anubis c2 dec

dec.py

import base64
import sys

t = []
for i in range(256):
    t.append(i)
bArr = bytearray(sys.argv[1].encode("utf-8"))
i2 = 0

def swap(i,i2,arr):
    i3 = arr[i]
    arr[i] = arr[i2]
    arr[i2] = i3

for i in range(256):
    i2 = (((i2 + t[i])+ bArr[i% len(bArr)]) +256)% 256
    swap(i,i2,t)

b = base64.b64decode(sys.argv[2]).decode()
print(b)
t2 = []
for i in range(int(256/2)):
    t2.append(i)

barr3 = []
for i in range(0,len(b),2):
    barr3.append( (int(b[i],16) << 4) + int(b[i+1],16))

b = 0
c = 0

barr4 = []

for i in range(len(barr3)):
    b = (b+1)%256
    c = (c+t[b])%256
    swap(b,c,t)
    barr4.append(t[(t[b]+t[c])%256] ^ barr3[i])


for i in barr4:
    print(chr(i),end="")

# sample https://twitter.com/Jacob17918360/status/1033177684707356672
# Example usage : python dec.py flash1 MzA5MGMwOGFjNjI5MzkwY2MwODk2ZjMwOTk3OTNjMDIxNzM0YzcyOA== 
# http://supersheet.ga