AES對稱加解密

python實現aes對稱加解密

關於aes對稱加密的概念網上很多，在此不在贅述，直接上**。

import base64

from crypto.cipher import aes
"""aes加密解密工具類
資料塊128位
key 為16位
iv 為16位
aes加密模式為cbc
填充 pkcs7padding
"""class
myres
(object):
def__init__
(self, key)
: self.key = key
@staticmethod
defpkcs7padding
(text)
: bs = aes.block_size
length =
len(text)
bytes_length =
len(
bytes
(text, encoding=
'utf-8'))
padding_size = length if
(bytes_length == length)
else bytes_length
padding = bs - padding_size % bs
# chr(padding)看與其它語言的約定，有的會使用'\0'
padding_text =
chr(padding)
* padding
return text + padding_text
@staticmethod
defpkcs7unpadding
(text)
: length =
len(text)
unpadding =
ord(text[length-1]
)return text[
0:length-unpadding]
defencrypt
(self, content)
: key_bytes =
bytes
(self.key, encoding=
'utf-8'
) iv = key_bytes
cipher = aes.new(key_bytes, aes.mode_cbc, iv)
content_padding = self.pkcs7padding(content)
encrypt_bytes = cipher.encrypt(
bytes
(content_padding, encoding=
'utf-8'))
result =
str(base64.b64encode(encrypt_bytes)
, encoding=
'utf-8'
)return result
defdecrypt
(self, content)
: key_bytes =
bytes
(self.key, encoding=
'utf-8'
) iv = key_bytes
cipher = aes.new(key_bytes, aes.mode_cbc, iv)
encrypt_bytes = base64.b64decode(content)
decrypt_bytes = cipher.decrypt(encrypt_bytes)
result =
str(decrypt_bytes, encoding=
'utf-8'
) result = self.pkcs7unpadding(result)
return result
if __name__ ==
'__main__'
: text =
"hello world"
myrsa = myres(
"1234567890abcdef"
) encrypt_text = myrsa.encrypt(text)
print
("加密後："
, encrypt_text)
decrypt_text = myrsa.decrypt(encrypt_text)
print
("解密後："
, decrypt_text)

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