new, derived from old avr/crypto + cast5

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

diff --git a/A5_1.h b/A5_1.h
new file mode 100644 (file)
index 0000000..8803198
--- /dev/null
+++ b/A5_1.h
@@ -0,0 +1,46 @@
+/* 
+ * 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