2G ems initial

include/nettle/twofish.h

@@ -0,0 +1,98 @@
+/* twofish.h
+
+   The twofish block cipher.
+
+   Copyright (C) 2001, 2014 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+/*
+ * Twofish is a 128-bit block cipher that accepts a variable-length
+ * key up to 256 bits, designed by Bruce Schneier and others.  See
+ * http://www.counterpane.com/twofish.html for details.
+ */
+
+#ifndef NETTLE_TWOFISH_H_INCLUDED
+#define NETTLE_TWOFISH_H_INCLUDED
+
+#include "nettle-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Name mangling */
+#define twofish_set_key nettle_twofish_set_key
+#define twofish128_set_key nettle_twofish128_set_key
+#define twofish192_set_key nettle_twofish192_set_key
+#define twofish256_set_key nettle_twofish256_set_key
+#define twofish_encrypt nettle_twofish_encrypt
+#define twofish_decrypt nettle_twofish_decrypt
+
+#define TWOFISH_BLOCK_SIZE 16
+
+/* Variable key size between 128 and 256 bits. But the only valid
+ * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
+#define TWOFISH_MIN_KEY_SIZE 16
+#define TWOFISH_MAX_KEY_SIZE 32
+
+#define TWOFISH_KEY_SIZE 32
+#define TWOFISH128_KEY_SIZE 16
+#define TWOFISH192_KEY_SIZE 24
+#define TWOFISH256_KEY_SIZE 32
+
+struct twofish_ctx
+{
+  uint32_t keys[40];
+  uint32_t s_box[4][256];
+};
+
+void
+twofish_set_key(struct twofish_ctx *ctx,
+		size_t length, const uint8_t *key);
+void
+twofish128_set_key(struct twofish_ctx *context, const uint8_t *key);
+void
+twofish192_set_key(struct twofish_ctx *context, const uint8_t *key);
+void
+twofish256_set_key(struct twofish_ctx *context, const uint8_t *key);
+
+void
+twofish_encrypt(const struct twofish_ctx *ctx,
+		size_t length, uint8_t *dst,
+		const uint8_t *src);
+void
+twofish_decrypt(const struct twofish_ctx *ctx,
+		size_t length, uint8_t *dst,
+		const uint8_t *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_TWOFISH_H_INCLUDED */