add support for concurrent threads in python3 version

Signed-off-by: Mattias Andrée <maandree@operamail.com>

2 files changed, 352 insertions, 356 deletions

diff --git a/python3/sha3.py b/python3/sha3.py
index 340cf5f..a3483b2 100644
--- a/python3/sha3.py
+++ b/python3/sha3.py
@@ -27,53 +27,53 @@ class SHA3:
     '''
     
     
-    RC = [0x0000000000000001, 0x0000000000008082, 0x800000000000808A, 0x8000000080008000,
-          0x000000000000808B, 0x0000000080000001, 0x8000000080008081, 0x8000000000008009,
-          0x000000000000008A, 0x0000000000000088, 0x0000000080008009, 0x000000008000000A,
-          0x000000008000808B, 0x800000000000008B, 0x8000000000008089, 0x8000000000008003,
-          0x8000000000008002, 0x8000000000000080, 0x000000000000800A, 0x800000008000000A,
-          0x8000000080008081, 0x8000000000008080, 0x0000000080000001, 0x8000000080008008]
-    '''
-    :list<int>  Round contants
-    '''
-    
-    B = [0] * 25
-    '''
-    :list<int>  Keccak-f round temporary
-    '''
-    
-    C = [0] * 5
-    '''
-    :list<int>  Keccak-f round temporary
-    '''
-    
-
-    (r, c, n, b, w, wmod, l, nr) = (0, 0, 0, 0, 0, 0, 0, 0)
-    '''
-       r:int  The bitrate
-       c:int  The capacity
-       n:int  The output size
-       b:int  The state size
-       w:int  The word size
-    wmod:int  The word mask
-       l:int  ℓ, the binary logarithm of the word size
-      nr:int  12 + 2ℓ, the number of rounds
-    '''
-    
-    S = None
-    '''
-    :list<int>  The current state
-    '''
-    
-    M = None
-    '''
-    :bytes  Left over water to fill the sponge with at next update
-    '''
+    def __init__(self):
+        self.RC = [0x0000000000000001, 0x0000000000008082, 0x800000000000808A, 0x8000000080008000,
+                   0x000000000000808B, 0x0000000080000001, 0x8000000080008081, 0x8000000000008009,
+                   0x000000000000008A, 0x0000000000000088, 0x0000000080008009, 0x000000008000000A,
+                   0x000000008000808B, 0x800000000000008B, 0x8000000000008089, 0x8000000000008003,
+                   0x8000000000008002, 0x8000000000000080, 0x000000000000800A, 0x800000008000000A,
+                   0x8000000080008081, 0x8000000000008080, 0x0000000080000001, 0x8000000080008008]
+        '''
+        :list<int>  Round contants
+        '''
+        
+        self.B = [0] * 25
+        '''
+        :list<int>  Keccak-f round temporary
+        '''
+        
+        self.C = [0] * 5
+        '''
+        :list<int>  Keccak-f round temporary
+        '''
+        
+        
+        (self.r, self.c, self.n, self.b, self.w, self.wmod, self.l, self.nr) = (0, 0, 0, 0, 0, 0, 0, 0)
+        '''
+           r:int  The bitrate
+           c:int  The capacity
+           n:int  The output size
+           b:int  The state size
+           w:int  The word size
+        wmod:int  The word mask
+           l:int  ℓ, the binary logarithm of the word size
+          nr:int  12 + 2ℓ, the number of rounds
+        '''
+        
+        self.S = None
+        '''
+        :list<int>  The current state
+        '''
+        
+        self.M = None
+        '''
+        :bytes  Left over water to fill the sponge with at next update
+        '''
     
     
     
-    @staticmethod
-    def rotate(x, n):
+    def rotate(self, x, n):
         '''
         Rotate a word
         
@@ -81,12 +81,12 @@ class SHA3:
         @param   n:int  Rotation steps
         @return   :int  The value rotated
         '''
-        m = n % SHA3.w
-        return ((x >> (SHA3.w - m)) + (x << m)) & SHA3.wmod
+        m = n % self.w
+        return ((x >> (self.w - m)) + (x << m)) & self.wmod
     
     
     @staticmethod
-    def rotate64(x, n):
+    def rotate64(self, x, n):
         '''
         Rotate a 64-bit word
         
@@ -113,171 +113,169 @@ class SHA3:
         return rc
     
     
-    @staticmethod
-    def keccakFRound(A, rc):
+    def keccakFRound(self, A, rc):
         '''
         Perform one round of computation
         
         @param   A:list<int>  The current state
         @param  rc:int        Round constant
         '''
-        if SHA3.w == 64:
+        if self.w == 64:
             # θ step (step 1 and 2 of 3)
-            SHA3.C[0] = (A[0]  ^ A[1])  ^ (A[2]  ^ A[3])  ^ A[4]
-            SHA3.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14]
-            db = SHA3.C[0] ^ SHA3.rotate64(SHA3.C[2], 1)
-            SHA3.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24]
-            dd = SHA3.C[2] ^ SHA3.rotate64(SHA3.C[4], 1)
-            SHA3.C[1] = (A[5]  ^ A[6])  ^ (A[7]  ^ A[8])  ^ A[9]
-            da = SHA3.C[4] ^ SHA3.rotate64(SHA3.C[1], 1)
-            SHA3.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19]
-            dc = SHA3.C[1] ^ SHA3.rotate64(SHA3.C[3], 1)
-            de = SHA3.C[3] ^ SHA3.rotate64(SHA3.C[0], 1)
+            self.C[0] = (A[0]  ^ A[1])  ^ (A[2]  ^ A[3])  ^ A[4]
+            self.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14]
+            db = self.C[0] ^ SHA3.rotate64(self.C[2], 1)
+            self.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24]
+            dd = self.C[2] ^ SHA3.rotate64(self.C[4], 1)
+            self.C[1] = (A[5]  ^ A[6])  ^ (A[7]  ^ A[8])  ^ A[9]
+            da = self.C[4] ^ SHA3.rotate64(self.C[1], 1)
+            self.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19]
+            dc = self.C[1] ^ SHA3.rotate64(self.C[3], 1)
+            de = self.C[3] ^ SHA3.rotate64(self.C[0], 1)
             
             # ρ and π steps, with last part of θ
-            SHA3.B[0] = SHA3.rotate64(A[0] ^ da, 0)
-            SHA3.B[1] = SHA3.rotate64(A[15] ^ dd, 28)
-            SHA3.B[2] = SHA3.rotate64(A[5] ^ db, 1)
-            SHA3.B[3] = SHA3.rotate64(A[20] ^ de, 27)
-            SHA3.B[4] = SHA3.rotate64(A[10] ^ dc, 62)
+            self.B[0] = SHA3.rotate64(A[0] ^ da, 0)
+            self.B[1] = SHA3.rotate64(A[15] ^ dd, 28)
+            self.B[2] = SHA3.rotate64(A[5] ^ db, 1)
+            self.B[3] = SHA3.rotate64(A[20] ^ de, 27)
+            self.B[4] = SHA3.rotate64(A[10] ^ dc, 62)
             
-            SHA3.B[5] = SHA3.rotate64(A[6] ^ db, 44)
-            SHA3.B[6] = SHA3.rotate64(A[21] ^ de, 20)
-            SHA3.B[7] = SHA3.rotate64(A[11] ^ dc, 6)
-            SHA3.B[8] = SHA3.rotate64(A[1] ^ da, 36)
-            SHA3.B[9] = SHA3.rotate64(A[16] ^ dd, 55)
+            self.B[5] = SHA3.rotate64(A[6] ^ db, 44)
+            self.B[6] = SHA3.rotate64(A[21] ^ de, 20)
+            self.B[7] = SHA3.rotate64(A[11] ^ dc, 6)
+            self.B[8] = SHA3.rotate64(A[1] ^ da, 36)
+            self.B[9] = SHA3.rotate64(A[16] ^ dd, 55)
             
-            SHA3.B[10] = SHA3.rotate64(A[12] ^ dc, 43)
-            SHA3.B[11] = SHA3.rotate64(A[2] ^ da, 3)
-            SHA3.B[12] = SHA3.rotate64(A[17] ^ dd, 25)
-            SHA3.B[13] = SHA3.rotate64(A[7] ^ db, 10)
-            SHA3.B[14] = SHA3.rotate64(A[22] ^ de, 39)
+            self.B[10] = SHA3.rotate64(A[12] ^ dc, 43)
+            self.B[11] = SHA3.rotate64(A[2] ^ da, 3)
+            self.B[12] = SHA3.rotate64(A[17] ^ dd, 25)
+            self.B[13] = SHA3.rotate64(A[7] ^ db, 10)
+            self.B[14] = SHA3.rotate64(A[22] ^ de, 39)
             
-            SHA3.B[15] = SHA3.rotate64(A[18] ^ dd, 21)
-            SHA3.B[16] = SHA3.rotate64(A[8] ^ db, 45)
-            SHA3.B[17] = SHA3.rotate64(A[23] ^ de, 8)
-            SHA3.B[18] = SHA3.rotate64(A[13] ^ dc, 15)
-            SHA3.B[19] = SHA3.rotate64(A[3] ^ da, 41)
+            self.B[15] = SHA3.rotate64(A[18] ^ dd, 21)
+            self.B[16] = SHA3.rotate64(A[8] ^ db, 45)
+            self.B[17] = SHA3.rotate64(A[23] ^ de, 8)
+            self.B[18] = SHA3.rotate64(A[13] ^ dc, 15)
+            self.B[19] = SHA3.rotate64(A[3] ^ da, 41)
             
-            SHA3.B[20] = SHA3.rotate64(A[24] ^ de, 14)
-            SHA3.B[21] = SHA3.rotate64(A[14] ^ dc, 61)
-            SHA3.B[22] = SHA3.rotate64(A[4] ^ da, 18)
-            SHA3.B[23] = SHA3.rotate64(A[19] ^ dd, 56)
-            SHA3.B[24] = SHA3.rotate64(A[9] ^ db, 2)
+            self.B[20] = SHA3.rotate64(A[24] ^ de, 14)
+            self.B[21] = SHA3.rotate64(A[14] ^ dc, 61)
+            self.B[22] = SHA3.rotate64(A[4] ^ da, 18)
+            self.B[23] = SHA3.rotate64(A[19] ^ dd, 56)
+            self.B[24] = SHA3.rotate64(A[9] ^ db, 2)
         else:
             # θ step (step 1 and 2 of 3)
-            SHA3.C[0] = (A[0]  ^ A[1])  ^ (A[2]  ^ A[3])  ^ A[4]
-            SHA3.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14]
-            db = SHA3.C[0] ^ SHA3.rotate(SHA3.C[2], 1)
-            SHA3.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24]
-            dd = SHA3.C[2] ^ SHA3.rotate(SHA3.C[4], 1)
-            SHA3.C[1] = (A[5]  ^ A[6])  ^ (A[7]  ^ A[8])  ^ A[9]
-            da = SHA3.C[4] ^ SHA3.rotate(SHA3.C[1], 1)
-            SHA3.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19]
-            dc = SHA3.C[1] ^ SHA3.rotate(SHA3.C[3], 1)
-            de = SHA3.C[3] ^ SHA3.rotate(SHA3.C[0], 1)
+            self.C[0] = (A[0]  ^ A[1])  ^ (A[2]  ^ A[3])  ^ A[4]
+            self.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14]
+            db = self.C[0] ^ self.rotate(self.C[2], 1)
+            self.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24]
+            dd = self.C[2] ^ self.rotate(self.C[4], 1)
+            self.C[1] = (A[5]  ^ A[6])  ^ (A[7]  ^ A[8])  ^ A[9]
+            da = self.C[4] ^ self.rotate(self.C[1], 1)
+            self.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19]
+            dc = self.C[1] ^ self.rotate(self.C[3], 1)
+            de = self.C[3] ^ self.rotate(self.C[0], 1)
             
             # ρ and π steps, with last part of θ
-            SHA3.B[0] = SHA3.rotate(A[0] ^ da, 0)
-            SHA3.B[1] = SHA3.rotate(A[15] ^ dd, 28)
-            SHA3.B[2] = SHA3.rotate(A[5] ^ db, 1)
-            SHA3.B[3] = SHA3.rotate(A[20] ^ de, 27)
-            SHA3.B[4] = SHA3.rotate(A[10] ^ dc, 62)
+            self.B[0] = self.rotate(A[0] ^ da, 0)
+            self.B[1] = self.rotate(A[15] ^ dd, 28)
+            self.B[2] = self.rotate(A[5] ^ db, 1)
+            self.B[3] = self.rotate(A[20] ^ de, 27)
+            self.B[4] = self.rotate(A[10] ^ dc, 62)
             
-            SHA3.B[5] = SHA3.rotate(A[6] ^ db, 44)
-            SHA3.B[6] = SHA3.rotate(A[21] ^ de, 20)
-            SHA3.B[7] = SHA3.rotate(A[11] ^ dc, 6)
-            SHA3.B[8] = SHA3.rotate(A[1] ^ da, 36)
-            SHA3.B[9] = SHA3.rotate(A[16] ^ dd, 55)
+            self.B[5] = self.rotate(A[6] ^ db, 44)
+            self.B[6] = self.rotate(A[21] ^ de, 20)
+            self.B[7] = self.rotate(A[11] ^ dc, 6)
+            self.B[8] = self.rotate(A[1] ^ da, 36)
+            self.B[9] = self.rotate(A[16] ^ dd, 55)
             
-            SHA3.B[10] = SHA3.rotate(A[12] ^ dc, 43)
-            SHA3.B[11] = SHA3.rotate(A[2] ^ da, 3)
-            SHA3.B[12] = SHA3.rotate(A[17] ^ dd, 25)
-            SHA3.B[13] = SHA3.rotate(A[7] ^ db, 10)
-            SHA3.B[14] = SHA3.rotate(A[22] ^ de, 39)
+            self.B[10] = self.rotate(A[12] ^ dc, 43)
+            self.B[11] = self.rotate(A[2] ^ da, 3)
+            self.B[12] = self.rotate(A[17] ^ dd, 25)
+            self.B[13] = self.rotate(A[7] ^ db, 10)
+            self.B[14] = self.rotate(A[22] ^ de, 39)
             
-            SHA3.B[15] = SHA3.rotate(A[18] ^ dd, 21)
-            SHA3.B[16] = SHA3.rotate(A[8] ^ db, 45)
-            SHA3.B[17] = SHA3.rotate(A[23] ^ de, 8)
-            SHA3.B[18] = SHA3.rotate(A[13] ^ dc, 15)
-            SHA3.B[19] = SHA3.rotate(A[3] ^ da, 41)
+            self.B[15] = self.rotate(A[18] ^ dd, 21)
+            self.B[16] = self.rotate(A[8] ^ db, 45)
+            self.B[17] = self.rotate(A[23] ^ de, 8)
+            self.B[18] = self.rotate(A[13] ^ dc, 15)
+            self.B[19] = self.rotate(A[3] ^ da, 41)
             
-            SHA3.B[20] = SHA3.rotate(A[24] ^ de, 14)
-            SHA3.B[21] = SHA3.rotate(A[14] ^ dc, 61)
-            SHA3.B[22] = SHA3.rotate(A[4] ^ da, 18)
-            SHA3.B[23] = SHA3.rotate(A[19] ^ dd, 56)
-            SHA3.B[24] = SHA3.rotate(A[9] ^ db, 2)
+            self.B[20] = self.rotate(A[24] ^ de, 14)
+            self.B[21] = self.rotate(A[14] ^ dc, 61)
+            self.B[22] = self.rotate(A[4] ^ da, 18)
+            self.B[23] = self.rotate(A[19] ^ dd, 56)
+            self.B[24] = self.rotate(A[9] ^ db, 2)
         
         # ξ step
-        A[0] = SHA3.B[0] ^ ((~(SHA3.B[5])) & SHA3.B[10])
-        A[1] = SHA3.B[1] ^ ((~(SHA3.B[6])) & SHA3.B[11])
-        A[2] = SHA3.B[2] ^ ((~(SHA3.B[7])) & SHA3.B[12])
-        A[3] = SHA3.B[3] ^ ((~(SHA3.B[8])) & SHA3.B[13])
-        A[4] = SHA3.B[4] ^ ((~(SHA3.B[9])) & SHA3.B[14])
-        
-        A[5] = SHA3.B[5] ^ ((~(SHA3.B[10])) & SHA3.B[15])
-        A[6] = SHA3.B[6] ^ ((~(SHA3.B[11])) & SHA3.B[16])
-        A[7] = SHA3.B[7] ^ ((~(SHA3.B[12])) & SHA3.B[17])
-        A[8] = SHA3.B[8] ^ ((~(SHA3.B[13])) & SHA3.B[18])
-        A[9] = SHA3.B[9] ^ ((~(SHA3.B[14])) & SHA3.B[19])
-        
-        A[10] = SHA3.B[10] ^ ((~(SHA3.B[15])) & SHA3.B[20])
-        A[11] = SHA3.B[11] ^ ((~(SHA3.B[16])) & SHA3.B[21])
-        A[12] = SHA3.B[12] ^ ((~(SHA3.B[17])) & SHA3.B[22])
-        A[13] = SHA3.B[13] ^ ((~(SHA3.B[18])) & SHA3.B[23])
-        A[14] = SHA3.B[14] ^ ((~(SHA3.B[19])) & SHA3.B[24])
-        
-        A[15] = SHA3.B[15] ^ ((~(SHA3.B[20])) & SHA3.B[0])
-        A[16] = SHA3.B[16] ^ ((~(SHA3.B[21])) & SHA3.B[1])
-        A[17] = SHA3.B[17] ^ ((~(SHA3.B[22])) & SHA3.B[2])
-        A[18] = SHA3.B[18] ^ ((~(SHA3.B[23])) & SHA3.B[3])
-        A[19] = SHA3.B[19] ^ ((~(SHA3.B[24])) & SHA3.B[4])
-        
-        A[20] = SHA3.B[20] ^ ((~(SHA3.B[0])) & SHA3.B[5])
-        A[21] = SHA3.B[21] ^ ((~(SHA3.B[1])) & SHA3.B[6])
-        A[22] = SHA3.B[22] ^ ((~(SHA3.B[2])) & SHA3.B[7])
-        A[23] = SHA3.B[23] ^ ((~(SHA3.B[3])) & SHA3.B[8])
-        A[24] = SHA3.B[24] ^ ((~(SHA3.B[4])) & SHA3.B[9])
+        A[0] = self.B[0] ^ ((~(self.B[5])) & self.B[10])
+        A[1] = self.B[1] ^ ((~(self.B[6])) & self.B[11])
+        A[2] = self.B[2] ^ ((~(self.B[7])) & self.B[12])
+        A[3] = self.B[3] ^ ((~(self.B[8])) & self.B[13])
+        A[4] = self.B[4] ^ ((~(self.B[9])) & self.B[14])
+        
+        A[5] = self.B[5] ^ ((~(self.B[10])) & self.B[15])
+        A[6] = self.B[6] ^ ((~(self.B[11])) & self.B[16])
+        A[7] = self.B[7] ^ ((~(self.B[12])) & self.B[17])
+        A[8] = self.B[8] ^ ((~(self.B[13])) & self.B[18])
+        A[9] = self.B[9] ^ ((~(self.B[14])) & self.B[19])
+        
+        A[10] = self.B[10] ^ ((~(self.B[15])) & self.B[20])
+        A[11] = self.B[11] ^ ((~(self.B[16])) & self.B[21])
+        A[12] = self.B[12] ^ ((~(self.B[17])) & self.B[22])
+        A[13] = self.B[13] ^ ((~(self.B[18])) & self.B[23])
+        A[14] = self.B[14] ^ ((~(self.B[19])) & self.B[24])
+        
+        A[15] = self.B[15] ^ ((~(self.B[20])) & self.B[0])
+        A[16] = self.B[16] ^ ((~(self.B[21])) & self.B[1])
+        A[17] = self.B[17] ^ ((~(self.B[22])) & self.B[2])
+        A[18] = self.B[18] ^ ((~(self.B[23])) & self.B[3])
+        A[19] = self.B[19] ^ ((~(self.B[24])) & self.B[4])
+        
+        A[20] = self.B[20] ^ ((~(self.B[0])) & self.B[5])
+        A[21] = self.B[21] ^ ((~(self.B[1])) & self.B[6])
+        A[22] = self.B[22] ^ ((~(self.B[2])) & self.B[7])
+        A[23] = self.B[23] ^ ((~(self.B[3])) & self.B[8])
+        A[24] = self.B[24] ^ ((~(self.B[4])) & self.B[9])
         
         # ι step
         A[0] ^= rc
     
     
-    @staticmethod
-    def keccakF(A):
+    def keccakF(self, A):
         '''
         Perform Keccak-f function
         
         @param  A:list<int>  The current state
         '''
-        if (SHA3.nr == 24):
-            SHA3.keccakFRound(A, 0x0000000000000001)
-            SHA3.keccakFRound(A, 0x0000000000008082)
-            SHA3.keccakFRound(A, 0x800000000000808A)
-            SHA3.keccakFRound(A, 0x8000000080008000)
-            SHA3.keccakFRound(A, 0x000000000000808B)
-            SHA3.keccakFRound(A, 0x0000000080000001)
-            SHA3.keccakFRound(A, 0x8000000080008081)
-            SHA3.keccakFRound(A, 0x8000000000008009)
-            SHA3.keccakFRound(A, 0x000000000000008A)
-            SHA3.keccakFRound(A, 0x0000000000000088)
-            SHA3.keccakFRound(A, 0x0000000080008009)
-            SHA3.keccakFRound(A, 0x000000008000000A)
-            SHA3.keccakFRound(A, 0x000000008000808B)
-            SHA3.keccakFRound(A, 0x800000000000008B)
-            SHA3.keccakFRound(A, 0x8000000000008089)
-            SHA3.keccakFRound(A, 0x8000000000008003)
-            SHA3.keccakFRound(A, 0x8000000000008002)
-            SHA3.keccakFRound(A, 0x8000000000000080)
-            SHA3.keccakFRound(A, 0x000000000000800A)
-            SHA3.keccakFRound(A, 0x800000008000000A)
-            SHA3.keccakFRound(A, 0x8000000080008081)
-            SHA3.keccakFRound(A, 0x8000000000008080)
-            SHA3.keccakFRound(A, 0x0000000080000001)
-            SHA3.keccakFRound(A, 0x8000000080008008)
+        if (self.nr == 24):
+            self.keccakFRound(A, 0x0000000000000001)
+            self.keccakFRound(A, 0x0000000000008082)
+            self.keccakFRound(A, 0x800000000000808A)
+            self.keccakFRound(A, 0x8000000080008000)
+            self.keccakFRound(A, 0x000000000000808B)
+            self.keccakFRound(A, 0x0000000080000001)
+            self.keccakFRound(A, 0x8000000080008081)
+            self.keccakFRound(A, 0x8000000000008009)
+            self.keccakFRound(A, 0x000000000000008A)
+            self.keccakFRound(A, 0x0000000000000088)
+            self.keccakFRound(A, 0x0000000080008009)
+            self.keccakFRound(A, 0x000000008000000A)
+            self.keccakFRound(A, 0x000000008000808B)
+            self.keccakFRound(A, 0x800000000000008B)
+            self.keccakFRound(A, 0x8000000000008089)
+            self.keccakFRound(A, 0x8000000000008003)
+            self.keccakFRound(A, 0x8000000000008002)
+            self.keccakFRound(A, 0x8000000000000080)
+            self.keccakFRound(A, 0x000000000000800A)
+            self.keccakFRound(A, 0x800000008000000A)
+            self.keccakFRound(A, 0x8000000080008081)
+            self.keccakFRound(A, 0x8000000000008080)
+            self.keccakFRound(A, 0x0000000080000001)
+            self.keccakFRound(A, 0x8000000080008008)
         else:
-            for i in range(SHA3.nr):
-                SHA3.keccakFRound(A, SHA3.RC[i] & SHA3.wmod)
+            for i in range(self.nr):
+                self.keccakFRound(A, self.RC[i] & self.wmod)
     
     
     @staticmethod
@@ -346,8 +344,7 @@ class SHA3:
         return msg[:nrf] + bytes(message)
     
     
-    @staticmethod
-    def initialise(r, c, n):
+    def initialise(self, r, c, n):
         '''
         Initialise Keccak sponge
         
@@ -355,20 +352,19 @@ class SHA3:
         @param  c:int  The capacity
         @param  n:int  The output size
         '''
-        SHA3.r = r
-        SHA3.c = c
-        SHA3.n = n
-        SHA3.b = r + c
-        SHA3.w = SHA3.b // 25
-        SHA3.l = SHA3.lb(SHA3.w)
-        SHA3.nr = 12 + (SHA3.l << 1)
-        SHA3.wmod = (1 << SHA3.w) - 1
-        SHA3.S = [0] * 25
-        SHA3.M = bytes([])
-    
-    
-    @staticmethod
-    def update(msg, msglen = None):
+        self.r = r
+        self.c = c
+        self.n = n
+        self.b = r + c
+        self.w = self.b // 25
+        self.l = self.lb(self.w)
+        self.nr = 12 + (self.l << 1)
+        self.wmod = (1 << self.w) - 1
+        self.S = [0] * 25
+        self.M = bytes([])
+    
+    
+    def update(self, msg, msglen = None):
         '''
         Absorb the more of the message message to the Keccak sponge
         
@@ -378,78 +374,77 @@ class SHA3:
         if msglen is not None:
             msg = msg[:msglen]
         
-        rr = SHA3.r >> 3
-        ww = SHA3.w >> 3
+        rr = self.r >> 3
+        ww = self.w >> 3
         
-        SHA3.M += msg
-        nnn = len(SHA3.M)
-        nnn -= nnn % ((SHA3.r * SHA3.b) >> 3)
-        message = SHA3.M[:nnn]
-        SHA3.M = SHA3.M[nnn:]
+        self.M += msg
+        nnn = len(self.M)
+        nnn -= nnn % ((self.r * self.b) >> 3)
+        message = self.M[:nnn]
+        self.M = self.M[nnn:]
         
         # Absorbing phase
         if ww == 8:
             for i in range(0, nnn, rr):
-                SHA3.S[ 0] ^= SHA3.toLane64(message, rr, 0)
-                SHA3.S[ 5] ^= SHA3.toLane64(message, rr, 8)
-                SHA3.S[10] ^= SHA3.toLane64(message, rr, 16)
-                SHA3.S[15] ^= SHA3.toLane64(message, rr, 24)
-                SHA3.S[20] ^= SHA3.toLane64(message, rr, 32)
-                SHA3.S[ 1] ^= SHA3.toLane64(message, rr, 40)
-                SHA3.S[ 6] ^= SHA3.toLane64(message, rr, 48)
-                SHA3.S[11] ^= SHA3.toLane64(message, rr, 56)
-                SHA3.S[16] ^= SHA3.toLane64(message, rr, 64)
-                SHA3.S[21] ^= SHA3.toLane64(message, rr, 72)
-                SHA3.S[ 2] ^= SHA3.toLane64(message, rr, 80)
-                SHA3.S[ 7] ^= SHA3.toLane64(message, rr, 88)
-                SHA3.S[12] ^= SHA3.toLane64(message, rr, 96)
-                SHA3.S[17] ^= SHA3.toLane64(message, rr, 104)
-                SHA3.S[22] ^= SHA3.toLane64(message, rr, 112)
-                SHA3.S[ 3] ^= SHA3.toLane64(message, rr, 120)
-                SHA3.S[ 8] ^= SHA3.toLane64(message, rr, 128)
-                SHA3.S[13] ^= SHA3.toLane64(message, rr, 136)
-                SHA3.S[18] ^= SHA3.toLane64(message, rr, 144)
-                SHA3.S[23] ^= SHA3.toLane64(message, rr, 152)
-                SHA3.S[ 4] ^= SHA3.toLane64(message, rr, 160)
-                SHA3.S[ 9] ^= SHA3.toLane64(message, rr, 168)
-                SHA3.S[14] ^= SHA3.toLane64(message, rr, 176)
-                SHA3.S[19] ^= SHA3.toLane64(message, rr, 184)
-                SHA3.S[24] ^= SHA3.toLane64(message, rr, 192)
-                SHA3.keccakF(SHA3.S)
+                self.S[ 0] ^= SHA3.toLane64(message, rr, 0)
+                self.S[ 5] ^= SHA3.toLane64(message, rr, 8)
+                self.S[10] ^= SHA3.toLane64(message, rr, 16)
+                self.S[15] ^= SHA3.toLane64(message, rr, 24)
+                self.S[20] ^= SHA3.toLane64(message, rr, 32)
+                self.S[ 1] ^= SHA3.toLane64(message, rr, 40)
+                self.S[ 6] ^= SHA3.toLane64(message, rr, 48)
+                self.S[11] ^= SHA3.toLane64(message, rr, 56)
+                self.S[16] ^= SHA3.toLane64(message, rr, 64)
+                self.S[21] ^= SHA3.toLane64(message, rr, 72)
+                self.S[ 2] ^= SHA3.toLane64(message, rr, 80)
+                self.S[ 7] ^= SHA3.toLane64(message, rr, 88)
+                self.S[12] ^= SHA3.toLane64(message, rr, 96)
+                self.S[17] ^= SHA3.toLane64(message, rr, 104)
+                self.S[22] ^= SHA3.toLane64(message, rr, 112)
+                self.S[ 3] ^= SHA3.toLane64(message, rr, 120)
+                self.S[ 8] ^= SHA3.toLane64(message, rr, 128)
+                self.S[13] ^= SHA3.toLane64(message, rr, 136)
+                self.S[18] ^= SHA3.toLane64(message, rr, 144)
+                self.S[23] ^= SHA3.toLane64(message, rr, 152)
+                self.S[ 4] ^= SHA3.toLane64(message, rr, 160)
+                self.S[ 9] ^= SHA3.toLane64(message, rr, 168)
+                self.S[14] ^= SHA3.toLane64(message, rr, 176)
+                self.S[19] ^= SHA3.toLane64(message, rr, 184)
+                self.S[24] ^= SHA3.toLane64(message, rr, 192)
+                self.keccakF(self.S)
                 message = message[rr:]
         else:
             for i in range(0, nnn, rr):
-                SHA3.S[ 0] ^= SHA3.toLane(message, rr, ww,  0)
-                SHA3.S[ 5] ^= SHA3.toLane(message, rr, ww,      ww)
-                SHA3.S[10] ^= SHA3.toLane(message, rr, ww,  2 * ww)
-                SHA3.S[15] ^= SHA3.toLane(message, rr, ww,  3 * ww)
-                SHA3.S[20] ^= SHA3.toLane(message, rr, ww,  4 * ww)
-                SHA3.S[ 1] ^= SHA3.toLane(message, rr, ww,  5 * ww)
-                SHA3.S[ 6] ^= SHA3.toLane(message, rr, ww,  6 * ww)
-                SHA3.S[11] ^= SHA3.toLane(message, rr, ww,  7 * ww)
-                SHA3.S[16] ^= SHA3.toLane(message, rr, ww,  8 * ww)
-                SHA3.S[21] ^= SHA3.toLane(message, rr, ww,  9 * ww)
-                SHA3.S[ 2] ^= SHA3.toLane(message, rr, ww, 10 * ww)
-                SHA3.S[ 7] ^= SHA3.toLane(message, rr, ww, 11 * ww)
-                SHA3.S[12] ^= SHA3.toLane(message, rr, ww, 12 * ww)
-                SHA3.S[17] ^= SHA3.toLane(message, rr, ww, 13 * ww)
-                SHA3.S[22] ^= SHA3.toLane(message, rr, ww, 14 * ww)
-                SHA3.S[ 3] ^= SHA3.toLane(message, rr, ww, 15 * ww)
-                SHA3.S[ 8] ^= SHA3.toLane(message, rr, ww, 16 * ww)
-                SHA3.S[13] ^= SHA3.toLane(message, rr, ww, 17 * ww)
-                SHA3.S[18] ^= SHA3.toLane(message, rr, ww, 18 * ww)
-                SHA3.S[23] ^= SHA3.toLane(message, rr, ww, 19 * ww)
-                SHA3.S[ 4] ^= SHA3.toLane(message, rr, ww, 20 * ww)
-                SHA3.S[ 9] ^= SHA3.toLane(message, rr, ww, 21 * ww)
-                SHA3.S[14] ^= SHA3.toLane(message, rr, ww, 22 * ww)
-                SHA3.S[19] ^= SHA3.toLane(message, rr, ww, 23 * ww)
-                SHA3.S[24] ^= SHA3.toLane(message, rr, ww, 24 * ww)
+                self.S[ 0] ^= SHA3.toLane(message, rr, ww,  0)
+                self.S[ 5] ^= SHA3.toLane(message, rr, ww,      ww)
+                self.S[10] ^= SHA3.toLane(message, rr, ww,  2 * ww)
+                self.S[15] ^= SHA3.toLane(message, rr, ww,  3 * ww)
+                self.S[20] ^= SHA3.toLane(message, rr, ww,  4 * ww)
+                self.S[ 1] ^= SHA3.toLane(message, rr, ww,  5 * ww)
+                self.S[ 6] ^= SHA3.toLane(message, rr, ww,  6 * ww)
+                self.S[11] ^= SHA3.toLane(message, rr, ww,  7 * ww)
+                self.S[16] ^= SHA3.toLane(message, rr, ww,  8 * ww)
+                self.S[21] ^= SHA3.toLane(message, rr, ww,  9 * ww)
+                self.S[ 2] ^= SHA3.toLane(message, rr, ww, 10 * ww)
+                self.S[ 7] ^= SHA3.toLane(message, rr, ww, 11 * ww)
+                self.S[12] ^= SHA3.toLane(message, rr, ww, 12 * ww)
+                self.S[17] ^= SHA3.toLane(message, rr, ww, 13 * ww)
+                self.S[22] ^= SHA3.toLane(message, rr, ww, 14 * ww)
+                self.S[ 3] ^= SHA3.toLane(message, rr, ww, 15 * ww)
+                self.S[ 8] ^= SHA3.toLane(message, rr, ww, 16 * ww)
+                self.S[13] ^= SHA3.toLane(message, rr, ww, 17 * ww)
+                self.S[18] ^= SHA3.toLane(message, rr, ww, 18 * ww)
+                self.S[23] ^= SHA3.toLane(message, rr, ww, 19 * ww)
+                self.S[ 4] ^= SHA3.toLane(message, rr, ww, 20 * ww)
+                self.S[ 9] ^= SHA3.toLane(message, rr, ww, 21 * ww)
+                self.S[14] ^= SHA3.toLane(message, rr, ww, 22 * ww)
+                self.S[19] ^= SHA3.toLane(message, rr, ww, 23 * ww)
+                self.S[24] ^= SHA3.toLane(message, rr, ww, 24 * ww)
                 message = message[rr:]
-                SHA3.keccakF(SHA3.S)
+                self.keccakF(self.S)
     
     
-    @staticmethod
-    def digest(msg = None, msglen = None, withReturn = None):
+    def digest(self, msg = None, msglen = None, withReturn = None):
         '''
         Absorb the last part of the message and squeeze the Keccak sponge
         
@@ -466,86 +461,86 @@ class SHA3:
             msg = bytes([])
         elif msglen is not None:
             msg = msg[:msglen]
-        message = SHA3.pad10star1(SHA3.M + msg, SHA3.r)
-        SHA3.M = None
+        message = self.pad10star1(self.M + msg, self.r)
+        self.M = None
         nnn = len(message)
         
-        rr = SHA3.r >> 3
-        nn = (SHA3.n + 7) >> 3
-        ww = SHA3.w >> 3
+        rr = self.r >> 3
+        nn = (self.n + 7) >> 3
+        ww = self.w >> 3
         
         # Absorbing phase
         if ww == 8:
             for i in range(0, nnn, rr):
-                SHA3.S[ 0] ^= SHA3.toLane64(message, rr, 0)
-                SHA3.S[ 5] ^= SHA3.toLane64(message, rr, 8)
-                SHA3.S[10] ^= SHA3.toLane64(message, rr, 16)
-                SHA3.S[15] ^= SHA3.toLane64(message, rr, 24)
-                SHA3.S[20] ^= SHA3.toLane64(message, rr, 32)
-                SHA3.S[ 1] ^= SHA3.toLane64(message, rr, 40)
-                SHA3.S[ 6] ^= SHA3.toLane64(message, rr, 48)
-                SHA3.S[11] ^= SHA3.toLane64(message, rr, 56)
-                SHA3.S[16] ^= SHA3.toLane64(message, rr, 64)
-                SHA3.S[21] ^= SHA3.toLane64(message, rr, 72)
-                SHA3.S[ 2] ^= SHA3.toLane64(message, rr, 80)
-                SHA3.S[ 7] ^= SHA3.toLane64(message, rr, 88)
-                SHA3.S[12] ^= SHA3.toLane64(message, rr, 96)
-                SHA3.S[17] ^= SHA3.toLane64(message, rr, 104)
-                SHA3.S[22] ^= SHA3.toLane64(message, rr, 112)
-                SHA3.S[ 3] ^= SHA3.toLane64(message, rr, 120)
-                SHA3.S[ 8] ^= SHA3.toLane64(message, rr, 128)
-                SHA3.S[13] ^= SHA3.toLane64(message, rr, 136)
-                SHA3.S[18] ^= SHA3.toLane64(message, rr, 144)
-                SHA3.S[23] ^= SHA3.toLane64(message, rr, 152)
-                SHA3.S[ 4] ^= SHA3.toLane64(message, rr, 160)
-                SHA3.S[ 9] ^= SHA3.toLane64(message, rr, 168)
-                SHA3.S[14] ^= SHA3.toLane64(message, rr, 176)
-                SHA3.S[19] ^= SHA3.toLane64(message, rr, 184)
-                SHA3.S[24] ^= SHA3.toLane64(message, rr, 192)
-                SHA3.keccakF(SHA3.S)
+                self.S[ 0] ^= SHA3.toLane64(message, rr, 0)
+                self.S[ 5] ^= SHA3.toLane64(message, rr, 8)
+                self.S[10] ^= SHA3.toLane64(message, rr, 16)
+                self.S[15] ^= SHA3.toLane64(message, rr, 24)
+                self.S[20] ^= SHA3.toLane64(message, rr, 32)
+                self.S[ 1] ^= SHA3.toLane64(message, rr, 40)
+                self.S[ 6] ^= SHA3.toLane64(message, rr, 48)
+                self.S[11] ^= SHA3.toLane64(message, rr, 56)
+                self.S[16] ^= SHA3.toLane64(message, rr, 64)
+                self.S[21] ^= SHA3.toLane64(message, rr, 72)
+                self.S[ 2] ^= SHA3.toLane64(message, rr, 80)
+                self.S[ 7] ^= SHA3.toLane64(message, rr, 88)
+                self.S[12] ^= SHA3.toLane64(message, rr, 96)
+                self.S[17] ^= SHA3.toLane64(message, rr, 104)
+                self.S[22] ^= SHA3.toLane64(message, rr, 112)
+                self.S[ 3] ^= SHA3.toLane64(message, rr, 120)
+                self.S[ 8] ^= SHA3.toLane64(message, rr, 128)
+                self.S[13] ^= SHA3.toLane64(message, rr, 136)
+                self.S[18] ^= SHA3.toLane64(message, rr, 144)
+                self.S[23] ^= SHA3.toLane64(message, rr, 152)
+                self.S[ 4] ^= SHA3.toLane64(message, rr, 160)
+                self.S[ 9] ^= SHA3.toLane64(message, rr, 168)
+                self.S[14] ^= SHA3.toLane64(message, rr, 176)
+                self.S[19] ^= SHA3.toLane64(message, rr, 184)
+                self.S[24] ^= SHA3.toLane64(message, rr, 192)
+                self.keccakF(self.S)
                 message = message[rr:]
         else:
             for i in range(0, nnn, rr):
-                SHA3.S[ 0] ^= SHA3.toLane(message, rr, ww,  0)
-                SHA3.S[ 5] ^= SHA3.toLane(message, rr, ww,      ww)
-                SHA3.S[10] ^= SHA3.toLane(message, rr, ww,  2 * ww)
-                SHA3.S[15] ^= SHA3.toLane(message, rr, ww,  3 * ww)
-                SHA3.S[20] ^= SHA3.toLane(message, rr, ww,  4 * ww)
-                SHA3.S[ 1] ^= SHA3.toLane(message, rr, ww,  5 * ww)
-                SHA3.S[ 6] ^= SHA3.toLane(message, rr, ww,  6 * ww)
-                SHA3.S[11] ^= SHA3.toLane(message, rr, ww,  7 * ww)
-                SHA3.S[16] ^= SHA3.toLane(message, rr, ww,  8 * ww)
-                SHA3.S[21] ^= SHA3.toLane(message, rr, ww,  9 * ww)
-                SHA3.S[ 2] ^= SHA3.toLane(message, rr, ww, 10 * ww)
-                SHA3.S[ 7] ^= SHA3.toLane(message, rr, ww, 11 * ww)
-                SHA3.S[12] ^= SHA3.toLane(message, rr, ww, 12 * ww)
-                SHA3.S[17] ^= SHA3.toLane(message, rr, ww, 13 * ww)
-                SHA3.S[22] ^= SHA3.toLane(message, rr, ww, 14 * ww)
-                SHA3.S[ 3] ^= SHA3.toLane(message, rr, ww, 15 * ww)
-                SHA3.S[ 8] ^= SHA3.toLane(message, rr, ww, 16 * ww)
-                SHA3.S[13] ^= SHA3.toLane(message, rr, ww, 17 * ww)
-                SHA3.S[18] ^= SHA3.toLane(message, rr, ww, 18 * ww)
-                SHA3.S[23] ^= SHA3.toLane(message, rr, ww, 19 * ww)
-                SHA3.S[ 4] ^= SHA3.toLane(message, rr, ww, 20 * ww)
-                SHA3.S[ 9] ^= SHA3.toLane(message, rr, ww, 21 * ww)
-                SHA3.S[14] ^= SHA3.toLane(message, rr, ww, 22 * ww)
-                SHA3.S[19] ^= SHA3.toLane(message, rr, ww, 23 * ww)
-                SHA3.S[24] ^= SHA3.toLane(message, rr, ww, 24 * ww)
+                self.S[ 0] ^= SHA3.toLane(message, rr, ww,  0)
+                self.S[ 5] ^= SHA3.toLane(message, rr, ww,      ww)
+                self.S[10] ^= SHA3.toLane(message, rr, ww,  2 * ww)
+                self.S[15] ^= SHA3.toLane(message, rr, ww,  3 * ww)
+                self.S[20] ^= SHA3.toLane(message, rr, ww,  4 * ww)
+                self.S[ 1] ^= SHA3.toLane(message, rr, ww,  5 * ww)
+                self.S[ 6] ^= SHA3.toLane(message, rr, ww,  6 * ww)
+                self.S[11] ^= SHA3.toLane(message, rr, ww,  7 * ww)
+                self.S[16] ^= SHA3.toLane(message, rr, ww,  8 * ww)
+                self.S[21] ^= SHA3.toLane(message, rr, ww,  9 * ww)
+                self.S[ 2] ^= SHA3.toLane(message, rr, ww, 10 * ww)
+                self.S[ 7] ^= SHA3.toLane(message, rr, ww, 11 * ww)
+                self.S[12] ^= SHA3.toLane(message, rr, ww, 12 * ww)
+                self.S[17] ^= SHA3.toLane(message, rr, ww, 13 * ww)
+                self.S[22] ^= SHA3.toLane(message, rr, ww, 14 * ww)
+                self.S[ 3] ^= SHA3.toLane(message, rr, ww, 15 * ww)
+                self.S[ 8] ^= SHA3.toLane(message, rr, ww, 16 * ww)
+                self.S[13] ^= SHA3.toLane(message, rr, ww, 17 * ww)
+                self.S[18] ^= SHA3.toLane(message, rr, ww, 18 * ww)
+                self.S[23] ^= SHA3.toLane(message, rr, ww, 19 * ww)
+                self.S[ 4] ^= SHA3.toLane(message, rr, ww, 20 * ww)
+                self.S[ 9] ^= SHA3.toLane(message, rr, ww, 21 * ww)
+                self.S[14] ^= SHA3.toLane(message, rr, ww, 22 * ww)
+                self.S[19] ^= SHA3.toLane(message, rr, ww, 23 * ww)
+                self.S[24] ^= SHA3.toLane(message, rr, ww, 24 * ww)
                 message = message[rr:]
-                SHA3.keccakF(SHA3.S)
+                self.keccakF(self.S)
         
         # Squeezing phase
         if withReturn:
-            rc = [0] * ((SHA3.n + 7) >> 3)
+            rc = [0] * ((self.n + 7) >> 3)
             ptr = 0
             
-            olen = SHA3.n
+            olen = self.n
             j = 0
             ni = min(25, rr)
             while olen > 0:
                 i = 0
                 while (i < ni) and (j < nn):
-                    v = SHA3.S[(i % 5) * 5 + i // 5]
+                    v = self.S[(i % 5) * 5 + i // 5]
                     for _ in range(ww):
                         if j < nn:
                             rc[ptr] = v & 255
@@ -553,65 +548,65 @@ class SHA3:
                         v >>= 8
                         j += 1
                     i += 1
-                olen -= SHA3.r
+                olen -= self.r
                 if olen > 0:
-                    SHA3.keccakF(SHA3.S)
-            if (SHA3.n & 7) != 0:
-                rc[len(rc) - 1] &= (1 << (SHA3.n & 7)) - 1
+                    self.keccakF(self.S)
+            if (self.n & 7) != 0:
+                rc[len(rc) - 1] &= (1 << (self.n & 7)) - 1
             
             return bytes(rc)
         
-        olen = SHA3.n
-        while olen > SHA3.r:
-            olen -= SHA3.r
-            SHA3.keccakF(SHA3.S)
+        olen = self.n
+        while olen > self.r:
+            olen -= self.r
+            self.keccakF(self.S)
         return None
     
     
-    def simpleSqueeze(times = 1):
+    def simpleSqueeze(self, times = 1):
         '''
         Force some rounds of Keccak-f
         
         @param  times:int  The number of rounds
         '''
         for i in range(times):
-            SHA3.keccakF(SHA3.S)
+            self.keccakF(self.S)
     
     
-    def fastSqueeze(times = 1):
+    def fastSqueeze(self, times = 1):
         '''
         Squeeze as much as is needed to get a digest a number of times
         
         @param  times:int  The number of digests
         '''
         for i in range(times):
-            SHA3.keccakF(SHA3.S) # Last squeeze did not do a ending squeeze
-            olen = SHA3.n
-            while olen > SHA3.r:
-                olen -= SHA3.r
-                SHA3.keccakF(SHA3.S)
+            self.keccakF(self.S) # Last squeeze did not do a ending squeeze
+            olen = self.n
+            while olen > self.r:
+                olen -= self.r
+                self.keccakF(self.S)
     
     
-    def squeeze():
+    def squeeze(self):
         '''
         Squeeze out another digest
         
         @return  :bytes  The hash sum
         '''
-        SHA3.keccakF(SHA3.S) # Last squeeze did not do a ending squeeze
+        self.keccakF(self.S) # Last squeeze did not do a ending squeeze
         
-        nn = (SHA3.n + 7) >> 3
-        ww = SHA3.w >> 3
+        nn = (self.n + 7) >> 3
+        ww = self.w >> 3
         rc = [0] * nn
-        olen = SHA3.n
+        olen = self.n
         j = 0
         ptr = 0
-        ni = min(25, SHA3.r >> 3)
+        ni = min(25, self.r >> 3)
         
         while olen > 0:
             i = 0
             while (i < ni) and (j < nn):
-                v = SHA3.S[(i % 5) * 5 + i // 5]
+                v = self.S[(i % 5) * 5 + i // 5]
                 for _ in range(ww):
                     if j < nn:
                         rc[ptr] = v
@@ -619,12 +614,12 @@ class SHA3:
                     v >>= 8
                     j += 1
                 i += 1
-            olen -= SHA3.r
+            olen -= self.r
             if olen > 0:
-                SHA3.keccakF(SHA3.S)
+                self.keccakF(self.S)
         
-        if (SHA3.n & 7) != 0:
-            rc[len(rc) - 1] &= (1 << (SHA3.n & 7)) - 1
+        if (self.n & 7) != 0:
+            rc[len(rc) - 1] &= (1 << (self.n & 7)) - 1
         
         return bytes(rc)
 
diff --git a/python3/sha3sum.py b/python3/sha3sum.py
index 32a96a7..4143652 100755
--- a/python3/sha3sum.py
+++ b/python3/sha3sum.py
@@ -275,13 +275,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
         sys.exit(3)
     stdin = None
     fail = False
+    sha = SHA3()
     for filename in files:
         rc = ''
         fn = '/dev/stdin' if filename is None else filename
         with open(fn, 'rb') as file:
             try:
                 if (filename is not None) or (stdin is None):
-                    SHA3.initialise(r, c, o)
+                    sha.initialise(r, c, o)
                     blksize = 4096
                     try:
                         blksize = os.stat(os.path.realpath(fn)).st_blksize
@@ -294,7 +295,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                         if len(chunk) == 0:
                             break
                         if not hex:
-                            SHA3.update(chunk)
+                            sha.update(chunk)
                         else:
                             chunk = list(chunk)
                             n = len(chunk) >> 1
@@ -303,24 +304,24 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                                 a = ((a & 15) + (0 if a <= '9' else 9)) << 4
                                 b =  (b & 15) + (0 if b <= '9' else 0)
                                 chunk[_] = a | b
-                            SHA3.update(bytes(chunk), n)
-                    bs = SHA3.digest(j == 1)
+                            sha.update(bytes(chunk), n)
+                    bs = sha.digest(j == 1)
                     if j > 2:
-                        SHA3.fastSqueeze(j - 2)
+                        sha.fastSqueeze(j - 2)
                     if j > 1:
-                        bs = SHA3.squeeze();
+                        bs = sha.squeeze();
                     if filename is None:
                         stdin = bs
                 else:
                     bs = stdin
                 if multi == 0:
                     for _ in range(i - 1):
-                        SHA3.initialise(r, c, o)
-                        bs = SHA3.digest(bs, j == 1)
+                        sha.initialise(r, c, o)
+                        bs = sha.digest(bs, j == 1)
                         if j > 2:
-                            SHA3.fastSqueeze(j - 2)
+                            sha.fastSqueeze(j - 2)
                         if j > 1:
-                            bs = SHA3.squeeze();
+                            bs = sha.squeeze();
                     if binary:
                         sys.stdout.buffer.write(bs)
                     else:
@@ -339,12 +340,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                         rc += '\n'
                         sys.stdout.buffer.write(rc.encode('UTF-8'))
                     for _ in range(i - 1):
-                        SHA3.initialise(r, c, o)
-                        bs = SHA3.digest(bs, j == 1)
+                        sha.initialise(r, c, o)
+                        bs = sha.digest(bs, j == 1)
                         if j > 2:
-                            SHA3.fastSqueeze(j - 2)
+                            sha.fastSqueeze(j - 2)
                         if j > 1:
-                            bs = SHA3.squeeze();
+                            bs = sha.squeeze();
                         if binary:
                             sys.stdout.buffer.write(bs);
                         else: