Python3非对称加密算法RSA实例详解_Python

本文实例讲述了python3非对称加密算法rsa。分享给大家供大家参考，具体如下：

python3 可以使用 crypto.publickey.rsa 和 rsa 生成公钥、私钥。

其中 python3.6 crypto 库的安装方式请参考前面一篇《python3对称加密算法aes、des3》

rsa 加解密的库使用 pip3 install rsa 就行了

c:\windows\system32>pip3 install rsa
collecting rsa
downloading https://files.pythonhosted.org/packages/e1/ae/baedc9cb175552e95f3395c43055a6a5e125ae4d48a1d7a924baca83e92e/rsa-3.4.2-py2.py3-none-any.whl (46kb)
100% |████████████████████████████████| 51kb 99kb/s
collecting pyasn1>=0.1.3 (from rsa)
downloading https://files.pythonhosted.org/packages/a0/70/2c27740f08e477499ce19eefe05dbcae6f19fdc49e9e82ce4768be0643b9/pyasn1-0.4.3-py2.py3-none-any.whl (72kb)
100% |████████████████████████████████| 81kb 289kb/s
installing collected packages: pyasn1, rsa
successfully installed pyasn1-0.4.3 rsa-3.4.2

使用 crypto.publickey.rsa 生成公钥、私钥：

				?

									import crypto.publickey.rsa

									import crypto.random

									x = crypto.publickey.rsa.generate(2048)

									a = x.exportkey("pem") # 生成私钥

									b = x.publickey().exportkey()  # 生成公钥

									with open("a.pem", "wb") as x:

									  x.write(a)

									with open("b.pem", "wb") as x:

									  x.write(b)

									y = crypto.publickey.rsa.generate(2048, crypto.random.new().read)  # 使用 crypto.random.new().read 伪随机数生成器

									c = y.exportkey()  # 生成私钥

									d = y.publickey().exportkey()  #生成公钥

									with open("c.pem", "wb") as x:

									  x.write(c)

									with open("d.pem", "wb") as x:

									  x.write(d)

使用 crypto.publickey.rsa.importkey(private_key) 生成公钥和证书：

				?

									import crypto.publickey.rsa

									with open("a.pem", "rb") as x:

									  xx = crypto.publickey.rsa.importkey(x.read())

									b = xx.publickey().exportkey()  # 生成公钥

									with open("b.pem", "wb") as x:

									  x.write(b)

									a = xx.exportkey("der")  # 生成 der 格式的证书

									with open("a.der", "wb") as x:

									  x.write(a)

使用 rsa 生成公钥、私钥：

				?

									import rsa

									f, e = rsa.newkeys(2048)  # 生成公钥、私钥

									e = e.save_pkcs1() # 保存为 .pem 格式

									with open("e.pem", "wb") as x: # 保存私钥

									  x.write(e)

									f = f.save_pkcs1() # 保存为 .pem 格式

									with open("f.pem", "wb") as x: # 保存公钥

									  x.write(f)

rsa非对称加密算法实现：

使用crypto模块：

				?

									import crypto.publickey.rsa

									import crypto.cipher.pkcs1_v1_5

									import crypto.random

									import crypto.signature.pkcs1_v1_5

									import crypto.hash

									y = b"abcdefg1234567"

									with open("b.pem", "rb") as x:

									  b = x.read()

									  cipher_public = crypto.cipher.pkcs1_v1_5.new(crypto.publickey.rsa.importkey(b))

									  cipher_text = cipher_public.encrypt(y) # 使用公钥进行加密

									with open("a.pem", "rb") as x:

									  a = x.read()

									  cipher_private = crypto.cipher.pkcs1_v1_5.new(crypto.publickey.rsa.importkey(a))

									  text = cipher_private.decrypt(cipher_text, crypto.random.new().read)  # 使用私钥进行解密

									assert text == y  # 断言验证

									with open("c.pem", "rb") as x:

									  c = x.read()

									  c_rsa = crypto.publickey.rsa.importkey(c)

									  signer = crypto.signature.pkcs1_v1_5.new(c_rsa)

									  msg_hash = crypto.hash.sha256.new()

									  msg_hash.update(y)

									  sign = signer.sign(msg_hash)  # 使用私钥进行'sha256'签名

									with open("d.pem", "rb") as x:

									  d = x.read()

									  d_rsa = crypto.publickey.rsa.importkey(d)

									  verifer = crypto.signature.pkcs1_v1_5.new(d_rsa)

									  msg_hash = crypto.hash.sha256.new()

									  msg_hash.update(y)

									  verify = verifer.verify(msg_hash, sign) # 使用公钥验证签名

									  print(verify)

运行结果：

true

使用 rsa 模块：

				?

									import rsa

									y = b"abcdefg1234567"

									with open("e.pem", "rb") as x:

									  e = x.read()

									  e = rsa.privatekey.load_pkcs1(e)  # load 私钥

									with open("f.pem", "rb") as x:

									  f = x.read()

									  f = rsa.publickey.load_pkcs1(f) # load 公钥，由于之前生成的私钥缺少'rsa'字段，故无法 load

									cipher_text = rsa.encrypt(y, f) # 使用公钥加密

									text = rsa.decrypt(cipher_text, e)  # 使用私钥解密

									assert text == y  # 断言验证

									sign = rsa.sign(y, e, "sha-256") # 使用私钥进行'sha256'签名

									verify = rsa.verify(y, sign, f) # 使用公钥验证签名

									print(verify)

运行结果：

true

希望本文所述对大家python程序设计有所帮助。

原文链接：https://blog.csdn.net/qq_42486920/article/details/80863322

Python3非对称加密算法RSA实例详解

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