Example introduction of M2Crypto RSA encryption and decryption-Python Tutorial-php.cn

Example introduction of M2Crypto RSA encryption and decryption

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Release： 2017-06-30 13:34:54

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M2Crypto 模块

快速安装:

# 环境centos7.0，提前装好openssl（自行百度安装），windows装不上，暂不考虑了

[root@localhost ~]# pip install m2crypto

# 验证
>>> import M2Crypto
>>>

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先做准备工作：

# centos系统上执行以下命令生成公钥和私钥

[root@localhost ~]# openssl genrsa -out key.pem 1024
[root@localhost ~]# openssl rsa -in key.pem -pubout -out pubkey.pem

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key.pem

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pubkey.pem

如何使用

1、私钥加密：

import M2Crypto
import json

# 私钥加密
def pri_encrypt(msg, file_name):
    rsa_pri = M2Crypto.RSA.load_key(file_name)          # 导入秘钥 <M2Crypto.RSA.RSA instance at 0x24da8c0>
    ctxt_pri = rsa_pri.private_encrypt(msg, M2Crypto.RSA.pkcs1_padding)   # 这里的方法选择加密填充方式，所以在解密的时候 要对应。
    print(ctxt_pri,type(ctxt_pri))
    ctxt64_pri = ctxt_pri.encode(&#39;base64&#39;)  # 密文是base64 只能写base64  方便保存 encode成str
    print (&#39;密文:%s&#39;% ctxt64_pri,type(ctxt64_pri))
    return ctxt64_pri

prikey_file = &#39;key.pem&#39;
data = {&#39;name&#39;:&#39;Jefrey&#39;}
message = json.dumps(data)

pri_encrypt(message,prikey_file)

# 打印
# ("\x8e\xc8 \x98\xea\xd5%&\xe3\xfa\xa5\xbbu];zZ\xf0\xc1\xdd\xf3\x8f\xaa\xdc\xfa\xbc\xacg\xfd\x0b3\xbba\x94K\x91ta\xda
# \xdf\xd05\xecV\xb1\xff\xf0\xc4\x07\xbf\x1c\xe0\xfc\x84&\xfcp\xf5\\\xab\xd8\xf2#\xfc\xce:]\xbae]W47\xf7\xc9\x9aXt\xff\
# xe9\xda\x19\x82\xecDP\xb2\xcb\xd3\x8d@\x81F&#39;\x9f}\xfb\x8b\xb1o>\x91\xf0G\xc36\x19Q\xf8\x7f\xaf\xbe\xa2\xee\xf0V\x88\
# xbd[\x1e3\xaf\xf0\xd3\xebu\xa9", <type &#39;str&#39;>)
# (&#39;\xe5\xaf\x86\xe6\x96\x87:jsggmOrVJSbj+qW7dV07elrwwd3zj6rc+rysZ/0LM7thlEuRdGHaIN/QNexWsf/wxAe/HOD8hCb8\ncPVcq9jyI/zO
# Ol26ZV1XNDf3yZpYdP/p2hmC7ERQssvTjUCBRiefffuLsW8+kfBHwzYZUfh/r76i\n7vBWiL1bHjOv8NPrdak=\n&#39;, <type &#39;str&#39;>)

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2、公钥解密(文件路径)：

import M2Crypto
import json

# 私钥加密
def pri_encrypt(msg, file_name):
    rsa_pri = M2Crypto.RSA.load_key(file_name)          # 导入秘钥
    ctxt_pri = rsa_pri.private_encrypt(msg, M2Crypto.RSA.pkcs1_padding)   # 进行加密 pkcs1_padding加密填充方式，解密的时候要对应。
    ctxt64_pri = ctxt_pri.encode(&#39;base64&#39;)        # 密文是base64 只能写base64  方便保存 encode成str
    print (&#39;密文:%s&#39;% ctxt64_pri,type(ctxt64_pri))
    return ctxt64_pri

# 公钥解密传入文件路径
def pub_decrypt(msg, file_name):
    rsa_pub = M2Crypto.RSA.load_pub_key(file_name)
    ctxt_pri = msg.decode("base64")     # 先将str转成base64
    maxlength = 128                      # 128位
    output = &#39;&#39;
    while ctxt_pri:
        input = ctxt_pri[:128]
        ctxt_pri = ctxt_pri[128:]
        out = rsa_pub.public_decrypt(input, M2Crypto.RSA.pkcs1_padding) #解密
        output = output + out
    print(&#39;明文:%s&#39;% output,type(output))
    print(&#39;Json:%s&#39;% json.loads(output),type(json.loads(output)))

prikey_file = &#39;key.pem&#39;
pubkey_file = &#39;pubkey.pem&#39;
data = {&#39;name&#39;:&#39;Jefrey&#39;}
message = json.dumps(data)

primsg = pri_encrypt(message,prikey_file)
pub_decrypt(primsg,pubkey_file)

# 打印
# (&#39;\xe6\x98\x8e\xe6\x96\x87:{"name": "Jefrey"}&#39;, <type &#39;str&#39;>)
# ("Json:{u&#39;name&#39;: u&#39;Jefrey&#39;}", <type &#39;dict&#39;>)

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3、公钥解密(字符串)：

import M2Crypto
import json

# 私钥加密
def pri_encrypt(msg, file_name):
    rsa_pri = M2Crypto.RSA.load_key(file_name)          # 导入秘钥
    ctxt_pri = rsa_pri.private_encrypt(msg, M2Crypto.RSA.pkcs1_padding)   # 进行加密 pkcs1_padding加密填充方式，解密的时候要对应。
    ctxt64_pri = ctxt_pri.encode(&#39;base64&#39;)        # 密文是base64 只能写base64  方便保存 encode成str
    # print (&#39;密文:%s&#39;% ctxt64_pri,type(ctxt64_pri))
    return ctxt64_pri

# 公钥解密传入字符串
def pub_decrypt(msg, pub_key):
    bio = M2Crypto.BIO.MemoryBuffer(pub_key)
    rsa_pub = M2Crypto.RSA.load_pub_key_bio(bio)
    ctxt_pri = msg.decode("base64")     # 先将str转成base64
    output = rsa_pub.public_decrypt(ctxt_pri, M2Crypto.RSA.pkcs1_padding) #解密
    print(&#39;明文:%s&#39;% output,type(output))
    print(&#39;Json:%s&#39;% json.loads(output),type(json.loads(output)))

prikey_file = &#39;key.pem&#39;
pubkey_file = &#39;pubkey.pem&#39;
data = {&#39;name&#39;:&#39;Jefrey&#39;}
message = json.dumps(data)

primsg = pri_encrypt(message,prikey_file)
with open(pubkey_file,&#39;r+&#39;) as f:
    pub_key = f.read()
pub_decrypt(primsg,pub_key)

# 打印
# (&#39;\xe6\x98\x8e\xe6\x96\x87:{"name": "Jefrey"}&#39;, <type &#39;str&#39;>)
# ("Json:{u&#39;name&#39;: u&#39;Jefrey&#39;}", <type &#39;dict&#39;>)

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小结：上面写的是私钥加密，公钥解密；反过来也一样，public_encrypt公钥加密，private_decrypt私钥解密；

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