Reverse學習筆記

Reverse學習筆記

rc4

rc4通用指令碼

def rc4(data, key):
    S = list(range(256))
    j = 0
    out = []
 
    for i in range(256):
        j = (j + S[i] + key[i % len(key)]) % 256
        S[i], S[j] = S[j], S[i]
 
    i = j = 0
    for char in data:
        i = (i + 1) % 256
        j = (j + S[i]) % 256
        S[i], S[j] = S[j], S[i]
        out.append(char ^ S[(S[i] + S[j]) % 256])
    return bytes(out)
 
data = bytes([0x02, 0xCC, 0x47, 0xB3, 0x4D, 0x6C, 0xFD, 0x9A, 0x4C, 0x4E,0xD4, 0x8B, 0x1E, 0x81, 0x19, 0x0A, 0x34, 0x26, 0xD0, 0xFF, 0x70, 0xB6, 0xB0, 0x92, 0x49, 0xB3])
key = bytes([0x88, 0xE3, 0xEE, 0x11, 0xC6, 0x49, 0x74, 0xA5, 0xDD, 0x98, 0x59, 0xE9, 0x48, 0xF7, 0x6E, 0xBF, 0x3A, 0xB3, 0x9B, 0xDF,0x10, 0x42, 0xFF, 0x99, 0x6C, 0xE3, 0x3E, 0x05, 0x2C, 0x65, 0x47, 0xEF])
decrypted = rc4(data, key)
print(decrypted)