# -*- coding: utf-8 -*-
class CaesarCipher(object):
"""
凯撒加密解密
"""
def __crypt(self, char, key):
"""
对单个字母加密，偏移
@param char: {str} 单个字符
@param key: {num} 偏移量
@return: {str} 加密后的字符
"""
if not char.isalpha():
return char
else:
base = "A" if char.isupper() else "a"
return chr((ord(char) - ord(base) + key) % 26 + ord(base))
def encrypt(self, char, key):
"""
对字符加密
"""
return self.__crypt(char, key)
def decrypt(self, char, key):
"""
对字符解密
"""
return self.__crypt(char, -key)
def __crypt_text(self, func, text, key):
"""
对文本加密
@param char: {str} 文本
@param key: {num} 偏移量
@return: {str} 加密后的文本
"""
lines = []
for line in text.split("\n"):
words = []
for word in line.split(" "):
chars = []
for char in word:
chars.append(func(char, key))
words.append("".join(chars))
lines.append(" ".join(words))
return "\n".join(lines)
def encrypt_text(self, text, key):
"""
对文本加密
"""
return self.__crypt_text(self.encrypt, text, key)
def decrypt_text(self, text, key):
"""
对文本解密
"""
return self.__crypt_text(self.decrypt, text, key)
if __name__ == '__main__':
plain = """
you know? I love you!
"""
key = 3
cipher = CaesarCipher()
x =cipher.encrypt_text(plain, key)
# 加密
print(x)
# brx nqrz? L oryh brx!
# 解密
print(cipher.decrypt_text(x, key))
# you know? I love you!
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