From e176e289ea9de5bea445e01abc46d54fff196add Mon Sep 17 00:00:00 2001
From: Simon Josefsson <simon@josefsson.org>
Date: Fri, 21 Oct 2005 12:28:51 +0000
Subject: Update.

---
 gl/des.h | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 gl/des.h

(limited to 'gl/des.h')

diff --git a/gl/des.h b/gl/des.h
new file mode 100644
index 0000000000..2b5f71237a
--- /dev/null
+++ b/gl/des.h
@@ -0,0 +1,114 @@
+/* des.h --- DES cipher implementation.
+ * Copyright (C) 2005 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1, or (at your
+ * option) any later version.
+ *
+ * This file 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 a copy of the GNU Lesser General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+/* Adapted for gnulib by Simon Josefsson, based on Libgcrypt. */
+
+#ifndef DES_H
+# define DES_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+/*
+ * Encryption/Decryption context of DES
+ */
+typedef struct
+{
+  uint32_t encrypt_subkeys[32];
+  uint32_t decrypt_subkeys[32];
+} des_ctx;
+
+/*
+ * Encryption/Decryption context of Triple-DES
+ */
+typedef struct
+{
+  uint32_t encrypt_subkeys[96];
+  uint32_t decrypt_subkeys[96];
+} tripledes_ctx;
+
+/* Check whether the 8 byte key is weak.  Does not check the parity
+ * bits of the key but simple ignore them. */
+extern bool
+des_is_weak_key (const char * key);
+
+/*
+ * DES
+ * ---
+ */
+
+/* Fill a DES context CTX with subkeys calculated from 64bit KEY.
+ * Does not check parity bits, but simply ignore them.  Does not check
+ * for weak keys. */
+extern void
+des_setkey (des_ctx *ctx, const char * key);
+
+/* Fill a DES context CTX with subkeys calculated from 64bit KEY, with
+ * weak key checking.  Does not check parity bits, but simply ignore
+ * them. */
+extern bool
+des_makekey (des_ctx *ctx, const char * key, size_t keylen);
+
+/* Electronic Codebook Mode DES encryption/decryption of data
+ * according to 'mode'. */
+extern void
+des_ecb_crypt (des_ctx *ctx, const char * from,  char * to, int mode);
+
+#define des_ecb_encrypt(ctx, from, to)	      des_ecb_crypt(ctx, from, to, 0)
+#define des_ecb_decrypt(ctx, from, to)	      des_ecb_crypt(ctx, from, to, 1)
+
+/* Triple-DES
+ * ----------
+ */
+
+/* Fill a Triple-DES context CTX with subkeys calculated from two
+ * 64bit keys in KEY1 and KEY2.  Does not check the parity bits of the
+ * keys, but simply ignore them.  Does not check for weak keys. */
+extern void
+tripledes_set2keys (tripledes_ctx *ctx, const char * key1, const char * key2);
+
+/*
+ * Fill a Triple-DES context CTX with subkeys calculated from three
+ * 64bit keys in KEY1, KEY2 and KEY3.  Does not check the parity bits
+ * of the keys, but simply ignore them.  Does not check for weak
+ * keys. */
+extern void
+tripledes_set3keys (tripledes_ctx *ctx, const char * key1,
+		    const char * key2, const char * key3);
+
+/* Fill a Triple-DES context CTX with subkeys calculated from three
+ * concatenated 64bit keys in KEY, with weak key checking.  Does not
+ * check the parity bits of the keys, but simply ignore them. */
+extern bool
+tripledes_makekey (tripledes_ctx *ctx, const char * key, size_t keylen);
+
+/* Electronic Codebook Mode Triple-DES encryption/decryption of data
+ * according to 'mode'.  Sometimes this mode is named 'EDE' mode
+ * (Encryption-Decryption-Encryption). */
+extern void
+tripledes_ecb_crypt (tripledes_ctx *ctx,
+		     const char * from,
+		     char * to, int mode);
+
+#define tripledes_ecb_encrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,0)
+#define tripledes_ecb_decrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,1)
+
+#endif /* DES_H */
-- 
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