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tea/xtea/xxtea加密算法

• 概述
• tea
• xtea
• xxtea
• 总结

概述

  这里记录一下采用python实现三种加密算法的方式，话不多说，直接上代码。

tea

from ctypes import *


def encrypt(v, k):
    v0, v1 = c_uint32(v[0]), c_uint32(v[1])
    delta = 0x9e3779b9 
    k0, k1, k2, k3 = k[0], k[1], k[2], k[3]

    total = c_uint32(0)
    for i in range(32):
        total.value += delta 
        v0.value += ((v1.value<<4) + k0) ^ (v1.value + total.value) ^ ((v1.value>>5) + k1)  
        v1.value += ((v0.value<<4) + k2) ^ (v0.value + total.value) ^ ((v0.value>>5) + k3)

    return v0.value, v1.value 


def decrypt(v, k):
    v0, v1 = c_uint32(v[0]), c_uint32(v[1])
    delta = 0x9e3779b9 
    k0, k1, k2, k3 = k[0], k[1], k[2], k[3]

    total = c_uint32(delta * 32)
    for i in range(32):                       
        v1.value -= ((v0.value<<4) + k2) ^ (v0.value + total.value) ^ ((v0.value>>5) + k3) 
        v0.value -= ((v1.value<<4) + k0) ^ (v1.value + total.value) ^ ((v1.value>>5) + k1)  
        total.value -= delta

    return v0.value, v1.value   
  

# test
if __name__ == "__main__":
    # 待加密的明文，两个32位整型，即64bit的明文数据
    value = [0x12345678, 0x78563412]
    # 四个key，每个是32bit，即密钥长度为128bit
    key = [0x1, 0x2, 0x3, 0x4]
  
    print("Data is : ", hex(value[0]), hex(value[1]))  
    res = encrypt(value, key)
    print("Encrypted data is : ", hex(res[0]), hex(res[1]))
    res = decrypt(res, key)
    print("Decrypted data is : ", hex(res[0]), hex(res[1]))
"""
Data is :  0x12345678 0x78563412
Encrypted data is :  0x9a65a69a 0x67ed00f6
Decrypted data is :  0x12345678 0x78563412
"""

xtea

from ctypes import * 


def encrypt(v, key):   
    v0, v1 = c_uint32(v[0]), c_uint32(v[1])
    delta = 0x9E3779B9

    total = c_uint32(0)
    for i in range(32):  
        v0.value += (((v1.value << 4) ^ (v1.value >> 5)) + v1.value) ^ (total.value + key[total.value & 3])
        total.value += delta 
        v1.value += (((v0.value << 4) ^ (v0.value >> 5)) + v0.value) ^ (total.value + key[(total.value>>11) & 3])

    return v0.value, v1.value 


def decrypt(v, key):
    v0, v1  = c_uint32(v[0]), c_uint32(v[1])
    delta = 0x9E3779B9
    
    total = c_uint32(delta * 32)
    for i in range(32):
        v1.value -= (((v0.value << 4) ^ (v0.value >> 5)) + v0.value) ^ (total.value + key[(total.value>>11) & 3])
        total.value -= delta 
        v0.value -= (((v1.value << 4) ^ (v1.value >> 5)) + v1.value) ^ (total.value + key[total.value & 3])

    return v0.value, v1.value 
  

# test
if __name__ == "__main__":
    # 待加密的明文，两个32位整型，即64bit的明文数据
    value = [0x12345678, 0x78563412]
    # 四个key，每个是32bit，即密钥长度为128bit
    key = [0x1, 0x2, 0x3, 0x4]

    print("Data is : ", hex(value[0]), hex(value[1]))
    res = encrypt(value, key)
    print("Encrypted data is : ", hex(res[0]), hex(res[1]))
    res = decrypt(res, key)
    print("Decrypted data is : ", hex(res[0]), hex(res[1]))
"""
Data is :  0x12345678 0x78563412
Encrypted data is :  0xae685ec7 0x59af4238
Decrypted data is :  0x12345678 0x78563412
"""

xxtea

from ctypes import *


def MX(z, y, total, key, p, e):
    temp1 = (z.value>>5 ^ y.value<<2) + (y.value>>3 ^ z.value<<4)
    temp2 = (total.value ^ y.value) + (key[(p&3) ^ e.value] ^ z.value)
    
    return c_uint32(temp1 ^ temp2)


def encrypt(n, v, key):
    delta = 0x9e3779b9 
    rounds = 6 + 52//n

    total = c_uint32(0)
    z = c_uint32(v[n-1])
    e = c_uint32(0)
    
    while rounds > 0:
        total.value += delta  
        e.value = (total.value >> 2) & 3
        for p in range(n-1):
            y = c_uint32(v[p+1])
            v[p] = c_uint32(v[p] + MX(z,y,total,key,p,e).value).value
            z.value = v[p]
        y = c_uint32(v[0])
        v[n-1] = c_uint32(v[n-1] + MX(z,y,total,key,n-1,e).value).value
        z.value = v[n-1]
        rounds -= 1 

    return v


def decrypt(n, v, key):
    delta = 0x9e3779b9
    rounds = 6 + 52//n 
    
    total = c_uint32(rounds * delta)
    y = c_uint32(v[0])
    e = c_uint32(0)

    while rounds > 0:
        e.value = (total.value >> 2) & 3
        for p in range(n-1, 0, -1):
            z = c_uint32(v[p-1])
            v[p] = c_uint32((v[p] - MX(z,y,total,key,p,e).value)).value
            y.value = v[p]
        z = c_uint32(v[n-1])  
        v[0] = c_uint32(v[0] - MX(z,y,total,key,0,e).value).value
        y.value = v[0]  
        total.value -= delta
        rounds -= 1

    return v 


#  test  
if __name__ == "__main__":
	# 该算法中每次可加密不只64bit的数据，并且加密的轮数由加密数据长度决定
    v = [0x12345678, 0x78563412]
    k = [0x1, 0x2, 0x3, 0x4]
    n = 2

    print("Data is : ", hex(v[0]), hex(v[1]))
    res = encrypt(n, v, k)
    print("Encrypted data is : ", hex(res[0]), hex(res[1]))
    res = decrypt(n, res, k)
    print("Decrypted data is : ", hex(res[0]), hex(res[1]))
"""
Data is :  0x12345678 0x78563412
Encrypted data is :  0xef86c2bb 0x25f31b5e
Decrypted data is :  0x12345678 0x78563412
"""

总结

不忘初心，砥砺前行！

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