datar ^= Blowfish_stream2word(data, databytes, &j);
+			Blowfish_encipher(c, &datal, &datar);
+
+			c->S[i][k] = datal;
+			c->S[i][k + 1] = datar;
+		}
+	}
+
+}
+
+void
+blf_enc(blf_ctx *c, uint32_t *data, uint16_t blocks)
+{
+	uint32_t *d;
+	uint16_t i;
+
+	d = data;
+	for (i = 0; i < blocks; i++) {
+		Blowfish_encipher(c, d, d + 1);
+		d += 2;
+	}
+}
diff --git a/c_src/erl_blf.h b/c_src/erl_blf.h
new file mode 100644
index 0000000..6ccba60
--- /dev/null
+++ b/c_src/erl_blf.h
@@ -0,0 +1,68 @@
+/* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk Exp $ */
+/*
+ * Blowfish - a fast block cipher designed by Bruce Schneier
+ *
+ * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Niels Provos.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _ERL_BLF_H_
+#define _ERL_BLF_H_
+
+#include <stdint.h>
+
+/* Schneier specifies a maximum key length of 56 bytes.
+ * This ensures that every key bit affects every cipher
+ * bit.  However, the subkeys can hold up to 72 bytes.
+ * Warning: For normal blowfish encryption only 56 bytes
+ * of the key affect all cipherbits.
+ */
+
+#define BLF_N	16			/* Number of Subkeys */
+#define BLF_MAXKEYLEN ((BLF_N-2)*4)	/* 448 bits */
+#define BLF_MAXUTILIZED ((BLF_N+2)*4)	/* 576 bits */
+
+#define _PASSWORD_LEN   128             /* max length, not counting NUL */
+
+/* Blowfish context */
+typedef struct BlowfishContext {
+    uint32_t S[4][256];	/* S-Boxes */
+    uint32_t P[BLF_N + 2];	/* Subkeys */
+} blf_ctx;
+
+void Blowfish_encipher(blf_ctx *, uint32_t *, uint32_t *);
+void Blowfish_initstate(blf_ctx *);
+void Blowfish_expand0state(blf_ctx *, const uint8_t *, uint16_t);
+void Blowfish_expandstate
+(blf_ctx *, const uint8_t *, uint16_t, const uint8_t *, uint16_t);
+void blf_enc(blf_ctx *, uint32_t *, uint16_t);
+
+/* Converts uint8_t to uint32_t */
+uint32_t Blowfish_stream2word(const uint8_t *, uint16_t , uint16_t *);
+
+#endif
diff --git a/lib/bcrypt.ex b/lib/bcrypt.ex
new file mode 100644
index 0000000..cbe7fed
--- /dev/null
+++ b/lib/bcrypt.ex
@@ -0,0 +1,72 @@
+defmodule Bcrypt do
+  @moduledoc """
+  """
+
+  alias Bcrypt.{Base, Base64}
+
+  @log_rounds 12
+
+  @doc """
+  Generate a salt for use with the `hashpass` function.
+
+  The log_rounds parameter determines the computational complexity
+  of the generation of the password hash. Its default is 12, the minimum is 4,
+  and the maximum is 31.
+
+  The `legacy` option is for generating salts with the old `$2a$` prefix.
+  Only use this option if you need to generate hashes that are then checked
+  by older libraries.
+  """
+  def gen_salt(log_rounds \\ @log_rounds, legacy \\ false)
+  def gen_salt(log_rounds, _) when not is_integer(log_rounds) do
+    raise ArgumentError, "Wrong type - log_rounds should be an integer between 4 and 31"
+  end
+  def gen_salt(log_rounds, legacy) when log_rounds in 4..31 do
+    :crypto.strong_rand_bytes(16)
+    |> :binary.bin_to_list
+    |> fmt_salt(zero_str(log_rounds), legacy)
+  end
+  def gen_salt(log_rounds, legacy) when log_rounds < 4, do: gen_salt(4, legacy)
+  def gen_salt(log_rounds, legacy) when log_rounds > 31, do: gen_salt(31, legacy)
+
+  @doc """
+  Hash the password with a salt which is randomly generated.
+
+  To change the complexity (and the time taken) of the  password hash
+  calculation, you need to change the value for `bcrypt_log_rounds`
+  in the config file.
+  """
+  def hash_pwd_salt(password, opts \\ []) do
+    Base.hash_password(password, Keyword.get(opts, :log_rounds, @log_rounds) |> gen_salt)
+  end
+
+  @doc """
+  Check the password.
+
+  The check is performed in constant time to avoid timing attacks.
+  """
+  def verify_hash(stored_hash, password) when is_binary(stored_hash) do
+    Base.verify_hash(stored_hash, password)
+  end
+  def verify_hash(_, _) do
+    raise ArgumentError, "Wrong type - the password and hash need to be strings"
+  end
+
+  @doc """
+  Perform a dummy check for a user that does not exist.
+
+  This always returns false. The reason for implementing this check is
+  in order to make user enumeration by timing responses more difficult.
+  """
+  def no_user_verify(opts) do
+    hash_pwd_salt("password", opts)
+    false
+  end
+
+  defp zero_str(log_rounds) do
+    if log_rounds < 10, do: "0#{log_rounds}", else: "#{log_rounds}"
+  end
+
+  defp fmt_salt(salt, log_rounds, false), do: "$2b$#{log_rounds}$#{Base64.encode(salt)}"
+  defp fmt_salt(salt, log_rounds, true), do: "$2a$#{log_rounds}$#{Base64.encode(salt)}"
+end
diff --git a/lib/bcrypt/base.ex b/lib/bcrypt/base.ex
new file mode 100644
index 0000000..cb75b0d
--- /dev/null
+++ b/lib/bcrypt/base.ex
@@ -0,0 +1,92 @@
+defmodule Bcrypt.Base do
+  @moduledoc """
+  """
+
+  use Bitwise
+  alias Bcrypt.{Base64, Tools}
+
+  @salt_len 16
+
+  @compile {:autoload, false}
+  @on_load {:init, 0}
+
+  def init do
+    path = :filename.join(:code.priv_dir(:bcrypt_elixir), 'bcrypt_nif')
+    :erlang.load_nif(path, 0)
+  end
+
+  @doc """
+  Hash a password using Bcrypt.
+  """
+  def hash_password(password, salt)
+      when is_binary(password) and is_binary(salt) and byte_size(salt) == 29 do
+    hashpw(:binary.bin_to_list(password), :binary.bin_to_list(salt))
+  end
+  def hash_password(_, _) do
+    raise ArgumentError, "The password and salt should be strings and " <>
+      "the salt (before encoding) should be 16 bytes long"
+  end
+
+  def verify_hash(stored_hash, password) do
+    hashpw(:binary.bin_to_list(password), :binary.bin_to_list(stored_hash))
+    |> Tools.secure_check(stored_hash)
+  end
+
+  @doc """
+  Initialize the P-box and S-box tables with the digits of Pi,
+  and then start the key expansion process.
+  """
+  def bf_init(key, key_len, salt)
+  def bf_init(_, _, _), do: :erlang.nif_error(:not_loaded)
+
+  @doc """
+  The main key expansion function.
+  """
+  def bf_expand0(state, input, input_len)
+  def bf_expand0(_, _, _), do: :erlang.nif_error(:not_loaded)
+
+  @doc """
+  Encrypt and return the hash.
+  """
+  def bf_encrypt(state)
+  def bf_encrypt(_), do: :erlang.nif_error(:not_loaded)
+
+  defp hashpw(password, salt) do
+    [prefix, log_rounds, salt] = Enum.take(salt, 29) |> :string.tokens('$')
+    bcrypt(password, salt, prefix, log_rounds)
+    |> fmt_hash(salt, prefix, zero_str(log_rounds))
+  end
+
+  defp bcrypt(key, salt, prefix, log_rounds) when prefix in ['2b', '2a'] do
+    key_len = if prefix == '2b' and length(key) > 72, do: 73, else: length(key) + 1
+    {salt, rounds} = prepare_keys(salt, List.to_integer(log_rounds))
+    bf_init(key, key_len, salt)
+    |> expand_keys(key, key_len, salt, rounds)
+    |> bf_encrypt
+  end
+  defp bcrypt(_, _, prefix, _) do
+    raise ArgumentError, "Bcrypt does not support the #{prefix} prefix"
+  end
+
+  defp prepare_keys(salt, log_rounds) when log_rounds in 4..31 do
+    {Base64.decode(salt), bsl(1, log_rounds)}
+  end
+  defp prepare_keys(_, _) do
+    raise ArgumentError, "Wrong number of rounds"
+  end
+
+  defp expand_keys(state, _key, _key_len, _salt, 0), do: state
+  defp expand_keys(state, key, key_len, salt, rounds) do
+    bf_expand0(state, key, key_len)
+    |> bf_expand0(salt, @salt_len)
+    |> expand_keys(key, key_len, salt, rounds - 1)
+  end
+
+  defp zero_str(log_rounds) do
+    if log_rounds < 10, do: "0#{log_rounds}", else: "#{log_rounds}"
+  end
+
+  defp fmt_hash(hash, salt, prefix, log_rounds) do
+    "$#{prefix}$#{log_rounds}$#{salt}#{Base64.encode(hash)}"
+  end
+end
diff --git a/lib/bcrypt/base64.ex b/lib/bcrypt/base64.ex
new file mode 100644
index 0000000..eae1a19
--- /dev/null
+++ b/lib/bcrypt/base64.ex
@@ -0,0 +1,102 @@
+defmodule Bcrypt.Base64 do
+  @moduledoc """
+  Module that provides base64 encoding for bcrypt.
+
+  Bcrypt uses an adapted base64 alphabet (using `.` instead of `+`,
+  starting with `./` and with no padding).
+  """
+
+  use Bitwise
+
+  @decode_map {:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:ws,:ws,:bad,:bad,:ws,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :ws,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,0,1,
+    54,55,56,57,58,59,60,61,62,63,:bad,:bad,:bad,:eq,:bad,:bad,
+    :bad,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
+    17,18,19,20,21,22,23,24,25,26,27,:bad,:bad,:bad,:bad,:bad,
+    :bad,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,
+    43,44,45,46,47,48,49,50,51,52,53,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,
+    :bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad,:bad}
+
+  @doc """
+  Encode using the adapted Bcrypt alphabet.
+
+  ## Examples
+
+      iex> Bcrypt.Base64.encode 'spamandeggs'
+      'a1/fZUDsXETlX1K'
+  """
+  def encode(words), do: encode_l(words)
+
+  @doc """
+  Decode using the adapted Bcrypt alphabet.
+
+  ## Examples
+
+      iex> Bcrypt.Base64.decode 'a1/fZUDsXETlX1K'
+      'spamandeggs'
+  """
+  def decode(words), do: decode_l(words, [])
+
+  defp b64e(val) do
+    elem({?., ?/, ?A, ?B, ?C, ?D, ?E, ?F, ?G, ?H, ?I, ?J, ?K, ?L,
+      ?M, ?N, ?O, ?P, ?Q, ?R, ?S, ?T, ?U, ?V, ?W, ?X,
+      ?Y, ?Z, ?a, ?b, ?c, ?d, ?e, ?f, ?g, ?h, ?i, ?j, ?k, ?l,
+      ?m, ?n, ?o, ?p, ?q, ?r, ?s, ?t, ?u, ?v, ?w, ?x,
+      ?y, ?z, ?0, ?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9}, val)
+  end
+
+  defp encode_l([]), do: []
+  defp encode_l([a]) do
+    [b64e(a >>> 2),
+      b64e((a &&& 3) <<< 4)]
+  end
+  defp encode_l([a,b]) do
+    [b64e(a >>> 2),
+      b64e(((a &&& 3) <<< 4) ||| (b >>> 4)),
+      b64e((b &&& 15) <<< 2)]
+  end
+  defp encode_l([a,b,c|ls]) do
+    bb = (a <<< 16) ||| (b <<< 8) ||| c
+    [b64e(bb >>> 18),
+      b64e((bb >>> 12) &&& 63),
+      b64e((bb >>> 6) &&& 63),
+      b64e(bb &&& 63) | encode_l(ls)]
+  end
+
+  defp decode_l([], a), do: a
+  defp decode_l([c1,c2], a) do
+    bits2x6 = (b64d(c1) <<< 18) ||| (b64d(c2) <<< 12)
+    octet1 = bits2x6 >>> 16
+    a ++ [octet1]
+  end
+  defp decode_l([c1,c2,c3], a) do
+    bits3x6 = (b64d(c1) <<< 18) ||| (b64d(c2) <<< 12) ||| (b64d(c3) <<< 6)
+    octet1 = bits3x6 >>> 16
+    octet2 = (bits3x6 >>> 8) &&& 0xff
+    a ++ [octet1,octet2]
+  end
+  defp decode_l([c1,c2,c3,c4| cs], a) do
+    bits4x6 = (b64d(c1) <<< 18) ||| (b64d(c2) <<< 12) ||| (b64d(c3) <<< 6) ||| b64d(c4)
+    octet1 = bits4x6 >>> 16
+    octet2 = (bits4x6 >>> 8) &&& 0xff
+    octet3 = bits4x6 &&& 0xff
+    decode_l(cs, a ++ [octet1,octet2,octet3])
+  end
+
+  defp b64d(val) do
+    b64d_ok(elem(@decode_map, val))
+  end
+
+  defp b64d_ok(val) when is_integer(val), do: val
+  defp b64d_ok(val) do
+    raise ArgumentError, "Invalid character: #{val}"
+  end
+end
diff --git a/lib/bcrypt/stats.ex b/lib/bcrypt/stats.ex
new file mode 100644
index 0000000..9a1a72d
--- /dev/null
+++ b/lib/bcrypt/stats.ex
@@ -0,0 +1,35 @@
+defmodule Bcrypt.Stats do
+  @moduledoc """
+  Module to provide statistics for the Bcrypt password hashing function.
+  """
+
+  @doc """
+  Hash a password with Bcrypt and print out a report.
+
+  This function hashes a password, and salt, with Bcrypt.Base.hash_password/2
+  and prints out statistics which can help you choose how many log rounds to use
+  with Bcrypt.
+  """
+  def report(opts \\ []) do
+    password = Keyword.get(opts, :password, "password")
+    log_rounds = Keyword.get(opts, :log_rounds, 12)
+    salt = Keyword.get(opts, :salt, Bcrypt.gen_salt(log_rounds))
+    {exec_time, encoded} = :timer.tc(Bcrypt.Base, :hash_password, [password, salt])
+    Bcrypt.verify_hash(encoded, password)
+    |> format_result(encoded, exec_time)
+  end
+
+  defp format_result(check, encoded, exec_time) do
+    log_rounds = String.slice(encoded, 4..5)
+    IO.puts """
+    Hash: #{encoded}
+    Log rounds: #{log_rounds}
+    #{format_time(exec_time)} seconds
+    Verification #{if check, do: "ok", else: "failed"}
+    """
+  end
+
+  defp format_time(time) do
+    Float.round(time / 1_000_000, 2)
+  end
+end
diff --git a/lib/bcrypt/tools.ex b/lib/bcrypt/tools.ex
new file mode 100644
index 0000000..451309a
--- /dev/null
+++ b/lib/bcrypt/tools.ex
@@ -0,0 +1,24 @@
+defmodule Bcrypt.Tools do
+  @moduledoc """
+  Module that provides various tools for the hashing algorithms.
+  """
+
+  use Bitwise
+
+  @doc """
+  Compares the two binaries in constant time to avoid timing attacks.
+  """
+  def secure_check(hash, stored) do
+    if byte_size(hash) == byte_size(stored) do
+      secure_check(hash, stored, 0) == 0
+    else
+      false
+    end
+  end
+  defp secure_check(<<h, rest_h :: binary>>, <<s, rest_s :: binary>>, acc) do
+    secure_check(rest_h, rest_s, acc ||| (h ^^^ s))
+  end
+  defp secure_check("", "", acc) do
+    acc
+  end
+end
diff --git a/mix.exs b/mix.exs
new file mode 100644
index 0000000..385522e
--- /dev/null
+++ b/mix.exs
@@ -0,0 +1,45 @@
+defmodule BcryptElixir.Mixfile do
+  use Mix.Project
+
+  @version "0.1.0"
+
+  @description """
+  Bcrypt password hashing algorithm for Elixir
+  """
+
+  def project do
+    [
+      app: :bcrypt_elixir,
+      version: @version,
+      elixir: "~> 1.4",
+      start_permanent: Mix.env == :prod,
+      compilers: [:elixir_make] ++ Mix.compilers,
+      description: @description,
+      package: package(),
+      source_url: "https://github.com/riverrun/bcrypt_elixir",
+      deps: deps()
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:elixir_make, "~> 0.4", runtime: false},
+      {:earmark, "~> 1.2", only: :dev},
+      {:ex_doc,  "~> 0.15", only: :dev}
+    ]
+  end
+
+  defp package do
+    [files: ["lib", "c_src", "mix.exs", "Makefile*", "README.md"],
+     maintainers: ["David Whitlock"],
+     licenses: ["Apache 2.0"],
+     links: %{"GitHub" => "https://github.com/riverrun/argon2_elixir",
+       "Docs" => "http://hexdocs.pm/argon2_elixir"}]
+  end
+end
diff --git a/mix.lock b/mix.lock
new file mode 100644
index 0000000..5599de4
--- /dev/null
+++ b/mix.lock
@@ -0,0 +1,3 @@
+%{"earmark": {:hex, :earmark, "1.2.2", "f718159d6b65068e8daeef709ccddae5f7fdc770707d82e7d126f584cd925b74", [:mix], []},
+  "elixir_make": {:hex, :elixir_make, "0.4.0", "992f38fabe705bb45821a728f20914c554b276838433349d4f2341f7a687cddf", [:mix], []},
+  "ex_doc": {:hex, :ex_doc, "0.16.2", "3b3e210ebcd85a7c76b4e73f85c5640c011d2a0b2f06dcdf5acdb2ae904e5084", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, optional: false]}]}}
diff --git a/test/base64_test.exs b/test/base64_test.exs
new file mode 100644
index 0000000..f0c35ad
--- /dev/null
+++ b/test/base64_test.exs
@@ -0,0 +1,5 @@
+defmodule Bcrypt.Base64Test do
+  use ExUnit.Case
+  doctest Bcrypt.Base64
+
+end
diff --git a/test/base_test.exs b/test/base_test.exs
new file mode 100644
index 0000000..87fdcf4
--- /dev/null
+++ b/test/base_test.exs
@@ -0,0 +1,113 @@
+defmodule Bcrypt.BaseTest do
+  use ExUnit.Case
+
+  alias Bcrypt.Base
+
+  def check_vectors(data) do
+    for {password, salt, stored_hash} <- data do
+      assert Base.hash_password(password, salt) == stored_hash
+    end
+  end
+
+  test "Openwall Bcrypt tests" do
+    [
+      {"U*U",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.E5YPO9kmyuRGyh0XouQYb4YMJKvyOeW"},
+      {"U*U*",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.VGOzA784oUp/Z0DY336zx7pLYAy0lwK"},
+      {"U*U*U",
+        "$2a$05$XXXXXXXXXXXXXXXXXXXXXO",
+        "$2a$05$XXXXXXXXXXXXXXXXXXXXXOAcXxm9kjPGEMsLznoKqmqw7tc8WCx4a"},
+      {"",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.7uG0VCzI2bS7j6ymqJi9CdcdxiRTWNy"},
+      {"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
+        "$2a$05$abcdefghijklmnopqrstuu",
+        "$2a$05$abcdefghijklmnopqrstuu5s2v8.iXieOjg/.AySBTTZIIVFJeBui"}
+    ] |> check_vectors
+  end
+
+  test "OpenBSD Bcrypt tests" do
+    [
+      {<<0xa3>>,
+        "$2b$05$/OK.fbVrR/bpIqNJ5ianF.",
+        "$2b$05$/OK.fbVrR/bpIqNJ5ianF.Sa7shbm4.OzKpvFnX1pQLmQW96oUlCq"},
+      {<<0xa3>>,
+        "$2a$05$/OK.fbVrR/bpIqNJ5ianF.",
+        "$2a$05$/OK.fbVrR/bpIqNJ5ianF.Sa7shbm4.OzKpvFnX1pQLmQW96oUlCq"},
+      {<<0xff, 0xff, 0xa3>>,
+        "$2b$05$/OK.fbVrR/bpIqNJ5ianF.",
+        "$2b$05$/OK.fbVrR/bpIqNJ5ianF.CE5elHaaO4EbggVDjb8P19RukzXSM3e"},
+      {"000000000000000000000000000000000000000000000000000000000000000000000000",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.6.O1dLNbjod2uo0DVcW.jHucKbPDdHS"},
+      {"000000000000000000000000000000000000000000000000000000000000000000000000",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.6.O1dLNbjod2uo0DVcW.jHucKbPDdHS"}
+    ] |> check_vectors
+  end
+
+  test "Long password $2b$ prefix tests" do
+    [
+      {"01234567890123456789012345678901234567890123456789012345678901234567890123456789" <>
+        "0123456789012345678901234567890123456789012345678901234567890123456789012345678" <>
+          "901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.XxrQqgBi/5Sxuq9soXzDtjIZ7w5pMfK"},
+      {"01234567890123456789012345678901234567890123456789012345678901234567890123456789" <>
+        "0123456789012345678901234567890123456789012345678901234567890123456789012345678" <>
+          "9012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2b$05$CCCCCCCCCCCCCCCCCCCCC.XxrQqgBi/5Sxuq9soXzDtjIZ7w5pMfK"}
+    ] |> check_vectors
+  end
+
+  test "Long password old $2a$ prefix tests" do
+    [
+      {"01234567890123456789012345678901234567890123456789012345678901234567890123456789" <>
+        "0123456789012345678901234567890123456789012345678901234567890123456789012345678" <>
+          "901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.6.O1dLNbjod2uo0DVcW.jHucKbPDdHS"},
+      {"01234567890123456789012345678901234567890123456789012345678901234567890123456789" <>
+        "0123456789012345678901234567890123456789012345678901234567890123456789012345678" <>
+          "9012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.",
+        "$2a$05$CCCCCCCCCCCCCCCCCCCCC.6.O1dLNbjod2uo0DVcW.jHucKbPDdHS"}
+    ] |> check_vectors
+  end
+
+  test "known non-ascii characters tests" do
+    [
+      {"ππππππππ",
+        "$2a$10$.TtQJ4Jr6isd4Hp.mVfZeu",
+        "$2a$10$.TtQJ4Jr6isd4Hp.mVfZeuh6Gws4rOQ/vdBczhDx.19NFK0Y84Dle"}
+    ] |> check_vectors
+  end
+
+  test "Consistency tests" do
+    [
+      {"p@5sw0rd",
+        "$2b$12$zQ4CooEXdGqcwi0PHsgc8e",
+        "$2b$12$zQ4CooEXdGqcwi0PHsgc8eAf0DLXE/XHoBE8kCSGQ97rXwuClaPam"},
+      {"C'est bon, la vie!",
+        "$2b$12$cbo7LZ.wxgW4yxAA5Vqlv.",
+        "$2b$12$cbo7LZ.wxgW4yxAA5Vqlv.KR6QFPt4qCdc9RYJNXxa/rbUOp.1sw."},
+      {"ἓν οἶδα ὅτι οὐδὲν οἶδα",
+        "$2b$12$LeHKWR2bmrazi/6P22Jpau",
+        "$2b$12$LeHKWR2bmrazi/6P22JpauX5my/eKwwKpWqL7L5iEByBnxNc76FRW"}
+    ] |> check_vectors
+  end
+
+  test "raise error if salt has unsupported prefix" do
+    assert_raise ArgumentError, "Bcrypt does not support the 2x prefix", fn ->
+      Base.hash_password("U*U", "$2x$05$CCCCCCCCCCCCCCCCCCCCC.")
+    end
+    assert_raise ArgumentError, "Bcrypt does not support the 2y prefix", fn ->
+      Base.hash_password("U*U", "$2y$05$CCCCCCCCCCCCCCCCCCCCC.")
+    end
+  end
+
+end
diff --git a/test/bcrypt_test.exs b/test/bcrypt_test.exs
new file mode 100644
index 0000000..8a378e2
--- /dev/null
+++ b/test/bcrypt_test.exs
@@ -0,0 +1,4 @@
+defmodule BcryptTest do
+  use ExUnit.Case
+
+end
diff --git a/test/reference_test.exs b/test/reference_test.exs
new file mode 100644
index 0000000..d445504
--- /dev/null
+++ b/test/reference_test.exs
@@ -0,0 +1,20 @@
+defmodule Bcrypt.ReferenceTest do
+  use ExUnit.Case
+
+  alias Bcrypt.Base
+
+  def read_file(filename, digest) do
+    tests = Path.expand("support/#{filename}", __DIR__)
+            |> File.read!
+            |> String.split("\n", trim: true)
+    for t <- tests do
+      [password, salt, iterations, dklen, hash] = String.split(t, ",", trim: true)
+      rounds = String.to_integer(iterations)
+      length = String.to_integer(dklen)
+      assert Base.hash_password(password, salt, rounds: rounds, digest: digest,
+                                length: length, format: :hex) == hash
+    end
+  end
+
+
+end
diff --git a/test/stats_test.exs b/test/stats_test.exs
new file mode 100644
index 0000000..0a3179a
--- /dev/null
+++ b/test/stats_test.exs
@@ -0,0 +1,19 @@
+defmodule Bcrypt.StatsTest do
+  use ExUnit.Case
+
+  import ExUnit.CaptureIO
+  alias Bcrypt.Stats
+
+  test "print report with default options" do
+    report = capture_io(fn -> Stats.report() end)
+    assert report =~ "Log rounds: 12\n"
+    assert report =~ "Verification ok"
+  end
+
+  test "use custom options" do
+    report = capture_io(fn -> Stats.report(log_rounds: 16) end)
+    assert report =~ "Log rounds: 16\n"
+    assert report =~ "Verification ok"
+  end
+
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
new file mode 100644
index 0000000..869559e
--- /dev/null
+++ b/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()