2021羊城杯比赛复现（Crypto）
bigrsa
题目：
from Crypto.Util.number import *
from flag import *
n1 = 103835296409081751860770535514746586815395898427260334325680313648369132661057840680823295512236948953370895568419721331170834557812541468309298819497267746892814583806423027167382825479157951365823085639078738847647634406841331307035593810712914545347201619004253602692127370265833092082543067153606828049061
n2 = 115383198584677147487556014336448310721853841168758012445634182814180314480501828927160071015197089456042472185850893847370481817325868824076245290735749717384769661698895000176441497242371873981353689607711146852891551491168528799814311992471449640014501858763495472267168224015665906627382490565507927272073
e = 65537
m = bytes_to_long(flag)
c = pow(m, e, n1)
c = pow(c, e, n2)
print("c = %d" % c)
# output
# c = 60406168302768860804211220055708551816238816061772464557956985699400782163597251861675967909246187833328847989530950308053492202064477410641014045601986036822451416365957817685047102703301347664879870026582087365822433436251615243854347490600004857861059245403674349457345319269266645006969222744554974358264
思路：没什么好说的，因为给了两个n，所以可以考虑找两个n的公因数来分解n
RingRingRing
题目：
这是一个与密码系统交互的题，流程大概就是先是一个hash验证，然后要求输入100轮的a、b、c、d、e，满足\(a^4+b^4+c^4+d^4=e^2\)，但是它没有要求abcd不能一样，只要求了不能输入0和不能重复，所以可以将a,b,c,d当做同一个值来看待，于是就有了\(4a^4=e^2\)，\(2a^2=e\)的情况，当然100轮输入，自己手打肯定是不行的（我自己最高也就手打到65轮），所以要写个脚本来交互
由于需要交互，所以需要python中的pwntools这个扩展包来搞定。
下面是几个脚本的汇总（看着别人的脚本，感觉自己写的简直……）
#我自己写的，勉强能用
from pwn import *
import hashlib
#context.log_level = "debug"
sock = remote('192.168.40.249',2378)
back1=sock.recvline()
print(back1) #打印返回值
md5send=b'0'
a1=back1[36:40]
a2=back1[50:55]
b1=str(a1)[2:-1]
b2=str(a2)[2:-1]
print(b1)
print(b2)
for i in range(10000000):
if hashlib.md5((str(i) + b1).encode("utf-8")).hexdigest()[0:5] == b2:
md5send=str(i)
break
sock.sendline(md5send)
print(sock.recvline())
for i in range(1,101):
print(i)
sock.recv(1024)
sock.send(str(i))
sock.recv(1024)
sock.send(str(i))
sock.recv(1024)
sock.send(str(i))
sock.recv(1024)
sock.send(str(i))
sock.recv(1024)
sock.send(str(2*(i**2)))
print(sock.recvline())
#某个大佬给我的
import hashlib
from pwn import *
def r_md5(s1, s2):
for i in range(10000000):
if hashlib.md5((str(i) + s1).encode("utf-8")).hexdigest()[0:5] == s2:
return str(i)
res = [[1,2],[2,8],[3,18],[4,32],[5,50],[6,72],[7,98],[8,128],[9,162],[10,200],[11,242],[12,288],[13,338],[14,392],[15,450],[16,512],[17,578],[18,648],[19,722],[20,800],[21,882],[22,968],[23,1058],[24,1152],[25,1250],[26,1352],[27,1458],[28,1568],[29,1682],[30,1800],[31,1922],[32,2048],[33,2178],[34,2312],[35,2450],[36,2592],[37,2738],[38,2888],[39,3042],[40,3200],[41,3362],[42,3528],[43,3698],[44,3872],[45,4050],[46,4232],[47,4418],[48,4608],[49,4802],[50,5000],[51,5202],[52,5408],[53,5618],[54,5832],[55,6050],[56,6272],[57,6498],[58,6728],[59,6962],[60,7200],[61,7442],[62,7688],[63,7938],[64,8192],[65,8450],[66,8712],[67,8978],[68,9248],[69,9522],[70,9800],[71,10082],[72,10368],[73,10658],[74,10952],[75,11250],[76,11552],[77,11858],[78,12168],[79,12482],[80,12800],[81,13122],[82,13448],[83,13778],[84,14112],[85,14450],[86,14792],[87,15138],[88,15488],[89,15842],[90,16200],[91,16562],[92,16928],[93,17298],[94,17672],[95,18050],[96,18432],[97,18818],[98,19208],[99,19602],[100,20000]]
if __name__ == "__main__":
#context.log_level = "debug"
p = remote('192.168.40.249', 2378)
s = str(p.recvline())
s1, s2 = s[38:42], s[52:57]
xxxxx = r_md5(s1,s2)
print(xxxxx)
p.recv(1024)
p.sendline(xxxxx)
p.recvline()
p.recvline()
for i in range(100):
p.recv(1024)
p.sendline(str(res[i][0]))
p.recv(1024)
p.sendline(str(res[i][0]))
p.recv(1024)
p.sendline(str(res[i][0]))
p.recv(1024)
p.sendline(str(res[i][0]))
p.recv(1024)
p.sendline(str(res[i][1]))
p.recvline()
p.recvline()
p.recvline()
p.recvline()
# 商业转载请联系作者获得授权，非商业转载请注明出处。
# For commercial use, please contact the author for authorization. For non-commercial use, please indicate the source.
# 协议(License)：署名-非商业性使用-相同方式共享 4.0 国际 (CC BY-NC-SA 4.0)
# 作者(Author)：
# 链接(URL)：https://www.wkr.moe/ctf/562.html
# 来源(Source)：
from hashlib import md5
from string import digits, ascii_lowercase
from pwn import connect
def go(strend, hashstart):
hexdigits = digits+ascii_lowercase[0:6]
for i in hexdigits:
for j in hexdigits:
for k in hexdigits:
for l in hexdigits:
for m in hexdigits:
for n in hexdigits:
str = i + j + k + l + m + n
if md5(f'{str}{strend}'.encode()).hexdigest()[0:5] == hashstart:
return str
if __name__ == '__main__':
conn = connect('192.168.39.181', 2378)
prevQ = conn.recvuntil(b'[>] Give me xxxxx: ')
print(prevQ[36:40].decode(), prevQ[50:55].decode())
prevA = go(prevQ[36:40].decode(), prevQ[50:55].decode())
conn.sendline(prevA.encode())
print(conn.recvlines(2))
for _ in range(1, 101):
for __ in range(4):
#输入一样的abcd
print(conn.recvn(7))
conn.send(str(_).encode())
#输入不一样的e
print(conn.recvn(7))
conn.send(str((_ ** 2) * 2).encode())
#接收每一轮返回的‘You are right’
print(conn.recvlines(1))
print(conn.recvlines(1)) # flag
conn.close()
最后一个脚本的来源
RSA?
题目：
import os
from Crypto.Util.number import *
flag = "GWHT{xxxxxxxxx}"
p = getPrime(256)
q = getPrime(256)
n = p*q
N = (p-1)*(q-1)
e = 65537
Mx = bytes_to_long(os.urandom(30))
My = bytes_to_long(flag)
Z1 = (Mx*My)%n
inv_Z1 = inverse_mod(Z1, n)
inv_2 = inverse_mod(2, n)
X = ((Z1+inv_Z1)*inv_2)%n
Y = My
inv_Y = inverse_mod(Y, n)
a = ((inv_Z1-X)*inv_Y)%n
D = (a*a)%n
xy = lambda (x1,y1),(x2,y2) : ((x1*x2+D*y1*y2)%n, (x1*y2+x2*y1)%n)
def getloop((x,y), e):
ret = (x, y)
for i in range(e-1):
ret = xy(ret, (x,y))
return ret
print n
print getloop((X, Y), e)
print a
# 13390709926509813526471364597371124446888078365567927211781799241724742352679484983709219580483800891886832613684875066109177882219522305348565532970795023
# (5404548088049249951619519701935576492239293254135836357417714329205323074367876875480850741613547220698045360461761929952847796420174204143917852624050110, 2110372753170830610718226848526649992911771424441223687775304654852191999130502986109306355582366065947895295520226816523397652918227241733632791793362785)
# 1762039418842677123086894939949574689744108610561557889235294034870342076452734215004689409493802437034960516295735815195656138656970901855976802991519141
过程：
略过前面的RSA参数赋值，开始看：
Mx = bytes_to_long(os.urandom(30))
My = bytes_to_long(flag)
Z1 = (Mx*My)%n
inv_Z1 = inverse_mod(Z1, n)
inv_2 = inverse_mod(2, n)
Mx和My分别是随机生成的大小（长度）为30的字符串和flag对应的长整数，用数学公式表示为：
\[inv\_Z_1=\frac{1}{Z_1}\\
inv\_2=\frac{1}{2}
\]
X = ((Z1+inv_Z1)*inv_2)%n
Y = My
inv_Y = inverse_mod(Y, n)
表示为：
\[\begin{equation}
\begin{aligned}
X&=(Z_1+\frac{1}{Z_1})*\frac{1}{2}\ mod\ n \\
&=(M_XM_y+\frac{1}{M_xM_y})*\frac{1}{2}\ mod\ n \\
&=\frac{1+M_x^2M_y^2}{2M_xM_y} \\
Y&=M_y \\
in&v\_Y=\frac{1}{M_y}
\end{aligned}
\end{equation}
\]
a = ((inv_Z1-X)inv_Y)%n
D = (aa)%n
\[\begin{equation}
\begin{aligned}
a&=((\frac{1}{Z_1}-X)*\frac{1}{Y})\ mod\ n \\
&=((\frac{2-1-M_x^2M_y^2}{2M_xM_y})*\frac{1}{M_y})\ mod\ n \\
&=\frac{1-M_x^2M_y^2}{2M_xM_y^2}\ mod\ n \\
D&=\frac{(1-M_x^2M_y^2)^2}{4M_x^2M_y^4}\ mod\ n
\end{aligned}
\end{equation}
\]
xy = lambda (x1,y1),(x2,y2) : ((x1x2+Dy1y2)%n, (x1y2+x2*y1)%n)
def getloop((x,y), e):
ret = (x, y)
for i in range(e-1):
ret = xy(ret, (x,y))
return ret
这段代码是非常难顶的，因为它看起来好大，当时做题的时候我看了看，感觉好像会很长，下意识的认为这个没办法列出来具体的数学公式，而且它看起来类似分组密码。
公式如下：
\[\begin{equation}
\begin{aligned}
&n=0,X_0=X=\frac{1+M_x^2M_y^2}{2M_xM_y},Y_0=M_y \\
&n=1,X_1=\frac{1+M_x^4M_y^4}{2M_x^2M_y^2},Y_1=\frac{1+M_x^2M_y^2}{M_x} \\
&n=2,X_2=\frac{1+M_x^6M_y^6}{2M_x^3M_y^3},Y_2=\frac{1+M_x^2M_y^2+M_x^4M_y^4}{M_x^2M_y}
\end{aligned}
\end{equation}
\]
所以，以此类推，可得：
\[X_n=\frac{1+M_x^{2n+2}M_y^{2n+2}}{2M_x^{n+1}M_y^{n+1}},Y_n=\frac{\sum_{i=0}^{n}M_x^{2n}M_y^{2n}}{M_x^nM_y^{n-1}}
\]
然后则是关键点：要用Yn乘a来完成Yn与Xn之间的联系：
\[\begin{equation}
\begin{aligned}
Y_n*a&=\frac{\sum_{i=0}^{n}M_x^{2n}M_y^{2n}}{M_x^nM_y^{n-1}}*\frac{1-M_x^2M_y^2}{2M_xM_y^2} \\
&=\frac{1-M_x^{2n+2}M_y^{2n+2}}{2M_x^{n+1}M_y^{n+1}} \\
&=X_n-\frac{2M_x^{2n+2}M_y^{2n+2}}{2M_x^{n+1}M_y^{n+1}} \\
&=X_n-M_x^{n+1}M_y^{n+1}(注意这里不是X_n-M_x^{2}M_y^{2})
\end{aligned}
\end{equation}
\]
又因为\(Y_n、X_n、a\)三个量是已知的，所以可以求得\(M_x^{n+1}M_y^{n+1}\)的值（这里的n是e-1）也就是\((M_xM_y)^e(mod\ n)\)，而这个形式也是RSA加密的形式，那么需要找到e在模n的逆元d。这道题并没有给出关于n的分解的提示，那么尝试用yafu分解，可以得到：
fac: factoring 13390709926509813526471364597371124446888078365567927211781799241724742352679484983709219580483800891886832613684875066109177882219522305348565532970795023
fac: using pretesting plan: normal
fac: no tune info: using qs/gnfs crossover of 95 digits
div: primes less than 10000
fmt: 1000000 iterations
Total factoring time = 0.1120 secondsfactors found
P78 = 115718235064789220654263009993128325569382592506655305434488398268608329541037
P78 = 115718235064789220654263009993128324769382192706654302434478391267607309966379ans = 1
到了这一步以后，就会发现解出来是\(M_xM_y\)，而flag是\(M_y\)，那么可以找一找公式中\(M_x/M_y\)不是齐次的有a和D（其实这两个等价）又因为给出了a的值，所以a和D都可以来求出\(M_y\)：
\[\begin{equation}
\begin{aligned}
a&=\frac{1-M_x^2M_y^2}{2M_xM_y^2} \\
M_y&=\frac{1-(M_xM_y)^2}{2aM_xM_y}
\end{aligned}
\end{equation}
\]
脚本：
from Crypto.Util.number import long_to_bytes
from gmpy2 import invert
p=115718235064789220654263009993128324769382192706654302434478391267607309966379
q=115718235064789220654263009993128325569382592506655305434488398268608329541037
n=p*q
X_n=5404548088049249951619519701935576492239293254135836357417714329205323074367876875480850741613547220698045360461761929952847796420174204143917852624050110
Y_n=2110372753170830610718226848526649992911771424441223687775304654852191999130502986109306355582366065947895295520226816523397652918227241733632791793362785
a=1762039418842677123086894939949574689744108610561557889235294034870342076452734215004689409493802437034960516295735815195656138656970901855976802991519141
e=65537
d=invert(e,(p-1)*(q-1))
MXMY=pow((X_n-Y_n*a)%n,d,p*q)
MY=(1-MXMY**2)*invert(2,n)*invert(MXMY,n)*invert(a,n) %n
#这里一定要有一个模n的操作，不然会得到一个负数，并且这里也不能直接除以2*a*MXMY，一定得是它们的模n的逆元
print(long_to_bytes(MY))
GWHT{pell_equation_is_very_interesting}
今天看博客，发现有一个wp里面说这个方程很像Pell方程，可以参考这篇文章：佩尔（Pell）方程，而这篇论文A PUBLIC KEY CRYPTOSYSTEM BASED ON PELL EQUATION则讲述了一个基于Pell方程的公钥密码系统，可以拿来参考一下~
easy_rsa
easyrsa就从来都没有easy过……
题目：
from Crypto.Util.number import *
from flag import flag
import gmpy2
def gen_prime(nbits, gamma):
g = getPrime(int(nbits * gamma)) #491
alpha = 0.5 - gamma #0.02
while True:
a = getRandomNBitInteger(int(alpha * nbits)) #20
p = 2 * g * a + 1
if isPrime(p):
b = getRandomNBitInteger(int(alpha * nbits))
q = 2 * g * b + 1
h = 2 * g * a * b + a + b
while not isPrime(q) or isPrime(h) or gmpy2.gcd(a, b) != 1: #保证q是素数，h不是素数，a、b没有公约数
b = getRandomNBitInteger(int(alpha * nbits))
q = 2 * g * b + 1
return p, q
def encrypt(nbits, gamma):
p, q = gen_prime(nbits, gamma)
n = p * q
e = getPrime(16)
while gmpy2.gcd(e, gmpy2.lcm(p-1,q-1)) != 1:
e = getPrime(16)
m = bytes_to_long(flag)
c = pow(m, e, n)
return n, e, c
n, e, c = encrypt(1024, 0.48)
print 'n =', n
print 'e =', e
print 'c =', c
# n = 84236796025318186855187782611491334781897277899439717384242559751095347166978304126358295609924321812851255222430530001043539925782811895605398187299748256080526691975084042025794113521587064616352833904856626744098904922117855866813505228134381046907659080078950018430266048447119221001098505107823645953039
# e = 58337
# c = 13646200911032594651110040891135783560995665642049282201695300382255436792102048169200570930229947213493204600006876822744757042959653203573780257603577712302687497959686258542388622714078571068849217323703865310256200818493894194213812410547780002879351619924848073893321472704218227047519748394961963394668
这道题的解法主要在于Pollard's rho algorithm的修改应用，具体的参考来源为：RSA - Large Common Factor of p-1 and q-1，但可惜的是我并不知道里面的原理……大佬写的太简略了啊~
结论反正就是用\(x^{N-1}+3\)来代替rho中的迭代函数，能在比较短的时间里分解N
拿大佬的脚本修改后就可以得到解题脚本：
from Crypto.Util.number import *
from gmpy2 import invert
def f(x, n):
return (pow(x, n - 1, n) + 3) % n
def rho(n):
i = 1
while True:
a = getRandomRange(2, n)
b = f(a, n)
j = 1
while True:
p = GCD(abs(a - b), n)
print('{} in {} circle'.format(j, i))
if p == n:
break
elif p > 1:
return (p, n // p)
else:
a = f(a, n)
b = f(f(b, n), n)
j += 1
i += 1
n = 84236796025318186855187782611491334781897277899439717384242559751095347166978304126358295609924321812851255222430530001043539925782811895605398187299748256080526691975084042025794113521587064616352833904856626744098904922117855866813505228134381046907659080078950018430266048447119221001098505107823645953039
c=13646200911032594651110040891135783560995665642049282201695300382255436792102048169200570930229947213493204600006876822744757042959653203573780257603577712302687497959686258542388622714078571068849217323703865310256200818493894194213812410547780002879351619924848073893321472704218227047519748394961963394668
e=58337
p,q=rho(n)
d=invert(e,(p-1)*(q-1))
print(long_to_bytes(pow(c,d,n)))
b'SangFor{0a8c2220-4c1b-32c8-e8c1-adf92ec7678b}'
miss
题目：
簜9 %k? 櫌m O
题目脚本：
#!/usr/bin/env python3
from Crypto import Random
S_BOX = [
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,]
RCON_BOX = [
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef,
0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b,
0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3,
0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20,
0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35,
0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04,
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63,
0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d]
GF_MULT_1 = [
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,
0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,
0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,
0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff]
GF_MULT_2 = [
0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e,
0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e,
0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e,
0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e,
0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e,0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e,
0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe,
0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde,
0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee,0xf0,0xf2,0xf4,0xf6,0xf8,0xfa,0xfc,0xfe,
0x1b,0x19,0x1f,0x1d,0x13,0x11,0x17,0x15,0x0b,0x09,0x0f,0x0d,0x03,0x01,0x07,0x05,
0x3b,0x39,0x3f,0x3d,0x33,0x31,0x37,0x35,0x2b,0x29,0x2f,0x2d,0x23,0x21,0x27,0x25,
0x5b,0x59,0x5f,0x5d,0x53,0x51,0x57,0x55,0x4b,0x49,0x4f,0x4d,0x43,0x41,0x47,0x45,
0x7b,0x79,0x7f,0x7d,0x73,0x71,0x77,0x75,0x6b,0x69,0x6f,0x6d,0x63,0x61,0x67,0x65,
0x9b,0x99,0x9f,0x9d,0x93,0x91,0x97,0x95,0x8b,0x89,0x8f,0x8d,0x83,0x81,0x87,0x85,
0xbb,0xb9,0xbf,0xbd,0xb3,0xb1,0xb7,0xb5,0xab,0xa9,0xaf,0xad,0xa3,0xa1,0xa7,0xa5,
0xdb,0xd9,0xdf,0xdd,0xd3,0xd1,0xd7,0xd5,0xcb,0xc9,0xcf,0xcd,0xc3,0xc1,0xc7,0xc5,
0xfb,0xf9,0xff,0xfd,0xf3,0xf1,0xf7,0xf5,0xeb,0xe9,0xef,0xed,0xe3,0xe1,0xe7,0xe5]
GF_MULT_3 = [
0x00,0x03,0x06,0x05,0x0c,0x0f,0x0a,0x09,0x18,0x1b,0x1e,0x1d,0x14,0x17,0x12,0x11,
0x30,0x33,0x36,0x35,0x3c,0x3f,0x3a,0x39,0x28,0x2b,0x2e,0x2d,0x24,0x27,0x22,0x21,
0x60,0x63,0x66,0x65,0x6c,0x6f,0x6a,0x69,0x78,0x7b,0x7e,0x7d,0x74,0x77,0x72,0x71,
0x50,0x53,0x56,0x55,0x5c,0x5f,0x5a,0x59,0x48,0x4b,0x4e,0x4d,0x44,0x47,0x42,0x41,
0xc0,0xc3,0xc6,0xc5,0xcc,0xcf,0xca,0xc9,0xd8,0xdb,0xde,0xdd,0xd4,0xd7,0xd2,0xd1,
0xf0,0xf3,0xf6,0xf5,0xfc,0xff,0xfa,0xf9,0xe8,0xeb,0xee,0xed,0xe4,0xe7,0xe2,0xe1,
0xa0,0xa3,0xa6,0xa5,0xac,0xaf,0xaa,0xa9,0xb8,0xbb,0xbe,0xbd,0xb4,0xb7,0xb2,0xb1,
0x90,0x93,0x96,0x95,0x9c,0x9f,0x9a,0x99,0x88,0x8b,0x8e,0x8d,0x84,0x87,0x82,0x81,
0x9b,0x98,0x9d,0x9e,0x97,0x94,0x91,0x92,0x83,0x80,0x85,0x86,0x8f,0x8c,0x89,0x8a,
0xab,0xa8,0xad,0xae,0xa7,0xa4,0xa1,0xa2,0xb3,0xb0,0xb5,0xb6,0xbf,0xbc,0xb9,0xba,
0xfb,0xf8,0xfd,0xfe,0xf7,0xf4,0xf1,0xf2,0xe3,0xe0,0xe5,0xe6,0xef,0xec,0xe9,0xea,
0xcb,0xc8,0xcd,0xce,0xc7,0xc4,0xc1,0xc2,0xd3,0xd0,0xd5,0xd6,0xdf,0xdc,0xd9,0xda,
0x5b,0x58,0x5d,0x5e,0x57,0x54,0x51,0x52,0x43,0x40,0x45,0x46,0x4f,0x4c,0x49,0x4a,
0x6b,0x68,0x6d,0x6e,0x67,0x64,0x61,0x62,0x73,0x70,0x75,0x76,0x7f,0x7c,0x79,0x7a,
0x3b,0x38,0x3d,0x3e,0x37,0x34,0x31,0x32,0x23,0x20,0x25,0x26,0x2f,0x2c,0x29,0x2a,
0x0b,0x08,0x0d,0x0e,0x07,0x04,0x01,0x02,0x13,0x10,0x15,0x16,0x1f,0x1c,0x19,0x1a]
def rotWord(byteArray):
res = bytearray()
res.append(byteArray[1])
res.append(byteArray[2])
res.append(byteArray[3])
res.append(byteArray[0])
return res
def subWord(byteArray):
res = bytearray()
for b in byteArray:
res.append( S_BOX[b] )
return res
def rcon(i):
res = bytearray()
res.append(RCON_BOX[i])
res.append(0)
res.append(0)
res.append(0)
return res
def xor(byteArray1, byteArray2):
res = bytearray()
for b1, b2 in zip(byteArray1, byteArray2):
res.append(b1 ^ b2)
return res
def keyExpansion(key,round):
lastcolumn = key[-4:]
resRcon = rotWord(lastcolumn)
resSub = subWord(resRcon)
res1XOR = xor(resSub,key[:4])
newFirstColumn = xor(res1XOR,rcon(round))
newKey = newFirstColumn
for i in range(1,4):
part1XOR = newKey[-4:]
part2XOR = key[i*4:(i+1)*4]
newKey += xor(part1XOR, part2XOR)
return newKey
def subBytes(aesState):
resState = bytearray()
for i in range(0,len(aesState),4):
resState[i:i+4] = subWord(aesState[i:i+4])
return resState
def shiftRow(aesState):
resState = bytearray()
newPosition = [ 0, 5, 0xa, 0xf,4, 9, 0xe, 3,8, 0xd, 2, 7, 0xc, 1, 6, 0xb ]
for i in newPosition:
resState.append(aesState[i])
return resState
def mixColumn(aesState):
res = bytearray()
for i in range(0,len(aesState),4):
b0, b1, b2, b3 = aesState[i:i+4]
new_b0 = GF_MULT_2[b0] ^ GF_MULT_3[b1] ^ GF_MULT_1[b2] ^ GF_MULT_1[b3]
new_b1 = GF_MULT_1[b0] ^ GF_MULT_2[b1] ^ GF_MULT_3[b2] ^ GF_MULT_1[b3]
new_b2 = GF_MULT_1[b0] ^ GF_MULT_1[b1] ^ GF_MULT_2[b2] ^ GF_MULT_3[b3]
new_b3 = GF_MULT_3[b0] ^ GF_MULT_1[b1] ^ GF_MULT_1[b2] ^ GF_MULT_2[b3]
res.append(new_b0)
res.append(new_b1)
res.append(new_b2)
res.append(new_b3)
return res
def AES_Encryption(plainText, AES_key, nbRound):
res = bytearray()
plainTextBytes = plainText
KeyList = [AES_key]
for i in range(1, nbRound+1):
KeyList.append(keyExpansion(KeyList[-1],i))
res = plainTextBytes
for i in range(1,nbRound):
res = subBytes(res)
res = shiftRow(res)
res = mixColumn(res)
key = KeyList[i]
res = subBytes(res)
res = shiftRow(res)
return res
def StringToByteArray(msg):
return [ord(x) for x in msg]
def ByteArrayToString(cipher):
return ''.join([chr(x) for x in cipher])
def main():
AES_Key = Random.get_random_bytes(16)
with open("flag.txt","rb") as f_in:
flag = f_in.read()
cipherText = AES_Encryption(flag, AES_Key,10)
with open("cipher.txt","wb") as f_out:
f_out.write(cipherText)
if __name__ == '__main__':
main()
解题脚本：
# -*- coding: utf-8 -*-
"""
Created on Tue Sep 14 23:19:19 2021
@author: 01am
"""
S_BOX = [
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,]
S_INV_BOX = [
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d]
RCON_BOX = [
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef,
0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b,
0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3,
0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20,
0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35,
0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04,
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63,
0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d]
GF_MULT_1 = [
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,
0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,
0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,
0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff]
GF_MULT_2 = [
0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e,
0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e,
0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e,
0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e,
0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e,0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e,
0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe,
0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde,
0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee,0xf0,0xf2,0xf4,0xf6,0xf8,0xfa,0xfc,0xfe,
0x1b,0x19,0x1f,0x1d,0x13,0x11,0x17,0x15,0x0b,0x09,0x0f,0x0d,0x03,0x01,0x07,0x05,
0x3b,0x39,0x3f,0x3d,0x33,0x31,0x37,0x35,0x2b,0x29,0x2f,0x2d,0x23,0x21,0x27,0x25,
0x5b,0x59,0x5f,0x5d,0x53,0x51,0x57,0x55,0x4b,0x49,0x4f,0x4d,0x43,0x41,0x47,0x45,
0x7b,0x79,0x7f,0x7d,0x73,0x71,0x77,0x75,0x6b,0x69,0x6f,0x6d,0x63,0x61,0x67,0x65,
0x9b,0x99,0x9f,0x9d,0x93,0x91,0x97,0x95,0x8b,0x89,0x8f,0x8d,0x83,0x81,0x87,0x85,
0xbb,0xb9,0xbf,0xbd,0xb3,0xb1,0xb7,0xb5,0xab,0xa9,0xaf,0xad,0xa3,0xa1,0xa7,0xa5,
0xdb,0xd9,0xdf,0xdd,0xd3,0xd1,0xd7,0xd5,0xcb,0xc9,0xcf,0xcd,0xc3,0xc1,0xc7,0xc5,
0xfb,0xf9,0xff,0xfd,0xf3,0xf1,0xf7,0xf5,0xeb,0xe9,0xef,0xed,0xe3,0xe1,0xe7,0xe5]
GF_MULT_3 = [
0x00,0x03,0x06,0x05,0x0c,0x0f,0x0a,0x09,0x18,0x1b,0x1e,0x1d,0x14,0x17,0x12,0x11,
0x30,0x33,0x36,0x35,0x3c,0x3f,0x3a,0x39,0x28,0x2b,0x2e,0x2d,0x24,0x27,0x22,0x21,
0x60,0x63,0x66,0x65,0x6c,0x6f,0x6a,0x69,0x78,0x7b,0x7e,0x7d,0x74,0x77,0x72,0x71,
0x50,0x53,0x56,0x55,0x5c,0x5f,0x5a,0x59,0x48,0x4b,0x4e,0x4d,0x44,0x47,0x42,0x41,
0xc0,0xc3,0xc6,0xc5,0xcc,0xcf,0xca,0xc9,0xd8,0xdb,0xde,0xdd,0xd4,0xd7,0xd2,0xd1,
0xf0,0xf3,0xf6,0xf5,0xfc,0xff,0xfa,0xf9,0xe8,0xeb,0xee,0xed,0xe4,0xe7,0xe2,0xe1,
0xa0,0xa3,0xa6,0xa5,0xac,0xaf,0xaa,0xa9,0xb8,0xbb,0xbe,0xbd,0xb4,0xb7,0xb2,0xb1,
0x90,0x93,0x96,0x95,0x9c,0x9f,0x9a,0x99,0x88,0x8b,0x8e,0x8d,0x84,0x87,0x82,0x81,
0x9b,0x98,0x9d,0x9e,0x97,0x94,0x91,0x92,0x83,0x80,0x85,0x86,0x8f,0x8c,0x89,0x8a,
0xab,0xa8,0xad,0xae,0xa7,0xa4,0xa1,0xa2,0xb3,0xb0,0xb5,0xb6,0xbf,0xbc,0xb9,0xba,
0xfb,0xf8,0xfd,0xfe,0xf7,0xf4,0xf1,0xf2,0xe3,0xe0,0xe5,0xe6,0xef,0xec,0xe9,0xea,
0xcb,0xc8,0xcd,0xce,0xc7,0xc4,0xc1,0xc2,0xd3,0xd0,0xd5,0xd6,0xdf,0xdc,0xd9,0xda,
0x5b,0x58,0x5d,0x5e,0x57,0x54,0x51,0x52,0x43,0x40,0x45,0x46,0x4f,0x4c,0x49,0x4a,
0x6b,0x68,0x6d,0x6e,0x67,0x64,0x61,0x62,0x73,0x70,0x75,0x76,0x7f,0x7c,0x79,0x7a,
0x3b,0x38,0x3d,0x3e,0x37,0x34,0x31,0x32,0x23,0x20,0x25,0x26,0x2f,0x2c,0x29,0x2a,
0x0b,0x08,0x0d,0x0e,0x07,0x04,0x01,0x02,0x13,0x10,0x15,0x16,0x1f,0x1c,0x19,0x1a]
GF_MULT_09 = [
0x00,0x09,0x12,0x1b,0x24,0x2d,0x36,0x3f,0x48,0x41,0x5a,0x53,0x6c,0x65,0x7e,0x77,
0x90,0x99,0x82,0x8b,0xb4,0xbd,0xa6,0xaf,0xd8,0xd1,0xca,0xc3,0xfc,0xf5,0xee,0xe7,
0x3b,0x32,0x29,0x20,0x1f,0x16,0x0d,0x04,0x73,0x7a,0x61,0x68,0x57,0x5e,0x45,0x4c,
0xab,0xa2,0xb9,0xb0,0x8f,0x86,0x9d,0x94,0xe3,0xea,0xf1,0xf8,0xc7,0xce,0xd5,0xdc,
0x76,0x7f,0x64,0x6d,0x52,0x5b,0x40,0x49,0x3e,0x37,0x2c,0x25,0x1a,0x13,0x08,0x01,
0xe6,0xef,0xf4,0xfd,0xc2,0xcb,0xd0,0xd9,0xae,0xa7,0xbc,0xb5,0x8a,0x83,0x98,0x91,
0x4d,0x44,0x5f,0x56,0x69,0x60,0x7b,0x72,0x05,0x0c,0x17,0x1e,0x21,0x28,0x33,0x3a,
0xdd,0xd4,0xcf,0xc6,0xf9,0xf0,0xeb,0xe2,0x95,0x9c,0x87,0x8e,0xb1,0xb8,0xa3,0xaa,
0xec,0xe5,0xfe,0xf7,0xc8,0xc1,0xda,0xd3,0xa4,0xad,0xb6,0xbf,0x80,0x89,0x92,0x9b,
0x7c,0x75,0x6e,0x67,0x58,0x51,0x4a,0x43,0x34,0x3d,0x26,0x2f,0x10,0x19,0x02,0x0b,
0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8,0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0,
0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78,0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30,
0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5,0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed,
0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35,0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d,
0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e,0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6,
0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e,0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46]
GF_MULT_11 = [
0x00,0x0b,0x16,0x1d,0x2c,0x27,0x3a,0x31,0x58,0x53,0x4e,0x45,0x74,0x7f,0x62,0x69,
0xb0,0xbb,0xa6,0xad,0x9c,0x97,0x8a,0x81,0xe8,0xe3,0xfe,0xf5,0xc4,0xcf,0xd2,0xd9,
0x7b,0x70,0x6d,0x66,0x57,0x5c,0x41,0x4a,0x23,0x28,0x35,0x3e,0x0f,0x04,0x19,0x12,
0xcb,0xc0,0xdd,0xd6,0xe7,0xec,0xf1,0xfa,0x93,0x98,0x85,0x8e,0xbf,0xb4,0xa9,0xa2,
0xf6,0xfd,0xe0,0xeb,0xda,0xd1,0xcc,0xc7,0xae,0xa5,0xb8,0xb3,0x82,0x89,0x94,0x9f,
0x46,0x4d,0x50,0x5b,0x6a,0x61,0x7c,0x77,0x1e,0x15,0x08,0x03,0x32,0x39,0x24,0x2f,
0x8d,0x86,0x9b,0x90,0xa1,0xaa,0xb7,0xbc,0xd5,0xde,0xc3,0xc8,0xf9,0xf2,0xef,0xe4,
0x3d,0x36,0x2b,0x20,0x11,0x1a,0x07,0x0c,0x65,0x6e,0x73,0x78,0x49,0x42,0x5f,0x54,
0xf7,0xfc,0xe1,0xea,0xdb,0xd0,0xcd,0xc6,0xaf,0xa4,0xb9,0xb2,0x83,0x88,0x95,0x9e,
0x47,0x4c,0x51,0x5a,0x6b,0x60,0x7d,0x76,0x1f,0x14,0x09,0x02,0x33,0x38,0x25,0x2e,
0x8c,0x87,0x9a,0x91,0xa0,0xab,0xb6,0xbd,0xd4,0xdf,0xc2,0xc9,0xf8,0xf3,0xee,0xe5,
0x3c,0x37,0x2a,0x21,0x10,0x1b,0x06,0x0d,0x64,0x6f,0x72,0x79,0x48,0x43,0x5e,0x55,
0x01,0x0a,0x17,0x1c,0x2d,0x26,0x3b,0x30,0x59,0x52,0x4f,0x44,0x75,0x7e,0x63,0x68,
0xb1,0xba,0xa7,0xac,0x9d,0x96,0x8b,0x80,0xe9,0xe2,0xff,0xf4,0xc5,0xce,0xd3,0xd8,
0x7a,0x71,0x6c,0x67,0x56,0x5d,0x40,0x4b,0x22,0x29,0x34,0x3f,0x0e,0x05,0x18,0x13,
0xca,0xc1,0xdc,0xd7,0xe6,0xed,0xf0,0xfb,0x92,0x99,0x84,0x8f,0xbe,0xb5,0xa8,0xa3]
GF_MULT_13 = [
0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23,0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b,
0xd0,0xdd,0xca,0xc7,0xe4,0xe9,0xfe,0xf3,0xb8,0xb5,0xa2,0xaf,0x8c,0x81,0x96,0x9b,
0xbb,0xb6,0xa1,0xac,0x8f,0x82,0x95,0x98,0xd3,0xde,0xc9,0xc4,0xe7,0xea,0xfd,0xf0,
0x6b,0x66,0x71,0x7c,0x5f,0x52,0x45,0x48,0x03,0x0e,0x19,0x14,0x37,0x3a,0x2d,0x20,
0x6d,0x60,0x77,0x7a,0x59,0x54,0x43,0x4e,0x05,0x08,0x1f,0x12,0x31,0x3c,0x2b,0x26,
0xbd,0xb0,0xa7,0xaa,0x89,0x84,0x93,0x9e,0xd5,0xd8,0xcf,0xc2,0xe1,0xec,0xfb,0xf6,
0xd6,0xdb,0xcc,0xc1,0xe2,0xef,0xf8,0xf5,0xbe,0xb3,0xa4,0xa9,0x8a,0x87,0x90,0x9d,
0x06,0x0b,0x1c,0x11,0x32,0x3f,0x28,0x25,0x6e,0x63,0x74,0x79,0x5a,0x57,0x40,0x4d,
0xda,0xd7,0xc0,0xcd,0xee,0xe3,0xf4,0xf9,0xb2,0xbf,0xa8,0xa5,0x86,0x8b,0x9c,0x91,
0x0a,0x07,0x10,0x1d,0x3e,0x33,0x24,0x29,0x62,0x6f,0x78,0x75,0x56,0x5b,0x4c,0x41,
0x61,0x6c,0x7b,0x76,0x55,0x58,0x4f,0x42,0x09,0x04,0x13,0x1e,0x3d,0x30,0x27,0x2a,
0xb1,0xbc,0xab,0xa6,0x85,0x88,0x9f,0x92,0xd9,0xd4,0xc3,0xce,0xed,0xe0,0xf7,0xfa,
0xb7,0xba,0xad,0xa0,0x83,0x8e,0x99,0x94,0xdf,0xd2,0xc5,0xc8,0xeb,0xe6,0xf1,0xfc,
0x67,0x6a,0x7d,0x70,0x53,0x5e,0x49,0x44,0x0f,0x02,0x15,0x18,0x3b,0x36,0x21,0x2c,
0x0c,0x01,0x16,0x1b,0x38,0x35,0x22,0x2f,0x64,0x69,0x7e,0x73,0x50,0x5d,0x4a,0x47,
0xdc,0xd1,0xc6,0xcb,0xe8,0xe5,0xf2,0xff,0xb4,0xb9,0xae,0xa3,0x80,0x8d,0x9a,0x97]
GF_MULT_14 = [
0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a,0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a,
0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca,0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba,
0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1,0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81,
0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11,0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61,
0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87,0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7,
0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67,0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17,
0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c,0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c,
0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc,0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc,
0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b,0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b,
0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b,0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb,
0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0,0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0,
0x7a,0x74,0x66,0x68,0x42,0x4c,0x5e,0x50,0x0a,0x04,0x16,0x18,0x32,0x3c,0x2e,0x20,
0xec,0xe2,0xf0,0xfe,0xd4,0xda,0xc8,0xc6,0x9c,0x92,0x80,0x8e,0xa4,0xaa,0xb8,0xb6,
0x0c,0x02,0x10,0x1e,0x34,0x3a,0x28,0x26,0x7c,0x72,0x60,0x6e,0x44,0x4a,0x58,0x56,
0x37,0x39,0x2b,0x25,0x0f,0x01,0x13,0x1d,0x47,0x49,0x5b,0x55,0x7f,0x71,0x63,0x6d,
0xd7,0xd9,0xcb,0xc5,0xef,0xe1,0xf3,0xfd,0xa7,0xa9,0xbb,0xb5,0x9f,0x91,0x83,0x8d]
def inv_subWord(byteArray):
res = bytearray()
for b in byteArray:
res.append( S_INV_BOX[b] )
return res
def inv_subBytes(aesState):
resState = bytearray()
for i in range(0,len(aesState),4):
resState[i:i+4] = inv_subWord(aesState[i:i+4])
return resState
def inv_shiftRow(aesState):
resState = bytearray()
"""
0 4 8 c 0 4 8 c
1 5 9 d d 1 5 9
2 6 a e -> a e 2 6
3 7 b f 7 b f 3
"""
newPosition = [ 0, 0xd, 0xa, 7,
4, 1, 0xe, 0xb,
8, 5, 2, 0xf,
0xc, 9, 6, 3
]
for i in newPosition:
resState.append(aesState[i])
return resState
def inv_mixColumn(aesState):
res = bytearray()
for i in range(0,len(aesState),4):
b0, b1, b2, b3 = aesState[i:(i+4)]
new_b0 = GF_MULT_14[b0] ^ GF_MULT_11[b1] ^ GF_MULT_13[b2] ^ GF_MULT_09[b3]
new_b1 = GF_MULT_09[b0] ^ GF_MULT_14[b1] ^ GF_MULT_11[b2] ^ GF_MULT_13[b3]
new_b2 = GF_MULT_13[b0] ^ GF_MULT_09[b1] ^ GF_MULT_14[b2] ^ GF_MULT_11[b3]
new_b3 = GF_MULT_11[b0] ^ GF_MULT_13[b1] ^ GF_MULT_09[b2] ^ GF_MULT_14[b3]
res.append(new_b0)
res.append(new_b1)
res.append(new_b2)
res.append(new_b3)
return res
def AES_Decryption(cipherText, AES_key, nbRound):
res = cipherText
res = inv_shiftRow(res)
res = inv_subBytes(res)
for i in range(nbRound-1, 0, -1):
res = inv_mixColumn(res)
res = inv_shiftRow(res)
res = inv_subBytes(res)
return res
def main():
AES_Key = None
with open(r"D:\code\ctf题目\Crypto\2021羊城杯\miss\miss-59d0d460-aa0d-45a8-b6e7-14b1b32b8a59\cipher.txt","rb") as f_in:
cipherText = f_in.read()
secondPlainText = AES_Decryption(cipherText, AES_Key,10)
print(secondPlainText)
if __name__ == '__main__':
main()
脚本只要把最后的main函数中的open改成自己的就可以
bytearray(b'SangFor{cb4_k27}')
这道题先摸了，回头在认真写
think about it
这题目前也没有找到wp
参考：
