Merge pull request #65 from JANlittle/main

add algorithm or20_xor_rol19

algorithms/or20_xor_rol19.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+DESCRIPTION = "OR 0x20 and XOR and ROL 19"
+TYPE = 'unsigned_int'
+TEST_1 = 0x186f3f38
+
+
+ROTATE_BITMASK = {
+    8: 0xff,
+    16: 0xffff,
+    32: 0xffffffff,
+    64: 0xffffffffffffffff,
+}
+
+
+def rol(inVal, numShifts, dataSize=32):
+    '''rotate left 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):
+    val = 0xffffffff
+    ors = 0
+    for i in data:
+        ors = i | 32
+        val = ors ^ rol(val, 19, 32)
+    return val