38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
import base64
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import hashlib
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from Crypto.Cipher import AES
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from Crypto import Random
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from Crypto.Util.Padding import pad, unpad
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from codes.common import clibs
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class PassCipher:
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def __init__(self, salt):
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salt = salt.encode("utf-8")
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self.key = hashlib.sha256(salt).digest()
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def encrypt(self, plaintext):
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plaintext = plaintext.encode("utf-8")
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iv = Random.new().read(AES.block_size)
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cipher = AES.new(self.key, AES.MODE_CBC, iv)
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ciphertext = cipher.encrypt(pad(plaintext, AES.block_size))
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return base64.b64encode(iv + ciphertext).decode("utf-8")
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def decrypt(self, ciphertext):
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ciphertext = base64.b64decode(ciphertext)
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iv = ciphertext[:AES.block_size]
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ciphertext = ciphertext[AES.block_size:]
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cipher = AES.new(self.key, AES.MODE_CBC, iv)
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plaintext = unpad(cipher.decrypt(ciphertext), AES.block_size)
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return plaintext.decode("utf-8")
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@staticmethod
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def gen_salt(text: str):
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key = ""
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passwd = {idx: char for idx, char in enumerate(text * 4)}
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for idx in range(32):
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char_i = 0 if ord(passwd[idx]) - clibs.code_dict[idx] < 0 else ord(passwd[idx]) - clibs.code_dict[idx]
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key += chr(char_i)
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salt = base64.urlsafe_b64encode(key.encode()).decode()
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return salt
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