Added ror8_add_xor variant

algorithms/ror8_add_xor_ab832e83.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+DESCRIPTION = "Hash based on ror8, add, xor with initial state 0x832E83AB"
+# Type can be either 'unsigned_int' (32bit) or 'unsigned_long' (64bit)
+TYPE = 'unsigned_int'
+# Test must match the exact has of the string 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
+TEST_1 = 0x828E7DBD
+
+
+ROTATE_BITMASK = {
+    8: 0xff,
+    16: 0xffff,
+    32: 0xffffffff,
+    64: 0xffffffffffffffff,
+}
+
+def ror(inVal, numShifts, dataSize=32):
+    '''rotate right instruction emulation'''
+    if numShifts == 0:
+        return inVal
+    if (numShifts < 0) or (numShifts > dataSize):
+        raise ValueError('Bad numShifts')
+    if (dataSize != 8) and (dataSize != 16) and (dataSize != 32) and (dataSize != 64):
+        raise ValueError('Bad dataSize')
+    bitMask = ROTATE_BITMASK[dataSize]
+    return bitMask & ((inVal >> numShifts) | (inVal << (dataSize-numShifts)))
+
+def hash(data):
+    state = 0x832E83AB
+    for i in range(len(data)):
+        val = ror(state, 8)
+        if i < len(data) - 1:
+            val += data[i] | data[i + 1] << 8
+        else:
+            val += data[i]
+        state ^= val
+    return state
+