diff --git a/bcrypt.cabal b/bcrypt.cabal
--- a/bcrypt.cabal
+++ b/bcrypt.cabal
@@ -1,5 +1,5 @@
 Name: bcrypt
-Version: 0.0.2
+Version: 0.0.3
 Cabal-Version: >= 1.6
 Build-Type: Simple
 License: BSD3
@@ -15,6 +15,7 @@
 
              The OpenWall version of the C source for bcrypt (modified so it will build on all platforms without any assembler code) is included in this package.
 synopsis: Haskell bindings to the bcrypt password hash
+extra-source-files: csrc/crypt_blowfish.h csrc/crypt_gensalt.h csrc/crypt.h csrc/ow-crypt.h
 
 Library
   exposed-modules: Crypto.BCrypt
diff --git a/csrc/crypt.h b/csrc/crypt.h
new file mode 100644
--- /dev/null
+++ b/csrc/crypt.h
@@ -0,0 +1,24 @@
+/*
+ * Written by Solar Designer <solar at openwall.com> in 2000-2002.
+ * No copyright is claimed, and the software is hereby placed in the public
+ * domain.  In case this attempt to disclaim copyright and place the software
+ * in the public domain is deemed null and void, then the software is
+ * Copyright (c) 2000-2002 Solar Designer and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See crypt_blowfish.c for more information.
+ */
+
+#include <gnu-crypt.h>
+
+#if defined(_OW_SOURCE) || defined(__USE_OW)
+#define __SKIP_GNU
+#undef __SKIP_OW
+#include <ow-crypt.h>
+#undef __SKIP_GNU
+#endif
diff --git a/csrc/crypt_blowfish.h b/csrc/crypt_blowfish.h
new file mode 100644
--- /dev/null
+++ b/csrc/crypt_blowfish.h
@@ -0,0 +1,27 @@
+/*
+ * Written by Solar Designer <solar at openwall.com> in 2000-2011.
+ * No copyright is claimed, and the software is hereby placed in the public
+ * domain.  In case this attempt to disclaim copyright and place the software
+ * in the public domain is deemed null and void, then the software is
+ * Copyright (c) 2000-2011 Solar Designer and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See crypt_blowfish.c for more information.
+ */
+
+#ifndef _CRYPT_BLOWFISH_H
+#define _CRYPT_BLOWFISH_H
+
+extern int _crypt_output_magic(const char *setting, char *output, int size);
+extern char *_crypt_blowfish_rn(const char *key, const char *setting,
+	char *output, int size);
+extern char *_crypt_gensalt_blowfish_rn(const char *prefix,
+	unsigned long count,
+	const char *input, int size, char *output, int output_size);
+
+#endif
diff --git a/csrc/crypt_gensalt.h b/csrc/crypt_gensalt.h
new file mode 100644
--- /dev/null
+++ b/csrc/crypt_gensalt.h
@@ -0,0 +1,30 @@
+/*
+ * Written by Solar Designer <solar at openwall.com> in 2000-2011.
+ * No copyright is claimed, and the software is hereby placed in the public
+ * domain.  In case this attempt to disclaim copyright and place the software
+ * in the public domain is deemed null and void, then the software is
+ * Copyright (c) 2000-2011 Solar Designer and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See crypt_blowfish.c for more information.
+ */
+
+#ifndef _CRYPT_GENSALT_H
+#define _CRYPT_GENSALT_H
+
+extern unsigned char _crypt_itoa64[];
+extern char *_crypt_gensalt_traditional_rn(const char *prefix,
+	unsigned long count,
+	const char *input, int size, char *output, int output_size);
+extern char *_crypt_gensalt_extended_rn(const char *prefix,
+	unsigned long count,
+	const char *input, int size, char *output, int output_size);
+extern char *_crypt_gensalt_md5_rn(const char *prefix, unsigned long count,
+	const char *input, int size, char *output, int output_size);
+
+#endif
diff --git a/csrc/ow-crypt.h b/csrc/ow-crypt.h
new file mode 100644
--- /dev/null
+++ b/csrc/ow-crypt.h
@@ -0,0 +1,43 @@
+/*
+ * Written by Solar Designer <solar at openwall.com> in 2000-2011.
+ * No copyright is claimed, and the software is hereby placed in the public
+ * domain.  In case this attempt to disclaim copyright and place the software
+ * in the public domain is deemed null and void, then the software is
+ * Copyright (c) 2000-2011 Solar Designer and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See crypt_blowfish.c for more information.
+ */
+
+#ifndef _OW_CRYPT_H
+#define _OW_CRYPT_H
+
+#ifndef __GNUC__
+#undef __const
+#define __const const
+#endif
+
+#ifndef __SKIP_GNU
+extern char *crypt(__const char *key, __const char *setting);
+extern char *crypt_r(__const char *key, __const char *setting, void *data);
+#endif
+
+#ifndef __SKIP_OW
+extern char *crypt_rn(__const char *key, __const char *setting,
+	void *data, int size);
+extern char *crypt_ra(__const char *key, __const char *setting,
+	void **data, int *size);
+extern char *crypt_gensalt(__const char *prefix, unsigned long count,
+	__const char *input, int size);
+extern char *crypt_gensalt_rn(__const char *prefix, unsigned long count,
+	__const char *input, int size, char *output, int output_size);
+extern char *crypt_gensalt_ra(__const char *prefix, unsigned long count,
+	__const char *input, int size);
+#endif
+
+#endif