高校公开

re

fxck

# import base64
# import string

# str1 = "ZmxhZ#tiYXNlNjRfRjRubnl("

# string1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz)!@#$%^&*(+/="
# string2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="

# print(base64.b64decode(str1.translate(str.maketrans(string1, string2))))

# a = "DH~mqqvqxB^||zll@Jq~jkwpmvez{"
# for x in a:
#     print(chr(ord(x) ^ 0x1f), end='')
__b58chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789abcdefghijkmnopqrstuvwxyz'
# base58_tables
__b58base = len(__b58chars)


def b58encode(v):
    """ encode v, which is a string of bytes, to base58.
    """

    long_value = int(v.encode("hex_codec"), 16)

    result = ''
    while long_value >= __b58base:
        div, mod = divmod(long_value, __b58base)
        result = __b58chars[mod] + result
        long_value = div
    result = __b58chars[long_value] + result

    # Bitcoin does a little leading-zero-compression:
    # leading 0-bytes in the input become leading-1s
    nPad = 0
    for c in v:
        if c == '\0':
            nPad += 1
        else:
            break

    return (__b58chars[0] * nPad) + result


def b58decode(v):
    """ decode v into a string of len bytes
    """

    long_value = 0
    for (i, c) in enumerate(v[::-1]):
        long_value += __b58chars.find(c) * (__b58base ** i)

    result = ''
    while long_value >= 256:
        div, mod = divmod(long_value, 256)
        result = chr(mod) + result
        long_value = div
    result = chr(long_value) + result

    nPad = 0
    for c in v:
        if c == __b58chars[0]:
            nPad += 1
        else:
            break

    result = chr(0) * nPad + result
    return result


if __name__ == "__main__":

    # print  "flag{ => "+b58encode("flag{12345678901234567890123456789012}")
    # print  "flag => "+b58encode("flag")
    print(b58decode("4VyhuTqRfYFnQ85Bcw5XcDr3ScNBjf5CzwUdWKVM7SSVqBrkvYGt7SSUJe"))
    # GuHoa5kBDyh9dCH41YguMpnpwE9x3

code = [
    0xC5, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0x01, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0x01, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC4, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC4, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0x01, 0xC5, 0xC5, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xA9, 0xC5, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0xC5, 0x01, 0xC4, 0x01, 0xC5, 0xDD, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0x01, 0xC5, 0xC5, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC4, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC5, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xA9, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0xC4, 0x01, 0x01, 0xDD, 0xC4, 0xC4, 0xA9, 0xC5, 0xC5, 0xC5, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0x01, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC4, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC5, 0xC5, 0x01, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC5, 0xC5, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC5, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0x01, 0xDD, 0xC5, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0x01, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC4, 0xC4, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC4, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0xC4, 0x01, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC5, 0xC5, 0xC5, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC5, 0xC5, 0xC5, 0xC5, 0xC5, 0x01, 0xC5, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xDD, 0xC5, 0xA9, 0xC4, 0xC4, 0xA8, 0xFD, 0xA9, 0xC4, 0x01, 0xC5, 0xDD, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0x01, 0xC5, 0x01, 0xA9, 0xC5, 0xDD, 0xC5, 0xC5, 0xC5, 0xA9, 0xC4, 0xA8, 0xFD, 0xA9, 0xC5, 0xC5, 0x01, 0xC5, 0x01, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0xC4, 0x01]

fuck_len = len(code)
k = 0
arr_500 = [0] * 500
fd_1000 = [0] * 1000
inc = 0
while k < fuck_len:
    if code[k] == 0xDD:
        arr_500[inc] = k
        inc += 1
    if code[k] == 0xfd:
        fd_1000[k] = arr_500[inc - 1]
        fd_1000[arr_500[inc - 1]] = k
        inc += 1
    k += 1
pc = 0
while (pc < fuck_len):
    c = code[pc]
    if c == 0xc4:
        print(pc, "++*index")
    if c == 0xDD:
        print(pc, "if *index==0")
        print("    jmp "+str(fd_1000[pc]+1))
    if c == 0xfd:
        print(pc, "jmp " + str(fd_1000[pc]))
    if c == 0xc5:
        print(pc, "--*index")
    if c == 0xa8:
        print(pc, "++inedx")
    if c == 0xa9:
        print(pc, "--index")
    if c == 1:
        print(pc, "v8++")
        print("     if cipher[v8]!=*index")
        print("         return 0;")

    pc += 1

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