python密码学RSA密码解密教程
时间：2022-09-17 10:28:58|栏目：Python代码|点击： 次
本章是前一章的延续，我们使用RSA算法逐步实现加密，并详细讨论它.
用于解密密文的函数是as跟随 :
def decrypt(ciphertext, priv_key): cipher = PKCS1_OAEP.new(priv_key) return cipher.decrypt(ciphertext)
对于公钥加密或非对称密钥加密，重要的是要保持两个重要的功能，即身份验证和授权.
授权
授权是确认发件人是唯一发送邮件的人的过程.以下代码解释了这个 :
def sign(message, priv_key, hashAlg="SHA-256"): global hash hash = hashAlg signer = PKCS1_v1_5.new(priv_key) if (hash == "SHA-512"): digest = SHA512.new() elif (hash == "SHA-384"): digest = SHA384.new() elif (hash == "SHA-256"): digest = SHA256.new() elif (hash == "SHA-1"): digest = SHA.new() else: digest = MD5.new() digest.update(message) return signer.sign(digest)
身份验证
身份验证可以通过验证方法解释，如下所示去;
def verify(message, signature, pub_key): signer = PKCS1_v1_5.new(pub_key) if (hash == "SHA-512"): digest = SHA512.new() elif (hash == "SHA-384"): digest = SHA384.new() elif (hash == "SHA-256"): digest = SHA256.new() elif (hash == "SHA-1"): digest = SHA.new() else: digest = MD5.new() digest.update(message) return signer.verify(digest, signature)
验证数字签名以及发件人和收件人的详细信息.为安全起见，这会增加更多的权重年龄.
RSA密码解密
您可以使用以下代码进行RSA密码解密 :
from Crypto.PublicKey import RSA from Crypto.Cipher import PKCS1_OAEP from Crypto.Signature import PKCS1_v1_5 from Crypto.Hash import SHA512, SHA384, SHA256, SHA, MD5 from Crypto import Random from base64 import b64encode, b64decode hash = "SHA-256" def newkeys(keysize): random_generator = Random.new().read key = RSA.generate(keysize, random_generator) private, public = key, key.publickey() return public, private def importKey(externKey): return RSA.importKey(externKey) def getpublickey(priv_key): return priv_key.publickey() def encrypt(message, pub_key): cipher = PKCS1_OAEP.new(pub_key) return cipher.encrypt(message) def decrypt(ciphertext, priv_key): cipher = PKCS1_OAEP.new(priv_key) return cipher.decrypt(ciphertext) def sign(message, priv_key, hashAlg = "SHA-256"): global hash hash = hashAlg signer = PKCS1_v1_5.new(priv_key) if (hash == "SHA-512"): digest = SHA512.new() elif (hash == "SHA-384"): digest = SHA384.new() elif (hash == "SHA-256"): digest = SHA256.new() elif (hash == "SHA-1"): digest = SHA.new() else: digest = MD5.new() digest.update(message) return signer.sign(digest) def verify(message, signature, pub_key): signer = PKCS1_v1_5.new(pub_key) if (hash == "SHA-512"): digest = SHA512.new() elif (hash == "SHA-384"): digest = SHA384.new() elif (hash == "SHA-256"): digest = SHA256.new() elif (hash == "SHA-1"): digest = SHA.new() else: digest = MD5.new() digest.update(message) return signer.verify(digest, signature)
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