buuoj EasyProgram

flag = open('file.txt','rb').readline()
S=[]
T=[]
for i in range(256):
    S.append(i)

key = "whoami"

for i in range(256):
    T.append(ord(key[i%len(key)]))

j = 0
for i in range(256):
    j = (j+S[i]+T[i])%256
    S[i],S[j] = S[j],S[i]

i = 0
j = 0
x = 0
result = ''
for m in range(38):
    i = (i+1)%256
    j = (j+S[i])%256
    S[i],S[j] = S[j],S[i]
    x = (S[i]+S[j]%256)%256
    result += chr(ord(flag[m])^S[x])

print result   


'''
get buf unsign s[256]
get buf t[256]
we have key:whoami
we have flag:????????????????????????????????

for i:0 to 256
    set s[i]:i

for i:0 to 256
    set t[i]:key[(i)mod(key.lenth)]

for i:0 to 256
    set j:(j+s[i]+t[i])mod(256)
        swap:s[i],s[j]

for m:0 to 38
    set i:(i + 1)mod(256)
    set j:(j + S[i])mod(256)
    swap:s[i],s[j]
    set x:(s[i] + (s[j]mod(256))mod(256))
    set flag[m]:flag[m]^s[x]

fprint flagx to file
'''