文件加密,好久以前一个同学让我帮他做的课题作业

wzqfwzy

时间有点久,具体的记不起来了,反正闲着也是闲着,就发出来供大家学习交流下,好像是设定一串密码,然后每位加上5形成密文,然后用密文对文件中的每个字符进行异或运算,最后形成加密文件,把加密过得文件用密文才能解密,很还念那段写py的时光.现在都没时间写了.

[Python] 纯文本查看 复制代码

# -* -coding: UTF-8 -* -
# 功能:异或方式对文件进行加密和解密
import os
import datetime


# 主函数
def main():
    while True:
        getInput()

# 输入参数
def getInput():
    # 获取操作的参数
    while (True):

        oper = input("请输入操作(e:加密 d:解密):")

        if (oper == "e" or oper == "d"):
            break
        else:
            print("输入有误，请重新输入!")

    # 获取操作的文件路径
    while (True):

        path = input("请输入文件路径（示例：C:\\test.txt）:")

        try:
            f_read = open(path, "rb")
            f_read.close()
        except:
            print("文件没有找到，请检查路径是否存在！")
        else:
            break

    # 获取文件密码
    while (True):

        password = input("请输入密码:")

        if (len(password) == 0):
            print("密码不能为空!")
            continue
        #解密时判断密码是否正确
        if oper == 'd':
            if check_pwd(path,password) == True:
                break
            else:
                print('密码不正确')
        else:
            break
    # 进行加密或解密操作
    if (oper == "e"):
        encrypt(path, password)
    elif (oper == "d"):
        decrypt(path, password)

#写入密码
def write_pwd(path,password):
    file_write = open(path,'w')
    for pwd in password:
        file_write.write(str(ord(pwd)))
    file_write.write('\n')
    file_write.close()

#验证密码
def check_pwd(path,passoord = ''):
    user_pwd = ''
    with open(path,'r') as f:
        file_pwd = f.readline()[0:-1]
    for pwd in passoord:
        user_pwd += str(ord(pwd))
    if file_pwd == user_pwd:
        return True
    return False
# 加密
def encrypt(path, password):
    start = datetime.datetime.now()
    # 因为刚学可能有库可以直接获取这些信息吧，不过自己写个算法获取这些信息也没什么难度
    fileFullName = path.split(os.path.sep)  # os.path.sep为操作系统的文件分隔符
    fileName = fileFullName[len(fileFullName) - 1].split(".")[0]
    fileSuffix = fileFullName[len(fileFullName) - 1].split(".")[1]

    # print("文件全名称:",fileFullName[len(fileFullName)-1])
    # print("文件名称:",fileName)
    # print("文件后缀:",fileSuffix)

    fileParent = path[0:len(path) - len(fileFullName[len(fileFullName) - 1])]
    newFileName = "加密_" + fileFullName[len(fileFullName) - 1]
    newFilePath = fileParent + newFileName

    tmp = password
    password = ''
    for pwd in tmp:
        password += str(int(pwd) + 5)
    # print("文件父路径:",fileParent)
    # print("新的文件名称:",newFileName)
    # print("新的文件全路径:", newFilePath)
    write_pwd(newFilePath, password)
    f_read = open(path, "rb")
    f_write = open(newFilePath, "ab")

    count = 0  # 当前密码加密索引
    # 我们采用异或循环加密
    for now in f_read:  # 通过迭代器逐行访问
        for nowByte in now:  # 通过迭代器逐字符处理
            newByte = nowByte ^ ord(password[count % len(password)])
            count += 1
            f_write.write(bytes([newByte]))

    f_read.close()
    f_write.close()
    end = datetime.datetime.now()
    print("{} --> {} 加密完成,用时 {}".format(fileFullName[-1], newFileName, end - start))


# 解密（因为我们采取的异或解密，所以其实和加密算法一样）
def decrypt(path, password):
    start = datetime.datetime.now()
    fileFullName = path.split(os.path.sep)  # os.path.sep为操作系统的文件分隔符
    fileName = fileFullName[len(fileFullName) - 1].split(".")[0]
    fileSuffix = fileFullName[len(fileFullName) - 1].split(".")[1]

    # print("文件全名称:", fileFullName[len(fileFullName)-1])
    # print("文件名称:", fileName)
    # print("文件后缀:", fileSuffix)

    fileParent = path[0:len(path) - len(fileFullName[len(fileFullName) - 1])]
    newFileName = "解密_" + fileFullName[len(fileFullName) - 1]
    newFilePath = fileParent + newFileName

    # print("文件父路径:", fileParent)
    # print("新的文件名称:", newFileName)
    # print("新的文件全路径:", newFilePath)

    f_read = open(path, "rb")
    f_write = open(newFilePath, "wb")

    count = -1  # 当前密码加密索引

    # 我们采用异或循环加密
    for now in f_read:  # 通过迭代器逐行访问
        if count == -1:
            count = 0
            continue
        for nowByte in now:  # 通过迭代器逐字符处理
            newByte = nowByte ^ ord(password[count % len(password)])
            count += 1
            f_write.write(bytes([newByte]))

    f_read.close()
    f_write.close()
    end = datetime.datetime.now()
    print('密码为: ',password)
    print('加密规则: 输入的加密密码每位加上5形成密文密码,用密文密码可以解密文件')
    print("{} --> {} 解密完成,用时 {}".format(fileFullName[-1],newFileName,end - start))


main()

523067000

感谢楼主分享！

2513002960

学习学习

ghoob321

感谢分享

Godgod

针不搓，试试

who_unknown

加密是可以加了，但解密失败了。

心乱飞林

大老没连接啊