DES加解密基础实现

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DES加解密基础实现

第3章 分组密码.ppt 下载

大概就是各种乱七八糟的盒子换来换去吧。看了点别人的代码，感觉还能写。

funtion.py

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"""function"""
# 16轮
MAX_TIME = 16

# IP置换表
ip_table = [58, 50, 42, 34, 26, 18, 10, 2,
            60, 52, 44, 36, 28, 20, 12, 4,
            62, 54, 46, 38, 30, 22, 14, 6,
            64, 56, 48, 40, 32, 24, 16, 8,
            57, 49, 41, 33, 25, 17, 9, 1,
            59, 51, 43, 35, 27, 19, 11, 3,
            61, 53, 45, 37, 29, 21, 13, 5,
            63, 55, 47, 39, 31, 23, 15, 7]

# 逆IP置换表
inv_ip_table = [40, 8, 48, 16, 56, 24, 64, 32,
                39, 7, 47, 15, 55, 23, 63, 31,
                38, 6, 46, 14, 54, 22, 62, 30,
                37, 5, 45, 13, 53, 21, 61, 29,
                36, 4, 44, 12, 52, 20, 60, 28,
                35, 3, 43, 11, 51, 19, 59, 27,
                34, 2, 42, 10, 50, 18, 58, 26,
                33, 1, 41, 9, 49, 17, 57, 25]

# S盒中的S1盒
S1 = [14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7,
       0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8,
       4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0,
      15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13]

# S盒中的S2盒
S2 = [15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10,
       3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5,
       0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15,
      13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9]

# S盒中的S3盒
S3 = [10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8,
      13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1,
      13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7,
       1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12]

# S盒中的S4盒
S4 = [ 7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15,
      13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9,
      10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4,
       3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14]

# S盒中的S5盒
S5 = [ 2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9,
      14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6,
       4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14,
      11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3]

# S盒中的S6盒
S6 = [12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11,
      10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8,
       9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6,
       4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13]

# S盒中的S7盒
S7 = [ 4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1,
      13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6,
       1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2,
       6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12]

# S盒中的S8盒
S8 = [13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7,
       1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2,
       7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8,
       2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11]

# S盒
s_box = [S1, S2, S3, S4, S5, S6, S7, S8]

# 用于对数据进行扩展置换，将32bit数据扩展为48bit
extend_table = [32,  1,  2,  3,  4,  5,
                 4,  5,  6,  7,  8,  9,
                 8,  9, 10, 11, 12, 13,
                12, 13, 14, 15, 16, 17,
                16, 17, 18, 19, 20, 21,
                20, 21, 22, 23, 24, 25,
                24, 25, 26, 27, 28, 29,
                28, 29, 30, 31, 32,  1]

p_table = [16, 7, 20, 21, 29, 12, 28, 17,
            1, 15, 23, 26, 5, 18, 31, 10,
            2, 8, 24, 14, 32, 27, 3, 9,
           19, 13, 30, 6, 22, 11, 4, 25]


def hex2bin(text):
    """十六进制转二进制比特串"""
    result = []
    for i in range(len(text)):
        result.extend(int2bit(int(text[i], 16)))
    return result


def bin2hex(text):
    """二进制比特串转十六进制"""
    result = []
    q = len(text) // 4
    for i in range(q):
        dec = int(text[4 * i]) * 8 + int(text[4 * i + 1]) * 4 + \
              int(text[4 * i + 2]) * 2 + int(text[4 * i + 3]) * 1
        x = hex(dec)[2:].upper()
        result.extend(x)
    rs = ''.join(result)
    return rs

def int2bit(n):
    """0~15整数转比特"""
    a = []
    for i in range(0, 4):
        a.insert(0, str(n % 2))
        n = int(n/2)
    return a


def ip_replace(text, op):
    """IP置换部分，op为0表示正置换，op为1表示逆置换"""
    tmp = [0 for i in range(64)]
    if op == 0:
        for i in range(64):
            tmp[i] = text[ip_table[i] - 1]
        return tmp
    if op == 1:
        for i in range(64):
            tmp[i] = text[inv_ip_table[i] - 1]
        return tmp


def e_extend(text):
    """进行扩展，将32位扩展为48位"""
    extend = [0 for i in range(48)]
    for i in range(48):
        extend[i] = text[extend_table[i] - 1]
    return extend


def s_replace(text):
    """S盒变换部分"""
    s_result = [0 for k in range(32)]
    for k in range(8):
        row = 2*int(text[k*6]) + int(text[k*6+5])
        column = 8*int(text[k*6+1]) + 4*int(text[k*6+2]) + \
            2*int(text[k*6+3]) + int(text[k*6+4])
        tmp = s_box[k][row * 16 + column]
        for i in range(4):
            s_result[4 * k + i] = int2bit(tmp)[i]
    return s_result


def p_replace(text):
    """P置换部分"""
    presult = [0 for i in range(32)]
    for i in range(32):
        presult[i] = text[p_table[i] - 1]
    return presult


def xor(bit1, bit2):
    """异或运算"""
    xor_result = ['' for i in range(len(bit1))]
    for i in range(len(bit1)):
        xor_result[i] = str(int(bit1[i]) ^ int(bit2[i]))
    return xor_result

""" key_bulid : 生成密钥"""
MaxTime = 16

# 生成子密钥的置换表1，将64位的密钥转换为56位
PC_1 = [57, 49, 41, 33, 25, 17, 9,
        1, 58, 50, 42, 34, 26, 18,
        10, 2, 59, 51, 43, 35, 27,
        19, 11, 3, 60, 52, 44, 36,
        63, 55, 47, 39, 31, 23, 15,
        7, 62, 54, 46, 38, 30, 22,
        14, 6, 61, 53, 45, 37, 29,
        21, 13, 5, 28, 20, 12, 4]

# 生成子密钥的置换表2，将56位的密钥转换为48位
PC_2 = [14, 17, 11, 24, 1, 5,
        3, 28, 15, 6, 21, 10,
        23, 19, 12, 4, 26, 8,
        16, 7, 27, 20, 13, 2,
        41, 52, 31, 37, 47, 55,
        30, 40, 51, 45, 33, 48,
        44, 49, 39, 56, 34, 53,
        46, 42, 50, 36, 29, 32]


def list_move(bin_list, step):
    """将列表中的元素循环左移"""
    return bin_list[step:] + bin_list[:step]


def build(key):
    """生成子密钥"""
    key_result = []
    key0 = [0 for i in range(56)]
    for i in range(len(PC_1)):
        key0[i] = key[PC_1[i] - 1]
    for i in range(MaxTime):
        """生成16个密钥"""
        key1 = [0 for i in range(48)]
        # 确定每次左移的步数
        if i == 0 or i == 1 or i == 8 or i == 15:
            step = 1
        else:
            step = 2
        # 分成两组
        tmp1 = key0[0:28]
        tmp2 = key0[28:56]
        # 循环左移
        tmp1 = list_move(tmp1, step)
        tmp2 = list_move(tmp2, step)
        # 左右连接
        key0 = tmp1 + tmp2
        # 置换选择
        for i in range(len(PC_2)):
            key1[i] = key0[PC_2[i] - 1]
        # 生成密钥
        key_result.append(key1)
    # 返回的是一个集合包含了每次的密钥
    return key_result

encode.py

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"""encode:加密函数"""
import function as f

def encryption(text, keybit):
    """text明文,key密钥"""
    keylist = f.build(keybit)
    text1 = f.ip_replace(text, 0)  # IP置换
    L = [text1[i] for i in range(32)]
    R = [text1[i] for i in range(32, 64)]
    for i in range(16):
        tmp = R
        tmp = f.e_extend(tmp)
        tmp = f.xor(tmp, keylist[i])
        tmp = f.s_replace(tmp)
        # print("轮数:", i+1, '\t',"S盒压缩后：", "".join(tmp))
        tmp = f.p_replace(tmp)
        tmp = f.xor(tmp, L)
        L = R
        R = tmp
        # print("轮数:", i+1, '\t',"L值：", "".join(L), '\t', "，R值：", "".join(R))
    L, R = R, L
    ctext = L
    ctext.extend(R)
    ctext = f.ip_replace(ctext, 1)
    # print("\t完成inv_IP初始逆置换:","".join(ctext))
    return f.bin2hex(ctext)


# 文件作为脚本直接执行
if __name__ == '__main__':
    choose = input("请输入选择\n二进制 > 1\n十六进制 > 2\n> ")
    if choose == "1":
        plaintext = input('请输入用二进制表示的明文 \n > ')
        key = (input('请输入用二进制表示的密钥 \n > '))
        ptext = plaintext
        keybit = key
    if choose == "2":
        plaintext = input('请输入用十六进制表示的明文 \n > ')
        # key = (input("8位字符集密钥 \n >").encode().hex())
        key = (input('请输入用十六进制表示的密钥 \n > '))
        ptext = f.hex2bin(plaintext)
        keybit = f.hex2bin(key)
    # print("获取原文：","".join(ptext),"\n获取密钥：","".join(keybit))
    print('输出的密文为：' + encryption(ptext, keybit))

#  16进制明文 636f6d7075746572
#  16进制密钥 70389aec769284da
#  输出密文  2461029B5988CFB4

decode.py

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"""decode:解密函数"""
import function as f


def decryption(text, keybit):
    """
    text:明文
    key:密钥
    """
    key_list = f.build(keybit)
    text1 = f.ip_replace(text, 0)  # IP置换
    L = [text1[i] for i in range(32)]
    R = [text1[i] for i in range(32, 64)]
    for i in range(16):
        tmp = R
        tmp = f.e_extend(tmp)
        tmp = f.xor(tmp, key_list[15 - i])
        tmp = f.s_replace(tmp)
        # print("轮数:", i + 1, '\t', "S盒压缩后：", "".join(tmp))
        tmp = f.p_replace(tmp)
        tmp = f.xor(tmp, L)
        L = R
        R = tmp
        # print("轮数:", i + 1, "L值：", "".join(L), '\t', "，R值：", "".join(R))
    L, R = R, L
    ctext = L
    ctext.extend(R)
    ctext = f.ip_replace(ctext, 1)
    # print("\t完成inv_IP初始逆置换:", "".join(ctext))
    return f.bin2hex(ctext)


# 文件作为脚本直接执行
if __name__ == '__main__':
    choose = input("请输入选择\n二进制 > 1\n十六进制 > 2\n> ")
    if choose == "1":
        print("64bit的M和K")
        plaintext = input('请输入用二进制表示的密文 \n > ')
        key = (input('请输入用二进制表示的密钥 \n > '))
        ptext = plaintext
        keybit = key
    if choose == "2":
        print("64bit的C和K")
        plaintext = input('请输入用十六进制表示的密文 \n > ')
        # key = (input("8位字符集密钥 \n >").encode().hex())
        key = (input('请输入用十六进制表示的密钥 \n > '))
        ptext = f.hex2bin(plaintext)
        keybit = f.hex2bin(key)
    # print("获取密文：", "".join(ptext), "\n获取密钥：", "".join(keybit))
    print('输出的明文为：' + decryption(ptext, keybit))

#  16进制明文 636f6d7075746572
#  16进制密钥 70389aec769284da
#  输出密文  2461029B5988CFB4

en_for3.py三重DES加密

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import DES.encode as encode
import DES.decode as decode
import DES.function as f


def en_for3(plaintext: str, key1: str, key2: str) -> str:
    """
    len(str)=16,bit=16
    """
    en1 = f.hex2bin(encode.encryption(f.hex2bin(plaintext), f.hex2bin(key1)))
    de2 = f.hex2bin(decode.decryption(en1, f.hex2bin(key2)))
    en2 = encode.encryption(de2, f.hex2bin(key1))
    return en2

三重DES在后面的生成随机数需要用到。