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MixCols.py
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MixCols.py
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from PrintHexMatrix import PrintHexMatrix
'''
Take a List of lists and returns a list of lists
Inner lists are of type String, In Hex format
'''
def MixCols(matrix):
Rijndael=[[02,03,01,01],[01,02,03,01],[01,01,02,03],[03,01,01,02]]
holder=[]
d=[]
for i in range(4):
for j in range(4):
for k in range(4):
holder.append((_Shift(matrix[k][j],Rijndael[i][k])))
d.append(holder)
holder=[]
for row in d:
temp=0
for x in range(4):
temp=temp^row[x]
holder.append(temp)
retmatrix=[map(lambda a: format(holder[a],'02X'),range(b*4,b*4+4)) for b in range(4)]
return retmatrix
def _Shift(Element, Range):
a=int(Element, 16)
if(Range>1):
a=a<<1
# a=int(binformat(a),2)
if(int(Element,16)>127):
a=a^27
a=a-256
if(Range>2):
a=a^int(Element,16)
return a
if __name__=='__main__':
b= [['7C','6B','01','D7'],['F2','30','FE','63'],['2B','76','7B','C5'],['AB','77','6F','67']]
print MixCols(b)
#print binformat(Shift("87",2))
#print binformat(Shift("6E",3))
#print binformat(Shift("46",1))
#print binformat(Shift("A6",1))
#
# print hex(Shift("87",2)^Shift("6E",3)^Shift("46",1)^Shift("A6",1))
#b=np.array([[int(raw_input(),16),int(raw_input(),16),int(raw_input(),16),int(raw_input(),16)],[int(raw_input(),16),int(raw_input(),16),int(raw_input(),16),int(raw_input(),16)],[int(raw_input(),16),int(raw_input(),16),int(raw_input(),16),int(raw_input(),16)],[int(raw_input(),16),int(raw_input(),16),int(raw_input(),16),int(raw_input(),16)]])
#b=[[135, 242, 77, 151],[ 99, 76, 144, 236],[ 70, 55, 74, 195],[166, 140, 216, 149]]
# b= [['87','F2','4D','97'],['6E','4C','90','EC'],['46','E7','4A','C3'],['A6','8C','D8','95']]