moving of A5/1

[avr-crypto-lib.git] / a51 / A5_1.h

diff --git a/a51/A5_1.h b/a51/A5_1.h
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+/* A5_1.h */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+/* 
+ * File:    A5_1.h
+ * Author:  Daniel Otte
+ * Date:    24.06.2006
+ * License: GPL
+ * Description: Implementation of the A5/1 stream cipher algorithm, as used in GSM.
+ * ! Warning, this is weak crypto !
+ * 
+ */
+#ifndef A5_1_H_
+#define A5_1_H_
+
+#include <stdint.h>
+
+#define R1_LENGTH 19
+#define R2_LENGTH 22
+#define R3_LENGTH 23
+#define R1_CLK 11
+#define R2_CLK 12
+#define R3_CLK 13
+
+/* 3-Bit word parity lookup table (Byte) 
+ * 0: 0
+ * 1: 1
+ * 2: 1
+ * 3: 0
+ * 4: 1
+ * 5: 0
+ * 6: 0
+ * 7: 1
+ * => 1001.0110 = 0x96
+ * 
+ */
+
+#define PARITY_LOOKUP 0x96
+
+typedef struct {
+       /* we are wasting one byte here but this allows a much faster implementation */
+       uint8_t r1[3], r2[3], r3[3]; /* the three regs, 19,22,23 bit in length  */
+} a5_1_ctx_t;
+ 
+
+void           a5_1_init(a5_1_ctx_t *c, void* key, uint8_t keylength_b, void* iv, uint8_t ivlength_b);
+uint8_t                a5_1_clock(a5_1_ctx_t *c);
+uint8_t        a5_1_gen(a5_1_ctx_t *c);
+
+#endif