【Python】採用rsa實現簡單的文本加密代碼

採用rsa實現簡單的文本加密代碼，思路比較簡單，直接採用rsa加密包實現，詳細代碼如下：

# coding: utf8
"""
# rsa加密算法及加解密時間統計
#2020-03-07
#Mayongdong
"""
import rsa
import datetime


def rsaEncrypt(str):
    # 生成公鑰、私鑰
    (pubkey, privkey) = rsa.newkeys(512)
    print(pubkey, privkey)
    # 明文編碼格式
    content = str.encode('utf-8')
    # 公鑰加密
    crypto = rsa.encrypt(content, pubkey)
    return (crypto, privkey)


# rsa解密
def rsaDecrypt(str, pk):
    # 私鑰解密
    content = rsa.decrypt(str, pk)
    con = content.decode('utf-8')
    return con


if __name__ == '__main__':
    # rsa加密
    startTime1 = datetime.datetime.now()
    str, pk = rsaEncrypt("人生怎能沒有挫折，有挫折戰勝它")  # 原始文
    print('加密後密文：', str)
    print(pk)
    end_time = datetime.datetime.now() - startTime1
    print("rsa_encrypt_cost_time：", end_time)

    # rsa解密
    startTime2 = datetime.datetime.now()
    content = rsaDecrypt(str, pk)
    print('解密後明文：', content)
    end_time = datetime.datetime.now() - startTime2
    print("rsa_decrypt_cost_time：", end_time)

運行結果：

PublicKey(11131718635291684274117869901086512417811976195186919753594551576361121776227962431382187081832008891400394217732815931514574474177793288106567878235695507, 65537) PrivateKey(11131718635291684274117869901086512417811976195186919753594551576361121776227962431382187081832008891400394217732815931514574474177793288106567878235695507, 65537, 9409909095551509968203152303587176525425080202227067982195372954673026626266753180099183434000578447231005187827328044517125648932297348534874846313804673, 7173012914231738958698457657873207228612981272344868111341345507151117956420389803, 1551888832265394018794725130010816643763228679549877901335773156420579769)
加密後密文： b'\x1d\x7f"\xf2`\xbb(\xdb\xf3w\x8cU\xf7\xd3\xab\x94\x1e3c\x05\x86\xfc\xfc\\\xd70\xf52\xbe\x83z\xfd\xc0\xdc\xc9{\x03\x02qxae\xb0jG\x983\xd39\x9b\xd9\x9f\x12W\xd7\xd2\x95\x8c!\xe5cz1F'
PrivateKey(11131718635291684274117869901086512417811976195186919753594551576361121776227962431382187081832008891400394217732815931514574474177793288106567878235695507, 65537, 9409909095551509968203152303587176525425080202227067982195372954673026626266753180099183434000578447231005187827328044517125648932297348534874846313804673, 7173012914231738958698457657873207228612981272344868111341345507151117956420389803, 1551888832265394018794725130010816643763228679549877901335773156420579769)
rsa_encrypt_cost_time： 0:00:00.015958
解密後明文： 人生怎能沒有挫折，有挫折戰勝它
rsa_decrypt_cost_time： 0:00:00.001995

整體來說加密是時間要長於解密時間。

rsa每次加密對文本長度有限制，不能超過53 bytes，如果超過會報錯，例如：

str, pk = rsaEncrypt("人生怎能沒有挫折，有挫折戰勝它,那才叫人生！")  # 原始文

這個文本的長度爲64 bytes，我們點擊運行後，會提示錯誤。