ras 加密及解密

rsa 對數據進行加密和解密

 

#!/usr/bin/env python
# coding=utf-8

"""
pip3 install rsa
"""

import rsa
import base64

# ######### 1. 生成公鑰私鑰 #########
pub_key_obj, priv_key_obj = rsa.newkeys(1024) # 128 - 11 = 117
# 公鑰字符串
pub_key_str = pub_key_obj.save_pkcs1()
pub_key_code = base64.standard_b64encode(pub_key_str)
print(pub_key_code)
# 私鑰字符串
priv_key_str = priv_key_obj.save_pkcs1()
priv_key_code = base64.standard_b64encode(priv_key_str)
print(priv_key_code)



# # ######### 2. 用公鑰加密 #########
def encrypt(pub_key_code,value):
    """
    :param pub_key_code: 公鑰
    :param value: 要加密的數據
    :return: 成功加密的數據
    """
    key_str = base64.standard_b64decode(pub_key_code)
    pk = rsa.PublicKey.load_pkcs1(key_str)
    result = rsa.encrypt(value.encode('utf-8'), pk)
    return result

data = encrypt(pub_key_code,'liyp')
print(data)


# # ######### 3. 用私鑰解密 #########
def decrypt(priv_key_code,value):
    """
    :param priv_key_code: 私鑰
    :param value: 要解密的數據
    :return: 成功解密的數據
    """
    key_str = base64.standard_b64decode(priv_key_code)
    pk = rsa.PrivateKey.load_pkcs1(key_str)
    val = rsa.decrypt(value, pk)
    return val

origin = decrypt(priv_key_code,data)
print(origin.decode('utf-8'))

 

但是對長字符串(超過117位的字符串進行加密)就會出現異常，需要對長字符串進行切割，進行加密然后將加密的數據進行拼接。解密也是如此　

# ######### 1. 生成公鑰私鑰 #########
pub_key_obj, priv_key_obj = rsa.newkeys(1024) # 128 - 11 = 117
# 公鑰字符串
pub_key_str = pub_key_obj.save_pkcs1()
pub_key_code = base64.standard_b64encode(pub_key_str)
print(pub_key_code)
# 私鑰字符串
priv_key_str = priv_key_obj.save_pkcs1()
priv_key_code = base64.standard_b64encode(priv_key_str)
print(priv_key_code)


value = 'liyp' * 30
# # ######### 2. 用公鑰加密 #########
def big_encrypt(pub_key_code,value):
    """
    :param pub_key_code: 公鑰
    :param value: 要加密的數據
    :return: 成功加密的數據
    """
    big_list = []
    key_str = base64.standard_b64decode(pub_key_code)
    pk = rsa.PublicKey.load_pkcs1(key_str)
    for item in range(0,len(value),117):
        chunk = value[item:item+117]
        result = rsa.encrypt(chunk.encode('utf-8'), pk)
        big_list.append(result)
    return b''.join(big_list)

data = big_encrypt(pub_key_code,value)
print(data)

# ######### 3. 用私鑰解密 #########
def big_decrypt(priv_key_code,value):
    """
    :param priv_key_code: 私鑰
    :param value: 要解密的數據
    :return: 成功解密的數據
    """
    big_list = []
    key_str = base64.standard_b64decode(priv_key_code)
    pk = rsa.PrivateKey.load_pkcs1(key_str)
    for item in range(0,len(value),128):
        chunk = value[item:item+128]
        val = rsa.decrypt(chunk, pk)
        big_list.append(val)
    return b''.join(big_list)

ret = big_decrypt(priv_key_code,data)
print(ret.decode('utf-8'))