X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=A5_1.h;fp=A5_1.h;h=8803198b644698283761b4c5e1105054670af0b1;hb=3c995d0a8faeb9d37927d48e20fc45d839e066ea;hp=0000000000000000000000000000000000000000;hpb=a7f70b30f9c841e9d2287f8428b6263642eb0493;p=avr-crypto-lib.git

diff --git a/A5_1.h b/A5_1.h
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+/* 
+ * 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 {
+	uint32_t r1,r2,r3; /* the three regs, 19,22,23 bit in length  */
+} a5_1_ctx_t;
+ 
+
+void		a5_1_init(a5_1_ctx_t *c, uint8_t *key, uint8_t length);
+bool		a5_1_clock(a5_1_ctx_t *c);
+uint8_t a5_1_gen(a5_	1_ctx_t *c);
+
+#endif