# coding:utf-8
s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
#s = "vwxrstuopq34567ABCDEFGHIJyz012PQRSTKLMNOZabcdUVWXYefghijklmn89+/"
def My_base64_encode(inputs):
# 将字符串转化为2进制
bin_str = []
for i in inputs:
x = str(bin(ord(i))).replace('0b', '')
bin_str.append('{:0>8}'.format(x))
#print(bin_str)
# 输出的字符串
outputs = ""
# 不够三倍数，需补齐的次数
nums = 0
while bin_str:
#每次取三个字符的二进制
temp_list = bin_str[:3]
if(len(temp_list) != 3):
nums = 3 - len(temp_list)
while len(temp_list) < 3:
temp_list += ['0' * 8]
temp_str = "".join(temp_list)
#print(temp_str)
# 将三个8字节的二进制转换为4个十进制
temp_str_list = []
for i in range(0,4):
temp_str_list.append(int(temp_str[i*6:(i+1)*6],2))
#print(temp_str_list)
if nums:
temp_str_list = temp_str_list[0:4 - nums]
for i in temp_str_list:
outputs += s[i]
bin_str = bin_str[3:]
outputs += nums * '='
print("Encrypted String:\n%s "%outputs)
def My_base64_decode(inputs):
# 将字符串转化为2进制
bin_str = []
for i in inputs:
if i != '=':
x = str(bin(s.index(i))).replace('0b', '')
bin_str.append('{:0>6}'.format(x))
#print(bin_str)
# 输出的字符串
outputs = ""
nums = inputs.count('=')
while bin_str:
temp_list = bin_str[:4]
temp_str = "".join(temp_list)
#print(temp_str)
# 补足8位字节
if(len(temp_str) % 8 != 0):
temp_str = temp_str[0:-1 * nums * 2]
# 将四个6字节的二进制转换为三个字符
for i in range(0,int(len(temp_str) / 8)):
outputs += chr(int(temp_str[i*8:(i+1)*8],2))
bin_str = bin_str[4:]
print("Decrypted String:\n%s "%outputs)
print()
print(" *************************************")
print(" * (1)encode (2)decode *")
print(" *************************************")
print()
num = input("Please select the operation you want to perform:\n")
if(num == "1"):
input_str = input("Please enter a string that needs to be encrypted: \n")
My_base64_encode(input_str)
else:
input_str = input("Please enter a string that needs to be decrypted: \n")
My_base64_decode(input_str)
参考资料：
python编写base64加解密脚本（可变换码表）
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