python des,aes,rsa加解密的实现

aes加解密

aes 只是个基本算法，实现 aes 有几种模式，主要有 ecb、cbc、cfb 和 ofb  ctr，直接上代码，此处为aes加密中的cbc模式，ebc模式与cbc模式相比，不需要iv。

import base64from crypto.cipher import aes
from binascii import b2a_hex, a2b_hex
 
 
unpad = lambda s: s[:-ord(s[len(s) - 1:])]
class aes3:
  def __init__(self, key):
    self.key = key
    self.mode = aes.mode_cbc
    self.iv = self.key

  def _pad(self, text):
    key_len = len(self.key)
    pad = text + (key_len - len(text) % key_len) * chr(key_len - len(text) % key_len)
    return pad

  def _unpad(self, text):
    pad = ord(text[-1:])
    return text[0:-pad]

  # 加密函数
  def encrypt(self, text):
    length = 16
    count = len(text)
    if count % length != 0:
      add = length - (count % length)
    else:
      add = 0
    text = text + ('\0' * add)
    cryptor = aes.new(self.key.encode("utf8"), self.mode, self.iv.encode("utf8"))
    self.ciphertext = cryptor.encrypt(bytes(text, encoding="utf8"))
    # aes加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题，使用base64编码
    return base64.b64encode(b2a_hex(self.ciphertext)).decode('utf-8')

  # 解密函数
  def decrypt(self, text):
    decode = base64.b64decode(text)
    cryptor = aes.new(self.key.encode("utf8"), self.mode, self.iv.encode("utf8"))
    plain_text = unpad(cryptor.decrypt(decode))
    return a2b_hex(plain_text) .decode('utf8')

rsa公钥加密，私钥解密

from crypto.publickey import rsa
from crypto.cipher import pkcs1_v1_5 as cipher_pkcs1_v1_5
from crypto.signature import pkcs1_v1_5 as signature_pkcs1_v1_5
import base64

# 私钥
private_key = '''-----begin rsa private key-----
5353dfggd
-----end rsa private key-----
'''

# 公钥
public_key = '''-----begin public key-----
hfgghftetet
-----end public key-----'''
def rsa_encrypt(message):
  """校验rsa加密 使用公钥进行加密"""
  cipher = cipher_pkcs1_v1_5.new(rsa.importkey(public_key))
  cipher_text = base64.b64encode(cipher.encrypt(message.encode())).decode()
  return cipher_text


def rsa_decrypt(text):
  """校验rsa加密 使用私钥进行解密"""
  cipher = cipher_pkcs1_v1_5.new(rsa.importkey(private_key))
  retval = cipher.decrypt(base64.b64decode(text), 'error').decode('utf-8')
  return retval

des加解密

from pydes import *
import base64
class des3(object):
  def __init__(self, key, iv):
    # 这里密钥key长度必须为16/24, ,偏移量ivs
    self.key = key
    self.mode = cbc
    self.iv = iv

  # 加密函数，如果text不是16的倍数【加密文本text必须为16的倍数！】，那就补足为16的倍数
  def encrypt(self, text):
    des3 = triple_des(self.key, self.mode, self.iv, pad=none, padmode=pad_pkcs5)
    data = des3.encrypt(text)
    data = base64.b64encode(data)
    return data.decode('utf-8')

  # 解密后，去掉补足的空格用strip() 去掉
  def decrypt(self, data):
    des3 = triple_des(self.key, self.mode, self.iv, pad=none, padmode=pad_pkcs5)
    data = base64.b64decode(data)
    text = des3.decrypt(data)
    return text.decode('hex')

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