MBE lab01A Ansower Script

http://bit.ly/2Ro0Y7K

the serial computational algorithm in the blow IDA photo,based on the Username where you input.

and the very easy python script is here

username="admin2"  #input username here and makesure username length >5

#username.__len__( ) >5
username_len = username.__len__()
char1 = username[3]
value1= ord(char1) ^ 0x1337
value2 = value1 + 0x5EEDED
counter =0

for i in range(100):
    if counter < username_len:
        char_tem = username[counter]
        if ord(char_tem) < 0x1F:
            return_value = 1
            break
        tem_value3 = ord(char_tem)^ value2
        tem_value4 = ((tem_value3 * 0x88233B2B)& 0xffffffff00000000)>>(2*2*8)

        tem_value5 = tem_value3 - tem_value4
        tem_value5 = tem_value5 >> 1
        tem_value6 = tem_value4 + tem_value5
        tem_value6 = tem_value6 >> 0xa

        tem_value7 = tem_value6 * 0x539
        tem_value8 = tem_value3 - tem_value7
        value2=tem_value8+value2


        counter = counter + 1
    else:
            print("Username:{} ,Serial:{}".format(username,value2))
            break

result：

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http://bit.ly/2WtSWOP reverse engineering, lab1A, MBE, RPISEC, 逆向分析 January 29, 2019 at 01:20PM