Now including a nice and compact 3DES implementation done by Christophe

Devine. OpenSSL exports nice cipher functions, but GnuTLS only just started
doing this in 2.10 or so (not even in Debian Sid yet).                    

So instead of adding a whole library for encrypting 72 bytes of data, let's
have a built-in 3DES implementation for a while..

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/des.h b/lib/des.h
new file mode 100644
index 00000000..92fbfd22
--- /dev/null
+++ b/lib/des.h
@@ -0,0 +1,51 @@
+/*
+ *  FIPS-46-3 compliant 3DES implementation
+ *
+ *  Copyright (C) 2001-2003  Christophe Devine
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of 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.
+ *
+ *  This program 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 General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _DES_H
+#define _DES_H
+
+#include <stdint.h>
+
+typedef struct
+{
+    uint32_t esk[32];     /* DES encryption subkeys */
+    uint32_t dsk[32];     /* DES decryption subkeys */
+}
+des_context;
+
+typedef struct
+{
+    uint32_t esk[96];     /* Triple-DES encryption subkeys */
+    uint32_t dsk[96];     /* Triple-DES decryption subkeys */
+}
+des3_context;
+
+int  des_set_key( des_context *ctx, uint8_t key[8] );
+void des_encrypt( des_context *ctx, uint8_t input[8], uint8_t output[8] );
+void des_decrypt( des_context *ctx, uint8_t input[8], uint8_t output[8] );
+
+int  des3_set_2keys( des3_context *ctx, const uint8_t key1[8], const uint8_t key2[8] );
+int  des3_set_3keys( des3_context *ctx, const uint8_t key1[8], const uint8_t key2[8],
+                                        const uint8_t key3[8] );
+
+void des3_encrypt( des3_context *ctx, uint8_t input[8], uint8_t output[8] );
+void des3_decrypt( des3_context *ctx, uint8_t input[8], uint8_t output[8] );
+
+#endif /* des.h */