lfsr

.gitignore

@@ -1,21 +1,6 @@
-# ---> Rust
-# Generated by Cargo
-# will have compiled files and executables
-debug/
-target/
-
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
-# These are backup files generated by rustfmt
-**/*.rs.bk
-
-# MSVC Windows builds of rustc generate these, which store debugging information
-*.pdb
-
 # ---> Kate
 # Swap Files #
 .*.kate-swp
 .swp.*
 
+*.pdf

main.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+class lfsr(object):
+    def __init__(self, state, taps):
+        self.state = state
+        self.taps = taps
+
+    # getters and setters (private attributes)
+    def get_state(self):
+        return self.__state
+    def set_state(self, value):
+        self.__state = value
+    state = property(fget=get_state, fset=set_state, doc="lfsr state (current bits value in lfsr)")
+
+    def get_taps(self):
+        return self.__taps
+    def set_taps(self, valeur):
+        self.__taps = valeur
+    taps = property(fget=get_taps, fset=set_taps, doc="lfsr taps (bit positions affecting next state)")
+
+    def shift(self):
+        '''
+        calculate next state and return the output bit
+        '''
+        feedback = sum(self.state[tap] for tap in self.taps) % 2
+        output = self.state[-1]
+        self.state = [feedback] + self.state[:-1]
+        return output
+
+
+key=[0]*16
+key.append(1)
+taps = [16-0, 16-14]
+
+lfsr17 = lfsr(key, taps)
+
+# Generate 100 bits
+for _ in range(100):
+    print(lfsr17.shift(), end=' ')