2G ems initial

2024-03-13 09:30:40 +08:00
commit eed6460ad2
1234 changed files with 419571 additions and 0 deletions
--- a/include/nettle/serpent.h
+++ b/include/nettle/serpent.h
@@ -0,0 +1,102 @@
+/* serpent.h
+
+   The serpent block cipher.
+
+   Copyright (C) 2001 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/.
+*/
+
+/* Serpent is a 128-bit block cipher that accepts a key size of 256
+ * bits, designed by Ross Anderson, Eli Biham, and Lars Knudsen. See
+ * http://www.cl.cam.ac.uk/~rja14/serpent.html for details.
+ */
+
+#ifndef NETTLE_SERPENT_H_INCLUDED
+#define NETTLE_SERPENT_H_INCLUDED
+
+#include "nettle-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Name mangling */
+#define serpent_set_key nettle_serpent_set_key
+#define serpent128_set_key nettle_serpent128_set_key
+#define serpent192_set_key nettle_serpent192_set_key
+#define serpent256_set_key nettle_serpent256_set_key
+#define serpent_encrypt nettle_serpent_encrypt
+#define serpent_decrypt nettle_serpent_decrypt
+
+#define SERPENT_BLOCK_SIZE 16
+
+/* Other key lengths are possible, but the design of Serpent makes
+ * smaller key lengths quite pointless; they cheated with the AES
+ * requirements, using a 256-bit key length exclusively and just
+ * padding it out if the desired key length was less, so there really
+ * is no advantage to using key lengths less than 256 bits. */
+#define SERPENT_KEY_SIZE 32
+
+/* Allow keys of size 128 <= bits <= 256 */
+
+#define SERPENT_MIN_KEY_SIZE 16
+#define SERPENT_MAX_KEY_SIZE 32
+
+#define SERPENT128_KEY_SIZE 16
+#define SERPENT192_KEY_SIZE 24
+#define SERPENT256_KEY_SIZE 32
+
+struct serpent_ctx
+{
+  uint32_t keys[33][4];  /* key schedule */
+};
+
+void
+serpent_set_key(struct serpent_ctx *ctx,
+                size_t length, const uint8_t *key);
+void
+serpent128_set_key(struct serpent_ctx *ctx, const uint8_t *key);
+void
+serpent192_set_key(struct serpent_ctx *ctx, const uint8_t *key);
+void
+serpent256_set_key(struct serpent_ctx *ctx, const uint8_t *key);
+
+void
+serpent_encrypt(const struct serpent_ctx *ctx,
+                size_t length, uint8_t *dst,
+                const uint8_t *src);
+void
+serpent_decrypt(const struct serpent_ctx *ctx,
+                size_t length, uint8_t *dst,
+                const uint8_t *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_SERPENT_H_INCLUDED */